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Problem 1 (25 points) In an experiment to measure heat transfer coefficients, a very thin foil of low emissivi attached to a slab of material with low thermal conductivity. The other surface of the metal foil is exposed to convection heat transfer by fluid flowing over the foil surface. The slab on which the metal foil is attached has a thickness of 30 mm and a thermal conductivity of 0.023 W/m K in a condition where the surrounding room temperature is 25°C, the metal foil is heated electrically with uniform heat flux of 4200 W/m2. The heat transfer coefficient due to radiation can be found with the following relation: TXT,+) . If the bottom surface of the slab is 25°C and the foil has an emissivity of 0.025. ty is Conduction resistance (plane wall:Ri hA a) Draw the appropriate thermal resistive network. label the resistances & perform a heat b) Determine the convection heat transfer if air is flowing over the foil and the surface c) Determine the convection heat transfer coeflicient if water is flowing over the foil and balance. temperature of the foil is 160 C surface temperature of the foil is 35°C

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冫27 -亙) ชา Loo 0.023x (60-25 . (25-160-0 22* 16) 28.9 w1m2kcientuo:025 elke Plat 36mm とっ0.023 w/vn R KA Con-V- Sun T Kcordl

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