WO2015069199A1 - A heat collector tube - Google Patents
A heat collector tube Download PDFInfo
- Publication number
- WO2015069199A1 WO2015069199A1 PCT/TR2014/000149 TR2014000149W WO2015069199A1 WO 2015069199 A1 WO2015069199 A1 WO 2015069199A1 TR 2014000149 W TR2014000149 W TR 2014000149W WO 2015069199 A1 WO2015069199 A1 WO 2015069199A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- heat collector
- fluid
- collector tube
- interior barrier
- Prior art date
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
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
- F24S2010/71—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits the conduits having a non-circular cross-section
-
- 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
Definitions
- the present invention relates to heat collector tubes employed in solar thermal energy systems.
- Solar thermal energy systems In solar thermal energy systems, rays from the sun are sent to a heat collector tube by reflector surfaces so that a fluid flown through the heat collector tube is heated up.
- Solar thermal energy systems are basically divided into two groups according to the type of the fluid flown through the heat collector tube.
- a fluid with a high heat retention capacity is flown through the heat collector tube.
- the fluid which is heated up is outlet from the solar thermal energy system and is used to heat water (or a similar fluid) in a source so as to yield steam having a high temperature and pressure.
- the steam is used to run a steam turbine, for instance, to generate electrical energy.
- the temperature of the fluid flown through the heat collector tube has to be kept at the highest temperature possible. Therefore, the heat collector tube is coated using special materials in order to absorb the sunrays received from the reflectors in an efficient manner.
- the temperature of the fluid flown through the heat collector tube can be increased up to 550-600°C by virtue of said coatings.
- the coating process cannot be applied to tubes having a thickness larger than 5 mm, but this, in turn, causes the generated steam pressure to stay at a limited level.
- severe mechanical forces do occur, forcing the heat collector tube to deform in direct steam generation systems during the transition phase from water to steam (i.e.
- phase change in heat collector tubes shorter than 700 meters.
- Deformation taking place in the tube causes the tube to contact the outermost vacuum-maintaining permeable glass tube and to break the same.
- the heat collector tube is required to have a length which is at least 700 meters in order to provide complete evaporation of the fluid flown through the heat collector tube. This requirement substantially restricts the areas where a solar energy system may be installed and prevents the installation of the solar energy systems having a capacity which is below a certain limit.
- a heat collector tube is developed according to the present invention, which is suitable for use in a direct steam generation-type solar energy system, and provides the heating of a fluid which is flown through it by the sunrays reflected thereon by means of at least one reflector.
- Said heat collector tube comprises at least one fluid tube absorbing the sunrays sent thereon and at least one interior barrier placed into the fluid tube by leaving gaps between the barriers, wherein a fluid to be heated in the solar energy system is flown through a gap between the interior barrier and the fluid tube.
- annular flow is created without reducing the inner diameter of the fluid tube by which the sunrays are absorbed.
- the fluid flown through the heat collector tube is brought to high temperatures.
- the object of the present invention is to develop a heat collector tube suitable for use in solar thermal energy systems in which direct steam generation is performed.
- Another object of the present invention is to develop a heat collector tube which allows the fluid flown through the heat collector tube to reach high temperature levels.
- a further object of the present invention is to develop a heat collector tube having a shape which is not deformed due to the fluid flown through the heat collector tube.
- Yet a further object of the present invention is to develop a heat collector tube which allows the fluid flown through it to reach liquid/gas equilibrium in shorter distances.
- Still a further object of the present invention is to develop an efficient and reliable heat collector tube.
- Figure 1 is a cross-sectional side view of a heat collector tube according to the present invention.
- Figure 2 is a cross-sectional perspective view of the heat collector tube according to the present invention.
- Figure 3 is a cross-sectional perspective view of an alternative embodiment of a heat collector tube according to the present invention.
- sunrays are sent to a heat collector tube by means of reflectors.
- a fluid flown through the heat collector tube is heated up.
