CN104539238A - Magnetic nano-fluid light condensation type photovoltaic combined heat and power generation device - Google Patents
Magnetic nano-fluid light condensation type photovoltaic combined heat and power generation device Download PDFInfo
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- CN104539238A CN104539238A CN201410842048.7A CN201410842048A CN104539238A CN 104539238 A CN104539238 A CN 104539238A CN 201410842048 A CN201410842048 A CN 201410842048A CN 104539238 A CN104539238 A CN 104539238A
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- 239000012530 fluid Substances 0.000 title claims abstract description 38
- 230000005494 condensation Effects 0.000 title abstract 4
- 238000009833 condensation Methods 0.000 title abstract 4
- 238000010248 power generation Methods 0.000 title abstract 4
- 230000008859 change Effects 0.000 claims abstract description 10
- 210000003850 cellular structure Anatomy 0.000 claims description 28
- 230000008676 import Effects 0.000 claims description 15
- 230000004907 flux Effects 0.000 claims description 14
- 150000003839 salts Chemical class 0.000 claims description 9
- 238000009825 accumulation Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 239000002105 nanoparticle Substances 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000010425 asbestos Substances 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 3
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 3
- 235000019800 disodium phosphate Nutrition 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 229920006327 polystyrene foam Polymers 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000005338 heat storage Methods 0.000 abstract 2
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000005619 thermoelectricity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005352 galvanomagnetic phenomena Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
-
- 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
- Y02E10/50—Photovoltaic [PV] energy
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- Photovoltaic Devices (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a magnetic nano-fluid light condensation type photovoltaic combined heat and power generation device. The magnetic nano-fluid light condensation type photovoltaic combined heat and power generation device comprises a photovoltaic cell assembly module, a heat storage assembly, a photo-thermal assembly and a magnetic field adjusting assembly; the heat storage assembly comprises a heat reservoir and a heat exchange pipe; the heat reservoir is internally provided with phase change media; an inlet and an outlet of the heat exchange pipe are exposed out of the heat reservoir; the photo-thermal assembly comprises a circulating pump, a first header, a second header, multiple transparent heat gathering pipes, multiple uniform light bodies, Fresnel lenses and a framework; the uniform light bodies are polygon prisms; the area of the upper surface of the polygon prisms is greater than that of the bottom of the polygon prisms; the magnetic field adjusting assembly comprises S-shaped magnets and coils wound around the arms of the S-shaped magnets, one heat gathering pipe is arranged between the arms of every two adjacent magnets, and the S-shaped magnets and the heat gathering pipes are located on the same plane; the heat exchange pipe, the heat gathering pipes, the circulating pump, the first header and the second header are all internally provided with nano-fluid which can circulate and flow. The magnetic nano-fluid light condensation type photovoltaic combined heat and power generation device has the advantages of being simple in structure, capable of improving the solar energy utilization ratio, and the like.
Description
Technical field
The present invention relates to a kind of photovoltaic cogeneration system, be specifically related to the light collecting photovoltaic cogeneration system of a kind of magnetic nano-fluid.
Background technology
Because solar energy resources enriches, and energy savings will be pursued by society now, and therefore, the exploitation of solar energy have great potentiality.At present, the technology that utilizes of solar energy mainly contains the basic mode such as photothermal deformation, photovoltaic generation.But, although photovoltaic generation can obtain high-grade electric energy product, but it is lower that its subject matter is photoelectric conversion efficiency, make cost higher, and the spectrum band limits of available sunlight is narrower, the conversion efficiency of the common photovoltaic cell in prior art is also only at about 10%-20%.Mainly infrared part is concentrated on to the utilization of solar energy optical-thermal, and conversion efficiency is relatively high.If can utilize all band of sunlight, can the utilance of solar energy to a great extent.
Traditional flat PV/T(photoelectricity, light-heat integration) system is by photovoltaic cell component module for power supply, and photovoltaic cell component module can produce the transformation efficiency that large calorimetric can affect photoelectricity in the course of the work, because electricity conversion can reduce with the rising of temperature, cooling working medium is just by the heat exchange with photovoltaic cell component module, the object that plate gentleness produces hot working fluid is reduced to reach, like this, both improve electricity conversion, meet heat load to a certain extent again.But often this heating effect is unsatisfactory, general summer fever coolant-temperature gage can reach 40-60 DEG C, and the water temperature in winter only has about 10-30 DEG C, still can not satisfy the demands like this to the utilance of solar energy.
