GB2452754A - Method and apparatus for cooling a photovoltaic cell by means of a heat pump - Google Patents

Method and apparatus for cooling a photovoltaic cell by means of a heat pump Download PDF

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Publication number
GB2452754A
GB2452754A GB0717909A GB0717909A GB2452754A GB 2452754 A GB2452754 A GB 2452754A GB 0717909 A GB0717909 A GB 0717909A GB 0717909 A GB0717909 A GB 0717909A GB 2452754 A GB2452754 A GB 2452754A
Authority
GB
United Kingdom
Prior art keywords
heat
heat pump
heat exchange
circuit
photovoltaic cell
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.)
Withdrawn
Application number
GB0717909A
Other versions
GB0717909D0 (en
Inventor
Andrew Sheldon
David Christopher Atkins
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.)
ICE ENERGY HEAT PUMPS Ltd
Original Assignee
ICE ENERGY HEAT PUMPS 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 ICE ENERGY HEAT PUMPS Ltd filed Critical ICE ENERGY HEAT PUMPS Ltd
Priority to GB0717909A priority Critical patent/GB2452754A/en
Publication of GB0717909D0 publication Critical patent/GB0717909D0/en
Publication of GB2452754A publication Critical patent/GB2452754A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/06Heat pumps characterised by the source of low potential heat
    • 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
    • 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
    • H02S40/40Thermal components
    • H02S40/44Means to utilise heat energy, e.g. hybrid systems producing warm water and electricity at the same time
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F24F2005/0064Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
    • F24F2005/0067Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy with photovoltaic panels
    • 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
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/27Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/272Solar heating or cooling
    • Y02B10/12
    • 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
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/20Solar thermal
    • Y02B10/24
    • 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
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • 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
    • 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
    • Y02E10/60Thermal-PV hybrids

Abstract

The invention provides a method and apparatus for cooling a photovoltaic cell using a heat pump circuit and associated heat exchangers. The photovoltaic cell 'A', 'B', 'C', may be arranged in a solar panel array 14, and one of the heat exchangers may be in contact with the photovoltaic cell and form a serpentine pipe work layout (24 fig 2). The heat pump circuit may also include a heat pump 12 and a ground loop heat exchanger 13, and may use a water/glycol mixture as a heat transfer medium. A controller may also be included to regulate the heat pump circuit such that the photovoltaic cell is maintained at an optimum temperature for electrical generation. The invention may be included in a dwelling, and the photovoltaic cell may be mounted on a sloping roof.

