CN212109046U - Waste heat recovery device of photovoltaic power generation system - Google Patents
Waste heat recovery device of photovoltaic power generation system Download PDFInfo
- Publication number
- CN212109046U CN212109046U CN202020106935.9U CN202020106935U CN212109046U CN 212109046 U CN212109046 U CN 212109046U CN 202020106935 U CN202020106935 U CN 202020106935U CN 212109046 U CN212109046 U CN 212109046U
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- heat exchanger
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- 238000010248 power generation Methods 0.000 title claims abstract description 42
- 238000011084 recovery Methods 0.000 title claims abstract description 18
- 239000002918 waste heat Substances 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 description 18
- 238000009529 body temperature measurement Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000002313 adhesive film Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002082 metal nanoparticle Substances 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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- 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
-
- 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
- Y02E10/60—Thermal-PV hybrids
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- Photovoltaic Devices (AREA)
Abstract
The utility model discloses a waste heat recovery device of a photovoltaic power generation system, which comprises a first heat exchange system and a second heat exchange system which exchanges heat with the first heat exchange system, wherein the first heat exchange system comprises a photovoltaic power generation plate, a first heat exchanger, a first liquid storage tank, a first liquid pump and a circulation pipeline, the first heat exchanger, the first liquid storage tank and the first liquid pump are all arranged on the circulation pipeline, and the first heat exchanger is arranged at the back of the photovoltaic power generation plate; the second heat exchange system comprises a second heat exchanger, a second liquid pump, a second liquid storage tank and a water supply pipeline, the second heat exchanger, the second liquid pump and the second liquid storage tank are all arranged on the water supply pipeline, and the water supply pipeline and the circulating pipeline are all connected to the second heat exchanger. The utility model has the advantages that: the device exchanges heat between the latent heat energy obtained by heat exchange of the nano fluid and water flowing into the heat exchanger from the outside, and the obtained hot water is used indoors, so that the exergy efficiency of the system is improved.
Description
Technical Field
The utility model relates to a heat transfer system uses technical field, concretely relates to photovoltaic power generation system waste heat recovery device.
Background
With the development of global science and technology and the increasing prominence of energy problems, the enhanced heat transfer plays a significant and even critical role in the development and conservation of energy, and has become a very attractive research field in modern heat transfer science. At present, the requirements of various industries on heat transfer load and heat transfer strength of a heat exchange system are increasingly increased, the structural size limitation and the use environment of heat exchange equipment are also increasingly strict, the requirements on performance indexes such as high efficiency, low resistance and compactness of the heat exchange system are also increasingly high, and particularly, higher requirements are provided for heat transfer enhancement technology in the fields of energy, chemical industry, aerospace, microelectronics, information and the like.
Experimental research shows that the cost of a photovoltaic power generation system is reduced by 7% when the photovoltaic power generation efficiency is improved by 1%. Therefore, a plurality of scientific researchers have intensively studied the heat transfer enhancement technology of the heat exchange system, and the new efficient heat exchange matrix with high heat conductivity and good heat transfer performance is provided to become a hotspot for researching a new generation of efficient cooling technology. In recent years, rapid development of nanomaterials and technologies has brought new opportunities for solid particles to enhance fluid heat transfer. Choi et al first proposed the concept of nanofluids, i.e. adding metal nanoparticles to a conventional fluid to form a new heat exchange matrix (nanofluids), which is an innovative study of nanotechnology applied to heat transfer science. In recent decades, many scientific researchers have conducted a great deal of theoretical and experimental research on nanofluids in succession, and have focused on the preparation of novel nanofluids and the testing of the properties of the novel nanofluids such as heat conduction, convection, phase change heat exchange and the like, and have continuously explored the heat transfer enhancement technical mechanism of nanofluids, and promoted the application of the heat transfer enhancement technology of nanofluids in industry. In recent years, there have been many scientific researchers made extensive studies on the heat transfer performance of nanofluids in micro-ducts, and certain results have been achieved. Recently, a high-strength refrigerating system of a micro-pipeline radiator is developed abroad by utilizing a nano-fluid enhanced heat transfer technology, the nano-fluid has a very wide application prospect in the field of enhanced heat exchange, and a guiding effect is provided for solving the cooling problem of high-temperature elements of heat exchange systems in various fields.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a photovoltaic power generation system waste heat recovery device rational in infrastructure, design benefit.
The technical scheme of the utility model as follows:
the waste heat recovery device of the photovoltaic power generation system is characterized by comprising a first heat exchange system and a second heat exchange system which exchanges heat with the first heat exchange system, wherein the first heat exchange system comprises a photovoltaic power generation plate, a first heat exchanger, a first liquid storage tank, a first liquid pump and a circulation pipeline; the second heat exchange system comprises a second heat exchanger, a second liquid pump, a second liquid storage tank and a water supply pipeline, the second heat exchanger, the second liquid pump and the second liquid storage tank are all arranged on the water supply pipeline, and the water supply pipeline and the circulating pipeline are all connected to the second heat exchanger.
