WO2009148344A1 - Quasi-stationary solar concentrators with vacuum tubes or fins and non stationary optics - Google Patents

Quasi-stationary solar concentrators with vacuum tubes or fins and non stationary optics Download PDF

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Publication number
WO2009148344A1
WO2009148344A1 PCT/PT2009/000030 PT2009000030W WO2009148344A1 WO 2009148344 A1 WO2009148344 A1 WO 2009148344A1 PT 2009000030 W PT2009000030 W PT 2009000030W WO 2009148344 A1 WO2009148344 A1 WO 2009148344A1
Authority
WO
WIPO (PCT)
Prior art keywords
optic
tube
stationary
solar
solar concentrating
Prior art date
Application number
PCT/PT2009/000030
Other languages
French (fr)
Inventor
Manuel Pedro Ivens Collares Pereira
Wildor Maldonado Carbajal
João Correia de OLIVEIRA
Original Assignee
Ao Sol - Energias Renováveis, S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ao Sol - Energias Renováveis, S.A. filed Critical Ao Sol - Energias Renováveis, S.A.
Publication of WO2009148344A1 publication Critical patent/WO2009148344A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
    • F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
    • 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
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/74—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with trough-shaped or cylindro-parabolic reflective surfaces
    • 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
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/80—Arrangements for concentrating solar-rays for solar heat collectors with reflectors having discontinuous faces
    • 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
    • F24S30/425—Horizontal axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/50—Preventing overheating or overpressure
    • F24S40/52—Preventing overheating or overpressure by modifying the heat collection, e.g. by defocusing or by changing the position of heat-receiving elements
    • 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
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S2023/83—Other shapes
    • F24S2023/838—Other shapes involutes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/80—Accommodating differential expansion of solar collector elements
    • F24S40/85—Arrangements for protecting solar collectors against adverse weather conditions
    • 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

