CN109357416B - Solar heat collecting tube with holes on heat absorber - Google Patents
Solar heat collecting tube with holes on heat absorber Download PDFInfo
- Publication number
- CN109357416B CN109357416B CN201811160664.9A CN201811160664A CN109357416B CN 109357416 B CN109357416 B CN 109357416B CN 201811160664 A CN201811160664 A CN 201811160664A CN 109357416 B CN109357416 B CN 109357416B
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- Prior art keywords
- heat
- heat absorber
- absorber
- holes
- tube
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 125
- 239000011521 glass Substances 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 238000010521 absorption reaction Methods 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 3
- 230000005855 radiation Effects 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims 2
- 239000012267 brine Substances 0.000 claims 1
- 230000000452 restraining effect Effects 0.000 claims 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims 1
- 230000008646 thermal stress Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 239000011229 interlayer Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a solar heat collecting tube with holes on a heat absorber, which comprises the heat absorber, wherein the heat absorber is arranged in a glass sleeve, one end of the heat absorber is a metal tube with a plug closed and the other end opened, a plurality of holes are arranged on the heat absorber, the outer surface, the inner surface and the hole wall of the heat absorber are coated with selective absorption coatings, a heat exchange medium flows in from one side and flows out from the holes, a sealing device is positioned at a heat exchange medium inlet and is arranged between the heat absorber and the glass sleeve, and the outer side of the glass sleeve is coated with a selective transmission coating. The invention can effectively promote the improvement of the convection heat exchange coefficient of the heat absorber and the heat exchange medium, and simultaneously reduce the thermal stress of the heat absorber.
Description
Technical Field
The invention relates to the field of solar heat collection, in particular to a solar heat collection tube with holes on a heat absorber.
Background
With the development of socioeconomic performance, the environmental stress caused by the use of fossil energy is becoming serious. In order to alleviate the shortage of fossil energy and the environmental problems caused by the combustion of fossil energy, the development and utilization of renewable energy are becoming more and more widespread. The solar energy resource is inexhaustible, and is the renewable energy which is most popular with people at present.
The effective utilization degree of solar energy depends on the heat collection mode of the solar energy, the material and structure of the heat absorber and other factors. In order to improve the heat collection capacity and the heat exchange capacity of the heat absorber, the heat absorber is generally made of metal materials with better heat conductivity, and the outer surfaces of the heat absorber are generally coated with selective absorption coatings.
Solar heat absorbers currently have several problems: 1. the heat absorber has uneven thermal stress distribution. Due to the nature of sunlight, only a portion of the surface of the absorber receives solar radiation, which directly results in non-uniformity of heating at different locations of the surface of the absorber, thereby increasing thermal stress of the absorber and reducing the service life of the absorber. 2. The heat exchange efficiency between the heat absorber and the heat exchange medium is not high. Because of the flow field characteristics in the heat absorber and the inherent characteristics of the heat exchange medium, most of the prior heat exchange mediums directly wash the heat absorber, and the heat transfer coefficient is not high. Although there are some improvements, such as: the addition of ribs or turbulators, but also increases the resistance, the overall effect improvement is not significant.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a solar heat collecting tube with holes on a heat absorber, which solves the problems of uneven thermal stress distribution of the heat absorber and low heat exchange efficiency between the heat absorber and a heat exchange medium in the prior art.
The technical scheme of the invention is as follows: the solar heat collecting tube comprises a heat absorber, wherein the heat absorber is arranged in a glass sleeve, one end of the heat absorber is a metal tube with one end being closed by a plug and the other end being opened, a plurality of holes are arranged on the heat absorber, the outer surface, the inner surface and the hole wall of the heat absorber are coated with selective absorption coatings, a heat exchange medium flows in from one side and flows out from the holes, a sealing device is positioned at a heat exchange medium inlet and is arranged between the heat absorber and the glass sleeve, and the outer side of the glass sleeve is coated with selective transmission coatings.
When the heat collecting pipe is a flat plate type or vacuum pipe type heat collector, the position of the opening is at the upper half part of the heat absorber; when the vacuum tube type solar heat collector is used, a layer of glass tube is sleeved outside the heat collecting tube, and vacuum is pumped between the outer layer glass tube and the inner layer glass tube.
When the heat collecting pipe is a focusing type heat collector, the opening is positioned at the lower half part of the heat absorber.
The shape of the heat absorber opening is round, oval, triangular, rectangular or diamond.
