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Which type of absorber increases the heat transfer area over a simple flat plate absorber of the same capacity?

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Which type of absorber increases the heat transfer area over a simple flat plate absorber of the same capacity?

(a) Porous absorber plate

(b) Non-porous absorber plate

(c) Over lapped glass absorber

(d) Finned absorber

This question was posed to me during an online interview.

I'd like to ask this question from Flat Plate Collectors in division Solar Energy of Energy Engineering

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Correct option is (d) Finned absorber

Explanation: The finned plate absorber increases the heat transfer area over a simple flat absorber of same capacity. A good design of a finned absorber can increase the heat transfer rate. The temperature difference between the absorber plate and air is very low.

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