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Which part of flat plate collectors is coated in black?

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Which part of flat plate collectors is coated in black?

(a) Transparent cover

(b) Absorber plate

(c) Insulation

(d) Fins

I have been asked this question in exam.

The above asked question is from Flat Plate Collectors in chapter Solar Energy of Energy Engineering

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Best answer
Right choice is (b) Absorber plate

The explanation is: Absorber plate is usually metallic or coated in black surface which is used for absorbing radiation energy. The absorber plate’s coating directly affects how efficient the collector is. Coatings always have two rating figures: how much they absorb and how much they emit.

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