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April 24, 2014

Homework Help: PHYSCS

Posted by melisa on Friday, January 6, 2012 at 5:01pm.

Suppose a person metabolizes 2150 kcal/day.

a) With a core body temperature of 37.1C and an ambient temperature of 21.3C, what is the maximum (Carnot) efficiency with which the person can perform work?

b) If the person could work with that efficiency, at what rate, in watts, would they have to shed waste heat to the surroundings?

c) With a skin area of 1.51 m2, a skin temperature of 26.7C, and an effective emissivity of e = 0.610, at what net rate does this person radiate heat to the 21.3C surroundings?

d) The rest of the waste heat must be removed by evaporating water, either as perspiration or from the lungs. At body temperature, the latent heat of vaporization of water is 575 cal/g. At what rate, in grams per hour, does this person lose water?

e) Estimate the rate at which the person gains entropy. Assume that all the required evaporation of water takes place in the lungs, at the core body temperature of 37.1C.

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