CN104990286A - Composite paraboloid solar collector - Google Patents
Composite paraboloid solar collector Download PDFInfo
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- CN104990286A CN104990286A CN201510355960.4A CN201510355960A CN104990286A CN 104990286 A CN104990286 A CN 104990286A CN 201510355960 A CN201510355960 A CN 201510355960A CN 104990286 A CN104990286 A CN 104990286A
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- heat collector
- heat
- solar collector
- thermal
- collector
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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
The invention relates to a composite paraboloid solar collector. The solar collector comprises a Fresnel reflection collecting mirror array and a solar collector body. The Fresnel reflection collecting mirror array is arranged under the solar collector body. A collector part of the solar collector body is a collector pipe, the outer wall face of the collector pipe is coated with an absorption coating, and the upper wall face of the collector pipe is a composite paraboloid composed of a heat-isolation protective layer and a secondary reflection mirror. The lower wall face of the solar collector body is composed of two layers of glass faces. The upper wall face and the lower wall face of the solar collector body define a closed cavity to form a layer of air wall. The two-layer glass design is adopted, and advantages of a composite paraboloid solar collector without heat-isolation measures and advantages of a composite paraboloid solar collector with a vacuum glass pipe are combined; under the situation that heat losses are not reduced, integration complexity of a system is effectively reduced, the structure is simple, manufacturing and operation cost is low, and safety and stability of the solar collector are improved.
Description
Technical field
The present invention relates to a kind of reflective heat collectors device, especially a kind of based on linear Fresnel reflective heat collectors device, for promoting the efficiency of heat collector, being realized the efficiency utilization of solar energy by the heat radiation reducing heat collector and external environment condition, improving the utilization ratio of the energy.
Background technology
Global environment deterioration and energy crisis have more and more caused the most attention of the whole mankind.At present with regard to the whole nation, be badly in need of development low cost, renewable energy utilization technology easy to use, solar energy does not pollute the environment, and it is one of most clean energy resource, and in today that environmental pollution is more and more serious, this point is extremely preciousness.
Chinese Regional is vast, and solar energy resources enriches, and should carry out solar energy use in daily life energetically.Because solar energy compares dispersion, be that the radiant energy of the sun is put together in the key technology of solar energy heating utilization, be converted to heat energy.Solar thermal collector is a kind of special heat exchanger, and the solar radiant energy of dispersion is converted into heat energy, and its heat energy is passed to working medium.Solar thermal collector is parts crucial in Solar Energy Heat Utilization System, and heat collector absorbs incident solar radiation and is converted into heat energy, so the ability of the absorption solar radiation of heat collector directly determines the efficiency of Solar use.
Solar thermal collector is divided into non-concentrating heat collector and concentrating collector two kinds according to light gathering.Due to unit are, to accept solar radiant energy metric density lower, and non-concentrating heat collector is difficult to reach higher temperature, and parabolic condenser needs again complicated tracking system, expensive.Composite parabolic heat collector (CPC) is a kind of non-imaging concentrator according to edge optical principle design, as long as angle of incidence of light is less than its design load, then can all reflex on thermal-collecting tube, it can absorb energy as the receiver of Fresnel reflecting system.Therefore composite parabolic heat collector (CPC) has a wide range of applications.The receiving system that current linear concentrator solar energy equipment adopts mostly is straight-through type vacuum tubular type CPC reflecting condensation receiving system, outer layer covers due to metal receiving tube one deck or dual-layer vacuum glass sleeve pipe, therefore there is heat loss little, the advantage that collecting efficiency is high, but its initial cost is higher, vacuum tube fault rate is higher, easily causes vacuum leak.
Therefore, need a kind of structure simple, make operating cost low, while not losing heat collector thermal-arrest ability, be easy to the device of the new type compound parabolic collector that large-scale commercial is produced and applied highly significant.On the basis of traditional vacuum tube parabolic collector, remove vacuum heat collection pipe, eliminate the cost that this type of thermal-collecting tube causes high, the high shortcoming easily revealed of fault rate.Double glazing dividing plate is added in heat collector bottom, heat conduction and convection current with external environment condition are reduced to minimum, with vacuum tube type heat collector have play the same tune on different musical instruments wonderful while, greatly reduce initial cost and fault rate, achieve the possibility that compound parabolic collector uses on a large scale.
Summary of the invention
The present invention is directed to problems of the prior art, provide a kind of and can effectively reduce operating cost, be easy to the composite parabolic heat collector of large-scale commercial application.
