Determine the interface temperature, Mechanical Engineering

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A steel pipe with 50 mm OD is covered with a 6.4 mm asbestos insulation followed by a 25 mm layer of fiber-glass insulation [K = 0.0485 Wmk]. The pipe temperature is 393 K and the outside insulation temperature is 311K. Determine the interface temperature between the fiber-glass and asbestos.

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