The heat absorber is provided with a plurality of holes, and the number of the holes is single-row holes, double-row holes or multiple-row holes.
The spacing between holes on the heat absorber is equal or unequal.
Each aperture in the absorber is of equal or unequal size.
The sealing device is a sealing ring, a sealing strip or a sealing gasket.
The heat exchange medium is a light-permeable heat exchange medium. The heat exchange medium is water, saline solution or alcohol solution.
The beneficial effects of the invention are as follows:
(1) The heat absorber is provided with a plurality of holes, and a heat exchange medium flows in from one end of the heat absorber and flows out from each hole of the heat absorber. The heat exchange medium can exchange heat with the inner surface of the heat absorber, can exchange heat with the heat absorber through each hole of the heat absorber, and can exchange heat with the outer surface of the heat absorber again after flowing to the outer surface of the heat absorber. According to the scheme, the heat exchange coefficient and the heat exchange area of the heat exchange medium and the heat absorber are increased, and the heat exchange efficiency of the heat exchange medium and the heat absorber is improved.
(2) The inner surface and the outer surface of the heat absorber and the inner sides of the holes are coated with selective absorption coatings, so that sunlight can be projected onto the outer surface of the heat absorber and can also be projected onto the inner surface of the heat absorber through the holes on the heat absorber. The heat absorption area of the heat absorber can not be reduced, the inner surface of the heat absorber can absorb the heat of sunlight passing through the opening, the uniformity of the temperature distribution of the heat absorber along the radial direction can be effectively improved, the thermal stress of the heat absorber can be reduced, and the service life of the heat absorber is prolonged.
(3) When the openings of the heat absorber along the length direction of the tube are uneven in size, the short circuit and backflow of fluid can be effectively prevented.
(4) The invention can open holes in the places with more solar radiation, enhance the convection heat exchange at the places, and further improve the problem of uneven thermal stress distribution.
(5) The device can be applied to not only flat-plate solar collectors and vacuum tube solar collectors, but also focusing type solar collectors such as groove type solar collectors.
(6) The operation process of opening the holes on the heat absorber is simple, the cost is low, and the large-batch processing and manufacturing are convenient.
The heat absorber has the advantages of large heat collection area, high heat exchange efficiency, long service life, wide application range, simple manufacturing and processing and the like.
Drawings
FIG. 1 is a schematic view of a heat collecting device employing an open-pore heat absorber according to the present invention;
FIG. 2 is a schematic view of a portion of a heat sink structure employing different aperture forms; (a) uniformly sized single row of openings, (b) non-uniformly sized single row of openings, (c) uniformly sized multiple row of openings;
FIG. 3 is a schematic view of the structure of the present invention as applied to a trough type solar collector;
fig. 4 is a schematic structural view of the present invention applied to a vacuum tube type solar collector.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1, the outer surface, the inner surface and the wall of each hole of the heat absorber 1 are coated with a selective absorption coating 6, and the selective absorption coating 6 can effectively absorb sunlight projected onto the heat absorber 1. Sunlight can irradiate the outer surface of the heat absorber, can penetrate through all the openings to irradiate the inner surface of the heat absorber, and can irradiate the hole wall, so that the heat absorption area of the heat absorber is increased. One end of the heat absorber is opened, and the other end is closed by a plug 7. One end of an interlayer between the glass sleeve 2 and the heat absorber is opened, and the other end of the interlayer adopts a sealing device 3, which can be a sealing ring or a sealing rubber cushion for sealing, so that the backflow and leakage of the heat exchange medium 5 can be effectively prevented. The heat exchange medium 5 enters the heat absorber 1 from the opened end of the heat absorber and exchanges heat with the inner wall of the heat absorber 1, flows out from the openings, exchanges heat again between the wall of the hole and the outer surface of the heat absorber 1, exchanges heat in the interlayer between the glass sleeve 2 and the outer wall of the heat absorber, and finally flows out from the opened end of the glass sleeve 2. The convective heat transfer coefficient and the uniformity of the temperature distribution throughout the absorber 1 are improved. The outside of the glass sleeve 2 is coated with the selective transmission coating 4, the selective transmission coating 4 can effectively transmit solar rays, the emissivity is lower, and the heat loss of the heat collecting tube is further reduced.
