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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, evaporation of sweat (2,430 kJ/kg), evaporation from the lungs (38 k/h), conduction, an convection. A person working out in a gym has a metabolic rate of 2,500 kJ/h. His body temperature is 37°C, and the outside temperature 27°C. Assume the skin has an area of 2.0 m2 and emissivity of 0.97. (a - 5.6696 x 108 W/m2. K) (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at least one decimal place.) 120.9892 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. W (b) If he eliminates 0.38 kg of perspiration during that hour, at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decimal place.) 256.5 (c) At what rate is energy eliminated by evaporation from the lungs? (Enter your answer to at least one decimal place.) 10.56 (d) At what rate must the remaining excess energy be eliminated through conduction and convection?

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 k/h), conduction, an convection. A person working out in a gym has a metabolic rate of 2,500 kJ/h. His body temperature is 37°C, and the outside temperature 27°C. Assume the skin has an area of 2.0 m2 and emissivity of 0.97. (a - 5.6696 x 108 W/m2. K) (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at least one decimal place.) 120.9892 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. W (b) If he eliminates 0.38 kg of perspiration during that hour, at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decimal place.) 256.5 (c) At what rate is energy eliminated by evaporation from the lungs? (Enter your answer to at least one decimal place.) 10.56 (d) At what rate must the remaining excess energy be eliminated through conduction and convection?

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
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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, evaporation of sweat (2,430 kJ/kg), evaporation from the lungs (38 kJ/h), conduction, ane convection. A person working out in a gym has a metabolic rate of 2,500 k)/h. His body temperature is 37°C, and the outside temperature 27°C. Assume the skin has an area of 2.0 m? and emissivity of 0.97. (a = 5.6696 x 108 w/m2 . K*) !! (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at least one decimal place.) 120.9892 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. W (b) If he eliminates 0,38 kg of perspiration during that hour, at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decimal place.) 256.5 (C) At what rate is energy eliminated by evaporation from the lungs? (Enter your answer to at least one decimal place.) 10.56 (d) At what rate must the remaining excess energy be eliminated through conduction and convection? Need Help? Read it
Transcribed Image Text: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, ane convection. A person working out in a gym has a metabolic rate of 2,500 k)/h. His body temperature is 37°C, and the outside temperature 27°C. Assume the skin has an area of 2.0 m? and emissivity of 0.97. (a = 5.6696 x 108 w/m2 . K*) !! (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at least one decimal place.) 120.9892 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. W (b) If he eliminates 0,38 kg of perspiration during that hour, at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decimal place.) 256.5 (C) At what rate is energy eliminated by evaporation from the lungs? (Enter your answer to at least one decimal place.) 10.56 (d) At what rate must the remaining excess energy be eliminated through conduction and convection? Need Help? Read it
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