Journal articles on the topic 'ASHRAE Standard 55'

Purpose – The purpose of this paper is to adduce the most appropriate thermal comfort assessment method for determining human thermal comfort and energy efficient temperature control in office buildings in tropical West Africa. Design/methodology/approach – This paper examines the Adaptive Thermal Comfort Standard, from its research evolution to its contemporary use as an environmental design assessment Standard. It compares the adaptive component of ASHRAE Standard 55 and the European CEN/EN 15251. It begins by reviewing relevant literature and then produces a comparative analysis of the two standards, before suggesting the most appropriate Adaptive Thermal Comfort Standard for use in assessing conditions in tropical climate conditions. The suggested Standard was then used to analyse data collected from the author's pilot research into thermal conditions, in five office buildings situated in the city of Enugu, South Eastern Nigeria. Findings – The paper provides insight as to why the ASHRAE adaptive model is more suitable for thermal comfort assessment of office buildings in the tropical West African climate. This was demonstrated by using the ASHRAE Thermal Comfort Standard to assess comfort conditions from pilot research study data collected on Nigerian office buildings by the author. Originality/value – The paper compares the adaptive component of ASHRAE Standard 55 with CEN/EN 15251, and their different benefits for use in tropical climates. It suggested the need for further research studies and application of the ASHRAE Adaptive Thermal Comfort Standard in the tropical West African climate.

Dewasa ini bangunan dengan bentang lebar seperti gedung pameran, bandara, convention center, bangunan olahraga, stasiun, semakin banyak dibangun di Indonesia, sebagian besar merupakan bangunan fasilitas publik yang sangat dibutuhkan dalam menunjang aktifitas masyarakat modern. Maka bangunan jenis ini perlu dirancang dengan sebaik mungkin, diantaranya ditandai dengan kenyamanan pengguna bangunan, serta kelayakan bangunan sebagai sarana umum. Thermal performance telah menarik perhatian bagi manusia dari semenjak manusia membuat tempat penampungan pertama yang dibangun untuk melindungi kita dari cuaca, musuh alami, dan bahaya lainnya. Kemajuan lebih lanjut dalam studi tentang thermal performance terjadi bersamaan dengan pengembangan ilmu bangunan sebagai suatu disiplin ilmu, dan dengan pengenalan komputasi personal (khususnya simulasi komputer) di lapangan. Untuk mengukur thermal performance yang pada kajian ini dikhususkan pada bangunan olahraga indoor secara kredibel, harus menggunakan prosedur pengukuran performa yang terstandarisasi internasional. Standar pengukuran yang sering digunakan adalah ASHRAE standard 55. ASHRAE standard 55 ini mengidentifikasi apa saja yang harus diukur, bagaimana pengukurannya, dan seberapa sering diukur melihat kenyamanan bangunan tersebut terhadap penggunanya.

A field study of residents’ thermal comfort in a naturally ventilated intermediate single storey terrace house was carried out at Merlimau, Melaka. An intermediate single storey terrace house was chosen as a case study and indoor thermal condition measurements were recorded for three days. The indoor ambient temperature, relative humidity and air speed were measured using on-site monitoring equipment to evaluate the thermal performance of this house. A questionnaire survey was also conducted involving all occupants to determine their thermal comfort perception of the same case study house. The aim of this study is to analyse the indoor thermal condition of an intermediate single storey terrace house in order to propose architectural features to climatically adapt to the local climate. In naturally ventilated condition, results showed that this house is thermally uncomfortable and the indoor thermal condition was between 2.7°C to 5.9°C higher than suggested temperatures stipulated in ASHRAE Standard 55. Consistently, five out of eight occupants or less than 80% of occupants voted the house as thermally acceptable according to ASHRAE Standard 55.

Maintaining a satisfactory thermal environment is of primary importance, especially when the goal is to maximize learning such as in schools or universities. This paper presents a field study conducted in Milan during summer 2017 in 16 classrooms of Politecnico di Milano, including both naturally ventilated (NV) and air-conditioned (AC) environments. This study asked 985 students to report their thermal perception and their responses were evaluated according to the measured thermal comfort parameters to assess the prediction as given by Fanger and adaptive models, according to ANSI/ASHRAE 55-2017 and EN 15251:2007 standards. Furthermore, an analysis regarding potential effects of gender in comfort perception was performed. The results confirmed the fitness of Fanger’s model for the prediction of occupants’ thermal sensations in AC classrooms with a reasonable accuracy. In NV classrooms, the Adaptive model was proven to be suitable for predicting students’ comfort zone according to ASHRAE 55 Standard, while the adaptive comfort temperatures recommended by EN 15251 were not acceptable for a large number of students. No significant differences in thermal comfort perception between genders have been observed, except for two NV classrooms in which females’ thermal sensation votes had resulted closer to neutrality in comparison to males, who expressed a warmer thermal sensation.

Elevated CO2 rates in a building affect the health of the occupant. This paper deals with an experimental and numerical analysis conducted in a full-scale test room located in the Department of Mechanical Engineering at the University of Technology. The experiments and CFD were conducted for analyzing ventilation performance. It is a study on the effect of the discharge airflow rate of the ceiling type air-conditioner on ventilation performance in the lecture room with the mixing ventilation. Most obtained findings show that database and questionnaires analyzed prefer heights between 0.2 m to 1.2 m in the middle of an occupied zone and breathing zone height of between 0.75 m to 1.8 given in the literature surveyed. It is noticed the mismatch of internal conditions with thermal comfort, and indoor air quality recommended by [ASHRAE Standard 62, ANSI / ASHRAE Standard 55-2010]. CFD simulations have been carried to provide insights on the indoor air quality and comfort conditions throughout the classroom. Particle concentrations, thermal conditions, and modified ventilation system solutions are reported.

The most recent review of the ASHRAE Standard 55 (2010) incorporates the dialectic between static and adaptive approaches to thermal comfort by proposing different recommendations for airconditioned and naturally ventilated buildings. Particularly in naturally ventilated buildings, this standard aligns with three important topics in research field of thermal comfort during the last decades: (i) air movement enhancement versus draft, (ii) control availability and its impact on occupants' satisfaction, and (iii) the search for thermal pleasure. This paper presents the rationale behind these three research topics and discusses its positive influence when moving from thermal comfort towards thermal pleasure.

Low-temperature radiant heating systems can be considered as suitable candidates for the refurbishment of old heating systems. These systems are proven to save energy, however, their drawback is their impact on the creation of radiant temperature asymmetry and local thermal discomfort, especially in old buildings where the temperatures of surfaces (for example external walls with a low level of insulation and large windows) are low. This study aims to evaluate the potential application of low-temperature radiant ceiling heating systems (28–38 °C) in old and energy-renovated buildings, based on subjective experiments and thermal comfort criteria such as thermal sensation, comfort, satisfaction, and sensation asymmetry votes. Later, in the Discussion section, the guideline for the radiant temperature asymmetry for the warm ceiling presented in ASHRAE Standard-55 is corrected for relatively low air temperatures and different surface temperatures corresponding to “about neutral” conditions for winter clothing. Findings of this research show that the radiant ceiling heating system operating at low temperatures (33–38 °C) can provide fairly neutral thermal sensation and satisfactory comfort at the majority of body-parts, if the building envelope satisfies advanced building energy-efficiency regulations. Additionally, the experimental analyses imply that limitation of 5% suggested by ASHRAE-55 for the percentage of dissatisfied occupants feeling uncomfortable due to overhead radiation can be elevated to 10%.

The analysis and modeling of unconventional thermal zones is a first step for the inclusion of low-cost spaces and for the assessment of the environmental impact among areas of human use in warm climates. In this paper, the heat transfer in a geodesic dome located at the University of Magdalena (Colombia) is modeled and simulated. The simulator is calibrated against experimental measurements and used to study the effect of different loads which are regulated by a controller in sliding modes explicitly designed for this case. The closed-loop system is used together with ASHRAE Standard 55 to characterize comfort conditions within the dome and the effect on the overall thermal sensation with increasing the number of occupants.

