173. Comparing Thermal Manikin and Physiological Testing Results to Assess the Performance of Liquid Cooling Garments

2004 ◽  
Author(s):  
K. Semeniuk ◽  
J. Dionne ◽  
A. Makris ◽  
T. Bernard ◽  
C. Ashley ◽  
...  
Keyword(s):  
Thermal Manikin ◽  
Liquid Cooling ◽  
Cooling Garments

A Statistical Study to Evaluate the Performance of Liquid Cooling Garments Considering Thermal Comfort

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Weicheng Shu ◽  
Jiawen Wang ◽  
Xinfeng Zhang ◽  
Xiaobing Luo
Keyword(s):  
Thermal Comfort ◽  
Optimization Design ◽  
Working Time ◽  
Orthogonal Experimental Design ◽  
Thermal Manikin ◽  
Inlet Temperature ◽  
Liquid Cooling ◽  
Time Ratio ◽  
Key Factor ◽  
Cooling Garments

Abstract Liquid cooling garments (LCGs) are considered feasible cooling equipment to protect individuals from hyperthermia and heat-related illness when working in extremely hot and stressful environments. So far, the goals for the optimization design of LCGs are mostly from the perspective of enhancing its efficiency and working time. However, thermal comfort is the key factor that is often not considered. In fact, many situations may cause discomfort. For example, the inlet temperature of the liquid-cooling vest changes constantly resulting in the change of thermal states of the human body. So, it is very significative to develop a method to evaluate the performance of LCGs considering thermal comfort. In this paper, an uncomfortable time ratio was proposed to evaluate the performance of LCGs considering thermal comfort. A series of tests were conducted by a modified thermal manikin method to evaluate the thermal properties. According to the analyses, the duration working time was 82.77 min, while the uncomfortable time ratio was too large, up to 57.6%. It showed that the thermal comfort should be considered when optimizing the performance of LCGs. The influences of different parameters such as volume of ice, flowrate, inlet temperature on the performance of LCGs were investigated through orthogonal experimental design. The statistical analysis illustrated that the influence of the volume of ice on the uncomfortable time ratio is greater than that of flowrate and ambient temperature. It is concluded that this method is useful for the control and design of LCGs considering thermal comfort.

A Statistical Study to Evaluate the Performance of Liquid Cooling Garments Considering Thermal Comfort

2019 ◽  
Author(s):  
Weicheng Shu ◽  
Jiawen Wang ◽  
Xinfeng Zhang ◽  
Xiaobing Luo
Keyword(s):  
Thermal Comfort ◽  
Optimization Design ◽  
Working Time ◽  
Orthogonal Experimental Design ◽  
Thermal Manikin ◽  
Inlet Temperature ◽  
Liquid Cooling ◽  
Time Ratio ◽  
Key Factor ◽  
Cooling Garments

Abstract Liquid cooling garments (LCGs) are considered a feasible cooling equipment to protect individuals from hyperthermia and heat-related illness when working in extremely hot and stressful environments. So far, the goals for optimization design of LCGs are mostly from the perspective of enhancing its efficiency and duration working time. However, thermal comfort is the key factor which is often not considered. In fact, there are many situations that may cause discomfort. For example, as the ice melts, the inlet temperature of the liquid cooling vest changes constantly resulting in the change of thermal states of the human body, which lead to discomfort of human. So, it is very significative to develop a method to evaluate the performance of LCGs considering thermal comfort. In this paper, an uncomfortable time ratio was proposed to evaluate the performance of LCGs considering thermal comfort. It defined the proportion of uncomfortable time including overcooling and overheating in the entire working time. Series of tests were conducted by a modified thermal manikin method to evaluate the thermal properties. According to the analyses, the duration working time was 82.77 min, while the uncomfortable time ratio was too large, up to 57.6 %. It showed that the requirement of comfort should be considered when optimizing the performance of LCGs. The influences of different parameters such as the volume of ice, flowrate, inlet temperature on the performance of LCGs were investigated through orthogonal experimental design. The statistical analysis illustrated that the influence of the volume of ice on the uncomfortable time ratio is greater than that of flowrate and ambient temperature. It is concluded that this method is useful for the control and design of LCGs considering thermal comfort.

