A plastic (k = 0.5 W/m*K) pipe carries a coolant at –35C with a heat-transfer coefficient of 300 W/m^2*K. The pipe ID is 3 cm and the OD is 4 cm. The exterior pipe surface is exposed to air at 25C with a heat-transfer coefficient of 20 W/m^2K. Radiative heat transfer may be neglected in this problem. Ans. (a) 114 W/m of pipe. (b) –20.5C. (a)  Calculate the rate of heat transfer to the coolant per meter of pipe length.(b)  Calculate the temperature of the exterior pipe surface. (c)  It is desired to reduce the rate of heat transfer by 90%. Will a 2 cm layer of magnesia insulation be sufficient for this purpose?

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