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Journal articles on the topic 'Indoor air and particle flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Xu, Jiang Rong, Wen Min Tian, Fang Chen, and Yan Liu. "Inhalable Particles Transportation of the Kitchen in Different Ventilation Methods." Applied Mechanics and Materials 71-78 (July 2011): 2158–62. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.2158.

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In order to evaluate the particle exposure level of people indoor, and to improve indoor air quality, research for the particle distribution in residential kitchen is important. In this paper, a residential kitchen is investigated numerically, and the spread and distribution of particles are simulated detailed using the mixture two-phase model. We focused on the particles transportation in different ventilation methods. The four different conditions are designed for simulating the two-phase flow pattern, and the results of particle concentration of different ventilation methods and different p

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2

Hoque, Shamia, and Firoza Omar. "Coupling Computational Fluid Dynamics Simulations and Statistical Moments for Designing Healthy Indoor Spaces." International Journal of Environmental Research and Public Health 16, no. 5 (March 5, 2019): 800. http://dx.doi.org/10.3390/ijerph16050800.

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Cross-contamination between occupants in an indoor space may occur due to transfer of infectious aerosols. Computational fluid dynamics (CFD) provides detailed insight into particle transport in indoor spaces. However, such simulations are site-specific. This study couples CFD with statistical moments and establishes a framework that transitions site-specific results to generating guidelines for designing “healthy” indoor spaces. Eighteen cases were simulated, and three parameters were assessed: inlet/outlet location, air changes per hour, and the presence/absence of desks. Aerosol release due

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Li, Jing, Shao-Wu Yin, Guang-Si Shi, and Li Wang. "Optimization of Indoor Thermal Comfort Parameters with the Adaptive Network-Based Fuzzy Inference System and Particle Swarm Optimization Algorithm." Mathematical Problems in Engineering 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/3075432.

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The goal of this study is to improve thermal comfort and indoor air quality with the adaptive network-based fuzzy inference system (ANFIS) model and improved particle swarm optimization (PSO) algorithm. A method to optimize air conditioning parameters and installation distance is proposed. The methodology is demonstrated through a prototype case, which corresponds to a typical laboratory in colleges and universities. A laboratory model is established, and simulated flow field information is obtained with the CFD software. Subsequently, the ANFIS model is employed instead of the CFD model to pr

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Drąg, Marlena. "Model-Based Fiber Diameter Determination Approach to Fine Particulate Matter Fraction (PM2.5) Removal in HVAC Systems." Applied Sciences 11, no. 3 (January 23, 2021): 1014. http://dx.doi.org/10.3390/app11031014.

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Particulate Matter (PM) is a general term to classify air pollutants consisting of airborne particles. The particles vary in composition and size, and the sizes of particles range from 2.5 µm (PM2.5) to 10 µm (PM10). Anthropogenic activity (e.g., industrial processes or fuel/waste combustion) stands as the main emission source of PM. Due to the fact that indoor PM penetrates from the outside to indoor air, Heating, Ventilation, and Air-Conditioning (HVAC) filtration systems may play a significant role in decreasing air pollution indoors. The section of the respiratory tract affected by particu

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Wang, Kaiyuan, Suyuan Yu, Yingge Wu, and Wei Peng. "Measurements and analysis of adhesive forces for micron particles on common indoor surfaces." Indoor and Built Environment 29, no. 7 (July 15, 2019): 931–41. http://dx.doi.org/10.1177/1420326x19863830.

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Dust particle resuspension from indoor surfaces is an important source of particulate matter in indoor environments. The adhesive force represents the resistance of the particle to resuspension in an air stream and is a key factor in the resuspension process. The present study used an atomic force microscope (AFM) to measure the adhesive forces between three particle samples and four common indoor surfaces including acrylic, marble, epoxy flooring and wood flooring. The effects of different indoor surfaces were investigated using 12 particle–surface combinations. The results show that the aver

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Hashimoto, Akinori, and Toshiki Takahashi. "Simulation Study on Indoor Pollen Removal with Variable Exhaust Angle of an Air Purifier." Key Engineering Materials 643 (May 2015): 199–204. http://dx.doi.org/10.4028/www.scientific.net/kem.643.199.