Summary of the invention
The object of the invention is: not only structure is simple to provide one, and the light collecting photovoltaic cogeneration system of the magnetic nano-fluid that can improve solar energy utilization ratio, to overcome the deficiencies in the prior art.
In order to achieve the above object, technical scheme of the present invention is: the light collecting photovoltaic cogeneration system of a kind of magnetic nano-fluid, comprise photovoltaic cell component module, the photovoltaic cell component that described photovoltaic cell component module is matrix form arrangement by several is formed, and its innovative point is: also comprise heat accumulation assembly, photo-thermal assembly and flux control assembly;
Described heat accumulation assembly comprises thermal storage device and heat exchanger tube, is provided with phase change medium in thermal storage device, and heat exchanger tube large part is in thermal storage device, and the import of heat exchanger tube and outlet are exposed at outside thermal storage device;
Described photo-thermal assembly comprises circulating pump, the first header, the second header, the thermal-collecting tube of multiple transparent shape and several even body of light, Fresnel Lenses and framework, described even body of light is many ribs lens, and the area of the upper surface of many ribs lens is greater than its bottom area;
Described multiple thermal-collecting tube separates and is set in parallel in the front of the photovoltaic cell component that photovoltaic cell component module is often gone, several even body of light are fixedly connected on the front of corresponding thermal-collecting tube respectively, and each even body of light is all positioned at the frontal of corresponding photovoltaic cell component, be arranged on the frontal of even body of light described frame space certain distance, described Fresnel Lenses is arranged in matrix form on framework, and each even body of light frontal all has a Fresnel Lenses;
Described circulation delivery side of pump is connected with the import of heat exchanger tube, and the outlet of heat exchanger tube is connected with the import of the first header,
One end of thermal-collecting tube is connected with the outlet of the first header, and the other end of thermal-collecting tube is connected with the import of the second header, and the outlet of the second header is connected with the import of circulating pump;
Described flux control assembly comprises snakelike magnet and is wrapped in the coil on snakelike magnet arm, and all have a thermal-collecting tube between two adjacent magnet arms, snakelike magnet and multiple thermal-collecting tube are at grade;
All nano-fluid is had in described heat exchanger tube, thermal-collecting tube, circulating pump, the first header and the second header.
In technique scheme, described nano-fluid is Fe
3o
4, or TiO
2, or the nano particle of shell core formula structure, the shell of the nano particle of described shell core formula structure is SiO
2, and inner core is Fe
3o
4, or TiO
2, or Ni or Co.
In technique scheme, the phase change medium in described thermal storage device is sodium sulphate hydrated salt or sodium hydrogen phosphate 12 hydrated salt or calcium chloride hydrated salt or paraffin.
In technique scheme, the periphery of described thermal storage device is coated with heat-insulation layer.
In technique scheme, described heat-insulation layer is the plate that polystyrene foam plastics or asbestos or polyurethane material are made.
In technique scheme, also comprise the installing rack of U-shaped shape, the two ends of described framework are erected on the frame of installing rack respectively, described photovoltaic cell component module, even body of light, thermal-collecting tube and flux control assembly are located at the bottom of installing rack, and the spacing distance between described framework and even body of light controls within the scope of 10mm ~ 50mm.
In technique scheme, described coil is electrically connected with regulated power supply.
The good effect that the present invention has is: after adopting combined production device of the present invention, and the advantage that the present invention has is,
1, the making full use of of all band frequency spectrum of solar radiation: visible ray is the main source of electric energy, infrared light is the main source of heat energy, the optical characteristics of nano-fluid is regulated by flux control assembly, make the energy of the high efficiency absorption infrared light of magnetic nano-fluid energy, and the energy that photovoltaic cell component module absorbs visible ray can carry out photoelectric conversion, the conversion efficiency of described photovoltaic cell component module is about 12% ~ 25%, the present invention can make full use of solar energy all band spectrum, is a kind of means of efficiency utilization solar energy.
