CN105157257A - Slot type light gathering type solar vacuum heat collecting pipe - Google Patents
Slot type light gathering type solar vacuum heat collecting pipe Download PDFInfo
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- CN105157257A CN105157257A CN201510622783.1A CN201510622783A CN105157257A CN 105157257 A CN105157257 A CN 105157257A CN 201510622783 A CN201510622783 A CN 201510622783A CN 105157257 A CN105157257 A CN 105157257A
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- pipe
- heat
- insulation board
- collecting pipe
- vacuum heat
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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
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Abstract
The invention relates to a slot type light gathering type solar vacuum heat collecting pipe. The slot type light gathering type solar vacuum heat collecting pipe comprises an outer glass cover pipe and an inner heat absorbing pipe. An inner pipe coating is arranged on the outer cylindrical face of the inner heat absorbing pipe. A cavity between the outer glass cover pipe and the inner heat absorbing pipe is vacuum annular space. A heat shielding plate is arranged in the vacuum annular space. The side face, corresponding to the inner heat absorbing pipe, of the heat shielding plate is a reflection face, and the side face, corresponding to the outer glass cover plate, of the heat shielding plate is an absorption face. The inner surface of the heat shielding plate has the properties of high reflectivity and low emissivity in an infrared band, the outer surface of the heat shielding plate is coated with a selective absorption coating and has the properties of high absorptivity in the solar radiation wave band of 0.2-3 microns and low emissivity in the infrared wave band larger than 3 microns. The external radiation heat loss of the inner pipe of the vacuum heat collecting pipe under the medium-high temperature heat collecting situation can be greatly reduced, and the heat collecting efficiency is improved.
Description
Technical field
The invention belongs to solar energy heat utilization technical field, relate to solar collection element, be specifically related to a kind of slot light collection type solar vacuum heat-collecting pipe.
Background technology
Because solar vacuum heat-collecting pipe has the advantages that structure is simple, function admirable, production technology are advanced reliably, be particularly suitable for large-scale production in enormous quantities; it is very extensive in actual applications, is particularly widely used in solar parabolic through power generation system.
Be vacuum layer between solar vacuum heat-collecting pipe inner and outer tubes, within the heat of pipe do not exist and scattered and disappeared by cross-ventilation.But can be conducted heat by radiation between interior pipe and outer tube, thus cause thermal loss.Because solar vacuum heat-collecting pipe outer wall of inner tube face scribbles solar selectively absorbing coating, interior pipe emissivity when temperature is lower is about 5%, and therefore, pipe can lose to the radiations heat energy major part of outer tube.And the full-glass solar energy vacuum tube be applied on slot light collection type collecting system, in it, pipe can reach 400 DEG C even middle high temperature of more than 400 DEG C, and therefore, the heat flow density of the outside radiant heat transfer of pipe can sharply increase.Interior pipe emissivity simultaneously under high temperature can reach 10%, causes the outside dispersed heat of interior pipe can be larger.So external heat loss problem becomes very meaningful under solving the interior higher situation of pipe temperature.
Summary of the invention
In order to cut down the thermal losses of the larger external radiation heat transfer of slot light collection type solar energy vacuum tube, effectively improve the collecting efficiency of solar energy vacuum tube, the present invention proposes a kind of slot light collection type solar vacuum heat-collecting pipe.
A kind of slot light collection type solar vacuum heat-collecting pipe, comprise outer glass enclosure tube 2 and interior endothermic tube 3, the external cylindrical surface of interior endothermic tube 3 is provided with interior pipe coating 31; Cavity between outer glass enclosure tube 2 and interior endothermic tube 3 is vacuum annular space 4; Improvement is:
In described vacuum annular space 4, be provided with insulation board 5, a side corresponding with interior endothermic tube 3 on insulation board 5 is reflecting surface, and a side corresponding with outer glass enclosure tube 2 is absorbing surface; Described reflecting surface is provided with the reflecting layer with high reflectance, low-launch-rate characteristic, and described absorbing surface is provided with the coating for selective absorption at solar radiation wave band high-absorbility, low-launch-rate.
The cross section of described insulation board 5 is arc-shaped, and the radial spacing between insulation board 5 and interior endothermic tube 3 is 1/3 ~ 1/2 of the radial diameter of vacuum annular space 4.
The central angle of the interior endothermic tube 3 that insulation board 5 covers is 120 ° ~ 150 °.
Described insulation board 5 material is aluminium alloy.
Described reflector material is reflectance coating or face, polishing metal.
Described absorbed layer is solar selectively absorbing coating, and it is more than 90% in the absorptivity of the solar radiation wave band of 0.2 ~ 3 μm.
Described reflective film material is aluminium film or silverskin, and face, described polishing metal is polished aluminum alloy surface.
