Abstract
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.
This is a preview of subscription content, log in via an institution to check access.
References
Albright LD (1990) Environment control for animals and plants. ASAE Textbook, 4. American Society of Agricultural Engineers Michigan, St. Joseph
ASHRAE (1993) ASHRAE handbook—fundamentals, [chapters 6 and 8]
Barbosa Filho JAD, Silva MAN, Vieira FMC, Silva IJO (2006) Avaliação direta e prática. Avic Ind 4(1144):54–57
Barbosa Filho JAD, Silva MAN, Vieira FMC, Silva IJO (2007) Avaliação Direta e Prática - Caracterização do Ambiente Interno de Galpões de Criação de Frangos de Corte Utilizando Tabelas Práticas de Entalpia. Avic Ind 1144:54–57
Berry, Bollay E, Beers NR (1945) Handbook of Meteorology. McGraw-Hill, New York, p 1068
Buffington DE (1977) Black globe-humidity comfort index for dairy cows. In: Winter meeting of the American Society of Agricultural Engineers, St Joseph, 1977. Trans Am Soc Agric Eng p 4517
Çengel YA, Boles MA (2001) Thermodynamics: An Engineering Approach. McGraw-Hill, New York
Chu CM, Jong TL (2008) Enthalpy estimation for thermal comfort and energy saving in air conditioning system. Energy Convers Manage 49:1620–1628
Chu CM, Jong TL, Huang YW (2005) A study of thermal comfort control using least enthalpy estimator on HVAC system. In: 24th American control conference, pp 3665–3670
Esmay ML (1982) Principles of Animal Environment. Avi Publishing, Westport
Fairey PW (1994) “Passive Cooling and Human Comfort”. FSEC Publication DN-5, University of Florida
Furlan RA (2001) Avaliação da nebulização e abertura de cortinas na redução da temperatura do ar em ambiente protegido.146 f. Tese (Doutorado em Irrigação e Drenagem) - Escola Superior de Agricultura "Luiz de Queiroz". Universidade de São Paulo, Piracicaba
Houghton FC, Yaglou CP (1923) Determining lines of equal comfort. ASHVE Trans 29:163–176
Macari M, Furlan RL (2001) Ambiência na produção de aves em clima tropical. In: da Silva IJ (ed) Ambiência na produção de aves em clima tropical. FUNEP, Piracicaba, pp 31–87
MEDEIROS CM, BAÊTA FC, OLIVEIRA RFM, TINÔCO IFF, ALBINO LFT, CECON PR (2005) Índice térmico de produtividade para frangos de corte. Rev Bras Engenharia Agrícola Ambiental Campina Grande 9(4):660–665
Moura DJ, Naas IA, Silva IJO, Sevegnani KB, Correa ME (1997) The use of enthalphy as a thermal comfort index. In: Livestick environment, v.5, St. Joseph. Proceedings, vol 1. ASAE, St. Joseph, pp 242–248
Nääs IA, Moura DJ, Laganá C (1995) Utilização da entalpia como variável física de avaliação do conforto térmico na avicultura de corte. In: Conferência Apinco 1995 de Ciência e Tecnologia Avícolas. Anais, Curitiba -PR, pp 201–202
Silva IJO, Barbosa Filho JAD, Silva MAN, Piedade SMS (2006) Influence of breeding systems on behavior of two lineages of laying hens exposed to two environmental conditions. v. 35, n. 4. Revista Brasileira de Zootecia, Viçosa
Silva MAN, Hellmeister Filho P, Rosário MF, Coelho AAD, Savino VJM, Garcia AAF, Silva IJO, Menten JFM (2003) Influência do sistema de criação sobre o desempenho, condição fisiológica e o comportamento de linhagens de frango de corte., v. 32, n. 1, vol 32., pp 208–213
Teeter RG (1990) Estresse calórico em frangos de corte. In CONFERÊNCIA APINCO DE CIÊNCIA E TECNOLOGIA AVÍCOLAS. SP, Campinas, pp 33–44
Thom EC (1959) The Discomfort Index. Weatherwise 12:57–60
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Rodrigues, V.C., da Silva, I.J.O., Vieira, F.M.C. et al. A correct enthalpy relationship as thermal comfort index for livestock. Int J Biometeorol 55, 455–459 (2011). https://doi.org/10.1007/s00484-010-0344-y
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00484-010-0344-y