Problem (5): Two concentrating collectors (collector A and collector B) have the same concentration factor of CR = 7 and the optical efficiency of nar = 0.88. The collector temperature for both collectors is 145°C and the ambient air temperature is 27°C. The heat transfer coefficient for collector A is 2.5 W/m2.°C and that for collector B is 3.5 W/m2.°C. The solar irradiation on collector A is 600 W/m?. (a) At what solar irradiation rate does collector B have the same efficiency as collector A? (b) What is the efficiency change of collector A when the solar irradiation increases to 900 W/m2?

Problem (5): Two concentrating collectors (collector A and collector B) have the same concentration factor of CR = 7 and the optical efficiency of nar = 0.88. The collector temperature for both collectors is 145°C and the ambient air temperature is 27°C. The heat transfer coefficient for collector A is 2.5 W/m2.°C and that for collector B is 3.5 W/m2.°C. The solar irradiation on collector A is 600 W/m?. (a) At what solar irradiation rate does collector B have the same efficiency as collector A? (b) What is the efficiency change of collector A when the solar irradiation increases to 900 W/m2?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Problem (5):
Two concentrating collectors (collector A and collector B) have the same concentration
factor of CR = 7 and the optical efficiency of nar = 0.88. The collector temperature for both
collectors is 145°C and the ambient air temperature is 27°C. The heat transfer coefficient
for collector A is 2.5 W/m2.C and that for collector B is 3.5 W/m2.°C. The solar irradiation
on collector A is 600 W/m2. (a) At what solar irradiation rate does collector B have the
same efficiency as collector A? (b) What is the efficiency change of collector A when the
solar irradiation increases to 900 W/m2?

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