CN114812017A - Enhanced vapor injection system and operation method thereof - Google Patents
Enhanced vapor injection system and operation method thereof Download PDFInfo
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- CN114812017A CN114812017A CN202210318360.0A CN202210318360A CN114812017A CN 114812017 A CN114812017 A CN 114812017A CN 202210318360 A CN202210318360 A CN 202210318360A CN 114812017 A CN114812017 A CN 114812017A
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
- F24F11/47—Responding to energy costs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/38—Expansion means; Dispositions thereof specially adapted for reversible cycles, e.g. bidirectional expansion restrictors
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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
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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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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2101—Temperatures in a bypass
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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]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides an enhanced vapor injection system and an operation method thereof, wherein the system comprises: the temperature detection module is used for detecting the inlet temperature of the auxiliary road, the outlet temperature of the auxiliary road, the outdoor environment temperature T1, the middle temperature of the indoor heat exchanger and the middle temperature of the outdoor heat exchanger; the data processing module is used for converting the pressure Pm of the working medium in a two-phase region of the pressure-enthalpy diagram according to the inlet temperature of the auxiliary road; and the control module is used for adjusting the opening of the first throttle valve and/or the second throttle valve according to a comparison result of the outdoor environment temperature T1 and a preset temperature and a comparison result of a ratio of the pressure Pm and a target intermediate pressure Pm0 and a preset ratio. The invention can ensure that the energy efficiency of the system is in a better energy efficiency range, improve the energy efficiency and the reliability of the system and improve the control precision of the throttle valve.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an enhanced vapor injection system and an operation method thereof.
Background
When the existing air conditioner wants to realize main path supercooling and enhanced vapor injection technology, a plate heat exchanger is used, the plate heat exchanger is provided with a main path inlet and outlet and an auxiliary path inlet and outlet, and generally liquid is taken as an auxiliary path after the main path is supercooled. The temperature change in the air conditioning system is relatively slow, and the air injection enthalpy increasing effect cannot be fully exerted by controlling the opening of the throttle valve by the superheat degree.
If the plate heat exchanger auxiliary circuit takes liquid after the main circuit is supercooled during refrigeration, the plate heat exchanger auxiliary circuit necessarily takes liquid before the main circuit is supercooled during heating, which may cause a refrigerant at an inlet of the auxiliary circuit to be in a gas-liquid two-phase state, and a throttling component is intermittently blocked during throttling, so that the throttling effect of the auxiliary circuit is seriously influenced; the liquid is taken before throttling, the supercooling degree of a main path is insufficient or no supercooling state occurs, the refrigeration or heating effect of the system cannot be improved, and the purpose and the function of the technology are lost.
Disclosure of Invention
Aiming at the problems, the invention provides an enhanced vapor injection system and an operation method thereof, which can ensure that the energy efficiency of the system is in a better energy efficiency range and improve the energy efficiency and the reliability of the system.
In order to solve the problems, the invention provides an enhanced vapor injection system, which comprises a compressor, an indoor heat exchanger, an auxiliary heat exchanger, a first throttle valve and an outdoor heat exchanger, wherein the compressor is sequentially communicated through a pipeline and forms a working medium circulation flow path; the auxiliary heat exchanger is provided with a main path and an auxiliary path, a second throttle valve is arranged between an outlet of the main path and an inlet of the auxiliary path, and an outlet of the auxiliary path is communicated with the enhanced vapor injection air inlet; the enhanced vapor injection system further comprises: the temperature detection module is used for detecting the inlet temperature of the auxiliary road, the outlet temperature of the auxiliary road, the outdoor environment temperature T1, the middle temperature of the indoor heat exchanger and the middle temperature of the outdoor heat exchanger; the data processing module is used for converting the pressure Pm of the working medium in a two-phase region of the pressure-enthalpy diagram according to the inlet temperature of the auxiliary circuit; and the control module is used for adjusting the opening of the first throttle valve and/or the second throttle valve according to a comparison result of the outdoor environment temperature T1 and a preset temperature and a comparison result of the ratio of the pressure Pm and the target intermediate pressure Pm0 and a preset ratio.