Description

I
METHOD AND PROCESS FOR HEAT EXCHANGE
TECI-INICAL FIELD
This invention relates to method of, and apparatus for, heat exchange. In this case heat exchange is taken to be a process in which a heat pump is used to recover heat or dispense heat available at a first location in order to subsequently provide for heating or cooling at a second location. This is conveniently achieved by means of a heat transfer circuit linking the heat pump and the first and second locations.
BACKGROUND ART
A heat pump is a device, which moves heat energy from one place to another and from a lower to a higher temperature. An example of a heat pump is a domestic refrigerator in which heat is removed from the refrigerator contents and discharged to ambient air outside the refrigerator. A heat pump used in heating applications acts to remove heat from ambient air, water, soil or bedrock arid delivers to where it is needed. For cooling a reverse process can be used with heat being removed from a source to be discharged to ambient air, water, soil or rock.
Ambient air, water, soil or rock can be used to serve as a heat source. The outside heat :*** exchanger, often described as a collector, transfers energy to a circuit of working fluid
S
within the heat pump itself. A distribution system takes heat from the working fluid of ::: : the heat pump and distributes it within a building for example using under floor pipes, fan coil units, an air handling system, or wall-mounted radiators.
S....:
S S. * I. S **
A heat pump is known in which a working fluid is displaced around a refrigeration circuit containing four elements: evaporator, compressor, condenser and expansion valve. In such a heat pump the working fluid operates in a two phase cycle. In passing round the circuit the working fluid in the evaporator changes from a liquid to gas as heat is absorbed from the heat source. Following compression of the gas later in the cycle in the condenser working fluid changes from a gas to a liquid as heat while releasing heat where it is needed.
There are three main parts to a heat pump system: 1. A heat source and the means of extracting heat, 2. The circuit of working fluid within the heat pump itself and a power source, 3. A heat sink to deliver the energy in the required form.
The heat source can be the ambient air, water, soil or rock. The outside heat exchanger (the collector) transfers heat energy to the circuit of working fluid within the heat pump itself. It is preferable, in terms of maximising efficiency, to have constant temperature differences between (a) the source and the working fluid and (b) the working fluid and the sink, though this may not be possible in some heat pump models. It is also preferable to have as high as possible a source temperature, and as low as possible sink temperature.
It is necessary to include a power supply to the compressor to drive the heat pump. It is usually an electric motor which drives the compressor, but a gas engine is used in *S*.
*... somedesigns. * . .
DISCLOSURE OF INVENTION S..
According to a first aspect of the present invention there is provided a method of heat S exchange by means of a heat pump incorporating circuitry for a heat exchange : medium between a first location having means to be cooled by means of the circuit and a second location having a heat sink to which heat can be rejected by means of the circuit; characterised in that the means to be cooled includes at least one photo-voltaic cell.
According to a first preferred version of the first aspect of the present invention the means to be cooled are regulated by control means for the heat pump so that the temperature of the photo-voltaic cell is maintained by means of the circuit at an optimal level for electrical generation.
According to a second aspect of the present invention there is provided apparatus for heat exchange incorporating a heat pump comprising: a first circuit for heat exchange medium coupled in a good heat exchange relationship with a means to be cooled including at least one photo-voltaic cell; a second circuit for the heat exchange medium adapted for coupling into good heat exchange relationship coupled in a good heat exchange relationship with a heat sink to provide for heat to be rejected from the second circuit to the heat sink; means coupling the first circuit to the second so that heat exchange is established between the means to be cooled and the heat sink; and control means for regulating temperature of means to be cooled.
** According to a third aspect of the present invention there is provided a dwelling * * I incorporating means adapted for heat exchange by the method of the first aspect or the *::: : first preferred version thereof.
I I..
I
According to a fourth aspect of the present invention there is provided a dwelling I. incorporating means adapted for heat exchange by the apparatus of the second aspect.
BRIEF DESCRIPTION OF DRAWINGS
An exemplary embodiment of the invention will now be described with reference to the accompanying drawings of a heat engine unit of which: Figure 1 is a diagrammatic view of the unit; and Figure 2 is a diagrammatic view of a part of Figure 1 shown on a larger scale.
MODE FOR CARRYING OUT THE INVENTION
Figure 1 shows a unit comprising three major components made up of: heat pump 12, ground loop 13 arid solar panel array 14.
These are linked into a circuit, as will be described hereafter, by a network of pipes (including pipes 13A, 13B, 14A, 14B). The circuit further includes an expansion tank 15 located at a height greater than that of the solar panel array 14.
Heat pump containment 16 houses a compressor operated so as to cause a water/glycol heat exchange medium to pass firstly expansion valve and then through the heat pump evaporator, which cools the medium below ground ambient temperature and then round the pipe network. The mixture passes by way of pipe 13A through ground loop 13 whose coils are buried in ground adjacent the heat pump 12. I..
The passing medium is heated as it passes through the ground loopl3 which is further *:::: heated subsequently in the heat pump circuit.
Turning now to solar panel array 14. This comprises photovoltaic (PV) panels A, B and I.e,.1 C mounted (as shown in more detail in Figure 2) on a sloping roof 20.
The roof 20 includes conventional roof battens 21 which are shown partially covered by tiles 22. Figure 2 shows solar panel B. made up of voltaic members 23 seated in good heat exchange contact with serpentine pipe work 24 incorporated in pipe 14A.
The remaining panels A and C are mounted in a similar manner for heat exchange with medium circulated by way of pipe 14A.
Broadly the panels A, B C are devices which generate electricity from ambient light.
The panels A, B and C absorb heat as well as light and even though the surrounding air temperature may be only 20°C it has been found that an operating temperature of a panel can rise to between 50 -70°C. The electrical generating efficiency of a panel loses efficiency as it runs hotter with a consequent reduction in electrical output. This can result in practice in a need for a larger (and so more expensive) array of panels to achieve a required electrical output than is theoretically necessary.
The present invention provides for cooled heat exchange medium to be circulated to withdraw heat from the photovoltaic members 23 and input heat to the corresponding members of panels A and B. This is achieved by using cooled water/glycol mixture, referred to earlier, in the heat pump cooled by passage through ground loop 13 to exchange heat with, and so reduce the temperature of, the PV panels A, B and C. *:::. Preliminary tests with a simple cooling system have shown that a reduction in panel * **:* operating temperature from approximately 55°C to 25 °C can be obtained with a * *:. simple cooling arrangement. This could be expected to yield a 10-15% improvement in the output of the PV array. * * S **
Cooling the photovoltaic panels A, B and C in this way would increase the temperature of the water/glycol mixture returning by way of the pipe circuit to the ground loop 13 and so increase the heat pump's Coefficient of Performance (CoP') -that is to say the ratio of the electricity supplied to the heat pump to the heat produced by the heat pump. Each degree Celsius rise in ground loop temperature could be expected to result in a CoP improvement of 2-3%. Consequently a 10% improvement in ground source heat pump efficiency could be achieved.
The application of this invention provides a double benefit when considering the overall performance of the building's energy generation. The two efficiency improvements are obtained with minimal increase in running costs. The whole arrangement being mutually beneficial to each subsystem.
The invention is particularly applicable to domestic dwellings but is readily applicable to other accommodation such as for office, commercial and public buildings.
The invention provides a novel combination of components whish are individually either already available or readily fabricated. it is particularly applicable to new construction. However it is also capable of incorporation into existing buildings. S. * I * *** S... * * ** a... * . S S. * S..
S
* 5.*. * . S* S S S * S *S

