[복사열전달] Emittance

A water pipe made of copper (inner diameter 20 mm, wall thickness 3 mm) is used to deliver warm water (50 C) outdoor between buildings. Due to oxidation of the copper surface, the emittance of the outer surface of the pipe is 0.9. Assume the thermal conductivity of the copper wall is 400 Wm−1K−1, neglect the difference between the areas of the inner and outer surfaces of the pipe, the heat transfer coefficient between the outer surface of the pipe and air is 5 Wm−2K−1 , the heat transfer coeffic...

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