The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
Meng Kong - One of the best experts on this subject based on the ideXlab platform.
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Micro-environmental control for efficient local cooling: Results from Manikin and human participant Tests
Building and Environment, 2019Co-Authors: Meng Kong, Thong Q Dang, Chetna Chianese, Teng Teng, Brian Carter, Alan Hedge, Jianshun Zhang, H. Ezzat KhalifaAbstract:Abstract The micro-environment in this study refers to the air space and environment around a person that directly impacts their thermal sensation. This study aims at evaluating the performance of a newly developed micro-environmental control system (μX) designed to cool the occupants locally for thermal comfort when the temperature in the ambient unoccupied space is raised from 23.9 °C to 26.1 °C in summer to reduce the HVAC cooling load. The μX was Tested first with a 20-segment thermal Manikin wearing summer clothing in a full-scale stainless-steel chamber and then with human participants in a climate chamber. Results show that the heat loss by the Manikin increased with the distance between the μX air supply diffuser and the Manikin and decreased with the clothing insulation. Changing the air delivery angle from 0° to 10° from the horizontal direction resulted in additional heat loss from the Manikin. The heat loss from the Manikin was found to be positively correlated with the supply air flow rate, but negatively correlated with the supply air temperature. However, the overall cooling efficiency dramatically increased with the supply air temperature. Overall, both the Manikin Test and the human participant Test showed that the μX was able to cool the occupant in a room of expanded temperature set-point, and the Clothing Independent Thermal Comfort Model gave a consistent prediction with the human participant Test. However, slight thermal discomfort was reported when the μX was used due to the effect of clothing, season, metabolic rate and local draught.
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micro environmental control for efficient local heating cfd simulation and Manikin Test verification
Building and Environment, 2019Co-Authors: Meng Kong, Thong Q Dang, Jianshun Zhang, Ezzat H KhalifaAbstract:Abstract Micro-environment control system has been proved to be able to provide local thermal comfort control. It also has the potential to save building energy by relaxing the control on the unoccupied space. This work aims at designing an efficient heating delivering device (HDD) to locally warm the person to restore thermal comfort when the unoccupied space temperature is reduced from 70.0 °F to 66.0 °F to save the energy. A three-stage approach was developed for designing the HDD including the initial stage of developing by CFD simulation, the second stage of Manikin Test verification and final stage of human subject Test confirmation. The results of the first two stages were presented and discussed in this work. It was shown that convective heating was not efficient enough unless a confinement box was used to hold the hot air around the legs and feet. A more ergonomically friendly design of using a foot warmer was finally proved to be a better solution for individually heating by both simulation and experiments since it can heat the occupant sufficiently. The ability of using CFD to predict heat loss from the clothed human body and its limitation was also investigated. It was found that with proper clothing insulation, the CFD can give a reasonable prediction, although simulating the clothing as a layer of certain thermal resistance might be problematic regarding the structure and permeability of the clothing material. A more appropriate method for simulating the clothing was needed for better prediction in the future.
Michael J Swickrath - One of the best experts on this subject based on the ideXlab platform.
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utilizing a suited Manikin Test apparatus and space suit ventilation loop to evaluate carbon dioxide washout
International Conference on Environmental Systems (ICES), 2015Co-Authors: Cinda Chullen, Bruce Conger, Adam Korona, Bryan Kanne, Summer Mcmillin, Thomas Paul, Jason Norcross, Jesus Delgado Alonso, Michael J SwickrathAbstract:NASA is pursuing technology development of an Advanced Extravehicular Mobility Unit (AEMU) which is an integrated assembly made up of primarily a pressure garment system and a portable life support subsystem (PLSS). The PLSS is further composed of an oxygen subsystem, a ventilation subsystem, and a thermal subsystem. One of the key functions of the ventilation system is to remove and control the carbon dioxide (CO2) delivered to the crewmember. Carbon dioxide washout is the mechanism by which CO2 levels are controlled within the space suit helmet to limit the concentration of CO2 inhaled by the crew member. CO2 washout performance is a critical parameter needed to ensure proper and robust designs that are insensitive to human variabilities in a space suit. A suited Manikin Test apparatus (SMTA) was developed to augment Testing of the PLSS ventilation loop in order to provide a lower cost and more controlled alternative to human Testing. The CO2 removal function is performed by the regenerative Rapid Cycle Amine (RCA) within the PLSS ventilation loop and its performance is evaluated within the integrated SMTA and Ventilation Loop Test system. This paper will provide a detailed description of the schematics, Test configurations, and hardware components of this integrated system. Results and analysis of Testing performed with this integrated system will be presented within this paper.
