CN105490638A - High-thermal conductivity photoelectric and photothermal board - Google Patents

High-thermal conductivity photoelectric and photothermal board Download PDF

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Publication number
CN105490638A
CN105490638A CN201510891054.6A CN201510891054A CN105490638A CN 105490638 A CN105490638 A CN 105490638A CN 201510891054 A CN201510891054 A CN 201510891054A CN 105490638 A CN105490638 A CN 105490638A
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CN
China
Prior art keywords
heat
conducting plate
plate
photovoltaic
thermal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510891054.6A
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Chinese (zh)
Inventor
张宏泉
代彦军
田娟
求裕军
张海洲
林志坚
黄春华
刘城林
陈海杉
张昀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI BOYON NEW ENERGY TECHNOLOGY Co Ltd
Original Assignee
SHANGHAI BOYON NEW ENERGY TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHANGHAI BOYON NEW ENERGY TECHNOLOGY Co Ltd filed Critical SHANGHAI BOYON NEW ENERGY TECHNOLOGY Co Ltd
Priority to CN201510891054.6A priority Critical patent/CN105490638A/en
Publication of CN105490638A publication Critical patent/CN105490638A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/052Cooling means directly associated or integrated with the PV cell, e.g. integrated Peltier elements for active cooling or heat sinks directly associated with the PV cells
    • H01L31/0521Cooling means directly associated or integrated with the PV cell, e.g. integrated Peltier elements for active cooling or heat sinks directly associated with the PV cells using a gaseous or a liquid coolant, e.g. air flow ventilation, water circulation
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The invention relates to the technical field of solar application, and discloses a high-thermal conductivity photoelectric and photothermal board. The high-thermal conductivity photoelectric and photothermal board comprises a frame, wherein a photovoltaic module and a bottom plate are sequentially arranged in the frame from top to bottom; a heat-conducting plate is arranged between the photovoltaic module and the bottom plate; a water-cooled radiator is arranged on the heat-conducting plate and is provided with a liquid inlet pipe and a liquid outlet pipe; outer ends of the liquid inlet pipe and the liquid outlet pipe extend out of the frame; the bottom plate is provided with a photovoltaic wire holder; the top surface of the heat-conducting plate is a plane; a carbon crystal coating is arranged on the top surface of the heat-conducting plate; and the surface of the carbon crystal coating is connected with the bottom surface of the photovoltaic module through heat-conducting glue. The high-thermal conductivity photoelectric and photothermal board has the beneficial effects that surplus heat of the photovoltaic module is recovered; the photovoltaic module is kept at a stable operating temperature; the photoelectric conversion efficiency is improved; and meanwhile, accumulated snow on the surface can also be cleaned.

