Q2 Lubricating oil at 150 "C flows through a 25 m long stainless steel pipe surrounded by a 25 "C air. Calculate the heat flow through the pipe. Knowing that the outer and inner diameters of the pipe are 55 mm and 50 mm respectively, the heat conductivity of the steel is 30 W/m.K, and the heat transfer coefficients of water and air are 3500 W/m.K and 200 W/m.K respectively.

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Q: 30°C

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