CN106839217B - Combined heat pump air conditioning system capable of independently operating in de-electrification mode and control method thereof - Google Patents

Combined heat pump air conditioning system capable of independently operating in de-electrification mode and control method thereof Download PDF

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CN106839217B
CN106839217B CN201710144153.7A CN201710144153A CN106839217B CN 106839217 B CN106839217 B CN 106839217B CN 201710144153 A CN201710144153 A CN 201710144153A CN 106839217 B CN106839217 B CN 106839217B
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heat
heat exchanger
stop valve
pipeline
photovoltaic
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CN106839217A (en
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陈轶光
周湘江
吴晓艳
阳季春
江清阳
侯景鑫
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Jiaxing University
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Jiaxing University
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    • 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
    • F24F5/0007Air-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 cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001Compression cycle type
    • 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
    • F25B13/00Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B15/00Sorption machines, plants or systems, operating continuously, e.g. absorption type
    • F25B15/02Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
    • F25B15/06Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
    • 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
    • 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
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62Absorption based systems

Abstract

The invention discloses a de-electrified independently-operated combined type heat pump air conditioning system and a control method thereof. The problem that the operation stability of an existing air-conditioning heat pump system is poor is solved. The air source heat pump system based on photovoltaic photo-thermal utilization provides cold and heat for a building by taking mechanical energy output by an internal combustion engine as input energy; and a photoelectric plate of the photovoltaic heat exchanger is sequentially connected with the inverter controller and the storage battery through a circuit to form a power generation system to supply power to the system. The waste heat recovery system adopts two waste heat utilization modes, and when the system operates in winter, the waste heat is used as a high-temperature heat source to further heat the backwater of the system; when the lithium bromide absorption refrigerating unit operates in summer, the waste heat is used as a driving heat source of the lithium bromide absorption refrigerating unit. The invention is a novel green high-efficiency heat pump air-conditioning system with high energy utilization rate, small environmental pollution, low operation cost and stable operation.

Description

Combined heat pump air conditioning system capable of independently operating in de-electrification mode and control method thereof
Technical Field
The invention belongs to the technical field of air-conditioning energy-saving equipment, and particularly relates to a de-electrified independently-operated combined type heat pump air-conditioning system and a control method thereof.
Background
With the continuous improvement of living standard of people, the requirements of people on the comfort level and the cleanliness of living and working environments are higher and higher. Therefore, most of buildings in China have multiple requirements of winter heat supply, summer air conditioning and life hot water supply all year round, although the electric heat pump has high energy utilization rate due to the adoption of various advanced energy-saving technologies in cold and heat sources and systems, because most of the electric power of the power grid in China is supplied by coal-fired power plants, and the increase of electric equipment is basically equivalent to the increase of environmental pollution, the building cold and heat source system of other energy sources needs to be popularized from the aspects of improving the atmospheric environment quality and reducing the emission of greenhouse gases. The internal combustion engine heat pump air conditioning system taking natural gas or other fuels as input energy has the advantages of high efficiency, energy conservation, safety, environmental protection and the like, and is increasingly receiving wide attention.
Auxiliary equipment such as a fan, a water pump, a control instrument and the like of the conventional gas heat pump system still need to consume a small amount of power supply, the power is provided by a power grid, so the system cannot be independently operated from the power grid, and the auxiliary equipment also falls into paralysis like an electric air conditioner in case of power supply interruption due to power supply shortage. Therefore, the power-off independent operation gas heat pump system becomes the focus of attention. From the published data at present, the power-off independent operation gas heat pump system is mainly realized by the following modes: 1. the gas engine drags the generator to realize the independent operation of the system [ CN201310010199.1], because the heat pump system of the gas engine needs to regulate the rotating speed of the engine according to the load change, so the mode has the contradiction between the system capacity regulation and the constant speed of the generator, and simultaneously, because the generating efficiency of the generator is relatively low, the energy waste is relatively large; 2. the solar photovoltaic power generation is utilized to realize the independent operation of the system [ CN201310365773.5], and because most of solar radiation absorbed by the solar cell is not converted into electric energy, but the temperature of the cell is increased, and the increase of the temperature of the cell reduces the photoelectric conversion efficiency of the solar cell, the mode has the contradiction between the photoelectric conversion efficiency and the increase of the temperature of the cell; meanwhile, the tail end water pump of the gas heat pump has larger power and more power consumption, and the solar power generation is greatly influenced by the external environment, so that the system is difficult to ensure to operate completely independently of a power grid; 3. the patent only explains the method of photoelectric and photothermal comprehensive utilization in winter heat supply, and does not provide a photothermal and photoelectric utilization mode in summer cold supply, so that certain limitations exist.
An important aspect of the research on the gas heat pump technology is the waste heat utilization technology, and at present, the waste heat utilization of the gas heat pump is mainly used for supplying heat or providing domestic hot water, but in hot summer, heat supply is not needed, and the demand for hot water is relatively low, so that a large amount of waste heat cannot be effectively utilized, and the energy waste is very serious. Therefore, the method has very important significance for solving the problems of improving the waste heat utilization rate of the gas heat pump system, lightening the load of the power system, improving the solar photovoltaic photo-thermal utilization efficiency in winter and summer and the like.
