WO2000020806A1 - Strahlungskollektor - Google Patents
Strahlungskollektor Download PDFInfo
- Publication number
- WO2000020806A1 WO2000020806A1 PCT/DE1999/002459 DE9902459W WO0020806A1 WO 2000020806 A1 WO2000020806 A1 WO 2000020806A1 DE 9902459 W DE9902459 W DE 9902459W WO 0020806 A1 WO0020806 A1 WO 0020806A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- radiation
- absorber
- radiation collector
- mirror surface
- light
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
-
- 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
-
- 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
- F24S2023/832—Other shapes curved
-
- 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
- F24S2023/88—Multi reflective traps
-
- 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
Definitions
- the invention relates to a radiation collector with a mirror surface which has a substantially concave shape, a radiation absorber and an opening.
- Radiation collectors with a mirror surface and a radiation absorber are known in various designs.
- a parabolic mirror usually concentrates parallel incident light rays on a point-shaped or line-shaped absorber element. As a result, the light rays incident on a certain surface are bundled in order to generate the highest possible radiation density at the absorber.
- Liquid media usually flow in the absorber, which are heated by the radiation energy and give off the heat again at another point.
- Radiation collectors have also been proposed for photovoltaic cells, but are less widespread in practice since a lower energy density is sufficient for photovoltaic cells.
- the invention is therefore based on the object of developing a radiation collector with mirror surface and radiation absorber mentioned at the outset in such a way that the highest possible proportion of the radiation impinging on the radiation collector is absorbed by the radiation absorber.
- This object is achieved in that, seen in cross section, the maximum distance between two points of the mirror surface is greater than the width of the opening.
- Known radiation collectors are either parabolic or trough-shaped, the collectors having the largest possible light incidence opening.
- the large opening is used to allow as much radiation as possible to hit the radiation collector, which is centered by the reflection on the radiation collector or directly impinges on a radiation absorber.
- the present invention is based on the knowledge that the radiation reflected by the radiation absorber can also be returned to the absorber by a suitable mirror system.
- the mirror system is designed as a concave shape such that it encloses an angle of more than 180 ° in cross section. The maximum possible size of the light entry opening is thus reduced in order to guide radiation penetrating into the mirror system, if necessary by repeated reflection on the radiation absorber.
- the reflected radiation component can be repeatedly returned to the radiation absorber by the mirror system.
- the mirror system is designed so that the beam path strikes the solar module at least twice before it leaves the radiation collector. This is achieved in that the longest cross section of the concave shape of the mirror surface is larger than the opening width provided in the mirror surface. At least a part of the light entering the radiation collector is thus reflected several times in order to hit the radiation absorber sooner or later.
- the relatively small light entry gap opens up new areas of application in which only a relatively small light area is available, but on the other hand an effective yield of the incident light is required. Such areas of application can be found, for example, in facade construction, where only limited areas are available as light entry areas.
- a further opening can also be provided in the mirror system, which is arranged in such a way that only special, directed radiation emerges from the mirror system.
- the radiation collector can thus be used both for radiation concentration and for directed radiation emission, for example into the interior of a building.
- the radiation collector is installed so that it has a light incidence opening facing the light in the installed state and a light exit opening facing away from the light in the installed state.
- the concave mirror surface can have a plurality of surface parts which are arranged at an preferably obtuse angle to one another in order to delimit the shape.
- the mirror surface is preferably curved in order to facilitate the manufacture of the collector.
- a spherical surface can also be used as a mirror surface, for example.
- the concave mirror surface is preferably arranged around an axis, since this leads to an effective design. Experiments have shown that particularly good results are achieved if the angle ⁇ between the edges of the opening and the center of gravity is less than 150 °. On the one hand, this enables good reflection on the collector surface and, on the other hand, a sufficient opening for the incidence of radiation.
- the angle advantageously has more than 10 °.
- the collector encloses a cylinder in cross section by an angle of more than 180 °, preferably more than 210 ° and less than 350 °.
