CN114646151A - Combined cooling heating and power PVT direct-current heat pump system and operation method - Google Patents
Combined cooling heating and power PVT direct-current heat pump system and operation method Download PDFInfo
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- CN114646151A CN114646151A CN202210217943.4A CN202210217943A CN114646151A CN 114646151 A CN114646151 A CN 114646151A CN 202210217943 A CN202210217943 A CN 202210217943A CN 114646151 A CN114646151 A CN 114646151A
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- 238000004321 preservation Methods 0.000 claims abstract description 14
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- 206010015856 Extrasystoles Diseases 0.000 claims abstract description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 239000007798 antifreeze agent Substances 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
Abstract
The invention relates to a cold and hot electricity PVT direct current heat pump trigeminy supplies system, including: the heat and cold combined supply PVT direct-current heat pump system comprises a plate evaporator, an outdoor air-cooled evaporator, an indoor air-cooled evaporator, a direct-current variable-frequency compressor, a condenser and a heat preservation water tank; the direct-current variable-frequency compressor and the condenser are connected to form a main path, and the plate evaporator, the outdoor air-cooled evaporator and the indoor air-cooled evaporator are respectively connected with the main path in series to form a first heat pump working medium loop, a second heat pump working medium loop and a third heat pump working medium loop; the solar photovoltaic photo-thermal system comprises a photovoltaic module heat collector; the plate-type evaporator is connected with the heat exchange medium side of the photovoltaic module heat collector in series to form a medium loop. The operating method is characterized in that the on-off of the medium loop and the heat pump working medium loop is controlled by judging the temperature difference between the heat exchange medium temperature of the photovoltaic module heat collector and the ambient temperature. The invention utilizes the solar energy and air energy to operate and improve the performance, and simultaneously solves the domestic hot water requirement, the cold quantity requirement and the electricity utilization requirement of a low-power electric appliance.
Description
Technical Field
The invention relates to the technical field of heat pump hot water production, in particular to a cold-heat-electricity PVT direct-current heat pump triple supply system and an operation method.
Background
An air source heat pump is an energy-saving device which utilizes high-level energy to transfer heat from low-level heat source air to a high-level heat source. The technical performance of the air source heat pump mainly depends on the temperature of air in the environment and the heat exchange efficiency of the system, and the air source heat pump can generally have two modes of refrigeration and heating through a four-way reversing valve. The main advantages of air source heat pump technology are represented by: the air source is convenient and easy to obtain, and is inexhaustible; a cooling water system is not needed, and the installation and the use are simple; no pollution to the environment. But the system performance is greatly influenced by the ambient temperature and the high-level energy, namely electric energy, is relied on to drive the heat pump.
The solar photovoltaic power generation technology is based on the principle of photovoltaic effect, and solar energy is directly converted into electric energy by using a solar cell. The electric energy generated by the solar cell can be used independently or used in a grid-connected mode for power generation, and the whole process has the advantages of being energy-saving, environment-friendly, good in economical efficiency and the like. The solar photovoltaic power generation technology depends on the solar illumination condition, so the solar photovoltaic power generation technology is generally required to be used outdoors. On the basis, the solar photovoltaic photo-thermal comprehensive utilization technology (PVT) can collect solar thermal energy while utilizing solar energy to generate electricity, and further improves the utilization efficiency of the solar energy. The method for producing hot water by utilizing solar energy is a convenient and convenient method.
The invention patent with publication number CN 201721042232.9 discloses a combined cooling and heating device driven by natural gas, which can be used for combined cooling and heating, but the system needs to burn natural gas when supplying heat, has obviously high operation cost, generates greenhouse gas, and is not energy-saving and environment-friendly. In addition, the system is suitable for indoor use and is not convenient for outdoor use.
In summary, there is a need for a combined cooling, heating and power system that can supply power and hot water, has good cooling effect, good energy saving performance, good economy, good practicability and no pollution, and can meet the needs of outdoor personnel on electricity consumption, cold capacity and domestic hot water.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a cold-heat-electricity PVT direct-current heat pump triple supply system and an operation method thereof, aiming at ensuring that the system can meet the requirements of users under various environmental working conditions and improving the flexibility and the reliability of a hot water system.
