Problem Set 5.pdf - UNIVERSITY OF ARIZONA DEPARTMENT OF...

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UNIVERSITY OF ARIZONA DEPARTMENT OF CHEMICAL AND ENVIRONMENTAL ENGINEERING CHEE 305 TRANSPORT PHENOMENA SPRING 2017 Problem Set 5 Due: Monday, March 6 1. Our subjective feeling of hot and cold depends exclusively on the rate at which heat is lost through our skin. In this problem, we will model the skin as a flat layer of fatty tissue (k = 0.3 W/m K) with a thickness of 4 mm, separating an environment with a constant temperature of 37 ºC (normal body temperature) and the outside air. (a) On a calm winter day with an ambient temperature of 0 ºC, if the convective heat transfer coefficient between the skin and the ambient air is approximately equal to 20 W/m 2 K, find the heat flux lost through the skin (in W/m 2 ). (b) On a windy day, the convective heat transfer coefficient might reach 50 W/m 2 K. For the same ambient temperature (0 ºC), find the heat flux lost through the skin. (c) What would the ambient temperature need to be to have, on a calm day, the same heat loss as in part b? This temperature is called the
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