Experimental research on suitable air velocity corresponding to different temperatures in hot and humid environment in summer

Increasing the air velocity in a certain temperature environment can improve the thermal comfort of the human body and reduce energy consumption, but the effect of increasing the air velocity on the thermal comfort of the human body is reduced at a higher temperature. In order to explore the compensation effect of air velocity on the temperature in a hot and humid environment, and propose the suitable air velocity value, this paper systematically studies the positive improvement effect and efficiency of air velocity in the temperature range from partial heat to high temperature in the high humidity environment (80% relative humidity). By creating four temperature levels (28,30,32,34 ℃) in the artificial climate room, using a floor fan to blow the air from the front and controlling the air velocity from 0.8 m/s to 1.4 m/s, the thermal comfort experiments of 168 subjects under 8 working conditions are completed, and the subjective feelings and physiological responses of the subjects are obtained. The prediction and evaluation model between the overall thermal sensation and temperature and air velocity is established, and the comfortable air velocity corresponding to different temperatures in the thermal neutral state is obtained. At 32 ℃ and 34 ℃, increasing the wind speed cannot make the subjects reach the thermal comfort state, but it can still improve the thermal sensation and skin temperature. Furthermore, it is proposed to use the average skin temperature change rate to evaluate the blowing efficiency at different air velocities to obtain the effective air velocity value at the corresponding temperature. Combining the comfortable air velocity with the effective air velocity, the recommended values of suitable air velocity at different temperatures in a hot and humid environment in summer are obtained.