- a double-phase fluid e.g. water and steam
- the fact that the fluid is double-phase causes the heat not to be distributed homogenously within the heat collector tube. This results in deformations in the heat collector tube.
- the inner diameter and/or the length of the heat collector tube should be low and high, respectively.
- the inner diameter of the heat collector tube should be above a certain width (around 50-70 mm) to achieve high efficiency from the sunrays. However, this still results in very long (ca.
- a heat collector tube is developed according to the present invention for use in direct steam generation systems, in which the liquid/gas equilibrium of a fluid flown through the tube is ensured even in shorter distances without resulting in deformation.
- the heat collector tube (T) developed according to the present invention comprises at least one fluid tube (1) absorbing the sunrays sent to the heat collector tube (T), and at least one interior barrier (2) placed into the fluid tube (1) by leaving gaps between the barriers, preferably on the same longitudinal axis with the fluid tube (1), wherein a fluid to be heated in the solar energy system is flown through a gap between the interior barrier (2) and the fluid tube (1).
- sunrays are sent to the fluid flown between the fluid tube (1) and the interior barrier (2) by means of the fluid tube (1).
- annular flow is created based on the fact that the flow rate of the fluid flown through the heat collector tube (T) is increased without decreasing the surface area of the fluid tube (1 ) to which the fluid contacts, and the deformations are prevented which may occur due to temperature differences at the periphery of the outer tube. Therefore, the liquid/gas equilibrium of the fluid is achieved even if the heat collector tube (T) is short.
- the interior barrier (2) is in the form of a tube with closed ends and preferably has a structure of a tube made of a metallic material.
- the interior of the tubular interior barrier (2) will be filled with a gas like air, the internal and external pressures of the interior barrier (2) will be different when the pressure of the fluid flown through the interior barrier (2) and the fluid tube (1) is high. This, in turn, causes the shape of the interior barrier (2) to distort.
- at least one opening (2a) is provided on the interior barrier (2) to provide equilibrium between the internal pressure and the external pressure.
- said interior barrier (2) has a monolithic structure extending along the fluid tube (1). According to an alternative embodiment, at least two interior barriers (2) placed end to end are disposed along the fluid tube (1).
- the heat collector tube (T) comprises at least one retaining member (5) which is preferably disposed between the interior barrier (2) and the fluid tube (1) and prevents the interior barrier (2) from coming close to or moving away from the fluid tube (1) in any direction.
- the interior barrier (2) is prevented from displacing relative to the fluid tube (1) by means of said retaining member (5), so that the fluid is provided with a homogenous flow.
- the heat collector tube (T) comprises at least one outer tube (3) which is disposed out of the fluid tube (1) so as to cover the fluid tube (1) and protect it (1) against external damages.
- said outer tube (3) is preferably made of glass (or from another material having high transmittance against sunrays).
- a vacuum gap (3a) is disposed between the outer tube (3) and the fluid tube (1).
- sunrays are transmitted to the fluid tube (1) without energy loss.
- the outer tube (3) preferably comprises at least one expansion bellows (4) on at least one end thereof by which it is connected to another outer tube (3) and/or to a fixed floor. Thus, when the size of the outer tube (3) changes due to temperature differences, the outer tube (3) is prevented against damages.
- the fluid tube (1) comprises at least one thermal coating to absorbe the sunrays in an improved way.
- the energy amount gained from the sunrays is increased.
- the inner diameter of the fluid tube (1) is 70 mm and the wall thickness thereof is in the range of 2-5 mm.
- the diameter of the interior barrier is selected in the range of 30-50 mm, the liquid/gas equilibrium of the fluid flown through the heat collector tube (T) is achieved even if the length of the heat collector tube (T) is 45 meters.
- the variability of the areas, on which the solar system making use of the heat collector tube (T) according to the present invention may be installed is substantially increased.
