To study the influences of phase change material(PCM)microcapsules in clothing on human thermal responses,a mathematical model is developed.The improved Stolwijk’s model is used to simulate human thermo-regulatory process,and the coupled heat and moisture transfer including the moisture sorption/desorption of fibers and effects of phase transition temperature range on the phase change processes of the PCM is considered in clothing model.Meanwhile,the theoretical predictions are validated by experimental data.Then,the interactions between human body thermal responses and the heat and moisture transfer in clothing are discussed by comparing the prediction results with PCMs and without PCMs.Also the effects of fiber hygroscopicity on clothing and human thermal responses are compared.The conclusion shows that the clothing with PCMs microcapsules can delay the human temperature variations and decrease the sweat accumulation rate on the skin surface and heat loss during changing of ambient conditions,and fiber hygroscopicity reduces the effect of PCM microcapsules on delaying garment temperature variations very significantly.
Transactions of Nanjing University of Aeronautics & Astronautics
the National Natural Science Foundation of China(No.50706017)
the Research Funds of Nanjing University of Aeronautics and Astronautics(No.NS2010009).
LIU Wenyi reveived her B.S.degree from Nanjing University of Aeronautics and Astrounatics,Nan-jing,China,in 2014.From 2014,she worked at Nanjing En-gineering Institute of Aircraft Systems,AVIC as an engineer in intelligence research.Her research focuses on the ad-vanced technology in aircraft electro-mechanical field;LI Fengzhi reveived B.S.and Ph.D.degrees from Da-lian University of Technology,Dalian,China,in 1998 and 2004,respectively.In 2006,he joined College of Aerospace Engineering,Nanjing University of Aeronautics and Astro-nautics and his main research fields are environmental control system,human heat regulatory and porous medium heat transfer;Corresponding author,LIU Weihua received B.S.,M.S.and Ph.D.degrees from Xi’an Jiaotong University,Xi’an,China,in 1985,1988 and 2000,respectively.In 2002,he joined College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics and his main research fields are environmen-tal control system and fuel system.E-mail address:email@example.com.