CN103196242A - Glass-cover-free tubular solar thermal collector - Google Patents
Glass-cover-free tubular solar thermal collector Download PDFInfo
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- CN103196242A CN103196242A CN201310101934XA CN201310101934A CN103196242A CN 103196242 A CN103196242 A CN 103196242A CN 201310101934X A CN201310101934X A CN 201310101934XA CN 201310101934 A CN201310101934 A CN 201310101934A CN 103196242 A CN103196242 A CN 103196242A
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- optical cavity
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- 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
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Abstract
A glass-cover-free tubular solar thermal collector relates to a solar thermal collector, and a problem that a glass cover of the solar thermal collector cracks due to the fact that thermal expansion degrees of a metal material and the glass cover of a tubular thermal absorber are different is solved. A light enclosing cavity is made of a metal material, a heat preservation layer is wrapped on an outer wall of the light enclosing cavity, and the tubular thermal absorber is arranged in the light enclosing cavity and made of the metal material. A light-transmitting port is arranged on the top portion of the light enclosing cavity, an optical window is arranged at the light-transmitting port, and two ends of the light enclosing cavity are connected with the tubular thermal absorber in mechanical mode through metal sealing connecting joints with a function of reducing thermal strain respectively. The axial thermal expansion difference of the light enclosing cavity and the tubular thermal absorber is offset through wave pitch changes of a corrugated metal connecting sealing joint, and the problem that the glass cover is prone to crack, and the glass cover, the tubular thermal absorber and the metal connecting sealing joint of the traditional tubular thermal absorber are hard to weld is solved.
Description
Technical field
The present invention relates to a kind of solar thermal collector, be specifically related to a kind of tube type solar collector that need not cloche, belong to the solar concentrating system technical field.
Background technology
Solar thermal utilization is one of effective way of regenerative resource development.The solar energy thermal-power-generating technology mainly contains three kinds of forms in the world at present: slot type, tower and dish formula.Wherein the tower and hot generation technology of disc type solar energy still is in test and demonstration phase, and the trough type solar power generation technology has been ripe commercialization technology.After the sunshine that slot-type optical collector utilizes parabolical geometrical optical characteristic will hang down radiant heat flux density converges, form height and converge hot-fluid.The tubular type heat dump that is placed in slot-type optical collector focal plane place absorbs high hot-fluid and the mode by coupled and heat-exchanges such as heat conduction, convection current of converging and height is converged hot-fluid is converted to heat energy.
Because the influence of rule sexual factors such as solar energy is subjected to round the clock on the one hand, season and geographic latitude, be subjected to the restriction of enchancement factors such as sunny, dark clouds and sleety weather on the other hand again, thereby the heat utilization of solar energy has significant discontinuity and inhomogeneities, and the tubular type heat dump bears high thermal stress easily.After the variations in temperature, because the tubular type heat dump is different with thermal coefficient of expansion and the thermal expansion degree of glass shroud, and the accident that causes cloche to break easily.
Summary of the invention
The objective of the invention is for the cloche that solves single-stage or multistage groove type solar condenser system heat collector owing to the different problems that cause the glass shroud to break with cloche thermal expansion degree of the metal material of tubular type heat dump, and then provide a kind of tube type solar collector that need not cloche.
Technical scheme of the present invention is: a kind of tube type solar collector that need not cloche comprises heat-insulation layer, tubular type heat dump, contains the optical window of wide band gap semiconducter selective permeation coating, circle optical cavity and two have the thermal strain of the reduction function metal joint that is tightly connected; Described circle optical cavity be shaped as cast, the circle optical cavity is made by metal material, be coated with heat-insulation layer on the outer wall of circle optical cavity, scribble reflectance coating on the inwall of circle optical cavity, described tubular type heat dump is arranged in the circle optical cavity, and tubular type heat dump and the coaxial setting of circle optical cavity, the tubular type heat dump is made by metal material, the outer surface of tubular type heat dump scribbles absorber coatings, the inside of tubular type heat dump is heat-transfer working medium, the top of circle optical cavity has the printing opacity mouth, and printing opacity mouth place is equipped with the optical window that contains wide band gap semiconducter selective permeation coating, and the two ends of circle optical cavity respectively have by one and reduce the thermal strain function metal joint that is tightly connected and set up mechanical connection with the tubular type heat dump.
