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A 20-cm-diameter hot sphere at 120C is buried in the ground with a thermal conductivity of 1.2 W/m K.

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A 20-cm-diameter hot sphere at 120°C is buried in the ground with a thermal conductivity of 1.2 W/m · K. The distance between the center of the sphere and the ground surface is 0.8 m and the ground surface temperature is 15°C. The rate of heat loss from the sphere is
(a) 169 W

(b) 20 W

(c) 217 W

(d) 312 W

(e) 1.8 W

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Related Book For  answer-question
Heat And Mass Transfer Fundamentals And Applications

Heat And Mass Transfer Fundamentals And Applications

ISBN: 9780073398181

5th Edition

Authors: Yunus Cengel, Afshin Ghajar

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Question Details
Chapter # 3- Steady Heat Conduction
Section: Problems
Problem: 214
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Question Posted: September 15, 2023 09:20:38
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