2. Suppose the downward irradiance at the top of a layer of an absorbing gas is 600 Wm2, the upward reflected radiation is 150 Wm-2, and the radiation emerging at the bottom of the layer is 200 Wm-² (a) What is the reflectance of the layer? (b) What is the transmittance of the layer? (c) How much radiation is absorbed in the layer (Wm²)? (d) What is the absorptance of the layer?
2. Suppose the downward irradiance at the top of a layer of an absorbing gas is 600 Wm2, the upward reflected radiation is 150 Wm-2, and the radiation emerging at the bottom of the layer is 200 Wm-² (a) What is the reflectance of the layer? (b) What is the transmittance of the layer? (c) How much radiation is absorbed in the layer (Wm²)? (d) What is the absorptance of the layer?
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Transcribed Image Text:2. Suppose the downward irradiance at the top of a layer of an absorbing gas is 600 Wm2, the upward reflected
radiation is 150 Wm-2, and the radiation emerging at the bottom of the layer is 200 Wm-²
(a) What is the reflectance of the layer?
(b) What is the transmittance of the layer?
(c) How much radiation is absorbed in the layer (Wm-²)?
(d) What is the absorptance of the layer?
Expert Solution
Step 1
Solution:-
(a) Reflectance of surface = fraction of energy which is being reflected.
Irradiance = 600 W m-2 .
Reflected radiation = 150 W m-2
Reflectance = ( 150/600) = 0.25 .
(b) Transmitted energy = 200 W m-2. .
Transmittance = ( 200/600) = 0.33.
(c) from energy balance:-
Irradiance = ( Transmitted energy+ reflected energy+ absorbed energy)
600 Wm-2 =( 200 Wm-2 + 150 Wm-2 + Absorbed energy)
Absorbed energy = ( 600- 350) = 250 Wm-2 .
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