Preferred version: have reduce thermal strain function metal be tightly connected joint by top connection, subtract the strain corrugated portion and lower contact is formed, the coaxial setting of top connection and lower contact, subtracting the strain corrugated portion is connected between top connection and the lower contact, top connection and the outer surface welding of enclosing optical cavity, the outer surface welding of lower contact and tubular type heat dump.
Preferred version: the bellows-shaped that subtracts the strain corrugated portion is zigzag, semicircle shape or rectangular-shaped.
Preferred version: circle optical cavity, tubular type heat dump, contain the optical window of wide band gap semiconducter selective permeation coating and two and have the thermal strain of reduction function metal and be tightly connected and form chamber between the joint, chamber vacuumizes.So arrange, reduce the tubular type heat dump to the radiation loss of circle optical cavity.
Preferred version: the circle optical cavity is made by stainless steel or aluminium alloy.So arrange, circle optical cavity quality is light and rigidity intensity is big, has more effectively solved the frangible shortcoming of cloche.
Preferred version: the printing opacity mouth be shaped as cylinder open, tapered opening or composite parabolic opening.
Preferred version: heat-insulation layer is the silica wool heat-insulation layer.So arrange, effectively reduce radiation loss.
Preferred version: the width of printing opacity mouth is 3%～5% of circle optical cavity diameter.So arrange, to reach the purpose that reduces the reflection loss of circle optical cavity.
Preferred version: the wide band gap semiconducter that contains the optical window of wide band gap semiconducter selective permeation coating is tin ash semiconductor, three indium oxide semiconductors or stannic acid cadmium semiconductor.
Preferred version: the tubular type heat dump is made by stainless steel, copper or aluminium alloy.
Preferred version: the internal heat transfer working medium of tubular type heat dump is conduction oil or steam.
Preferred version: reflectance coating is vacuum aluminum-coated or polishing evaporated film silver coating, and absorber coatings is black nickel plating or electroplating black chromium coating.
The present invention compared with prior art has following effect: the tubular type heat dump is installed in the center of circle optical cavity.During work, the sunshine that heat flow density is hanged down in incident by single-stage or multistage trench light condensing system converges.Height converges light and converges the outer surface that the back enters into the inside of circle optical cavity by the optical window that encloses optical cavity and gets to the tubular type heat dump.The tubular type heat dump that contains the high-absorbility coating absorbs most of incident sunshine and the mode by heat conduction, convection current passes to heat-transfer working medium with energy.The small part sunshine that is absorbed by the tubular type heat dump does not reflex to the circle optical cavity.Because the circle optical cavity has that printing opacity is young, housing surface reflectivity advantages of higher, the incident sunshine overwhelming majority that is absorbed by the tubular type heat dump is not repeatedly reflexed to the heat dump surface and is absorbed by heat dump through once reaching by the circle optical cavity.The circle optical cavity reduces the thermal strain function metal joint that is tightly connected and sets up mechanical connection with the tubular type heat dump by having, and the tubular type heat dump is maked somebody a mere figurehead the center at the circle optical cavity.Circle optical cavity inside vacuumizes to reduce the tubular type heat dump to the radiation loss of circle optical cavity.Profile with the metal connection sealing section that reduces the thermal strain function is corrugated, and the circle optical cavity is offset by the pitch of waves variation that the corrugated metal is connected sealing section with tubular type heat dump thermal dilation difference vertically.Because circle optical cavity, tubular type heat dump all adopt the metal manufacturing to form, solved that the glass shroud easily breaks and glass shroud, the tubular type heat dump of conventional tubular heat dump are connected sealing section and weld difficult problem with metal.Contain wide band gap semiconducter selective permeation coating and in the solar radiation wave band, have high transmission low reflectivity when, and have low transmittance and high reflectance at the infra-red radiation wave band.Therefore, the optical window that contains wide band gap semiconducter selective permeation coating is when keeping transparent cap rock to the solar radiation permeability, and the heat radiation that absorber is sent reflects back in the heat dump cavity and reduces heat dump to environmental radiation heat exchange loss and reduce heat convection loss between circle optical cavity and environment.