The openings of the heat absorber 1 may be uniformly sized openings (fig. 2 a) or unevenly sized openings (fig. 2 b), and the openings of the heat absorber 1 may be circular, triangular, rectangular, diamond-shaped, etc. The holes may be equally spaced or unequally spaced. The number of rows of openings may be single (fig. 2 a) or multiple (fig. 2 c). When the holes with uneven sizes are adopted, the flow rates of the heat exchange medium 5 flowing out of the holes are basically equal, so that the short circuit phenomenon of the heat exchange medium 5 in the flowing process can be avoided, and the heat exchange medium 5 is prevented from flowing out of the first holes only. And simultaneously, the heat exchange medium 5 and the heat absorber can be ensured to perform sufficient heat exchange.
The heat collecting pipe may be applied to a trough type solar collector (fig. 3). The heat exchange medium 5 adopts high-temperature resistant non-vaporization transparent liquid, and the position of the opening of the heat absorber is selected on the lower semi-circumferential surface of the heat absorber for receiving the light of the condenser 8. The heat collection temperature of the trough type solar heat collector is high, and the temperature distribution of the traditional heat absorber along the circumferential direction is very uneven. The inner wall of the upper semicircular surface of the heat absorber can receive solar rays through the holes in the lower semicircular surface of the heat absorber, so that the uniformity of temperature distribution of the heat absorber and the heat collection efficiency of the solar heat collector are improved, and the service life of the heat absorber is prolonged.
The heat collecting pipe may be applied to a vacuum tube type solar collector (fig. 4). When the glass tube is applied to the vacuum tube type solar collector, a layer of glass tube 9 needs to be sleeved outside the heat collecting tube, and the hole opening position of the heat absorber is arranged on the upper semicircular surface of the heat absorber for receiving solar radiation. The outer glass tube 9 and the inner glass tube 2 are vacuumized, the heat exchange medium 5 performs primary heat exchange in the heat absorber, and after flowing out from the orifice, the heat exchange medium performs flow heat exchange in the interlayer of the inner glass tube 2 and the outer wall of the heat absorber. The vacuum interlayer between the outer glass tube 9 and the inner glass tube 2 can effectively prevent heat dissipation and improve the heat absorption capacity of the heat exchange medium 5.
The heat collecting pipe can be applied to a flat plate type solar heat collector. The outer side of the flat-plate solar collector is required to be covered with a transparent glass cover plate, and the heat collecting tube is arranged below the transparent glass cover plate. The transparent glass cover plate can play roles in transmitting light and reducing heat loss. The heat exchange medium 5 adopts transparent solution, and the open pore position of the heat absorber is on the upper half circumference surface of the heat absorber when solar rays are incident, so that the sunlight can be effectively ensured to be projected onto the inner wall of the heat absorber after passing through the holes and the heat exchange medium 5, the uniformity of the temperature distribution of the heat absorber is improved, and the heat exchange efficiency of the heat exchange medium 5 is increased.
The foregoing description of the preferred embodiments of the present invention is merely illustrative, and all modifications and variations made in the present invention or used directly or indirectly in other related technical fields should be considered as falling within the scope of the present invention.
Claims (9)
1. The solar heat collecting tube with holes on the heat absorber is characterized in that a heat absorber with one end closed and the surface with holes is inserted into each glass sleeve, and the heat collecting tube comprises the heat absorber (1), the glass sleeve (2), a plug (7) of the heat absorber and a sealing device (3) between the heat absorber and the glass sleeve; the heat absorber (1) is a metal pipe with one end closed by a plug (7) and the other end opened, and is arranged in the glass sleeve (2); the outer surface and the inner surface of the heat absorber (1) and the wall surface of the hole are coated with a selective absorption coating (6) for absorbing solar rays; the outer surface of the glass sleeve (2) is coated with a selectively permeable coating (4) for transmitting solar radiation; the heat absorber (1) is a first flow passage of a heat exchange medium (5), and a gap formed between the heat absorber (1) and the glass sleeve (2) is a second flow passage; the opening end of the heat absorber (1) and the opening end of the glass sleeve (2) are arranged on different sides, a heat exchange medium (5) enters a first flow channel from the opening end of the heat absorber (1), then flows out of an opening arranged on the heat absorber (1) to flow into a second flow channel, and finally flows out of the opening end of the glass sleeve (2); the sealing device (3) of the glass sleeve (2) is positioned at the opening end of the heat absorber (1), is arranged between the heat absorber (1) and the glass sleeve (2) and is used for restraining the second flow passage;
when the heat collecting pipe is a flat plate type or vacuum pipe type heat collector, the opening position is at the upper half part of the heat absorber (1); when the heat collecting pipe is a focusing type heat collector, the opening position is positioned at the lower half part of the heat absorber (1); sunlight can be projected not only onto the outer surface of the heat absorber, but also onto the inner surface of the heat absorber through the openings in the heat absorber.
