kareemmostafa045 kareemmostafa045

27-04-2024
Engineering

Answered

Consider a man standing in a room at 22 C. Determine the total rate of heat transfer from this man, if he is wearing a 2-mm-thick long-sleeve cotton T shirt (k = 0.06 W/m.K) and a 5-mm-thick trouser made of wool (k = 0.035 W/m.K). The convective heat transfer coefficient is 5 W/m2.K. Assume the man as a 70-cm in diameter cylinder with total height of 1.7m, and the T-shirt covers half of this height. Neglect heat transfer by radiation. Also, determine the thickness of a jacket made of wool required to make the heat loss rate from the upper and lower parts of the man are the same.

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