Description of drawings
Fig. 1 is a kind of cross sectional representation that need not the tube type solar collector of cloche;
Fig. 2 is a kind of vertical section schematic diagram that need not the tube type solar collector of cloche;
Fig. 3 is the vertical section schematic diagram of circle optical cavity;
Fig. 4 has to reduce the front view that thermal strain function metal is tightly connected and saves;
Fig. 5 has to reduce the left view that thermal strain function metal is tightly connected and saves;
Fig. 6 has that to reduce the be tightly connected strain corrugated portion that subtracts of joint of thermal strain function metal be jagged schematic diagram;
Fig. 7 has to reduce the schematic diagram that the strain corrugated portion is semicircle shape that subtracts that thermal strain function metal is tightly connected and saves;
Fig. 8 has that to reduce the be tightly connected strain corrugated portion that subtracts of joint of thermal strain function metal be rectangular-shaped schematic diagram;
Accompanying drawing indicates among the figure: 1, heat-insulation layer; 2, tubular type heat dump; 3, the optical window that contains wide band gap semiconducter selective permeation coating; 4, printing opacity mouth; 5, circle optical cavity; 6, chamber; 7, have and reduce the thermal strain function metal joint that is tightly connected; 7-1, top connection, 7-2, subtract the strain corrugated portion; 7-3, lower contact.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing and example:
To shown in Figure 8, a kind of tube type solar collector that need not cloche of present embodiment comprises heat-insulation layer 1, tubular type heat dump 2, contains the optical window 3 of wide band gap semiconducter selective permeation coating, circle optical cavity 5 and two have the thermal strain of the reduction function metal joint 7 that is tightly connected as Fig. 1; Described circle optical cavity 5 be shaped as cast, circle optical cavity 5 is made by metal material, be coated with heat-insulation layer 1 on the outer wall of circle optical cavity 5, scribble reflectance coating on the inwall of circle optical cavity 5, described tubular type heat dump 2 is arranged in the circle optical cavity 5, and tubular type heat dump 2 and the 5 coaxial settings of circle optical cavity, tubular type heat dump 2 is made by metal material, the outer surface of tubular type heat dump 2 scribbles absorber coatings, the inside of tubular type heat dump 2 is heat-transfer working medium, the top of circle optical cavity 5 has printing opacity mouth 4, printing opacity mouth 4 places are equipped with the optical window 3 that contains wide band gap semiconducter selective permeation coating, and the two ends of circle optical cavity 5 respectively have by one and reduce the thermal strain function metal joint 7 that is tightly connected and set up mechanical connection with tubular type heat dump 2.
Further specify: have reduce thermal strain function metal be tightly connected joint 7 by top connection 7-1, subtract strain corrugated portion 7-2 and lower contact 7-3 forms, top connection 7-1 and the coaxial setting of lower contact 7-3, subtracting strain corrugated portion 7-2 is connected between top connection 7-1 and the lower contact 7-3, top connection 7-1 welds with the outer surface of circle optical cavity 5, the outer surface welding of lower contact 7-3 and tubular type heat dump 2.
Further specify: the bellows-shaped that subtracts strain corrugated portion 7-2 is zigzag, semicircle shape or rectangular-shaped.
Further specify: circle optical cavity 5, tubular type heat dump 2, contain the optical window 3 of wide band gap semiconducter selective permeation coating and two and have the thermal strain of reduction function metal and be tightly connected and form chamber 6 between the joint 7, chamber 6 vacuumizes.So arrange, reduce the tubular type heat dump to the radiation loss of circle optical cavity.
Further specify: circle optical cavity 5 is made by stainless steel or aluminium alloy.So arrange, circle optical cavity 5 quality are light and rigidity intensity is big, more effectively solved the frangible shortcoming of cloche.
Further specify: printing opacity mouth 4 be shaped as cylinder open, tapered opening or composite parabolic opening.
Further specify: heat-insulation layer 1 is the silica wool heat-insulation layer.So arrange, effectively reduce radiation loss.
Further specify: the width of printing opacity mouth 4 is 3%～5% of circle optical cavity 5 diameters.So arrange, to reach the purpose that reduces the reflection loss of circle optical cavity.
Further specify: the wide band gap semiconducter that contains the optical window 3 of wide band gap semiconducter selective permeation coating is tin ash semiconductor, three indium oxide semiconductors or stannic acid cadmium semiconductor.
Further specify: tubular type heat dump 2 is made by stainless steel, copper or aluminium alloy.