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We calculate pollen grain trajectories in indoor airflow generated by an air purifier to investigate its pollen removal efficiency and effectiveness of the swinging louver at its air outlet. The air purifier has the directional airflow output vent on its top surface, and the elevation angle of the exhaust flow can be changed with time. The turbulent airflow field and particle motion are computed alternately. Since the turbulent calculation requires more computational time than the particle motion simulation, we need to accelerate the computation using graphics processing unit (GPU) to increase

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HASHIMOTO, Akinori, Toshiki TAKAHASHI, Kensaku MATSUMOTO, and Ken-ichi UZAKI. "Simulation of indoor air flow created by an air purifier and particle tracking calculation for pollen grains." Indoor Environment 15, no. 2 (2012): 147–61. http://dx.doi.org/10.7879/siej.15.147.

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Pasquarella, Cesira, Carla Balocco, Maria Eugenia Colucci, Elisa Saccani, Samuel Paroni, Lara Albertini, Pietro Vitali, and Roberto Albertini. "The Influence of Surgical Staff Behavior on Air Quality in a Conventionally Ventilated Operating Theatre during a Simulated Arthroplasty: A Case Study at the University Hospital of Parma." International Journal of Environmental Research and Public Health 17, no. 2 (January 10, 2020): 452. http://dx.doi.org/10.3390/ijerph17020452.

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Surgical staff behavior in operating theatres is one of the factors associated with indoor air quality and surgical site infection risk. The aim of this study was to apply an approach including microbiological, particle, and microclimate parameters during two simulated surgical hip arthroplasties to evaluate the influence of staff behavior on indoor air quality. During the first hip arthroplasty, the surgical team behaved correctly, but in the second operation, behavioral recommendations were not respected. Microbiological contamination was evaluated by active and passive methods. The air velo

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9

Xu, Yukun, Xin Wang, Chen Huang, Guangyao Du, and Yujie Zhang. "Assessing the interaction of air from a jet diffuser on a thermal plume in a room using two-dimensional particle image velocimetry." Building Services Engineering Research and Technology 40, no. 6 (January 12, 2019): 669–81. http://dx.doi.org/10.1177/0143624418824798.

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Traditional design of airflow distributions in large spaces does not consider the interference of thermal plumes on jets. In order to quantitatively describe the indoor environment, it is first necessary to quantify how the airflow gets distributed. In this study, a two-dimensional particle image velocimetry (PIV) system for measuring a wide indoor flow field was established. A total of 24 sub-regions (each with a size of 400 mm × 350 mm) were accurately measured in an unmanned room, and the overall cross-sectional flow field was obtained by splicing. Uncertainty analysis proved the rationalit

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10

Kim, Ji-Hye, Hee-Gang Kim, and Myoung-Souk Yeo. "Ventilation and Filtration Control Strategy Considering PM2.5, IAQ, and System Energy." Atmosphere 11, no. 11 (October 22, 2020): 1140. http://dx.doi.org/10.3390/atmos11111140.

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Ventilation or filtration control is widely applied to improve indoor particle matter (PM) concentration. Adjusting the ventilation rates to control indoor PM levels can affect the concentration of other indoor pollutants and energy costs, and increasing the filtration flow rate can lower the indoor PM concentration, but also increase the fan energy consumption. In this study, we developed a ventilation and filtration control strategy to determine the optimal control mode and flow rate of the system to meet indoor PM (especially PM2.5) concentration, ensure adequate indoor air quality (IAQ), a

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11

Lima, Anyele Albuquerque, Izabelly Carollynny Maciel Nunes, José Leandro da Silva Duarte, Lucas Meili, Patricia de Carvalho Nagliate, and Alda Graciele Claudio dos Santos Almeida. "Characteristics of SARS-CoV-2 aerosol dispersion in indoor air: scoping review." Research, Society and Development 10, no. 4 (April 17, 2021): e44310414300. http://dx.doi.org/10.33448/rsd-v10i4.14300.

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Background: SARS-CoV-2 is the infectious agent responsible for COVID-19, its transmission occurs through the release of respiratory droplets and aerosols. Aim: Identify the main characteristics of SARS-CoV-2 aerosols dispersion in indoor air. Methods: Scoping Review was conducted using the databases: National Library of Medicines – MEDLINE/Pubmed, Scopus, Web of Science, Virtual Health Library (VHL) and Cochrane Library, the search in gray literature was performed on Google Scholar, OpenGrey and Grey Literature Report, from March to September 2020. The descriptors used were "coronavirus" and "

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12

Han, Bangwoo, Ji-Su Kang, Hak-Joon Kim, Yong-Jin Kim, and Hyosig Won. "Analysis on Particle Cleaning Capacity of Indoor Air Cleaners for Different Flow Rates Considering Energy Consumption." Journal of Korean Association for Particle and Aerosol Research 9, no. 3 (September 30, 2013): 139–47. http://dx.doi.org/10.11629/jpaar.2013.9.3.139.

