CN111006411B - Wide-ring-temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery - Google Patents
Wide-ring-temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery Download PDFInfo
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- CN111006411B CN111006411B CN201911400212.8A CN201911400212A CN111006411B CN 111006411 B CN111006411 B CN 111006411B CN 201911400212 A CN201911400212 A CN 201911400212A CN 111006411 B CN111006411 B CN 111006411B
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- 238000011084 recovery Methods 0.000 title claims abstract description 41
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 230000001172 regenerating effect Effects 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 6
- 239000003507 refrigerant Substances 0.000 description 61
- 238000010257 thawing Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides a wide-ring temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery, which comprises the following components: the system comprises a low-pressure section CO2 compressor, a high-pressure section exhaust electronic three-way valve, a high-pressure section CO2 compressor, a heat recovery plate heat exchanger, a regenerative cycle plate heat exchanger, a high-pressure electronic pressure regulating valve, an evaporator, a gas-liquid separator, a vapor separation electronic pressure regulating valve and a low-pressure section air suction electronic three-way valve; the heat recovery plate type heat exchanger adopts a six-interface form, and simultaneously recovers exhaust heat of a low-pressure section and exhaust heat of a high-pressure section, so that the maximum recovery utilization of a heat source is realized, data acquisition is carried out in an outdoor temperature change process through a controller, a controller program can control an electronic three-way valve to realize switching of heating circulation, the switching ensures that a system realizes a two-stage compression process under a low-ring temperature condition, realizes a one-stage compression process under a high-ring temperature condition, can ensure safe and reliable operation of the system, and simultaneously ensures high efficiency of the operation of the system.
Description
Technical Field
The invention relates to the technical field of heat pump systems, in particular to a wide-ring temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery.
Background
With the increasing environmental protection requirements of the country, winter heating equipment is changed from traditional coal burning to heat pump systems using electricity. The heat pump system needs to use refrigerant working medium, and natural refrigerant CO2 is favored in the novel heat pump system due to its excellent environmental protection characteristics (odp=0 and gwp=1) and excellent heating capacity. The latitude and north-south span of our country is very big, and the winter ambient temperature in northern area can be as low as-40 ℃, and the temperature span is very big, and ordinary heat pump system is difficult to adapt to the use of northern low-loop temperature.
Disclosure of Invention
According to the technical problem, a wide-ring temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery is provided.
The invention adopts the following technical means:
a wide loop temperature CO2 air source heat pump system for high pressure exhaust heat recovery, comprising:
the system comprises a low-pressure section CO2 compressor, an exhaust one-way valve, a high-pressure section exhaust electronic three-way valve, a high-pressure section CO2 compressor, a heat recovery plate heat exchanger, a regenerative cycle plate heat exchanger, a high-pressure electronic pressure regulating valve, an evaporator, a gas-liquid separator, a vapor-separation electronic pressure regulating valve, a low-pressure section air suction electronic three-way valve and an electric ball valve;
the output end of the low-pressure section CO2 compressor is finally communicated with the inlet end of the high-pressure section CO2 compressor through a pipeline with an exhaust one-way valve and a heat recovery plate heat exchanger 5;
the output pipeline of the high-pressure section CO2 compressor is communicated with the inlet of the high-pressure section exhaust electronic three-way valve, the other path of the high-pressure section exhaust electronic three-way valve is communicated with the inlet gas circuit of the gas-liquid separator finally through the heat recovery plate heat exchanger, the regenerative cycle plate heat exchanger and the evaporator in sequence, and a high-pressure electronic pressure regulating valve is arranged between the regenerative cycle plate heat exchanger and the evaporator; the last path of the high-pressure section exhaust electronic three-way valve is directly communicated with the inlet end of the evaporator;
the input end pipeline of the low-pressure section CO2 compressor is communicated with one output port of the low-pressure section air suction electronic three-way valve;
the other output pipeline of the low-pressure section air suction electronic three-way valve is communicated with the inlet end of the high-pressure section CO2 compressor and is converged into the connecting pipeline of the low-pressure section CO2 compressor and the high-pressure section CO2 compressor before entering the high-pressure section CO2 compressor;
the pipeline of the last path of input path of the low-pressure section air suction electronic three-way valve is communicated with one output pipeline of the gas-liquid separator through a regenerative cycle plate heat exchanger, and an electric ball valve is arranged on the pipeline between the plate heat exchanger and the gas-liquid separator;
the other output pipeline of the gas-liquid separator is provided with a vapor-separating electronic pressure regulating valve and finally is converged into the connecting pipeline of the gas-liquid separator and the regenerative cycle plate heat exchanger;
the pipeline inlet position of the gas-liquid separator, which is provided with the vapor-separating electronic pressure regulating valve, is positioned behind the electric ball valve.
