Modeling the exergy behavior of human body
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Citações na Scopus
61
Tipo de produção
article
Data de publicação
2012
Título da Revista
ISSN da Revista
Título do Volume
Editora
PERGAMON-ELSEVIER SCIENCE LTD
Autores
MADY, Carlos Eduardo Keutenedjian
FERREIRA, Mauricio Silva
YANAGIHARA, Jurandir Itizo
OLIVEIRA JUNIOR, Silvio de
Citação
ENERGY, v.45, n.1, p.546-553, 2012
Resumo
Exergy analysis is applied to assess the energy conversion processes that take place in the human body, aiming at developing indicators of health and performance based on the concepts of exergy destroyed rate and exergy efficiency. The thermal behavior of the human body is simulated by a model composed of 15 cylinders with elliptical cross section representing: head, neck, trunk, arms, forearms, hands, thighs, legs, and feet. For each, a combination of tissues is considered. The energy equation is solved for each cylinder, being possible to obtain transitory response from the body due to a variation in environmental conditions. With this model, it is possible to obtain heat and mass flow rates to the environment due to radiation, convection, evaporation and respiration. The exergy balances provide the exergy variation due to heat and mass exchange over the body, and the exergy variation over time for each compartments tissue and blood, the sum of which leads to the total variation of the body. Results indicate that exergy destroyed and exergy efficiency decrease over lifespan and the human body is more efficient and destroys less exergy in lower relative humidities and higher temperatures.
Palavras-chave
Human body behavior, Exergy analysis, Exergy efficiency
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