Abstract: A gangable solar energy collector module utilizes an insulative housing containing a plurality of hollow interior conduits confronting the sun, separated from one another by slots, and overlying an energy absorbing tank which is connected with the conduits to permit flow of heat transfer medium therebetween. The conduits and underlying energy absorbing tank are positioned between supply and return ducts which extend beneath the conduits so that solar energy passing through the slots strikes the ducts and is either absorbed or reflected upwardly toward the conduits for absorption by the conduits. Each supply and return duct has a central segment within the insulative housing and has a terminal segment at each end of the central segment, each terminal segment being thermally insulated from the central segment and extending through and outwardly from the housing to permit a plurality of such collectors to be ganged by series connecting all supply ducts and series connecting all return ducts.

Abstract: A solar energy collector connectable with a fluid-circulating system is contained in a plenum within an insulative housing and has a plurality of generally parallel, heat-absorbing conduits extending between intake and outlet manifolds and confronting the sun or other heat source through a transparent window, each conduit being separated from an adjacent conduit by an intervening slot. Positioned below the conduits is a heat-absorbing tank which is connected in fluid-flow relationship with the outlet manifold and also with the circulation system so that a heat-transfer medium may flow continuously between the energy collector and the circulation system. The tank receives radiant energy through the slots and after absorbing some of the radiation reflects the remaining portion upwardly to the conduits to thereby increase radiation intensity on and heat absorption by the conduits. Multiple reflections between tank and conduits further increase energy absorption both by tank and conduit.