During high-ring temperature heating, a CO2 refrigerant is compressed by a high-pressure section CO2 compressor, refrigerant gas compressed into high temperature and high pressure enters a heat recovery plate type heat exchanger through a high-pressure section exhaust electronic three-way valve, water is heated in the heat recovery plate type heat exchanger and simultaneously cools the CO2 refrigerant, a high-pressure transcritical state refrigerant is formed after cooling, the transcritical refrigerant is further cooled in a regenerative cycle plate type heat exchanger, the high-pressure transcritical refrigerant enters an evaporator after being throttled by a high-pressure electronic pressure regulating valve, the low-pressure refrigerant is evaporated and absorbs heat in the evaporator, a low-pressure gas refrigerant is formed and enters the regenerative cycle plate type heat exchanger after passing through an electric ball valve, and an overheated CO2 refrigerant is formed after passing through the plate type heat exchanger and returns to the high-pressure section compressor after passing through a low-pressure section air suction electronic three-way valve, so that heating cycle is completed. In the operation process of the compressor, the vapor separation electronic pressure regulating valve is opened, so that the oil in the vapor can return to the compressor along with the refrigerant.
And during low-ring-temperature heating, the CO2 refrigerant is compressed by the low-pressure stage CO2 compressor, the refrigerant gas compressed into high-temperature medium-pressure is fed into the heat recovery plate heat exchanger, water is heated in the heat recovery plate heat exchanger and simultaneously cools the CO2 refrigerant, the medium-pressure refrigerant is formed after cooling, the medium-pressure refrigerant is fed into the high-pressure stage CO2 compressor for continuous compression, the refrigerant gas compressed into high-temperature high-pressure enters the heat recovery plate heat exchanger again through the high-pressure stage exhaust electronic three-way valve, the water is heated in the heat recovery plate heat exchanger and simultaneously cools the CO2 refrigerant, the high-pressure trans-critical state refrigerant is formed after cooling, the trans-critical refrigerant is further cooled in the heat recovery plate heat exchanger, the trans-critical refrigerant is throttled by the high-pressure electronic pressure regulating valve and then enters the evaporator, the low-pressure refrigerant is evaporated and absorbed in the evaporator, the low-pressure gas refrigerant is fed into the heat recovery plate heat exchanger through the electric ball valve, the CO2 refrigerant in an overheat state is formed after passing through the plate heat exchanger, and the overheat state refrigerant is returned to the low-pressure stage compressor after passing through the low-pressure stage air suction electronic three-way valve, and the heat recovery cycle is completed. In the operation process of the compressor, the vapor separation electronic pressure regulating valve is opened, so that the oil in the vapor can return to the compressor along with the refrigerant.
During defrosting, a CO2 refrigerant is compressed by the high-pressure section CO2 compressor, compressed into high-temperature high-pressure refrigerant gas, the high-temperature high-pressure refrigerant gas enters the evaporator through the high-pressure section exhaust electronic three-way valve, the high-temperature gas is used for defrosting the evaporator, the high-pressure refrigerant after defrosting enters the regenerative cycle plate heat exchanger after being throttled and depressurized by the vapor-separation electronic pressure regulating valve, and part of heat is absorbed and then returns to the high-pressure section compressor through the low-pressure section air suction electronic three-way valve, so that defrosting cycle is completed.
The invention has the advantages that: the wide-ring temperature type CO2 air source heat pump system can realize the heating process of high-ring temperature and low-ring temperature, and can well meet the winter application in northern areas of China. The hot water prepared by the heat pump system can be used for various aspects such as household hot water, heating and the like. The electronic three-way valve is controlled by the controller, so that intelligent conversion can be realized, and good matching performance is realized between system operation and environmental working conditions. The system has strong practicability and universality, accords with the current energy-saving and environment-friendly design concept, and provides a good system design for future heat pump system application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1-a schematic diagram of a high-loop-temperature heating cycle of the present invention.
FIG. 2-a schematic diagram of a low loop temperature heating cycle of the present invention.
FIG. 3-a schematic view of the defrost cycle of the present invention patent.
