A correct enthalpy relationship as thermal comfort index for livestock.
Researchers working with thermal comfort have been using enthalpy to measure thermal energy inside rural facilities, establishing indicator values for many situations of thermal comfort and heat stress. This variable turned out to be helpful in analyzing thermal exchange in livestock systems. The animals are exposed to an environment which is decisive for the thermoregulatory process, and, consequently, the reactions reflect states of thermal comfort or heat stress, the last being responsable for problems of sanity, behavior and productivity. There are researchers using enthalpy as a qualitative indicator of thermal environment of livestock such as poultry, cattle and hogs in tropical regions. This preliminary work intends to check different enthalpy equations using information from classical thermodynamics, and proposes a direct equation as thermal comfort index for livestock systems.
Rodrigues
Valéria Cristina
VC
University of São Paulo, Sao Paulo, Brazil. vcrodrig@esalq.usp.br
da Silva
Iran José Oliveira
IJ
Vieira
Frederico Márcio Corrêa
FM
Nascimento
Sheila Tavares
ST
D000818:Animals; D001833:Body Temperature Regulation; D002417:Cattle; D006358:Hot Temperature; D058751:Livestock / Q000145:classification / Q000502:physiology*; D011200:Poultry; D013312:Stress, Physiological; D013552:Swine; D013816:Thermodynamics; D013697:Thermosensing / Q000502:physiology*