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A solar collector absorbs
solar radiation and converts it into heat (photo-thermal conversion).
The high efficiency solar collector implies maximum absorption of
incident solar radiation with a minimum thermal and optical loss.
Selective coating characteristics of the absorber and the vacuum
insulation are the most important parts of an advanced collector. A
selective surface has high absorption (low reflection) for the solar
spectrum and low emissivity for the infrared heat radiation. The
selective coating used in the collector consists of a very precise thin
layer of an amorphous semiconductor plated on to a metal substratum
having a low emission for long-wave radiation. |