2, storing heat: nanometer magnetofluid of the present invention can absorb most infrared light in solar radiation, by the phase change medium be provided with in heat accumulation assembly, energy storing heat, like this, not only energy-conserving and environment-protective, can also improve the utilance of solar energy.
3, regulatable thermoelectricity exports: flux control assembly of the present invention can adjust accordingly the absorption of nano-fluid, refracting characteristic, under the influence of a magnetic field, enhance absorption characteristic and the heat-transfer character of nano-fluid, transmissivity reduces, and in certain magnetic field strength range, absorption characteristic and the heat-transfer character of nano-fluid strengthen with the enhancing of magnetic field intensity, and then the adjustability to export for the thermoelectricity of the heating integrated device of photovoltaic provide a kind of may, for the difference of the thermoelectricity demand of user provides flexibility.
Accompanying drawing explanation
Fig. 1 is the front view of a kind of embodiment of the present invention;
Fig. 2 is the A-A cross-sectional schematic of Fig. 1;
Fig. 3 is the B-B cross-sectional schematic of Fig. 1;
Fig. 4 is the C-C cross-sectional schematic of Fig. 3.
Embodiment
Below in conjunction with accompanying drawing and the embodiment that provides, the present invention is further illustrated, but be not limited thereto.
As shown in Figure 1,2,3, 4, the light collecting photovoltaic cogeneration system of a kind of magnetic nano-fluid, comprise photovoltaic cell component module 1, the photovoltaic cell component 1-1 that described photovoltaic cell component module 1 is matrix form arrangement by several is formed, and also comprises heat accumulation assembly 2, photo-thermal assembly 3 and flux control assembly 4;
Described heat accumulation assembly 2 comprises thermal storage device 2-1 and heat exchanger tube 2-2, is provided with phase change medium in thermal storage device 2-1, and heat exchanger tube 2-2 large part is in thermal storage device 2-1, and import 2-2-1 and the outlet 2-2-2 of heat exchanger tube 2-2 are exposed at outside thermal storage device 2-1;
Described photo-thermal assembly 3 comprises circulating pump 3-4, the first header 3-5, the second header 3-6, the thermal-collecting tube 3-3 of multiple transparent shape and several even body of light 3-2, Fresnel Lenses 3-1 and framework 10, described even body of light 3-2 is many ribs lens, and the area of the upper surface of many ribs lens is greater than its bottom area;
Described multiple thermal-collecting tube 3-3 separates and is set in parallel in the front of the photovoltaic cell component 1-1 that photovoltaic cell component module 1 is often gone, several even body of light 3-2 are fixedly connected on the front of corresponding thermal-collecting tube 3-3 respectively, and each even body of light 3-2 is all positioned at the frontal of corresponding photovoltaic cell component 1-1, described framework 10 is arranged on the frontal of even body of light 3-2 with keeping at a certain distance away, described Fresnel Lenses 3-1 arranges in matrix form on framework 10, and each even body of light 3-2 frontal all has a Fresnel Lenses 3-1;
The outlet of described circulating pump 3-4 is connected with the import 2-2-1 of heat exchanger tube 2-2, and the outlet 2-2-2 of heat exchanger tube 2-2 is connected with the import 3-5-1 of the first header 3-5,
One end of thermal-collecting tube 3-3 is connected with the outlet 3-5-2 of the first header 3-5, and the other end of thermal-collecting tube 3-3 is connected with the import 3-6-1 of the second header 3-6, and the outlet 3-6-2 of the second header 3-6 is connected with the import of circulating pump 3-4;
Described flux control assembly 4 comprises snakelike magnet 4-1 and is wrapped in the coil 4-2 on snakelike magnet 4-1 arm, and all have a thermal-collecting tube 3-3 between two adjacent magnet 4-1 arms, snakelike magnet 4-1 and multiple thermal-collecting tube 3-3 is at grade;
All nano-fluid is had in described heat exchanger tube 2-2, thermal-collecting tube 3-3, circulating pump 3-4, the first header 3-5 and the second header 3-6.