Definitions

  • the present invention relates, in general, to solar radiation concentrating collectors and more specifically to solar radiation concentrators made up with optics that track the apparent daily motion of the sun in order to maximize collected energy but keeping the absorbers fully stationary and at the same time providing total protection of the reflecting surfaces and of the absorber during nocturnal periods or diurnal ones when the system might not be operating, with or without solar radiation availability.
  • Vacuum tubes are placed side by side to form an absorption surface as large as desired. Sometimes they are complemented with diffusing or reflecting surfaces, placed behind in a fixed, stationary, form, to recuperate some of the incident radiation that, otherwise, would escape in between the tubes, or in order to concentrate it.
  • US-A- 395 7031 patent discloses solar collectors for which the referred surfaces have specific optical configurations, by using forms with incident radiation collecting properties known as involutes, partial or total ones. In that case as it is known from patents US-A-3957031, US-A-4003638 and US-A- 4230095 they may even be a part of CPC type concentrators.
  • These reflecting/diffusing surfaces flat or curved, have in common the fact that they get close to the point of being in contact with the referred tubes and they constitute, together with said tubes, solar concentrating collectors of the stationary type, /. e. , they are fixed to a structure and/or a roof.
  • the concept also applies to fins (absorbing surfaces, in general flat ones or constituted by flat elements and associated to tubes where the fluid to be heated is circulated, as described in the Portuguese Patent N 0 102938, "Low concentration Solar collector, ideal, of the CPC type” and European Patent EP 0678714 Bl "Solar energy collector of the non-evacuated compound parabolic concentrator type” .
  • the object of the present invention is to resolve the drawbacks/problems referred above, using non- stationary optics.
  • the used optics move individually around the tubes upon which they concentrate the incident solar radiation, in such a way that in all moments of the day and night when the system is not operating, these become protected, and at the same time also will the reflecting surfaces, since it will be their other side that will be exposed, if during the day, to solar radiation.
  • the reflectors may track the sun's apparent motion by turning around each tube and effectively concentrating and collecting a larger quantity of solar radiation than the one that would be collected by an equivalent set of stationary reflectors and tubes.
  • the present invention relates to a solar concentrating collector comprising evacuated or non evacuated tubular absorber elements, characterized by comprising at least one tube and one optic or trough associated to each tube, and by comprising for each tube at least one said optic connected to means to make it rotate according to the sun's apparent motion.
  • said solar concentrating collector is characterized by the optic rotating so that its reflecting surface and said tube/fin absorber keep protected against unnecessary outdoors exposure.
  • said solar concentrating collector is characterized by the means which is connected to said optic and able to provide said rotational movement to said optic, comprising a ring system with or without roller- bearings.
  • said concentrating solar collector is characterized by the means which is able to provide said rotational movement to said optic comprising a system of magnets.
  • the said solar concentrating collector is characterized by the means which is able to provide said rotational movement to said optic further comprising a toothed gear and corresponding worm screw type mechanical system, powered by an electrical motor.
  • Fig. 1 shows a cross section of a set of tubes 11 and mirrors 12 of the CPC type, with a reflecting surface 13 according to the present invention.
  • Fig. 2 shows a view of the mirror 12 of Fig. 1, but now fully rotated 21.
  • Fig. 3 shows, according to the present invention, the mirrors of the preceding figures, with their reflecting surfaces 32 in intermediate positions 31.
  • Fig. 4 shows one embodiment of the reflecting unit with troughs 41, ends 42 and reflecting surfaces 43.
  • Fig. 5 shows an embodiment of the invention with a vacuum tube 11 having a ring system with roller-bearings, with a fixed part 51 and a moving part 52.
  • Fig.6 shows an embodiment of the present invention with a fin used in non evacuated collectors where troughs 41 of Fig.4 rotate around the fluid circulation tube 61.
  • Fig. 7a shows an embodiment which has a system of magnets 62 permanently mounted in the moving part 52 of the rings and electromagnetic magnets 63 mounted on the fixed part 51 of those rings.
  • Fig.7b shows in yet another embodiment of the present invention a toothed gear 64 engaged in a corresponding stick 65 having teeth 66 and driven by an electrical motor 67.
  • a cross sectional view of a set of tubes 11 and CPC type mirrors 12 is shown, the mirrors being individually associated with each tube and concentrating on each tube the incident radiation reflected by the reflecting face 13 of said mirrors 12.
  • Fig. 2 shows the same mirror 12 of Fig.l, but now in a preferred embodiment according to the present invention, completely rotated, 21, into a position in which the reflecting surface 22 is facing down and in which the tubes 11 and said surface 22 become totally protected from the potential aggression of external factors, such as solar radiation, whether and the like.
  • the reflectors from the preceding figures were rotated to an intermediate 31 position, in which their reflecting faces 32 exposed to the sun with the most favourable angle for the maximization of the energy collected.
  • Fig. 4 shows an embodiment of the reflecting unit with troughs 41 and ends 42, comprising openings for the passage of the vacuum tubes 11 and for fixation thereof; these ends may be comprised with reflecting surfaces 43 to increase the radiation reflection capacity.
  • Fig.5 shows, in a preferred embodiment according to the invention, a system of rings 51, 52 with or without roller-bearings, comprising a fixed part 51 connected to said vacuum tubes 11 and a moving part 52 connected to said ends of troughs 41 and 42 of Fig. 4.
  • This system allows for the rotating motion of the reflecting unit.
  • Fig. 6 shows an embodiment of the present invention fully assembled, in which the troughs of Fig 4 rotate now around the fluid circulation tube 61 defining a typical fin found in non evacuated collectors.
  • Fig. 7a shows an embodiment of a way to rotate the reflecting troughs 41 by means of a magnet system comprising permanent magnets 62 asymmetrically assembled on the ring moving part 52 and electromagnetically magnets 63 assembled on the ring fixed part 51 which get magnetized in an orderly fashion in order to displace the trough to any required position due the magnetic forces between permanent and electromagnetic magnets.
  • Fig. 7b shows another embodiment of a way to rotate the reflecting troughs 41 by means of a toothed gear 64 completed by the matching stick 65 with teeth 66 and driven by an electrical motor 67.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Photovoltaic Devices (AREA)

Abstract

This invention relates to a solar concentrating collector, either having evacuated type tubular absorbers or not, characterized by comprising at least one tube (11) and one optic or trough (41) connected to each tube (11), and by comprising on each tube (11) at least one said optic (41) connected to means (51, 52, 62, 63, 64, 65, 67) to rotate said optic (41) according to the sun apparent motion in order to collect the maximum amount of incident radiation and to protect it, when necessary, against unnecessary outdoors exposure.