The paper presents the integrated application of two methods during testing HVAC system efficiency in the cabins of HUMMER ?1151A1 and OAR 1RL-128D off-road vehicles. Spatial measurements of change in air temperature per time have been performed at three vertical levels (head, knees and feet) of the driver and passengers, which totals to 15 measuring points per vehicle. The main goal of testing was to evaluate accurately the efficiency of heating and cooling in relation to time interval required to attain a designed temperature of comfort in the vehicle cabin, on condition that the difference in ambient temperature levels does not exceed 10?C. With a view to more efficient evaluation of thermal comfort in vehicle cabins, the testing was performed also of Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD) indices. Standard thermal comfort surveys ask subjects about their thermal sensation on a seven-point scale from cold (-3) to hot (+3). This research is carried out according to the methods based on ISO 7730, ASHRAE 55 and SORS 8419 standards.

Building simulation is a powerful way to evaluate the performance of a building. The quality of simulation results however strongly depends on the accuracy of simulation input data. Especially for weather data files and occupant behaviour it is difficult to obtain accurate data. This paper evaluates the variability of building simulation results with regards to different weather data sets as well as different heating and cooling set points for a residential building in Victoria, Australia. Thermal comfort according to ASHRAE Standard 55, final energy consumption and peak cooling and heating loads are assessed. Simulations have been performed with Energy-Plus, and weather data for a multi-year approach have been generated with the software Meteonorm. The results show that different weather files for the same location as well as different conditioning set points can influence the results by approximately a factor of 2.

The hospital street is widely utilized in the modern health care facilities as a main traffic streamline to connecting all of the outpatient rooms and treatment departments for easy access. This study investigate the indoor environment quality of a typical hospital street, i.e., a high space atrium with ETFE membrane structure in the top. The investigation combines the on-site measurement and subjective survey. The results indicates that the indoor air temperature in the atrium reaches up to 32.6oC in a summer day causing thermal discomfort according to ASHRAE 55. The CO2, PM2.5, TVOC concentration in the hospital street comply with the Chinese standard for hospitals. The illumination in the corridors around the atrium is below the threshold of Chinese standard, i.e., 100 lux. Due to the vibration of the light ETFE membrane structure, the noise level in rainy days is as high as 79.5 dB which causes acoustic discomfort of occupants. This study is beneficial for the design of the hospital street design with the ETFE membrane structure.

The neutral thermal sensation (neither cold, nor hot) is widely used through the application of the ASHRAE seven-point thermal sensation scale to assess thermal comfort. This study investigated the application of the neutral thermal sensation and it questions the reliability of any study that solely relies on neutral thermal sensation. Although thermal-neutrality has already been questioned, still most thermal comfort studies only use this measure to assess thermal comfort of the occupants. In this study, the connection of the occupant’s thermal comfort with thermal-neutrality was investigated in two separate contexts of Norwegian and British offices. Overall, the thermal environment of four office buildings was evaluated and 313 responses (three times a day) to thermal sensation, thermal preference, comfort, and satisfaction were recorded. The results suggested that 36% of the occupants did not want to feel neutral and they considered thermal sensations other than neutral as their comfort condition. Also, in order to feel comfortable, respondents reported wanting to feel different thermal sensations at different times of the day suggesting that occupant desire for thermal comfort conditions may not be as steady as anticipated. This study recommends that other measures are required to assess human thermal comfort, such as thermal preference. Practical application: This study questions the application of neutral thermal sensation as the measure of thermal comfort. The findings indicate that occupant may consider other sensations than neutral as comfortable. This finding directly questions the standard comfort zone (e.g. ASHRAE Standard 55) as well as the optimum temperature, as many occupants required different thermal sensations at different times of the day to feel comfortable. These findings suggest that a steady indoor thermal environment does not guarantee thermal comfort and variations in the room temperature, which can be controlled by the occupant, need to be considered as part of the building design.

Alkali-activated materials (AAM) compared to Portland cement (PC) may significantly reduce the carbon dioxide emissions, as well as the consumption of non-renewable natural resources in civil engineering applications. Further environmental advantages are possible if natural aggregates used for mortars and concretes are replaced with residues and wastes from industrial or mining activities. This paper compares the performance of PC with AAM as binders in cementitious wall panels for external cladding in hot and humid climate. Three different cementitious matrices are proposed, consisting of either 100% Portland cement (PC), 100% alkali-activated metakaolin (MK) or 80/20 alkali-activated Metakaolin/Blastfurnace slag (80/20 MK/BFS). Mortars were produced with the addition of tailing from iron-ore mining activities in the state of Minas Gerais, Brazil, at an aggregate to binder ratio of 1.0 for all matrices. The thermal property determined for the three mortars was Thermal Conductivity using a heat flow meter (HFM) apparatus according to ISO 8301 (1999); their apparent density was also measured. After that, one-story house building simulation was carried out using the Energy Plus Software. The main room annual operative temperature provided by different panels used as cladding was compared to the adaptive comfort range established on ASHRAE Standard 55/2013 for a Brazilian and Portuguese hot and humid climate. According to the Climate Zone Definitions of ANSI/ASHRAE Standard 169/2006, Belo Horizonte (Brazil) and Funchal (Portugal) were selected as a sample of 2A zone that presents a hot and humid climate. Partial results of this research were presented in this paper. Results show that building simulations can effectively contribute to validate the selection of materials in the production of sustainable wall panels that provide suitable thermal conditions to the users in hot and humid climate.

The analysis of thermal comfort in buildings, energy consumption, and occupant satisfaction is crucial to influencing the architectural design methodologies of the future. However, research in these fields in developing countries is sectorised. Most times, the standards to study and assess thermal comfort such as ASHRAE Standard 55, EN 15251, and ISO 7730 are insufficient and not appropriate for the geographical areas of application. This article presents a scoping review of published work in Colombia, as a representative case study, to highlight the state-of-the-art, research trends, gaps, and potential areas for further development. It examines the amount, origin, extent, and content of research and peer-reviewed documentation over the last decades. The findings allow new insights regarding the preferred models and the evaluation tools that have been used to date and that are recommended to use in the future. It also includes additional information regarding the most and least studied regions, cities, and climates in the country. This work could be of interest for the academic community and policymakers in the areas related to indoor and urban climate management and energy efficiency.

Thermal comfort in the built environment is one of the most defining parameters influencing energy use, environmental quality, and occupant satisfaction. Unfortunately, there is a lack of research in this area within developing countries, which are becoming increasingly urbanised and where mechanical air conditioning demands are rising. Many of these countries are adopting thermal comfort standards such as the ASHRAE Standard 55, the EN 15251, and the ISO 7730 to regulate the use of air-conditioning; even when these standards have been widely criticised for their inadequacy within geographical regions different to the ones that they were designed for. Research suggests the need to confirm these models through further post-occupancy studies and fieldwork. Deficiencies in data collection and methodologies are thought to require particular attention to develop algorithms that can predict thermal comfort levels accurately. Comprehensive strategies considering interrelated psychological, physiological and social factors are needed. This manuscript highlights gaps of research, specifically within tropical developing countries, through the analysis of Colombia as a case study. It emphasises the importance of standardised fieldwork data and gives examples of alternative collection systems. This aims to contribute to the understanding of occupant´s adaptive behaviours and their impact on the mitigation of climate change.

Air conditioning for buses is an important incentive tool for the public transport, since it offers comfort to passengers and stimulates the use of this kind of transport which is fundamental to improve urban mobility. Currently, air conditioning equipment for buses is the mechanical vapor compression (MVC) type. However, this kind of system has two main disadvantages: the high financial cost and power consumption by the vehicle engine. The purpose of this study is to develop an evaporative cooler for buses, which is a simple, environmental friendly, low-cost solution that does not use engine power for its operation. The first step was the design and construction of the prototype. The following step was to evaluate the built prototype through performing experimental tests. The prototype presented a saturation efficiency of approximately 70%, airflow rate of 421.5 m³/h and energy consumption of 98.4 W. After determining the prototype technical characteristics, the evaporative cooling system was developed for an urban bus, seeking to meet the air renewal required by ANSI/ASHRAE standard 62.1 and to promote the passenger’s thermal comfort as specified by ISO 7730 and ANSI/ASHRAE Standard 55. The thermal comfort provided by the new cooling system was evaluated through the PMV-PPD indexes. A value of 0.35 was obtained for the PMV index and the PPD index obtained a value of 7, indicating that approximately 93% of the passengers will be satisfied regarding their thermal comfort for the established environmental conditions. The evaporative cooling system had a total energy consumption of approximately 0.4 kW, which represents only 5% of the energy that would be consumed by a MVC system. Therefore, the evaporative cooling performance depends on the climatic conditions of the environment, especially humidity. However, when applied in favorable conditions (low humidity), the evaporative cooling system proved to be a viable solution to replace the MVC systems in buses air-conditioning application, where its main advantage is its positive cost-benefit and energy savings.