Disclosure of Invention
The invention aims to solve the problems and provides a de-electrifying independently-operated combined heat pump air-conditioning system which organically combines a solar photovoltaic photo-thermal utilization technology, an internal combustion engine heat pump technology, an absorption refrigeration technology and a multistage transmission technology.
Another object of the present invention is to solve the above problems, and to provide a de-electrifying independently operating combined type heat pump air conditioning system with high automation degree and de-electrifying independently operating.
In order to achieve the purpose, the invention adopts the following technical scheme: the combined heat pump air-conditioning system capable of independent operation without power off is characterized by comprising a compressor, wherein the outlet end of the compressor is sequentially connected with a four-way reversing valve, a plate heat exchanger and an electronic expansion valve through pipelines, the outlet pipeline of the electronic expansion valve is respectively connected with a photovoltaic light and heat utilization system and a heat pump air-conditioning system, the heat pump air-conditioning system comprises a photovoltaic heat exchanger and a finned tube heat exchanger which are connected in parallel, the photovoltaic light and heat utilization finned tube system comprises an inverter controller connected with the photovoltaic heat exchanger, the inverter controller is connected with a power utilization side through a storage battery, the compressor is connected with a multi-stage mechanical transmission mechanism through a first electromagnetic clutch transmission, the multi-stage mechanical transmission mechanism is connected with an internal combustion engine, the system further comprises a waste heat recovery system, and the waste heat recovery system comprises a user side water return pipeline connected with the plate heat exchanger, and the user side water return pipeline is respectively connected with a first water return pipeline and a second water return pipeline.
In the de-electrifying independent operation combined type heat pump air conditioning system, the outlet pipeline of the electronic expansion valve is divided into two paths; one path of the electronic expansion valve is connected with the finned tube heat exchanger and the first electromagnetic valve; the other path of the electronic expansion valve is connected with a refrigerant pipeline of the photovoltaic heat exchanger and a second electromagnetic valve; the outlet of the first electromagnetic valve and the outlet of the second electromagnetic valve are connected through a pipeline and then sequentially connected with the four-way reversing valve, and the four-way reversing valve is connected with the inlet of the compressor.
In the de-energized independent operation combined type heat pump air conditioning system, the cooling water pipeline of the photovoltaic heat exchanger is sequentially connected with the seventh stop valve, the heat storage water tank and the eighth stop valve through pipelines to form a cooling water loop, and the refrigerant loop of the photovoltaic heat exchanger is respectively connected with the finned tube heat exchanger and the second electromagnetic valve through refrigerant pipelines.
In the de-electrifying independent operation composite heat pump air conditioning system, the first water return pipeline comprises a plate heat exchanger and a user side circulating water pump which are sequentially connected with the user side water return pipeline through pipelines, and the outlet pipeline of the user side circulating water pump is divided into two pipelines; one path of the user side circulating water pump is connected with the ninth stop valve and the tenth stop valve through pipelines; the other path of the user side circulating water pump is connected with the first stop valve; the outlet of the first stop valve is divided into two paths; one path of the first stop valve is sequentially connected with the cylinder sleeve water heat exchanger, the flue gas heat exchanger and the second stop valve through pipelines, the other path of the first stop valve is connected with a high-temperature water loop of the lithium bromide refrigerating unit, the high-temperature water loop of the lithium bromide refrigerating unit comprises a fifth stop valve, a high-temperature water pump and a high-temperature pipeline of the lithium bromide refrigerating unit, the fifth stop valve, the high-temperature water pump and the high-temperature pipeline of the lithium bromide refrigerating unit are sequentially connected with the first stop valve through pipelines, and the high-temperature pipeline of the lithium bromide refrigerating unit is sequentially connected with the high-temperature water tank, the sixth stop valve and the flue gas heat exchanger.
In the above-mentioned combined type heat pump air conditioning system of independently operating taking off electricity, the second return water pipeline include through the lithium bromide refrigerating unit refrigerated water return circuit that links to each other with user side return water pipeline, lithium bromide refrigerating unit refrigerated water return circuit include the third stop valve that links to each other with user side return water pipeline, the third stop valve pass through lithium bromide refrigerating unit's refrigerated water pipeline and link to each other with fourth stop valve and second stop valve outlet pipeline in proper order.
In the de-electrifying independent operation combined type heat pump air conditioning system, the lithium bromide refrigerating unit is connected with a cooling water loop of the lithium bromide refrigerating unit, the cooling water loop of the lithium bromide refrigerating unit comprises a cooling water pump connected with a cooling water pipeline of the lithium bromide refrigerating unit, and the cooling water pump is connected with an air cooling tower.
