A refrigerant at -40degc flows inside a copper pipe inside

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Reference no: EM13626300

A refrigerant at -40°C flows inside a copper pipe (inside diameter = 3 cm, outside diameter = 3.4 cm) with a convective heat transfer coefficient of 110 W/m2K at the inner surface. To reduce the heat flow into the pipe to 20 W per meter length of the pipe, an insulation (k = 0.04 W/mK) is added to the outside of the pipe. For an ambient air temperature of 25°C and a heat transfer coefficient of 18 WIm2K, at the insulation surface, determine the required thickness of the insulation. Show the thermal circuit and label the temperatures and resistances (mathematical expressions).

Reference no: EM13626300

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