Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (10): 139-145.doi: 10.13475/j.fzxb.20200908507

• Apparel Engineering • Previous Articles     Next Articles

Cooling capacity of personal ventilation systems in different environments

WU Guoshan1,2, LIU Heqing1(), WU Shixian1,2, YOU Bo1, SONG Xiaopeng2   

  1. 1. School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
    2. School of Energy and Building Environment Engineering, Guilin University of Aerospace Technology, Guilin, Guangxi 541004, China
  • Received:2020-09-30 Revised:2021-06-17 Online:2021-10-15 Published:2021-10-29
  • Contact: LIU Heqing E-mail:hqliu8222638@163.com

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Abstract:

In different thermal environment and human metabolic rate, the cooling capacity of personal ventilation system (PVS) is unclear. According to the relationship between skin temperature and metabolic rate, rectal temperature and environmental parameters, the calculation model of cooling capacity was established based on the method of enthalpy difference between the inlet and outlet air of PVS. The cooling capacity of PVS were calculated when the temperature was 30-40 ℃, the humidity was 0-100% and the air flow is 10-40 m3/h, the metabolic rate were 210 W/m2 (heavy labor) and 145 W/m2 (moderate labor) respectively. According to the calculation results, the contour maps of cooling capacity of PVS under different metabolic rate and thermal environment were drawn. It was found that the higher the ambient temperature and the humidity was, and the smaller the cooling capacity was. In the high temperature and humidity environment, the cooling capacity of PVS may become zero or negative. The air flow only affects the absolute value of cooling capacity. The larger the air flow was, the larger the absolute value of cooling capacity was. When the environmental parameters and ventilation were constant, the higher the metabolic rate of the human body, the greater the cooling capacity of PVS. When the metabolic rate of the human body and environmental parameters are known, the cooling capacity of PVS can be calculated according to this method.

Key words: personal ventilation system, cooling capacity, hot environment, thermal comfort

CLC Number: 

  • TB18

Fig.1

Schematic diagram of personal ventilation system"

Fig.2

Cooling capacity changes of PVS in different ambient temperature and humidity when body's metabolic rate was 145 W/m2"

Fig.3

Cooling capacity changes of PVS in different ambient temperature and humidity when the body's metabolic rate was 210 W/m2"

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