Academic literature on the topic 'Ventilation system with fan coil unit'
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Journal articles on the topic "Ventilation system with fan coil unit"
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A., Vijay kumar, and Bala Kumar |. M. Dinesh kumar K. "Preparation of Fan Coil Unit using Revit Software." International Journal of Trend in Scientific Research and Development 3, no. 3 (2019): 1382–87. https://doi.org/10.31142/ijtsrd23376.
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This project "Fan coil unit preparation by using Revit software" deals with the study of air conditioner and water conditioner system in a single unit. The main object behind this project is to supply chilled water through MS pipes based on load calculations by considering the required standards. In this pipe design calculations are done by using the AUTODESK REVIT MEP software to design pipes with proper adjustments and fittings. This fan coil unit system is to be designed only for places where natural ventilation is available. The multifunctional system which can provide cold water, refrigeration effect and air conditioning effect with regular air or space conditioning system. Fan coil unit is based on indirect refrigeration system mostly used as secondary refrigeration system. In this project we have using water as primary refrigerant. Along with this, air and water systems are used primarily for perimeter building spaces with high sensible loads and where close control of humidity is not a primary criterion. These systems work well in the residential buildings, office buildings, hospitals, schools, apartment buildings, and other buildings where their capabilities can meet the project design intent and criteria. In most climates, these systems are designed to provide all of the required heating and cooling needs for perimeter spaces, and simultaneous heating and cooling in different spaces during intermediate seasons. A. Vijay kumar | O. Ajay kumar | K. Bala Kumar | M. Dinesh kumar "Preparation of Fan Coil Unit using Revit Software" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23376.pdf
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Prek, Matjaž, Gorazd Krese, and Žiga Lampret. "Incorporating cooling and ventilation effects into a single IEQ indicator." E3S Web of Conferences 111 (2019): 02011. http://dx.doi.org/10.1051/e3sconf/201911102011.
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The influence of dissimilar cooling and ventilation system combinations on indoor environmental quality (IEQ) has been studied. A comparison of chilled ceiling cooling in combination with displacement ventilation, cooling with fan coil unit, and cooling with flat wall displacement inlets was performed. All observed variations were evaluated based on whole-body and local thermal comfort criteria as well as with regard to ventilation effectiveness. The analysis was made based on results of numerical simulations carried out in two steps. First, DesignBuilder was applied to model the buildings’ thermal performance and to evaluate its interaction with the environment. The latter included the calculation of heat gains as well as the heat loss on the boundary surfaces of the observed air-conditioned room. In the second step, ANSYS Fluent was used to simulate the response of indoor environment by utilizing the simulation results obtained in the first step, in order to evaluate the interaction between building and human. Afterwards, the observed thermal comfort and ventilation criteria were merged into a novel indoor environment indicator, which enables to describe the indoor environment quality with a single value. Among the analysed systems, the ceiling cooling system in combination with displacement ventilation was found to be the most suitable as it offers a high level of thermal comfort with adequate ventilation efficiency. Fan coil cooling was the least favourable option in terms of thermal comfort, while flat wall displacement inlets exhibited the lowest ventilation effectiveness. The performed investigation demonstrated the necessity to assess indoor environment with regard to IEQ in addition to energy consumption.
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Lin, Chang-Ming, Hsin-Yu Liu, Ko-Ying Tseng, and Sheng-Fuu Lin. "Heating, Ventilation, and Air Conditioning System Optimization Control Strategy Involving Fan Coil Unit Temperature Control." Applied Sciences 9, no. 11 (2019): 2391. http://dx.doi.org/10.3390/app9112391.
