A horizontal, opaque surface at a steady-state

Chapter 12, Problem 12.2

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A horizontal, opaque surface at a steady-state tempera-ture of 77C is exposed to an airflow having a freestream temperature of 27C with a convection heattransfer coefficient of 28 W/m2?K. The emissive powerof the surface is 628 W/m2, the irradiation is1380 W/m2, and the reflectivity is 0.40. Determine theabsorptivity of the surface. Determine the net radiationheat transfer rate for this surface. Is this heat transfer tothe surface or from the surface? Determine the com-bined heat transfer rate for the surface. Is this heattransfer to the surface or from the surface?

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