ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Study of a Portable Microclimate Cooling System Based on Vapor Compression Refrigeration Cycle
Received date: 2013-01-18
Revised date: 2013-03-18
Online published: 2013-03-19
Supported by
AVIC Innovation Fund
A man-portable microclimate cooling system for personal cooling in high temperature circumstances is developed to solve the heat stress problems for helicopter and armored vehicle crewmen. The system is based on a vapor compression refrigeration cycle and the refrigerant used is R134a. The dimensions of the system are 190 mm× 190 mm× 100 mm and the weight is only 2.75 kg. It can be powered by a lithium ion battery or with DC power supply. It utilizes a new miniature DC compressor and a miniature electronic expansion valve (EXV) which operates in a pulse width modulation mode. A miniature microchannel plate type evaporator is developed and an aluminum microchannel condenser is applied. By utilizing the above components of small scale and high efficiency, the whole system realize the miniaturization and practicality of vapor compression refrigeration systems. Experiments are carried out in both fixed and variable speed modes to investigate the effects of EXV duty cycle and refrigerant charge amount on the cooling performance. The results show that the system has a cooling capacity of 260 W under the ambient temperature of 45 ℃ and water temperature of 20 ℃, which is sufficient for cooling one person under a high work load. And the cooling coefficient of performance (COP) reaches highest when the EXV operates at 45% of its duty cycle with a refrigerant charge amount of 120 g.
YANG Yufei , YUAN Weixing , YANG Bo , LIAO Yibing . Study of a Portable Microclimate Cooling System Based on Vapor Compression Refrigeration Cycle[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(11) : 2500 -2509 . DOI: 10.7527/S1000-6893.2013.0171
[1] Hancock P A,Vercruyssen M.Limits of behavioral efficiency for workers in heat stress.International Journal of Industrial Ergonomics,1988,3(2): 149-158.
[2] Hancock P A,Vasmatzidis I.Effects of heat stress on cognitive performance: the current state of knowledge.International Journal of Hyperthermia,2003,19(3): 355-372.
[3] Cheung S S.Neuromuscular response to exercise heat stress.Medicine and Sport Science,2008,53: 39-60.
[4] Nybo L.Exercise and heat stress: cerebral challenges and consequences.Progress in Brain Research,2007,162: 29-43.
[5] Kong F K,Liu F.Military vehicle application engineering.Beijing: National Defense Industry Press,1993: 368-369.(in Chinese) 孔繁柯,刘馥.军用车辆运用工程.北京: 国防工业出版社,1993: 368-369.
[6] Singh A P,Majumdar D,Bhatia M R,et al.Environmental impact on crew of armoured vehicles: effects of 24 h combat exercise in a hot desert.International Journal of Biometeorology,1995,39(2): 64-68.
[7] Hanna M.LAV Ⅲ climate room solar testing.National Research Council Task Report 54-A5027,2006.
[8] Havenith G,Hartog E D,Martini S.Heat stress in chemical protective clothing: porosity and vapour resistance.Ergonomics,2011,54(5): 497-507.
[9] Guo X M,Yuan X G.Heat stress problem and solution of tank & armored vehicle crewmen.Acta Armamentarii,2009,30(11): 1527-1532.(in Chinese) 郭新梅,袁修干.坦克、装甲车乘员热应激问题的解决方案.兵工学报,2009,30(11): 1527-1532.
[10] Speckman K L,Allan A E,Sawka M N.Perspectives in microclimate cooling involving protective clothing in hot environments.International Journal of Industrial Ergonomics,1988,3(2): 121-147.
[11] Vallerand A,Michas R,Frim J,et al.Heat balance of subjects wearing protective clothing with a liquid-or air-cooled vest.Aviation,Space,and Environmental Medicine,1991,62(5): 383-391.
[12] McLellan T M,Frim J,Bell D G.Efficacy of air and liquid cooling during light and heavy exercise while wearing nbc clothing.Aviation,Space,and Environmental Medicine,1999,70(8): 802-811.
[13] Yang Y,Stapleton J,Diagne B T,et al.Man-portable personal cooling garment based on vacuum desiccant cooling.Applied Thermal Engineering,2012,47: 18-24.
[14] Hunter I,Hopkins J T,Casa D J.Warming up with an ice vest: core body temperature before and after cross-country racing.Journal of Athletic Training,2006,41(4): 371-374.
[15] Sarier N,Onder E.Organic phase change materials and their textile applications: an overview.Thermochimica Acta,2012,540(20): 7-60.
[16] Cotter J D,Sleivert G G,Roberts W S,et al.Effect of pre-cooling,with and without thigh cooling,on strain and endurance exercise performance in the heat.Comparative Biochemistry and Physiology Part A: Molecular and Integrative Physiology,2001,128(4): 667-677.
[17] Gu X Q.A status report on research of passvie cooling vests on US Navy ships.Navy Medicine Magzine,2004,26(6): 191-193.(in Chinese) 顾心清.美海军舰艇被动式降温背心的研究现状.海军医学杂志,2004,26(6): 191-193.
[18] Wu Y T,Ma C F,Zhong X H.Development and experimental investigation of a miniature-scale refrigeration system.Energy Conversion and Management,2010,51(1): 81-88.
[19] Elbel S,Bowers C D,Zhao H,et al.Development and analysis of miniature vapor compression cooling technology.23rd International Congress of Refrigeration (ICR2011),2011.
[20] Drost M K,Friedrich M.Miniature heat pumps for portable and distributed space conditioning applications.AIChE 1997 Spring National Meeting,1997.
[21] Sathe A A,Groll E A,Garimella S V.Experimental evaluation of a miniature rotary compressor for application in electronics cooling.International Compressor Engineering Conference at Purdue,2008.
[22] Brandner J J,Anurjew E,Bohn L,et al.Concepts and realization of microstructure heat exchangers for enhanced heat transfer.Experimental Thermal and Fluid Science,2006,30(8): 801-809.
[23] Chang Y P,Tsai R,Hwang J W.Condensing heat transfer characteristics of aluminum flat tube.Applied Thermal Engineering,1997,17(11): 1055-1065.
[24] Kim M H,Bullard C W.Air-side thermal hydraulic performance of multi-louvered fin aluminium heat exchangers.International of Journal of Refrigeration,2002,25(3): 390-400.
[25] Wang W W,Radcliff T D,Christensen R N.A condensation heat transfer correlation for millimeter-scale tubing with flow regime transition.Experimental Thermal and Fluid Science,2002,26(5): 473-485.
[26] ASHRAE.Standard 41.2-1987 Standard methods for laboratory airflow measurement.Atlanta: ASHRAE,1992.
/
| 〈 |
|
〉 |
CJA