- an advantageous embodiment provides that the absorber is arranged in the area of the mirror surface.
- part of the mirror surface is designed as an absorber, which thus takes part of the radiation from the system and converts it, while the rest of the radiation is reflected at the absorber.
- the radiation collector according to the invention even allows the absorber to be arranged parallel to the direction of light entry.
- the described design of the mirror surface allows the absorber to be arranged anywhere within the concave shape.
- an absorber tube can be arranged at any point within the mirror system.
- the aforementioned statements show that the radiation collector according to the invention can be used for different types of absorbers.
- Preferred fields of application are absorbers which have at least one photovoltaic cell and absorbers with solar modules for converting radiation energy into thermal energy.
- FIG. 1 shows a radiation collector with a polygonal mirror surface
- Figure 2 shows a radiation collector with a circular segment-shaped mirror surface and absorber in the area of the mirror surface and
- Figure 3 shows a radiation collector with a circular segment-shaped mirror surface, central absorber and two light openings.
- the radiation collector 1 shown in FIG. 1 has a mirror surface 2 which consists of five mirrors 3, 4, 5, 6 and 7 arranged at an angle to one another. These mirrors 3 to 7 are arranged with respect to one another in such a way that they delimit a concave shape with a radiation absorber 8.
- a light entry opening 9 is provided between the radiation absorber 8 and the mirror surface 7, through which a light beam 10 enters the space delimited by the mirror surfaces and the absorber.
- the light entry opening has a width (a) which is smaller than the maximum distance (A) between two points of the mirror surface 2.
- the angle between the edges of the opening 9 and the center of gravity S is approximately 30 °.
- the light beam 10 is reflected in the concave space by the mirror surfaces 3 to 7 until it reaches the absorber 8. At point 11 on the absorber surface, part of the radiation energy is absorbed and the rest is reflected. The reflected radiation component is in turn guided back to the absorber 8 via the mirror surfaces 6, 3 and 5 in order to strike the absorber again at point 12. Here too, part of the incident radiation energy is absorbed and the rest is reflected. The residual beam continues to be reflected on the mirror surfaces and on the absorber until it escapes again from the radiation collector 1 through the light entry opening 9.
- the light beam thus strikes the absorber surface 8 repeatedly and only a small residual radiation component leaves the radiation collector. Effective radiation absorption can thus be achieved even with strong reflection at the absorber 8.
- the arrangement of the mirror surfaces with respect to one another that is to say their number and angular positions as well as the width of the light entry opening 9 and the The position of the absorber 8 can be individually adapted to the given requirements and can be mathematically optimized.
- FIG. 2 shows an alternative embodiment of a radiation collector 20.
- This radiation collector has a circular cross section. Radiation energy enters through a light entry opening 21 into a concave cavity which is formed by a mirror surface 22 and an absorber 23.
- the light beam is reflected on the mirror surfaces 22 in order to be directed to the absorber 23, and light beams reflected by the absorber 23 are also very likely to be returned to the absorber 23.
- the bend of the reflector surfaces, the arrangement of the absorber and the size and position of the light entry opening 21 are to be individually tailored to a specific area of application. Reflective internals within the concave collector shape can increase the effectiveness of the radiation collector.
- FIG. 3 An embodiment of a radiation collector 30 with two light openings 31 and 32 is shown in FIG. 3.
- the collector 30 is arranged between two wall pieces 33 and 34 and the light entry opening is on the outside 35, while the light exit opening 32 opens towards the inside 36.
- An absorber 37 is arranged in the center of the radiation collector 30.
- Radiation entering the radiation collector 30 through the light entry opening 31 is either absorbed at the absorber 37 or reaches the absorber Mirror surfaces 38 or 39 on which the light beam is reflected.
- the light beam impinging on the absorber 37 is partially absorbed and the remaining part is reflected, so that it is very likely to strike the mirror surfaces 38 and 39 and be further reflected by these surfaces.