In order to achieve the above object; technical scheme of the present invention is: a kind of composite parabolic heat collector; comprise Fresnel reflection condenser array, heat collector; described Fresnel reflection condenser array is placed in below heat collector; the heat-collecting part of described heat collector is thermal-collecting tube; thermal-collecting tube outside wall surface is coated with absorber coatings; the composite parabolic that the upper wall surface of described thermal-collecting tube is made up of heat-insulating protective layer and secondary reflection minute surface is formed; the lower wall surface of heat collector is made up of double glazing face; the upper and lower wall of heat collector is encircled into airtight cavity, forms one deck air wall.
Described double glazing face is made up of interior glass and outer glass, and the thickness of described outer glass is 5mm-6mm, and the thickness of interior glass is 3mm, and between described interior glass and outer glass, gap is 9mm-12mm.
Described thermal-collecting tube caliber is 70-200mm.
Described secondary reflection minute surface is compound parabolic, and secondary reflection minute surface and linear Fresnel reflecting condensation lens array (1) are equipped with.
Described Fresnel reflection light-condensing array comprises several planes or bending strip optical mirror plane, and the width of each minute surface is 500-1000mm, and length is 2000-5000mm.
The present invention has following beneficial effect compared to existing technology:
1. effective absorption of solar energy: on the existing basis based on linear Fresnel reflective heat collectors system, the high glass thoroughly of one side is increased in CPC heat collector inside, because the incident angle of light path by double glazing can not change, increase the light path of glass on fresnel reflector not affect, the heat that heat collector absorbs is also unaffected.
2. the lifting of collector efficiency: compared with only having bottom one deck glass plate CPC heat collector with tradition, the immobilising air layer of one deck is had in heat collector double glazing unit, greatly reduce the thermal-arrest cavity temperature reduction that outside free convection causes, because air layer static in double glazing exists, the heat exchange in external environment condition and CPC chamber completes primarily of heat conduction, and the thermal conductivity factor of air is very low, so heat radiation significantly reduces in chamber.Heat radiation minimizing means that more multi-energy is absorbed, and namely improves the efficiency of heat collector.
3. this project with have the contrast of vacuum tube CPC heat collector: have the CPC heat collector of vacuum outer tube be equivalent to thermal-collecting tube outside create adiabatic environment to reduce heat radiation, and after the heat collector increase glass plate of claim, heat collector cavity inside is equivalent to be in one and only has lower surface to have in the environment of heat conduction, because air conduction coefficient is very low, so also can be considered that inside, CPC chamber is in an adiabatic state, identical with the CPC heat collector principle of band vacuum tube, adopt the method will greatly to reduce the manufacture difficulty of CPC heat collector.Economically consider, although fine with the CPC heat collector heat insulation function of vacuum outer tube, owing to having that vacuum tube CPC heat collector cost is high and fault rate is high, come into operation in a large number costly, the improvement that the present invention carries out CPC heat collector, thus achieve the extensive possibility used.
4. pass through the Simulation possibility of this enforcement.The model of simulation is one section of solar thermal collector model of thermal-collecting tube diameter D=180mm pipe range L=5000mm, and entrance Temperature of Working is 300K, and flow time is set to 100s.Analog result accompanying drawing 2, can be found out by analog result, has the heat collector chamber air temperature in double glazing face significantly to rise, exceeds 20 DEG C than without mean temperature in the heat collector chamber of double-deck glass surface, and outlet mean temperature rises about 1.1 DEG C.In heat collector bottom close on the position of glass surface, the heat collector temperature without double-deck glass surface is approximately 310 DEG C, and has the heat collector temperature in double glazing face to be about 340 DEG C.Absolutely prove that double glazing face effectively hinders the heat convection in external environment condition and chamber.Improve the heat-retaining capacity in heat collector chamber.If be used in engineering, when pipe range is tens of hundreds of meters, the efficiency of heat collector will obviously be promoted.
Accompanying drawing explanation
Fig. 1 is structural principle schematic diagram of the present invention;
Fig. 2 is analog result figure of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
See accompanying drawing 1, composite parabolic heat collector of the present invention, comprises Fresnel reflection light-condensing array 1, cavity 2, heat collector 3, heat-insulating protective layer 4, secondary reflection minute surface 5, absorber coatings 6, thermal-collecting tube 7, interior glass surface 8, outer glass surface 9.
Heat collector 3 coordinates with linear Fresnel reflecting condensation lens array 1 and forms solar focusing reflecting system; the heat collector 3 be independently fixedly installed forms energy absorber system; thermal-collecting tube 7 absorption plant outside wall surface scribbles coating for selective absorption 6; the lower wall double glazing face that heat collector 3 is made up of interior glass surface 8, outer glass surface 9 and upper wall surface heat-insulating protective layer 4 are encircled into airtight cavity 2, and airtight cavity 2 effectively can reduce scattering and disappearing of energy.