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13

Geiling, Thomas, Lothar Dressler, Tilo Welker, and Martin Hoffmann. "Fine Dust Measurement with Electrical Fields – Concept of a Hybrid Particle Detector." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2013, CICMT (September 1, 2013): 000131–36. http://dx.doi.org/10.4071/cicmt-2013-wp15.

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Fine dust measurements are only conducted at few locations in our daily environment, although it is getting clearer that fine dust poses a high risk on human health. A reason for this deficit is the lack of suitable measurement systems, especially for indoor environments. Of special interest are particles with critical dimension smaller than 10 μm. They constitute the highest risk to human health as they are not filtered out by the respiratory system. By miniaturizing particle detector concepts point-of-care applications are rendered possible and production costs can be greatly reduced with mi

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Sahu, A. K., T. N. Verma, and S. L. Sinha. "Numerical Simulation of Air Flow in Multiple Beds Intensive Care Unit of Hospital." International Journal of Automotive and Mechanical Engineering 16, no. 2 (July 5, 2019): 6796–807. http://dx.doi.org/10.15282/ijame.16.2.2019.24.0511.

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Indoor air quality ventilation diminishes airborne respiratory and other transmission in hospitals. Airflow in associate medical care Unit (ICU) may be provided through natural mean and additionally by the assistance of mechanical ventilation. Natural ventilation might not be enough to satisfy the requirement of ventilation for associate degree ICU. In the present study, numerical simulation of the airflow pattern and contaminant movement using Computational Fluid Dynamics (CFD) has been carried out for multiple bed hospital ICU with different inlet angles to examine path of contaminant transf

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15

Ahn, Hosang, Jae Sik Kang, Gyeong-Seok Choi, and Hyun-Jung Choi. "Optical Sensing Approach to the Recognition of Different Types of Particulate Matters for Sustainable Indoor Environment Management." Sustainability 12, no. 24 (December 17, 2020): 10568. http://dx.doi.org/10.3390/su122410568.

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The indoor environment is a crucial part of the built environment where our daily time is mostly spent. It is governed not only by indoor activities, but also affected by interconnected activities such as door opening, walking and routine tasks throughout the inside and outside of buildings and houses. Pollutant control is one of the major concerns for maintaining a sustainable indoor environment, and finding the source of pollutants is a relatively hard part of that task. Pollutants are emitted from various sources, transformed by sunlight, react with vapor in ozone and are transported into c

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16

Olstrup, Henrik, Annika Hagenbjörk, and Hans Orru. "Ventilation Systems and Their Impact on Nanoparticle Concentrations in Office Buildings." Applied Sciences 11, no. 19 (September 25, 2021): 8930. http://dx.doi.org/10.3390/app11198930.

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Nanoparticles (NPs) can infiltrate indoor environments and have a large impact on human health when inhaled. Thus, indoor air quality is highly dependent on the outdoor air and on the filters used in the ventilation systems. In the NanoOffice study, the concentrations and the size distribution of NPs were measured with a five-minute time resolution in twelve office buildings in Umeå. Measurements were taken with an SMPS 3938 during a one-week period in the heating and nonheating seasons. Large differences in ventilation between buildings appeared, despite the fact that similar MVHR ventilation

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17

Topisirovic, G., D. V. Petrovic, and R. Maletic. "Spatial distributions of airborne dust in a cows barn exposed to influence of different ventilation rates." Biotehnologija u stocarstvu 29, no. 2 (2013): 373–83. http://dx.doi.org/10.2298/bah1302373t.

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Information on the concentration of dust particles is an important microclimate parameter that characterizes the local environmental quality of each livestock building. Increased concentration of dust particles primarily affects the indoor air quality and, consequently, the animal and workers health. Among many others, ventilation rate is a vital parameter that controls the spatial distribution of airborne dust particles in livestock buildings. This was the main motive for authors of this paper to research the influence of rotation rate of under-roof axial fans (i.e. the air flow rate) on airb

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18

Luo, Na, Wenguo Weng, Xiaoyu Xu, and Ming Fu. "Human-walking-induced wake flow – PIV experiments and CFD simulations." Indoor and Built Environment 27, no. 8 (March 28, 2017): 1069–84. http://dx.doi.org/10.1177/1420326x17701279.

