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Question: problem 1 a mildsteel steam pipe has an outside diameter...

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Problem 1. A mild-steel steam pipe has an outside diameter of 15 cm and a wal thickness of 0.7 cm. It is insulated with a 5.3 em thick layer of magnesia insulation. Superheated steam at 500 K flows through the pipe, and the inside convection heat coefficient is 35 W/m2K. Heat is lost by convection and radiation to surroundings at 300 K, and the sum of outside convection and radiation coefficients is estimated to be 8 W/m2K. (a) Sketch the thermal resistance network of the problem and calculate the individual thermal resistances. (b) Calculate the rate of heat loss for a 20 m length of pipe. Assume that for mild-steel in the considered temperature range k-54 W/m K, while for magnesia k = 0.073 W/m K. Steam Inrulation Air Tj-50 K 6.8 am 12.8 m

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