US20090301469A1 - Solar collectors - Google Patents
Solar collectors Download PDFInfo
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- US20090301469A1 US20090301469A1 US12/375,508 US37550807A US2009301469A1 US 20090301469 A1 US20090301469 A1 US 20090301469A1 US 37550807 A US37550807 A US 37550807A US 2009301469 A1 US2009301469 A1 US 2009301469A1
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- prism
- solar
- solar collector
- collector according
- refractor
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/0547—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/10—Prisms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/30—Arrangements for concentrating solar-rays for solar heat collectors with lenses
- F24S23/31—Arrangements for concentrating solar-rays for solar heat collectors with lenses having discontinuous faces, e.g. Fresnel lenses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S30/00—Arrangements for moving or orienting solar heat collector modules
- F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
- F24S30/42—Arrangements for moving or orienting solar heat collector modules for rotary movement with only one rotation axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
- F24S50/20—Arrangements for controlling solar heat collectors for tracking
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/052—Cooling means directly associated or integrated with the PV cell, e.g. integrated Peltier elements for active cooling or heat sinks directly associated with the PV cells
- H01L31/0521—Cooling means directly associated or integrated with the PV cell, e.g. integrated Peltier elements for active cooling or heat sinks directly associated with the PV cells using a gaseous or a liquid coolant, e.g. air flow ventilation, water circulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/0543—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the refractive type, e.g. lenses
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/40—Thermal components
- H02S40/44—Means to utilise heat energy, e.g. hybrid systems producing warm water and electricity at the same time
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/52—PV systems with concentrators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/60—Thermal-PV hybrids
Definitions
- THIS invention relates to solar collectors.
- the function of the solar collector is to concentrate the radiation onto relatively small photovoltaic (PV) cells, while in the case of heat generation, the function of the collector is generally to concentrate the radiation onto a conduit or container conveying or storing a fluid, such as a liquid or gas, the temperature of which is to be elevated.
- PV photovoltaic
- Concentrator systems that employ focusing lenses for primary concentration require either biaxial tracking, i.e. both N-S and E-W, or a secondary tracking system that varies the position of the lens or target in order to ensure that the collected radiation is focused correctly on the target, i.e. PV cells or fluid conduit or container.
- the latter type of system frequently referred to as a 1.5 times tracking system, typically moves the assembly of lenses, associated reflectors and/or target either individually or in arrays. The apparatus required to achieve such movement can however be expensive and complicated.
- One example of a known solar collector uses an assembly of parallel wedges to reduce the angular dispersion of incident solar radiation. Radiation refracted by the wedges is then transported to the target by internal reflection in thin modules composed of wedge-shaped glass elements.
- a disadvantage of the system is however a relatively low concentration ratio of around 2:1.
- “Concentration ratio” refers to the ratio of the area of the solar aperture, i.e. the area on which the solar radiation is incident, to the area of the target onto which the radiation is concentrated. The low concentration ratio is indicative of a low level of efficiency.
- Another example described in U.S. Pat. No. 4,344,417, makes use of a narrow, wedge-shaped collector to receive incident radiation and reflect it internally to the target area. The concentration ratio is however again relatively low, indicating a low level of efficiency.
- JP 11305130 and JP 62266879 Further examples of prior art collectors are described in JP 11305130 and JP 62266879.
- the collector has wedge-shaped prisms and external reflectors arranged at a divergent angle with respect to one another in order to collect radiation over a larger solar aperture and to concentrate such radiation, by both internal reflection in the prisms and external reflection from the reflectors, onto a solar battery.
- N-S aligned, connected wedge-shaped prisms are again used to concentrate incident radiation by internal reflection.
- the prism assembly is used in conjunction with a conventional solar panel.
- a solar collector capable of single axis tracking and comprising:
- At least one radiation-transmitting prism which is wedge shaped in cross section and which has major side surfaces converging at an acute angle to a relatively narrow, operatively upper end of the prism, the prism having an opposite, operatively lower, relatively wide end;
- a refractor arranged over the prism to refract solar radiation incident thereon onto the major side surfaces of the prism, as the sun moves relative to the earth, at angles allowing such radiation to enter the prism and be internally reflected therein towards a target at or adjacent the relatively wide end of the prism.
- the collector is preferably configured for single axis tracking in a plane transverse to the narrow ends of the prisms.
- the collector is movable to track the sun in an E-W plane during the course of a day, typically with means for rotating the collector about a N-S axis.
- the collector is movable to track the sun in a N-S plane during the course of a year, typically with means for rotating the collector about an E-W axis.
- the preferred refractor is a linear refractor, in particular a linear Fresnel lens.
- the narrow ends of the prisms may be adjacent to or in contact with the refractor, or they may be spaced from the refractor.
- the collector may include a reflector arrangement configured to reflect radiation incident thereon at angles appropriate for acceptance thereof by the prism for internal reflection therein, such as an arrangement including convergent reflectors which stand up from the refractor over the narrow ends of the prisms and are arranged to reflect solar radiation outwardly onto the refractor.
- the collector may be located beneath a radiation transmitting cover, for instance in greenhouse or building heating application.
- the collector may include a radiation transmitting secondary solar concentrator at the wider end of each prism. This may have side walls, typically planar or concave, which converge towards one another to a width less than that of the wider end of the prism.
- the secondary solar collector should be made of a material with a higher refractive index than the material of which the prism is made.
- the prism and secondary solar concentrator should meet one another at a curved, typically an upwardly convex, interface.