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Quantitative measurement of indoor air distribution or local air velocity around a moving occupant is necessary to study the contaminant transport and energy efficiency in a building. This study measured the longitudinal and cross-sectional air flow distributions at different moving speeds. Experiments were conducted in a small-scale chamber with a moving cylinder, which served as a surrogate of a scaled-down human body. The flow field was measured by the particle image velocimetry technique. The measurements revealed an upward air vortex and a strong downward airflow behind the moving body al

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19

Do, Sangwon, Myeongjae Lee, and Jong-Seon Kim. "The Effect of a Flow Field on Chemical Detection Performance of Quadrotor Drone." Sensors 20, no. 11 (June 8, 2020): 3262. http://dx.doi.org/10.3390/s20113262.

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The determination of a suitable sensor location on quadrotor drones is a very important issue for chemical reconnaissance platforms because the magnitude and direction of air velocity is different for each location. In this study, we investigated a customized chemical reconnaissance system consisting of a quadrotor drone and a chip-sized chemical sensor for detecting dimethyl-methylphosphonate (DMMP; a Sarin simulant) and investigated the chemical detection properties with respect to the sensor position through indoor experiments and particle image velocimetry (PIV) analysis of the system. The

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20

Craven, Brent A., and Gary S. Settles. "A Computational and Experimental Investigation of the Human Thermal Plume." Journal of Fluids Engineering 128, no. 6 (March 19, 2006): 1251–58. http://dx.doi.org/10.1115/1.2353274.

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The behavior of the buoyant plume of air shed by a human being in an indoor environment is important to room ventilation requirements, airborne disease spread, air pollution control, indoor air quality, and the thermal comfort of building occupants. It also becomes a critical factor in special environments like surgery rooms and clean-rooms. Of the previous human thermal plume studies, few have used actual human volunteers, made quantitative plume velocity measurements, or considered thermal stratification of the environment. Here, a study of the human thermal plume in a standard room environm

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21

Sakharov, Alexander S., and Konstantin Zhukov. "Study of an Air Curtain in the Context of Individual Protection from Exposure to Coronavirus (SARS-CoV-2) Contained in Cough-Generated Fluid Particles." Physics 2, no. 3 (July 6, 2020): 340–51. http://dx.doi.org/10.3390/physics2030018.

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The ongoing respiratory COVID-19 pandemic has heavily impacted the social and private lives of the majority of the global population. This infection is primarily transmitted via virus-laden fluid particles (i.e., droplets and aerosols) that are formed in the respiratory tract of infected individuals and expelled from the mouth in the course of breathing, talking, coughing, and sneezing. To mitigate the risk of virus transmission, in many places of the world, the public has been asked or even obliged to use face covers. It is plausible that in the years ahead we will see the use of face masks,

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22

Li, Chunying, Haida Tang, Junyi Tan, Cuimin Li, Yinan Yang, and Fanbo Zeng. "Numerical simulation on year-round performance of water-flow window with different shading control modes." Building Services Engineering Research and Technology 42, no. 2 (November 3, 2020): 157–74. http://dx.doi.org/10.1177/0143624420970397.

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Water-flow window combines the functions of transparent building envelop, solar collector, as well as sun shading. Coloured particles are added to the flowing water within window cavity in order to provide extra shading, prevent indoor glare and enhance solar collection. The energy consumption of both air-conditioning system and water heating device can be further reduced. The aim of present investigation is to predict and analyze the year-round energy performance of a well-insulated water-flow window with different shading control modes. Accordingly, physical model of water-flow window is bui

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Wang, Yuan Yuan, Gang Cheng Wang, and Yu Cao. "Process of Micro-Simulation of Infilitration Clogging for Highland Reservoir Dam Foundation." Advanced Materials Research 490-495 (March 2012): 2386–90. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2386.

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Using of numerical models of particle flow are based on discrete element theory, combining with the indoor infiltration clogging tests in the region of south mountain in Tibet, the whole development process of the infiltration clogging of loose foundation is simulated. The loss volume, fluid velocity，osmotic coefficient, porosity and moving track of particle samples are recorded and traced in the analytical model, which reveals the water-soil interaction throughout the whole process of the infiltration clogging. The results show that clogging often occurs in the upper soil. Particle trajectory

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Özer, Özgün, and Dilek Kumlutaş. "Experimental investigation on cross flow fan’s casing parameters inside of a split air conditioner indoor unit by Stereo Particle Image Velocimetry." Applied Thermal Engineering 124 (September 2017): 1233–46. http://dx.doi.org/10.1016/j.applthermaleng.2017.06.053.

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25

Mbazima, Setlamorago Jackson, Masilu Daniel Masekameni, and Gill Nelson. "Physicochemical Properties of Indoor and Outdoor Particulate Matter 2.5 in Selected Residential Areas near a Ferromanganese Smelter." International Journal of Environmental Research and Public Health 18, no. 17 (August 24, 2021): 8900. http://dx.doi.org/10.3390/ijerph18178900.

