Abstract: A hybrid collector for collecting solar energy comprised of a plurality of parabolic reflectors cooperating with tube/fin type fluid carrying collector elements, selective ones of which are arranged at the focal points of the parabolas. Additional tube/fin elements are positioned at a spaced distance above the boundary line between adjacent parabolic reflectors. The exterior surfaces of the tube/fin collector elements are treated preferably with a selective coating to provide high absorptivity and low emissivity. The surface areas of the tube/fin elements are also reduced to further contribute to a reduction in emissivity to optimize total absorptance. Location of the tube/fin elements which are off the parabolic reflector focal points cooperate with those located at the focal points to absorb diffuse energy while the tube/fin elements at the focal points absorb beam energy providing for both absorption of beam energy on clear sunny days and absorption of diffuse energy on cloudy or overcast days.

Abstract: A solar collector is disclosed that enables the installation of the collector parallel to the surface plane or angle of any structure, including vertical walls and flat roofs, without affecting generating efficiency. The collector is efficient for both energy absorption and transfer to the transport fluid. The collector removes architectural constraints and is suitable for building structure applications not heretofore possible. The collector comprises an array of integral fin/tube extrusions all of which are aligned in the East-West direction. Mechanical linkage rotates the extrusions in unison, with a sun tracking device, to the solar altitude angle. The extrusions, mechanical linkage, and sun tracking device are contained within an insulated housing enclosure. The integral fluid channels likewise extend in an East-West direction, are spaced apart in the North-South direction and are directed to supply and return manifold piping extending in the North-South direction with inlet and outlet connections.

Abstract: A storage tank divided into three liquid-tight compartments. The end compartments are liquid storage compartments and are separated by a central non-liquid holding or "dry" compartment fitted with controls, pumps and instrumentation. The end compartments are selectively coupled by liquid carrying conduits arranged external to the outer shell of the tank. Although the assembly is adapted to be buried underground, easy access to the contents of the intermediate compartment is provided by means of a periscope-like manhole opening. The first and second end compartments respectively store solar heated fluid at a higher temperature and fluid at a lower "use" temperature. The solar heated fluid in the first compartment is transferred to the second compartment for use in a heating system. Auxiliary heating means may be used to elevate the temperature level in the second compartment for example, during "off-peak" demand periods.