THE SOLAR HEAT LOAD: ITS RELATIONSHIP TO TOTAL HEAT LOAD AND ITS RELATIVE IMPORTANCE IN THE DESIGN OF CLOTHING 12

Abstract

The solar heat load received by man is estimated and compared with the metabolic heat load. Methods of determining the effect of clothing on the solar heat load are considered. Physiologic detns. either indoors or out of doors are not trustworthy. It is impossible to simulate in the laboratory, either sunlight or conditions of exposure to sunlight. Variables entering into outdoor expts. may lead to misinterpretation. Physical measurements of reflection of sunlight by fabrics should give best estimate of their effectiveness in reducing solar heat load. Various routes of heat gain and loss out of doors are considered.