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Particulate matter (PM) of different sizes and elemental composition is a leading contributor to indoor and outdoor air pollution in residential areas. We sought to investigate similarities between indoor and outdoor PM2.5 in three residential areas near a ferromanganese smelter in Meyerton to apportion the emission source(s). Indoor and outdoor PM2.5 samples were collected concurrently, using GilAir300 plus samplers, at a flow rate of 2.75 L/min. PM2.5 was collected on polycarbonate membrane filters housed in 37 mm cassettes coupled with PM2.5 cyclones. Scanning electron microscopy coupled wi

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Wang, Huan, Guijin Wang, and Xianting Li. "Implementation of demand-oriented ventilation with adjustable fan network." Indoor and Built Environment 29, no. 4 (January 7, 2020): 621–35. http://dx.doi.org/10.1177/1420326x19897114.

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Airflow patterns are essential for heating, ventilation and air conditioning (HVAC) systems. Traditional HVAC systems are predesigned and operated using a fixed airflow pattern. However, the indoor occupancy and heat source always vary and therefore, the fixed flow pattern cannot efficiently maintain the required indoor environment conditions. In this study, a novel Adjustable Fan Network (AFN) for improving airflow pattern manoeuvrability is proposed. It integrates multiple small and adjustable axial fans into an AFN, enabling it to change the airflow pattern based on the actual demand with o

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27

Wang, Jian, Li Sha Chai, and Hao Wu. "Numerical Simulation on the Sinking Process of Open Caisson with Particle Flow Code (PFC)." Advanced Materials Research 838-841 (November 2013): 831–34. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.831.

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Sidewall pressure is important to open caisson design. However, FEM simulation for the sinking process of open caisson is quite difficult due to extremely large deformation including soil flow and solid boundary movement. In order to overcome this problem, Particle Flow Code (PFC), which is based upon discrete element method (DEM), was applied to simulate the whole sinking process of an open caisson using proposed load servo mechanism, and the variations of the sidewall pressure with sinking depth and elevation were investigated. The outcomes agree well with the in-situ observation data and th

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Caldart, C., J. Souza, M. Z. Pellegrin, Glaucea Warmeling Duarte, M. R. Rocha, E. Angioletto, A. A. Pasa, and M. A. Fiori. "Influence of High Energy Milling on the Airflow Sensorproperty of the NBCa Ceramic." Materials Science Forum 727-728 (August 2012): 499–504. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.499.

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Some materials have been applied in many surrounding conditions as sensors, electronic devices and other applications. Inexpensive and reliable temperature and flow measurement are important in many applications including, for example, environmental monitoring and control, indoor air conditioning, weather forecasting, automotive and aerospace systems. Special ceramics are an example of such materials. Neodymium-Barium-Copper is a special ceramic that has high electrical conductivity and airflow sensor characteristics. This property is influenced by high energy milling of the powder, when it is

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Fonseca, Ana Sofia, Anna-Kaisa Viitanen, Tomi Kanerva, Arto Säämänen, Olivier Aguerre-Chariol, Sebastien Fable, Adrien Dermigny, et al. "Occupational Exposure and Environmental Release: The Case Study of Pouring TiO2 and Filler Materials for Paint Production." International Journal of Environmental Research and Public Health 18, no. 2 (January 7, 2021): 418. http://dx.doi.org/10.3390/ijerph18020418.

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Pulmonary exposure to micro- and nanoscaled particles has been widely linked to adverse health effects and high concentrations of respirable particles are expected to occur within and around many industrial settings. In this study, a field-measurement campaign was performed at an industrial manufacturer, during the production of paints. Spatial and personal measurements were conducted and results were used to estimate the mass flows in the facility and the airborne particle release to the outdoor environment. Airborne particle number concentration (1 × 103–1.0 × 104 cm−3), respirable mass (0.0

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Fonseca, Ana Sofia, Anna-Kaisa Viitanen, Tomi Kanerva, Arto Säämänen, Olivier Aguerre-Chariol, Sebastien Fable, Adrien Dermigny, et al. "Occupational Exposure and Environmental Release: The Case Study of Pouring TiO2 and Filler Materials for Paint Production." International Journal of Environmental Research and Public Health 18, no. 2 (January 7, 2021): 418. http://dx.doi.org/10.3390/ijerph18020418.