The waste heat recovery device for the photovoltaic power generation system is characterized in that a first thermocouple temperature measuring node is arranged at an inlet of the first heat exchanger on the circulating pipeline, and a second thermocouple temperature measuring node is arranged at an outlet of the first heat exchanger on the circulating pipeline.
The waste heat recovery device of the photovoltaic power generation system is characterized in that a stop valve and a flow meter are arranged on the circulating pipeline between the first thermocouple temperature measuring node and the second liquid pump.
The waste heat recovery device of the photovoltaic power generation system is characterized in that a bypass pipeline is arranged on the circulation pipeline between the left side of the first liquid pump and the right side of the first liquid storage tank, and a bypass valve is arranged on the bypass pipeline.
The waste heat recovery device of the photovoltaic power generation system is characterized in that the bypass pipeline is connected with the circulating pipeline on the right side of the first liquid storage tank through a three-way valve.
The waste heat recovery device for the photovoltaic power generation system is characterized in that a nano fluid working medium is arranged in the first liquid storage tank, the first liquid storage tank is insulated through a constant-temperature water bath, and the temperature is 25 ℃.
The utility model has the advantages that:
1) the experimental device effectively reduces the temperature of the surface of the photovoltaic power generation plate through the heat exchange between the working nanometer fluid and the surface of the photovoltaic plate. The electrical efficiency and the thermal efficiency of photovoltaic power generation are improved; the temperature of the battery pack is effectively reduced, the thermal stress loss caused by high temperature is reduced, and the service life of the photovoltaic power generation module is prolonged;
2) the experimental device exchanges heat between the latent heat energy obtained by heat exchange of the nano fluid and water flowing into the heat exchanger from the outside, the obtained hot water is used indoors, and the system performance is improved
Efficiency.
Drawings
FIG. 1 is an experimental schematic diagram of the present invention;
fig. 2 is a schematic structural view of the photovoltaic power generation panel of the present invention;
fig. 3 is a schematic view of a temperature measuring point on the surface of the photovoltaic panel of the present invention;
fig. 4 is a schematic structural view of a back heat exchange pipeline of the photovoltaic panel of the present invention;
fig. 5 is a three-dimensional structure diagram of the back heat exchange tube of the photovoltaic panel of the present invention;
FIG. 6 is a graph showing the relationship between the inlet velocity and the temperature change of the first heat exchanger according to the present invention;
FIG. 7 is a graph showing the relationship between the heat transfer coefficient of the surface of the heat exchange pipeline of the present invention;
in the figure: the system comprises a photovoltaic power generation panel 1, a first heat exchanger 2, a second thermocouple temperature measurement point 3, a second liquid pump 4, a second heat exchanger 5, a second liquid storage tank 6, a room 7, a three-way valve 8, a bypass valve 9, a first liquid storage tank 10, a first liquid pump 11, a stop valve 12, a flow meter 13 and a first thermocouple temperature measurement point 14.
Detailed Description
The invention is further described with reference to the accompanying drawings.
As shown in fig. 1 to 7, a waste heat recovery device of a photovoltaic power generation system includes a photovoltaic power generation panel 1, a first heat exchanger 2, a second thermocouple temperature measurement point 3, a second liquid pump 4, a second heat exchanger 5, a second liquid storage tank 6, a chamber 7, a three-way valve 8, a bypass valve 9, a first liquid storage tank 10, a first liquid pump 11, a stop valve 12, a flow meter 13, and a first thermocouple temperature measurement point 14.