The technical scheme adopted by the invention is as follows:
a cold and hot electricity PVT direct current heat pump trigeminy supplies system includes:
the cold and hot combined supply PVT direct-current heat pump system comprises a plate evaporator, an outdoor air-cooled evaporator, an indoor air-cooled evaporator, a direct-current variable-frequency compressor, a condenser and a heat preservation water tank; the direct-current variable-frequency compressor and the condenser are connected to form a main path, the plate-type evaporator and the main path are connected in series to form a first heat pump working medium loop, the outdoor air-cooled evaporator and the main path are connected in series to form a second heat pump working medium loop, and the indoor air-cooled evaporator and the main path are connected in series to form a third heat pump working medium loop; the condenser is used for supplying heat to the heat-preservation water tank;
the solar photovoltaic photo-thermal system comprises a photovoltaic module heat collector; the plate-type evaporator is connected with the heat exchange medium side of the photovoltaic module heat collector in series to form a medium loop; the solar photovoltaic photo-thermal system provides direct current for the cold and heat co-supply PVT direct current heat pump system;
the control module controls the on-off of the first heat pump working medium loop, the second heat pump working medium loop and the medium loop by judging the temperature difference between the heat exchange medium temperature of the photovoltaic assembly heat collector and the environment temperature.
The further technical scheme is as follows:
the solar photovoltaic photo-thermal system further comprises a controller, a storage battery and an inverter, wherein the controller is used for controlling the electric connection between the power transmission side of the photovoltaic module heat collector and the storage battery, between the power transmission side of the photovoltaic module heat collector and the inverter and between the storage battery and the electric load of the cold and hot co-supply PVT direct current heat pump system.
An expansion valve and an inlet valve are arranged at the inlet end of the working medium side of the plate-type evaporator heat pump, and an outlet valve is arranged at the outlet end; an expansion valve and an inlet valve are arranged at the inlet end of the working medium side of the heat pump of the outdoor air-cooled evaporator, and an outlet valve is arranged at the outlet end of the working medium side of the heat pump of the outdoor air-cooled evaporator; an expansion valve and an inlet valve are arranged at the inlet end of the working medium side of the heat pump of the indoor air-cooled evaporator, and an outlet valve is arranged at the outlet end of the working medium side of the heat pump.
And the side inlet end and the outlet end of the heat exchange medium of the plate-type evaporator are respectively provided with a control valve.
And the outlet end of the heat exchange medium side of the photovoltaic module heat collector is connected with the constant-pressure water tank and the first direct-current water pump in series.
The condenser and the heat preservation water tank are connected to form a water loop, a second direct-current water pump is arranged on the water loop, and the second direct-current water pump is powered by the solar photovoltaic photo-thermal system.
The heat exchange medium side of photovoltaic module heat collector and all be equipped with temperature-detecting element in the heat preservation water tank, control module with temperature-detecting element connects.
An operation method of the combined cooling, heating and power PVT direct-current heat pump system comprises the following steps:
in the hot water making mode, the following control is carried out:
when the temperature difference between the heat exchange medium temperature of the photovoltaic module heat collector and the environment temperature is greater than or equal to T1, the medium loop is controlled to be opened, the first heat pump working medium loop is kept communicated, and the second heat pump working medium loop is cut off, namely, the single solar heat source working mode is started;
when the temperature difference between the heat exchange medium temperature of the photovoltaic module heat collector and the environment temperature is smaller than T1 and is larger than or equal to T2, the medium loop is controlled to be opened, the first heat pump working medium loop and the second heat pump working medium loop are kept communicated, and the double-heat-source working mode is started;
when the temperature difference between the heat exchange medium temperature of the photovoltaic module heat collector and the environment temperature is smaller than T2, the medium loop is controlled to be cut off, the first heat pump working medium loop is kept to be cut off, the second heat pump working medium loop is kept to be opened, and the single air source heat source working mode is started.
The further technical scheme is as follows:
and the third heat pump working medium loop is opened in a refrigeration mode.
The invention has the following beneficial effects:
the solar energy and air energy dual-heat-source water heater improves the performance by utilizing the operation of solar energy and air energy, and simultaneously solves the domestic hot water requirement and cold energy requirement of outdoor personnel and the electricity utilization requirement of a low-power electric appliance. The invention has the following advantages:
1. the energy-saving performance is good: the whole set of system is driven by electricity generated by the solar cell without additional electric energy supplement, and the system supplies power to other electric equipment by using renewable energy solar energy without consuming electric energy of a power grid, so that energy is saved.
