Mist spraying systems can relieve thermal discomfort in extremely hot weather. However, the thermal effect of the mist spraying system on the human body has not been investigated sufficiently. To understand a physical phenomenon between human and surrounding environment, and physiological responses of the human body in mist spraying environment, the thermal state of the human body were predicted using the 2-node model (2NM). Sixty-five subjects' skin temperatures and four environmental factors (air temperature, mean radiation temperature, relative humidity, and airspeed) were measured simultaneously. The mist spraying system caused the surrounding temperature to fall by 3.6 ± 1.4 °C and relative humidity to rise by 15.9 ± 4.7%. In addition, when the overall skin temperature was predicted using the conventional 2NM with measured environmental factors as an input parameter, the skin temperature was increased in mist spraying environment as opposed to the subject experimental results. However, when the mist wettedness is additionally considered in the thermoregulation human model, the decreasing skin temperature in the mist spraying environment was predictable considering the heat loss of the mist particles evaporated from the body surface. The mean error between the predicted and the experimental results showed a result of 0.4 °C. In conclusion, it was found that the mist wettedness is a key factor to predict human thermal conditions in the mist spraying environment accurately.
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