Abstract
The main objective of this study is to show a method for calculating entropy generation (Sgen) in a human body under various environmental and physiological conditions. The Sgen in a human body is a measure of activeness of motions, reactions, and irreversibility of processes occurring in a body and is a kind of holistic and thermodynamic index, which characterizes a human body as a whole. Human body at healthier and normal condition generates the least amount of Sgen. Heat transfer over a human body, activity (at rest, Sgen = 0.21 JIsK or exercise, Sgen. = 2.19 J/sK or at death, Sgen = 0 J/sK), ambient, body and mean radiant temperatures, enussivily and absorbily of human skin, internal heat elimination, body weight and height, and air speed effect much more on the Sgen, in a human body compared to the effects of mass exchange into andoutofthe body, internal heatproduction, cross-sectional area of human body, clothing, altitude, and relative humidity of the surrounding air. Among thesefactors entropy production due to heat tranfer over a human bodyplays a significant role in the total entropy generation rate.
Original language | English |
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Pages (from-to) | 75-92 |
Number of pages | 18 |
Journal | Thermal Science |
Volume | 11 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2007 |
Externally published | Yes |
Keywords
- Age
- Entropy generation
- Heat transfer
- Human body surface area
- Metabolism