- FIG. 1 shows a diagrammatic plan view of a solar collector according to one embodiment of the invention
- FIG. 2 shows a diagrammatic cross-section at the line 2 - 2 in FIG. 1 ;
- FIG. 3 shows an enlargement of the circled area in FIG. 2 ;
- FIG. 4 shows a cross-section at the line 4 - 4 in FIG. 1 ;
- FIG. 5 shows a diagrammatic plan view of a solar collector according to a second embodiment of the invention.
- FIG. 6 shows a diagrammatic cross-section at the line 6 - 6 in FIG. 5 ;
- FIG. 7 shows a cross-section at the line 7 - 7 in FIG. 5 ;
- FIG. 8 shows a diagrammatic plan view of a solar collector according to a third embodiment of the invention.
- FIG. 9 shows a diagrammatic cross-section at the line 9 - 9 in FIG. 8 ;
- FIG. 10 shows an enlargement of the cross-sectional view seen in FIG. 9 ;
- FIG. 11 shows a cross-section at the line 11 - 11 in FIG. 8 ;
- FIG. 12 shows a diagrammatic plan view of a solar collector according to a fourth embodiment of the invention.
- FIG. 13 shows a diagrammatic cross-section at the line 13 - 13 in FIG. 12 ;
- FIG. 14 shows a cross-section at the line 14 - 14 in FIG. 12 ;
- FIG. 15 shows an enlargement of the cross-sectional view seen in FIG. 13 ;
- FIG. 16 illustrates a secondary solar concentrator which can be used in the embodiments illustrated in the earlier Figures.
- N, S, E and W refer respectively to north, south, east and west.
- FIGS. 1 to 4 illustrate a first embodiment of solar collector according to this invention. It includes a module 10 having a rectangular bounding frame 12 which supports at an assembly 14 of side-by-side, parallel generally wedge-shaped prisms 16 of, for instance, glass, acrylic or polystyrene as well as a linear refractor 18 , typically in the form of a linear Fresnel lens.
- the linear refractor 18 which may also be of glass, acrylic or polystyrene, is in use exposed to solar radiation and may include an ultraviolet (UV) filter.
- each prism 16 is elongate both in a vertical sense and a horizontal sense.
- each prism has major, planar side surfaces 20 and 21 which converge at an acute angle 22 , in this case 3°, to one another towards a relatively narrow end 24 of the prism.
- the opposite end 26 of the prism is relatively wide and has mounted to it a series of PV cells 28 arranged side by side with one another in a direction into the plane of the paper in FIG. 3 .
- the cells are in turn mounted in contact with aluminium heat sinks 30 which remove excess heat from the cells.
- the numeral 32 indicates an axis about which the module 10 can be rotated.
- the narrow ends 24 of the prisms are attached to the underside of the linear refractor. Although the narrow ends are shown as sharp edges, they may in practice be slightly truncated.
- the prisms are arranged operationally with their narrow edges 24 extending N-S, and the linear refractor is designed to refract solar radiation incident thereon onto the major side surfaces 20 and 21 of the prisms.
- the numerals 34 in FIG. 3 indicate solar rays, assumed to be parallel when incident upon the linear refractor.
- the sun moves relative to the earth, and the module 10 , in a N-S direction.
- With the sun at equinox solar rays 34 . 1 incident upon the linear refractor are refracted towards the lower, i.e. wider end 26 of the illustrated prism 16 .
- the angle at which the rays fall upon the major surface 20 of the prism 16 is within the acceptance angle of the prism, i.e. the rays enter the prism and are not externally reflected at the prism/air interface.
- the surfaces 20 and 21 may be externally coated with a non-reflective coating.
- the module 10 will be able to function very efficiently as a solar collector.
- the sun moves relative to the earth from an easterly to a westerly position.
- the module 10 is rotated at the appropriate angular speed about the axis 32 in order to track the sun during this relative movement.
- the collector illustrated in FIGS. 1 to 4 requires single axis tracking only to take account of different solar angles during the course of the day. It is believed that it will be possible to achieve such single axis tracking in a simple, reliable and economical manner without the necessity for complicated arrangements to vary focal length as in 1.5 times tracking systems.
- the solar rays are refracted parallel to one another on each side of the prism by the linear refractor 18 .
- all solar rays incident on the linear refractor 18 within the illustrated solar aperture, i.e. within the lateral dimension 38 will be concentrated onto the PV cells 28 .
- the side by side spacing of the prisms 16 will accordingly be selected to ensure that all radiation incident on the refractor 18 is captured and concentrated.
- FIGS. 5 to 7 illustrate a second embodiment of the invention.
- components corresponding to those in FIGS. 1 to 4 are designated with the same reference numerals.
- a major difference between the second embodiment and the first embodiment is the fact that the narrow end 24 of each prism is spaced vertically below the linear refractor 18 .
- the refractor 18 is formed with a gap 40 aligned with the central, vertical axis of the prism 16 , and the gap is spanned by a reflector structure 42 composed of upstanding reflector panels 44 arranged at an acute angle to one another.
- solar rays 34 . 7 which would not be refracted by the refractor 18 at an angle acceptable to the prism, i.e. the rays would otherwise be externally reflected by the surfaces 20 and 21 of the prism, are reflected by the reflector panels to angles which result in acceptance by the prism.
- the prisms are, as in FIG. 1 , aligned N-S and the facility is again provided for rotation about the N-S axis 32 in order to track the sun during the course of the day.
- FIGS. 8 to 11 illustrate a third embodiment.
- like components are designated by like numerals.
- the prisms 16 are aligned E-W and the facility is provided for N-S tracking.
- each prism is, as in the second embodiment, spaced some distance below a refractor 18 .
- the target for each prism is a PV solar cell 27 mounted on a fluid pipe 28 through which a fluid such as water is conveyed. The wider end of the prism is connected to the pipe 28 .