- the radiation travels around in the radiation collector 30 until it leaves the collector through the light entry opening 31 or the light exit opening 32.
- the structure of the absorber and radiation surfaces should, if possible, be designed in such a way that little radiation leaves the radiation collector 30 through the light inlet opening and at least minimal illumination of the interior is made possible by the light outlet opening 32.
- a further reflector or absorber surface can also be arranged at the location of the light exit opening 32.
- a solar module is provided as the absorber surface, which converts the steel energy into thermal energy.
- the absorber can also be designed as a photovoltaic cell, which is known to have a high degree of reflection radiation.
Landscapes
- 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
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19982012T DE19982012D2 (de) | 1998-10-02 | 1999-08-06 | Strahlungskollektor |
AU64621/99A AU6462199A (en) | 1998-10-02 | 1999-08-06 | Radiation collector |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19845414 | 1998-10-02 | ||
DE19845414.7 | 1998-10-02 | ||
DE19905264A DE19905264A1 (de) | 1998-10-02 | 1999-02-09 | Strahlungskollektor |
DE19905264.6 | 1999-02-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000020806A1 true WO2000020806A1 (de) | 2000-04-13 |
Family
ID=26049248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1999/002459 WO2000020806A1 (de) | 1998-10-02 | 1999-08-06 | Strahlungskollektor |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU6462199A (de) |
DE (1) | DE19982012D2 (de) |
WO (1) | WO2000020806A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITAN20110068A1 (it) * | 2011-06-03 | 2012-12-04 | Giacomo Galli | Collettore solare perfezionato. |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE501294C (de) * | 1930-07-26 | Josef Petri Dr | Vorrichtung zur UEbertragung des Sonnenlichtes bzw. der Sonnenwaerme | |
FR1455892A (fr) * | 1965-05-17 | 1966-05-20 | Centre Nat Rech Scient | Perfectionnements apportés aux installations pour la captation de l'énergie transmise par rayonnement |
US3899672A (en) * | 1974-02-19 | 1975-08-12 | Univ Chicago | Solar energy collection |
FR2478802A1 (fr) * | 1980-03-24 | 1981-09-25 | Litt Charles | Structure de base de capteur solaire et acoustique avec differentes variantes pour absorbeurs et reflecteurs |
DE3526858A1 (de) * | 1985-07-26 | 1987-02-05 | Hartmut Lohmeyer | Solarheizung fuer gebaeude |
-
1999
- 1999-08-06 WO PCT/DE1999/002459 patent/WO2000020806A1/de active Application Filing
- 1999-08-06 DE DE19982012T patent/DE19982012D2/de not_active Expired - Lifetime
- 1999-08-06 AU AU64621/99A patent/AU6462199A/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE501294C (de) * | 1930-07-26 | Josef Petri Dr | Vorrichtung zur UEbertragung des Sonnenlichtes bzw. der Sonnenwaerme | |
FR1455892A (fr) * | 1965-05-17 | 1966-05-20 | Centre Nat Rech Scient | Perfectionnements apportés aux installations pour la captation de l'énergie transmise par rayonnement |
US3899672A (en) * | 1974-02-19 | 1975-08-12 | Univ Chicago | Solar energy collection |
FR2478802A1 (fr) * | 1980-03-24 | 1981-09-25 | Litt Charles | Structure de base de capteur solaire et acoustique avec differentes variantes pour absorbeurs et reflecteurs |
DE3526858A1 (de) * | 1985-07-26 | 1987-02-05 | Hartmut Lohmeyer | Solarheizung fuer gebaeude |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITAN20110068A1 (it) * | 2011-06-03 | 2012-12-04 | Giacomo Galli | Collettore solare perfezionato. |
Also Published As
Publication number | Publication date |
---|---|
AU6462199A (en) | 2000-04-26 |
DE19982012D2 (de) | 2001-09-27 |
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