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J Appl Physiol 63: 1374-1380, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 63, Issue 4 1374-1380, Copyright © 1987 by American Physiological Society

ARTICLES

A graphic analysis of respiratory heat exchange

P. Varene and C. Kays
Laboratoire de Physiologie, Universite de Bordeaux-II, France.

A new graphic representation of respiratory heat exchange is proposed using the concept of equivalent temperatures directly related to enthalpy values. On such a diagram it is possible to 1) compute the value of the heat exchange (delta H) knowing the inspired temperature (TI) and the partial pressure of water vapor (PIH2O) [or the relative humidity (rhI)] of inspired gas; 2) estimate the variation in delta H following a given variation in TI and PIH2O or, inversely, to choose the variation in TI and PIH2O necessary to obtain a given variation in delta H; 3) dissociate inspiratory and expiratory exchanges and to evaluate the efficiency of the respiratory heat exchange process in different environmental situations; and 4) easily compare the results of different studies published on respiratory heat exchanges in humans or other animal species.




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