Solar energy plant
AssigneeYeda Research and Development Co. Ltd.
InventorsAmnon Yogev, Vladimir Krupkin, Michael Epstein
Life of this patent
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Abstract
The disclosure concerns various improvements in a solar energy plant of the kind in which incoming solar radiation is concentrated by a Fresnel reflector, i.e. a field of concentrating mirrors, and the concentrated radiation is focused into a solar receiver. By one improvement a dielectric mirror is provided at a suitable level above the solar collector, to reflect the concentrated solar radiation into the collector. By another disclosed improvement a plurality of non-imaging secondary concentrators arranged in concentric zones is provided intermediary between the dielectric mirror and receiver. By yet another improvement the solar receiver is directly attached to a heat storage system.
Claims52
A solar energy plant for the conversion of solar radiation into utilizable energy, comprising:
- a Fresnel reflector including a plurality of radiation concentrating mirrors installed on a base plane, said Fresnel reflector being in the form of a heliostats field in which said concentrating mirrors track the sun and having a focal point removed from the heliostats field by a focal length;
- at least one solar receiver placed close to said base plane;
- and
- an additional reflector mounted above said heliostats field close to said focal point so that concentrated solar radiation reflected by the heliostats field is redirected onto said at least one solar receiver;
- and
- wherein said additional reflector is in the form of a dielectric mirror, whereby an overheating of the additional reflector is avoided.
A solar energy plant for conversion of solar radiation of the kind that comprises a working fluid for the withdrawal of absorbed heat, comprising a Fresnel reflector consisting of a plurality of concentrating mirrors installed on a base plane and having a focal point above said base plane removed from the Fresnel reflector by a focal length, at least one solar receiver assembly placed close to said base plane and holding said working fluid and an additional reflector mounted above said Fresnel reflector close to said focal point whereby concentrated solar radiation reflected by the Fresnel reflector is redirected onto said at least one solar receiver assembly, characterized in that the plant comprises intermediary between said additional reflector and said at least one solar receiver, a plurality of non-imaging secondary concentrators arranged in concentric zones, each secondary concentrator associated with a dedicated aperture in said receiver assembly, whereby concentric zones of different temperature are formed inside the receiver and the working fluid is gradually heated when passing from the outermost zone with the lowest temperature to the innermost zone with the highest temperature.
A solar energy plant of the kind comprising a Fresnel reflector consisting of a plurality of concentrating mirrors installed on a base plane and having a focal point above said base plane removed from the Fresnel reflector by a focal length, at least one solar receiver placed close to said base plane and an additional reflector mounted on a tower close to said focal point whereby concentrated solar radiation reflected by the Fresnel reflector is redirected onto said at least one solar receiver, characterized in that the plant comprises means for monitoring a displacement of said additional reflector, which monitoring means may be in the form of laser scanning device or TV imaging system, and means for dynamic adjustment of the heliostats so as to track the displacement of the reflector whereby any impairment of the performance of the plant in consequence of reflector displacement is avoided.
A solar energy plant for conversion of solar radiation into heat, comprising:
- a Fresnel reflector including a plurality of radiation concentrating mirrors installed on a base plane and having a focal point above said base plane removed from the Fresnel reflector by a focal length;
- at least one solar receiver placed close to said base plane;
- and
- an additional reflector mounted above said Fresnel reflector close to said focal point so that concentrated solar radiation reflected by the Fresnel reflector is redirected onto said at least one solar receiver;
- wherein said at least one solar receiver is in the form of a heat storage system and said additional reflector comprises a dielectric mirror, whereby an overheating of the additional reflector is avoided.
Dependencies are inferred from the claim text.