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The objective of this study was to develop a heating, ventilation, and air conditioning (HVAC) system optimization control strategy involving fan coil unit (FCU) temperature control for energy conservation in chilled water systems to enhance the operating efficiency of HVAC systems. The proposed control strategy involves three techniques, which are described as follows. The first technique is an algorithm for dynamic FCU temperature setting, which enables the FCU temperature to be set in accordance with changes in the outdoor temperature to satisfy the indoor thermal comfort for occupants. The second technique is an approach for determining the indoor cold air demand, which collects the set FCU temperature and converts it to the refrigeration ton required for the chilled water system; this serves as the control target for ensuring optimal HVAC operation. The third technique is a genetic algorithm for calculating the minimum energy consumption for an HVAC system. The genetic algorithm determines the pump operating frequency associated with minimum energy consumption per refrigeration ton to control energy conservation. To demonstrate the effectiveness of the proposed HVAC system optimization control strategy combining FCU temperature control, this study conducted a field experiment. The results revealed that the proposed strategy enabled an HVAC system to achieve 39.71% energy conservation compared with an HVAC system operating at full load.
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Zeng, Yun Fan, and Min Hui Zhang. "A Central Air Conditioning System Design for Guesthouse in Changsha City." Applied Mechanics and Materials 170-173 (May 2012): 2431–36. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2431.
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This article presents the design of the air conditioning system in the building. In the project, ice storage for cold source and electric boiler thermal storage for heat source are taken while variable primary flow is used for water system. Taking into account the functions of each part, all air and fan coil unit with fresh air system are applied in ventilation system. The design of air exhaust system is introduced. A detail scheme about the annual operational regulation for energy saving is proposed. During the designing process, energy conservation is given enough attention, and the reliability of operation is also ensured.
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An, Ik-Hyun, Su-Hoon Park, Yong-Ho Lee, et al. "Comparison of Local Mean Age of Air between Displacement Ventilation System and Mixing Ventilation System in Office Heating Conditions during Winter." Buildings 14, no. 1 (2024): 115. http://dx.doi.org/10.3390/buildings14010115.
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A novel displacement ventilation system (DVS) was designed using a four-way cassette fan coil unit (FCU) and air purifiers (APs) for supplying clean air. The proposed DVS in this study involved drawing indoor air through the FCU and diffusers installed in the ceiling, controlling air temperature using the FCU, and then discharging it back into the office through the APs placed on the floor. The comparative ventilation system considered was the typical mixing ventilation system (MVS) that intakes and exhausts indoor air using diffusers installed on the ceiling. The local mean age of air was used as an index to compare indoor air quality between DVS and MVS under winter heating conditions. It was found that the DVS was more effective in improving indoor air quality in winter than the MVS. Moreover, compared to the MVS, utilizing the DVS designed in this study resulted in the advantage of a much more uniform air temperature variation in the office space. Therefore, it is anticipated that modifying the structure of an indoor space with an FCU installed in the ceiling and APs on the floor to use the DVS designed in this study would greatly assist in enhancing indoor air quality.
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Park, Su-Hoon, Ik-Hyun An, Yong-Ho Lee, et al. "Enhancement of Indoor Air Quality with a Displacement Ventilation System Comprising a 4-Way Fan Coil Unit and Multiple Air Purifiers." Sustainability 16, no. 5 (2024): 1740. http://dx.doi.org/10.3390/su16051740.
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In indoor spaces without mechanical ventilation systems, a common approach involves using a ceiling-mounted 4-way fan coil unit (4WFCU) to regulate indoor temperature and placing floor-level air purifiers (APs) to remove indoor pollutants. This study introduces a differentiated displacement ventilation system (DVS) that connects multiple APs to the 4WFCU using ductwork. The age of air was compared between the case where the newly designed DVS was implemented and the reference case where 4WFCU and APs operated independently. When there were no obstacles in the office central area, the reference system exhibited a lower age of air. Conversely, when obstacles such as desks and partitions were present in the central area, the proposed DVS was found to improve indoor air quality. The DVS resulted in minimal interference among pathlines of the air discharged from multiple floor-level APs and their efficient suction through the ceiling-mounted 4WFCU and diffusers, significantly reducing stagnant air zones, while pathlines of the air discharged from the 4WFCU and APs interfered significantly when they operated independently, leading to larger stagnant areas in the air distribution. Therefore, modifying office spaces with ceiling-mounted 4WFCUs using the proposed DVS is anticipated to substantially enhance indoor air quality through a straightforward installation process.