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Pulmonary exposure to micro- and nanoscaled particles has been widely linked to adverse health effects and high concentrations of respirable particles are expected to occur within and around many industrial settings. In this study, a field-measurement campaign was performed at an industrial manufacturer, during the production of paints. Spatial and personal measurements were conducted and results were used to estimate the mass flows in the facility and the airborne particle release to the outdoor environment. Airborne particle number concentration (1 × 103–1.0 × 104 cm−3), respirable mass (0.0

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Zheng, Li Ning, Qiang Xie, Wen Zhao, Meng Fei Qu, and Chun Hua Li. "Microscopic Mechanics of Debris Accumulation Body with Expansive Fine Grain and PFC Numerical Simulation." Advanced Materials Research 243-249 (May 2011): 4188–94. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4188.

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To study the influence mechanism of the excavation stability of the debris accumulation body by the expansive fine grain, it has used by Particle Flow Code, based on indoor test, the fine-grain expansive effect has divided into fine-grain intensity attenuation and volume expansion, and it has linear decreased down from the surface on the accumulation body. Based on the contrastive analysis between simulated result and traditional finite element, the Particle Flow Code is more accurate and true. The analysis result has suggested that when consider the expansive action, the damage model is chang

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Borowski, Marek, Michał Karch, Rafał Łuczak, Piotr Życzkowski, and Marek Jaszczur. "Numerical and experimental analysis of the velocity field of air flowing through swirl diffusers." E3S Web of Conferences 128 (2019): 05003. http://dx.doi.org/10.1051/e3sconf/201912805003.

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The air swirl diffusers are popular for the ceiling level air supply system and have been widely used for Indoor Air Quality. They are nowadays one of the most popular diffusers commonly used in airconditioning systems [1, 2]. The swirl diffusers are intended to use in low- and medium-pressure ventilation systems. They allow for obtaining the swirl airflow and are especially recommended to use in spaces with the height from 3m up to 12m, where heating and cooling is performed by the ventilation system and where the exact setting of supply air velocity is important [3-6]. In the case of swirl d

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Wang, Huan, Maohui Luo, Guijin Wang, and Xianting Li. "Airflow pattern induced by ceiling fan under different rotation speeds and blowing directions." Indoor and Built Environment 29, no. 10 (November 25, 2019): 1425–40. http://dx.doi.org/10.1177/1420326x19890054.

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Ceiling fans have been widely used as effective cooling and air mixing method for building environment conditioning. Understanding its airflow characteristics can be helpful to utilize ceiling fan or integrate it with background air conditioning system. However, the airflow induced by ceiling fan has different flow patterns under different rotating speeds and blowing directions. To date, it is still challenging to capture those complicated airflow fields in room scale. In this study, the airflow pattern induced by a ceiling fan was measured with a new technology, quad-view colour sequence part

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Alimohammadi, Hossein, Kristina Vassiljeva, Eduard Petlenkov, Martin Thalfeldt, Alo Mikola, Tuule Mall Kull, and Ahmet Köse. "Gray Box Time Variant Clogging behaviour and Pressure Drop Prediction of the Air Filter in the HVAC System." E3S Web of Conferences 246 (2021): 10002. http://dx.doi.org/10.1051/e3sconf/202124610002.

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Identification and prediction of clogging behavior in heating, ventilation, and air conditioning (HVAC) filters is crucial to avoid issues such as system overheating, energy waste, lower indoor air quality, etc. Researchers are focusing more on the particle loading characteristics of a filter medium in a laboratory environment under steady-state conditions, fixed particle concentrations, area of porosity, dust feed and volumetric flow rate. However, recent research still shows uncertainties in modeling as well as the implementation problems of constructing the HVAC laboratory test bench and eq

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Orlando, Roberta, Merve Polat, Alireza Afshari, Matthew S. Johnson, and Peter Fojan. "Electrospun Nanofibre Air Filters for Particles and Gaseous Pollutants." Sustainability 13, no. 12 (June 8, 2021): 6553. http://dx.doi.org/10.3390/su13126553.

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Nanofibre filters may offer new properties not available in commercial fibre filters. These include a higher surface area and the ability to include novel materials within the fibres. In addition the small size allows potential gains in performance due to the slip-flow phenomenon in which normal gas viscosity does not apply to objects smaller than the mean free path of the gas. We tested the properties of novel electrospun fibre filters generated from polyvinyl alcohol solutions, optionally embedded with nano-grains of photocatalytic TiO2 and activated charcoal. The tested materials exhibited

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Pérez, Agustín Leiva, Ely F. Sacón Vera, Rodolfo Najarro Quintero, Azucena Elizabeth Bernal, David W. Moreira Vega, and Joffre A. Andrade Candell. "Purificación Del Aire Ambiente Interior En La Fábrica De Productos Lácteos “Quesos Latacunga” , Cotopaxi, Ecuador." European Scientific Journal, ESJ 13, no. 15 (May 31, 2017): 47. http://dx.doi.org/10.19044/esj.2017.v13n15p47.

