12.62 Two plates, one with a black painted surface and the other with a special coating (chemical...
Measurement of the spectral, directional absorptivity of a certain non-reflecting surface shows that directional and spectral dependencies may be model as the product of two independent functions: This surface is irradiated by diffuse blackbody radiation at a temperature of 5800 K. Note that the intensity of ideal radiation can be calculated at Ib= Eb/pi(W/m2 -sr). The surface is at a uniform temperature of 300 K. Determine the rate that energy is absorbed by the surface (W/m2 ) Determine the net...
please show me how I can finds the answers of these two examples Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...