Question 1 Hot oil flows through a steel tube with an outer diameter of 6 cm. The walls of the tube have a temperature of 250°C. The surrounding air has a temperature of 20°C. Assume that heat is transferred from the steel to the surrounding air with an overall heat transfer coefficient of 45 W m² K-1. (i) (ii) How much heat is transferred from the tube into the surroundings, per meter of its length? To improve the heat transfer, circular steel fins with an outer diameter of 9 cm and a thickness of 1 mm are attached, with a spacing of 9 mm, as illustrated below. 9 cm 6 cm T = 250°C T(air)=20°C 1 mm fin thickness 9mm spaa left fins fin spacing Determine the increase in heat transfer from the tube, per meter of its length, because of adding fins. Assume a fin efficiency of 95%.

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