The material of described solar selectively absorbing coating is metal oxide ceramic plated film band or black chrome coating.
Advantageous Effects of the present invention embodies in the following areas:
1., by setting up the insulation board of arc, because described insulation board inner surface has high reflectance characteristic, the inner pipe portion external radiations heat energy major part that insulation board can be covered reflects back on interior pipe, decreases the loss of heat.
2. by arranging the absorbed layer of solar energy selective absorbing material at insulation board outer surface, solar irradiation direct projection is on described insulation board absorbed layer, insulation board temperature will raise, Radiant exothermicity then between the inner pipe portion that covers of described insulation board and insulation board will significantly reduce, thus indirectly decreases the external heat waste of interior pipe.
3. set up insulation board, although sheltered from the beam radia light that in part, pipe can receive, decrease the caloric receptivity of interior pipe, but by described 1,2 two points, the thermal loss that insulation board reduces is greater than the beam radia heat that inner pipe portion that described insulation board covers can obtain.Numerical analysis proves, the thermal loss that insulation board reduces is 1.25 ~ 1.5 times of the beam radia heat that inner pipe portion that described insulation board covers can obtain, and namely described a kind of groove type solar vacuum tube heat collection function efficiency improves obviously.
4. insulation board described in is arranged in the vacuum annular space between the interior pipe of described solar energy vacuum tube, outer tube, have spatter property, persistence, structure simple, be easy to the advantages such as manufacture.
In sum, a kind of groove type solar thermal-collecting tube of the present invention can reduce the external radiant heat loss of interior pipe, efficiently solves the problem that in solar energy vacuum tube, under high-temperature condition, radiation loss is large, has good value for applications.
Accompanying drawing explanation
Fig. 1 is slot light collection type solar energy vacuum heat collecting entire system schematic diagram.
Fig. 2 is perpendicular to vacuum heat collection pipe axis a-a place cross sectional representation in Fig. 1.
Fig. 3 is the fundamental diagram of slot light collection type solar vacuum heat-collecting pipe.
Sequence number in upper figure: slot-type optical collector 1, outer glass enclosure tube 2, interior endothermic tube 3, interior pipe coating 31, vacuum annular space 4, insulation board 5, reflecting layer 51, absorbed layer 52.
Detailed description of the invention
Below in conjunction with accompanying drawing, by embodiment, the present invention is further described.
See Fig. 2, a kind of slot light collection type solar vacuum heat-collecting pipe comprises outer glass enclosure tube 2 and interior endothermic tube 3, and the external cylindrical surface of interior endothermic tube 3 is provided with interior pipe coating 31; Cavity between outer glass enclosure tube 2 and interior endothermic tube 3 is vacuum annular space 4.
In vacuum annular space 4, be provided with insulation board 5, the material of insulation board 5 is aluminium alloy, and cross section is arc-shaped.A side corresponding with interior endothermic tube 3 on insulation board 5 is reflecting surface, and a side corresponding with outer glass enclosure tube 2 is absorbing surface; Reflecting surface is provided with the reflecting layer with high reflectance, low-launch-rate characteristic, and reflector material is reflectance coating, and reflective film material is aluminium film; Absorbing surface is provided with the coating for selective absorption at solar radiation wave band high-absorbility, low-launch-rate, coating for selective absorption is more than 90% in the absorptivity of the solar radiation wave band of 0.2 ~ 3 μm, and the material of coating for selective absorption is metal oxide ceramic plated film band.Radial spacing between insulation board 5 and interior endothermic tube 3 is 1/3 of the radial diameter of vacuum annular space 4.The hot spot of concentrator that interior endothermic tube 3 receives reflection and the central angle that formed is α, the central angle that insulation board 5 covers interior endothermic tube 3 is then not more than 360-α.
See Fig. 1, in slot light collection type solar energy vacuum heat collecting system, along with sun elevation angle in a day constantly changes, this trench light condensing system needs to follow the tracks of the sun to reach maximum Heat-collecting effect, because slot-type optical collector 1 and solar vacuum heat-collecting pipe are integrated tracking mode, namely slot-type optical collector 1 and solar vacuum heat-collecting pipe are fixed together to rotate and follow the tracks of the sun, now insulation board 5 will always just to sun direct projection irradiation, and can ensure the sunray propagation path not blocking slot-type optical collector 1 reflection.View factor in wherein being blocked by insulation board 5 between endothermic tube part and reflecting layer 51 is close to 1, and this just makes the radiations heat energy of this interior endothermic tube part substantially all project on the reflecting layer 51 of insulation board 5.Reflecting layer 51 has high reflectance, the inner pipe portion blocked can be reflected back on interior endothermic tube 3 at the heat major part be radiated on reflecting layer 51, stop the external heat loss through radiation of this interior endothermic tube part by insulation board 5.After the absorbed layer 52 of insulation board 5 absorbs beam radia, the bulk temperature of insulation board 5 will obviously raise, this make to be blocked by insulation board 5 in radiant heat transfer amount between endothermic tube part and insulation board 5 significantly reduce, indirectly decrease radiation heat loss.
