Concentrating Collector
Employed for commercial power production,
concentrating collectors consist of parabolic troughs or long mirrors. The
mirrored surfaces have silver or polished aluminum coatings. These high
temperature collectors concentrate the sun's radiation on an absorber tube,
which contains water or a heat-transfer fluid. Installers must position
concentrating china solar
collector on a north--south axis.
Absorber
The solar collector
absorber makes up the most important component of the unit. Absorbers consist of
narrow metal strips made from copper or aluminum. Generally, pipes sandwiched
between two strips carry the heat. Swimming pool absorbers do not require a high
heating capacity; therefore, the absorber may consist of plastic, such as
polypropylene, polyethylene or ethylene propylene diene
monomer.
Efficiency
A solar collector supplier efficiency depends on the amount of
solar radiation received and, ultimately, the amount converted into heat. Most
absorbers use a black solar paint, which increases their ability to absorb a
high amount of light. A more efficient process involves the application of
selective surface coatings. Manufacturers spray or brush a coating of black
nickel, black chrome or aluminum oxide with nickel onto the absorbers. Another
product, titanium-nitride-oxide, has even lower emission ratings, which means it
retains heat at a higher rate. In addition, this coating does not harm the
environment.
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