A 2 cm thick steel pipe (thermal conductivity 43 W/[m C]) with 6 cm inner diameter is

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Question:

A 2 cm thick steel pipe (thermal conductivity 43 W/[m °C]) with 6 cm inner diameter is used to transport steam from a boiler to process equipment over a distance of 40 m. The inner surface temperature of the pipe is 115°C and the outer surface temperature of the pipe is 90°C. Calculate the total heat loss to the surroundings under steady-state conditions.