In the figure: the system comprises a 1-low pressure section CO2 compressor, a 2-exhaust one-way valve, a 3-high pressure section exhaust electronic three-way valve, a 4-high pressure section CO2 compressor, a 5-heat recovery plate heat exchanger, a 6-regenerative cycle plate heat exchanger, a 7-high pressure electronic pressure regulating valve, an 8-evaporator, a 9-gas-liquid separator, a 10-vapor separation electronic pressure regulating valve, an 11-low pressure section air suction electronic three-way valve and a 12-electric ball valve.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
As shown in fig. 1, the present invention provides a wide-loop temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery, comprising:
the low-pressure section CO2 compressor 1, the exhaust one-way valve 2, the high-pressure section exhaust electronic three-way valve 3, the high-pressure section CO2 compressor 4, the heat recovery plate heat exchanger 5, the regenerative cycle plate heat exchanger 6, the high-pressure electronic pressure regulating valve 7, the evaporator 8, the gas-liquid separator 9, the vapor-separation electronic pressure regulating valve 10, the low-pressure section air suction electronic three-way valve 11 and the electric ball valve 12;
the output end of the low-pressure section CO2 compressor 1 is finally communicated with the inlet end of the high-pressure section CO2 compressor 4 through a pipeline with an exhaust one-way valve 2 by a heat recovery plate heat exchanger 5;
the output pipeline of the high-pressure section CO2 compressor 4 is communicated with the inlet of the high-pressure section exhaust electronic three-way valve 3, the other path of the high-pressure section exhaust electronic three-way valve 3 is communicated with the inlet gas path of the gas-liquid separator 9 finally through the heat recovery plate heat exchanger 5, the regenerative cycle plate heat exchanger 6 and the evaporator 8 in sequence, and a high-pressure electronic pressure regulating valve 7 is arranged between the regenerative cycle plate heat exchanger 6 and the evaporator 8; the last path of the high-pressure section exhaust electronic three-way valve 3 is directly communicated with the inlet end of the evaporator 8;
the input end pipeline of the low-pressure section CO2 compressor 1 is communicated with an output port of the low-pressure section air suction electronic three-way valve 11;
the other output pipeline of the low-pressure section air suction electronic three-way valve 11 is communicated with the inlet end of the high-pressure section CO2 compressor 4 and is converged on the connecting pipeline of the low-pressure section CO2 compressor 1 and the high-pressure section CO2 compressor 4 before entering the high-pressure section CO2 compressor 4;
the pipeline of the last path of input path of the low-pressure section air suction electronic three-way valve 11 is communicated with one output pipeline of the gas-liquid separator 9 through the regenerative cycle plate heat exchanger 6, and an electric ball valve 12 is arranged on the pipeline between the plate heat exchanger 6 and the gas-liquid separator 9;
the other output pipeline of the gas-liquid separator 9 is provided with a vapor-separating electronic pressure regulating valve 10, and finally the vapor-separating electronic pressure regulating valve is converged into the connecting pipeline of the gas-liquid separator 9 and the regenerative cycle plate heat exchanger 6;
the gas-liquid separator 9 is provided with a gas-separating electronic pressure regulating valve 10, the pipeline inlet position of which is located behind an electric ball valve 12.
As shown in fig. 1, during high-temperature heating, a high-pressure section CO2 compressor compresses a CO2 refrigerant, the compressed high-temperature high-pressure refrigerant gas enters a heat recovery plate heat exchanger, water is heated in the heat recovery plate heat exchanger and simultaneously cools the CO2 refrigerant, the high-pressure transcritical refrigerant is formed after cooling, the transcritical refrigerant is further cooled in a regenerative cycle plate heat exchanger, the high-pressure electronic pressure regulating valve throttles the transcritical refrigerant and enters an evaporator, the low-pressure refrigerant evaporates and absorbs heat in the evaporator, the low-pressure gas refrigerant is formed and enters the regenerative cycle plate heat exchanger after passing through an electric ball valve, the overheated CO2 refrigerant is formed after passing through the plate heat exchanger, and the overheated refrigerant returns to the high-pressure section compressor after passing through the low-pressure section air suction electronic three-way valve, so that heating cycle is completed. In the operation process of the compressor, the vapor separation electronic pressure regulating valve is opened, so that the oil in the vapor can return to the compressor along with the refrigerant.
As shown in fig. 2, during low-ring temperature heating, the CO2 refrigerant is compressed by the low-pressure stage CO2 compressor, refrigerant gas compressed into high-temperature medium-pressure is sent into the heat recovery plate heat exchanger after passing through the high-pressure stage exhaust electronic three-way valve, water is heated in the heat recovery plate heat exchanger and simultaneously cools the CO2 refrigerant, medium-pressure refrigerant is formed after cooling, the medium-pressure refrigerant enters the high-pressure stage CO2 compressor for continuous compression, the refrigerant gas compressed into high-temperature high-pressure is sent into the heat recovery plate heat exchanger again, the high-pressure refrigerant is heated in the heat recovery plate heat exchanger and simultaneously cools the CO2 refrigerant, the high-pressure trans-critical refrigerant is formed after cooling, the trans-critical refrigerant is further cooled in the heat recovery plate heat exchanger, the trans-critical refrigerant is sent into the evaporator after being throttled by the high-pressure electronic pressure regulating valve, the low-pressure refrigerant is evaporated and absorbed in the evaporator, the low-pressure refrigerant is sent into the heat recovery plate heat exchanger after passing through the electric ball valve, the super-heated state CO2 refrigerant is formed after passing through the plate heat exchanger, and the super-heated state refrigerant is sent back to the low-pressure stage electronic three-way valve, and the heat exchanger is cooled, and the heat-cycle is completed. In the operation process of the compressor, the vapor separation electronic pressure regulating valve is opened, so that the oil in the vapor can return to the compressor along with the refrigerant.