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Lee, Jungsuk, Ik-Hyun An, Su-Hoon Park, Kyung-Rae Lee, Young-Won Kim, and Se-Jin Yook. "Comparison of Indoor Air Quality in Summer and Winter According to Four-Way Cassette Fan Coil Unit Operation in a Four-Bed Ward." Toxics 10, no. 9 (2022): 504. http://dx.doi.org/10.3390/toxics10090504.
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This study targeted a four-bed ward with a ventilation system and a four-way cassette fan coil unit (4-way FCU) installed on the ceiling. The indoor air quality under summer and winter conditions was comparatively analyzed. The age of air was calculated by conducting tests and simulations under diverse conditions, assuming that the ventilation system and 4-way FCU were continuously operating. The use of an air cleaner and ward curtain was investigated for its impact on the air quality in the breathing zone of a patient lying on the bed, and effects of the airflow and discharge angle of the 4-way FCU were considered. Because the 4-way FCU was installed in the central part of the ceiling, where indoor air is sucked in and subsequently discharged in four directions, the age of air at each bed was found to vary depending on the airflow and discharge angle of the 4-way FCU. When the airflow and discharge angle of the 4-way FCU was fixed, the age of air at each bed appeared to be lower during winter heating than in summer cooling mode. The age of air was significantly lowered at each bed, depending on the use of the curtain and the air cleaner along with the ventilation system and 4-way FCU, and appropriate seasonal operating conditions were identified to maintain a lower age of air at each bed.
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Iglesias, Ferran, Joaquim Massana, Llorenç Burgas, Narcís Planellas, and Joan Colomer. "Methodological Advances in Temperature Dynamics Modeling for Energy-Efficient Indoor Air Management Systems." Applied Sciences 15, no. 8 (2025): 4291. https://doi.org/10.3390/app15084291.
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Heating, ventilation, and air conditioning (HVAC) systems account for up to 40% of the total energy consumption in buildings. Improving the modeling of HVAC components is necessary to optimize energy efficiency, maintain indoor thermal comfort, and reduce their carbon footprint. This work addresses the lack of a general methodology for data preprocessing by introducing a novel approach for feature extraction and feature selection based on physical equations and expert knowledge that can be applied to any data-driven model. The proposed framework enables the forecasting of indoor temperatures and the energy consumption of individual HVAC components. The methodology is validated with real-world data from a system involving a fan coil unit and a thermal inertia deposit powered by geothermal energy, achieving a coefficient of determination (R2) of 0.98 and mean absolute percentage error (MAPE) of 0.44%.
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Wang, Yuting, Jingjing Shao, Jo Darkwa, and Georgios Kokogiannakis. "Dynamic Simulations of Phase-Change Emulsions in Cooling Systems." Buildings 15, no. 11 (2025): 1873. https://doi.org/10.3390/buildings15111873.
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The application of phase change material emulsions (PCMEs) in heating, ventilation, and air conditioning (HVAC) systems is considered to be a potential way of saving energy due to their relatively higher energy storage capacity compared with water. They are now widely used as a heat transfer media, so they are able to reduce the flow rate whilst delivering the same amount of cooling energy. In order to evaluate the energy-saving potential of the integrated PCME air conditioning system, whole-building energy simulation was carried out with the building simulation code TRNSYS. Before simulating the whole system, a mathematical model for a PCME-integrated fan coil unit was first developed and validated. A phase change material emulsion called PCE-10 was used, and the TRNSYS simulation showed that the required volumetric flow rate of phase change material emulsions was 50% less than that of water when providing the same cooling effect, which could contribute to a 7% reduction in total energy consumption.
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Pandora Raharjo, Maria Carizza, Wahyu Setia Budi, and Eddy Prianto. "SISTEM PENGHAWAAN PADA KAMAR HOTEL." Jurnal Arsitektur ARCADE 6, no. 2 (2022): 290. http://dx.doi.org/10.31848/arcade.v6i2.1010.
