Receiver tube with receiver tubular jacket and parabolic trough collector containing same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F24J-002/08
F24J-002/06
F24J-002/12
출원번호
US-0770211
(2004-02-02)
등록번호
US-7395820
(2008-07-08)
우선권정보
DE-103 05 428(2003-02-03)
발명자
/ 주소
Kuckelkorn,Thomas
출원인 / 주소
Schott AG
대리인 / 주소
Striker,Michael J.
인용정보
피인용 횟수 :
9인용 특허 :
5
초록▼
The parabolic trough collector includes a single-axis parabolic mirror (1) and a receiver tube (2) arranged at the focal point (F) of the parabolic mirror (1). The receiver tube (2) includes an absorber tube (4) and an outer tubular glass jacket (3) around it. To compensate for focusing errors in th
The parabolic trough collector includes a single-axis parabolic mirror (1) and a receiver tube (2) arranged at the focal point (F) of the parabolic mirror (1). The receiver tube (2) includes an absorber tube (4) and an outer tubular glass jacket (3) around it. To compensate for focusing errors in the parabolic collector and thus to reduce associated geometric optical losses, the tubular jacket (3) is provided with structural elements (9a, 9b, 9c, 9d), which focus sunlight reflected from the mirror as well as sunlight that falls directly on the receiver tube from the sun on the absorber tube. The receiver tube is preferably arranged relative to the parabolic mirror, so that its center is displaced from the focal point (F) by a distance equal to half the spacing between the tubular jacket (3) and the absorber tube (4).
대표청구항▼
I claim: 1. A tubular jacket (3) for a parabolic trough collector, said parabolic trough collector comprising a parabolic mirror (1) having a focal point (F) and a normal axis (N) and a receiver tube (2) arranged at said focal point to receive solar radiation reflected from the parabolic mirror (1)
I claim: 1. A tubular jacket (3) for a parabolic trough collector, said parabolic trough collector comprising a parabolic mirror (1) having a focal point (F) and a normal axis (N) and a receiver tube (2) arranged at said focal point to receive solar radiation reflected from the parabolic mirror (1), said parabolic mirror (1) being arranged outside of said receiver tube (2) and said receiver tube (2) comprising the tubular jacket (3) and an absorber tube (4), said absorber tube being arranged inside the tubular jacket, wherein said tubular jacket (3) comprises a glass tube and structural elements (9a, 9b, 9c, 9d), said structural elements (9a, 9b, 9c, 9d) extend around said tubular jacket at least over respective angular ranges of 20�� to 65�� on opposite sides of said normal axis (N); whereby said structural elements focus sunlight that falls directly on the receiver tube (2) from the sun but which would otherwise be deflected away from the absorber tube without the presence of said structural elements as well as sunlight that is reflected from the parabolic mirror but which would otherwise not reach said absorber tube without the presence of said structural elements on said absorber tube (4). 2. The tubular jacket as defined in claim 1, wherein said structural elements comprise a plurality of lenses (9a). 3. The tubular jacket as defined in claim 1, wherein said structural elements comprise a plurality of polyhedral segments (9b, 9c). 4. The tubular jacket as defined in claim 1, wherein said structural elements comprise a plurality of prisms (9b, 9c). 5. The tubular jacket as defined in claim 1, further comprising a structured foil mounted on an inner or outer side of the tubular jacket and wherein said foil includes said structural elements. 6. The tubular jacket as defined in claim 1, wherein said structural elements do not change in a longitudinal direction along the tubular jacket. 7. The tubular jacket as defined in claim 1, further comprising an antireflective coating (11,17) on at least one of an inside surface and an outside surface of the tubular jacket. 8. The tubular jacket as defined in claim 1, wherein said structural elements are lens-shaped and are provided by a wavy structuring of an inner and/or outer wall of the glass tube. 9. The tubular jacket as defined in claim 1, wherein said structural elements are prism-shaped and are provided by a zig-zag structuring of an inner and/or outer wall of the glass tube. 10. The tubular jacket as defined in claim 1, wherein said angular ranges are from 35�� to 65�� from said normal axis of the parabolic mirror and on said opposite sides of said normal axis. 11. A receiver tube (2) for a parabolic trough collector, said parabolic trough collector comprising a parabolic mirror (1) having a focal point (F) and a normal axis (N), which is arranged outside of said receiver tube so as to direct reflected light from the parabolic mirror on said receiver tube; wherein said receiver tube is arranged at said focal point (F) of said parabolic mirror and comprises an absorber tube (4) and a tubular jacket (3) arranged around the absorber tube (4); wherein said tubular jacket (3) comprises a glass tube and structural elements (9a, 9b, 9c, 9d); wherein said structural elements (9a, 9b, 9c, 9d) comprise a plurality of lenses, prisms and/or polyhedral elements and said structural elements (9a, 9b, 9c, 9d) extend around said tubular jacket at least over respective angular ranges of 20�� to 65�� on opposite sides of said normal axis (N); whereby said structural elements focus sunlight that falls directly from the sun on the receiver tube (2) but which would otherwise be deflected away from the absorber tube without the presence of said structural elements and focus sunlight that is reflected from the parabolic mirror (1) but which would otherwise not reach said absorber tube without the presence of said structural elements on said absorber tube arranged in the tubular jacket. 