- the liquid/gas equilibrium of the fluid flown through the heat collector tube (T) is achieved in a short distance by virtue of the interior barrier (2) used in heat collector tube (T) developed according to the present invention. Additionally, since the inner diameter (i.e. the contact surface with the fluid) of the fluid tube (1 ) by which sunrays are absorbed is not reduced, the fluid flown through the heat collector tube (T) reaches high temperatures.
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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)
- Laminated Bodies (AREA)
Abstract
A heat collector tube according to the present invention is suitable for use in a direct steam generation-type solar energy system, and provides the heating of a fluid which is flown through it by the sunrays reflected thereon by means of at least one reflector. Said heat collector tube (T) comprises at least one fluid tube (1) absorbing the sunrays sent thereon and at least one interior barrier (2) placed into the fluid tube (1) by leaving gaps between the barriers, wherein a fluid to be heated in the solar energy system is flown through a gap between the interior barrier and the fluid tube (1).
Description
DESCRIPTION
A HEAT COLLECTOR TUBE Field of Invention
The present invention relates to heat collector tubes employed in solar thermal energy systems. Prior Art
In solar thermal energy systems, rays from the sun are sent to a heat collector tube by reflector surfaces so that a fluid flown through the heat collector tube is heated up. Solar thermal energy systems are basically divided into two groups according to the type of the fluid flown through the heat collector tube. In the first type of system, a fluid with a high heat retention capacity is flown through the heat collector tube. According to this type, the fluid which is heated up is outlet from the solar thermal energy system and is used to heat water (or a similar fluid) in a source so as to yield steam having a high temperature and pressure. The steam, in turn, is used to run a steam turbine, for instance, to generate electrical energy. In the second type of system, on the other hand, water (or a similar fluid) is flown through the heat collector tube so that directly high temperature and pressure steam is obtained. As is disclosed in the patent document WO2013045721A1 according to the prior art, the approach by which direct hot steam is obtained from the heat collector tube is named as direct steam generation (DSG).
In order to reach high efficiency in a solar thermal energy system, the temperature of the fluid flown through the heat collector tube has to be kept at the highest temperature possible. Therefore, the heat collector tube is coated using special materials in order to absorb the sunrays received from the reflectors in an efficient manner. With the advancing technology, .the temperature of the fluid flown through the heat collector tube can be increased up to 550-600°C by virtue of said coatings. According to that coating technology, however, the coating process cannot be applied to tubes having a thickness larger than 5 mm, but this, in turn, causes the generated steam pressure to stay at a limited level.
In addition, severe mechanical forces do occur, forcing the heat collector tube to deform in direct steam generation systems during the transition phase from water to steam (i.e. phase change) in heat collector tubes shorter than 700 meters. Deformation taking place in the tube causes the tube to contact the outermost vacuum-maintaining permeable glass tube and to break the same. For this reason, the heat collector tube is required to have a length which is at least 700 meters in order to provide complete evaporation of the fluid flown through the heat collector tube. This requirement substantially restricts the areas where a solar energy system may be installed and prevents the installation of the solar energy systems having a capacity which is below a certain limit.
Brief Description of invention
A heat collector tube is developed according to the present invention, which is suitable for use in a direct steam generation-type solar energy system, and provides the heating of a fluid which is flown through it by the sunrays reflected thereon by means of at least one reflector. Said heat collector tube comprises at least one fluid tube absorbing the sunrays sent thereon and at least one interior barrier placed into the fluid tube by leaving gaps between the barriers, wherein a fluid to be heated in the solar energy system is flown through a gap between the interior barrier and the fluid tube.
By virtue of the heat collector tube developed according to the present invention, annular flow is created without reducing the inner diameter of the fluid tube by which the sunrays are absorbed. Thus, the fluid flown through the heat collector tube is brought to high temperatures.
Object of Invention
The object of the present invention is to develop a heat collector tube suitable for use in solar thermal energy systems in which direct steam generation is performed.
Another object of the present invention is to develop a heat collector tube which allows the fluid flown through the heat collector tube to reach high temperature levels.