The study of thermal comfort in buildings is required to maintain a stable and comfortable condition of the indoor environment. The climate chamber study used to determine thermal comfort is mathematically reproducible and robust, but exaggerative and hence is energy inefficient, whereas the adaptive model-based field survey method is exhaustive and bioclimatic specific. Although, several field survey-based thermal comfort studies have been reported from India, these studies were conducted mostly either in hot and humid or composite climatic condition, and very few research has been reported from cold climatic region, which lies mostly along the high altitudinal Himalayan region. In this paper, the results of field survey-based thermal comfort studies in residential houses of highly altitudinal Darjeeling Himalayan region in eastern India are presented. The study found that female subjects showed a lesser clothing cover but portrayed a higher discomfort with lower thermal sensation and higher comfort temperature. The comfort temperature as determined in this study did not comply with the ASHRAE standard 55 graphical method, and hence new comfort zone for regions with similar cold climate is proposed.

Resumo Tetos-reservatório (TR) podem colaborar para obtenção de condições térmicas confortáveis, particularmente em edificações térreas. Possibilitam resfriamento ou aquecimento estrutural e estabilização das temperaturas superficiais e do ar. Uma alternativa para melhorar o desempenho do TR é acoplá-lo a painéis radiantes. Atualmente, há escassez de pesquisas enfocando a percepção térmica de usuários em ambientes fechados condicionados por TR. O objetivo desta pesquisa foi verificar, empiricamente, para condições de verão, a percepção térmica de voluntários em um ambiente condicionado por painéis radiantes acoplados a TR. Buscou-se também identificar qual modelo adaptativo melhor representaria os votos declarados pelos participantes do estudo. Como parâmetros para análise das percepções térmicas reportadas, adotaram-se o modelo PMV e os modelos para edificações passivas das normas Standard 55 e EN 15251. O experimento ocorreu em uma edificação-teste da Ben-Gurion University of Negev, em Israel. Foram consideradas respostas de 46 voluntários. O ambiente dotado de TR foi percebido como confortável pela maior parte dos voluntários. As respostas subjetivas apresentaram maior concordância com os modelos PMV e da EN 15251 do que com o modelo da ASHRAE.

The study reported herein builds on occupant response to an intermittent air jet strategy (IAJS), which creates periodic airflow and non-isothermal conditions in the occupied zone. Previous research has highlighted benefits of IAJS for the thermal climate and energy saving potential in view of human thermal perception of the indoor environment. The study herein explores the occupant acceptability of air movements and perceived indoor air quality. Thirty-six participants were exposed to three room air temperatures (nominal: 22.5℃, 25.5℃ and 28.5℃) with each having four air speed conditions (nominal: < 0.15 m/s under mixing ventilation (MV) and 0.4, 0.6 and 0.8 m/s under IAJS) measured at the breathing height (1.1 m). The results show that participants preferred low air movements at lower temperatures and high air movements at higher temperatures. A model to predict percentage satisfied with intermittent air movements was developed. The model predicts that 87% of occupants, in compliance with ASHRAE 55-2013 standard, will find intermittent air movements acceptable between 23.7℃ and 29.1℃ within an air speed range of 0.4 to 0.8 m/s. IAJS also improved participants' perception of air quality in conditions deemed poor under MV. The findings support the potential of IAJS as a primary ventilation system in high occupant spaces such as classrooms.

Na versão de 2010, os Requisitos Técnicos da Qualidade do Nível de Eficiência Energética de Edifícios Comerciais de Serviços e Públicos (RTQ-C) apresentam características para avaliação que não foram quantificadas, tendo sido desenvolvidas conceitualmente. O objetivo deste artigo é avaliar esses impactos por meio da simulação de um edifício naturalmente condicionado, utilizado para esta pesquisa, com a aplicação de medidas de conservação de energia: parede envidraçada com câmara de ar e alvenaria, brises triangulares, brises horizontais paralelos à fachada, aberturas zenitais, absortância das paredes externas, todos comparados com um caso-base, um edifício sem proteções solares. A simulação no EnergyPlus forneceu temperaturas operativas cujos limites de conforto foram determinados de acordo com a ASHRAE Standard 55. O caso-base apresentou nível de eficiência B, e a alternativa com parede envidraçada com câmara de ar e alvenaria, com fator solar de 0,83, apresentou nível de eficiência A; todas as demais apresentaram nível de eficiência B, devido ao desconforto por frio na zona bioclimática 3. A alternativa com brises horizontais paralelos à fachada, com aletas de 25 cm, apresentou o menor equivalente numérico. Percebeu-se a necessidade de mensuração de variáveis similares em outros modelos de edifícios naturalmente condicionados e para outras localidades pertencentes à zona bioclimática, a fim de confirmar as potencialidades e limitações de tais medidas no RTQ-C.

The hygro-thermal comfort (ICQ) is defined as the psychophysical state in which the subject expresses a condition of well-being with respect to environmental variables, a condition known as thermal neutrality. Furthermore, the ICQ represents one pillar of the holistic concept of the Indoor Environmental Quality (IEQ). The methods for the assessment of ICQ and recognized at international level are mainly two. The former, based on a steady-state approach, described by the EN ISO 7730:2005 and applied to Fully Mechanically Controlled buildings (FMC) equipped with an active conditioning system. The latter, based on an adaptive approach, as defined trough in field activities and described by the technical standard ASHRAE 55 and EN 15,251, instead, considers the users as active subjects that interact with surrounding environment and are influenced in their comfort perception by external conditions. In this case, the thermal comfort concept is not just defined depending on physical, but also psychological, social, economic and cultural aspects. The technical standards provides that this method could be applied in middle seasons when the control of comfort is handled by passive technological methods, i.e., in the so called Natural Ventilated or Free Running buildings (FR). In this approach, methodologies providing the direct involvement of the end user are consolidating, through the collection of physiological, psychological and behavioral personal data as to obtain the better assessment of the comfort conditions. Placing in this field, the article describes the results of a field investigation in an office aimed at defining a framework for the assessment of the thermal comfort based on the two approaches through the use of low cost technology solutions, parametric and freeware models.

Large glass areas, even high-performance glazing with Low-E coating, could lead to discomfort if exposed to solar radiation due to radiant asymmetry. In addition, air-to-air cooling systems affect the thermal environment indoors. Water-Flow Glazing (WFG) is a disruptive technology that enables architects and engineers to design transparent and translucent facades with new features, such as energy management. Water modifies the thermal behavior of glass envelopes, the spectral distribution of solar radiation, the non-uniform nature of radiation absorption, and the diffusion of heat by conduction across the glass pane. The main goal of this article was to assess energy consumption and comfort conditions in office spaces with a large glass area by using WFG as a radiant heating and cooling system. This article evaluates the design and operation of an energy management system coupled with WFG throughout a year in an actual office space. Temperature, relative humidity, and solar radiation sensors were connected to a control unit that actuated the different devices to keep comfortable conditions with minimum energy consumption. The results in summer conditions revealed that if the mean radiant temperature ranged from 19.3 to 23 °C, it helped reduce the operative temperature to comfortable levels when the indoor air temperature was between 25 and 27.5 °C. The Predicted Mean Vote in summer conditions was between 0 and −0.5 in working hours, within the recommended values of ASHRAE-55 standard.

The deployment of containers as building modules has grown in popularity over the past years due to their inherent strength, modular construction, and relatively low cost. The upcycled container architecture is being accepted since it is more eco-friendly than using the traditional building materials with intensive carbon footprint. Moreover, owing to the unquestionable urgency of climate change, existing climate-adaptive design strategies may no longer respond effectively as they are supposed to work in the previous passive design. Therefore, this paper explores the conceptual design for an upcycled shipping container building, which is designed as a carbon-smart modular living solution to a single family house under three design scenarios, related to cold, temperate, and hot–humid climatic zones, respectively. The extra feature of future climate adaption has been added by assessing the projected future climate data with the ASHRAE Standard 55 and Current Handbook of Fundamentals Comfort Model. Compared with the conventional design, Rome would gradually face more failures in conventional climate-adaptive design measures in the coming 60 years, as the growing trends in both cooling and dehumidification demand. Consequently, the appropriate utilization of internal heat gains are proposed to be the most promising measure, followed by the measure of windows sun shading and passive solar direct gain by using low mass, in the upcoming future in Rome. Future climate projection further shows different results in Berlin and Stockholm, where the special attention is around the occasional overheating risk towards the design goal of future thermal comfort.