Nano-fluid of the present invention is Fe
3o
4, or TiO
2, or the nano particle of shell core formula structure, the shell of the nano particle of described shell core formula structure is SiO
2, and inner core is Fe
3o
4, or TiO
2, or Ni or Co.Described nano-fluid is nanometer ultramicro particles, and the ultramicro powder particle diameter of nanometer is on average within the scope of 20nm-50nm, and the percent concentration of particle diameter volume is 1 ~ 3%.
Phase change medium in thermal storage device 2-1 of the present invention is sodium sulphate hydrated salt or sodium hydrogen phosphate 12 hydrated salt or calcium chloride hydrated salt or paraffin.
As shown in Figure 3, in order to prevent the heat that stores in thermal storage device 2-1 and external environment from carrying out exchange heat, the periphery of described thermal storage device 2-1 is coated with heat-insulation layer 5.Described heat-insulation layer 5 is plates that polystyrene foam plastics or asbestos or polyurethane material are made.
As shown in Figure 2, in order to make structure of the present invention more reasonable, also comprise the installing rack 7 of U-shaped shape, the two ends of described framework 10 are erected on the frame of installing rack 7 respectively, described photovoltaic cell component module 1, even body of light 3-2, thermal-collecting tube 3-3 and flux control assembly 4 are located at the bottom of installing rack 7, and the spacing distance between described framework 10 and even body of light 3-2 controls within the scope of 10mm ~ 50mm.
As shown in Figure 1,3, described regulated power supply 8 is adjustable direct voltage sources, galvanomagnetic effect for coil 4-2 produces magnetic field, by changing the direct voltage that regulated power supply 8 exports, adjustable magnetic fields size, and then change nano-fluid has different characteristics under different magnetic flux density, and nano-fluid can be regulated the absorption of solar energy infrared light wavelength coverage or refracting characteristic, and the demand of actual conditions is met with this, described coil 4-2 is electrically connected with regulated power supply 8.
The present invention can make full use of solar spectral, and a kind of means improving nano fluid heat transferring performance are provided, the optical characteristics of nano-fluid is regulated by flux control assembly, make the energy of the high efficiency absorption infrared light of magnetic nano-fluid energy, and the energy that photovoltaic cell component module absorbs visible ray can carry out photoelectric conversion, the conversion efficiency of described photovoltaic cell component module is about 12% ~ 25%; Nanometer magnetofluid can absorb most infrared light in solar radiation, by the phase change medium be provided with in heat accumulation assembly, and energy storing heat, like this, not only energy-conserving and environment-protective, can also improve the utilance of solar energy; Flux control assembly of the present invention can adjust accordingly the absorption of nano-fluid, refracting characteristic, under the influence of a magnetic field, enhance absorption characteristic and the heat-transfer character of nano-fluid, transmissivity reduces, and in certain magnetic field strength range, absorption characteristic and the heat-transfer character of nano-fluid strengthen with the enhancing of magnetic field intensity.
Claims (7)
1. the light collecting photovoltaic cogeneration system of magnetic nano-fluid, comprise photovoltaic cell component module (1), the photovoltaic cell component (1-1) that described photovoltaic cell component module (1) is matrix form arrangement by several is formed, and it is characterized in that: also comprise heat accumulation assembly (2), photo-thermal assembly (3) and flux control assembly (4);
Described heat accumulation assembly (2) comprises thermal storage device (2-1) and heat exchanger tube (2-2), phase change medium is provided with in thermal storage device (2-1), heat exchanger tube (2-2) large part is in thermal storage device (2-1), and import (2-2-1) and the outlet (2-2-2) of heat exchanger tube (2-2) are exposed at outside thermal storage device (2-1);
Described photo-thermal assembly (3) comprises circulating pump (3-4), the first header (3-5), the second header (3-6), the thermal-collecting tube (3-3) of multiple transparent shape and several even body of light (3-2), Fresnel Lenses (3-1) and framework (10), described even body of light (3-2) is many ribs lens, and the area of the upper surface of many ribs lens is greater than its bottom area;
