Direct Determination of Local Evaporative Heat Transfer Coefficientsby Simultaneous Measurement of Local Sweat Rate and Evaporation Rate

摘要

In this study, local evaporation rates (msk) at chest, front thigh and forearm were measured with local calorimeters and local sweat rates (msw) were simultaneously measured with ventilated capsules at the same regions while a subject was exposed to the heat (46-48°C) for one hour. During the first 30-40 minutes, msk increased progressively with msw and became appreciably less than msw after the skin region was fully wetted with sweat. Thus, the critical msk value can be clearly identified during the heat exposure so as to determine local evaporative heat transfer coefficients. The results showed that the he values for chest, front thigh and forearm were 5.5, 6.1 and 7.3 (kcal/m2.h.mmHg), respectively.