2. The loss is less: the photovoltaic direct-drive heat pump can be directly driven by electricity generated by the solar photovoltaic assembly, and the intermediate inversion loss is reduced. The electric energy generated by the solar photovoltaic is used for directly supplying power to the whole system, and the power consumption requirement of the outdoor life low-power electric appliance can be met.
3. The reliability is high: the system uses double heat sources, and the stability is improved by various operation modes.
4. The application range is wide: the off-grid operation can be realized through solar photovoltaic power generation, and the transfer is convenient, so that the solar photovoltaic power generation device can be used for various working scenes and is convenient to use.
5. The method is environment-friendly: the whole system fully utilizes clean energy sources such as solar energy and air energy, does not need any fossil energy, and is very environment-friendly.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure: 1. a photovoltaic module heat collector; 2. a constant pressure water tank; 3. a first direct current water pump; 4. a plate evaporator; 5. a first electronic expansion valve; 6. an outdoor air-cooled evaporator; 7. a second electronic expansion valve; 8. indoor air-cooled evaporator; 9. a third electronic expansion valve; 10. a direct current variable frequency compressor; 11. a condenser; 12. a second direct-current water pump; 13. a heat preservation water tank; 14. a controller; 15. a battery; 16. an inverter; 17. a first valve; 18. a second valve; 19. a fifth valve; 20. a sixth valve; 21. a valve seventh; 22. a valve eighth; 23. a third valve; 24. and a valve IV.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
A PVT direct-current heat pump triple supply system of this embodiment, as shown in fig. 1, includes:
the cold and hot combined PVT direct-current heat pump system comprises a plate evaporator 4, an outdoor air-cooled evaporator 6, an indoor air-cooled evaporator 8, a direct-current variable-frequency compressor 10, a condenser 11 and a heat-preservation water tank 13; the direct-current variable-frequency compressor 10 and the condenser 11 are connected to form a main path, the plate-type evaporator 4 and the main path are connected in series to form a first heat pump working medium loop, the outdoor air-cooled evaporator 6 and the main path are connected in series to form a second heat pump working medium loop, the indoor air-cooled evaporator 8 and the main path are connected in series to form a third heat pump working medium loop, and the plate-type evaporator 4, the outdoor air-cooled evaporator 6 and the indoor air-cooled evaporator 8 are connected in parallel; wherein, the condenser 11 is used for supplying heat for the heat preservation water tank 13;
the solar photovoltaic photo-thermal system comprises a photovoltaic module heat collector 1; the plate-type evaporator 4 is connected with the heat exchange medium side of the photovoltaic assembly heat collector 1 in series to form a medium loop.
Those skilled in the art will appreciate that the necessary control valves are provided on each circuit in order to perform the function of the circuit.
The solar photovoltaic photo-thermal system provides direct current for the cold and hot co-supply PVT direct current heat pump system;
the control module controls the on-off of the first heat pump working medium loop, the second heat pump working medium loop and the medium loop by judging the temperature difference between the heat exchange medium temperature of the photovoltaic assembly heat collector 1 and the environment temperature.
Specifically, the photovoltaic module heat collector 1 has a heat exchange medium side and a power transmission side, and the heat exchange medium side is used for outputting the collected solar heat energy and exchanging heat with the plate-type evaporator 4. The power transmission side outputs electric energy to supply power to a cold-hot co-supply PVT direct current heat pump system (a direct current variable frequency compressor 10, a loop valve assembly and the like).
Specifically, the photovoltaic module heat collector 1 is composed of a photovoltaic module and a back heat collector. The back heat collector comprises a pipeline, a mixed working medium of water and an antifreeze agent and a heat insulation material. The pipeline has small heat conduction resistance, is beneficial to heat transfer, and can be made of copper materials with large heat conduction coefficients. The mixed working medium of water and antifreeze has good heat conduction property and simultaneously reduces the freezing point of the working medium. The heat insulating material is a material having a thermal coefficient of 0.12 or less.
Specifically, the solar photovoltaic photo-thermal system further comprises a controller 14, a storage battery 15 and an inverter 16, wherein the controller 14 is used for controlling the electric connection between the power transmission side of the photovoltaic module heat collector 1 and the storage battery 15, between the power transmission side of the photovoltaic module heat collector 1 and the inverter 16, and between the storage battery 15 and the system electric load.