- the prism is connected to the refractor 18 by light transmitting side panels 50 , possibly of acrylic, which also provide structural integrity.
- the pipe 28 is rotatable about its own E-W aligned axis in order to track the sun during the course of the year. Rotation of the pipe is accompanied by rotation of the prism 16 and refractor 18 . One or more counterweights (not shown) may also be provided to assist the rotational movement.
- the numerals 34 . 7 indicate solar rays refracted by the refractor 18 at mid-day for different latitude angles of the sun while the numerals 34 . 8 indicate solar rays refracted by the refractor at times early and late in the day, for example 08h00 and 16h00, again for different latitude angles of the sun.
- pipe(s) 28 could be arranged to move in an arc, in a N-S plane as in FIG. 9 , as opposed to rotating.
- FIGS. 1 to 4 and 5 to 7 are described above in electricity generating applications. It will however be understood that such embodiments could also be used for water or other fluid heating duties, in which case the PV cells would be replaced by fluid transfer pipes, fluid containers or the like. It will also be understood that in this application there would be a requirement for fluid pipe connections able to take account of rotational movements about the axis 32 .
- the embodiment of FIGS. 8 to 11 is considered particularly appropriate for fluid heating, particularly in situations where the pipe 28 rotates about its axis and accordingly does not change position.
- PV cells could be embedded during moulding in the wider ends of the prisms 16 .
- FIG. 16 illustrates a modification in which a secondary solar radiation concentrator is indicated by the reference numeral 70 .
- the concentrator 70 which extends for the full length of the prism 16 , is a solid or liquid body made of a material having a higher refractive index than the material of which the prism is made.
- the prism is made of an acrylic, such as PMMA (Polymethyl methacrylate) having a refractive index of less than 1.5 and the secondary concentrator 70 of polystyrol or glass having a refractive index of more than 1.5.
- PMMA Polymethyl methacrylate
- the secondary concentrator is placed at the wider, lower end of the prism 16 and is intimately connected to the prism at an upwardly convex interface defined by a convex surface 72 of the secondary concentrator and a concave surface 74 of the prism.
- the secondary concentrator 70 has planar side surfaces 76 and 78 and a planar lower surface 80 to which, in this example, a heat transmitting coupler 81 is intimately attached.
- the coupler 81 is in intimate contact with the pipe 28 .
- the numeral 82 indicates a solar ray which enters the prism 16 through the side surface 20 , is refracted at the prism/air interface and travels through the lower part of the prism to the convex interface between the prism and the secondary concentrator 70 . At this interface the ray is refracted into the secondary concentrator and is thereafter reflected internally for eventual impingement on the coupler 81 . It will be understood that other solar rays that have been internally reflected in the prism will likewise be refracted into the secondary concentrator 70 for subsequent passage directly or through internal reflection onto the coupler.
- inwardly facing mirrors 84 may be placed against the surfaces 76 and 78 or these surfaces may themselves be mirrored.
- the side surfaces of the secondary concentrator may be concave as indicated diagrammatically by the numeral 86 , or convex.
- the convex interface defined by the surfaces 72 and 74 is preferred to a planar, horizontal interface because it will tend to refract radiation in the appropriate direction for subsequent reflection onto the coupler 81 .
- a secondary concentrator having a convex interface as illustrated may be referred to as a secondary convex concentrator (SCC).
- the refractive index of the SCC be greater than that of the prism 16 in order to ensure that solar rays are appropriately refracted.
- the SCC seen in FIG. 16 will increase the concentration ratio further, implying high levels of solar concentration efficiency. It will furthermore be understood that the SCC could equally well be used to achieve highly efficient concentration of solar radiation onto a PV cell in place of the coupler 81 and pipe 28 in electricity generating applications.
- FIGS. 12 to 15 illustrate another embodiment of the invention in which SCCs 70 are used.
- the numeral 60 indicates an enclosure mounted for example in a fixed position on a building (not shown).
- the enclosure 60 has a light-transmitting roof panel 62 , possibly made of glass or a fluoropolymer.
- Solar collection units 63 each including a linear refractor 18 , prism 16 and SCC 70 , are supported by bearings 64 fixed in spaced metal frames 66 .
- a heat pipe is rotatable in the associated bearing and the linear refractor 18 is supported by support arms or radiation-transmitting sheets 67 .
- Each unit includes a counterweight 68 connected to the associated heat pipe by an arm 69 .
- the counterweight may, for instance, be provided by a weight or by a length of heavy rod or pipe extending parallel to the associated prism 16 .
- FIGS. 12 to 15 employs single axis tracking, for each unit about an E-W axis, to track the sun as it moves relative to the earth during the course of the year.
- the units 63 are shown as independent of one another it will be understood that they would in practice be linked and would move synchronously.
- the numeral 34 . 7 in FIG. 15 designates solar rays refracted by a refractor 18 at mid-day for different latitude angles of the sun while the numeral 34 . 8 designates solar rays refracted by the refractor at times early and late in the day, for example 08h00 and 16h00, again for different latitude angles of the sun.
- an important advantage of these embodiments is the fact that internal reflection by the prisms ensures that radiation is evenly distributed across the receiving surfaces of the PV cells in electricity generating applications, and that shadows attributable to dirt particles on the lenses do not occur.
Abstract
The invention concerns a solar collector (10) which has at least one radiation-transmitting prism (16) which is wedge shaped in cross section. The prism has major side surfaces (20, 21) converging at an acute angle to a relatively narrow, operatively upper end (24). The opposite, lower end (26) of the prism is wider. A refractor (18) is arranged over the prism to refract solar radiation incident thereon onto the major side surfaces of the prism, as the sun moves relative to the earth, at angles allowing such radiation to enter the prism and be internally reflected therein towards a target at or adjacent the relatively wide end of the prism. The configuration allows high levels of solar concentration to be achieved.