Further specify: the internal heat transfer working medium of tubular type heat dump 2 is conduction oil or steam.
Further specify: reflectance coating is vacuum aluminum-coated or polishing evaporated film silver coating, and absorber coatings is black nickel plating or electroplating black chromium coating.
Claims (10)
1. tube type solar collector that need not cloche is characterized in that: a kind of tube type solar collector that need not cloche comprises heat-insulation layer (1), tubular type heat dump (2), contains the optical window (3) of wide band gap semiconducter selective permeation coating, circle optical cavity (5) and two have the reduction thermal strain function metal joint (7) that is tightly connected; Described circle optical cavity (5) be shaped as cast, circle optical cavity (5) is made by metal material, be coated with heat-insulation layer (1) on the outer wall of circle optical cavity (5), scribble reflectance coating on the inwall of circle optical cavity (5), described tubular type heat dump (2) is arranged in the circle optical cavity (5), and tubular type heat dump (2) and the coaxial setting of circle optical cavity (5), tubular type heat dump (2) is made by metal material, the outer surface of tubular type heat dump (2) scribbles absorber coatings, the inside of tubular type heat dump (2) is heat-transfer working medium, the top of circle optical cavity (5) has printing opacity mouth (4), printing opacity mouth (4) locates to be equipped with the optical window (3) that contains wide band gap semiconducter selective permeation coating, and the two ends of circle optical cavity (5) respectively have by one and reduce be tightly connected joint (7) and tubular type heat dump (2) of thermal strain function metal and set up mechanical connection.
2. a kind of tube type solar collector that need not cloche according to claim 1, it is characterized in that: have reduce thermal strain function metal be tightly connected joint (7) by top connection (7-1), subtract strain corrugated portion (7-2) and lower contact (7-3) is formed, top connection (7-1) and the coaxial setting of lower contact (7-3), subtracting strain corrugated portion (7-2) is connected between top connection (7-1) and the lower contact (7-3), top connection (7-1) and the outer surface welding of enclosing optical cavity (5), the outer surface welding of lower contact (7-3) and tubular type heat dump (2).
3. a kind of tube type solar collector that need not cloche according to claim 2, it is characterized in that: the bellows-shaped that subtracts strain corrugated portion (7-2) is zigzag, semicircle shape or rectangular-shaped.
4. according to claim 1,2 or 3 described a kind of tube type solar collectors that need not cloche, it is characterized in that: circle optical cavity (5), tubular type heat dump (2), contain the optical window (3) of wide band gap semiconducter selective permeation coating and two and have the thermal strain of reduction function metal and be tightly connected and form chamber (6) between the joint (7), chamber (6) vacuumizes.
5. a kind of tube type solar collector that need not cloche according to claim 4, it is characterized in that: circle optical cavity (5) is made by stainless steel or aluminium alloy, tubular type heat dump (2) is made by stainless steel, copper or aluminium alloy, and heat-insulation layer (1) is the silica wool heat-insulation layer.
6. a kind of tube type solar collector that need not cloche according to claim 4 is characterized in that: printing opacity mouth (4) be shaped as cylinder open, tapered opening or composite parabolic opening.
7. a kind of tube type solar collector that need not cloche according to claim 6 is characterized in that: the width of printing opacity mouth (4) is 3%～5% of circle optical cavity (5) diameter.
8. a kind of tube type solar collector that need not cloche according to claim 4, it is characterized in that: the wide band gap semiconducter that contains the optical window (3) of wide band gap semiconducter selective permeation coating is tin ash semiconductor, three indium oxide semiconductors or stannic acid cadmium semiconductor.
9. a kind of tube type solar collector that need not cloche according to claim 8, it is characterized in that: the internal heat transfer working medium of tubular type heat dump (2) is conduction oil or steam.