12. The receiver tube as defined in claim 11, wherein said tubular jacket comprises a foil (19) mounted on an inner or an outer side of the tubular jacket and wherein said foil includes said structural elements. 13. The receiver tube as defined in claim 11, wherein said tubular jacket comprises an antireflective coating (11,17) arranged on an outside surface and/or an inside surface of the tubular jacket. 14. The receiver tube as defined in claim 11, wherein said structural elements are lens-shaped and are provided by a wavy structuring of an inner and/or outer wall of the glass tube. 15. The receiver tube as defined in claim 11, wherein said structural elements are prism-shaped and are provided by a zig-zag structuring of an inner and/or outer wall of the glass tube. 16. The receiver tube as defined in claim 11, wherein said angular ranges are from 35�� to 65�� from said normal axis of the parabolic mirror and on said opposite sides of said normal axis. 17. A parabolic trough collector for solar energy, said parabolic trough collector comprising a parabolic mirror (1) having a focal point (F) and a normal axis (N); and a receiver tube (2) arranged at said focal point (F), said parabolic mirror (1) being arranged outside of said receiver tube (2) so that said normal axis (N) passes through said receiver tube (2); in which said receiver tube (2) comprises a tubular jacket (3) and an absorber tube (4) arranged in the tubular jacket (3), said tubular jacket comprises a glass tube and structural elements (9a, 9b, 9c, 9d) that defract and/or deflect light, said structural elements comprising a plurality of lenses, prisms and/or polyhedral elements; and in which said structural elements (9a, 9b, 9c, 9d) extend around said tubular jacket at least over respective angular ranges of 20�� to 65�� on opposite sides of said normal axis (N); whereby said structural elements (9a, 9b, 9c, 9d) are arranged around said tubular jacket so as to focus solar radiation that falls on the receiver tube directly from the sun but which would otherwise be deflected away from the absorber tube without the presence of said structural elements on the absorber tube and so as to focus solar radiation that is reflected from the parabolic mirror (1) but which would otherwise not reach said absorber tube without the presence of said structural elements on said absorber tube arranged in the tubular jacket. 18. The parabolic trough collector as defined in claim 17, wherein said corresponding angular ranges extend around said tubular jacket from 35�� to 65�� with respect to said normal axis and on said opposite sides of said normal axis. 19. The parabolic trough collector as defined in claim 17, wherein said structural elements are lens-shaped and are provided by a wavy structuring of an inner and/or outer wall of the glass tube. 20. The parabolic trough collector as defined in claim 17, wherein said structural elements are prism-shaped and are provided by a zig-zag structuring of an inner and/or outer wall of the glass tube. 21. The parabolic trough collector as defined in claim 17, wherein said receiver tube (2) is positioned in relation to said parabolic mirror (1), so that a center of said receiver tube (2) is displaced in a direction toward said parabolic mirror (1) from said focal point (F) by a distance equal to about half of a spacing (d) between said tubular jacket (3) and said absorber tube (4). 22. The parabolic trough collector as defined in claim 17, wherein said structural elements do not change in a longitudinal direction along the receiver tube (2). 23. The parabolic trough collector as defined in claim 17, further comprising a structured foil mounted on an outer side of the tubular jacket, and wherein said foil includes said structural elements.
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이 특허에 인용된 특허 (5)
Daume Jochen,DEX ; Bauer Heinrich,DEX ; Grimm Arnold,DEX, Device for obtaining energy from sunlight with at least one solar collector.
Aran, Hagai; Barkai, Menashe; Cohen, Gabriel; Ezer, Rami; Lipman, Eli, Heat receiver tube, method for manufacturing the heat receiver tube, parabolic trough collector with the receiver tube and use of the parabolic trough collector.
Mills, David R.; Schramek, Philipp; Degraaff, David B.; Johnson, Peter L.; Hoermann, Alexander; Johnson, Lars R., Linear Fresnel solar arrays and drives therefor.
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