Abstract

Attempt has been taken to compare the performance between the Cylindrical parabolic concentrator and Fresnel mirror concentrator for both semi cloudy day and bright sunny day by using flat horizontal absorbers mounted with a string of 15 modified grid finger mono crystalline silicon solar cells of size 4.9cm × 4.9cm. The performance of both concentrators is measured in terms of electrical efficiencies and fluctuation of local concentration distributions on a flat horizontal absorber. It has been found that for a bright sunny day the average electrical power output and efficiency of Cylindrical parabolic concentrator and Fresnel mirror concentrators are 21.3 W and 3.4%; 35.3 W and 4.5% respectively. For a semi cloudy day the average electrical power output and efficiency of both concentrators are 13.48 W and 2.7%; 23 W and 3.7% respectively. It has been also observed from the experiment that the local concentration distributions of Freasnel mirror concentrator fluctuated more than that of cylindrical parabolic concentrator. Overall, it has been observed that Fresnel mirror concentrator is more efficient than cylindrical parabolic concentrator.

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