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Abstract: Nowadays, development in urban areas is progressing very rapidly, accompanied by an increase in the number of residents and various kinds of activities carried out. Seeing this phenomenon, many developers are competing to build multi-layered high buildings. Air conditioning systems in high-rise buildings are generally carried out with artificial air arrangements. The Grand Edge Hotel Semarang building is one of the multi-layered high-rise buildings that will be the case study. This hotel building is located in Semarang on an area of 2860 m2, 7 floors above ground and 3 basement floors as deep as 9 meters from ground level, total floor area is 15,958 m2. The electricity used from PLN is 700 KVA, equipped with 1 generator unit with a capacity of 650 KVA. The ventilation system used in this building is in the form of an artificial air system, including: Direct Air Conditioning (AC) Fan Coil Unit with Split Ducting system, as many as 117 units, with capacities of 1.5 PK, 2 PK, 3.5 PK and 10 PK. The ventilation system used in terms of the specifications of the AC unit used is able to produce conditions according to the PERMENKES No. 1077/MENKES/PER/V/2011, especially in hotel rooms. The information obtained at this time is a prelude to obtaining quantitative-qualitative data about the existing problems, as well as the form of the solution, it is necessary to deepen and add cases in the project.Abstrak: Dewasa ini pembangunan di perkotaan melaju sangat pesat yang disertai dengan jumlah peningkatan penduduk dan berbagai macam aktivitas yang dilakukan nya. Melihat fenomena tersebut maka banyak dari para developer berlomba-lomba untuk membangun bangunan tinggi berlapis. Sistem penghawaan pada bangunan tinggi umum nya dilakukan dengan tatanan udara buatan. Bangunan Hotel Grand Edge Semarang adalah salah satu bangunan tinggi berlapis yang akan menjadi studi kasus ini. Bangunan hotel ini terletak di Semarang diatas lahan 2860 m2, berlantai 7 lapis diatas tanah dan 3 lantai basement sedalam 9 meter dari permukaan tanah, luas lantai total 15.958 m2. Tenaga listrik yang digunakan dari PLN sebesar 700 KVA, dilengkapi 1 unit genset dengan kapasitas 650 KVA. Sistem penghawaan yang digunakan bangunan ini berupa tatanan udara buatan, meliputi : Air Conditioning (AC) langsung Fan Coil Unit dengan sistem Split Ducting, sebanyak 119 buah, dengan kapasitas 1,5 PK, 2 PK, 3,5 PK dan 10 PK. Sistem penghawaan yang digunakan dari sisi spesifikasi unit AC yang dipakai mampu menghasilkan kondisi yang sesuai standar PERMENKES No. 1077/MENKES/PER/V/2011, khususnya pada kamar hotel. Info yang didapatkan saat ini adalah sebuah awalan untuk mendapatkan data kuantitatif-kualitatif tentang permasalahan yang ada, serta bentuk solusinya perlu diadakan pendalaman dan penambahan kasus di proyek.
Dissertations / Theses on the topic "Ventilation system with fan coil unit"
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Mazálek, Karel. "Tepelné čerpadlo pro ohřev teplé vody." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378273.
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This Master's thesis deals with reusing waste heat from the kitchen and .cold rooms of a restaurant, as a source of heat for heat pump water heater. The first part is about basic principles and theory which is needed to understand the function of heat pump and possibilities of reusing wasted heat. In the other parts, there are calculations and designs not only of a heat pump, but also coolers and ventilation unit needed for recycling of heat.
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Yu, Fu, and 傅宇. "Communication enabling technique for embedded control system: Modbus-enabled fan coil unit controllers for HVAC systems." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/33525752727059625640.
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碩士<br>國立臺灣科技大學<br>電機工程系<br>93<br>An embedded control system (ECS) provides a specific control function to a larger system where the ECS is embedded. In distributed control applications, it is often desired to enable an ECS with communication capability for the purpose of central monitoring at the user operational side and remote control at the physical controlled plant side. This paper addresses the communication enabling technique for a Modbus-enabled fan coil unit controller geared to the HVAC systems in medium to large air conditioning spaces. Communication enabling technique studied here includes: (1) design of two separate modules of user interface and control mechanism to suit communication application context, (2) definition of communication compliant functions based on application syntax, and (3) implementation of designated communication drivers through software, thus reducing the otherwise required hardware cost. With a proposed architecture that separates user interface panel from the embedded control core, the Modbus-enabled fan coil unit controller makes it possible to control up to 256 ceiling mounted fan coil controller modules through Modbus network by just one wall mounted user interface module
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柯宜松, Yi-Sung Ke, and 柯宜松. "An Experimental Study on the Preventive Schemes for Surface Condensation of Fan Dry Coil Unit (FDCU) System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/w45f29.
