placed above the collector which upper glass is 0.004 m from‘‘water white’’ glass (Ke = 4)and bottom glass is 0.006 m from ordinary glass (Ke = 32) that there is the airy distance of 0.045 m between them. The effective area of the collector was 0.67 m2 . Also,
in the rule of sands keeper,the justified plates from 1.5 mm tick
galvanized steel, with distances of 0.01 m from each other,were
installed with location of0.05 munder the down glass orcover