Faming Wang - One of the best experts on this subject based on the ideXlab platform.
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performance study of protective clothing against hot water splashes from bench scale Test to instrumented Manikin Test
Annals of Occupational Hygiene, 2015Co-Authors: Guowen Song, Faming WangAbstract:Hot liquid hazards existing in work environments are shown to be a considerable risk for industrial workers. In this study, the predicted protection from fabric was assessed by a modified hot liquid splash Tester. In these Tests, conditions with and without an air spacer were applied. The protective perfor mance of a garment exposed to hot water spray was investigated by a spray Manikin evaluation system. Three-dimensional body scanning technique was used to characterize the air gap size between the pro tective clothing and the Manikin skin. The relationship between bench scale Test and Manikin Test was discussed and the regression model was established to predict the overall percentage of skin burn while wearing protective clothing. The results demonstrated strong correlations between bench scale Test and Manikin Test. Based on these studies, the overall performance of protective clothing against hot water spray can be estimated on the basis of the results of the bench scale hot water splashes Test and the information of air gap size entrapped in clothing. The findings provide effective guides for the design and material selection while developing high performance protective clothing.
Thong Q Dang - One of the best experts on this subject based on the ideXlab platform.
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Micro-environmental control for efficient local cooling: Results from Manikin and human participant Tests
Building and Environment, 2019Co-Authors: Meng Kong, Thong Q Dang, Chetna Chianese, Teng Teng, Brian Carter, Alan Hedge, Jianshun Zhang, H. Ezzat KhalifaAbstract:Abstract The micro-environment in this study refers to the air space and environment around a person that directly impacts their thermal sensation. This study aims at evaluating the performance of a newly developed micro-environmental control system (μX) designed to cool the occupants locally for thermal comfort when the temperature in the ambient unoccupied space is raised from 23.9 °C to 26.1 °C in summer to reduce the HVAC cooling load. The μX was Tested first with a 20-segment thermal Manikin wearing summer clothing in a full-scale stainless-steel chamber and then with human participants in a climate chamber. Results show that the heat loss by the Manikin increased with the distance between the μX air supply diffuser and the Manikin and decreased with the clothing insulation. Changing the air delivery angle from 0° to 10° from the horizontal direction resulted in additional heat loss from the Manikin. The heat loss from the Manikin was found to be positively correlated with the supply air flow rate, but negatively correlated with the supply air temperature. However, the overall cooling efficiency dramatically increased with the supply air temperature. Overall, both the Manikin Test and the human participant Test showed that the μX was able to cool the occupant in a room of expanded temperature set-point, and the Clothing Independent Thermal Comfort Model gave a consistent prediction with the human participant Test. However, slight thermal discomfort was reported when the μX was used due to the effect of clothing, season, metabolic rate and local draught.
