| 摘要 |
<p>1532685 Solar heaters PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 14 May 1976 [17 May 1975] 19985/76 Heading F4U A solar collector comprises an absorber 3 for transferring heat from incident solar radiation to a transport medium, e.g. water in ducts 5, and a heat-insulating cover which separates the absorber from the ambient atmosphere. The cover consists of contacting sealed and evacuated glass tubes 1. As shown, the inner sides of the tubes are each provided with an infrared reflecting layer 2 of In 2 O 3 , silver, gold or tin oxide on the lower half of the tubes or on the entire inner surface, Figs. 2-4 (not shown). The absorber 3 consists of a copper plate 4 which contacts the ducts 5 and which has an absorption surface 6, which may be blackened. A reflection-reducing layer of cryolite, magnesium fluoride or an oxide of silicon may be deposited on top of the infrared reflecting layer 2. Foils may extend from the junctions of each pair of tubes to the absorber to reduce convection, Fig. 3 (not shown). The tubes may be covered by a glass plate, Fig. 4 (not shown). The outer surfaces of the tubes may be covered with a layer of transparent enamel.</p> |
