Answer to Question #245732 in Mechanical Engineering for mds

Question #245732

Solar radiation is incident on a semi-transparent body at a rate of 900 W/m2 . If 150 W/m2 of this incident radiation is reflected back and 225 W/m2 is transmitted across the body, determine the absorptivity of the body. 



1
Expert's answer
2021-10-04T02:28:55-0400

Given that;

Total incident radiation = 900 W/m²

Reflected Radiation = 150 W/m²

Transmitted Radiation = 225 W/m²


To Find;

Absorptivity ("\\alpha") = ?


Total radiation = Reflected radiation + Transmitted radiation + Absorbed radiation


Absorbed radiation = "900-150-225" = 525 W/m²


Absorptivity = "\\dfrac{\\text{Absorbed radiation}}{\\textsf{Total radiation}}"


= "\\dfrac{525}{900}" = 0.583


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