Importance

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Abstract

A solar heat collection device comprising collectors arranged to be fixedly disposed as sub-collectors each of a set of at least two of such collectors, with one longitudinal edge of their screen adjoining one another. The sub-collectors are of identical construction and each designed to collect solar heat during an associated sub-period of at least two consecutive sub-periods of the solar day. Each sub-collector contains a primary liquid heating tube and a separate, secondary liquid heating tube parallel to said primary liquid heating tube and connected in series with said primary liquid heating tube in the bottom part of the sub-collector. In cross-section, the two tubes adjoin one another in the direction of depth of the sub-collector and extend, in that direction, from the deepest part of said trough for a joint height which is no greater than approximately one-fourth of the aperture width of the sub-collector, measured between the longitudinal edges thereof. Each sub-collector has a reflection screen which, in cross-section, has such a curved form that said screen, disposed in a position in which its longitudinal median plane is directed to the sun halfway the sub-period concerned, during a central period falling within said sub-period and corresponding with an angular range of the position of the sun from -X.degree. to +X.degree. relative to said longitudinal median plane, reflects the sun rays incident upon said screen substantially on to said primary tube, and during shorter time intervals immediately before and immediately after said central period, reflects the sun rays incident upon the screen mainly to the anterior secondary tube, the longitudinal median planes of the two sub-collectors forming the set being angularly off-set relatively to each other through an angle of at least approximately 2X.degree..

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First Claim