Thermal Exchanges of Man at High Temperatures

Nelson, Norton A.; Eichna, Ludwig W.; Horvath, Steven M.; Shelley, Walter B.; Hatch, Theodore F.

doi:10.1152/ajplegacy.1947.151.2.626

Cited by 78 publications

(31 citation statements)

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“…The best line through the origin has a slope of 0446. Comparison between the present results for k6, 0, and those of Nelson et al (1947) 0, for (a) ke, (b, c) kc. The scale for kC is double that for ke.…”

Section: Resultsmentioning

confidence: 71%

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The effect of wind speed on maximum evaporative capacity in man

Clifford¹,

Kerslake²,

Waddell³

1959

The Journal of Physiology

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The rate of convective heat exchange between a man's skin and the surrounding air may be expressed as He = kc where Hc is the rate of heat transfer per unit area of skin, T8 is the mean skin temperatureTa the temperature of the air, and kc a coefficient depending on the air movement, the posture of the subject and his orientation to the wind. Exchange of heat by evaporation of sweat from the skin follows similar laws provided that the skin is completely wet with sweat, as happens when the rate of sweat production considerably exceeds the rate of evaporation. If the skin is not completely wet the rate of evaporation will be less, so that the fully wet condition corresponds to the maximum rate of evaporation. Under conditions of incomplete wetness, the concept of maximum evaporative capacity remains useful, since the degree of skin wetness may be expressed as the ratio of the observed rate of evaporation to the maximum possible. For completely wet skin, then, He = ke(Es -Ea),where He is the rate of heat transfer by evaporation, E8 is the vapour pressure at the skin surface (approximately saturation at T8),Ea is the water vapour pressure in the ambient air, and ke a coefficient analogous to kc and depending on the same factors.Where the areas available for heat exchange by convection and by evaporation are equal, it is to be expected that kc and ke will bear a constant ratio to one another, since both may be regarded as depending in part on the thickness

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Section: Resultsmentioning

confidence: 71%

“…Previous determinations of the relation between wind speed and ke and kc have given results inconsistent with this. Nelson, Eichna, Horvath, Shelley & Hatch (1947) measured both coefficients at a series of different wind speeds.…”

mentioning

confidence: 99%

The effect of wind speed on maximum evaporative capacity in man

Clifford¹,

Kerslake²,

Waddell³

1959

The Journal of Physiology

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show abstract

“…The estimation of storage is only approximate, and we cannot be certain of the values for the physical constants of heat transfer by radiation and convection, as we must rely on average values for men studied in the rather. different conditions of the experiments of Nelson, Eichna, Horvath, Shelley & Hatch (1947).…”

Section: Criteria Of Acclimatizationmentioning

confidence: 99%

Natural and artifical acclimatization to hot environments

Hellon¹,

Jones²,

MacPherson³

et al. 1956

The Journal of Physiology

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“…No attempt has been made in this overall treatment to separate convective and radiant heat exchange; one method for such separation has been applied to these data (4). All creasing the heat load or wearing clothing led to elevations in the sweating rate, heart rate, rectal and skin temperatures.…”

Section: Methodsmentioning

confidence: 99%