Abstract
Cooling garments are gradually becoming a simple and energy-saving way to relieve the human body from thermal stress. In this article, we built a set of cooling garment prototypes based on thermoelectric cooling. A series of performance tests were carried out in a simulated high-temperature environment to select the appropriate refrigerant and on this basis to determine the best inlet temperature that can meet the refrigeration requirements of personnel. The experimental results show that water and 40% glycerin have own advantages as refrigerants. The energy utilization efficiency of the cooling garment is higher when water is used as the refrigerant and the average cooling effect is better when 40% glycerol is used as the refrigerant. The higher the energy utilization efficiency, the relatively small battery capacity required by the liquid cooling garment, so water is selected as the refrigerant in this article. The effective cooling power can reach 210 W when the ambient temperature is 35 degrees C, and the maximum coefficient of performance at this time is 3.3. Through the wear experiments, we determined that the optimal water inlet temperature when the ambient temperature is 35 degrees C is 22 degrees C, which reduces the average temperature in the microclimate area to about 28.5 degrees C, and the relative humidity in the microclimate area is reduced from 90% to 58%, which proves the effectiveness of wearing this cooling garment to improve the thermal comfort of the human body. In addition, it is found that the inlet temperature of the cooling garment has a critical value at 22-24 degrees C when the ambient temperature is 35 degrees C. The water inlet temperature near this critical value has a more significant change in the cooling effect.
NSTL
Elsevier