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?...