Description
- THIS invention relates to solar collectors.
- There exist numerous devices designed to concentrate solar radiation for the purpose of generating electricity or heat. In the case of electricity generation, the function of the solar collector is to concentrate the radiation onto relatively small photovoltaic (PV) cells, while in the case of heat generation, the function of the collector is generally to concentrate the radiation onto a conduit or container conveying or storing a fluid, such as a liquid or gas, the temperature of which is to be elevated.
- In the known devices it is recognised that for efficient collection and concentration of the solar energy it is necessary for the device to track the sun as the position of the sun relative to the earth changes during the year and/or as the position of the sun relative to the earth changes during the day. A single-axis system aligned N-S (north-south) should track the sun E-W (east-west) during the day, while a single axis system aligned E-W should track the sun N-S during the year.
- Concentrator systems that employ focusing lenses for primary concentration require either biaxial tracking, i.e. both N-S and E-W, or a secondary tracking system that varies the position of the lens or target in order to ensure that the collected radiation is focused correctly on the target, i.e. PV cells or fluid conduit or container. The latter type of system, frequently referred to as a 1.5 times tracking system, typically moves the assembly of lenses, associated reflectors and/or target either individually or in arrays. The apparatus required to achieve such movement can however be expensive and complicated.
- Where electricity is to be generated with the use of PV cells an added disadvantage of systems which employ a focusing lens is the fact that dirt particles on the lens create shadows which result in uneven distribution of radiation on the PV cells. Apart from the fact that this reduces the efficiency of the PV cells, it can also cause permanent damage to the cells. Dirt particles on the reflectors of a reflector-type concentrating system can also be problematical.
- One example of a known solar collector, described in U.S. Pat. No. 4,282,862, uses an assembly of parallel wedges to reduce the angular dispersion of incident solar radiation. Radiation refracted by the wedges is then transported to the target by internal reflection in thin modules composed of wedge-shaped glass elements. A disadvantage of the system is however a relatively low concentration ratio of around 2:1. “Concentration ratio” refers to the ratio of the area of the solar aperture, i.e. the area on which the solar radiation is incident, to the area of the target onto which the radiation is concentrated. The low concentration ratio is indicative of a low level of efficiency. Another example, described in U.S. Pat. No. 4,344,417, makes use of a narrow, wedge-shaped collector to receive incident radiation and reflect it internally to the target area. The concentration ratio is however again relatively low, indicating a low level of efficiency.
- Further examples of prior art collectors are described in JP 11305130 and JP 62266879. In the former case, the collector has wedge-shaped prisms and external reflectors arranged at a divergent angle with respect to one another in order to collect radiation over a larger solar aperture and to concentrate such radiation, by both internal reflection in the prisms and external reflection from the reflectors, onto a solar battery. In the latter case N-S aligned, connected wedge-shaped prisms are again used to concentrate incident radiation by internal reflection. The prism assembly is used in conjunction with a conventional solar panel.
- It is an objective of the present invention to provide a novel and efficient solar collector.
- According to the present invention there is provided a solar collector capable of single axis tracking and comprising:
- at least one radiation-transmitting prism which is wedge shaped in cross section and which has major side surfaces converging at an acute angle to a relatively narrow, operatively upper end of the prism, the prism having an opposite, operatively lower, relatively wide end; and
- a refractor arranged over the prism to refract solar radiation incident thereon onto the major side surfaces of the prism, as the sun moves relative to the earth, at angles allowing such radiation to enter the prism and be internally reflected therein towards a target at or adjacent the relatively wide end of the prism.
- There will typically be a plurality of the prisms assembled side by side with their narrow ends extending parallel to one another, and the collector is preferably configured for single axis tracking in a plane transverse to the narrow ends of the prisms. In an arrangement in which the narrow ends of the prisms extend N-S in use, the collector is movable to track the sun in an E-W plane during the course of a day, typically with means for rotating the collector about a N-S axis. Alternatively, in an arrangement in which the narrow ends of the prisms extend E-W in use, the collector is movable to track the sun in a N-S plane during the course of a year, typically with means for rotating the collector about an E-W axis.
- The preferred refractor is a linear refractor, in particular a linear Fresnel lens.
- The narrow ends of the prisms may be adjacent to or in contact with the refractor, or they may be spaced from the refractor. In the latter case the collector may include a reflector arrangement configured to reflect radiation incident thereon at angles appropriate for acceptance thereof by the prism for internal reflection therein, such as an arrangement including convergent reflectors which stand up from the refractor over the narrow ends of the prisms and are arranged to reflect solar radiation outwardly onto the refractor.
- The collector may be located beneath a radiation transmitting cover, for instance in greenhouse or building heating application.
- For improved concentration of the solar radiation, the collector may include a radiation transmitting secondary solar concentrator at the wider end of each prism. This may have side walls, typically planar or concave, which converge towards one another to a width less than that of the wider end of the prism. The secondary solar collector should be made of a material with a higher refractive index than the material of which the prism is made. Also, the prism and secondary solar concentrator should meet one another at a curved, typically an upwardly convex, interface.
- The various embodiments of the invention described below can be used in an electricity generating mode in which case there will be a PV cell at the wider end of the prism or at the end of the secondary solar collector, or in a fluid heating mode in which case there will be a pipe conveying a fluid which is to be heated at the wider end of the prism or at the end of the secondary solar concentrator.
- The invention will now be described in more detail, by way of example only, with reference to the accompanying drawings.
