Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
HUMAN BODY EXERGY ANALYSIS AS A FUNCTION OF BODY FAT AND MUSCLE PERCENTAGE. APPLICATIONS TO THERMAL COMFORT CONDITIONS
Submission Author:
Carlos Eduardo Keutenedjian Mady , SP
Co-Authors:
Matheus Garcia
Presenter: Carlos Eduardo Keutenedjian Mady
doi://10.26678/ABCM.ENCIT2016.CIT2016-0053
Abstract
This project's objective is to find the relation between some thermodynamic properties of the human body and the thermal comfort indices presented in the literature. The human body is modeled as a four layer cylinder, which consists in core, muscle, fat and skin. This model also takes into account the heat exchange between blood and tissue, the blood perfusion rate. Moreover, it includes a control system for sweating, skin blood perfusion and shivering mechanism. Using a computational program (C++) for numerical integration, it is possible to calculate the human body energy and exergy balances for several environments, by variating the local temperature and relative humidity. Eventually it is possible to obtain the human body exergy destruction, the human body exergy efficiency and the exergy flow rates to the environment, in order to compare these physical quantities with the known thermal comfort conditions. This will be performed for different body constitutions, by variating the human body muscle and fat masses, to evaluate the influence of muscle high metabolism and fat insulation characteristic in the properties cited above, and, of course, their relation with the thermal comfort conditions. The partial results obtained indicates that the exergy destruction is bigger in cold areas, where the shivering mechanism is active. Furthermore, this property increases linearly with the muscle mass.
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