In the de-electrifying independent operation combined type heat pump air conditioning system, the user side circulating water pump, the cooling water pump and the high-temperature water pump are respectively connected with the multistage mechanical transmission mechanism through the second electromagnetic clutch transmission, the third electromagnetic clutch transmission and the fourth electromagnetic clutch transmission, and the start-stop control and the rotating speed control of the user side circulating water pump, the cooling water pump and the high-temperature water pump are controlled through the electromagnetic clutch transmission.
In foretell outage independent operation combined type heat pump air conditioning system, photovoltaic heat exchanger including mutual parallel arrangement's first aluminum alloy plate and second aluminum alloy plate, photovoltaic heat exchanger's cooling water pipeline and refrigerant return circuit set gradually in turn between first aluminum alloy plate and second aluminum alloy plate, just first aluminum alloy plate one side be equipped with a plurality of photoelectric glass boards through heat-conducting glue in proper order, second aluminum alloy plate outside surface be equipped with the heat insulating material layer.
In the de-electrifying independently-operated combined heat pump air-conditioning system, the cross sections of the cooling water pipeline and the refrigerant loop are square, and the cooling water pipeline and the refrigerant loop are not communicated with each other.
The control method of the de-electrifying independent operation composite heat pump air conditioning system based on the de-electrifying independent operation composite heat pump air conditioning system is as follows: the control method of the de-electrifying independent operation composite heat pump air conditioning system comprises the following steps:
A. in winter, the photovoltaic heat exchanger and the finned tube heat exchanger are used in parallel, a photoelectric plate on the surface of the photovoltaic heat exchanger absorbs sunlight to generate electric energy, one part of the electric energy is stored in a storage battery as electric energy, the other part of the electric energy supplies power to a system, the waste heat recovery system further heats the backwater of the system by using waste heat as a high-temperature heat source, and the waste heat recovery system provides the water supply temperature of the system;
B. in the operation in summer, the photovoltaic heat exchanger is only used for power generation and not used for heat exchange, the finned tube heat exchanger is used as a condenser, and the waste heat recovery system uses waste heat as a driving heat source of the waste heat recovery system to convert the heat into cold energy and supply the cold energy to a user side.
Compared with the prior art, the invention has the advantages that:
1. the solar heat pump system runs in winter, when the solar radiation intensity is good, on one hand, the photovoltaic heat exchanger absorbs solar energy to generate electricity to supply power to the system, and meanwhile, redundant electricity is stored by the storage battery to be used in rainy days and at night, on the other hand, the refrigerant absorbs heat generated by solar energy battery electricity generation when flowing through the photovoltaic heat exchanger to serve as a low-temperature heat source of the heat pump system, the evaporation temperature of the evaporator is increased, and the energy efficiency ratio of the heat pump system is improved.
2. When the solar photovoltaic heat storage water heater operates in summer, the electric three-way valve is automatically switched, indoor heat is discharged to outdoor air by the finned tube heat exchanger, a side valve of the heat storage water tank of the photovoltaic heat exchanger is opened, heat generated by power generation of the photovoltaic heat exchanger is taken away by natural circulation of water, the photoelectric conversion efficiency of a photovoltaic cell is improved, and the heat can be stored in the heat storage water tank to be used as domestic hot water.
3. In order to reduce the power consumption of system electric equipment and ensure that the system can operate completely independently of a power grid, the invention adopts a multi-stage mechanical transmission mechanism, the driving power of all water pumps in the system is provided by an internal combustion engine, and a power generation system only provides a small amount of required power for a control system and a finned tube heat exchanger fan, thereby greatly reducing the power consumption of the system. Meanwhile, the starting, the stopping, the rotating speed and the flow control of each water pump in the system are controlled by the electromagnetic clutch transmission, so that the optimal energy distribution is realized.
4. For the utilization of the waste heat of the internal combustion engine, the waste heat is used as a high-temperature heat source in winter to further heat the system backwater; the lithium bromide absorption refrigeration unit is used for driving the lithium bromide absorption refrigeration unit to supply cold to the tail end in summer, so that the waste heat utilization efficiency of the internal combustion engine heat pump is improved to the maximum extent, the energy is saved, the load of the system in winter and summer can be optimally matched, the unit design capacity is reduced, and the investment cost is saved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of a photovoltaic heat exchanger construction of the present invention;
in the figure, a compressor 1, a plate heat exchanger 2, an electronic expansion valve 3, a finned tube heat exchanger 4, a four-way reversing valve 5, a photovoltaic heat exchanger 6, a photoelectric glass plate 61, a first aluminum alloy plate 62, a second aluminum alloy plate 63, a heat insulating material layer 64, a cooling water pipeline 65, a refrigerant circuit 66, an inverter controller 7, a storage battery 8, an air cooling tower 9, a first electromagnetic valve 10, a second electromagnetic valve 11, an internal combustion engine 12, a cylinder liner water heat exchanger 13, a flue gas heat exchanger 14, a lithium bromide refrigeration unit 15, a user side circulating water pump 16, a cooling water pump 17, a high-temperature water pump 18, a multistage mechanical transmission mechanism 19, a first electromagnetic clutch transmission 20, a second electromagnetic clutch transmission 21, a third electromagnetic clutch transmission 22, a fourth electromagnetic clutch transmission 23, a high-temperature water tank 24, a heat storage water tank 25, a first stop valve 26, a second stop valve 27, a third stop valve 28, A fourth cut-off valve 29, a fifth cut-off valve 30, a sixth cut-off valve 31, a seventh cut-off valve 32, an eighth cut-off valve 33, a ninth cut-off valve 34, and a tenth cut-off valve 35.