Simulation of Efficiency of Liquid Cooling Garments

2011 ◽  
Vol 331 ◽  
pp. 636-639
Author(s):  
Ming Wei Tian ◽  
Su Kang Zhu ◽  
Ning Pan
Keyword(s):  
Dynamic Equilibrium ◽  
Three Dimensional ◽  
Characteristic Parameter ◽  
Thermal Manikin ◽  
Liquid Cooling ◽  
Effective Form ◽  
Equilibrium Level ◽  
Cooling Effects ◽  
Cooling Garment ◽  
Cooling Garments

Liquid cooling garment (LCG) is treated as one kind of effective form-fitting garment applied to remove and release extra heat efficiently from human body whose internal temperature can be easily maintained at a safe dynamic equilibrium level under the severe boundary conditions. In this paper, firstly, two specialized types of liquid cooling garments, wrapped around thermal manikin, are designed as the three-dimensional heat-flux coupling models that are solved numerically using a finite element method, and then the effective cooling temperatures of the thermal manikin skin are proposed as the characteristic parameter to evaluate the cooling effects of these garments. Finally, A comparison of thus effective cooling temperature with the experiment data from the existing reference are shown that this simulation model develops very reliable results for the heat transfer between liquid cooling garments and thermal manikin.

A Novel Elastomer Simulated Skin Applied in Measurement of Extravehicular Liquid Cooling Garment

2011 ◽  
Vol 239-242 ◽  
pp. 908-911
Author(s):  
Kai Yang ◽  
Ming Li Jiao
Keyword(s):  
Natural Rubber Latex ◽  
Thermoplastic Elastomer ◽  
Ethylene Vinyl Acetate ◽  
Fuzzy Decision Making ◽  
Thermal Manikin ◽  
Liquid Cooling ◽  
Series Of Experiments ◽  
Cooling Garment ◽  
Heat Property ◽  
Fuzzy Mathematic

A novel thermoplastic elastomer was applied in the measurement of extravehicular liquid cooling garment and the satisfying result in improving the heat dissipating capacity of liquid cooling garment was achieved. Firstly, five kinds of elastomer were selected, which were ethylene-vinyl acetate copolymer (EVA), high temperature vulcanized silicone rubber (HTV), medical used silicon rubber (MSR), natural rubber latex (NRL) and thermoplastic SBS complex (TPR). To evaluate the synthetic performance of these materials, a series of experiments characterizing material’s mechanical and thermodynamic properties was performed, including tensile and compression test, heat property test and so on. Meanwhile, fuzzy mathematic method was employed to get parameters’ weight distribution, and then fuzzy decision-making method was adopted to perform synthetic evaluation, which showed that TPR had satisfying optimization performance and can be used as simulated skin in thermal manikin. Finally, to verify the function of TPR simulated skin, comparative experiments were performed in climate chamber when thermal manikin covered with TPR simulated skin and did not cover with TPR simulated skin. Results show that TPR simulated skin can effectively improve the heat dissipating capacity of liquid cooling garment.

Comparison of Shortened and Standard Liquid Cooling Garments to Provide Physiological and Subjective Comfort During EVA

2004 ◽  
Author(s):  
Victor S. Koscheyev ◽  
Gloria R. Leon ◽  
Aitor Coca ◽  
Jinny Ferl ◽  
David Graziosi
Keyword(s):  
Liquid Cooling ◽  
Cooling Garments

EFFICACY OF LIQUID COOLING GARMENTS TO MINIMIZE HEAT STRAIN DURING SPACE SHUTTLE DEORBIT AND LANDING.

1999 ◽  
Vol 31 (Supplement) ◽  
pp. S305 ◽  
Author(s):  
D. W. Rimmer ◽  
D-J. Dijk ◽  
J. M. Ronda ◽  
R. Hoyt ◽  
J. A. Pawelczyk
Keyword(s):  
Space Shuttle ◽  
Heat Strain ◽  
Liquid Cooling ◽  
Cooling Garments

scholarly journals Using a Sweating Manikin, Controlled by a Human Physiological Model, to Evaluate Liquid Cooling Garments

2005 ◽  
Author(s):  
Robert Farrington ◽  
John Rugh ◽  
Desikan Bharathan ◽  
Heather Paul ◽  
Grant Bue ◽  
...  
Keyword(s):  
Physiological Model ◽  
Liquid Cooling ◽  
Cooling Garments

Subjective Perception of Thermal and Physical Comfort in Three Liquid Cooling Garments

2009 ◽  
Author(s):  
Gloria R. Leon ◽  
Victor S. Koscheyev ◽  
Birgit Fink ◽  
Paul Ciofani ◽  
Joe Warpeha ◽  
...  
Keyword(s):  
Subjective Perception ◽  
Liquid Cooling ◽  
Physical Comfort ◽  
Cooling Garments
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