2. The solar heat collecting tube perforated on a heat absorber according to claim 1, wherein when the heat collecting tube is a vacuum tube type solar heat collector, a layer of glass tube (9) is further sleeved outside the heat collecting tube, and vacuum is drawn between the outer layer of glass tube (9) and the inner layer of glass tube (2).
3. Solar collector tube with holes on the absorber according to claim 1, characterized in that the absorber (1) holes are circular, oval, triangular, rectangular or diamond shaped in shape.
4. The solar heat collecting tube with holes on the heat absorber according to claim 1, wherein the number of holes on the heat absorber (1) is plural, and the number of holes is single row hole, double row hole or multiple row hole.
5. Solar collector tube with holes on the absorber according to claim 1, characterized in that the holes on the absorber (1) are equally or unequally spaced.
6. Solar collector tube with holes in the heat absorber according to claim 1, characterized in that each hole size in the heat absorber (1) is equal or unequal.
7. Solar collector tube with holes on the absorber according to claim 1, characterized in that the sealing means (3) is a sealing ring, a sealing strip or a sealing gasket.
8. Solar collector tube with openings in a heat absorber according to claim 1, characterized in that the heat exchanging medium (5) is a light permeable heat exchanging medium.
9. Solar collector tube with openings on a heat absorber according to claim 8, characterized in that the heat exchange medium (5) is water, a brine solution or an alcohol solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811160664.9A CN109357416B (en) | 2018-09-30 | 2018-09-30 | Solar heat collecting tube with holes on heat absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811160664.9A CN109357416B (en) | 2018-09-30 | 2018-09-30 | Solar heat collecting tube with holes on heat absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109357416A CN109357416A (en) | 2019-02-19 |
| CN109357416B true CN109357416B (en) | 2024-03-15 |
Family
ID=65348650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811160664.9A Active CN109357416B (en) | 2018-09-30 | 2018-09-30 | Solar heat collecting tube with holes on heat absorber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109357416B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2773562Y (en) * | 2004-09-17 | 2006-04-19 | 钟汉辉 | Convective circualtion tube of solar water heater |
| CN2842306Y (en) * | 2005-05-23 | 2006-11-29 | 唐绍章 | Solar flatboard type metal light-heat conversion assembly |
| CN101832656A (en) * | 2010-04-21 | 2010-09-15 | 林庆栋 | Solar water heater |
| TWM425255U (en) * | 2011-11-15 | 2012-03-21 | kun-quan Jiang | Tri-pipe deflector type solar vacuum heat collecting tube |
| CN203980693U (en) * | 2014-07-31 | 2014-12-03 | 云南省玉溪市太标太阳能设备有限公司 | With the solar energy air heat collector of thermal-arrest orifice plate |
| CN209569912U (en) * | 2018-09-30 | 2019-11-01 | 天津大学 | A kind of solar energy heat collection pipe of the aperture on heat dump |
-
2018
- 2018-09-30 CN CN201811160664.9A patent/CN109357416B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2773562Y (en) * | 2004-09-17 | 2006-04-19 | 钟汉辉 | Convective circualtion tube of solar water heater |
| CN2842306Y (en) * | 2005-05-23 | 2006-11-29 | 唐绍章 | Solar flatboard type metal light-heat conversion assembly |
| CN101832656A (en) * | 2010-04-21 | 2010-09-15 | 林庆栋 | Solar water heater |
| TWM425255U (en) * | 2011-11-15 | 2012-03-21 | kun-quan Jiang | Tri-pipe deflector type solar vacuum heat collecting tube |
| CN203980693U (en) * | 2014-07-31 | 2014-12-03 | 云南省玉溪市太标太阳能设备有限公司 | With the solar energy air heat collector of thermal-arrest orifice plate |
| CN209569912U (en) * | 2018-09-30 | 2019-11-01 | 天津大学 | A kind of solar energy heat collection pipe of the aperture on heat dump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109357416A (en) | 2019-02-19 |
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