Specifically, the storage battery is one of a lead-acid maintenance-free storage battery, a common lead-acid storage battery and an alkaline nickel-cadmium storage battery.
The solar power generation system of the embodiment utilizes the photovoltaic effect to provide electric energy for the whole combined cooling and heating PVT direct current heat pump system on one hand, and to supply power for a low-power alternating current appliance through conversion of the inverter 16 on the other hand.
The controller 14 controls power transmission and distribution among the photovoltaic module heat collector 1, the storage battery 15, and the inverter 16. When the storage battery 15 is in a saturated state, the controller 14 disconnects the power transmission side of the photovoltaic module heat collector 1 from the storage battery 15; when the storage battery 15 does not reach the saturation state, the controller 14 opens the connection between the power transmission side of the photovoltaic module heat collector 1 and the storage battery 15; when the load side needs to use electricity, the controller 14 is connected with the power transmission side of the photovoltaic module heat collector 1 and the cold and hot co-supply PVT direct-current heat pump system or the inverter 16; when the load side needs electricity, no solar energy or insufficient solar energy is available, the controller 14 controls the storage battery 15 to be connected with the cold and hot co-supply PVT direct current heat pump system or the inverter 16. The controller 14 also has a manually controlled switch.
Specifically, in a medium loop formed by connecting the plate-type evaporator 4 and the heat exchange medium side of the photovoltaic module heat collector 1 in series, the outlet end of the heat exchange medium side of the photovoltaic module heat collector 1 is connected with the constant-pressure water tank 2 and the first straight-flow water pump 3 in series. The constant pressure water tank 2 is used for supplementing water. The first direct current pump 3 may also be powered by a solar photovoltaic photo-thermal system. In the medium loop, a first valve 17 and a second valve 18 are respectively arranged at the inlet end and the outlet end of the plate-type evaporator 4.
During operation, the photovoltaic module heat collector 1 is placed in a place with sufficient outdoor illumination, the controller 14 and the first direct current pump 3 are turned on, the photovoltaic module heat collector 1 absorbs solar energy and converts the solar energy into electric energy which is stored in the storage battery 15 through an electric wire, and the storage battery 15 supplies power for the heating water system and can provide electric energy for other low-power alternating current electric equipment through the inverter 16.
Specifically, the condenser 11 and the heat preservation water tank 13 are connected to form a water loop, a second direct-current water pump 12 is arranged on the water loop, and the second direct-current water pump 12 can be powered by a solar photovoltaic photo-thermal system.
The inlet end of the heat pump working medium side of the plate evaporator 4 is provided with a first electronic expansion valve 5 and a valve six 20, and the outlet end is provided with a valve five 19; the inlet end of the heat pump working medium side of the outdoor air-cooled evaporator 6 is provided with a second electronic expansion valve 7 and a valve eight 22, and the outlet end is provided with a valve seven 21; the inlet end of the heat pump working medium side of the indoor air-cooled evaporator 8 is provided with a third electronic expansion valve 9 and a fourth valve 24, and the outlet end is provided with a third valve 23.
The five valve 19, the plate evaporator 4, the first electronic expansion valve 5 and the six valve 20 are connected in series, the seven valve 21, the outdoor air-cooled evaporator 6, the second electronic expansion valve 7 and the eight valve 22 are connected in series, the three valve 23, the indoor air-cooled evaporator 8, the third electronic expansion valve 9 and the four valve 24 are connected in series, the three series paths are connected in parallel, and are connected in series with the direct-current variable-frequency compressor 10 and then connected in series with the condenser 11 to form a heat pump loop. The whole system is supplied with direct current.
Specifically, the condenser 11 is a double pipe condenser.
Specifically, the working medium of the heat pump can adopt a non-azeotropic working medium.
In operation, the heat pump system may be placed outdoors and the condenser 11 transfers heat to the water to be heated in the holding tank 13. The controller 14 is connected with the heat pump system and controls the direct-current variable-frequency compressor 10 through the direct-current driving module.
Specifically, the heat exchange medium side of the photovoltaic module heat collector 1 and the heat preservation water tank 13 are respectively provided with a temperature detection element, and the control module is connected with the temperature detection element.