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The purification of the internal ambient air of the "Latacunga Cheese" factory was studied by the application of ozone. It is an energetic oxidizing agent which is able to kill the microorganisms present in the medium where it is found. It is applied in its appropriate doses with the aim of purifying the air environment of the workshop. The concentrations of fungi and bacteria found before the application of ozone were higher than that allowed by the Spanish legislation "UNE 100012 Hygiene of systems". Among the fungi identified were Aspergillus sp., Penicilium sp., Scopulariopsis sp., Fusariu

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Karadeniz, Ziya Haktan, Dilek Kumlutaş, and Özgün Özer. "Experimental visualization of the flow characteristics of the outflow of a split air conditioner indoor unit by meshed infrared thermography and stereo particle image velocimetry." Experimental Thermal and Fluid Science 44 (January 2013): 334–44. http://dx.doi.org/10.1016/j.expthermflusci.2012.07.005.

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Di, Yiwen, Jinhan Mo, Yinping Zhang, and Jiewen Deng. "Ozone deposition velocities on cotton clothing surface determined by the field and laboratory emission cell." Indoor and Built Environment 26, no. 5 (January 28, 2016): 631–41. http://dx.doi.org/10.1177/1420326x16628315.

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Interfacial ozone-initiated chemistry can greatly influence human exposure to reactants and products in the indoor environment. As the nearest reaction interface to human body, clothing assumes an important role in the generation of ultrafine particles and volatile organic compounds when reacting with indoor ozone. However, little is known about the kinetics of ozone-clothing reactions. This investigation developed a convenient method to examine the reaction kinetic parameters of ozone-clothing reactions by using a field and laboratory emission cell. Deposition velocity can be determined in a

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Schuster, Romain, Dominique Heitz, Philippe Georgeault, and Etienne Mémin. "On-site airflow measurement of a laboratory fume hood using customized large-scale image-based velocimetry." Indoor and Built Environment 29, no. 6 (July 29, 2019): 810–19. http://dx.doi.org/10.1177/1420326x19865928.

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This study demonstrates the feasibility of conducting on-site large-scale image-based measurements for indoor airflows characterisation. To illustrate the potential of our method, we chose to study the suction flow generated by a laboratory fume hood in operating conditions. As a matter of fact, laboratory fume hoods are frequently subject to routine checks during which air speed measurements by hot-wire anemometry are performed. However, classical point-to-point hot-wire anemometry may be not sufficient to detect and locate potential leakages. To improve these controls, we developed and teste

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Yang, Young Kwon, Min Young Kim, Yong Woo Song, Sung Ho Choi, and Jin Chul Park. "Windcatcher Louvers to Improve Ventilation Efficiency." Energies 13, no. 17 (August 28, 2020): 4459. http://dx.doi.org/10.3390/en13174459.

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Windcatcher louvers are designed to capture air flowing outside a building in order to increase its natural ventilation. There are no studies that have designed the shape of the louver to increase the natural ventilation efficiency of the building. This study aimed to conduct a computational fluid dynamics simulation and mock-up test of a Clark Y airfoil-type windcatcher louver designed to increase the natural ventilation in a building. The following test results were obtained. The optimal angle of attack of the airfoil was calculated via a numerical analysis, which demonstrated that the wind

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Chen, Chun, Bin Zhao, and Xudong Yang. "Impact of two-way air flow due to temperature difference on preventing the entry of outdoor particles using indoor positive pressure control method." Journal of Hazardous Materials 186, no. 2-3 (February 2011): 1290–99. http://dx.doi.org/10.1016/j.jhazmat.2010.12.003.

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Ribalta, Carla, Ana López-Lilao, Ana Sofia Fonseca, Alexander Christian Østerskov Jensen, Keld Alstrup Jensen, Eliseo Monfort, and Mar Viana. "Evaluation of One- and Two-Box Models as Particle Exposure Prediction Tools at Industrial Scale." Toxics 9, no. 9 (August 29, 2021): 201. http://dx.doi.org/10.3390/toxics9090201.