Description

"QUASI-STATIONARY SOLAR CONCENTRATORS WITH VACUUM TUBES
OR FINS AND NON STATIONARY OPTICS"
FIELD OF THE INVENTION
The present invention relates, in general, to solar radiation concentrating collectors and more specifically to solar radiation concentrators made up with optics that track the apparent daily motion of the sun in order to maximize collected energy but keeping the absorbers fully stationary and at the same time providing total protection of the reflecting surfaces and of the absorber during nocturnal periods or diurnal ones when the system might not be operating, with or without solar radiation availability.
BACKGROUND OF THE INVENTION
The sites http://www.himin.com/english/index.html and http://www.sunraienergy.com/ describe solar collectors with vacuum tubes that constitute today the largest solar energy market for thermal applications under 1000C, mainly in China.
Vacuum tubes are placed side by side to form an absorption surface as large as desired. Sometimes they are complemented with diffusing or reflecting surfaces, placed behind in a fixed, stationary, form, to recuperate some of the incident radiation that, otherwise, would escape in between the tubes, or in order to concentrate it.
US-A- 395 7031 patent discloses solar collectors for which the referred surfaces have specific optical configurations, by using forms with incident radiation collecting properties known as involutes, partial or total ones. In that case as it is known from patents US-A-3957031, US-A-4003638 and US-A- 4230095 they may even be a part of CPC type concentrators.
These reflecting/diffusing surfaces, flat or curved, have in common the fact that they get close to the point of being in contact with the referred tubes and they constitute, together with said tubes, solar concentrating collectors of the stationary type, /. e. , they are fixed to a structure and/or a roof.
This fact renders them particularly vulnerable, since the reflectors have a tendency for rapid deterioration with the weather, since they are exposed to rain, dust and other potential contaminants, which make them loose reflectivity, sometimes susceptible of recovery through cleaning, otherwise irretrievably lost since it is the result of a chemical alteration of the optical properties. Thus these collectors instead of lasting for 15 to 20 years, desirable in solar collectors, have lifetimes, in good conditions, below 5 to 6 years.
The alternative of placing the set under a transparent cover, for instance a flat glass, solves this problem but deteriorates/penalizes in more than one way the optical behaviour of the set and although it has been proposed as described in sites like http://www.solargenix.com/building products. cfm and http://www.solargenixchicago.com/solarthermalproducts.cfm and when used it is a penalizing solution.
Additionally, in case of a strong solar exposition, absence of energy extraction and/or lack of circulation pump, these collectors attain very high temperatures (stagnation) which are the cause of several durability related problems and even of potential hazards.
In an embodiment of the present invention, the concept also applies to fins (absorbing surfaces, in general flat ones or constituted by flat elements and associated to tubes where the fluid to be heated is circulated, as described in the Portuguese Patent N0 102938, "Low concentration Solar collector, ideal, of the CPC type" and European Patent EP 0678714 Bl "Solar energy collector of the non-evacuated compound parabolic concentrator type" .
The object of the present invention is to resolve the drawbacks/problems referred above, using non- stationary optics.
SUMMARY OF THE INVENTION
In the present invention, the used optics move individually around the tubes upon which they concentrate the incident solar radiation, in such a way that in all moments of the day and night when the system is not operating, these become protected, and at the same time also will the reflecting surfaces, since it will be their other side that will be exposed, if during the day, to solar radiation.
In use, during collection of solar energy, the reflectors may track the sun's apparent motion by turning around each tube and effectively concentrating and collecting a larger quantity of solar radiation than the one that would be collected by an equivalent set of stationary reflectors and tubes.
The present invention relates to a solar concentrating collector comprising evacuated or non evacuated tubular absorber elements, characterized by comprising at least one tube and one optic or trough associated to each tube, and by comprising for each tube at least one said optic connected to means to make it rotate according to the sun's apparent motion.
In an embodiment of the invention, said solar concentrating collector is characterized by the optic rotating so that its reflecting surface and said tube/fin absorber keep protected against unnecessary outdoors exposure. In another embodiment of the invention, said solar concentrating collector is characterized by the means which is connected to said optic and able to provide said rotational movement to said optic, comprising a ring system with or without roller- bearings.
In yet another embodiment of the invention, said concentrating solar collector is characterized by the means which is able to provide said rotational movement to said optic comprising a system of magnets.
In another embodiment of the present invention the said solar concentrating collector is characterized by the means which is able to provide said rotational movement to said optic further comprising a toothed gear and corresponding worm screw type mechanical system, powered by an electrical motor.
BRIEF DESCRIPTION OF THE FIGURES
Other aspects and advantages of the invention will be apparent from the following detailed description and the drawings which illustrate, by way of example, the features of the invention.
Fig. 1 shows a cross section of a set of tubes 11 and mirrors 12 of the CPC type, with a reflecting surface 13 according to the present invention.
Fig. 2 shows a view of the mirror 12 of Fig. 1, but now fully rotated 21.
Fig. 3 shows, according to the present invention, the mirrors of the preceding figures, with their reflecting surfaces 32 in intermediate positions 31.
Fig. 4 shows one embodiment of the reflecting unit with troughs 41, ends 42 and reflecting surfaces 43. Fig. 5 shows an embodiment of the invention with a vacuum tube 11 having a ring system with roller-bearings, with a fixed part 51 and a moving part 52.
Fig.6 shows an embodiment of the present invention with a fin used in non evacuated collectors where troughs 41 of Fig.4 rotate around the fluid circulation tube 61.
Fig. 7a shows an embodiment which has a system of magnets 62 permanently mounted in the moving part 52 of the rings and electromagnetic magnets 63 mounted on the fixed part 51 of those rings.
Fig.7b shows in yet another embodiment of the present invention a toothed gear 64 engaged in a corresponding stick 65 having teeth 66 and driven by an electrical motor 67.
DETAILED DESCRIPTION OF THE INVENTION
With relation to Fig.l , a cross sectional view of a set of tubes 11 and CPC type mirrors 12 is shown, the mirrors being individually associated with each tube and concentrating on each tube the incident radiation reflected by the reflecting face 13 of said mirrors 12.
Fig. 2 shows the same mirror 12 of Fig.l, but now in a preferred embodiment according to the present invention, completely rotated, 21, into a position in which the reflecting surface 22 is facing down and in which the tubes 11 and said surface 22 become totally protected from the potential aggression of external factors, such as solar radiation, whether and the like. With relation to Fig 3, the reflectors from the preceding figures were rotated to an intermediate 31 position, in which their reflecting faces 32 exposed to the sun with the most favourable angle for the maximization of the energy collected.
Fig. 4 shows an embodiment of the reflecting unit with troughs 41 and ends 42, comprising openings for the passage of the vacuum tubes 11 and for fixation thereof; these ends may be comprised with reflecting surfaces 43 to increase the radiation reflection capacity.
Fig.5 shows, in a preferred embodiment according to the invention, a system of rings 51, 52 with or without roller-bearings, comprising a fixed part 51 connected to said vacuum tubes 11 and a moving part 52 connected to said ends of troughs 41 and 42 of Fig. 4. This system allows for the rotating motion of the reflecting unit.
Fig. 6 shows an embodiment of the present invention fully assembled, in which the troughs of Fig 4 rotate now around the fluid circulation tube 61 defining a typical fin found in non evacuated collectors.
Fig. 7a shows an embodiment of a way to rotate the reflecting troughs 41 by means of a magnet system comprising permanent magnets 62 asymmetrically assembled on the ring moving part 52 and electromagnetically magnets 63 assembled on the ring fixed part 51 which get magnetized in an orderly fashion in order to displace the trough to any required position due the magnetic forces between permanent and electromagnetic magnets.
Fig. 7b shows another embodiment of a way to rotate the reflecting troughs 41 by means of a toothed gear 64 completed by the matching stick 65 with teeth 66 and driven by an electrical motor 67. The person skilled in the art will understand that the present invention may be subject to several modifications and alternatives without departing from the scope of the attached claims.