10. a kind of tube type solar collector that need not cloche according to claim 9 is characterized in that: reflectance coating is vacuum aluminum-coated or polishing evaporated film silver coating, and absorber coatings is black nickel plating or electroplating black chromium coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310101934.XA CN103196242B (en) | 2013-03-27 | 2013-03-27 | Glass-cover-free tubular solar thermal collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310101934.XA CN103196242B (en) | 2013-03-27 | 2013-03-27 | Glass-cover-free tubular solar thermal collector |
Publications (2)
| Publication Number | Publication Date |
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| CN103196242A true CN103196242A (en) | 2013-07-10 |
| CN103196242B CN103196242B (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310101934.XA Expired - Fee Related CN103196242B (en) | 2013-03-27 | 2013-03-27 | Glass-cover-free tubular solar thermal collector |
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| CN (1) | CN103196242B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466263A (en) * | 2014-09-03 | 2016-04-06 | 奇鋐科技股份有限公司 | Uniform temperature board structure |
| CN106839456A (en) * | 2017-04-01 | 2017-06-13 | 内蒙古工业大学 | Compound many curved surface groove type solar concentrating collectors with automatic defrosting system |
| CN112639375A (en) * | 2018-04-30 | 2021-04-09 | 约翰内斯堡威特沃特斯兰德大学 | Reducing thermal radiation loss from parabolic trough receivers by applying specular and hot mirror coatings |
| CN115523666A (en) * | 2022-10-17 | 2022-12-27 | 中国农业科学院农田灌溉研究所 | Air heat collecting system |
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| US4084576A (en) * | 1976-05-03 | 1978-04-18 | Owens-Illinois, Inc. | Bulb-type solar energy collector |
| EP0133989A2 (en) * | 1983-08-03 | 1985-03-13 | Heinz Dr. Kunert | Structural element, in particular a slab-like wall element |
| WO1994006046A1 (en) * | 1992-09-04 | 1994-03-17 | The Australian National University | Optical reflector arrays and apparatus using such arrays |
| CN1563852A (en) * | 2004-04-13 | 2005-01-12 | 赵宝善 | Glass-metal vacuum solar heat collecting tubes used as building member |
| CN101796352A (en) * | 2007-03-30 | 2010-08-04 | 海力欧维斯公司 | inflatable solar collector |
| CN203100226U (en) * | 2013-03-27 | 2013-07-31 | 中国石油大学(华东) | Tube-type solar thermal collector without glass shield |
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2013
- 2013-03-27 CN CN201310101934.XA patent/CN103196242B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4084576A (en) * | 1976-05-03 | 1978-04-18 | Owens-Illinois, Inc. | Bulb-type solar energy collector |
| EP0133989A2 (en) * | 1983-08-03 | 1985-03-13 | Heinz Dr. Kunert | Structural element, in particular a slab-like wall element |
| WO1994006046A1 (en) * | 1992-09-04 | 1994-03-17 | The Australian National University | Optical reflector arrays and apparatus using such arrays |
| CN1563852A (en) * | 2004-04-13 | 2005-01-12 | 赵宝善 | Glass-metal vacuum solar heat collecting tubes used as building member |
| CN101796352A (en) * | 2007-03-30 | 2010-08-04 | 海力欧维斯公司 | inflatable solar collector |
| CN203100226U (en) * | 2013-03-27 | 2013-07-31 | 中国石油大学(华东) | Tube-type solar thermal collector without glass shield |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466263A (en) * | 2014-09-03 | 2016-04-06 | 奇鋐科技股份有限公司 | Uniform temperature board structure |
| CN105466263B (en) * | 2014-09-03 | 2019-08-02 | 奇鋐科技股份有限公司 | Equalizing plate structure |
| CN106839456A (en) * | 2017-04-01 | 2017-06-13 | 内蒙古工业大学 | Compound many curved surface groove type solar concentrating collectors with automatic defrosting system |
| CN112639375A (en) * | 2018-04-30 | 2021-04-09 | 约翰内斯堡威特沃特斯兰德大学 | Reducing thermal radiation loss from parabolic trough receivers by applying specular and hot mirror coatings |
| US20210190382A1 (en) * | 2018-04-30 | 2021-06-24 | University Of The Witwatersrand, Johannesburg | Thermal radiation loss reduction in a parabolic trough receiver by the application of a cavity mirror and a hot mirror coating |
| US11788772B2 (en) * | 2018-04-30 | 2023-10-17 | University Of The Witwatersrand, Johannesburg | Thermal radiation loss reduction in a parabolic trough receiver by the application of a cavity mirror and a hot mirror coating |
| CN115523666A (en) * | 2022-10-17 | 2022-12-27 | 中国农业科学院农田灌溉研究所 | Air heat collecting system |
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| CN103196242B (en) | 2014-12-10 |
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