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Heat storage, not sensible heat loss, increases in high temperature, high humidity conditions

Published online by Cambridge University Press:  18 September 2007

Shane K. Maloney
Shane K. Maloney
Affiliation:
School of Biological Science, University of New South Wales, Sydney 2052, Australia
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Abstract

Because evaporative cooling is the principal avenue of heat loss at high ambient temperatures, high humidity superimposed on high temperature presents poultry with an additional thermal challenge. Whenever body temperature exceeds ambient temperature, sensible heat loss (radiation, conduction, and convection) to the environment will occur. The generally accepted model of heat balance, which states that when ambient temperature increases homeotherms will endeavour to maximize sensible heat loss before resorting to evaporative heat loss, was recently challenged. However, several factors that can influence heat balance were not considered in the reasoning pursued in that challenge. In this paper the theory behind heat balance models is discussed and the data that were used to challenge the model are reanalysed. The question of whether poultry are capable of physiologically increasing sensible heat loss under hot, humid conditions remains unanswered and presents an area worthy of future study.

Keywords

dry conductanceevaporative heat losshumiditypoultrysensible heat losstemperature
Type
Research Article
Information
World's Poultry Science Journal , Volume 54 , Issue 4 , December 1998 , pp. 347 - 352
Copyright
Copyright © Cambridge University Press 1998

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