Description

A kind of high heat conduction photovoltaic/thermal plate
Technical field
The present invention relates to application of solar, particularly relate to a kind of high heat conduction photovoltaic/thermal plate.
Background technology
Solar energy is inexhaustible, both can generate electricity also can with hot, but current application technology is photovoltaic and photo-thermal is that separately photovoltaic generation conversion efficiency is between 8% ~ 15%, and remaining 80% ~ 90% radiant energy is converted into the heat energy dissipation of photovoltaic module in surrounding environment.Research shows, photovoltaic module is 25 DEG C time, and generating efficiency is the highest, and photovoltaic module surface temperature often rises 1 DEG C, decrease of power generation 0.3% ~ 0.5%.As can be seen here, reduce the temperature of photovoltaic module, effectively can improve generating efficiency.In the winter time, photovoltaic module just cannot work after being avenged covering, needs manually to remove the snow, there is manpower, problem of resource waste.At present photovoltaic panel is lowered the temperature, mostly adopt artificial spray or natural heat dissipation.Artificial spray can form moisture film on photovoltaic module surface, and affect electricity conversion, and cause water resource waste, summer, outdoor temperature was very high, and natural heat dissipation cannot meet cooling requirements, caused electricity conversion low; After winter, electro-optical package was avenged covering, labor cleaning is very difficult.
Summary of the invention
The present invention, in order to overcome the problems referred to above of the prior art, provides one and has and reclaim photovoltaic module and to have more than needed heat, keep the working temperature that it is stable, improve electricity conversion, can also clear up the high heat conduction photovoltaic/thermal plate of surperficial accumulated snow simultaneously.
To achieve these goals, the present invention adopts following technical scheme:
A kind of high heat conduction photovoltaic/thermal plate, comprise frame, photovoltaic module, base plate is provided with successively from top to bottom in described frame, heat-conducting plate is provided with between described photovoltaic module and base plate, described heat-conducting plate is provided with water-cooled heat dump, described water-cooled heat dump is provided with feed tube, drain pipe, and the outer end of described feed tube, drain pipe is stretched out outside frame, and described base plate is provided with photovoltaic junction block.Hot weather, the temperature of photovoltaic module is far above optimum working temperature 25 DEG C, water-cooled heat dump is connected with extraneous endothermic system by feed tube, drain pipe, by coolant (water, oil or gas) at water-cooled heat dump Inner eycle, reclaim the heat on photovoltaic module, thus make the temperature of photovoltaic module remain on about 25 DEG C, improve the electricity conversion of photovoltaic module; Avenge sky in the winter time, snow covers photovoltaic module, and now without the need to labor cleaning's accumulated snow, only need pass into the fluid media (medium) of heat in water-cooled heat dump, water-cooled heat dump is to photovoltaic module heat supply, thus the accumulated snow on fast melt photovoltaic module surface, very convenient.
As preferably, the end face of described heat-conducting plate is plane, and the end face of described heat-conducting plate is provided with carbon crystal coating, and described carbon crystal coating surface is connected by heat-conducting glue with between photovoltaic module bottom surface.Carbon crystal coating has high-termal conductivity, fast heat unnecessary for photovoltaic module can be passed to heat-conducting plate, and coolant circulation can be taken away the heat on heat-conducting plate fast, thus the operational environment keeping photovoltaic module stable; When needs are to photovoltaic module heating and melting accumulated snow, carbon crystal coating can pass to photovoltaic module the heat on heat-conducting plate fast, uniformly.
As preferably, be provided with thermal insulation board between the bottom surface of described heat-conducting plate and base plate, described water-cooled heat dump is fluid channel endothermic tube, the described position of fluid channel endothermic tube between heat-conducting plate and thermal insulation board.Thermal insulation board can isolate the heat exchange between heat-conducting plate and base plate, makes heat-conducting plate can directed heat conduction.