See Fig. 3, it is 120 ° that the present embodiment arranges the central angle that insulation board 5 covers interior endothermic tube 3, and insulation board 5 is 1/3 of the radial diameter of vacuum annular space with the radial spacing of interior endothermic tube 3.Endothermic tube 3 diameter 63mm in the present embodiment, outer glass enclosure tube 2 diameter 102mm, insulation board 5 and interior endothermic tube 3 radial spacing are 6.5mm.Because both radial spacings are very little, view factor between the capped surface of interior endothermic tube and insulation board 5 can be set
=1.Interior endothermic tube medium fuse salt temperature is 700K, and environment temperature is 300K, and solar irradiation intensity is 1000
.Because interior endothermic tube 3 temperature is higher, interior endothermic tube 3 external surface coating emissivity is 0.1 in the case of a high temperature, the absorptivity of absorbed layer 52 solar selective absorbing coating is 0.95, reflecting layer 51 reflectivity is that 0.96. can calculate according to above-mentioned condition: do not having in insulation board situation, in 120 °, the surperficial heat waste of endothermic tube 3 is 144.2W/m, being 113.8W/m arranging in insulation board 5 situation endothermic tube 3 total surface heat waste in 120 °, reducing thermal loss 21%.Visible insulation board of setting up can reduce thermal loss effectively.
To sum up, although after being provided with insulation board 5, insulation board 5 can shelter from the sun direct projection irradiation that in a part, tube-surface instinct receives, and the thermal loss that insulation board 5 reduces is greater than the beam radia heat that tube-surface in this part can obtain.Numerical analysis proves, the thermal loss that insulation board 5 reduces is 1.25 ~ 1.5 times of the beam radia heat that in the part that is blocked, tube-surface can obtain, and namely the collecting efficiency of described a kind of groove type solar vacuum heat collection pipe improves obviously.Simultaneously insulation board 5 is arranged in the vacuum annular space 4 between the interior endothermic tube 3 of described solar energy vacuum tube, outer glass enclosure tube 2, have spatter property, persistence, structure simple, be easy to the advantages such as manufacture.
Described insulation board 5 presents arc-shaped and near interior pipe 3 but do not contact with interior pipe 3, can adopt several round metal cuff on inner pipe and the technology such as welding make insulation board 5 be supported in annular space 4, described metal circular boop should be carefully narrow, namely metal circular boop and interior pipe contact surface as far as possible little, simultaneously 3 mu m waveband emissivity are little, 0.2-3 μm solar radiation wave band absorptivity is high being greater than for described metal circular boop, can select to be coated with solar energy Selective absorber coating on metal circular boop surface.
Claims (8)
1. a slot light collection type solar vacuum heat-collecting pipe, comprises outer glass enclosure tube (2) and interior endothermic tube (3), and the external cylindrical surface of interior endothermic tube (3) is provided with interior pipe coating (31); Cavity between outer glass enclosure tube (2) and interior endothermic tube (3) is vacuum annular space (4), it is characterized in that:
In described vacuum annular space (4), be provided with insulation board (5), the upper side corresponding with interior endothermic tube (3) of insulation board (5) is reflecting surface, and a side corresponding with outer glass enclosure tube (2) is absorbing surface; Described reflecting surface is provided with the reflecting layer with high reflectance, low-launch-rate characteristic, and described absorbing surface is provided with the coating for selective absorption at solar radiation wave band high-absorbility, low-launch-rate.
2. a kind of slot light collection type solar vacuum heat-collecting pipe according to claim 1, it is characterized in that: the cross section of described insulation board (5) is arc-shaped, the radial spacing between insulation board (5) and interior endothermic tube (3) is 1/3 ~ 1/2 of the radial diameter of vacuum annular space (4).
3. a kind of slot light collection type solar vacuum heat-collecting pipe according to claim 1, is characterized in that: the central angle of the interior endothermic tube (3) that insulation board (5) covers is 120 ° ~ 150 °.
4. a kind of slot light collection type solar vacuum heat-collecting pipe according to claim 1, is characterized in that: described insulation board (5) material is aluminium alloy.
5. a kind of slot light collection type solar vacuum heat-collecting pipe according to claim 1, is characterized in that: described reflector material is reflectance coating or face, polishing metal.