Described multiple thermal-collecting tube (3-3) is separated and is set in parallel in the front of the photovoltaic cell component (1-1) that photovoltaic cell component module (1) is often gone, several even body of light (3-2) are fixedly connected on the front of corresponding thermal-collecting tube (3-3) respectively, and each even body of light (3-2) is all positioned at the frontal of corresponding photovoltaic cell component (1-1), described framework (10) is arranged on the frontal of even body of light (3-2) with keeping at a certain distance away, described Fresnel Lenses (3-1) is upper at framework (10) is that matrix form is arranged, and each even body of light (3-2) frontal all has a Fresnel Lenses (3-1),
The outlet of described circulating pump (3-4) is connected with the import (2-2-1) of heat exchanger tube (2-2), and the outlet (2-2-2) of heat exchanger tube (2-2) is connected with the import (3-5-1) of the first header (3-5),
One end of thermal-collecting tube (3-3) is connected with the outlet (3-5-2) of the first header (3-5), the other end of thermal-collecting tube (3-3) is connected with the import (3-6-1) of the second header (3-6), and the outlet (3-6-2) of the second header (3-6) is connected with the import of circulating pump (3-4);
Described flux control assembly (4) comprises snakelike magnet (4-1) and is wrapped in the coil (4-2) on snakelike magnet (4-1) arm, all have a thermal-collecting tube (3-3) between two adjacent magnet (4-1) arms, snakelike magnet (4-1) and multiple thermal-collecting tube (3-3) are at grade;
All nano-fluid is had in described heat exchanger tube (2-2), thermal-collecting tube (3-3), circulating pump (3-4), the first header (3-5) and the second header (3-6).
2. the light collecting photovoltaic cogeneration system of magnetic nano-fluid according to claim 1, is characterized in that: described nano-fluid is Fe
3o
4, or TiO
2, or the nano particle of shell core formula structure, the shell of the nano particle of described shell core formula structure is SiO
2, and inner core is Fe
3o
4, or TiO
2, or Ni or Co.
3. the light collecting photovoltaic cogeneration system of magnetic nano-fluid according to claim 1, is characterized in that: the phase change medium in described thermal storage device (2-1) is sodium sulphate hydrated salt or sodium hydrogen phosphate 12 hydrated salt or calcium chloride hydrated salt or paraffin.
4. the light collecting photovoltaic cogeneration system of magnetic nano-fluid according to claim 1, is characterized in that:
The periphery of described thermal storage device (2-1) is coated with heat-insulation layer (5).
5. the light collecting photovoltaic cogeneration system of magnetic nano-fluid according to claim 1, is characterized in that: described heat-insulation layer (5) is the plate that polystyrene foam plastics or asbestos or polyurethane material are made.
6. the light collecting photovoltaic cogeneration system of magnetic nano-fluid according to claim 1, it is characterized in that: the installing rack (7) also comprising U-shaped shape, the two ends of described framework (10) are erected on the frame of installing rack (7) respectively, described photovoltaic cell component module (1), even body of light (3-2), thermal-collecting tube (3-3) and flux control assembly (4) are located at the bottom of installing rack (7), and the spacing distance between described framework (10) and even body of light (3-2) controls within the scope of 10mm ~ 50mm.
7. the light collecting photovoltaic cogeneration system of magnetic nano-fluid according to claim 1, is characterized in that: described coil (4-2) is electrically connected with regulated power supply (8).
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| CN106788222A (en) * | 2016-12-08 | 2017-05-31 | 河海大学常州校区 | A kind of solar cell double fluid layer electrothermal combined system based on nano-fluid |
| CN107974240A (en) * | 2017-11-18 | 2018-05-01 | 山东龙光天旭太阳能有限公司 | A kind of effective nano fluid heat transferring working medium of solar energy heating and preparation method |
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| CN105823236B (en) * | 2016-04-06 | 2018-01-19 | 河海大学常州校区 | A kind of light-focusing type photovoltaic thermal based on magnetic Nano fluid |
| CN106788222A (en) * | 2016-12-08 | 2017-05-31 | 河海大学常州校区 | A kind of solar cell double fluid layer electrothermal combined system based on nano-fluid |
| CN106656027A (en) * | 2017-01-06 | 2017-05-10 | 河海大学常州校区 | Nano-fluid based solar electricity and heat combined utilization device |
| CN107974240A (en) * | 2017-11-18 | 2018-05-01 | 山东龙光天旭太阳能有限公司 | A kind of effective nano fluid heat transferring working medium of solar energy heating and preparation method |
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