The operation method of the PVT direct-current heat pump triple supply system of the embodiment includes:
when the temperature difference between the heat exchange medium temperature of the photovoltaic component heat collector 1 and the ambient temperature is greater than or equal to T1, the medium loop is kept open, that is, the photovoltaic component heat collector 1 supplies heat energy to the heat pump hot water system through the plate-type evaporator 4. And controlling the valve five 19 and the valve six 20 to be opened, and simultaneously controlling the valve eight 22 and the valve seven 21 to be closed, namely, the first heat pump working medium loop is communicated, the second heat pump working medium loop is cut off, and the single solar heat source working mode is kept;
as can be understood by those skilled in the art, the thermal power of the photovoltaic module heat collector 1 under the working condition is high, and the hot water requirement of a user can be met through a single solar heat source working mode.
When the temperature difference between the heat exchange medium temperature of the photovoltaic assembly heat collector 1 and the environment temperature is less than T1 and is more than or equal to T2, the medium loop is kept smooth, the first heat pump working medium loop is kept communicated, meanwhile, the second heat pump working medium loop is communicated, namely, a double-heat-source working mode is started;
in the working process, the working medium of the heat pump is changed into high-temperature and high-pressure steam after passing through the direct-current variable-frequency compressor 10, and then the high-temperature and high-pressure steam transfers heat to a water tank in the condenser 11. Then the mixture enters a first electronic expansion valve 5 and a second electronic expansion valve 7 respectively, and then is evaporated and absorbs heat at different evaporation temperatures in a plate evaporator 4 and an outdoor air-cooled evaporator 6 respectively. Then the two flows of working media are mixed and enter the direct current variable frequency compressor 10.
Those skilled in the art will appreciate that the thermal power of the photovoltaic module heat collector 1 is not high in this condition, so that the dual heat source operation mode needs to be started to meet the hot water demand of the user.
When the temperature difference between the heat exchange medium temperature of the photovoltaic assembly heat collector 1 and the environment temperature is smaller than T2, the medium loop is controlled to be cut off, the first heat pump working medium loop is controlled to be cut off, the second heat pump working medium loop is controlled to be opened, and the single air source heat source working mode is started.
Those skilled in the art will appreciate that the thermal power of the photovoltaic module heat collector 1 is low under this condition, for example, in cloudy days or at night, and therefore, the hot water demand of the user can be satisfied only by the single air source heat source working mode.
Those skilled in the art will appreciate that T1 is greater than T2, and the specific value is set according to actual operating requirements.
In the operation method of the PVT direct current heat pump triple co-generation system, the third heat pump working medium loop is opened in the refrigeration mode.
Specifically, when the user turns on the cooling function using the remote control function, the control command has the highest priority. And (3) starting the heat pump, opening a valve IV 24 and a valve III 23, and starting the indoor air-cooled evaporator 8 to work, namely, the third medium loop is communicated to provide cold energy indoors.
Specifically, by judging the temperature difference between the heat exchange medium temperature of the photovoltaic module heat collector 1 and the ambient temperature, at least one of the branch where the solar panel evaporator 4 is located and the outdoor air evaporator 6 is controlled to be in a passage, so that solar energy is used as a heat source and an air source is used as a heat source of the solar photovoltaic photo-thermal system, and at least one of the solar heat absorbed by the photovoltaic module heat collector 1 and the air heat absorbed by the outdoor air evaporator 6 is used for heating the heat preservation water tank 13. The opening and closing of the indoor evaporator 8 are controlled by manual remote control of a user.
This application satisfies hot water demand under the different service environment temperature conditions through two heat pump return circuits, possesses system refrigeration, electric power supply function simultaneously to have advantages such as energy-conservation nature is good, the system is practical, dependable performance, economic nature are good, can satisfy outdoor middle-size and small-size system hot water needs.
The above-described embodiments are preferred examples of the present invention, and the present invention is not limited thereto. Any other changes or equivalent substitutions without departing from the technical scope of the invention are included in the protection scope of the invention.