As preferably, the bottom surface of described heat-conducting plate is provided with heat absorption tube seat, the end face of described thermal insulation board is provided with the lower heat absorption tube seat corresponding with upper heat absorption tube seat, the bottom surface of described heat-conducting plate and the end face gluing, sealing of thermal insulation board, described fluid channel endothermic tube is positioned at heat insulation tube seat, lower heat insulation tube seat.Fluid channel endothermic tube is embedded in heat absorption tube seat, lower heat absorption tube seat, plays positioning action on the one hand, can increase the contact area between fluid channel endothermic tube and heat-conducting plate on the other hand, improves heat exchanger effectiveness.
As preferably, the internal diameter of described fluid channel endothermic tube is 2mm-3mm.
As preferably, described heat-conducting plate comprises heat-conducting plate, lower heat-conducting plate, the downside of described upper heat-conducting plate is provided with cooling bath, the upper side of described lower heat-conducting plate is plane, when upper heat-conducting plate, lower heat-conducting plate are superimposed, the upper side of described cooling bath and lower heat-conducting plate surrounds the cooling duct of circulating for coolant, water-cooled heat dump described in described cooling duct is formed, the inner of described feed tube, drain pipe is communicated with the liquid feeding end of cooling duct, outlet end respectively, is provided with thermal insulation board between described lower heat-conducting plate and base plate.Water-cooled heat dump is directly processed on heat-conducting plate, reduces manufacturing cost greatly, and simultaneously the shape of cooling duct, size design are more free, and the manufacturing process not by fluid channel endothermic tube limits; If when coolant is cooling water simultaneously, Long-Time Service, fluid channel endothermic tube inwall easily forms incrustation scale and causes heat conductivility to reduce, the internal duct of fluid channel endothermic tube is complicated, caliber is very little, therefore incrustation scale is removed very difficult, and the cooling duct in this structure, upper heat-conducting plate, lower heat-conducting plate can be cleared up incrustation scale after being separated again, incrustation scale cleaning is very convenient; Eliminate fluid channel endothermic tube, thus make medium directly and between heat-conducting plate carry out heat exchange, heat exchanger effectiveness improves further.
As preferably, described upper heat-conducting plate, one end of lower heat-conducting plate are articulated and connected, the other end bolt of upper heat-conducting plate, lower heat-conducting plate connects, the edge, downside of described upper heat-conducting plate, the upper side edge of lower heat-conducting plate are respectively equipped with annular seal groove, are provided with O-ring seal in described annular seal groove.O-ring seal loads in annular seal groove, then upper heat-conducting plate, lower heat-conducting plate is superimposed links together, outer end is tightened by bolts, and sealing property is fabulous.
As preferably, be provided with annular chamber in described O-ring seal, described O-ring seal is provided with the charging connector be communicated with annular chamber, gassy in described annular chamber, and the gas atmosphere in annular chamber is 1.2-1.6 standard atmospheric pressure.After sealing ring installs, upper heat-conducting plate, lower heat conduction are bolted, because the processing of annular seal groove exists deviation, also there are differences between different O-ring seals, from charging connector gas injection, and control air pressure, from the sealing property that can control each O-ring seal, thus effectively prevent dielectric leakage.
As preferably, the rectangular in cross-section of described cooling bath, the width of described cooling bath is 3mm-5mm, and the degree of depth of described cooling bath is 0.5mm-1.5mm; Filter is provided with in described feed tube, drain pipe.Filter effectively can filter out the impurity in medium, prevents accumulation of impurities in cooling bath, and simultaneously cooling bath is designed to that width is large, the rectangular configuration of depth as shallow, can heat exchange between the raising medium of minimum efficiency and heat-conducting plate.
As preferably, described heat-conducting plate is aluminium sheet, and described photovoltaic module is monocrystalline silicon assembly or polysilicon members.
Therefore, the present invention has the working temperature that photovoltaic module can be kept stable, improves electricity conversion, can also clear up the beneficial effect of surperficial accumulated snow simultaneously.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention.
Fig. 2 is explosive view of the present invention.
Fig. 3 is A place enlarged diagram in Fig. 1.
The execution mode figure of Fig. 4 to be water-cooled heat dump be fluid channel endothermic tube.
Fig. 5 is the second execution mode figure of fluid channel endothermic tube.
Fig. 6 is the third execution mode figure of fluid channel endothermic tube.
Fig. 7 is the second execution mode figure of water-cooled heat dump.