Claims (8)

  1. I A method of heat exchange by means of a heat pump incorporating circuitry for a heat exchange medium between a first location having means to be cooled by means of the circuit and a second location having a heat sink to which heat can be rejected by means of the circuit; characterised in that the means to be cooled includes at least one photo-voltaic cell.
  2. 2 A method of heat exchange as claimed iii Claim 1 providing for the means to be cooled to be regulated by control means for the heat pump so that the temperature of the photo-voltaic cell is maintained by means of the circuit at an optimal level for electrical generation.
  3. 3 Apparatus for heat exchange comprising a heat pump comprising: a first circuit for heat exchange medium coupled in a good heat exchange relationship with a means to be cooled including at least one photo-voltaic cell; a second circuit for the heat exchange medium adapted for coupling into good heat exchange relationship coupled in a good heat exchange relationship with a heat sink to provide for heat to be rejected from the second circuit to the heat sink; means coupling the first circuit to the second so that heat exchange is established between the means to be cooled and the heat sink; and S...
    * .** control means for regulating temperature of means to be cooled. * S S S. I
    *:.
  4. 4 A method as hereinbefore described with reference to Figures 1 and 2 of the * accompanying drawings.
  5. *SU..S * I S. S * I I * I. Apparatus as hereinbefore described with reference to the accompanying drawings.
  6. 6 A dwelling adapted for heat exchange by the method of Claim 1. 2 or 4.
  7. 7 A dwelling adapted for heat exchange by the apparatus of Claim 3 or 5.
  8. S. * * * S.. S... * . S... S... * S* *5 S
    I S..
    I
    S. **SS * S *S S
    S S S *S
GB0717909A 2007-09-14 2007-09-14 Method and apparatus for cooling a photovoltaic cell by means of a heat pump Withdrawn GB2452754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0717909A GB2452754A (en) 2007-09-14 2007-09-14 Method and apparatus for cooling a photovoltaic cell by means of a heat pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0717909A GB2452754A (en) 2007-09-14 2007-09-14 Method and apparatus for cooling a photovoltaic cell by means of a heat pump

