question archive The outside surface temperature of a pipe (radius=0

The outside surface temperature of a pipe (radius=0

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The outside surface temperature of a pipe (radius=0.1m) is 400K. The pipe is losing heat to atmosphere which is at 300K. The film heat transfer coefficient is 10 W/m2K. To reduce the rate of heat loss, the pipe is insulated by a 50 mm thick layer of asbestos (K=0.5 W/mK). Calculate the percentage reduction in the rate of heat loss.

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