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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>100<br>As horizontal positioning at ceiling level of current Fan Dry Coil Unit (FDCU) installation, condensation and leakage of chill water may cause and, thereafter, resulting
a casualty. Therefore, the objective of this study is to investigate and evaluate the performance of several preventative schemes for condensation and chill water eruption of the FDCU system.
Specifically, this study focuses on the following four preventative schemes. First,the original horizontal dry coils were modified to be V shape so as to contain the
possible condensed water or leakage chill water. Second, the condensation detector and leaked water detector were installed. Experimental tests were performed to evaluate the
reacting effectiveness of any condensation and leakage of chilled water. Third, the original positive-pressure of supply water system was changed to a negative one. Fourth,
an expansion tank was installed so as to maintain a negative-pressure. A tiny water valve was installed on welding surface of the coil. This tiny valve was to simulate a leakage or a pine hole of the coil. The situation of water leakage was recorded and discussed.
Experimental results show that the V shape dry coil can efficiently guide the condensed water to the water tray. Through the condensation detector, surface condensation can be prevented. Negative-pressure water supply system proved to be a good option for the prevention of leakage of chilled water.
Conference papers on the topic "Ventilation system with fan coil unit"
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Marion, Flore A., Sophie V. Masson, Frederik J. Betz, and David H. Archer. "Cogeneration System Performance Modeling." In ASME 2008 2nd International Conference on Energy Sustainability collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/es2008-54256.
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A bioDiesel fueled engine generator with heat recovery from the exhaust as steam and from the coolant as hot water has been installed in the Intelligent Workplace, the IW, of Carnegie Mellon’s School of Architecture. The steam and hot water are to be used for cooling, heating, and ventilation air dehumidification in the IW. This cogeneration equipment is a primary component of an energy supply system that will halve the consumption of primary energy required to operate the IW. This component was installed in September 2007, and commissioning is now underway. In parallel, a systems performance model of the engine generator, its heat recovery exchangers, a steam driven absorption chiller, a ventilation unit, fan coil cooling/heating units has been programmed making use of TRNSYS transient simulation software. This model has now been used to estimate the energy recoverable by the system operating in the IW for different characteristic periods, throughout a typical year in Pittsburgh, PA. In the initial stages of this modeling, the engine parameters have been set at its design load, 27 kW, delivering up to 17 kW of steam and 22 kW of hot water according to calculation. The steam is used in the absorption chiller during the summer and in hot water production during the winter. Hot water is used in desiccant regeneration for air dehumidification during the summer, in IW heating during the winter, and in domestic hot water product year around. Systems controls in the TRNSYS simulation direct the steam and hot water produced in the operation of the engine generator system to meet the IW’s hourly loads throughout seasons.
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Marion, Flore, Fred Betz, and David Archer. "Cogeneration System Modeling Based on Experimental Results." In ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90184.