A further object of the present invention is to develop a heat collector tube having a shape which is not deformed due to the fluid flown through the heat collector tube.
Yet a further object of the present invention is to develop a heat collector tube which allows the fluid flown through it to reach liquid/gas equilibrium in shorter distances.
Still a further object of the present invention is to develop an efficient and reliable heat collector tube.
Description of Figures
Representative embodiments of the heat collector tube developed according to the present invention are illustrated in the accompanying figures briefly described below.
Figure 1 is a cross-sectional side view of a heat collector tube according to the present invention.
Figure 2 is a cross-sectional perspective view of the heat collector tube according to the present invention.
Figure 3 is a cross-sectional perspective view of an alternative embodiment of a heat collector tube according to the present invention.
The parts in the figures are individually designated as following.
Heat collector tube (T)
Fluid tube (1)
Interior barrier (2)
Opening (2a)
Outer tube (3)
Vacuum gap (3a)
Expansion bellows (4)
Retaining member (5)
Description of Invention
In solar energy systems, sunrays are sent to a heat collector tube by means of reflectors. Thus, a fluid flown through the heat collector tube is heated up. In direct steam generation (DSG)-type solar energy systems, a double-phase fluid (e.g. water and steam) is flown through the heat collector tube. The fact that the fluid is double-phase causes the heat not to be distributed homogenously within the heat collector tube. This results in deformations in the heat collector tube. In order to prevent this, the inner diameter and/or the length of the heat collector tube should be low and high, respectively. The inner diameter of the heat collector tube should be above a certain width (around 50-70 mm) to achieve high efficiency from the sunrays. However, this still results in very long (ca. 700 m) heat collector tubes in direct steam generation systems. For this reason, a heat collector tube is developed according to the present invention for use in direct steam generation systems, in which the liquid/gas equilibrium of a fluid flown through the tube is ensured even in shorter distances without resulting in deformation.
As illustratively shown in figures 1-3, the heat collector tube (T) developed according to the present invention comprises at least one fluid tube (1) absorbing the sunrays sent to the heat collector tube (T), and at least one interior barrier (2) placed into the fluid tube (1) by leaving gaps between the barriers, preferably on the same longitudinal axis with the fluid tube (1), wherein a fluid to be heated in the solar energy system is flown through a gap between the interior barrier (2) and the fluid tube (1). In the heat collector tube (T) developed according to the present invention, sunrays are sent to the fluid flown between the fluid tube (1) and the interior barrier (2) by means of the fluid tube (1). Here, annular flow is created based on the fact that the flow rate of the fluid flown through the heat collector tube (T) is increased without decreasing the surface area of the fluid tube (1 ) to which the fluid contacts, and the deformations are prevented which may occur due to temperature differences at the periphery of the outer tube. Therefore, the liquid/gas equilibrium of the fluid is achieved even if the heat collector tube (T) is short.
In a preferred embodiment according to the present invention, the interior barrier (2) is in the form of a tube with closed ends and preferably has a structure of a tube made of a metallic material. According to this embodiment, since the interior of the tubular interior barrier (2) will be filled with a gas like air, the internal and external pressures of the interior barrier (2) will be different when the pressure of the fluid flown through the interior barrier
(2) and the fluid tube (1) is high. This, in turn, causes the shape of the interior barrier (2) to distort. In order to prevent this, at least one opening (2a) is provided on the interior barrier (2) to provide equilibrium between the internal pressure and the external pressure.
According to a representative embodiment of the present invention, said interior barrier (2) has a monolithic structure extending along the fluid tube (1). According to an alternative embodiment, at least two interior barriers (2) placed end to end are disposed along the fluid tube (1).
According to a preferred embodiment of the present invention, the heat collector tube (T) comprises at least one retaining member (5) which is preferably disposed between the interior barrier (2) and the fluid tube (1) and prevents the interior barrier (2) from coming close to or moving away from the fluid tube (1) in any direction. According to this embodiment, the interior barrier (2) is prevented from displacing relative to the fluid tube (1) by means of said retaining member (5), so that the fluid is provided with a homogenous flow.