Detailed Description
As shown in fig. 1 and fig. 2, the de-electrifying independent operation composite heat pump air conditioning system comprises a compressor 1, wherein the outlet end of the compressor 1 is sequentially connected with a four-way reversing valve 5, a plate heat exchanger 2 and an electronic expansion valve 3 through pipelines, the outlet pipeline of the electronic expansion valve 3 is respectively connected with a photovoltaic photo-thermal utilization system and a heat pump air conditioning system, the heat pump air conditioning system comprises a photovoltaic heat exchanger 6 and a finned tube heat exchanger 4 which are connected in parallel, the photovoltaic photo-thermal utilization system comprises an inverter controller 7 connected with the photovoltaic heat exchanger 6, the inverter controller 7 is connected with the electricity utilization side through a storage battery 8, the compressor 1 is connected with a multi-stage mechanical transmission mechanism 19 through a first electromagnetic clutch transmission 20, the multi-stage mechanical transmission mechanism 19 is connected with an internal combustion engine 12, the system further comprises a waste heat recovery system, and the waste heat recovery system comprises a user side water return pipeline connected with the plate heat exchanger 2, and the user side water return pipeline is respectively connected with a first water return pipeline and a second water return pipeline, the heat pump air-conditioning system is formed by connecting two outdoor heat exchangers in parallel, one is the photovoltaic heat exchanger 6, and the other is the finned tube heat exchanger 4. When the heat exchanger runs in winter, the two heat exchangers are used in parallel, and the flow of the refrigerant passing through the two heat exchangers is controlled by the electromagnetic valve according to the superheat degree of the refrigerant at the outlet; when the system runs in summer, the photovoltaic heat exchanger 6 is only used for power generation and not used for heat exchange, the finned tube heat exchanger 4 is used as a condenser, wherein the waste heat recovery system adopts two waste heat utilization modes, when the system runs in winter, the waste heat is used as a high-temperature heat source to further heat system backwater, provide system water supply temperature, and reduce water supply flow, so that the power consumption of a water pump is reduced, and energy is saved; when the lithium bromide absorption refrigerating unit operates in summer, the waste heat is used as a driving heat source of the lithium bromide absorption refrigerating unit, the heat is converted into cold energy to supply cold to a user side, the waste heat is utilized to the maximum extent, the cold supply quantity of a heat pump system is reduced, energy is effectively saved, and the condensation heat and the absorption heat generated by the system are cooled by the air cooler and are discharged to the outdoor atmosphere.
Wherein, the outlet pipeline of the electronic expansion valve 3 is divided into two paths; one path of the electronic expansion valve 3 is connected with the finned tube heat exchanger 4 and the first electromagnetic valve 10; the other path of the electronic expansion valve 3 is connected with a refrigerant pipeline of the photovoltaic heat exchanger 6 and a second electromagnetic valve 11; the outlet of the first electromagnetic valve 10 and the outlet of the second electromagnetic valve 11 are connected through a pipeline and then sequentially connected with the four-way reversing valve 5, and the four-way reversing valve 5 is connected with the inlet of the compressor 1.
The cooling water pipeline 65 of the photovoltaic heat exchanger 6 is sequentially connected with the seventh stop valve 32, the heat storage water tank 25 and the eighth stop valve 33 through pipelines to form a cooling water loop, the refrigerant loop 66 of the photovoltaic heat exchanger 6 is respectively connected with the finned tube heat exchanger 4 and the second electromagnetic valve 11 through refrigerant pipelines, and heat generated by the photoelectric glass plate due to power generation is used as a low-temperature heat source of the heat pump system through the refrigerant heat exchange loop; when the solar water heater is operated in summer, heat generated by the photoelectric glass due to power generation is absorbed by water through the cooling water loop, and the heat is stored through the heat storage water tank 25 to be used as domestic hot water.
The first water return pipeline comprises a plate heat exchanger 2 and a user side circulating water pump 16 which are sequentially connected with a user side water return pipeline through pipelines, and an outlet pipeline of the user side circulating water pump 16 is divided into two pipelines; one path of the user side circulating water pump 16 is connected with a ninth stop valve 34 and a tenth stop valve 35 through pipelines; the other path of the user side circulating water pump 16 is connected with a first stop valve 26; the outlet of the first stop valve 26 is divided into two paths; one path of the first stop valve 26 is sequentially connected with the cylinder sleeve water heat exchanger 13, the flue gas heat exchanger 14 and the second stop valve 27 through pipelines, the other path of the first stop valve 26 is connected with a high-temperature water loop of the lithium bromide refrigerating unit, the high-temperature water loop of the lithium bromide refrigerating unit comprises a fifth stop valve 30, a high-temperature water pump 18 and a high-temperature pipeline of the lithium bromide refrigerating unit 15, the fifth stop valve 30, the high-temperature water pump 18 and the high-temperature pipeline of the lithium bromide refrigerating unit 15 are sequentially connected with the high-temperature water tank 24, the sixth stop valve 31 and the flue gas heat exchanger 14 through pipelines, the high-temperature water pump 18, the cooling water pump 17, the compressor 1 and the user side circulating water pump 16 are connected with the internal combustion engine 12 through the multistage mechanical transmission mechanism 9 and the electromagnetic clutch transmission, and the internal combustion engine 12 provides power.
