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Overall; 80% of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated The mechanisms of elimination are radiation, evap...

Question

Overall; 80% of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated The mechanisms of elimination are radiation, evaporation of sweat (2,430 kJ/kg), evaporation from the lungs (38 kJ/h), conduction _ and convection. A person working out in gym has metabolic rate of 2,500 kJ/h_ His body temperature is 378C and the outside temperature 29*C_ Assume the skin has an area of 2.0 m ? and emissivity of 0.97 5.6696 * 10`= WImz K4) (a) At what rate is his exc

Overall; 80% of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated The mechanisms of elimination are radiation, evaporation of sweat (2,430 kJ/kg), evaporation from the lungs (38 kJ/h), conduction _ and convection. A person working out in gym has metabolic rate of 2,500 kJ/h_ His body temperature is 378C and the outside temperature 29*C_ Assume the skin has an area of 2.0 m ? and emissivity of 0.97 5.6696 * 10`= WImz K4) (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at east one decimal place_ (b) If he eliminates 0.39 kg of perspiration during that hour; at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decima place. ) At what rate energy eliminated by evaporation from the lungs? (Enter your answer to at least one decimal place At what rate must the remaining excess energy be eliminated through conduction and convection?



Answers

Overall, 80$\%$ of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated. The mechanisms of elimination are radiation, evaporation of sweat $(2430 \mathrm{kJ} / \mathrm{kg}),$ evaporation from the lungs $(38 \mathrm{kJ} / \mathrm{h}),$ conduction, and convection.
A person working out in a gym has a metabolic rate of 2500 $\mathrm{kJ} / \mathrm{h}$ . His body temperature is $37^{\circ} \mathrm{C},$ and the outside temperature $24^{\circ} \mathrm{C}$ . Assume the skin has an area of 2.0 $\mathrm{m}^{2}$ and emissivity of 0.97 . (a) At what rate is his excess thermal energy dissipated by radiation? (b) If he eliminates 0.40 $\mathrm{kg}$ of
perspiration during that hour, at what rate is thermal energydissipated by evaporation of sweat? (c) At what rate is energy eliminated by evaporation from the lungs? (d) At what rate must the remaining excess energy be eliminated through conduction and convection?


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