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(c) Absorber plate: This is a blackened conducting flat plate, corrugated or grooved, with tubes and fins for the absorption of short-wavelength solar radiation (Fig. 5.1b).
It can transmit up to 90 % of incident short-wavelength radiation, but it behaves as opaque for long-wavelength heat radiation (≥2.6 μm), which is emitted by the absorber plate.
In case of the water collector, water flowing in the tubes receives thermal energy from the absorber plate.
Materials generally used for collector absorber plates are copper, aluminum, and steel.
The selective surface coating of the absorber plate must
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