Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (06): 153-159.doi: 10.13475/j.fzxb.20201004407

• Apparel Engineering • Previous Articles     Next Articles

Heat transfer modeling and experimental research of ventilation clothing in high-temperature outdoor environment

ZHAO Jingde1,2(), DING Yiran1,2, ZHANG Chunhong1,2   

  1. 1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
    2. Institute of Heating, Ventilation and Air Conditioning, Donghua University, Shanghai 201620, China
  • Received:2020-10-21 Revised:2021-01-28 Online:2021-06-15 Published:2021-06-28

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Abstract:

In order to improve the thermal comfort of workers in the high-temperature outdoor environment in summer, the heat transfer process between the clothing and the environment in the high-temperature outdoor environment was analyzed. Through the analysis on the heat transfer process among the human body, clothing and the environment, a heat transfer model of ventilated clothing in high-temperature outdoor environment exposed to the sunlight was established, which was validated through a human subjects experiment, where the ventilation clothing is analyzed for changes in underclothing space air parameters and in subjective reflections of the human subjects. The results show that the errors in heat gain and heat loss obtained using the model are only 9.1% compared to the experimental results, and the surface temperature of the body stabilizes in about 10 min. When the cooled air is supplied into the under clothing space, the temperature and humidity of the air in the space under clothing are lower than that not ventilated. The existence of forced convection greatly increases the evaporation rate of sweat on the body surface, and the subjective heat and skin moistness are significantly improved.

Key words: ventilation clothing, heat transfer model, under clothing ventilation, thermal sensation, high-temperature outdoor environment

CLC Number: 

  • TS941.16

Fig.1

Heat transfer model"

Tab.1

Basic information of personnel"

姓别 年龄/岁 身高/cm 体重/kg
男性 23±1 175±5 72.6±4.9
女性 23±1 167±5 56.0±3.0

Tab.2

Model and precision of experimental instrument"

仪器类别 型号 精度
温度传感器 SA1-T-72热敏电阻 ±0.2 Ω
温湿度计 AZ8706 ±0.6 ℃
±3% 相对湿度
热式风速仪 KANOMAX-KA23 0.01 m/s
电子秤 LQ-T2 ±1 g
太阳能功率计 TES-1333 ±10 W/m2

Fig.2

Percentage of different heat transfer pathways (Heat gain is positive, heat dissipation is negative)"

Fig.3

Changes of average human skin temperature over time"

Fig.4

Air temperature under clothes space at different conditions. (a) Without ventilation;(b) With ventilation"

Fig.5

Relative humidity of air under clothes space at different conditions. (a) Without ventilation;(b) With ventilation"

Fig.6

Gender differences in heat perception during ventilation"

Fig.7

Heat sensation vote in different situations. (a) Without ventilation;(b) With ventilation"

Fig.8

Skin wetness sensations under different conditions. (a) Without ventilation;(b) With ventilation"

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