The composite plate as shown in the figure consists of a foam insulation squeezed between two aluminum alloy panels. The length and the width of the plate are L-10 m and W-3.5 m respectively. If the inner (bottom) surface of the plate is kept at -10°C and outer (top) surface is exposed to air flow at 32°C and 105 km/h, and the solar irradiation. a) For equivalent values of the solar absorptivity and the emissivity of the outer surface (a-e-0.5) estimate the average temperature of the outer surface, (T,.) b) What is the total heat transfer c) What would be the average temperature of the outer surface (T,6) if a=0.15 and e=0,8? qš = 750 W/m² qöonv E 4 = 105 km/h T = 32°C Tso, E=as = 0.5 W = 3,5m %3D ty = 5 mm Urethane foam k = 0.026 W/m-K goond t2 = 50 mm t3 = 5 mm Aluminum alloy kp = 180 W/m-K Ts =-10°C

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.