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12.4 A horizontal semitransparent plate is uniformly irradiated from above and below, while air at T = 310 K flows over the top and bottom surfaces, providing a uniform convection

heat transfer coefficient of h50%3DW/m2 . K. The absorptivity of the plate to the irradiation is o.40. Under steady-state conditions measurements made with a radiation detector above the top surface indicate a radiosity (which includes transmission, as well as reflection and emission) of J = 5500 W/m2,while the plate is at a uniform temperature of T = 360 K. Determine the irradiation G and the emissivity of theplate. Is the plate diffuse-gray (e = a) for the prescribedconditions?

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