According to another preferred embodiment of the present invention, the heat collector tube (T) comprises at least one outer tube (3) which is disposed out of the fluid tube (1) so as to cover the fluid tube (1) and protect it (1) against external damages. According to this embodiment, said outer tube (3) is preferably made of glass (or from another material having high transmittance against sunrays). Additionally, a vacuum gap (3a) is disposed between the outer tube (3) and the fluid tube (1). Thus, sunrays are transmitted to the fluid tube (1) without energy loss. The outer tube (3) preferably comprises at least one expansion bellows (4) on at least one end thereof by which it is connected to another outer tube (3) and/or to a fixed floor. Thus, when the size of the outer tube (3) changes due to temperature differences, the outer tube (3) is prevented against damages.
According to a further preferred embodiment of the present invention, the fluid tube (1) comprises at least one thermal coating to absorbe the sunrays in an improved way. Thus, the energy amount gained from the sunrays is increased.
According to a representative embodiment of the present invention, the inner diameter of the fluid tube (1) is 70 mm and the wall thickness thereof is in the range of 2-5 mm.
According to this embodiment, when the diameter of the interior barrier is selected in the range of 30-50 mm, the liquid/gas equilibrium of the fluid flown through the heat collector tube (T) is achieved even if the length of the heat collector tube (T) is 45 meters. When compared to the restriction to 700 meters according to the prior art, the variability of the areas, on which the solar system making use of the heat collector tube (T) according to the present invention may be installed is substantially increased.
The liquid/gas equilibrium of the fluid flown through the heat collector tube (T) is achieved in a short distance by virtue of the interior barrier (2) used in heat collector tube (T) developed according to the present invention. Additionally, since the inner diameter (i.e. the contact surface with the fluid) of the fluid tube (1 ) by which sunrays are absorbed is not reduced, the fluid flown through the heat collector tube (T) reaches high temperatures.
Claims
1. A heat collector tube (T), which is suitable for use in a direct steam generation-type solar energy system, provides the heating of a fluid which is flown through it by sunrays reflected thereon by means of at least one reflector, and comprises at least one fluid tube (1) by which the sunrays sent thereon are absorbed, characterized by comprising
- at least one interior barrier (2) which is placed into the fluid tube (1 ) by leaving gaps between the barriers, wherein the fluid to be heated in the solar energy system is flown through a gap between the interior barrier and the fluid tube (1).
2. The heat collector tube (T) according to claim 1 , characterized in that the interior barrier (2) is disposed on the same longitudinal axis with the fluid tube (1 ).
3. The heat collector tube (T) according to claim 1 , characterized in that the interior barrier (2) is in the form of a tube having closed ends.
4. The heat collector tube (T) according to claim 3, characterized by comprising at least one opening (2a) disposed in the interior barrier (2).
5. The heat collector tube (T) according to claim 1 , characterized in that the interior barrier (2) has a monolithic form extending along the fluid tube (1 ).
6. The heat collector tube (T) according to claim 1 , characterized by comprising at least two interior barriers (2) disposed end to end along the fluid tube (1 ).
7. The heat collector tube (T) according to claim 1 , characterized by comprising at least one retaining member (5), which prevents the interior barrier (2) from coming close to or moving away from the fluid tube (1) in any direction.
8. The heat collector tube (T) according to claim 7, characterized in that the retaining member (5) is situated between the interior barrier (2) and the fluid tube (1 ).
9. The heat collector tube (T) according to claim 1 , characterized by comprising at least one outer tube (3) which is disposed out of the fluid tube (1 ) so as to cover the fluid tube (1) and protects the fluid tube (1) against external damages.
10. The heat collector tube (T) according to claim 9, characterized in that the outer tube (3) is made of a material having high transmittance against sunrays.