O Programa Proinfância, criado para suprir o déficit de vagas em pré-escolas, apresenta projetos padrão para facilitar processos de licitações e sua implementação nos municípios brasileiros. O Manual de Orientações Técnicas do Programa exige que os projetos cumpram o nível Mínimo de desempenho térmico para inverno e o nível Intermediário para verão, de acordo com o método de simulação da NBR 15.575:2013. Entretanto, o Manual não correlaciona os níveis de desempenho térmico com temperaturas de conforto térmico adequadas ao desenvolvimento das atividades escolares. Dessa maneira, este trabalho analisa a adequação do método de avaliação térmica das pré-escolas proposto pelo Manual, correlacionando os níveis de desempenho térmico alcançados por um projeto padrão com temperaturas de conforto térmico nas 8 zonas bioclimáticas definidas pela NBR 15.220:2005. O desempenho térmico foi avaliado pelo método de simulação da NBR 15.575:2013, enquanto o conforto térmico foi analisado de acordo com o modelo adaptativo da ASHRAE Standard 55-2017. Adaptações ao método de simulação tiveram que ser feitas para a avaliação do desempenho térmico da pré-escola, já que a NBR 15.575 contempla somente edificações residenciais, deixando lacunas a serem preenchidas. Verificou-se que os parâmetros não definidos na Norma de Desempenho e no Manual do programa podem alterar a classificação de desempenho térmico do projeto. Além disso, temperaturas resultantes da avaliação de desempenho térmico extrapolam significantemente os níveis de conforto térmico, ainda que alcançando classificações aceitas pelo Manual do Proinfância. Este estudo ressalta a importância do desenvolvimento de normativa específica de conforto térmico para tipologias escolares.

This research aims to determine thermal conditions and sensation of thermal comfort in classrooms of high schools in Padang. This study was conducted in 11 State Senior High School (SMA) represented 11 districts in Padang. About 10% of total student body in each schools were participated in this study to vote thermal comfort questioners. To determine thermal comfort level in this study, PMV (Predicted mean Vote) and PPD (Predicted Percentage of dissatisfied) method were used according to standard of thermal comfort in ASHRAE 55-2005 and ISO 7730. PMV method is used to determine scope of situation in the environment that scaled from +3 for very hot until -3 for very cold, and PPD is a method to calculate the number of human (in percentage) dissatisfied with the environment. Calculated PMV and PPD were compared with PMV and PPD resulted from individual vote from questionnaires. Result showed that in general, thermal conditions in classrooms had air temperature and radiant temperature from 27oC – 30oC, air humidity from 68% - 80%, and wind speed of 0 m/s. Calculated PMV from this condition were ranging from +1 slightly warm) until +2 (warm) while PPD calculated greater than 20%. Compared with calculated PMV and PPD values, the individual vote showed values from +0,5 (neutral) until +1 (slightly warm) while PPD values of individual vote greater than 20% except for SMA 2 and SMA 11 Padang. It is concluded that improvements of indoor thermal conditions have to make inside classrooms as well as landscape outside in order to improve thermal comfort level of students during learning and teaching.Keywords: Thermal Comfort, PMV (Predicted Mean Vote), PPD (Predicted Percentage ofDissatisfied), climatic factors, SMA

The energy efficiency improvements in existing buildings have become priority concerns of the European Union to encourage energy efficiency amongst residents and buildings as well as facility managers. The characterisation of the building stock plays an important role in the definition of energy renovation strategies. In Portugal, there are over 120,000 social housing flats. This paper focused on the holistic characterisation of a social housing neighbourhood concerning the “in situ” assessment of the indoor environmental conditions and thermal comfort over one year as well as air permeability tests of the flats and evaluation of the energy consumption. The hygrothermal monitoring campaign was carried out using thermo-hygrometer sensors to record the indoor air temperature and relative humidity of a large number of flats over a 12-month period. The airtightness of these flats was determined resourcing fan pressurisation test (blower door test). A relationship between the users’ modifications in the flats and their consequence over the air permeability was pursued and the importance of balconies and exhaust fans for the flats’ air permeability was discussed. The hygrothermal monitoring campaign of the case study was carried out, in order to assess the indoor thermal comfort according the ASHRAE 55 standard. The results show a significant discomfort rate, suggesting that the users are living in unhealthy environmental conditions and the issues that most contribute to the poor indoor environmental conditions that characterise this building stock. In addition, the energy, gas, and water consumption of the flats were collected, and a statistical analysis was performed. Correlations between the variables were observed and two clusters were identified. Cluster 1 includes the lower energy consumption flats, but no real impact on the thermal comfort was found as the entire dataset presented low indoor air temperatures.

Large-surface radiant heating ceiling systems favor energy-efficient solutions on the heat generation side because of the relatively low temperature of the heat transfer medium. Additionally, their application in the renovation of existing buildings is relatively uncomplicated and requires minimal changes to the building’s construction. However, ASHRAE Standard-55 and former studies by Fanger indicated that among large-surface radiant systems, the highest percentage of dissatisfaction for an equal radiant temperature asymmetry (RTA) was reported for a warm ceiling. The maximum RTA of 4 K corresponding to 5% of dissatisfaction was suggested. In the first part of our study (subjective experiments), we have suggested the RTA of about 7.4 K if occupants have winter clothing (Safizadeh et al., 2018). However, former studies tested radiant ceiling systems at different temperatures in “neutral conditions” with a constant operative temperature, which rarely occurs in reality. Accordingly, the goal of this study is to evaluate the potential application of low-temperature radiant heating ceilings in a building with low- and high-performance facades using steady-state simulations with a coupled CFD–thermal comfort model and transient simulations using TRNSYS. Forty combinations of simulation scenarios including six ceiling surface temperatures (20 °C, 25 °C, 28 °C, 33 °C, 38 °C, and 45 °C), two low- and high-performance facades, two rooms with one and two facades, and distances of 1 m and 3 m to the window were examined. The findings of this research show that the supply water temperatures between 28–45 °C from a heat pump are ideal for a building with a high-performance façade. Additionally, the results suggest that ceiling temperatures as low as 20–25 °C in renovated buildings and 25–28 °C in a building with low-performance facades can provide optimal thermal sensations at most body parts. This study also proves that the PMV comfort model (Predicted Mean Vote index) is not at all a suitable model for the evaluation of radiant heating systems (especially if occupants have winter clothes), even if the air/operative temperature distribution near an occupant is uniform.

This paper presents the part of the research that has been done at the Universities both in Belgrade and Thessaloniki, Greece, taking into account indoor environmental quality in office buildings and classrooms. The measurements that are presented were done in Process Equipment Design Laboratory at Aristotle University Thessaloniki, during March 2015. Indoor environmental quality regarding air temperature, relative humidity, and CO2 concentration in two representative offices is observed. The similar offices are located one on the north-east and the other one on the south-west side of the University building, so as to be representative of the orientation?s impact. Furthermore, the impact of natural ventilation on CO2 concentration and temperature is monitored, together with the offices? occupancy. Recommended parameters for indoor air quality are compared and discussed on the base of several standards: SRPS EN 15251:2010, ASHRAE standards 55 and 62.1, and ISO 7730. The main objectives, as set from these standards are discussed, together with the investigation results.

