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Finding heat transfer rate

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A thin electrical heater is wrapped around the outer surface of a long cylindrical tube whose inner surface is maintained at a temperature of 5˚C. The tube wall has inner and outer radii of 25 and 75 mm, respectively, and a thermal conductivity of 10 W/m.K. The thermal contact resistance between the heater and the outer surface of the tube (per unit length of the tube) is 0.01 m.K/W. The outer surface of the heater is exposed to a fluid with T= 10˚C and a convection coefficient of h = 100 W/m2.K. The heater power per unit length of tube (W/m) required to maintain the heater at To = 25˚C is:

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