Claims

1. Solar concentrating collector comprising absorbing tubular elements of the evacuated or non evacuated type, characterized by comprising at least one tube
(11) and an optic or trough (41) associated to each tube (11) and by comprising for each tube (11) at least one said optic (41) connected to means (51, 52, 62, 63,
64, 66, 67) to rotate said optics (41) according to the sun apparent motion.
2. Solar concentrating collector according to claim 1 characterized by said concentrating optic (41) rotating so as to its reflecting surface (13) and said associated absorbing tube/fin (11), become protected against unnecessary outdoors exposure.
3. Solar concentrating collector according to claim 1 characterized by the mechanical means connected to said optic (41) and able to enable said rotation movement of said optic (41), comprising a ring system (51, 52) with or without roller-bearings.
4. Solar concentrating collector according to claim 1 characterized by the means which is able to provide said rotation movement of said optic (41) comprising a magnet system (62, 63).
5. Solar concentrating collector according to claim 1, characterized by the means which is able to provide said rotation movement of said optic (41) further comprising a toothed gear (64) and corresponding toothed worm screw (66) type mechanical system associated to an electrical motor (67).
PCT/PT2009/000030 2008-06-02 2009-06-02 Quasi-stationary solar concentrators with vacuum tubes or fins and non stationary optics WO2009148344A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PT104084A PT104084A (en) 2008-06-02 2008-06-02 SOLAR COLLECTORS QUASI-STATIONARY CONCENTRATORS WITH VACUUM TUBES OR HOOKS AND NON-STATIONARY OPTICS
PT104084 2008-06-02

