The physical and engineering properties of inanimate objects as heat exchangers have been the subject of long study. Within the past 25 years, many factors have brought biological disciplines into intimate contact with the formally similar problem of heat exchange between a living body and its environment. A Committee on Biotechnology of the Heat Transfer Division of this Society has been organized recently with the intention of advancing and standardizing useful engineering descriptions of biological heat-exchange problems. Such problems presently complicate engineering design in which the human link is a critical element in total function of man and machine. The paper demonstrates that a large body of calorimetric data on the human heat exchanger can be summarized in statistically derived empirical equations. These equations obviate the need for special physiological knowledge required of the engineer who would make such computations from the classical equations of heat loss.

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