Publications (2)

Publication Number Publication Date
GB0717909D0 GB0717909D0 (en) 2007-10-24
GB2452754A true GB2452754A (en) 2009-03-18

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Family Applications (1)

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Country Status (1)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2944984A1 (en) * 2009-04-29 2010-11-05 Marc Dabrigeon Method and device for manufacturing a serpentine
WO2011047484A1 (en) * 2009-10-22 2011-04-28 Renewable Resource Recovery Corp. Wall assembly with photovoltaic panel
CN102635980A (en) * 2012-05-07 2012-08-15 上海理工大学 Solar photovoltaic heat pump system
WO2013183002A2 (en) 2012-06-05 2013-12-12 Michal Masaryk System and method of cooling of photovoltaic panel and method of installation of system
CN105928115A (en) * 2016-06-21 2016-09-07 宝莲华新能源技术(上海)有限公司 Geothermal air conditioning system capable of compensating superficial layer geotherm under working condition of heat imbalance
US9509249B2 (en) 2012-06-05 2016-11-29 Michal Masaryk System and method of cooling of photovoltaic panel and method of installation of system
CN108954913A (en) * 2018-06-14 2018-12-07 山东新华联智能光伏有限公司 Photovoltaic runs heating system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19604356A1 (en) * 1996-02-07 1997-08-14 Lorenz Gerd Heat recovery from solar energy by thermal absorber in closed circuit
DE10144148A1 (en) * 2001-09-07 2003-04-03 Hake Thomas Solar energy device comprises a photovolatic solar module arranged on the side of the building facing the sun, a heat exchanger connected to the module via lines, and a control and regulating device
JP2006183933A (en) * 2004-12-27 2006-07-13 Sanyo Electric Co Ltd Photovoltaic system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19604356A1 (en) * 1996-02-07 1997-08-14 Lorenz Gerd Heat recovery from solar energy by thermal absorber in closed circuit
DE10144148A1 (en) * 2001-09-07 2003-04-03 Hake Thomas Solar energy device comprises a photovolatic solar module arranged on the side of the building facing the sun, a heat exchanger connected to the module via lines, and a control and regulating device
JP2006183933A (en) * 2004-12-27 2006-07-13 Sanyo Electric Co Ltd Photovoltaic system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2944984A1 (en) * 2009-04-29 2010-11-05 Marc Dabrigeon Method and device for manufacturing a serpentine
EP2248613A1 (en) * 2009-04-29 2010-11-10 Dabrigeon, Mark Method and apparatus for manufacturing a serpentine
WO2011047484A1 (en) * 2009-10-22 2011-04-28 Renewable Resource Recovery Corp. Wall assembly with photovoltaic panel
EP2491596A4 (en) * 2009-10-22 2015-12-09 Renewable Resource Recovery Corp Wall assembly with photovoltaic panel
CN102635980A (en) * 2012-05-07 2012-08-15 上海理工大学 Solar photovoltaic heat pump system
CN102635980B (en) * 2012-05-07 2014-03-26 上海理工大学 Solar photovoltaic heat pump system
WO2013183002A2 (en) 2012-06-05 2013-12-12 Michal Masaryk System and method of cooling of photovoltaic panel and method of installation of system
US9509249B2 (en) 2012-06-05 2016-11-29 Michal Masaryk System and method of cooling of photovoltaic panel and method of installation of system
CN105928115A (en) * 2016-06-21 2016-09-07 宝莲华新能源技术(上海)有限公司 Geothermal air conditioning system capable of compensating superficial layer geotherm under working condition of heat imbalance
CN108954913A (en) * 2018-06-14 2018-12-07 山东新华联智能光伏有限公司 Photovoltaic runs heating system

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