This paper presents an integrated experimental study of the thermal comfort in a Closed Air Conditioned ICT Laboratory at Ungku Omar Polytechnic, Malaysia. The aim of this study is to determine the level of thermal comfort in the ICT laboratory by using the Thermal Confort Measurement (TCM) equipment. The ICT laboratory is considered as an indoor environment and this study had been carried out by the use of the custom made TCM from 8.30 am till 4.30 pm. This TCM is able to investigate the level of thermal in this laboratory in aspects of the level of carbon dioxide (CO2), humidity, wind speed, ambient temperature, and globe temperature simultaneously. All the data were then compared to the standards or guidelines produced by National Institue Of Safety and Health of Malaysia (NIOSH), American Conference of Governmental Industrial Hygienists (ACGIH) and the American Standards of Heating Refrigeration and Air Conditioning Engineers (ASHRAE 55), which is currently being practiced in Malaysia. From the study that was carried out it was revealed that the level of CO2 in the ICT Laboratory exceeded the hazardous level thus can produce the negative impact to the productivity of the end user which are the student that will be using this laboratory.

Abstract Thermal insulation from clothing is one of the most important input variables used to predict the thermal comfort of a building's occupants. This paper investigates the clothing pattern in buildings with different configurations located in a temperate and humid climate in Brazil. Occupants of two kinds of buildings (three offices and two university classrooms) assessed their thermal environment through 'right-here-right-now' questionnaires, while at the same time indoor climatic measurements were carried out in situ (air temperature and radiant temperature, air speed and humidity). A total of 5,036 votes from 1,161 occupants were collected. Results suggest that the clothing values adopted by occupants inside buildings were influenced by: 1) climate and seasons of the year; 2) different configurations and indoor thermal conditions; and 3) occupants' age and gender. Significant intergenerational and gender differences were found, which might be explained by differences in metabolic rates and fashion. The results also indicate that there is a great opportunity to exceed the clothing interval of the thermal comfort zones proposed by international standards such as ASHRAE 55 (2013) - 0.5 to 1.0 clo - and thereby save energy from cooling and heating systems, without compromising the occupants' indoor thermal comfort.

Comfort analysis of existing naturally ventilated buildings located in mild climates, such as the ones in the Mediterranean zones, offer room for a reduction in the present and future energy consumption. Regarding Spain, most of the present building stock was built before energy standards were mandatory, let alone considerations about global warming or adaptive comfort. In this context, this research aims at assessing adaptive thermal comfort of inhabitants of extant apartments building in the South of Spain per EN 15251:2007 and ASHRAE 55-2013. The case study is statistically representative housing built in 1973. On-site monitoring of comfort conditions and computer simulations for present conditions have been carried out, clarifying the degree of adaptive comfort at present time. After that, additional simulations for 2020, 2050, and 2080 are performed to check whether this dwelling will be able to provide comfort considering a change in climate conditions. As a result, the study concludes that levels of adaptive comfort can be considered satisfactory at present time in these dwellings, but not in the future, when discomfort associated with hot conditions will be recurrent. These results provide a hint to foresee how extant dwellings, and also dwellers, should adapt to a change in environmental conditions.

Abstract Thermal comfort is the main driver of buildings energy consumption; it has been classified by building occupants to be of greater importance compared with visual and acoustic comfort. To respond correctly and quickly to the increase in energy price and pollution, thermal regulations and comfort approaches have emerged. This paper compares the thermal performances and energy demand of a vernacular and a low-income modern dwelling using two major thermal comfort approaches (Givoni’s approach and adaptive thermal comfort recommended by The American Society of Heating, Refrigerating and Air-Conditioning Engineers in ASHRAE standards 55-2010) and the energy professional’s method presented in the French Thermal Regulations RT2012. It shows the effectiveness of bioclimatic and passive strategies in reducing energy demand, increasing the thermal comfort level for the buildings, and therefore reducing greenhouse emissions. The results show that the vernacular house was comfortable during the warm day, which approved a 100% cooling energy efficiency (the thermal comfort has been achieved in a passive way), contrary to the contemporary dwelling, in which the use of air-conditioning modern systems was essential to meet the occupant needs in terms of thermal comfort. The difference between the houses’ energy performances was estimated, including a 39% reduction in energy demand.

The objective of this research was to determine the proper thermal comfort in an atrium design for single-floor, medium-rise, and high-rise buildings based on different proportions, placements, window opening ratios, and internal condition systems. EDSL Tas software was used for the dynamic thermal simulation software models, and all were analyzed based on ASHRAE 55, ISO 7730, and EN 15251 standards to determine which dynamic thermal simulation models had thermal comfort in a hot and humid climate throughout the year. This research found that for naturally conditioned single-floor and medium-rise buildings, when the atrium proportion was 1/2 of the office proportion at the southeast and center atrium location, respectively, had maximum user satisfaction. When the building’s internal spaces were mechanically conditioned with a 1/3 and 1/4 atrium proportion of the office proportion in single-floor and medium-rise buildings, respectively, thermal comfort was acceptable, especially when the atrium was located in the center for single-floor and in the northeast for medium-rise buildings. However, the naturally conditioned high-rise building with a north-east atrium that was 1/4 of the office proportion and a mechanically conditioned high-rise with a center atrium 1/3 of the office proportion had the minimum dissatisfaction throughout the year.

The use of gypsum plaster in building blocks, in Brazil, is still a restricted item, due to lack of knowledge on technology. Another factor that restricts the use of the blocks is the location of the deposits of gypsum, a material that gives rise to the plaster, which are located in the West of the State of Pernambuco, located far from the large consuming centers, potentially located in the southeast of the country. However, the interest in your study is determined by the annual consumption growth that reaches about 8% per year in Brazil. For the development of this study, in particular for Brazil, it is important to analysis the housing deficit in Brazil. The analysis indicates a clear need for new housing construction in the country. Preferably should be chosen simple constructive solutions, fast and easy to implement, without neglecting the comfort and durability. The use of local natural endogenous resources such as gypsum plaster, can be an attractive solution from an environmental point of view as well as economical. Brazil is a very large country with very different climates throughout its regions, so it was made a comprehensive study of the country's climate data and the constructive strategies adopted by NBR15220 and NBR 15575 standards, for each bioclimatic zone, to ensure the minimum comfort conditions. The hygrothermal analysis, reflected on the thermal comfort and night time ventilation in Brazilian gypsum plaster houses, was based on the adaptive model described in ASHRAE 55 and ISO 7730 standards for the evaluation of thermal comfort.

This study aims at evaluating the perceived thermal sensation of occupants with respect to thermal comfort standards, ASHRAE 55 and ISO 7730, for office buildings located in Mediterranean climate. A small office building in Izmir Institute of Technology Campus Area, Izmir, Turkey, was chosen as a case building and equipped with measurement devices to assess thermal comfort of occupants with respect to predicted mean vote and actual mean vote. Both objective and subjective measurements were conducted. The former included indoor and out-door air temperature, mean radiant temperature, relative humidity and air velocity that were used for evaluating the thermal comfort of occupants. Oxygen concentration which can play an additional role in thermal comfort/discomfort, health and productivity of the office occupants, was also measured. Furthermore, occupants were subjected to a survey via a mobile application to obtain subjective measurements to calculate actual mean vote values. Based on objective and subjective measurements, the relationships among the parameters were derived by using simple regression analysis technique while a new combined mean vote correlation was also derived but this time by using multiple linear regression model. Neutral and comfort temperatures were obtained using indoor air temperature and actual mean vote values which were calculated from subjective measurements. The results showed that neutral temperature in the university office building was 20.9?C whilst the comfort temperature range was between 19.4 and 22.4?C for the heating season. By applying new comfort temperatures, energy consumption of the case building located in Mediterranean climate, can be reduced.

Heat loss quantification (HLQ) is an essential step in improving a building’s thermal performance and optimizing its energy usage. While this problem is well-studied in the literature, most of the existing studies are either qualitative or minimally driven quantitative studies that rely on localized building envelope points and are, thus, not suitable for automated solutions in energy audit applications. This research work is an attempt to fill this gap of knowledge by utilizing intensive thermal data (on the order of 100,000 plus images) and constitutes a relatively new area of analysis in energy audit applications. Specifically, we demonstrate a novel process using deep-learning methods to segment more than 100,000 thermal images collected from an unmanned aerial system (UAS). To quantify the heat loss for a building envelope, multiple stages of computations need to be performed: object detection (using Mask-RCNN/Faster R-CNN), estimating the surface temperature (using two clustering methods), and finally calculating the overall heat transfer coefficient (e.g., the U-value). The proposed model was applied to eleven academic campuses across the state of North Dakota. The preliminary findings indicate that Mask R-CNN outperformed other instance segmentation models with an mIOU of 73% for facades, 55% for windows, 67% for roofs, 24% for doors, and 11% for HVACs. Two clustering methods, namely K-means and threshold-based clustering (TBC), were deployed to estimate surface temperatures with TBC providing consistent estimates across all times of the day over K-means. Our analysis demonstrated that thermal efficiency not only depended on the accurate acquisition of thermal images but also relied on other factors, such as the building geometry and seasonal weather parameters, such as the outside/inside building temperatures, wind, time of day, and indoor heating/cooling conditions. Finally, the resultant U-values of various building envelopes were compared with recommendations from the American Society of Heating, Refrigerating, and Air-conditioning Engineers (ASHRAE) building standards.

