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hw2 - ME 324 HW#2 07.03.2011 1 Steam at 320C flows in a...

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ME 324 HW #2 07.03.2011 1. Steam at 320ºC flows in a case iron pipe ( k = 80 W/m ºC) whose inner and outer diameters are 5 cm and 5.5 cm, respectively. The pipe is covered with 3-cm-thick glass wool insulation with k = 0.05 W/m ºC. Heat is lost to the surroundings at 5ºC by natural convection and radiation, with a combined heat transfer coefficient of h = 18 W/m 2 K. Taking the heat transfer coefficient inside the pipe to be h = 60 W/m 2 K, determine (1) the rate of heat loss from the steam per unit length of the pipe, and (2) the temperature drop across the insulation. insulation T ∞,o r 2 T ∞,i r 1 r 3 2. A wire of 1.0 mm in diameter is maintained at a temperature of 200ºC and exposed to a convection environment at 30ºC with the convective heat transfer coefficient of 60 W/m 2 ºC. (1) What will be the heat loss per unit length (1 m) if there is no insulation on the wire? (2) Now it is planned to use the glass fiber as an insulator for the wire. The glass fiber has the
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