The working principle is as follows:
in a circulation pipeline, a nanometer fluid working medium takes away a large amount of energy after passing through a first heat exchanger 2 arranged at the back of the photovoltaic power generation plate 1, so that the surface temperature of the photovoltaic power generation plate is reduced, and the power generation efficiency of the photovoltaic power generation plate 1 is improved; the nanofluid absorbing heat and increasing temperature by the first heat exchanger 2 exchanges heat with external water sent by a second liquid pump 4 in a second heat exchanger 5 through the second heat exchanger 5, and heat heating water is stored in a second liquid storage tank 6 and is used as domestic water for a room 7; the nanometer fluid exchanges heat in the second heat exchanger 5 and flows out to the first liquid storage tank 10 through the three-way valve 8. The cooled nanofluid is stored in the first liquid storage tank 10 at a constant temperature in the water area, so that the temperature of the nanofluid in the pipeline is reduced to the temperature T before entering the solar power generation panel0＝298.15K。
In the embodiment, a first heat exchanger 2, a second liquid pump 4, a first liquid pump 11, a first liquid storage tank 10, a flow meter 13 and a stop valve 12 are all arranged on a circulating pipeline; the photovoltaic power generation panel 1 is arranged on the back surface of the first heat exchanger 2, and the first thermocouple temperature measuring point 14 and the second thermocouple temperature measuring point 3 are respectively arranged on the circulating pipelines of the inlet and the outlet of the first heat exchanger 2 and used for measuring the temperature of the nanofluid at the inlet and the outlet of the first heat exchanger 2. A bypass pipeline is arranged on the circulating pipeline between the left side of the first liquid pump 11 and the right side of the first liquid storage tank 10, a bypass valve 9 is arranged on the bypass pipeline and used for balancing the pressure difference of a system pipeline and realizing the stable flow of the nano fluid in the pipeline, the bypass pipeline is connected with the circulating pipeline on the right side of the first liquid storage tank 10 through a three-way valve 8, a stop valve 12 between the first liquid pump 11 and the flowmeter 3 pipeline controls the on-off of the fluid in the pipeline, and effective experiment starting and stopping are realized through the three-way valve 8 and the stop valve 12. The second heat exchanger 5, the second liquid pump 4 and the second liquid storage tank 6 are all arranged on the water supply pipeline, and the water supply pipeline and the circulating pipeline are all connected to the second heat exchanger 5.
The heat exchanger tube material of the first heat exchanger 2 and the second heat exchanger 5 in this embodiment is copper (Cu).
In this embodiment, the nanofluid in the first reservoir 10 is silver nanofluid (Ag-H)2O) and the physical parameters are as follows: the silver nanofluid with the mass fraction of 5 percent has the density of 1467.7kg/m ^3, the specific heat capacity of 2768.2J/kg.K, the heat conductivity coefficient of 1.2461W/m.K and the dynamic viscosity of 0.000741 Pa.s.
In this embodiment, the flowmeter 13 is used for measuring the mass flow rate of the nanofluid flowing through the circulation pipeline, and the specifications of the flowmeter are as follows: the SY-9321BF type mass flowmeter has the medium pressure of 0-10Mpa, the working temperature of 0-45 ℃, the measurement flow range of 0-80slpm, the instantaneous flow display of 4 bits and the accumulative flow display of 6 bits.
In this embodiment, the specifications of the thermocouples for measuring the temperature at the first thermocouple temperature measuring point 14 and the second thermocouple temperature measuring node 3 are as follows: a PT100K type thermocouple, wherein the temperature sensor is made of polytetrafluoroethylene silver-plated wire, the temperature measurement precision is +/-0.1 and DEG C, and the temperature measurement range is-40-300 ℃; the first thermocouple temperature measuring point 14 measures the inlet temperature T of the nanofluid flowing into the first heat exchanger 2 through the pipeline by a thermocouple0. During the experiment, the flow meter 3 can set the mass flow rate flowing into the first heat exchanger 2 to be 30L/h, 60L/h and 90L/h respectivelyL/h, etc., then recording the temperature change of temperature measurement of the thermocouple in and out of the first heat exchanger 2, and adjusting the temperature change through the temperature value recorded by the thermocouple to ensure that the nanofluid flows into the inlet temperature T of the first heat exchanger 20Set at 25 deg.c as shown in fig. 6.
The structural parameters of the photovoltaic power generation panel 1 in this embodiment are: long L2670mm wide L1590mm, high H20 mm; the structural parameters of the back first heat exchanger 2 are as follows: the number of the coils is n-5; the outer diameter of the elbow: 2r259 mm; inner diameter of the elbow: 2r149 mm; tube spacing: l is398 mm; length of straight-line section pipe: l is4510mm as shown in fig. 4.
In the embodiment, the photovoltaic power generation panel 1 is composed of glass, an EVA (ethylene vinyl acetate) adhesive film, a battery piece, an EVA adhesive film, a nano fluid passing layer and a heat insulation cover plate in sequence; the surface of the photovoltaic power generation panel 1 is provided with 6 temperature measuring points, and the changes of the surface temperature of the photovoltaic panel in the experimental process are recorded by a thermocouple thermometer and are respectively recorded as T1,T2,T3,T4,T5,T6Reflecting the change in the relationship between the temperature and the thermal efficiency of the photovoltaic power generation panel 1, as shown in fig. 3.
The physical parameters of the nano fluid, such as density, heat conductivity coefficient, specific heat capacity and dynamic viscosity, are determined by the formula in the literature:
(1) density:
(2) dynamic viscosity
(3) Coefficient of thermal conductivity:
(4) specific heat capacity:
the Reynolds number is:
the heat transfer coefficient at the surface, h, is determined by the knoop number, h, expression: nu 0.023Re0.8Pr1/3(in turbulent conditions); nu ═ hDd/keff；Pr＝unfCp/keff(ii) a The following three formulas are used to obtain:
setting different values of the inlet velocity v, a value of h can be obtained. Compared with the COMSOL software numerical simulation result, the difference between the two groups of data can be seen as shown in FIG. 7, the effective heat transfer coefficient is continuously increased along with the increase of the inlet speed of the nano fluid coolant, and the error of the two groups of data is within 20 percent, so that the heat exchange tube surface effective heat transfer coefficient change value has a certain reference value.
