The Solar Radiation Area of Man

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Abstract
The amount of solar energy incident upon the body surface can be calculated if the intensity of the beam and the area of the body projected sunwards are known. A photographic method is described which has been developed for the measurement of the areas of the body in the standing posture which are projected in a direction normal to the solar rays. Twenty-five male and 25 female subjects were studied, whose surface areas ranged from 1·30 m2 to 2·20 m2. The effective radiating areas are related to the surface area of the body and this relationship is substantially independent of body size and shape. An equation has been found which enables the radiating area to be computed for any angle of altitude and orientation of the body with respect to the direction of the sun.

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