Publications (1)

Publication Number Publication Date
WO2009148344A1 true WO2009148344A1 (en) 2009-12-10

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102353162A (en) * 2011-08-18 2012-02-15 皇明太阳能股份有限公司 Shading and condensing device for vacuum tube
ITMI20102013A1 (en) * 2010-10-28 2012-04-29 Project & Service S A S PROTECTION OF SOLAR COLLECTORS WITH INDIVIDUAL MODULES FOR EVERY ABSORPTION TUBE
CN103776178A (en) * 2014-01-10 2014-05-07 西安建筑科技大学 Passive protecting type evacuated tube collector high in light condensation efficiency
CN105333624A (en) * 2015-11-06 2016-02-17 海宁光泰太阳能工业有限公司 Solar heat collecting vacuum pipe
CN110440460A (en) * 2019-08-15 2019-11-12 李梦珠 A kind of dynamic anti-air drying solar energy heat collection pipe of magnetic
CN110500791A (en) * 2019-08-16 2019-11-26 吴鹏 A kind of self-cleaning type solar energy heat collection pipe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027653A (en) * 1975-10-10 1977-06-07 Gershon Meckler Solar energy collector
US4210463A (en) * 1977-07-11 1980-07-01 Escher William J D Multimode solar energy collector and process
US20020007830A1 (en) * 2000-07-11 2002-01-24 Heiji Fukutake Radiation heat collector
WO2005124245A2 (en) * 2004-06-21 2005-12-29 Valsecchi, Alfredo Reflecting solar concentrator for the generation of electrical energy
DE102005010461A1 (en) * 2004-12-04 2006-06-08 Deutsches Zentrum für Luft- und Raumfahrt e.V. Solar collector, has protective screen rotatable around vacuum tube between two positions, where screen shields tube against solar radiation in one position, and screen exposes tube to solar radiation in another position

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027653A (en) * 1975-10-10 1977-06-07 Gershon Meckler Solar energy collector
US4210463A (en) * 1977-07-11 1980-07-01 Escher William J D Multimode solar energy collector and process
US20020007830A1 (en) * 2000-07-11 2002-01-24 Heiji Fukutake Radiation heat collector
WO2005124245A2 (en) * 2004-06-21 2005-12-29 Valsecchi, Alfredo Reflecting solar concentrator for the generation of electrical energy
DE102005010461A1 (en) * 2004-12-04 2006-06-08 Deutsches Zentrum für Luft- und Raumfahrt e.V. Solar collector, has protective screen rotatable around vacuum tube between two positions, where screen shields tube against solar radiation in one position, and screen exposes tube to solar radiation in another position

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20102013A1 (en) * 2010-10-28 2012-04-29 Project & Service S A S PROTECTION OF SOLAR COLLECTORS WITH INDIVIDUAL MODULES FOR EVERY ABSORPTION TUBE
CN102353162A (en) * 2011-08-18 2012-02-15 皇明太阳能股份有限公司 Shading and condensing device for vacuum tube
CN103776178A (en) * 2014-01-10 2014-05-07 西安建筑科技大学 Passive protecting type evacuated tube collector high in light condensation efficiency
CN105333624A (en) * 2015-11-06 2016-02-17 海宁光泰太阳能工业有限公司 Solar heat collecting vacuum pipe
CN110440460A (en) * 2019-08-15 2019-11-12 李梦珠 A kind of dynamic anti-air drying solar energy heat collection pipe of magnetic
CN110500791A (en) * 2019-08-16 2019-11-26 吴鹏 A kind of self-cleaning type solar energy heat collection pipe
CN110500791B (en) * 2019-08-16 2021-04-20 湖州瑞讯机电设备有限公司 Self-cleaning solar heat collecting tube

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