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A 25 kWe cogeneration system has been installed by the School of Architecture of Carnegie Mellon University that provides steam and hot water to its Intelligent Workplace, the IW. This cogeneration system comprises a biodiesel fueled engine generator, a steam generator that operates on its exhaust, a hot water heat exchanger that operates on its engine coolant, and a steam driven absorption chiller. The steam and hot water are thus used for cooling, heating, and ventilation air dehumidification in the IW. This cogeneration system is a primary component of an overall energy supply system that halves the consumption of primary energy required to operate the IW. This cogeneration system was completed in September 2007, and extensive tests have been carried out on its performance over a broad range of power and heat outputs with Diesel and biodiesel fuels. In parallel, a detailed systems performance model of the engine generator, its heat recovery exchangers, the steam driven absorption chiller, a ventilation and air dehumidification unit, and multiple fan coil cooling/heating units has been programmed making use of TRNSYS to evaluate the utilization of the heat from the unit in the IW. In this model the distribution of heat from the engine to the exhaust, to the coolant, and directly to the surroundings has been based on an ASHRAE model. While a computational model was created, its complexity made calculation of annual performance excessively time consuming and a simplified model based on experimental data was created. The testing of the cogeneration system at 6, 12, 18 and 25 kWe is now completed and a wealth of data on flow rates, temperatures, pressures throughout the system were collected. These data have been organized in look up tables to create a simplified empirical TRNSYS component for the cogeneration system in order to allow representative evaluation of annual performance of the system for three different mode of operation. Using the look up table, a simple TRNSYS module for the cogeneration system was developed that equates fuel flow to electricity generation, hot water generation via the coolant heat exchanger, and steam production via the steam generator. The different modes of operation for this cogeneration system can be design load: 25 kWe, following the thermal — heating or cooling — load, following the ventilation regeneration load. The calculated annual efficiency for the different mode is respectively 66% 68% and 65%. This cogeneration installation was sized to provide guidance on future cogeneration plant design for small commercial buildings. The new cogeneration TRNSYS component has been created to be applicable in the design of various buildings where a similar cogeneration system could be implemented. It will assist in selection of equipment and of operating conditions to realize an efficient and economic cogeneration system.
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Song, Li, and Briana Branesky. "Air Handling Unit Level Fault Signature Development Using EnergyPlus." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87574.
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In the effort to create more energy efficient buildings, an effective fault detection process must be developed for monitoring and diagnosing malfunctions in the Heating Ventilation and Air Conditioning (HVAC) system. This study provides energy loss signatures that can be used to diagnose a specific faulty component at the unit level. An analysis has been performed on a single air handling unit (AHU) to determine how faulty HVAC components effect the overall energy consumption of the unit. To begin the process, the Engineering Laboratory building on the campus of the University of Oklahoma was modeled for the simulation, using EnergyPlus 7.0, Google Sketchup 8, and OpenStudio 0.6.0. The building has an existing single duct system with a 3hp AHU with a forward curved fan that discharges 2500 cfm (1.175 m3/s) that covers approximately 2809 square feet (261 m2). Inputs into the simulation included building constructions, architecture, internal loads, and external loads from weather, sun, and shade objects. Simulations were run using the stated software, and a base case was established for energy consumption. Next, components and variables on the AHU, such as minimum outside air intake, economizer outside damper control, cooling coil valve, duct work pressurization, and various sensors were individually modified to reflect a malfunction or inefficiency. The energy loss caused from these changes in inputs was quantified and analyzed for the purpose of establishing a graphical range of energy loss signatures associated with each faulty component. Building Engineers and operators will be able to not only detect the exact malfunction faster, but also to ascertain the associated energy loss cost associated with the fault. The results of the study will be used to automate an online energy monitoring fault detection and diagnosis process.
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Srivastava, Viraj, Yun Gu, and David Archer. "Adaptive Control of Indoor Thermal Environments Using Fan Coil Units." In ASME 2008 2nd International Conference on Energy Sustainability collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/es2008-54292.
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The work described in this paper relates to advanced control systems, specifically designed for heating, ventilation and air conditioning in office buildings. This work specifically focuses on the use of state of the art fan coil units with advanced instrumentation and control. The premise of the work is that control systems can be significantly enhanced by using real-time data from a distributed sensor network deployed in the building. Specifically, the performance of control systems can be improved by augmenting predictive (feed-forward) control operations with techniques to improve the accuracy of models. A control algorithm for heating, ventilating and air-conditioning systems is described in this paper that integrates an advanced feedforward control algorithm with conventional feedback control. This paper further contains a description of a functional prototype used to demonstrate the proposed control algorithm for indoor thermal environmental control. The test-bed used in this work — the Robert L Preger Intelligent Workplace (IW), at Carnegie Mellon University, involves a large number of variables and hence a complex control task, i.e., the test bed contains multiple sources of thermal energy, and multiple constraints and disturbances — both measurable and immeasurable. The algorithms demonstrated in this test-bed are expected to perform satisfactorily on other environments with smaller number of variables. This paper contains a description of experiments that were performed to validate the comfort and energy benefits of increased sensing using fan coil units that are in installed in two spaces in the IW.