The second return water pipeline comprises a lithium bromide refrigerating unit chilled water loop connected with the user side return water pipeline, the lithium bromide refrigerating unit chilled water loop comprises a third stop valve 28 connected with the user side return water pipeline, and the third stop valve 28 is sequentially connected with outlet pipelines of a fourth stop valve 29 and a second stop valve 27 through a chilled water pipeline of the lithium bromide refrigerating unit 15.
Preferably, the lithium bromide refrigerating unit 15 is connected with a lithium bromide refrigerating unit cooling water loop, and the lithium bromide refrigerating unit cooling water loop comprises a cooling water pump 17 connected with a cooling water pipeline 65 of the lithium bromide refrigerating unit 15, and the cooling water pump 17 is connected with the air cooling tower 9.
The user side circulating water pump 16, the cooling water pump 17 and the high-temperature water pump 18 are respectively connected with the multi-stage mechanical transmission mechanism 19 through a second electromagnetic clutch transmission 21, a third electromagnetic clutch transmission 22 and a fourth electromagnetic clutch transmission 23, and start-stop control and rotation speed control of the user side circulating water pump 16, the cooling water pump 17 and the high-temperature water pump 18 are controlled through the electromagnetic clutch transmissions.
As shown in fig. 2, the photovoltaic heat exchanger 6 includes a first aluminum alloy plate 62 and a second aluminum alloy plate 63 disposed in parallel, a cooling water pipeline 65 and a refrigerant circuit 66 of the photovoltaic heat exchanger 6 are alternately disposed between the first aluminum alloy plate 62 and the second aluminum alloy plate 63 in sequence, a plurality of photoelectric glass plates 61 are sequentially disposed on one side of the first aluminum alloy plate 62 through a heat conducting adhesive, and a heat insulating material layer 64 is disposed on an outer surface of the second aluminum alloy plate 63 to prevent heat loss. Here, the cooling water line 65 and the refrigerant circuit 66 are both square in cross section and the cooling water line 65 and the refrigerant circuit 66 are not communicated with each other.
The control method of the de-electrifying independent operation composite heat pump air conditioning system comprises the following steps:
A. in winter, the photovoltaic heat exchanger 6 and the finned tube heat exchanger 4 are used in parallel, a photoelectric plate on the surface of the photovoltaic heat exchanger 6 absorbs sunlight to generate electric energy, one part of the electric energy is stored in the storage battery 8 as electric energy, the other part of the electric energy supplies power to the system, the waste heat recovery system uses waste heat as a high-temperature heat source to further heat system return water, and the waste heat recovery system provides system water supply temperature;
B. in the operation in summer, the photovoltaic heat exchanger 6 is only used for power generation and not used for heat exchange, the finned tube heat exchanger 4 is used as a condenser, and the waste heat recovery system uses waste heat as a driving heat source of the waste heat recovery system to convert the heat into cold energy to supply cold to a user side.
The specific working process is as follows:
when the system runs in winter, the system is in a heat supply mode, the third stop valve 28, the fourth stop valve 29, the fifth stop valve 30, the sixth stop valve 31, the seventh stop valve 32, the eighth stop valve 33, the ninth stop valve 34 and the tenth stop valve 35 are closed, the first stop valve 26 and the second stop valve 27 are opened, the third electromagnetic clutch transmission 22 and the fourth electromagnetic clutch transmission 23 are disconnected, the first electromagnetic clutch transmission 20 and the second electromagnetic clutch transmission 21 are closed, and the four-way reversing valve 5 is reversed, so that the plate type heat exchanger 2 is a condenser, and the finned tube type heat exchanger 4 or the photovoltaic heat exchanger 6 is an evaporator.
When the outdoor solar radiation intensity is strong and the heat absorbed by the photovoltaic heat exchanger meets the heat supply requirement of the heat pump, the first electromagnetic valve 10 is closed, the second electromagnetic valve 11 is opened, the internal combustion engine 12 drives the compressor 1 to operate through the multistage mechanical transmission mechanism 19, the high-temperature high-pressure refrigerant steam is released and condensed in the plate heat exchanger 2 to form high-temperature high-pressure liquid refrigerant, the high-temperature high-pressure liquid refrigerant is throttled by the electronic expansion valve 3 to become low-temperature low-pressure gas-liquid two-phase refrigerant, the low-temperature low-pressure gas-liquid two-phase refrigerant enters the photovoltaic heat exchanger 6 to absorb the heat generated by power generation of the solar photovoltaic panel and then becomes low-temperature low-pressure gas refrigerant steam, and then the low-temperature low-pressure gas refrigerant enters the compressor 1 to be compressed to form a cycle. Meanwhile, the photoelectric plate on the surface of the photovoltaic heat exchanger 6 absorbs sunlight to generate electric energy, one part of the electric energy is stored in the storage battery 8 as the electric energy, and the other part of the electric energy supplies power to the system.
