Question: A surface at T = 3 5 0 K has a net heat flux equal to zero i . e . q 0 0 =

A surface at T =350 K has a net heat flux equal to zero i.e. q00=0. The surface is opaque and has an absorptivity of
=0.4. The plate experiences convective cooling due to ambient temperature at T1=300 K with a convection coecient of h =40 W/(m2K). The radiosity is found to be J =5,000 W/m2. What is the emissivity of the plate? Answer: =0.94

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