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A man working out in a gym has a metabolic rate of 2500 kJ/h. His body temperature is 37°C, and the outside temperature 26°C. Suppose the skin has an area of 2.0 m2 and emissivity of 0.97. (σ =5.6696 * 10-8W/m2•K4)
(a) Determine at what rate is his excess thermal energy dissipated by radiation?
W
(b) If he eliminates 0.34 kg of perspiration during that hour, find at what rate is thermal energy dissipated by evaporation of sweat?
(c) Find at what rate is energy eliminated by evaporation from the lungs?
(d) Find at what rate must the remaining excess energy be eliminated through conduction and convection?
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