The working process is as follows:
during system operation, a nano fluid working medium flows through an inlet of the first heat exchanger 2, a temperature value is obtained through measurement of the first thermocouple temperature measuring point 14, another temperature value is obtained through measurement of the second thermocouple temperature measuring point 3 at an outlet, and a corresponding thermal efficiency and temperature change curve chart is calculated through a formula.
The nanofluid heated in the first heat exchanger 2 exchanges heat with cooling water pumped into the second heat exchanger 5 by the second liquid pump 4 through the second heat exchanger 5, so that the temperature of the nanofluid is reduced on one hand, and the heated fluid is supplied to a room for indoor use on the other hand.
The nanofluid flowing out of the second heat exchanger 5 reaches the first liquid storage tank 10 through the three-way valve 8 of the main path, wherein the first liquid storage tank 10 is insulated through a thermostatic water bath, the temperature is 25 ℃, the nanofluid stored in the first liquid storage tank 10 is pumped to the first heat exchanger 2 on the back of the photovoltaic power generation panel 1 through the first liquid pump 11, and system circulation of the whole device is completed. One end of the three-way valve 8 is connected with a branch pipeline, a bypass valve 9 is arranged for balancing pipeline pressure difference, and the other end of the pipeline of the bypass valve 9 is connected to an outlet of the first liquid pump 11.
When the system is stopped, the pipeline stop valve 12 is closed, the second liquid pump 4 is closed, and then the first liquid pump 11 is closed, so that the nano fluid in the pipeline is recovered to the first liquid storage tank 10.
Claims (6)
1. The waste heat recovery device of the photovoltaic power generation system is characterized by comprising a first heat exchange system and a second heat exchange system which exchanges heat with the first heat exchange system, wherein the first heat exchange system comprises a photovoltaic power generation plate (1), a first heat exchanger (2), a first liquid storage tank (10), a first liquid pump (11) and a circulating pipeline, the first heat exchanger (2), the first liquid storage tank (10) and the first liquid pump (11) are all arranged on the circulating pipeline, and the first heat exchanger (2) is arranged on the back of the photovoltaic power generation plate (1); the second heat exchange system comprises a second heat exchanger (5), a second liquid pump (4), a second liquid storage tank (6) and a water supply pipeline, the second heat exchanger (5), the second liquid pump (4) and the second liquid storage tank (6) are all arranged on the water supply pipeline, and the water supply pipeline and the circulating pipeline are all connected to the second heat exchanger (5).
2. The waste heat recovery device of the photovoltaic power generation system is characterized in that a first thermocouple temperature measuring node (14) is arranged on the circulating pipeline at the inlet of the first heat exchanger (2), and a second thermocouple temperature measuring node (3) is arranged on the circulating pipeline at the outlet of the first heat exchanger (2).
3. The waste heat recovery device of the photovoltaic power generation system according to claim 2, wherein a stop valve (12) and a flow meter (13) are arranged on the circulation pipeline between the first thermocouple temperature measuring node (14) and the second liquid pump (4).
4. The waste heat recovery device of the photovoltaic power generation system is characterized in that a bypass pipeline is arranged on the circulation pipeline between the left side of the first liquid pump (11) and the right side of the first liquid storage tank (10), and a bypass valve (9) is arranged on the bypass pipeline.
5. The waste heat recovery device of the photovoltaic power generation system as claimed in claim 4, wherein the bypass pipeline is connected with the circulation pipeline on the right side of the first liquid storage tank (10) through a three-way valve (8).
6. The waste heat recovery device of the photovoltaic power generation system according to claim 4, wherein the first liquid storage tank (10) is filled with the nano fluid working medium, and the first liquid storage tank (10) is insulated by a thermostatic water bath, and the temperature is 25 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020106935.9U CN212109046U (en) | 2020-01-17 | 2020-01-17 | Waste heat recovery device of photovoltaic power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020106935.9U CN212109046U (en) | 2020-01-17 | 2020-01-17 | Waste heat recovery device of photovoltaic power generation system |
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| CN212109046U true CN212109046U (en) | 2020-12-08 |
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| CN202020106935.9U Expired - Fee Related CN212109046U (en) | 2020-01-17 | 2020-01-17 | Waste heat recovery device of photovoltaic power generation system |
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2020
- 2020-01-17 CN CN202020106935.9U patent/CN212109046U/en not_active Expired - Fee Related
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