The internal combustion engine 12 drives a user side circulating water pump through a multistage mechanical transmission mechanism 19 to provide circulating power for user side circulating water, user side backwater absorbs condensation heat generated by condensation of a high-temperature and high-pressure refrigerant after passing through the plate type heat exchanger 2, the temperature of the user side backwater is increased, the user side backwater enters the cylinder sleeve water heat exchanger 13 and the flue gas heat exchanger 14 and then further absorbs waste heat of the internal combustion engine to increase the temperature, and then water is supplied to a user.
When the outdoor solar radiation intensity is weak and the heat absorbed by the photovoltaic heat exchanger cannot meet the heat supply requirement of the heat pump, the first electromagnetic valve 10 and the second electromagnetic valve 11 are opened simultaneously, the opening degrees of the first electromagnetic valve 10 and the second electromagnetic valve 11 are automatically adjusted through the superheat degree of the refrigerant at the outlet, so that one part of the refrigerant enters the photovoltaic heat exchanger 6 to absorb the heat, and the other part of the refrigerant enters the finned tube heat exchanger 4 to absorb the heat of outdoor air, and therefore the normal operation of the heat pump system is guaranteed.
When the weather is rainy and at night outdoors, the first electromagnetic valve 10 is opened, the second electromagnetic valve 11 is closed, and the heat pump system absorbs the heat of outdoor air through the finned tube heat exchanger 4 to ensure the normal operation of the system.
When the system operates in summer, the system is in a cold supply mode, the first stop valve 26 and the second stop valve 27 are closed, and the third stop valve 28, the fourth stop valve 29, the fifth stop valve 30, the sixth stop valve 31, the seventh stop valve 32, the eighth stop valve 33, the ninth stop valve 34 and the tenth stop valve 35 are opened. The first electromagnetic clutch transmission 20, the second electromagnetic clutch transmission 21, the third electromagnetic clutch transmission 22 and the fourth electromagnetic clutch transmission 23 are switched on, and the four-way reversing valve 5 is reversed, so that the plate type heat exchanger 2 is an evaporator, and the finned tube type heat exchanger 2 is a condenser.
The internal combustion engine 12 drives the compressor 1 to operate through the multistage mechanical transmission mechanism 19 and the first electromagnetic clutch transmission 20, high-temperature and high-pressure gaseous refrigerant enters the finned tube heat exchanger 4 to release heat to outdoor air and then becomes high-temperature and high-pressure liquid refrigerant, the high-temperature and high-pressure liquid refrigerant is throttled by the electronic expansion 3 and then becomes low-temperature and low-pressure gas-liquid two-phase refrigerant, the gas-liquid two-phase refrigerant enters the plate heat exchanger 2 to absorb heat and then becomes low-temperature and low-pressure gaseous refrigerant, and then the gas-liquid two-phase refrigerant enters the compressor to be compressed into the high-temperature and high-pressure gaseous refrigerant to form a cycle.
When the photovoltaic heat exchanger 6 is used for refrigeration in summer, the photovoltaic panel is used for generating electricity, the seventh stop valve 32 and the eighth stop valve 33 are opened, heat generated by electricity generation of the photovoltaic panel is taken away by natural circulation of water, the photoelectric conversion efficiency of the photovoltaic panel is improved, and the heat is stored through the heat storage water tank 25 and used as life hot water.
The internal combustion engine 12 drives the user side circulating water pump 16 through the multistage mechanical transmission mechanism 19 and the second electromagnetic clutch transmission 21 to provide circulating power for the user side circulating water, and the user side return water is divided into two paths: one path of the refrigerant is subjected to temperature reduction after heat is released to a low-temperature and low-pressure gas-liquid two-phase refrigerant through the plate heat exchanger 2, and frozen water is supplied to a user side after passing through a bypass pipe where a ninth stop valve 34 and a tenth stop valve 35 are located; the other path enters a chilled water pipeline of the lithium bromide absorption refrigerating unit 15 through a third stop valve 28, releases heat, reduces the temperature, and supplies chilled water to a user through a fourth stop valve 29.
The cooling water loop of the lithium bromide refrigerating unit is mainly used for cooling solution absorption heat and condensation heat in the lithium bromide refrigerating unit, cooling water enters the lithium bromide refrigerating unit 15 through the cooling water pump 17, the solution absorption heat and the condensation heat in the lithium bromide refrigerating unit 15 are absorbed and then enter the air cooling tower 9, the absorbed heat is released for air cooling and then enters the cooling water pump 17 again, and a cooling cycle is formed. The internal combustion engine 12 drives a cooling water pump through a multistage mechanical transmission mechanism 19 to provide circulating power for cooling water.