As shown in fig. 3, during defrosting, the low-pressure section CO2 compressor compresses the CO2 refrigerant, refrigerant gas compressed into high temperature and medium pressure enters the evaporator through the high-pressure section exhaust electronic three-way valve, the high temperature gas is used for defrosting the evaporator, the medium pressure refrigerant after defrosting enters the regenerative cycle plate heat exchanger after being throttled and depressurized through the vapor separation electronic pressure regulating valve, and part of heat is absorbed and then returns to the low-pressure section compressor through the low-pressure section air suction electronic three-way valve, so that defrosting cycle is completed.
As shown in fig. 1, the heat recovery plate heat exchanger 5 adopts a six-port form, and recovers the exhaust heat of the low-pressure section and the exhaust heat of the high-pressure section at the same time, thereby realizing the maximum recovery and utilization of the heat source.
As shown in fig. 1 and 2, the outdoor temperature change process is performed through the controller, the controller program can control the electronic three-way valve to realize the switching of the heating cycle, the two-stage compression process is ensured to be realized by the system under the condition of low ring temperature, the one-stage compression process is ensured to be realized under the condition of high ring temperature, the safe and reliable operation of the system can be ensured, and meanwhile, the high efficiency of the operation of the system is ensured.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (2)
1. The wide-ring temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery is characterized by comprising:
the low-pressure section CO2 compressor (1), the exhaust one-way valve (2), the high-pressure section exhaust electronic three-way valve (3), the high-pressure section CO2 compressor (4), the heat recovery plate heat exchanger (5), the regenerative cycle plate heat exchanger (6), the high-pressure electronic pressure regulating valve (7), the evaporator (8), the gas-liquid separator (9), the vapor-separation electronic pressure regulating valve (10), the low-pressure section air suction electronic three-way valve (11) and the electric ball valve (12);
the output end of the low-pressure section CO2 compressor (1) is finally communicated with the inlet end of the high-pressure section CO2 compressor (4) through a pipeline with an exhaust one-way valve (2) by a heat recovery plate heat exchanger (5);
the output pipeline of the high-pressure section CO2 compressor (4) is communicated with the inlet of the high-pressure section exhaust electronic three-way valve (3), the other path of the high-pressure section exhaust electronic three-way valve (3) is communicated with the inlet gas path of the gas-liquid separator (9) finally through the heat recovery plate heat exchanger (5), the regenerative cycle plate heat exchanger (6) and the evaporator (8) in sequence, and a high-pressure electronic pressure regulating valve (7) is arranged between the regenerative cycle plate heat exchanger (6) and the evaporator (8) through the pipeline; the last path of the high-pressure section exhaust electronic three-way valve (3) is directly communicated with the inlet end of the evaporator (8);
the input end pipeline of the low-pressure section CO2 compressor (1) is communicated with an output port of the low-pressure section air suction electronic three-way valve (11);
the other output pipeline of the low-pressure section air suction electronic three-way valve (11) is communicated with the inlet end of the high-pressure section CO2 compressor (4) and is converged into the connecting pipeline of the low-pressure section CO2 compressor (1) and the high-pressure section CO2 compressor (4) before entering the high-pressure section CO2 compressor (4);
the pipeline of the last path of the low-pressure section air suction electronic three-way valve (11) is communicated with one output pipeline of the gas-liquid separator (9) through the regenerative cycle plate heat exchanger (6), and an electric ball valve (12) is arranged on the pipeline between the regenerative cycle plate heat exchanger (6) and the gas-liquid separator (9);
the other output pipeline of the gas-liquid separator (9) is provided with a vapor-separating electronic pressure regulating valve (10), and finally the vapor-separating electronic pressure regulating valve is converged on the connecting pipeline of the gas-liquid separator (9) and the regenerative cycle plate heat exchanger (6).
2. The wide-loop temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery according to claim 1, wherein:
the pipeline inlet position of the gas-liquid separator (9) provided with the vapor-separating electronic pressure regulating valve (10) is positioned behind the electric ball valve (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911400212.8A CN111006411B (en) | 2019-12-30 | 2019-12-30 | Wide-ring-temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911400212.8A CN111006411B (en) | 2019-12-30 | 2019-12-30 | Wide-ring-temperature type CO2 air source heat pump system for high-pressure exhaust heat recovery |
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| CN111006411A CN111006411A (en) | 2020-04-14 |
| CN111006411B true CN111006411B (en) | 2023-12-19 |
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