- In the drawings:
-
FIG. 1 shows a diagrammatic plan view of a solar collector according to one embodiment of the invention; -
FIG. 2 shows a diagrammatic cross-section at the line 2-2 inFIG. 1 ; -
FIG. 3 shows an enlargement of the circled area inFIG. 2 ; -
FIG. 4 shows a cross-section at the line 4-4 inFIG. 1 ; -
FIG. 5 shows a diagrammatic plan view of a solar collector according to a second embodiment of the invention; -
FIG. 6 shows a diagrammatic cross-section at the line 6-6 inFIG. 5 ; -
FIG. 7 shows a cross-section at the line 7-7 inFIG. 5 ; -
FIG. 8 shows a diagrammatic plan view of a solar collector according to a third embodiment of the invention; -
FIG. 9 shows a diagrammatic cross-section at the line 9-9 inFIG. 8 ; -
FIG. 10 shows an enlargement of the cross-sectional view seen inFIG. 9 ; -
FIG. 11 shows a cross-section at the line 11-11 inFIG. 8 ; -
FIG. 12 shows a diagrammatic plan view of a solar collector according to a fourth embodiment of the invention; -
FIG. 13 shows a diagrammatic cross-section at the line 13-13 inFIG. 12 ; -
FIG. 14 shows a cross-section at the line 14-14 inFIG. 12 ; -
FIG. 15 shows an enlargement of the cross-sectional view seen inFIG. 13 ; and -
FIG. 16 illustrates a secondary solar concentrator which can be used in the embodiments illustrated in the earlier Figures. - In the Figures, the letters N, S, E and W refer respectively to north, south, east and west.
-
FIGS. 1 to 4 illustrate a first embodiment of solar collector according to this invention. It includes amodule 10 having arectangular bounding frame 12 which supports at anassembly 14 of side-by-side, parallel generally wedge-shapedprisms 16 of, for instance, glass, acrylic or polystyrene as well as alinear refractor 18, typically in the form of a linear Fresnel lens. Thelinear refractor 18, which may also be of glass, acrylic or polystyrene, is in use exposed to solar radiation and may include an ultraviolet (UV) filter. - The
individual prisms 16 are elongate both in a vertical sense and a horizontal sense. Referring in particular toFIG. 3 , each prism has major, planar side surfaces 20 and 21 which converge at anacute angle 22, in thiscase 3°, to one another towards a relativelynarrow end 24 of the prism. Theopposite end 26 of the prism is relatively wide and has mounted to it a series ofPV cells 28 arranged side by side with one another in a direction into the plane of the paper inFIG. 3 . The cells are in turn mounted in contact withaluminium heat sinks 30 which remove excess heat from the cells. The numeral 32 indicates an axis about which themodule 10 can be rotated. - In this embodiment, the narrow ends 24 of the prisms are attached to the underside of the linear refractor. Although the narrow ends are shown as sharp edges, they may in practice be slightly truncated.
- In
FIG. 1 , the prisms are arranged operationally with theirnarrow edges 24 extending N-S, and the linear refractor is designed to refract solar radiation incident thereon onto the major side surfaces 20 and 21 of the prisms. - The
numerals 34 inFIG. 3 indicate solar rays, assumed to be parallel when incident upon the linear refractor. During the course of each year, the sun moves relative to the earth, and themodule 10, in a N-S direction. With the sun at equinox solar rays 34.1 incident upon the linear refractor are refracted towards the lower, i.e.wider end 26 of the illustratedprism 16. The angle at which the rays fall upon themajor surface 20 of theprism 16 is within the acceptance angle of the prism, i.e. the rays enter the prism and are not externally reflected at the prism/air interface. As the sun moves towards the solstice positions during the course of the year the rays impinge at successively higher positions on thesurface 20 as exemplified by the numeral 34.2. In each case, rays which enter the prisms are totally internally reflected and are eventually incident upon thePV cells 28. To increase the acceptance angle of the prism, thesurfaces - For a prism having the given dimensions and a refractive index of 1.4, solar rays refracted at an
angle 36 will be within the acceptance angle of the prism and are accordingly received by the prism and internally reflected therein to be incident on the PV cells. Thus allrays 34 incident on the linear refractor over the givenlateral dimension 38 of 72 mm, corresponding to the solar aperture of themodule 10, will reach the PV cells. These cells have a lateral dimension of the order of 5 mm for the given prism dimensions. Thus themodule 10 provides a concentration ratio of 72 mm:5 mm, i.e. approximately 14:1. - It is perceived that with this relatively high concentration ratio, the
module 10 will be able to function very efficiently as a solar collector. - During the course of the day, the sun moves relative to the earth from an easterly to a westerly position. The
module 10 is rotated at the appropriate angular speed about theaxis 32 in order to track the sun during this relative movement. Thus the collector illustrated inFIGS. 1 to 4 requires single axis tracking only to take account of different solar angles during the course of the day. It is believed that it will be possible to achieve such single axis tracking in a simple, reliable and economical manner without the necessity for complicated arrangements to vary focal length as in 1.5 times tracking systems. - It will also be understood that for each latitude position of the sun, the solar rays are refracted parallel to one another on each side of the prism by the
linear refractor 18. Thus all solar rays incident on thelinear refractor 18 within the illustrated solar aperture, i.e. within thelateral dimension 38, will be concentrated onto thePV cells 28. The side by side spacing of theprisms 16 will accordingly be selected to ensure that all radiation incident on therefractor 18 is captured and concentrated. -