The driving heat source of the lithium bromide absorption refrigerating unit 15 mainly comes from waste heat recovered by an internal combustion engine, medium-temperature water flowing out of a high-temperature pipeline of the lithium bromide absorption refrigerating unit 15 passes through the high-temperature water pump 18 and the fifth stop valve 30, enters the cylinder sleeve water heat exchanger 13 and the flue gas heat exchanger 14 to absorb heat, then is changed into high-temperature water at about 90 ℃, passes through the sixth stop valve 31 and the high-temperature water tank 24, enters the lithium bromide absorption refrigerating unit, drives the lithium bromide refrigerating unit to run to emit heat, then is changed into medium-temperature water, and enters the high-temperature water pump 18 again to form a cycle. The internal combustion engine 12 drives the high-temperature water pump through the multistage mechanical transmission mechanism 19 and the fourth electromagnetic clutch transmission 23 to provide power for high-temperature water circulation.
The invention organically combines the solar heat storage technology, the solar power generation technology, the internal combustion engine combustion technology, the absorption refrigeration technology, the waste heat utilization technology, the heat pump technology, the heat exchange principle, the automatic control technology and the like, realizes the dual requirements of the system for heat supply in winter and air conditioning in summer, simultaneously improves the waste heat utilization efficiency of the internal combustion engine heat pump to the maximum extent, saves energy, and is a novel green high-efficiency heat pump air conditioning system with high energy utilization rate, small environmental pollution, low operation cost and stable operation.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the compressor 1, the plate heat exchanger 2, the electronic expansion valve 3, the finned tube heat exchanger 4, the four-way selector valve 5, the photovoltaic heat exchanger 6, the photoelectric glass plate 61, the first aluminum alloy plate 62, the second aluminum alloy plate 63, the heat insulating material layer 64, the cooling water line 65, the refrigerant circuit 66, the inverter controller 7, the battery 8, the air cooling tower 9, the first electromagnetic valve 10, the second electromagnetic valve 11, the internal combustion engine 12, the cylinder water heat exchanger 13, the flue gas heat exchanger 14, the lithium bromide refrigeration unit 15, the user-side circulating water pump 16, the cooling water pump 17, the high-temperature water pump 18, the multistage mechanical transmission mechanism 19, the first electromagnetic clutch transmission 20, the second electromagnetic clutch transmission 21, the third electromagnetic clutch transmission 22, the fourth electromagnetic clutch transmission 23, the high-temperature water tank 24, the heat storage water tank 25, the first stop valve 26, the second stop valve 27, the high-temperature pump 21, the high-pressure pump, the, Third, fourth, fifth, sixth, seventh, eighth, ninth, tenth stop valves 28, 29, 30, 31, 32, 33, 34, 35, etc., without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to the spirit of the present invention.

Claims (5)

1. The de-electrifying independent operation composite heat pump air-conditioning system is characterized by comprising a compressor (1), wherein the outlet end of the compressor (1) is sequentially connected with a four-way reversing valve (5), a plate heat exchanger (2) and an electronic expansion valve (3) through pipelines, an outlet pipeline of the electronic expansion valve (3) is respectively connected with a photovoltaic and photo-thermal utilization system and a heat pump air-conditioning system, the heat pump air-conditioning system comprises a photovoltaic heat exchanger (6) and a finned tube heat exchanger (4) which are mutually connected in parallel, the photovoltaic and photo-thermal utilization system comprises an inverter controller (7) connected with the photovoltaic heat exchanger (6), the inverter controller (7) is connected with an electricity utilization side through a storage battery (8), the compressor (1) is connected with a multi-stage mechanical transmission mechanism (19) through a first electromagnetic clutch transmission (20), and the multi-stage mechanical transmission mechanism (19) is connected with an internal combustion engine (12), the system also comprises a waste heat recovery system, wherein the waste heat recovery system comprises a user side water return pipeline connected with the plate heat exchanger (2), and the user side water return pipeline is respectively connected with a first water return pipeline and a second water return pipeline; the outlet pipeline of the electronic expansion valve (3) is divided into two paths; one path of the electronic expansion valve (3) is connected with the finned tube heat exchanger (4) and the first electromagnetic valve (10); the other path of the electronic expansion valve (3) is connected with a refrigerant pipeline of the photovoltaic heat exchanger (6) and a second electromagnetic valve (11); the outlet of the first electromagnetic valve (10) is connected with the outlet of the second electromagnetic valve (11) through a pipeline and then sequentially connected with the four-way reversing valve (5), and the four-way reversing valve (5) is connected with the inlet of the compressor (1); a cooling water pipeline (65) of the photovoltaic heat exchanger (6) is sequentially connected with a seventh stop valve (32), a heat storage water tank (25) and an eighth stop valve (33) through pipelines to form a cooling water loop, and a refrigerant loop (66) of the photovoltaic heat exchanger (6) is respectively connected with the finned tube heat exchanger (4) and the second electromagnetic valve (11) through refrigerant pipelines; the first