11. The heat collector tube (T) according to claim 9 or 10, characterized in that the outer tube is made of glass.
12. The heat collector tube (T) according to claim 9, characterized in that the outer tube (3) has at least one expansion bellows (4) on at least one end thereof by which it is connected to another outer tube (3) and/or to a fixed floor.
13. The heat collector tube (T) according to claim 1 , characterized in that the fluid tube (1 ) comprises at least one thermal coating.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TR2013/13023 | 2013-11-11 | ||
| TR201313023 | 2013-11-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2015069199A1 true WO2015069199A1 (en) | 2015-05-14 |
Family
ID=51211839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/TR2014/000149 WO2015069199A1 (en) | 2013-11-11 | 2014-05-06 | A heat collector tube |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2015069199A1 (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2205378A (en) * | 1938-03-12 | 1940-06-25 | Abbot Charles Greeley | Solar flash boiler |
| DE3934535A1 (en) * | 1989-10-17 | 1991-04-18 | Johannes Dipl Ing Friedlin | Collection of energy from sun - involves parabolic mirror and tubular absorber through which liq. is circulated under pressure |
| US5860414A (en) * | 1996-03-02 | 1999-01-19 | Deutsche Forschungsanstalt Fuer Luft- Und Raumfahrt E.V. | Trough-shaped collector |
| EP2112441A2 (en) * | 2008-04-21 | 2009-10-28 | Joma-Polytec Kunststofftechnik GmbH | Solar absorber and corresponding solar collector |
| CN201434528Y (en) * | 2009-06-26 | 2010-03-31 | 无锡意凯顺得科技有限公司 | Straight-through solar heat exchange heat gathering device |
| WO2011010173A2 (en) * | 2009-07-24 | 2011-01-27 | Dimos Maglaras | Three wall vacuum tube solar collector located in the focus of a non moving semicylindrical parabolic reflector used for production of steam to get electric and thermal energy |
| DE102009046064A1 (en) * | 2009-10-27 | 2011-04-28 | Schott Solar Ag | Absorber tube and method for reversibly loading and unloading a getter material |
| CN101042266B (en) * | 2006-02-22 | 2011-06-08 | 淄博绿能环保设备科技有限公司 | Pressure-bearing direct connection solar vacuum energy converting pipe with medium light-heat conversion transmission glass composite pipe |
-
2014
- 2014-05-06 WO PCT/TR2014/000149 patent/WO2015069199A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2205378A (en) * | 1938-03-12 | 1940-06-25 | Abbot Charles Greeley | Solar flash boiler |
| DE3934535A1 (en) * | 1989-10-17 | 1991-04-18 | Johannes Dipl Ing Friedlin | Collection of energy from sun - involves parabolic mirror and tubular absorber through which liq. is circulated under pressure |
| US5860414A (en) * | 1996-03-02 | 1999-01-19 | Deutsche Forschungsanstalt Fuer Luft- Und Raumfahrt E.V. | Trough-shaped collector |
| CN101042266B (en) * | 2006-02-22 | 2011-06-08 | 淄博绿能环保设备科技有限公司 | Pressure-bearing direct connection solar vacuum energy converting pipe with medium light-heat conversion transmission glass composite pipe |
| EP2112441A2 (en) * | 2008-04-21 | 2009-10-28 | Joma-Polytec Kunststofftechnik GmbH | Solar absorber and corresponding solar collector |
| CN201434528Y (en) * | 2009-06-26 | 2010-03-31 | 无锡意凯顺得科技有限公司 | Straight-through solar heat exchange heat gathering device |
| WO2011010173A2 (en) * | 2009-07-24 | 2011-01-27 | Dimos Maglaras | Three wall vacuum tube solar collector located in the focus of a non moving semicylindrical parabolic reflector used for production of steam to get electric and thermal energy |
| DE102009046064A1 (en) * | 2009-10-27 | 2011-04-28 | Schott Solar Ag | Absorber tube and method for reversibly loading and unloading a getter material |
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