FIGS. 5 to 7 illustrate a second embodiment of the invention. In these Figures, components corresponding to those inFIGS. 1 to 4 are designated with the same reference numerals. - A major difference between the second embodiment and the first embodiment is the fact that the
narrow end 24 of each prism is spaced vertically below thelinear refractor 18. In this case, therefractor 18 is formed with a gap 40 aligned with the central, vertical axis of theprism 16, and the gap is spanned by areflector structure 42 composed ofupstanding reflector panels 44 arranged at an acute angle to one another. In this case solar rays 34.7 which would not be refracted by therefractor 18 at an angle acceptable to the prism, i.e. the rays would otherwise be externally reflected by thesurfaces solar aperture 38 to a dimension of 144 mm for the other, given dimensions. In this case, a concentration ratio in excess of 20:1, corresponding to high efficiency of the solar collector, can be obtained with relatively small additional cost attributable to the provision of thereflector structure 42. - In the embodiment of
FIGS. 5 to 7 the prisms are, as inFIG. 1 , aligned N-S and the facility is again provided for rotation about theN-S axis 32 in order to track the sun during the course of the day. -
FIGS. 8 to 11 illustrate a third embodiment. Once again, like components are designated by like numerals. In this case, theprisms 16 are aligned E-W and the facility is provided for N-S tracking. - The
linear refractors 18 are arranged in a curved shape as shown diagrammatically InFIG. 9 , within a light-transmittinggreenhouse dome 58. Referring toFIG. 10 , each prism is, as in the second embodiment, spaced some distance below arefractor 18. In this case, the target for each prism is a PVsolar cell 27 mounted on afluid pipe 28 through which a fluid such as water is conveyed. The wider end of the prism is connected to thepipe 28. The prism is connected to therefractor 18 by light transmitting side panels 50, possibly of acrylic, which also provide structural integrity. - The
pipe 28 is rotatable about its own E-W aligned axis in order to track the sun during the course of the year. Rotation of the pipe is accompanied by rotation of theprism 16 andrefractor 18. One or more counterweights (not shown) may also be provided to assist the rotational movement. The numerals 34.7 indicate solar rays refracted by therefractor 18 at mid-day for different latitude angles of the sun while the numerals 34.8 indicate solar rays refracted by the refractor at times early and late in the day, for example 08h00 and 16h00, again for different latitude angles of the sun. In the mid-day position, the rays are refracted to thewider end 26 of the prism while in the early morning and late afternoon positions, the rays are refracted to the narrow end of the prism. In each case, internal reflection within the prism transports the radiation to the target area. These solar positions are also indicated inFIG. 11 . - With the dimensions given in
FIGS. 8 to 11 , concentration ratios of the order of 28:1 can be obtained. - In another embodiment similar to that of
FIGS. 8 to 11 , pipe(s) 28 could be arranged to move in an arc, in a N-S plane as inFIG. 9 , as opposed to rotating. - The embodiments of
FIGS. 1 to 4 and 5 to 7 are described above in electricity generating applications. It will however be understood that such embodiments could also be used for water or other fluid heating duties, in which case the PV cells would be replaced by fluid transfer pipes, fluid containers or the like. It will also be understood that in this application there would be a requirement for fluid pipe connections able to take account of rotational movements about theaxis 32. The embodiment ofFIGS. 8 to 11 is considered particularly appropriate for fluid heating, particularly in situations where thepipe 28 rotates about its axis and accordingly does not change position. - In other embodiments of the invention, not illustrated, PV cells could be embedded during moulding in the wider ends of the
prisms 16. -
FIG. 16 illustrates a modification in which a secondary solar radiation concentrator is indicated by thereference numeral 70. Theconcentrator 70, which extends for the full length of theprism 16, is a solid or liquid body made of a material having a higher refractive index than the material of which the prism is made. In one example, the prism is made of an acrylic, such as PMMA (Polymethyl methacrylate) having a refractive index of less than 1.5 and thesecondary concentrator 70 of polystyrol or glass having a refractive index of more than 1.5. - The secondary concentrator is placed at the wider, lower end of the
prism 16 and is intimately connected to the prism at an upwardly convex interface defined by aconvex surface 72 of the secondary concentrator and aconcave surface 74 of the prism. Thesecondary concentrator 70 has planar side surfaces 76 and 78 and a planar lower surface 80 to which, in this example, a heat transmitting coupler 81 is intimately attached. The coupler 81 is in intimate contact with thepipe 28. - The numeral 82 indicates a solar ray which enters the
prism 16 through theside surface 20, is refracted at the prism/air interface and travels through the lower part of the prism to the convex interface between the prism and thesecondary concentrator 70. At this interface the ray is refracted into the secondary concentrator and is thereafter reflected internally for eventual impingement on the coupler 81. It will be understood that other solar rays that have been internally reflected in the prism will likewise be refracted into thesecondary concentrator 70 for subsequent passage directly or through internal reflection onto the coupler. - To ensure that rays which enter the
secondary concentrator 70 are reflected onto the coupler 81, inwardly facing mirrors 84 (only one shown) may be placed against thesurfaces - Instead of side surfaces 76 and 78 which are planar, the side surfaces of the secondary concentrator may be concave as indicated diagrammatically by the numeral 86, or convex.
