An above-ground steam-pipe is made from thin-walled copper that is 5.08 cm in diameter. To reduce...

 

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An above-ground steam-pipe is made from thin-walled copper that is 5.08 cm in diameter. To reduce the heat loss from the 1.25 m long pipe to the -15 °C ambient, it is proposed to wrap the pipe with glass wool insulation that is 3.81 cm thick. a) What is the heat loss from the steam pipe to the ambient in [W] when the steam is at its saturation pressure of 2.639 MPa and the heat transfer coefficient on the outer surface of the insulation is 9 W/m². K? b) For the conditions quoted in part a), estimate (UA) in [W/K] between the steam and the ambient temperatures. If you need a value from part a) for which you did not obtain an answer, clearly make that statement, and clearly state an assumed value that you need to complete this part. An above-ground steam-pipe is made from thin-walled copper that is 5.08 cm in diameter. To reduce the heat loss from the 1.25 m long pipe to the -15 °C ambient, it is proposed to wrap the pipe with glass wool insulation that is 3.81 cm thick. a) What is the heat loss from the steam pipe to the ambient in [W] when the steam is at its saturation pressure of 2.639 MPa and the heat transfer coefficient on the outer surface of the insulation is 9 W/m². K? b) For the conditions quoted in part a), estimate (UA) in [W/K] between the steam and the ambient temperatures. If you need a value from part a) for which you did not obtain an answer, clearly make that statement, and clearly state an assumed value that you need to complete this part.

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To calculate the heat loss from the steam pipe to the ambient and the overall heat transfer coeffici... View the full answer