Significativamente o uso de ar condicionado e melhoram o conforto térmico dos usuários. Isto pode ser ilustrado através dos hospitais da Rede Sarah Kubitschek projetados pelo arquiteto João Filgueiras Lima, Lelé, cujas soluções além de propiciarem ambientes mais agradáveis e salubres, evitam o uso de sistemas mecânicos de resfriamento, reduzindo o consumo de energia elétrica. Deste modo, o presente artigo tem como objetivo avaliar o conforto térmico dos hospitais Sarah de Salvador e do Rio de Janeiro, através de medições in loco da temperatura do ar, umidade relativa do ar e velocidade do ar. A análise dos resultados foi baseada em leituras de projeto, na norma ASHRAE Standard 55/2004 e em parâmetros adquiridos na literatura especializada. Os resultados demonstram a preocupação de Lelé na incorporação de aspectos bioclimáticos nos projetos. No Sarah - Salvador, alguns ambientes permaneceram fora da zona de conforto no período do meio dia, devido ao ganho de calor pela cobertura. No entanto, o uso da ventilação natural, auxilia no efeito de resfriamento, melhorando o conforto térmico nos espaços internos. Já no Sarah – Rio, todos os ambientes permanecem dentro da zona de conforto proposta pela ASHRAE 55.

PurposeThe paper aims to determine the thermal comfort perception of schoolchildren from a warm and humid environment. There is a concern about the effect of high temperature on the health and academic performance of schoolchildren.Design/methodology/approachObjective and subjective methodological approaches were adopted to collect data during the fieldwork in the selected primary schools. ASHRAE adaptive comfort model was adopted to analyze the data.FindingsThe paper provided empirical results about the comfort requirements of schoolchildren from the warm and humid environment. During the occupied school time, the studied schoolchildren were found to tolerate temperatures higher than the upper limit temperature recommended by ASHRAE Standard 55. The paper recommends that the studied children may not need any active ventilator to be thermally comfortable during the occupied school hoursOriginality/valueThe paper found the range of temperatures that schoolchildren from the warm and humid environment can adapt to. The information may be useful to architects, engineers and facility managers

Thermal comfort performance of three vacant naturally ventilated Royal Malaysia Police (RMP) case study lockups (LK1 in Penang, LK2 in Melaka & LK3 in Kuala Lumpur) was measured during monsoon change period from Northeast Monsoon to Southeast Monsoon. According to NGO’s report and previous studies, the lockups condition is very poor and hot which contribute to discomfort among detainees. The objectives of the study are to investigate thermal comfort performance of the lockups based on four environmental parameters (Ta, Tr, Va, & RH) through physical measurement, to predict thermal comfort performance based on operative temperature (To) and neutral operative temperature (Tneutop), and to compare the results with thermal comfort criteria recommended by ASHRAE 55 standard and previous thermal comfort studies in hot and humid climate. The results show that To and Tneutop reading of LK1 is exceeding the maximum range recommended by ASHRAE 55 and previous studies by 2% to 8% (To) and 1% (Tneutop) which categorizing LK1 condition as hot. This is mostly due to high hot airflow brought through an ineffective window opening. The results will be used as reference for improvement towards some aspects such as window opening, building finishes materials, space volume and building orientation in future lockup design.

The potential of sky radiation (SR) to serve the latent space cooling loads was evaluated. Using ASHRAE standard 55 comfort limits (room temperature 22 °C, relative humidity 60%, and dew-point temperature 13.9 °C), condensation was the chosen mechanism for humidity reduction. Typical meteorological year (TMY3) weather data were used for eleven ASHRAE climate zones. Three values of load-to-radiator ratio (LRR) (infiltration/ventilation volume flow rate times the ratio of building floor area to radiator area) were evaluated: 0.35, 3.5, and 35 m/h. Three thermal storage cases were considered: 1. Annual cooling potential, 2. Diurnal storage, and 3. Minimum storage capacity to serve the entire annual load. Six SR temperatures Trad = 13.9 to −26.1 °C were tested. Even in the most challenging climates, annual SR potential exceeded the total sensible and latent cooling load, at least for the lowest LRR and the highest Trad. For diurnal storage, SR served less than 20% of the load in the hot and humid southeast, but the entire load in the mountain west. The minimum storage capacity to meet the entire annual load decreased with decreasing LRR and decreasing Trad. For the southeast, large capacity was required, but for Louisville, for instance, sufficient capacity was provided by 0.05 m3 of water per m2 of floor area for LRR = 0.35 m/h. These results demonstrate that for much of the U.S., sky radiation has the potential to serve the entire annual sensible and latent cooling load.

In HVAC applications, huge amount of energy is utilized in fans and blowers to maintain the flow. In this paper energy savings associated with air distribution is discussed. In a most commonly used air distribution system, uniform thermal environment in the occupied space is established. An alternative to this method is the under floor air distribution system (UFAD) which is in its fantasy state. Thermal stratification can be established in this method due to the buoyancy flow of the air. In this paper assessment of the impact of temperature sensors in energy savings is done in UFAD system. It is observed that by the placement of temperature sensors in the occupied space, supply air temperature can be controlled while maintaining the comfort conditions. By optimal conditions of the temperature and volume flow, energy savings can be achieved due to reduction in energy requirements in refrigeration and ventilation. The comfort criteria of ASHRAE standard 55-92 is taken.

This paper describes the transitional zones of modern buildings and the impact of raising their temperature. A transitional zone is described as none steady-state spaces like entrance lobbies, corridors, lift-lobbies and landings, which allow occupants to transition through to more steady-state spaces. This paper presents the results of a dynamic simulation, where a typical case study building is used for an intervention of 1-5ºC increases in indoor temperature on energy demand. The results show raising the temperature in the transitional zones can result in a saving of 0.63% per ºC reduction of cooling for the whole building. The recommendation of this paper is to investigate a broadening of the thermal comfort parameters of these communal areas not serviced by the ASHRAE-55: 2-13, or any other standard, in order to identify the potential for reducing electricity used for cooling. Applying sensible engineering design load calculations will ensure comfort conditions and energy use are treated separately to occupied zones.

An effective passive cooling strategy is essential for reducing energy consumption in a residential building without ignoring thermal comfort. Therefore, a field measurement on the thermal performance of a corner terrace house in Kuala Lumpur was conducted to reveal the effectiveness of free running (FR) with four different approaches – no ventilation, full ventilation, day ventilation, and night ventilation. The measurement was done for all bedrooms and family area on the first floor. Also, mixed mode (MM) consisting of natural ventilation, mechanical ventilation with ceiling fan, and cooling with an air-conditioner that represents the actual condition of this house was also measured at living and dining area on the ground floor for comparison. The results reveal that FR from all approaches recorded a mean indoor air temperature of approximately 31 ∘C. The actual thermal condition of the house with MM on the ground floor was recorded at 30 ∘C, 1 ∘C lower than FR approach on the first floor. When compared with relevant international standards on predicting indoor comfort temperature based on outdoor temperature, FR was approximately 5 ∘C higher than predicted temperature based on American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 55 (2017), 3.4 ∘C higher than European Standard EN15251 and 1.5 ∘C higher than adaptive thermal comfort equation (ACE) for hot-humid climate. In comparison, MM performed better and was closer to relevant international standards, especially ACE for the hot-humid climate. As a conclusion, FR is not suitable for a hot-humid climate such as Malaysia to achieve a comfortable indoor thermal environment without any assisted ventilation use in MM.