- The convex interface defined by the
surfaces - As exemplified above it is preferred that the refractive index of the SCC be greater than that of the
prism 16 in order to ensure that solar rays are appropriately refracted. - It will be understood that the SCC seen in
FIG. 16 will increase the concentration ratio further, implying high levels of solar concentration efficiency. It will furthermore be understood that the SCC could equally well be used to achieve highly efficient concentration of solar radiation onto a PV cell in place of the coupler 81 andpipe 28 in electricity generating applications. - SCCs such as that described above can be used in conjunction with the
prisms 16 in any of the embodiments seen in the drawings. -
FIGS. 12 to 15 illustrate another embodiment of the invention in whichSCCs 70 are used. In this embodiment, the numeral 60 indicates an enclosure mounted for example in a fixed position on a building (not shown). The enclosure 60 has a light-transmitting roof panel 62, possibly made of glass or a fluoropolymer.Solar collection units 63, each including alinear refractor 18,prism 16 andSCC 70, are supported by bearings 64 fixed in spaced metal frames 66. In each case a heat pipe is rotatable in the associated bearing and thelinear refractor 18 is supported by support arms or radiation-transmittingsheets 67. Each unit includes a counterweight 68 connected to the associated heat pipe by anarm 69. The counterweight may, for instance, be provided by a weight or by a length of heavy rod or pipe extending parallel to the associatedprism 16. - Like the embodiment of
FIGS. 8 to 11 , the embodiment ofFIGS. 12 to 15 employs single axis tracking, for each unit about an E-W axis, to track the sun as it moves relative to the earth during the course of the year. Although theunits 63 are shown as independent of one another it will be understood that they would in practice be linked and would move synchronously. - As in
FIG. 10 the numeral 34.7 inFIG. 15 designates solar rays refracted by arefractor 18 at mid-day for different latitude angles of the sun while the numeral 34.8 designates solar rays refracted by the refractor at times early and late in the day, for example 08h00 and 16h00, again for different latitude angles of the sun. - Apart from the simplicity of the single axis tracking systems which are employed in the embodiments described above, and the high concentration ratios and favourable efficiency which can be obtained with such embodiments, an important advantage of these embodiments, compared to known system using focusing lenses, is the fact that internal reflection by the prisms ensures that radiation is evenly distributed across the receiving surfaces of the PV cells in electricity generating applications, and that shadows attributable to dirt particles on the lenses do not occur.
Claims (27)
1. A solar collector comprising:
at least one radiation-transmitting prisms which is wedge-shaped in cross-section and which has major side surfaces converging at an acute angle to a relatively narrow end of the prism, having an opposite, relatively wide end; and
a refractor arranged over the prism to refract solar radiation incident thereon onto the major side surfaces of the prism, as the sun moves relative to the earth, at angles allowing such radiation to enter the prism and be internally reflected therein towards a target at or adjacent the relatively wide end of the prism.
2. A solar collector according to claim 1 comprising a plurality of the prisms assembled side by side with their narrow ends extending parallel to one another.
3. A solar collector according to claim 2 wherein the collector is configured for single axis tracking in a plane transverse to the narrow ends of the prisms.
4. A solar collector according to claim 3 wherein the narrow ends of the prisms extend N-S in use and the collector is movable to track the sun in an E-W plane during the course of a day.
5. A collector according to claim 4 comprising means for rotating the collector about a N-S axis.
6. A solar collector according to claim 3 wherein the narrow ends of the prisms extend E-W in use and the collector is movable to track the sun in a N-S plane during the course of a year.
7. A solar collector according to claim 6 comprising means for rotating the collector about an E-W axis.
8. A solar collector according to claim 1 wherein the refractor is a linear refractor.
9. A solar collector according to claim 8 wherein the refractor is a linear Fresnel lens.
10. A solar collector according to claim 1 wherein the narrow ends of the prisms are adjacent to or in contact with the refractor.
11. A solar collection according to claim 1 wherein the narrow ends of the prism's are spaced from the linear refractor.
12. A solar collector according to claim 11 wherein the collector includes a reflector arrangement to reflect radiation incident thereon at angles appropriate for acceptance thereof by the prism for internal reflection therein.
13. A solar collector according to claim 12 wherein the reflector arrangement comprises convergent reflectors which stand up from the refractor over the narrow ends of the prisms and are arranged to reflect solar radiation outwardly onto the refractor.
14. A solar collector according to claim 2 wherein the collector is located beneath a radiation transmitting cover.
15. A solar collector according to claim 2 wherein the prisms are spaced from the refractor and are connected to the refractor by radiation-transmitting side panels.
16. A solar collector according to claim 1 comprising a radiation transmitting secondary solar concentrator at the wider end of each prism.
17. A solar collector according to claim 16 wherein the secondary solar concentrator has side walls which converge towards one another to a width less than that of the wider end of the prism.
18. A solar collector according to claim 17 wherein the side walls are planar or concave.
19. A solar collector according to claim 16 wherein the secondary solar collector is made of a material with a higher refractive index than the material of which the prism is made.
20. A solar collector according to claim 17 wherein the prism and secondary solar concentrator meet one another at a curved interface.
21. A solar collector according to claim 20 wherein a convex surface of the secondary solar concentrator mates with a concave surface of the prism at the interface.
22. A solar collector according to claim 1 comprising a PV cell at the wider end of each prism.
23. A solar collector according to claim 16 comprising a PV cell at an end of the secondary solar collector remote from the prism.
24. A solar collector according to claim 1 comprising a pipe conveying a fluid which is to be heated at the wider end of the prism.
25. A solar collector according to claim 16 comprising a pipe conveying a fluid which is to be heated at an end of the secondary solar concentrator remote from the prism.
