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A flat, isothermal heating panel, 0.5 m wide by 0.8 m high, is mounted to one wall of a large room. The surface of the panel has an emissivity of 0.85 and is maintained at 510 K. If the wall and air of the room are at 295, what is the net rate at which heat is transferred from the panel to the room? Air: k = .03 W/m*K, kinemetic viscosity = 20.9e-6 m2/s, Pr = 0.70, thermal diffusivity = 29.9e-6 m2/s. Use the correlation Nu = {0.825+0.387Ra^(1/6)/[1+(0.492/Pr)^(9/16)]^(8/27)}^2.
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