Air movement and heat loss from sheep. III. Components of insulation in a controlled environment

Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character
A J McArthur

Abstract

The rate of sensible heat loss from a Clun Forest ewe was studied at several fleece depths in a temperature-controlled chamber. A simple resistance analogue was used to describe the heat flow from different body regions. Heat loss from the trunk depends largely on the mean fleece depth l. The fleece resistance was about 1.5 s cm-1 per centimetre depth. Heat transfer through the fleece was accounted for by molecular conduction, thermal radiation and free convection. The fleece conductivity -kb attributed to free convection depends on the mean temperature difference (-Tst---Tct) across the fleece according to the relation -kb = 8.0 (-Tst---Tct)0.53. Estimates of the sensible heat flux from the trunk at environmental temperatures, Ta, between 0 and 30 degrees C range from about 8 W (l = 7.0 cm, Ta = 30 degrees C) to about 160 W (l = 0.1 cm, Ta = 0 degrees C). In contrast, the sensible heat loss from the legs depends mainly on the local tissue resistance. For environmental temperatures between 0 and 30 degrees C, the calculated tissue resistance for this region of the body varied from about 8 to 1 s cm-1. The corresponding heat loss from the legs was between 10 and 20 W, compared with between 3 and 7 W from the head. The fastest he...Continue Reading

References

Mar 11, 1975·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·K Cena, J L Monteith
Mar 11, 1975·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·K Cena, J L Monteith
Nov 1, 1973·Journal of Applied Physiology·J A ClarkJ L Monteith
Aug 1, 1965·The Journal of Physiology·J M BrockwayJ D Pullar
Aug 13, 1980·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·A J McArthur, J L Monteith
Aug 13, 1980·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·A J McArthur, J L Monteith
Jan 1, 1964·The British Journal of Nutrition·J P JOYCE, K L BLAXTER

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Citations

Jan 1, 1985·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·K E Conley, W P Porter
Apr 21, 2011·Tropical Animal Health and Production·Serdal DikmenHakan Ustuner
May 21, 1987·Journal of Theoretical Biology·A J McArthur

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