Fresnel reflection light-condensing array 1 in solar energy reflection system, comprise several planes or slight bending strip optical mirror plane, separately or the following the tracks of the sun around own central axis upset and carry out reflecting condensation of interlock, can be easy to modularized design; The size of concrete each minute surface can conventionally in parameter select, wide be 500-1000mm, and long is 2000-5000mm.
Energy absorber system is made up of described compound parabolic collector, thermal-collecting tube 7 outside is covered with absorber coatings 6, upper wall surface outer setting heat-insulating protective layer 4, effectively prevent scattering and disappearing of heat, secondary reflection minute surface 5 is set in heat insulation layer, secondary reflection minute surface 5 is in parabolic shape, the light part entering heat collector is directly absorbed by thermal-collecting tube 7, another part reflexes on thermal-collecting tube 7 through secondary reflection minute surface 5 and is absorbed by thermal-collecting tube 7, heat collector lower wall surface is by interior, outer glass surface 8, the 9 double glazing face compositions formed, layer glass interplanar distance is 9mm-12mm, double glazing face forms one deck air wall because the less air in space between layer glass does not substantially move, outer glass surface 9 and extraneous contact, because air conduction coefficient is very low, splendid heat insulation effect is played in double glazing face, the heat that heat collector is lost because of heat loss through convection significantly reduces, increase heat-collecting capacity.Again because light is parallel with original optical path by light path after double glazing, therefore the reflection of sunshine can't be affected.
Its process is as described below: focus on thermal-collecting tube 7 after sunshine linear Fresnel reflection condenser array 1 light gathering reflector, be heat energy by coating for selective absorption 6 by light energy conversion, be delivered to inside by the tube wall heat conduction of thermal-collecting tube 7, make its temperature be elevated to operating temperature; The heat that pipe absorbs, at Bottomhole pressure, is taken away by working medium.Due to the existence in double glazing face, greatly reduce the loss of heat collector cavity internal heat, the heat that pipeline is absorbed passes to the working medium of pipe interior, improves the absorptivity to solar energy and utilization rate generally.
Concrete, when the present invention operates, Fresnel reflection light-condensing array 1 sunshine reflexes on the outer glass surface 9 of heat collector bottom, the double glazing face of light by being made up of with interior glass surface 8 outer glass surface 9, light path is constant, focus on incident ray enter into by interior glass surface 8 with heat-insulating protective layer 4 compound parabolic secondary reflection minute surface 5 institute around cavity 2 inside, or selecting in absorber coatings 6 on direct arrival thermal-collecting tube 7 is absorbed, or absorb by compound parabolic secondary reflection mirror 5 two times or multiple reflections to the coating for selective absorption 6 on thermal-collecting tube 7, few some light can be lost in the external world by double glazing face 8 after multiple reflections in cavity, in cavity, institute absorbs solar energy and is converted into heat energy, and the existence of the air wall that the part energy that originally can be lost in atmospheric environment by complicated heat conduction-convection current-radiation coupling diabatic process is formed due to double glazing face, heat conduction and convection current greatly reduce, major part energy is absorbed by thermal-collecting tube.Absorbed energy passes to the working medium of Bottomhole pressure with the form of heat by thermal-collecting tube 7, thus solar thermal energy is constantly transformed into heat.
The invention provides a kind of based on linear Fresnel reflective heat collectors device, the solar concentrating system structure supporting because of it is simple, simple relative to traditional vacuum glass tube heat collector manufacture craft, greatly reduce cost of manufacture, simultaneously compared to tradition without vacuum glass tube heat collector, energy dissipation minimizing.This invention is relatively simple, cheap to the transformation of traditional heat collector, and replicability is strong, has certain economy and reliability.
Claims (5)
1. a composite parabolic heat collector, comprise Fresnel reflection condenser array (1), heat collector (3), described Fresnel reflection condenser array (1) is placed in heat collector (3), it is characterized in that: the heat-collecting part of described heat collector (3) is thermal-collecting tube (7), thermal-collecting tube (7) outside wall surface is coated with absorber coatings (6), the composite parabolic (5) that the upper wall surface of described thermal-collecting tube (7) is made up of heat-insulating protective layer (4) and secondary reflection minute surface is formed, the lower wall surface of heat collector (3) is made up of double glazing face, heat collector (3) upper, lower wall surface is encircled into airtight cavity (2), form one deck air wall.
2. according to the composite parabolic heat collector that right 1 requires, it is characterized in that, described double glazing face is made up of interior glass (8) and outer glass (9), the thickness of described outer glass (9) is 5mm-6mm, the thickness of interior glass (8) is 3mm, and between described interior glass (8) and outer glass (9), gap is 9mm-12mm.
3. composite parabolic heat collector according to claim 1, is characterized in that, described thermal-collecting tube (7) caliber is 70-200mm.