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Douglass, Stuart R. "Auxiliary Ventilation Systems Design Basis and Analysis Approach." In ASME 2010 Power Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/power2010-27149.
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Auxiliary systems supporting pressurized water reactors (PWR) within commercial nuclear power plants are enclosed within a special ventilation (SV) zone that is isolated post-accident. Air within the SV zone is recirculated through carbon adsorbers, and discharged at a rate equal to the SV zone air infiltration rate. The SV zone relies on safety-related fan coil units (FCUs) to remove heat since air infiltration is kept to a minimum in order to reduce the spread of contamination. This paper discusses efforts undertaken to quantify area heat loads and FCU operating conditions within the SV zone, and transient analyses performed for loss of FCUs using the GOTHIC code.
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Novak, Paulo Rogerio, Nathan Mendes, and Gustavo Henrique da Costa Oliveira. "Simulation and Analysis of a Secondary HVAC System Using MATLAB/SIMULINK Platform." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59570.
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In this paper, the mathematical model of a secondary system (fan-coil) of a HVAC equipment is described. This system was inserted into a computer code developed in Matlab/Simulink platform devoted to the analysis of buildings hygrothermal behavior and performance of closed-loop control systems. The model is presented in terms of state-space variables that represent the energy and mass balance for each component of the fan-coil. Results are presented in terms of a comparative analysis of the cooling coil temperature and external air ventilation rate effects on the room air psychrometrics state. Finally, the control system performance is presented for both temperature and relative humidity.
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Li, Pengfei, Yaoyu Li, and John E. Seem. "Modelica Based Dynamic Modeling of an Air-Side Economizer." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-13173.
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For the heating, ventilating, and air conditioning (HVAC) systems for commercial buildings, the cooling coils in air handling units (AHU) account for a significant fraction of total building energy consumption and have a major impact on comfort conditions and maintenance costs. Development of cost-effective advanced control strategies will enhance the performance and efficiency of AHU. The control design process can be greatly facilitated with simulation on high-fidelity dynamic model prior to experimental validation and implementation. This paper presents a dynamic model for an air-side economizer. The model development was based on Dymola and AirConditioning Library with some revision on heat exchanger modeling. For chilled-water cooling coil modeling, the major challenges include the variation of coil surface conditions under flow rate changes and partially-dry-partially-wet operations. This study proposes a dynamic coil model that is capable of predicting cooling performances under fully dry, partially-dry-partially-wet, and fully wet conditions. Validation with experimental data from a benchmark study was conducted under both dry and wet surface conditions. The model predicted the experimental results quite well for both transient and steady-state behaviors. In addition, other moist air components, such as dampers, fans, ducts and room, were developed. Such transient model will lay a more quality foundation for controller validation at the simulation phase.
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Colino, Mark P., and Elena B. Rosenstein. "A New Advance in Tunnel Ventilation Design Planning." In 2017 Joint Rail Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/jrc2017-2203.