In figure: frame 1, photovoltaic module 2, base plate 3, heat-conducting plate 4, carbon crystal coating 5, heat-conducting glue 6, thermal insulation board 7, fluid channel endothermic tube 8, feed tube 9, drain pipe 10, photovoltaic junction block 11, filter 12, upper heat absorption tube seat 40, upper heat-conducting plate 41, lower heat-conducting plate 42, cooling bath 43, annular seal groove 44, O-ring seal 45, charging connector 46, lower heat absorption tube seat 70.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Embodiment 1: a kind of high heat conduction photovoltaic/thermal plate as depicted in figs. 1 and 2, comprise frame 1, photovoltaic module 2 is provided with successively from top to bottom in frame 1, base plate 3, heat-conducting plate 4 is provided with between photovoltaic module 2 and base plate 3, heat-conducting plate 4 is aluminium sheet, photovoltaic module is monocrystalline silicon assembly, the end face of heat-conducting plate 4 is plane, the end face of heat-conducting plate 4 is provided with carbon crystal coating 5, carbon crystal coating 5 surface is connected by heat-conducting glue 6 with between photovoltaic module 2 bottom surface, thermal insulation board 7 is provided with between the bottom surface of heat-conducting plate 4 and base plate 3, water-cooled heat dump is provided with between heat-conducting plate 4 and thermal insulation board, as shown in Figure 4, water-cooled heat dump is fluid channel endothermic tube 8, fluid channel endothermic tube 8 is provided with feed tube 9, drain pipe 10, feed tube, the outer end of drain pipe is stretched out outside frame 1, feed tube, the outer end of drain pipe is provided with pipe joint, base plate 3 is provided with photovoltaic junction block 11,
As shown in Figure 3, the bottom surface of heat-conducting plate 4 is provided with heat absorption tube seat 40, the end face of thermal insulation board 7 is provided with the lower heat absorption tube seat 70 corresponding with upper heat absorption tube seat, upper heat absorption tube seat, lower endothermic tube groove shape are identical and identical with the shape of fluid channel endothermic tube, the bottom surface of heat-conducting plate and the end face gluing, sealing of thermal insulation board, fluid channel endothermic tube 8 is positioned at heat absorption tube seat, lower heat absorption tube seat, and the internal diameter of fluid channel endothermic tube is 2.5mm.Fig. 5 and Fig. 6 is other two kinds of execution modes of fluid channel endothermic tube 8, and the fluid channel endothermic tube 8 in the present embodiment adopts the execution mode shown in Fig. 4.
Embodiment two: as shown in Figure 7, heat-conducting plate 4 comprises heat-conducting plate 41, lower heat-conducting plate 42, and the downside of upper heat-conducting plate 41 is provided with cooling bath 43, the rectangular in cross-section of cooling bath, and the width of cooling bath is 5mm, and the degree of depth of cooling bath is 1mm; The upper side of lower heat-conducting plate 42 is plane, one end of upper heat-conducting plate, lower heat-conducting plate is articulated and connected, the other end bolt of upper heat-conducting plate, lower heat-conducting plate connects, when upper heat-conducting plate, lower heat-conducting plate are superimposed, cooling bath 43 surrounds the cooling duct of circulating for coolant with the upper side of lower heat-conducting plate, cooling duct forms water-cooled heat dump, the inner of feed tube 9, drain pipe 10 is communicated with the liquid feeding end of cooling duct, outlet end respectively, be provided with filter 12 in feed tube, drain pipe, the outer end of feed tube, drain pipe is provided with pipe joint;
The edge, downside of upper heat-conducting plate 41, the upper side edge of lower heat-conducting plate 42 are respectively equipped with annular seal groove 44, are provided with O-ring seal 45 in annular seal groove 44; Be provided with annular chamber in O-ring seal 45, O-ring seal is provided with the charging connector 46 be communicated with annular chamber, gassy in annular chamber, and the gas atmosphere in annular chamber is 1.2 standard atmospheric pressures.
Hot weather, the temperature of photovoltaic module is far above optimum working temperature 25 DEG C, water-cooled heat dump is connected with extraneous endothermic system by feed tube, drain pipe, by coolant (water, oil or gas) at water-cooled heat dump Inner eycle, reclaim the heat on photovoltaic module, thus make the temperature of photovoltaic module remain on about 25 DEG C, improve the electricity conversion of photovoltaic module; Avenge sky in the winter time, snow covers photovoltaic module, and now without the need to labor cleaning's accumulated snow, only need pass into the fluid media (medium) of heat in water-cooled heat dump, water-cooled heat dump is to photovoltaic module heat supply, thus the accumulated snow on fast melt photovoltaic module surface, very convenient.