26. A solar collector according to claim 1 wherein each prism is made of glass, acrylic or polystyrene.
27. A solar collector according to claim 16 comprising a pipe conveying a fluid which is to be heated at an end of the secondary solar concentrator remote from the prism.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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ZA200606274 | 2006-07-28 | ||
ZA2006/06274 | 2006-07-28 | ||
ZA2006-08651 | 2006-10-17 | ||
ZA200608651 | 2006-10-17 | ||
PCT/IB2007/052984 WO2008012779A2 (en) | 2006-07-28 | 2007-07-27 | Solar collectors |
Publications (1)
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US20090301469A1 true US20090301469A1 (en) | 2009-12-10 |
Family
ID=38981865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/375,508 Abandoned US20090301469A1 (en) | 2006-07-28 | 2007-07-27 | Solar collectors |
Country Status (3)
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US (1) | US20090301469A1 (en) |
EP (1) | EP2052195A2 (en) |
WO (1) | WO2008012779A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100307480A1 (en) * | 2006-07-28 | 2010-12-09 | Angus Muir Edington Scrimgeour | Non-tracking solar collectors |
US20110083664A1 (en) * | 2009-10-13 | 2011-04-14 | William James Todd | Collecting solar radiation using fresnel shifting |
US9509247B1 (en) * | 2015-08-07 | 2016-11-29 | David Fredrick Hinson | Greenhouse used as a solar panel support structure |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0911514D0 (en) * | 2009-07-02 | 2009-08-12 | The Technology Partnership Plc | Solar concentrator |
CN110832259A (en) * | 2017-08-04 | 2020-02-21 | 博立多媒体控股有限公司 | Vertical solar device |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2913583A (en) * | 1956-04-20 | 1959-11-17 | Hoffman Electronics Corp | Solar tracking system or the like |
US3467840A (en) * | 1966-07-05 | 1969-09-16 | Melvin Weiner | Solar thermionic convertor |
US4108540A (en) * | 1976-06-17 | 1978-08-22 | Minnesota Mining And Manufacturing Company | Refractor-reflector radiation concentrator |
US5554229A (en) * | 1995-02-21 | 1996-09-10 | United Solar Systems Corporation | Light directing element for photovoltaic device and method of manufacture |
US5877874A (en) * | 1995-08-24 | 1999-03-02 | Terrasun L.L.C. | Device for concentrating optical radiation |
US5977478A (en) * | 1996-12-05 | 1999-11-02 | Toyota Jidosha Kabushiki Kaisha | Solar module |
US6061181A (en) * | 1997-06-09 | 2000-05-09 | Fereidooni; Fred | Nontracking light converger |
US6104446A (en) * | 1996-12-18 | 2000-08-15 | Blankenbecler; Richard | Color separation optical plate for use with LCD panels |
US6256153B1 (en) * | 1999-08-11 | 2001-07-03 | Souhei Suzui | Circumscribing ray route lens, the system condensing light therewith, and the lighting therewith |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2549242B1 (en) * | 1983-06-27 | 1986-09-26 | Opthra | METHOD AND OPTICAL DEVICE FOR CONCENTRATING RADIANT ENERGY ON A RECEIVING ELEMENT, AND APPLICATION TO CAPTURING ENERGY SUCH AS SOLAR ENERGY |
US5255666A (en) * | 1988-10-13 | 1993-10-26 | Curchod Donald B | Solar electric conversion unit and system |
DE4111608A1 (en) * | 1991-04-10 | 1992-10-15 | En Techno Grimm Gmbh | Hybrid solar radiation collector - has tubular absorber, surrounded by optical elements to deflect and concentrate sunlight |
RU2154777C1 (en) * | 2000-01-24 | 2000-08-20 | Всероссийский научно-исследовательский институт электрификации сельского хозяйства | Solar photoelectric module with concentrator |
JP2002031035A (en) * | 2000-07-13 | 2002-01-31 | Yozo Oko | Solar power generator |
-
2007
- 2007-07-27 EP EP07805251A patent/EP2052195A2/en not_active Withdrawn
- 2007-07-27 WO PCT/IB2007/052984 patent/WO2008012779A2/en active Application Filing
- 2007-07-27 US US12/375,508 patent/US20090301469A1/en not_active Abandoned
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2913583A (en) * | 1956-04-20 | 1959-11-17 | Hoffman Electronics Corp | Solar tracking system or the like |
US3467840A (en) * | 1966-07-05 | 1969-09-16 | Melvin Weiner | Solar thermionic convertor |
US4108540A (en) * | 1976-06-17 | 1978-08-22 | Minnesota Mining And Manufacturing Company | Refractor-reflector radiation concentrator |
US5554229A (en) * | 1995-02-21 | 1996-09-10 | United Solar Systems Corporation | Light directing element for photovoltaic device and method of manufacture |
US5877874A (en) * | 1995-08-24 | 1999-03-02 | Terrasun L.L.C. | Device for concentrating optical radiation |
US5977478A (en) * | 1996-12-05 | 1999-11-02 | Toyota Jidosha Kabushiki Kaisha | Solar module |
US6104446A (en) * | 1996-12-18 | 2000-08-15 | Blankenbecler; Richard | Color separation optical plate for use with LCD panels |
US6061181A (en) * | 1997-06-09 | 2000-05-09 | Fereidooni; Fred | Nontracking light converger |
US6256153B1 (en) * | 1999-08-11 | 2001-07-03 | Souhei Suzui | Circumscribing ray route lens, the system condensing light therewith, and the lighting therewith |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100307480A1 (en) * | 2006-07-28 | 2010-12-09 | Angus Muir Edington Scrimgeour | Non-tracking solar collectors |
US20110083664A1 (en) * | 2009-10-13 | 2011-04-14 | William James Todd | Collecting solar radiation using fresnel shifting |
US9509247B1 (en) * | 2015-08-07 | 2016-11-29 | David Fredrick Hinson | Greenhouse used as a solar panel support structure |
Also Published As
Publication number | Publication date |
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WO2008012779A3 (en) | 2008-06-26 |
WO2008012779A2 (en) | 2008-01-31 |
EP2052195A2 (en) | 2009-04-29 |
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