A combined natural ventilation and mechanical fans are commonly used to cool the interior space inside the mosques in Malaysia. This article presents a study on thermal comfort in the Al-Jawahir Mosque, located in Johor Bahru, Malaysia. The objective is to assess the thermal comfort inside the mosque under the present ventilation system by determining the Predicted Mean Vote (PMV) and the Predicted Percentage of Dissatisfied (PPD). These values were then compared to the limits stated in the ASHRAE Standard-55. It was found that the PMV varies from 1.68 to 2.26 while the PPD varies from 61% to 87%. These show that the condition inside the mosque is quite warm. Computational fluid dynamics (CFD) method was used to carry out flow simulations, to identify a suitable strategy to improve the thermal comfort inside the mosque. Results of CFD simulations show that installing four exhaust fans above the windows on the west-side wall of the mosque is the most effective strategy to improve the thermal comfort inside the mosque. Both the PMV and PPD values can potentially be reduced by more than 60%.

A Questionnaire survey to understand the Thermal Comfort of the inhabitants was carried out in the traditional and modern residential buildings in the coastal region of Nagappattinam during various seasons. The list of Questionnaire was prepared based on the Literature studies from Thermal Comfort Survey – ASHRAE 55 standards to comprehend the effect of diverse Climatic factors such as temperature, humidity, air flow and overall thermal comfort factors in the evaluation of thermal comfort in traditional and modern residential buildings. The findings of this study were based on the collection of answers from the survey. The findings of the survey are compared with the technical investigations which is included at the end of this paper. These findings reveal that people living in the traditional buildings of the coastal belts of Nagapattinam are well modified to the harsh environment of traditional houses than modern houses.

