초록 ▼

An elongated solar heat collector is formed by means of a heat exchanger having two thin-walled tubes arranged coaxially of one another, a cylindrical, transparent heat shield positioned coaxially around the tubes and an elongated parabolic reflector mounted to locate the focal axis of the reflector

An elongated solar heat collector is formed by means of a heat exchanger having two thin-walled tubes arranged coaxially of one another, a cylindrical, transparent heat shield positioned coaxially around the tubes and an elongated parabolic reflector mounted to locate the focal axis of the reflector on the axis of the tubes and shield. The outer tube of the heat exchanger has helical corrugations extending along a greater portion of its length and the valleys of the corrugations are made to contact the outer surface of the inner tube so that a helical passageway is defined between the inner and outer tubes. The straight elongated passageway of the inner tube and the helical passageway between the coaxial tubes communicate with one another at one end of the elongated collector so that two fluid flow paths defined by the passageways are serially connected and permit a fluid heat exchange medium such as water to flow in and out of the exchanger. With such construction, solar energy directed from the reflector through the transparent shield heats the water or other medium by conduction when the medium flows in one direction through the inner tube as well as when the water flows in the opposite direction in the helical passageway within the outer tube.

대표청구항 ▼

A solar heat collector for heating water or other fluid heat exchange mediums, said collector comprising: an elongated heat exchanger providing two fluid flow paths each extending substantially the full length of said exchanger, said exchanger including means serially connecting said two flow paths

A solar heat collector for heating water or other fluid heat exchange mediums, said collector comprising: an elongated heat exchanger providing two fluid flow paths each extending substantially the full length of said exchanger, said exchanger including means serially connecting said two flow paths at one end of said exchanger so that fluid introduced at one end of said exchanger to one of said flow paths first traverses the length of said exchanger by flowing along one of said flow paths in one direction and then traverses the length of said exchanger by flowing through the other of said flow paths in the opposite direction, said flow paths being defined by two coaxially positioned, thin walled tubes, having internal passageways, one of the tubes being helically corrugated along a substantial portion of its length whereby one of said flow paths includes an elongated passageway coaxially within the two tubes and the other of said flow paths includes at least one helical passageway circulating around said elongated passageway; a heat trapping annular shield of optically transparent material surrounding said heat exchanger and extending along a major portion of its length; an elongated reflector having an elongated and generally parabolic reflecting surface which focuses incident solar energy onto a focal line extending along the length of said reflector; and means mounting said reflector relative to said heat exchanger with said heat exchanger generally colinear with said focal line.