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One- and two-box models have been pointed out as useful tools for modelling indoor particle exposure. However, model performance still needs further testing if they are to be implemented as trustworthy tools for exposure assessment. The objective of this work is to evaluate the performance, applicability and reproducibility of one- and two-box models on real-world industrial scenarios. A study on filling of seven materials in three filling lines with different levels of energy and mitigation strategies was used. Inhalable and respirable mass concentrations were calculated with one- and two-box

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Seng, Ng Chee, Abdul Mutalib Leman, and Azmahani Sadikin. "Experimental and Simulation Validation Methods of Local Exhaust Ventilation (LEV) in Training Facilities Building." Applied Mechanics and Materials 315 (April 2013): 997–1001. http://dx.doi.org/10.4028/www.scientific.net/amm.315.997.

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LEV is a ventilation system that collects and sucks out particles such as dusts, mists, gases, vapors or fumes out of work station, so that they can’t be breathed in by occupants. There is a lot of LEV allocated and installed in order to help protecting occupants’ health but it doesn’t work properly. To overcome this issue, computational fluid dynamics (CFD) will be implemented. Past studies CFD techniques represent a very significant improvement of air ventilation systems. However, CFD is just a tool in prediction model, which can lead to inaccuracy of predicting airflow due to problems with

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Verma, Tikendra Nath, and Shobha Lata Sinha. "Contaminant Control in Intensive Care Unit of Hospital." Applied Mechanics and Materials 592-594 (July 2014): 2486–90. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2486.

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The complex hospital environment requires special attention to ensure healthy indoor air quality (IAQ). It is necessary to protect to patient and healthcare workers against hospital acquired infections and occupational diseases. In a hospital environment, there is a trend of high concentrations of harmful micro-organisms. From an infection control perspective, the primary objective of hospital design is to place the patient at no risk of infection during hospitalization. Many people consider that hospitals are generally clean and free from pathogens which are actually not true. Hospitals are h

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Mishra, Rosaline, B. K. Sapra, and Y. S. Mayya. "Emerging Trends in ²²²Rn and ²²⁰Rn Decay Products Detection." Solid State Phenomena 238 (August 2015): 134–39. http://dx.doi.org/10.4028/www.scientific.net/ssp.238.134.

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The importance of measuring the decay products of 222Rn (radon) and 220Rn (Thoron) is being realized by researchers as these are the major inhalation dose givers to the general population. Basically the decay products are radioisotopes of Polonium, Bismuth and Lead, which are solid particles. Upon inhalation, these particles deposit in different parts of the respiratory tract, undergo radioactive decay and irradiate the nearby tissues. So, the study of the behavior of the decay products in indoor air is important for assessing the natural background radiation exposures received by general popu

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Chung, K. C., and C. Y. Lee. "Using Particle Trajectories to Evaluate Indoor Air Quality." Indoor Environment 4, no. 3-4 (May 1995): 170–76. http://dx.doi.org/10.1177/1420326x9500400307.

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Chung, K. C., and C. Y. Lee. "Using Particle Trajectories to Evaluate Indoor Air Quality." Indoor and Built Environment 4, no. 3-4 (1995): 170–76. http://dx.doi.org/10.1159/000463630.

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Owen, M. K., D. S. Ensor, and L. E. Sparks. "Airborne particle sizes and sources found in indoor air." Atmospheric Environment. Part A. General Topics 26, no. 12 (August 1992): 2149–62. http://dx.doi.org/10.1016/0960-1686(92)90403-8.

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Górny, Rafał L., Tiina Reponen, Klaus Willeke, Detlef Schmechel, Enric Robine, Marjorie Boissier, and Sergey A. Grinshpun. "Fungal Fragments as Indoor Air Biocontaminants." Applied and Environmental Microbiology 68, no. 7 (July 2002): 3522–31. http://dx.doi.org/10.1128/aem.68.7.3522-3531.2002.

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ABSTRACT The aerosolization process of fungal propagules of three species (Aspergillus versicolor, Penicillium melinii, and Cladosporium cladosporioides) was studied by using a newly designed and constructed aerosolization chamber. We discovered that fungal fragments are aerosolized simultaneously with spores from contaminated agar and ceiling tile surfaces. Concentration measurements with an optical particle counter showed that the fragments are released in higher numbers (up to 320 times) than the spores. The release of fungal propagules varied depending on the fungal species, the air veloci

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Wang, Yue Ren, Cong Xue, and Jing Zhang. "Kitchen and Toilet of the Residence Exhaust Flow Field Analysis." Advanced Materials Research 354-355 (October 2011): 726–31. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.726.

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Adopting the k-ε standard model, the CFD simulation software to simulate the indoor kitchen and toilet different row of indoor air volume air distribution in natural ventilated circumstance, by comparison results show that different row of indoor air volume changes in the rate of secondary pollution rate, and then to provide the change rule of indoor air quality protection reference basis.

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