Claims (10)

1. one kind high heat conduction photovoltaic/thermal plate, comprise frame, photovoltaic module, base plate is provided with successively from top to bottom in described frame, it is characterized in that, be provided with heat-conducting plate between described photovoltaic module and base plate, described heat-conducting plate is provided with water-cooled heat dump, and described water-cooled heat dump is provided with feed tube, drain pipe, the outer end of described feed tube, drain pipe is stretched out outside frame, and described base plate is provided with photovoltaic junction block.
2. one according to claim 1 high heat conduction photovoltaic/thermal plate, is characterized in that, the end face of described heat-conducting plate is plane, and the end face of described heat-conducting plate is provided with carbon crystal coating, and described carbon crystal coating surface is connected by heat-conducting glue with between photovoltaic module bottom surface.
3. one according to claim 1 and 2 high heat conduction photovoltaic/thermal plate, it is characterized in that, be provided with thermal insulation board between the bottom surface of described heat-conducting plate and base plate, described water-cooled heat dump is fluid channel endothermic tube, the described position of fluid channel endothermic tube between heat-conducting plate and thermal insulation board.
4. one according to claim 3 high heat conduction photovoltaic/thermal plate, it is characterized in that, the bottom surface of described heat-conducting plate is provided with heat absorption tube seat, the end face of described thermal insulation board is provided with the lower heat absorption tube seat corresponding with upper heat absorption tube seat, the bottom surface of described heat-conducting plate and the end face gluing, sealing of thermal insulation board, described fluid channel endothermic tube is positioned at heat absorption tube seat, lower heat absorption tube seat.
5. one according to claim 4 high heat conduction photovoltaic/thermal plate, is characterized in that, the internal diameter of described fluid channel endothermic tube is 2mm-3mm.
6. one according to claim 1 and 2 high heat conduction photovoltaic/thermal plate, it is characterized in that, described heat-conducting plate comprises heat-conducting plate, lower heat-conducting plate, the downside of described upper heat-conducting plate is provided with cooling bath, the upper side of described lower heat-conducting plate is plane, when upper heat-conducting plate, when lower heat-conducting plate is superimposed, the upper side of described cooling bath and lower heat-conducting plate surrounds the cooling duct of circulating for coolant, water-cooled heat dump described in described cooling duct is formed, described feed tube, the inner of drain pipe respectively with the liquid feeding end of cooling duct, outlet end is communicated with, thermal insulation board is provided with between described lower heat-conducting plate and base plate.
7. one according to claim 6 high heat conduction photovoltaic/thermal plate, it is characterized in that, described upper heat-conducting plate, one end of lower heat-conducting plate are articulated and connected, the other end bolt of upper heat-conducting plate, lower heat-conducting plate connects, the edge, downside of described upper heat-conducting plate, the upper side edge of lower heat-conducting plate are respectively equipped with annular seal groove, are provided with O-ring seal in described annular seal groove.
8. one according to claim 7 high heat conduction photovoltaic/thermal plate, it is characterized in that, annular chamber is provided with in described O-ring seal, described O-ring seal is provided with the charging connector be communicated with annular chamber, gassy in described annular chamber, the gas atmosphere in annular chamber is 1.2-1.6 standard atmospheric pressure.
9. one according to claim 6 high heat conduction photovoltaic/thermal plate, is characterized in that, the rectangular in cross-section of described cooling bath, and the width of described cooling bath is 3mm-5mm, and the degree of depth of described cooling bath is 0.5mm-1.5mm; Filter is provided with in described feed tube, drain pipe.
10. one according to claim 1 high heat conduction photovoltaic/thermal plate, is characterized in that, described heat-conducting plate is aluminium sheet, and described photovoltaic module is monocrystalline silicon assembly or polysilicon members.
CN201510891054.6A 2015-12-06 2015-12-06 High-thermal conductivity photoelectric and photothermal board Pending CN105490638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510891054.6A CN105490638A (en) 2015-12-06 2015-12-06 High-thermal conductivity photoelectric and photothermal board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510891054.6A CN105490638A (en) 2015-12-06 2015-12-06 High-thermal conductivity photoelectric and photothermal board

Publications (1)

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CN105490638A true CN105490638A (en) 2016-04-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107388602A (en) * 2017-06-26 2017-11-24 东南大学 A kind of photovoltaic and photothermal integral device

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CN102646742A (en) * 2012-04-26 2012-08-22 中南大学 Plate heat tube type solar photovoltaic-photothermal composite heat collector and production process thereof
CN103759432A (en) * 2014-01-06 2014-04-30 南通星昀能源科技有限公司 Superthin superconducting-type heat absorbing plate core and flat-plate solar collector
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CN203797770U (en) * 2014-05-06 2014-08-27 沈阳威远国际能源技术有限公司 Solar energy carbon crystal electric heating plate
CN203839391U (en) * 2014-06-03 2014-09-17 重庆师范大学 Solar photovoltaic and photo-thermal composite assembly
CN204145411U (en) * 2014-09-04 2015-02-04 河南新大新材料股份有限公司 Plate-tube type solar photoelectric light-heat assembly
CN104976801A (en) * 2015-06-05 2015-10-14 孙红琴 Heat collecting plate core and flat-plate type solar thermal collector
CN205232150U (en) * 2015-12-06 2016-05-11 上海博阳新能源科技有限公司 Photoelectricity light and heat plate structure

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102646742A (en) * 2012-04-26 2012-08-22 中南大学 Plate heat tube type solar photovoltaic-photothermal composite heat collector and production process thereof
CN103759432A (en) * 2014-01-06 2014-04-30 南通星昀能源科技有限公司 Superthin superconducting-type heat absorbing plate core and flat-plate solar collector
CN203671950U (en) * 2014-01-06 2014-06-25 南通星昀能源科技有限公司 Ultra-thin and super-conductive heat absorption plate core and flat plate type solar thermal collector
CN203797770U (en) * 2014-05-06 2014-08-27 沈阳威远国际能源技术有限公司 Solar energy carbon crystal electric heating plate
CN203839391U (en) * 2014-06-03 2014-09-17 重庆师范大学 Solar photovoltaic and photo-thermal composite assembly
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107388602A (en) * 2017-06-26 2017-11-24 东南大学 A kind of photovoltaic and photothermal integral device
CN107388602B (en) * 2017-06-26 2019-04-30 东南大学 A kind of photovoltaic and photothermal integral device

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