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The collector (collector) collects the radiated energy of the sun and transfers it to a heat transfer medium. The core of the collector is the absorber with the largest possible surface in the color black, because black causes the least reflection. The degree of absorption indicates how much of the incident radiation is absorbed and the emissivity of how much is returned. The aim is to keep the radiation as low as possible. Selective coatings, which already reach over 90% absorbance, allow the absorption of solar radiation and its conversion into heat. There are currently three types of collectors in use. For the pool / swimming pool heating the plastic collector and for the application in the domestic engineering the flat collector and the
Flat plate andThe flat plate collector represents the cheaper standard version and can cover more than half of the required domestic hot water requirement if properly dimensioned
Tube collector is more complex to manufacture and has a much better efficiency. The worst effect of the plastic collector, but is completely sufficient for this application and represents the cheapest option.
Cost of solar panelsOf course, the specific collector costs also play a role. They are at vacuum
Tube collectors with a collector area of 1,000 to 2,500 DM / m a lot more than flat-plate collectors (300 to 1,200 DM / m ) or even plastic absorbers (50 to 200 DM / m ). But a good collector is still
long no guarantee for a good solar system. Rather, all system components should be of high quality and optimally coordinated
Further collector types for special applications are the air collector, which, as the name implies, serves to heat air and the storage collector, which requires a completely different structural design of the solar system.
by Peter Morgenroth