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L1 Consider an opaque horizontal plate that is well insulated on its back side. The irradiatian on the plate is2500 W/m', of which 500 W/m is reflected. The plate is

at 227°C and has an emissive power of 1200 W/m.Air at 127°C flows aver the plate with a convection heat transfer coefficient of 15 W/m? • K. Determine the emissivity, absorptivity, and radiosity of the plate. What is the net heat transfer rate per unit area?

Fig: 1