| abstract |
Heating appliance for houses, industrial installations and the like, for supplying hot water on the principle of a solar collector, of which the structural elements working as heat exchangers are designed as radiation absorbers and are integrated in a constructional unit, additionally possesses, with the purpose of increasing the efficiency of the collector, reducing the heat losses of the absorber and increasing the transparency, between the collector panel and the actual body of the absorber, a foil or a film which is permeable to sunlight and which forms an upper wall of the space receiving the absorber and also appreciably reflects the ultrared radiation of the absorber. |