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The new train signaling, traction power and tunnel ventilation system coordination guidelines enacted in National Fire Protection Association (NFPA) Standard 130 have brought the necessity and cost of tunnel ventilation fan shafts into greater focus. The guidelines were aimed at coordinating the three aforementioned rail systems to control the number of trains that could be between successive ventilation shafts during an emergency — in recognition of the fact that the best protection to both incident and non-incident train passengers and crew is to allow no more than one train in each ventilation zone. Though based in safety, these new NFPA guidelines can substantially expand the capital cost and environmental impact of new rail tunnel projects by adding more ventilation shafts and tunnel fan equipment to the scope of work. In addition, the resulting increase in the required number of ventilation shafts and tunnel fan equipment can hinder existing railroad properties as they seek to either increase their train throughput rates, or reduce their tunnel electrical infrastructure. Fortunately, a new kind of emergency ventilation shaft has been developed to facilitate compliance with the NFPA 130 Standard without the excessive capital cost and far-reaching environmental impacts of a traditional emergency ventilation shaft. This new kind of emergency ventilation shaft is called the Crossflue. The Crossflue is a horizontal passage between parallel rail tunnels with a single ventilation fan-motor unit installation. The Crossflue fan is designed to transfer air/smoke flows from one (occupied, incident) tunnel to another (unoccupied, non-incident) tunnel — thereby protecting the incident tunnel at the expense of the non-incident tunnel. The Crossflue passage has angled construction to allow a smooth transition of airflows both into and out of the adjoining tunnels. In addition to the fan, the Crossflue contains a ventilation damper, sound attenuators, ductwork transitions and flexible connectors within the fan equipment line-up; the functionality of all this mechanical equipment is described in the paper. To preserve underground space and minimize the rock excavation, the Crossflue fan is both remotely-powered and remotely-controlled; the fan is only operated as part of a pre-programmed response to tunnel fire events. The methodology utilized to design the Crossflue was taken from the Subway Environmental Design Handbook (SEDH); the SEDH [1] was specifically developed for rail tunnel ventilation design and is the preeminent reference volume in the industry. In summary, the Crossflue provides a dual benefit of achieving NFPA 130 compliance, while at the same time minimizing the construction, equipment, environmental, and energy costs of a traditional tunnel ventilation shaft.
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Wei, Bing, and Huayi Yang. "Energy Consumption Analysis of Residential Central Air Conditioning Systems." In ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/es2009-90201.
Full textAbstract:
Nowadays the energy crisis has been more and more severe all over the world. In China there is enormous energy source, but due to the large number of population, the average possession of the total energy is lower, and the energy supply is relatively less. Enormous energy consumption of air conditioning systems in the residential buildings makes the energy conservation more important. The residential central air conditioning systems are being widely used due to its advantages of easy control and low operating cost. But there are still many problems to be resolved, of which the energy consumption of the residential central air-conditioning systems is a hot issue. The main cold and heat sources for residential central air conditioning systems are air-cooled heat pump unit, household gas air conditioning unit, air-cooled chiller unit/gas-fired boiler and water loop heat pump unit. The terminal facilities suited for the anterior three units are the fan coil units, and the terminal of the last water loop heat pump unit is normally indoor unit. The combined utilization of the heat and cold source units with their terminal units keep the indoor environment in desired state all the year. In this paper, based on an actual example, the basic principles of four systems mentioned above are outlined and analyzed, and four schemes are compared. By using the method of equivalent weight full load operation time, the annual energy consumptions of the four schemes are calculated and analyzed. Comparing the annual primary energy consumption of four schemes, the following conclusions can be drawn: in the case studied, the energy consumption of the household gas-fired air conditioning unit with fan coil system is the maximum, the consumption of the air-cooled chiller unit/gas-fired boiler with fan coil system is the next, then is the air-cooled heat pump with fan coil system, and that of the water loop heat pump system is the minimum. It can be observed that the water loop heat pump system is the optimal one and is the best on energy conservation. Through the study of this paper, the minimum energy consumption system is chosen so as to give the references for the energy savings of air-conditioning systems in the practice.
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Chien, Liang-Han, Chia-Sung Huang, Wen-Jung Liao, and Yew-Khoh Chuah. "Numerical Simulations of Air Flow in a Full Scale Clean Room Incorporating Fan Curves of Fan Filter Units." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98537.
Full textAbstract:
This manuscript presents the air flow fields and pressure distributions of a full scale class 100 semiconductor clean room system using a computational fluid dynamics (CFD) model that incorporates flow resistances of various components in the air path. The fan-performance curves of fan filter unit (FFU), the pressure-velocity curves of the dry coil and the ULPA are included in the model. The pressure and velocity distributions of the present simulation are in reasonable agreement with the measurement in the real clean room system during operation. The numerical methodology of the present work is found to be a useful design tool of a FFU type clean room for the estimation of clean room pressure, velocity distribution and air exchange rate.