A flat plate solar collector with no cover plate has a selective absorber surface of emissivity...

A flat plate solar collector with no cover plate has a selective absorber surface of emissivity 0.1 and solar absorptivity 0.95. At a given time of day the absorber surface temperature ?? is 120℃ when the solar radiation is 750 W/m^2, the effective sky temperature is -10℃, and the ambient temperature ?∞ is 30℃. Assuming that the heat transfer convection coefficient for the calm day conditions, estimated h= 0.22 (?? −?∞) 1 3 W/m^2 K.

(a) Calculate the useful heat removal rate (W/m^2 K) from the collector for these conditions.

(b) What is the corresponding efficiency of the collector?

Expert Solution

ANS:

(a)

(b)

The detailed solution is given below:

samet mamat answered 1 year ago

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