Homework Help: Thermodynamics and Heat Transfer

Posted by Raul on Wednesday, April 21, 2010 at 8:29pm.

A steam pipe is 75 mm external diameter and is 80 m long. It conveys steam at a
rate of 1000 kg/h at a pressure of 2 Mpa. The steam enters the pipe with a
dryness fraction of 0.98 and is to leave the pipe with a dryness of not less than 0.96. The pipe must be insulated – the material to be used has a thermal coefficient of conductivity of 0.08 W/mK.
If the temperature drop across the pipe is negligible, find the minimum thickness of insulation required to meet the conditions. The temperature at the outer surface of the insulation is 270C.

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