An opaque surface, 2 m by 2 m, is maintained at 400 K and is exposed to irradiation with G = 1200 W/m2. The irradiation has the spectral distribution of a blackbody at 4000 K. The surface is diffuse and its spectral absorptivity is ai = 0.3 = 0.5 = 0.75 = 0.9 0< < 0.5 um 0.5 um << 1.0 um 1.0 um < 2.0 um > 2.0 um Determine the absorbed radiation, the emissive power, and the net radiation heat transfer.

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.