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Question: 43 water at 90c flows inside a 10 cm inner...

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4-3: Water at 90°C flows inside a 10 cm inner diameter stainless steel pipe that is 3 mm thick. Convection between the pipe wall and the water is characterized by a heat transfer coefficient of h 1000 W/m2K. The pipe is fully wrapped by a thin electric heater that is in perfect thermal contact with the pipe. The heater is 300°C and is wrapped in fiberglass insulation that is 5 mm thick and has a contact resistance of 0.3 m2 K/W with the heater. The entire composite sits in a room with air at 20°C and has a ho-5 W/m2K. Find the heat rate per unit length delivered by the heater.
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