A concrete wall, which has a surface area of 20 m 2 and is 0.30 m thick,

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A concrete wall, which has a surface area of 20 m² and is 0.30 m thick, separates conditioned room air from ambient air. The temperature of the inner surface of the wall is maintained at 25°C, and the thennal conductivity of the concrete is 1 W/m. K.

(a) Determine the heat loss through the wall for outer surface temperatures ranging from - 15°C to 38°C, which correspond to winter and summer extremes, respectively. Display your results graphically.

(b) On your graph. also plot the heat loss as a function of the outer surface temperature for wall materials having thermal conductivities of 0.75 and 1.25 W/m . K. Explain the family of curves you have obtained.

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Fundamentals of Heat and Mass Transfer

ISBN: 978-0471457282

6th Edition

Authors: Incropera, Dewitt, Bergman, Lavine

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Question Posted: Sep 22, 2010 07:06 AM

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A concrete wall, which has a surface area of 20 m 2 and is 0.30 m thick,

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KNOWN Inner surface temperature and thermal conductivity of a concrete wall FIND Heat loss by conduc...View the full answer

Fundamentals of Heat and Mass Transfer

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