Warm Air Collector (a kind of a flat collector)
The absorber is the mean part of the collector. In the case of the solar
chimney power plant large glass roofs are needed. These power plants have an
output of 50 to 400 MW each. A 200 MW plant will produce about 1.500 GWh/year at
2.300 kWh/square(m) radiation. For such measurements is it now important to
have proceedings against casualties because of convection (due to wind outside the
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absorber) and transmission (due to the contact with colder materials like steel wich
supports the glass roof). But just in the closer area of the roof to the chimney is to
adjust thermal covering and translucer for the air temperature which is high at the
biggest diameter and decreases with decreasing diameter. The costs for a panelling
at the sides and the support places with material that thermal covers or a vaccum
insulation of the complete absorber (glass or foil) would not been useful with a view
to the efficiency.