PMID: 9173040Apr 1, 1997Paper

Thermal resistance parameters of the air environment at various altitudes

International Journal of Biometeorology
I M Kandjov

Abstract

The thermal properties of atmospheric air surrounding the human body at various altitudes are characterized with a system of parameters. This system comprises resistance of the air to convective heat transfer h(c)(-1), degrees C (W/m2)(-1) and to water vapour transfer h(D)(-1), s/m. The concept of 'evaporative resistance' h(e)(-1), hPa (W/m2)(-1) following the similarity of the processes is introduced. In obtaining the altitude dependencies of investigated parameters, a respective heat transfer equation expressing the rate of heat exchange at the boundary body surface-ambient air is applied. The use of the body thermal state of the established attitude dependencies is discussed. The concept of 'thermal stability' related to the evaporative resistance parameter h(e)(-1)is introduced. This parameter is assumed as: (1) an indicator of the human body thermal stability and (2) distributor and predictor of environmental influence on the body thermal state.

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