water return pipeline comprises a plate heat exchanger (2) and a user side circulating water pump (16) which are sequentially connected with the user side water return pipeline through pipelines, and an outlet pipeline of the user side circulating water pump (16) is divided into two paths; one path of the user side circulating water pump (16) is connected with a ninth stop valve (34) and a tenth stop valve (35) through pipelines; the other path of the user side circulating water pump (16) is connected with a first stop valve (26); the outlet of the first stop valve (26) is divided into two paths; one path of the first stop valve (26) is sequentially connected with the cylinder sleeve water heat exchanger (13), the flue gas heat exchanger (14) and the second stop valve (27) through pipelines, the other path of the first stop valve (26) is connected with a lithium bromide refrigerating unit high-temperature water loop, the lithium bromide refrigerating unit high-temperature water loop comprises a fifth stop valve (30), a high-temperature water pump (18) and a high-temperature pipeline of the lithium bromide refrigerating unit (15), the fifth stop valve, the high-temperature water pump and the high-temperature pipeline are sequentially connected with the first stop valve (26) through pipelines, and the high-temperature pipeline of the lithium bromide refrigerating unit (15) is sequentially connected with the high-temperature water tank (24), the sixth stop valve (31) and the flue gas heat exchanger (14); the second water return pipeline comprises a lithium bromide refrigerating unit chilled water loop connected with a user side water return pipeline, the lithium bromide refrigerating unit chilled water loop comprises a third stop valve (28) connected with the user side water return pipeline, and the third stop valve (28) is sequentially connected with a fourth stop valve (29) and an outlet pipeline of a second stop valve (27) through a chilled water pipeline of the lithium bromide refrigerating unit (15); the lithium bromide refrigerating unit (15) is connected with a lithium bromide refrigerating unit cooling water loop, the lithium bromide refrigerating unit cooling water loop comprises a cooling water pump (17) connected with a cooling water pipeline (65) of the lithium bromide refrigerating unit (15), and the cooling water pump (17) is connected with an air cooling tower (9).
2. The de-electrifying independently-operated combined heat pump air-conditioning system according to claim 1, wherein the user side circulating water pump (16), the cooling water pump (17) and the high-temperature water pump (18) are respectively connected with the multistage mechanical transmission mechanism (19) through a second electromagnetic clutch transmission (21), a third electromagnetic clutch transmission (22) and a fourth electromagnetic clutch transmission (23), and start-stop control and rotation speed control of the user side circulating water pump (16), the cooling water pump (17) and the high-temperature water pump (18) are controlled through the electromagnetic clutch transmissions.
3. The de-electrifying independent-operation composite heat pump air-conditioning system according to claim 1, wherein the photovoltaic heat exchanger (6) comprises a first aluminum alloy plate (62) and a second aluminum alloy plate (63) which are arranged in parallel, a cooling water pipeline (65) and a refrigerant loop (66) of the photovoltaic heat exchanger (6) are sequentially and alternately arranged between the first aluminum alloy plate (62) and the second aluminum alloy plate (63), a plurality of photoelectric glass plates (61) are sequentially arranged on one side of the first aluminum alloy plate (62) through heat conducting glue, and a heat insulating material layer (64) is arranged on the outer side surface of the second aluminum alloy plate (63).
4. The de-energized independently operated compound heat pump air conditioning system according to claim 3, wherein the cooling water line (65) and the refrigerant circuit (66) are each square in cross-section and the cooling water line (65) and the refrigerant circuit (66) are not in communication with each other.
5. A control method of a de-energized independent operation compound heat pump air conditioning system according to any one of claims 1 to 4, characterized in that the method comprises the following steps:
A. in winter, the photovoltaic heat exchanger (6) and the finned tube heat exchanger (4) are used in parallel, a photoelectric plate on the surface of the photovoltaic heat exchanger (6) absorbs sunlight to generate electric energy, one part of the electric energy is stored in a storage battery (8) as electric energy, the other part of the electric energy supplies power to a system, the waste heat recovery system uses waste heat as a high-temperature heat source to further heat system return water, and the waste heat recovery system provides system water supply temperature;
B. in the operation in summer, the photovoltaic heat exchanger (6) is only used for power generation and not used for heat exchange, the finned tube heat exchanger (4) is used as a condenser, and the waste heat recovery system uses the waste heat as a driving heat source of the waste heat recovery system to convert the heat into cold energy to supply cold to a user side.
CN201710144153.7A 2017-03-13 2017-03-13 Combined heat pump air conditioning system capable of independently operating in de-electrification mode and control method thereof Active CN106839217B (en)

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CN108180671B (en) * 2017-12-28 2023-12-19 嘉兴学院 Lithium bromide absorption refrigerating unit driven by waste heat of internal combustion engine and control method
CN115183497A (en) * 2022-07-07 2022-10-14 中国华电科工集团有限公司 Cooling, heating and power supply system and cooling, heating and power supply method

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