4. composite parabolic heat collector according to claim 1, is characterized in that, described described secondary reflection minute surface (5) is in compound parabolic, and secondary reflection minute surface (5) and linear Fresnel reflecting condensation lens array (1) are equipped with.
5. composite parabolic heat collector according to claim 1, is characterized in that, described Fresnel reflection light-condensing array (1) comprises several planes or bending strip optical mirror plane, and the width of each minute surface is 500-1000mm, and length is 2000-5000mm.
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| CN201510355960.4A CN104990286A (en) | 2015-06-25 | 2015-06-25 | Composite paraboloid solar collector |
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| CN201510355960.4A CN104990286A (en) | 2015-06-25 | 2015-06-25 | Composite paraboloid solar collector |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241081A (en) * | 2015-11-03 | 2016-01-13 | 广东五星太阳能股份有限公司 | Compound parabolic condensation type heat collection and dissipation device with heat collection function at daytime and radiation refrigeration function at night |
| CN106288440A (en) * | 2016-09-13 | 2017-01-04 | 苏州热工研究院有限公司 | A kind of Salar light-gathering structure |
| CN107061205A (en) * | 2017-06-22 | 2017-08-18 | 哈尔滨锅炉厂有限责任公司 | Using carbon dioxide as the Fresnel solar light-heat power-generation system of collection hot working fluid |
| CN107166760A (en) * | 2017-05-18 | 2017-09-15 | 常州大学 | Secondary condensation face strengthens parabolic mirror line-focusing solar collection device |
| CN107166757A (en) * | 2017-05-18 | 2017-09-15 | 常州大学 | The circular Fresnel type solar collecting device of point focusing twice |
| CN107166755A (en) * | 2017-05-18 | 2017-09-15 | 常州大学 | Secondary condensation face strengthens fresnel reflecting mirror line-focusing solar collection device |
| CN107178915A (en) * | 2017-05-18 | 2017-09-19 | 常州大学 | The paraboloid of revolution type solar collecting device of point focusing twice |
| CN110425758A (en) * | 2019-08-30 | 2019-11-08 | 广东工业大学 | A kind of thermal-insulating type solar energy heat collector |
| CN111947333A (en) * | 2020-08-24 | 2020-11-17 | 兰州交通大学 | Secondary condenser for linear Fresnel type light-condensing heat collector |
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| CN203286779U (en) * | 2013-05-28 | 2013-11-13 | 兰州大成科技股份有限公司 | Road space three-dimensional linear Fresnel type solar condensation device |
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Patent Citations (8)
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| US423824A (en) * | 1890-03-18 | Water purifier and cooler | ||
| US4088120A (en) * | 1976-09-02 | 1978-05-09 | Suntec Systems, Inc. | Solar concentrator-collector |
| FR2367256A2 (en) * | 1976-10-08 | 1978-05-05 | Stark Virgil | Solar energy collecting system - focusses sun's rays onto ducts contg. liquids of different boiling points |
| FR2490792A1 (en) * | 1980-09-24 | 1982-03-26 | Sdecc | Movable solar energy collecting panel - comprises fresnel lenses focussing solar radiation on two pipes carrying heat transfer fluid and tracking mechanism rotating system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241081A (en) * | 2015-11-03 | 2016-01-13 | 广东五星太阳能股份有限公司 | Compound parabolic condensation type heat collection and dissipation device with heat collection function at daytime and radiation refrigeration function at night |
| CN106288440A (en) * | 2016-09-13 | 2017-01-04 | 苏州热工研究院有限公司 | A kind of Salar light-gathering structure |
| CN107166760A (en) * | 2017-05-18 | 2017-09-15 | 常州大学 | Secondary condensation face strengthens parabolic mirror line-focusing solar collection device |
| CN107166757A (en) * | 2017-05-18 | 2017-09-15 | 常州大学 | The circular Fresnel type solar collecting device of point focusing twice |
| CN107166755A (en) * | 2017-05-18 | 2017-09-15 | 常州大学 | Secondary condensation face strengthens fresnel reflecting mirror line-focusing solar collection device |
| CN107178915A (en) * | 2017-05-18 | 2017-09-19 | 常州大学 | The paraboloid of revolution type solar collecting device of point focusing twice |
| CN107061205A (en) * | 2017-06-22 | 2017-08-18 | 哈尔滨锅炉厂有限责任公司 | Using carbon dioxide as the Fresnel solar light-heat power-generation system of collection hot working fluid |
| CN110425758A (en) * | 2019-08-30 | 2019-11-08 | 广东工业大学 | A kind of thermal-insulating type solar energy heat collector |
| CN111947333A (en) * | 2020-08-24 | 2020-11-17 | 兰州交通大学 | Secondary condenser for linear Fresnel type light-condensing heat collector |
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