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micro environmental control for efficient local heating cfd simulation and Manikin Test verification
Building and Environment, 2019Co-Authors: Meng Kong, Thong Q Dang, Jianshun Zhang, Ezzat H KhalifaAbstract:Abstract Micro-environment control system has been proved to be able to provide local thermal comfort control. It also has the potential to save building energy by relaxing the control on the unoccupied space. This work aims at designing an efficient heating delivering device (HDD) to locally warm the person to restore thermal comfort when the unoccupied space temperature is reduced from 70.0 °F to 66.0 °F to save the energy. A three-stage approach was developed for designing the HDD including the initial stage of developing by CFD simulation, the second stage of Manikin Test verification and final stage of human subject Test confirmation. The results of the first two stages were presented and discussed in this work. It was shown that convective heating was not efficient enough unless a confinement box was used to hold the hot air around the legs and feet. A more ergonomically friendly design of using a foot warmer was finally proved to be a better solution for individually heating by both simulation and experiments since it can heat the occupant sufficiently. The ability of using CFD to predict heat loss from the clothed human body and its limitation was also investigated. It was found that with proper clothing insulation, the CFD can give a reasonable prediction, although simulating the clothing as a layer of certain thermal resistance might be problematic regarding the structure and permeability of the clothing material. A more appropriate method for simulating the clothing was needed for better prediction in the future.
Jianshun Zhang - One of the best experts on this subject based on the ideXlab platform.
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Micro-environmental control for efficient local cooling: Results from Manikin and human participant Tests
Building and Environment, 2019Co-Authors: Meng Kong, Thong Q Dang, Chetna Chianese, Teng Teng, Brian Carter, Alan Hedge, Jianshun Zhang, H. Ezzat KhalifaAbstract:Abstract The micro-environment in this study refers to the air space and environment around a person that directly impacts their thermal sensation. This study aims at evaluating the performance of a newly developed micro-environmental control system (μX) designed to cool the occupants locally for thermal comfort when the temperature in the ambient unoccupied space is raised from 23.9 °C to 26.1 °C in summer to reduce the HVAC cooling load. The μX was Tested first with a 20-segment thermal Manikin wearing summer clothing in a full-scale stainless-steel chamber and then with human participants in a climate chamber. Results show that the heat loss by the Manikin increased with the distance between the μX air supply diffuser and the Manikin and decreased with the clothing insulation. Changing the air delivery angle from 0° to 10° from the horizontal direction resulted in additional heat loss from the Manikin. The heat loss from the Manikin was found to be positively correlated with the supply air flow rate, but negatively correlated with the supply air temperature. However, the overall cooling efficiency dramatically increased with the supply air temperature. Overall, both the Manikin Test and the human participant Test showed that the μX was able to cool the occupant in a room of expanded temperature set-point, and the Clothing Independent Thermal Comfort Model gave a consistent prediction with the human participant Test. However, slight thermal discomfort was reported when the μX was used due to the effect of clothing, season, metabolic rate and local draught.
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micro environmental control for efficient local heating cfd simulation and Manikin Test verification
Building and Environment, 2019Co-Authors: Meng Kong, Thong Q Dang, Jianshun Zhang, Ezzat H KhalifaAbstract:Abstract Micro-environment control system has been proved to be able to provide local thermal comfort control. It also has the potential to save building energy by relaxing the control on the unoccupied space. This work aims at designing an efficient heating delivering device (HDD) to locally warm the person to restore thermal comfort when the unoccupied space temperature is reduced from 70.0 °F to 66.0 °F to save the energy. A three-stage approach was developed for designing the HDD including the initial stage of developing by CFD simulation, the second stage of Manikin Test verification and final stage of human subject Test confirmation. The results of the first two stages were presented and discussed in this work. It was shown that convective heating was not efficient enough unless a confinement box was used to hold the hot air around the legs and feet. A more ergonomically friendly design of using a foot warmer was finally proved to be a better solution for individually heating by both simulation and experiments since it can heat the occupant sufficiently. The ability of using CFD to predict heat loss from the clothed human body and its limitation was also investigated. It was found that with proper clothing insulation, the CFD can give a reasonable prediction, although simulating the clothing as a layer of certain thermal resistance might be problematic regarding the structure and permeability of the clothing material. A more appropriate method for simulating the clothing was needed for better prediction in the future.