6. a kind of slot light collection type solar vacuum heat-collecting pipe according to claim 1, is characterized in that: described absorbed layer is solar selectively absorbing coating, and it is more than 90% in the absorptivity of the solar radiation wave band of 0.2 ~ 3 μm.
7. a kind of slot light collection type solar vacuum heat-collecting pipe according to claim 5, it is characterized in that: described reflective film material is aluminium film or silverskin, face, described polishing metal is polished aluminum alloy surface.
8. a kind of slot light collection type solar vacuum heat-collecting pipe according to claim 6, is characterized in that: the material of described solar selectively absorbing coating is metal oxide ceramic plated film band or black chrome coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510622783.1A CN105157257A (en) | 2015-09-28 | 2015-09-28 | Slot type light gathering type solar vacuum heat collecting pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510622783.1A CN105157257A (en) | 2015-09-28 | 2015-09-28 | Slot type light gathering type solar vacuum heat collecting pipe |
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| CN105157257A true CN105157257A (en) | 2015-12-16 |
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| CN201510622783.1A Pending CN105157257A (en) | 2015-09-28 | 2015-09-28 | Slot type light gathering type solar vacuum heat collecting pipe |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105928216A (en) * | 2016-04-11 | 2016-09-07 | 北京金阳科创太阳能技术有限公司 | Point focusing solar vacuum receiver |
| CN106766258A (en) * | 2016-12-06 | 2017-05-31 | 中国科学技术大学 | A kind of high-temperature vacuum heat-collecting tube with transparent insulation board |
| CN108362010A (en) * | 2018-05-15 | 2018-08-03 | 中国科学院电工研究所 | A kind of groove type solar thermal-collecting tube for high temperature |
| CN108870770A (en) * | 2018-07-20 | 2018-11-23 | 北京兆阳能源技术有限公司 | A kind of production method of reception device and glass baseplate |
| CN109297203A (en) * | 2018-11-14 | 2019-02-01 | 中国科学技术大学 | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system |
| CN110513892A (en) * | 2019-08-29 | 2019-11-29 | 东南大学 | Semi-circular thermal-collecting tube and big opening high concentration ratio slot light collection collecting system with fin |
| CN112212523A (en) * | 2019-07-09 | 2021-01-12 | 内蒙古工业大学 | One-dimensional heat transfer mathematical model of heat pipe type vacuum tube light-gathering heat-collecting system and application thereof |
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| US5365920A (en) * | 1989-03-01 | 1994-11-22 | Bomin Solar Gmbh & Co. Kg | Solar concentrator system |
| WO2000075576A1 (en) * | 1999-06-09 | 2000-12-14 | Solar Enterprises International, Llc | Non-imaging optical illumination system |
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| CN205037606U (en) * | 2015-09-28 | 2016-02-17 | 中国科学技术大学 | Slot type spotlight type solar vacuum heat collection tube |
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2015
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Patent Citations (7)
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| US5365920A (en) * | 1989-03-01 | 1994-11-22 | Bomin Solar Gmbh & Co. Kg | Solar concentrator system |
| WO2000075576A1 (en) * | 1999-06-09 | 2000-12-14 | Solar Enterprises International, Llc | Non-imaging optical illumination system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105928216A (en) * | 2016-04-11 | 2016-09-07 | 北京金阳科创太阳能技术有限公司 | Point focusing solar vacuum receiver |
| CN106766258A (en) * | 2016-12-06 | 2017-05-31 | 中国科学技术大学 | A kind of high-temperature vacuum heat-collecting tube with transparent insulation board |
| CN106766258B (en) * | 2016-12-06 | 2019-02-12 | 中国科学技术大学 | A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band |
| CN108362010A (en) * | 2018-05-15 | 2018-08-03 | 中国科学院电工研究所 | A kind of groove type solar thermal-collecting tube for high temperature |
| CN108870770A (en) * | 2018-07-20 | 2018-11-23 | 北京兆阳能源技术有限公司 | A kind of production method of reception device and glass baseplate |
| CN109297203A (en) * | 2018-11-14 | 2019-02-01 | 中国科学技术大学 | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system |
| CN112212523A (en) * | 2019-07-09 | 2021-01-12 | 内蒙古工业大学 | One-dimensional heat transfer mathematical model of heat pipe type vacuum tube light-gathering heat-collecting system and application thereof |
| CN112212523B (en) * | 2019-07-09 | 2022-12-09 | 内蒙古工业大学 | One-dimensional heat transfer mathematical model of heat pipe type vacuum tube light-gathering heat-collecting system and application thereof |
| CN110513892A (en) * | 2019-08-29 | 2019-11-29 | 东南大学 | Semi-circular thermal-collecting tube and big opening high concentration ratio slot light collection collecting system with fin |
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Application publication date: 20151216 |
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