The latest reality program about weight loss makeover, Australian Channel Seven’s Bringing Sexy Back maintained the dominant frame of fat as bad, shameful and unsexy. Similar to other programs’ point of view, only slim bodies could claim to be healthy and sexy. Conversely the Fat Acceptance movement presents fat as beautiful, sexy, and healthy. But what did online audiences in 2014 think about Bringing Sexy Back? In this article online-viewer-generated comments are analysed to find out: a) whether audiences challenged and contested the dominant framing; and b) what phrases did they use to do this. The research task is a discourse analysis in which key words and phrases are highlighted and colour coded as categories and patterns begin to emerge. My intention is to represent the expressions of the participants responding to the articles and or online forums about the program. The focus is on the ‘language-in-use’ (Gee 34), in particular their gut reactions to the idea of whether only slim people can be sexy and their experience of viewing the program. Selected television websites, online television forums and blogs will be analysed. Introduction The latest makeover television program drawing on the obesity-epidemic discourse Bringing Sexy Back (BSB) promises the audience that by the end of the program participants will have bought their sexy back. Sexy in the program is equated with one’s younger and slimmer self; the program host Samantha Armytage (from Sunrise the national Australian morning show) tells viewers sexy can be reclaimed if participants (from their late 30s and up to 51 years) drop kilos, commit to a strenuous exercise regime, and re-style their wardrobe. Experts, the usual suspects, are bought in—the medical machinery, the personal trainer, the stylist, and the hairdresser etc.—to assess, admonish, advise and appraise the participants. At the final reveal the audience—made up of family, friends and the local community—show enthusiasm for the aesthetic desirability of the participants slimmer sexier body as evidenced by descriptors such as “wow”, and “oh my God” as well as an outpouring of emotion such as crying and squeals of delight. Previous researchers of fat-shaming television programs have found audience’s reactions divided: some audience members see it as motivating; others see it as humiliating; and others see it as what the contestants deserve (Holland, Blood and Thomas; Rodan, Ellis and Lebeck; Sender and Sullivan)! I want to find out if online and social media audiences of the relatively tame makeover program BSB, which features individual Australians and couples who are overweight and obese, challenge and contest the dominant framing. In my analysis of the phrases online audiences’ have used about BSB, posters mostly found the program inspiring and motivating. From this inauspicious first strike, I will push onto examine the phrases posters have used to respond to the program. The paper begins with a short background about the program. The key elements of the makeover television genre are then discussed. Following this, I provide an analysis of the program’s official BSB Facebook site, and unofficial viewer-generated sites, such as the bubhub, TVTONIGHT, MamaMia, The Hoopla and the hashtag #sexybackau on Twitter. Posters to these sites were regular, infrequent or intermittent viewers. My approach to the analysis of these online forums and social media sites is a discourse analysis that examines “language-in-use”—as well as other elements such as values, symbols, tools and thinking styles—so as to identify and track tacit knowledge—that is, meanings emerging from obesity-epidemic discourse (Gee 34, 40–41). Such a method is apt given its capacity to analyse contributors’ spontaneous statements of their feelings—in particular their gut reactions to the program and the participants. The paper ends with my findings and conclusions. Bringing Sexy Back: Background Information Screened in 2014, season one of BSB format consists of a host Samantha Armytage, fitness trainer Cameron Byrnes and stylist Jules Sebastian and her team of hairdresser, groomers etc. Undoubtedly, part of the program’s construction is to select participants who appeal to a broad range of viewers. Participants’ ages range from 21 years (Courney Gollings) to 51 years (Vicki Gollings). The individuals or couples who make up the series include: Ned (truck driver), Sam and Gary (parents of two boys), Lisa Wilson (single mother and hairdresser), Vicki and Courtney Golling (mother and daughter), Livio Caldarone (pizza/small restaurant owner), and Paula Beckton (mother of four), The first episode was aired on Australia’s Channel Seven on 12 August 2014 and the final episode on 13 January 2015. This particular series consisted of 9 episodes. In this paper I focus on the six episodes that were aired in 2014. Generally each individual episode consisted of: the intervention, presenting medical facts about participant’s weight; the helper figures setting training and diet regimes; the trials leading to transformation; and the happy ending evident in the reveal. Essentially, these segments illustrate that the program series is highly contrived and they also demonstrate the program’s method of challenging participants to lose weight. Makeover Television I now provide a further construct to assist the reader’s understanding of ‘what is going on’ in the BSB program, which fits within the genre of makeover program. As reflected in the literature, makeover television has some or all of the following ingredients: personal fitness trainer as expertstylist and grooming expertsfamily members and contestant’s reflexivity (reflect on their own behaviour)new self-celebrated photo shootscontestant winning challengessymbols, such as the dream outfit, and before and after photographstransformation before the ‘big reveal’ Moreover, makeover programs are about the ordinary person on television. According to Redden, identities on these programs are individual rather than collective in that they serve to show a type of “individuality” as if it exists irrespective of any social or cultural group (156). And what is the role of the expert? Redden points out the expert on makeover programs interprets the “life situation of the given person, who may represent a certain social category of ordinary person” (153). So while makeover programs purport to be about the ordinary person and make claims about the actuality of the ordinary person’s life (Skeggs and Wood 559; Stagi 138), they also depict a hierarchy of social categories. The participants’ class also features in makeover programs like BSB. Class is evident in that participants who are selected to be on the program are often from lower-middle class backgrounds. Most participants have non-professional occupations—truck driver (Ned), hairdresser (Lisa), pizza/small restaurant owner (Livio), body caster, a person who makes body casts (Paula). Similar to The Biggest Loser (2004–2014) on American NBC, and Australia Network Ten, the participants in BSB were also mainly from lower–middle class backgrounds (Rodan; Sender and Sullivan 575) Several researcher’s show that makeover television promises advancement for lower–middle class citizens (Fraser 188–189; Miller 589; Redden 155; Skeggs and Wood 561) based on the proposition that contestants have the power to transform themselves (Bratich 17; Ouellette and Hay 471–472; Lewis 443; Sender and Sullivan 581). Like other makeover programs BSB takes advantage of the aspirations of working and lower-middle class participants. And, not surprisingly, the desired transcendence is something most participants/viewers from lower-middle and working class backgrounds cannot strive to achieve without participating in the program (Miller 589). Transcendence in BSB comes from losing weight, and acquiring new gym equipment, gym clothing, access to a personal trainer, gym membership, holiday at a health retreat, new wardrobe, new haircut, and new gym clothes. These acts to transform oneself are often “presented” as the middle class “standard,” taste and specific ongoing “intimate practices” of the “middle class” (Skeggs and Wood 561; Redden 155). But clearly much of the sprucing up (such as a private gym at home, personal trainers) are expensive and beyond the budget of even an Australian middle-class family. Analysis Posters on the official BSB Channel Seven Facebook forum overall were the most positive about the program—they found the program motivating and inspiring. Several posters on Facebook asked how they might apply to be on the program. After the airing of the reveal, posters on all the online forums and social media analysed consistently used adjectives such as fantastic, awesome, congratulations, stunning, amazing, gorgeous, wow, incredible, look sensational, look hot, look great, champion effort, fabulous, impressive, beautiful, inspirational. Fat-Shaming In BSB fat-shaming works through the use of medical machines and imagery, which measure weight and body fat percentage (BMI) using the DXA scanner and X-ray machine. Even though many physicians object to BMI measurement, it has become an “infallible marker of dangerous risk-saturated obesity” (Morgan 205) in Health Department campaigns, insurance company policies and on makeover television. Participants’ current weight is compared to the weight of their 20 year-old self. The program also induces fat-shaming through visuals of food and drink stashes found in participant’s bedroom cupboards (Ned), remnants of take-away packaging in rubbish bins (Lisa), processed foods in pantry cupboards (Vicki and Courtney), and pizza cartons at work (Livio). Here food amounts are quantified for audiences to gasp with shock and horror reinforcing the stereotype that people are fat because they have insufficient willpower and overeat (Farrell 34), thus perpetuating the view that obese people are undisciplined, sloppy and “less likely to do productive work” (Greenberg et al.). Banners are produced of participants’ photographs in their 20s; the photographs chosen have been taken when participants were slim and looked hot at the beach or night clubbing. These banners are juxtaposed with a banner of participant’s current self—appearing overweight in unflattering short crop top and underwear. Both banners are flashed onto the screen during the program especially in the final reveal presumably as a visual measurement to shame participants for “letting themselves go”. Even though host Samantha provides reasons for participants gaining weight—such as the stress of being a single parent, having a busy life as a mother of four, work commitments etc—the visual banners powerfully signify more than the presenter’s dialogue. Katrina Dowd on Facebook suggests it is the banners that signified the truth about participants’ lifestyles when she comments: Absolutely. Amazing how people whom follow unhealthy eating patterns for years with lack of exercise get congratulated because they’ve lost weight. Should never have let yourself get to that stage. Using your children and work commitments as excuses for why you got that way is a big “fail”. Some social media participants on Twitter and online forum posters saw the participants as “Bogan” ( a white working-class person who lacks fashion sense, is uncouth unsophisticated and invokes disgust), lazy, slobs as represented in the following comments: “Bogan Hunters Makeover” (tvaddict); “STILL A FUCKING FAT BOGAN […] JUST STOP EATING” (Al_Mack); “Stop being a lazy bitch […] Seriously lazy slobs” (Dutchess of Tweet St); “learn to cook lazy cow” (Gidgit VonLaRue). Thus, for Katrina and the posters above, it is the “fat body” that is seen as the “uncivilized body” that lacks the self-control of the thin body (Richardson 80). Inspirational and Motivational I discovered that many online forum and social media participants found the program BSB inspiring and motivating. A similar finding to my study of The Biggest Loser online viewers (Rodan), as well as other researchers who interviewed audiences about The Biggest Loser (Readdy and Ebbeck). For instance, Twitter posters said the BSB inspires “everyday women” (Sharon@Shar0n) and “inspires me that I can do the same” (Sharon@KeepitRealV), “another great show #inspiring” (miss shadow). On Facebook most of the posters talked about how inspired they were by the show and or by the individual participants, for instance: Hi Lisa, I think I see a lot of me in you, I pretty much cried through the whole show. You have inspired me, much admiration for sharing your story with Australia. (Haigh) Many posters on Facebook identified with Lisa as a single mother (Jenkins) and her declaration that she was “an emotional eater” (McTavish). This may account for Lisa Wilson (5,824 likes) receiving the most likes on Facebook. There were those who identified with individual participants, such as Paula, who were attempting to lose weight. On the forum the bubhub, a forum for parents established in 2002, the administrator BH-bubhub started a thread titled “Need some motivation to shift those kilos? Our pal Paula is here to help hubbers!” Paula was the participant on BSB who lost the most weight, and was invited onto the forum to answer forum members’ questions. On this forum, disparaging, negative, demotivating comments were removed from public viewing (see caveat BH-bubhub). Overall, online forum posters on the bubhub expressed positive feelings about BSB as a weight loss program. Participants comments included “Awesome work Paula, I have no doubt you will inspire many and I look forward to hearing all your tips” (Mod-Uniquey) “and … you look fabulous” (BH-KatiesMum), “Wow, you must be so proud of yourself! That is an amazing effort and you look great” (Curby), “What an inspirational story!” (Mod-Nomsie). Facebook posters on the BSB official forum found the show motivating and evidence of others finding the same are: “I feel great after watching #sexybackau” (Freeburn), “an uplifting hour” (Hustwaite), “feeling motivated now to change a lot of things about myself” (McDonald). However, online posters rarely commented that the program inspired or motivated them to take specific actions about their own body size or lifestyle. For some, as other researchers have found about makeover programs, it is a form of televisual escapism (Holland, Blood and Thomas; Readdy and Ebbeck 585)—that is, the pleasure of watching others’ emotions in achieving their goal. For many others, identifying with the participants’ struggle, and seeing them overcome daily challenges and obstacles to losing weight, gave posters insights about themselves and how to change their own lifestyle. But maintaining weight-loss and a lifestyle that supports it—as Facebook posters frequently suggest—is very challenging for most people who are overweight. The transformations and reveals make for fairy-tale endings (the essence of makeover television), but the reality of losing weight is persistence, perseverance and hard work. Criticisms of the Program Posters on Facebook were censored more than some of the other online forums and social media. Facebook criticisms about the program BSB were dealt with swiftly by other posters—that is, posters were pressured to only express positive feelings about the program. For instance, Lynne Nicholas in response to Peter Thomson’s criticism that the program is “exploiting these people for cheap television entertainment” (Facebook, 14 August 2014) posted on Facebook: If you don’t like the show then don’t come on the page and comment. Channel 7 gives these people a chance to change their life and inspire others to do the same. (Facebook, 14 Aug. 2014) And in response to criticisms about the amount of processed food Cam discarded from participants Vicki and Courtney’s cupboard, Emily McCabe commented: If you don’t enjoy the concept of the program, feel free to change the channel and keep your negative comments to yourself. (Facebook, 2 Sep. 2014) Nevertheless, a lot of criticism appeared on the various online and social media outlets ranging from: the commercial aspects (matúš; Hales); the constant use of the word “fat” by the host (Spencer); the sponsorship and advertisements by a take-away food company (Daisy Murray; Patriot); the “irresponsible/unsafe training!” (M_Gardner; Ashton); the insufficient number of “diet tips” (Pedron-Peggs); and “sick of seeing all that food thrown away!!” (Barkla; Dunell; Robbie; Martin; Coupland). As noted above, some of the sites were censored. Criticisms of the program were only aired if the online forum and social media allowed people to vent their feelings and express their opinion. Allowing viewers to express their concerns about mainstream television programs such as BSB counters the argument made by other researchers suggesting that makeover programs do the work of audiences becoming “self-managing” and self-governing citizens (see Stagi; Ouellette and Hay 471-472; Sender and Sullivan 581; Ringrose and Walkerdine); and makeover programs perpetuate the myth that obesity is solely an individual behavioural problem (Yoo). Such critical comments (above) reveal that some viewers do question the show’s premises, and as a consequence they do not accept the dominant framing. Thus the hypothesis that all viewers of makeover programs are pliable and docile cannot be supported in my analysis. Findings and Conclusion Most BSB posters said they found the program inspiring and motivating. It seems many of the online posters identified with the participants’ struggle to lose their weight, and stay motivated to keep it off. So there was little fat-shaming from posters on Facebook and the online forums. The posters on Facebook expressed the most positive comments about the BSB program and the participants; however, the Facebook site was the official BSB social media site. It seems that many of the Facebook and online forum discussants were makeover television fans who had acquired a taste for the makeover genre – that is the transformation and the big reveal at the end, the re-styled self, the symbols as well as the tips, information and ideas about how to lose weight and change their lifestyle. Questions were often asked by posters about the participants’ eating plan, exercise regime, maintenance program etc., as well as how they (the posters) could apply to be on the show. 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