Claims (9)
1. The utility model provides a cold and hot electricity PVT direct current heat pump trigeminy supplies system which characterized in that includes:
the cold and heat combined supply PVT direct-current heat pump system comprises a plate evaporator (4), an outdoor air-cooled evaporator (6), an indoor air-cooled evaporator (8), a direct-current variable-frequency compressor (10), a condenser (11) and a heat-preservation water tank (13); the direct-current variable-frequency compressor (10) and the condenser (11) are connected to form a main path, the plate-type evaporator (4) and the main path are connected in series to form a first heat pump working medium loop, the outdoor air-cooled evaporator (6) and the main path are connected in series to form a second heat pump working medium loop, and the indoor air-cooled evaporator (8) and the main path are connected in series to form a third heat pump working medium loop; the condenser (11) is used for supplying heat to the heat-preservation water tank (13);
the solar photovoltaic photo-thermal system comprises a photovoltaic module heat collector (1); the plate-type evaporator (4) is connected with the heat exchange medium side of the photovoltaic module heat collector (1) in series to form a medium loop; the solar photovoltaic photo-thermal system provides direct current for the cold and heat co-generation PVT direct current heat pump system;
the control module controls the on-off of the first heat pump working medium loop, the second heat pump working medium loop and the medium loop by judging the temperature difference between the heat exchange medium temperature of the photovoltaic assembly heat collector (1) and the ambient temperature.
2. The combined cooling, heating and power PVT direct current heat pump system as claimed in claim 1, wherein the solar photovoltaic photo-thermal system further comprises a controller (14), a storage battery (15) and an inverter (16), the controller (14) is used for controlling the electric connection between the power transmission side of the photovoltaic module heat collector (1) and the storage battery (15), between the inverter (16) and between the storage battery (15) and the electric load of the combined cooling, heating and power PVT direct current heat pump system.
3. The combined cooling, heating and power PVT direct-current heat pump system as claimed in claim 1, wherein an expansion valve and an inlet valve are arranged at the inlet end of the heat pump working medium side of the plate evaporator (4), and an outlet valve is arranged at the outlet end; an expansion valve and an inlet valve are arranged at the inlet end of the working medium side of the heat pump of the outdoor air-cooled evaporator (6), and an outlet valve is arranged at the outlet end; an expansion valve and an inlet valve are arranged at the inlet end of the working medium side of the heat pump of the indoor air-cooled evaporator (8), and an outlet valve is arranged at the outlet end.
4. The combined cooling, heating and PVT direct current heat pump system of claim 1, wherein the plate evaporator (4) has control valves at the inlet and outlet of the heat transfer medium.
5. The combined cooling, heating and power PVT direct-current heat pump system as claimed in claim 1, wherein the outlet end of the heat exchange medium side of the photovoltaic module heat collector (1) is connected in series with the constant-pressure water tank (2) and the first direct-current water pump (3).
6. The combined cooling, heating and power PVT direct current heat pump system as claimed in claim 1, wherein the condenser (11) and the holding water tank (13) are connected to form a water loop, a second direct current water pump (12) is arranged on the water loop, and the second direct current water pump (12) is powered by the solar photovoltaic photo-thermal system.
7. The combined cooling, heating and power PVT direct current heat pump system as claimed in claim 1, wherein the heat exchange medium side of the photovoltaic module heat collector (1) and the heat preservation water tank (13) are both provided with temperature detection elements, and the control module is connected with the temperature detection elements.
8. A method for operating a combined cooling, heating and PVT direct current heat pump system as claimed in claim 1, comprising:
in the hot water making mode, the following control is carried out:
when the temperature difference between the heat exchange medium temperature of the photovoltaic module heat collector (1) and the environment temperature is greater than or equal to T1, a medium loop is controlled to be opened, the first heat pump working medium loop is kept communicated, and the second heat pump working medium loop is cut off, namely, a single solar heat source working mode is started;
when the temperature difference between the heat exchange medium temperature of the photovoltaic module heat collector (1) and the environment temperature is smaller than T1 and is larger than or equal to T2, the medium loop is controlled to be opened, the first heat pump working medium loop and the second heat pump working medium loop are communicated, and the double-heat-source working mode is started;
when the temperature difference between the heat exchange medium temperature of the photovoltaic module heat collector (1) and the environment temperature is smaller than T2, the medium loop is controlled to be cut off, the first heat pump working medium loop is kept to be cut off, the second heat pump working medium loop is kept to be opened, and the single air source heat source working mode is started.
9. The method of operating a combined cooling, heating and PVT, dc heat pump system of claim 8, further comprising, in a cooling mode, turning on the third heat pump working medium circuit.
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