(a) A flat stainless steel sheet of thickness 5 mm with dimension of 0.5 m X...

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(a) A flat stainless steel sheet of thickness 5 mm with dimension of 0.5 m X 0.2 m (k = 15 W/m.C) serves as the wall of a furnace operating at a temperature of 300 C, while on the other side experiences a bulk atmospheric temperature of 30 C. The combined (convective + radiative) heat transfer coefficient on furnace side is 75 W/m2C, while on atmospheric air side is 10 W/m2C. Estimate the surface temperatuure of stainless steel sheet on the atmospheric air side? (i) (3 marks) It is desired to enhance the rate of heat loss 3 times by attaching fins to the surface of the sheet. It is decided to use fins, which has a total surface area of 0.5 m2, with the unfinned base area being O.025 m?. The fins are short fins with an estimated efficiency of 80%. Will the extended surface serve the purpose? (Use surface temperature estimated in part (i)) (ii) the (4 marks) (a) A flat stainless steel sheet of thickness 5 mm with dimension of 0.5 m X 0.2 m (k = 15 W/m.C) serves as the wall of a furnace operating at a temperature of 300 C, while on the other side experiences a bulk atmospheric temperature of 30 C. The combined (convective + radiative) heat transfer coefficient on furnace side is 75 W/m2C, while on atmospheric air side is 10 W/m2C. Estimate the surface temperatuure of stainless steel sheet on the atmospheric air side? (i) (3 marks) It is desired to enhance the rate of heat loss 3 times by attaching fins to the surface of the sheet. It is decided to use fins, which has a total surface area of 0.5 m2, with the unfinned base area being O.025 m?. The fins are short fins with an estimated efficiency of 80%. Will the extended surface serve the purpose? (Use surface temperature estimated in part (i)) (ii) the (4 marks)