The enhanced vapor injection has better intermediate pressure, and the improvement of the heating effect and the energy efficiency are better when the intermediate pressure is better. According to the invention, the opening degree of the first throttle valve and/or the second throttle valve is/are adjusted according to the comparison result of the outdoor environment temperature T1 and the preset temperature and the comparison result of the ratio of the pressure Pm and the target intermediate pressure Pm0 and the preset ratio, so that the energy efficiency of the system can be ensured to be in a better energy efficiency range, the energy efficiency and the reliability of the system are improved, the control precision of the throttle valves is improved, the temperature change is more obvious compared with the pressure change, and the response speed of the adjustment of the opening degree of the throttle valves can be improved; in addition, the corresponding pressure is converted by adopting the temperature in the two-phase region of the working medium pressure-enthalpy diagram, so that the use of a pressure sensor is omitted, and the manufacturing cost can be greatly reduced.
In an optional technical scheme of the invention, the auxiliary valve further comprises a first auxiliary pipeline communicated between the first port of the main road and the inlet of the auxiliary road, a second auxiliary pipeline communicated between the second port of the main road and the inlet of the auxiliary road, a first electromagnetic valve arranged between the first port and the second throttle valve, and a second electromagnetic valve arranged between the second port and the second throttle valve.
According to the technical scheme, no matter in a refrigerating or heating mode, the system throttles and takes liquid after the main road is subcooled, so that when the system is in the refrigerating or heating mode, the effect of increasing the vapor injection can be effectively exerted and improved, on one hand, the working medium at the inlet of the auxiliary road can be ensured to be pure liquid, the throttling effect of a throttling component is ensured, on the other hand, the supercooling degree of the main road is improved, the system performance can be effectively improved, and the system energy efficiency and reliability are improved.
In an optional technical scheme, the system further comprises a judging module for judging the operation mode of the enhanced vapor injection system.
According to the technical scheme, different control modes are adopted for the opening degree of the first throttle valve and/or the second throttle valve according to different operation modes, so that the control precision of the throttle valves is improved, and the energy efficiency of the system is improved.
In the optional technical scheme, when the enhanced vapor injection system is in an oil return or defrosting mode, the second throttle valve, the first electromagnetic valve and the second electromagnetic valve are closed, and the control module adjusts the opening degree of the first throttle valve according to the comparison result of the return air superheat degree and the preset superheat degree range; and switching the operation mode of the enhanced vapor injection system according to the comparison result of the outdoor environment temperature and the preset temperature. The opening of the first throttle valve is adjusted through the superheat degree of returned air, so that liquid return of the compressor can be prevented; and switching the operation mode of the enhanced vapor injection system according to the comparison result of the outdoor environment temperature and the preset temperature, so that the oil return or defrosting effect can be ensured.
In the optional technical scheme, when the enhanced vapor injection system is in a refrigeration mode, the first electromagnetic valve is opened, and the second electromagnetic valve is closed; when the outdoor environment temperature T1 is not higher than a first preset temperature, adjusting the opening of the first throttle valve according to the superheat degree of return air; when the outdoor environment temperature T1 is lower than the first preset temperature, adjusting the opening of the second throttle valve to a first initial opening; and adjusts the opening degree of the second throttle valve in accordance with the ratio of the pressure Pm to the target intermediate pressure Pm 0.
According to the technical scheme, under different outdoor environment temperatures, the opening degree of the first throttle valve or the opening degree of the second throttle valve are adjusted in different modes, the state of working media entering the compressor and the energy efficiency of the system can be considered, liquid impact on the compressor is prevented, and the system is enabled to operate within a better energy efficiency range.
In the optional technical scheme, when the enhanced vapor injection system is in a heating mode, the first electromagnetic valve is closed, and the second electromagnetic valve is opened; when the outdoor environment temperature T1 is not less than a second preset temperature, adjusting the opening of the first throttle valve according to the return air superheat degree; when the outdoor environment temperature T1 is lower than a second preset temperature, adjusting the opening of the second throttle valve to a second initial opening, and determining the second initial opening according to the comparison result of the outdoor environment temperature T1 and the preset temperature range; and adjusts the opening degree of the second throttle valve in accordance with the ratio of the pressure Pm to the target intermediate pressure Pm 0.
According to the technical scheme, under different outdoor environment temperatures, the opening degree of the first throttle valve or the opening degree of the second throttle valve are adjusted in different modes, the state of working media entering the compressor and the energy efficiency of the system can be considered, liquid impact on the compressor is prevented, and the system is enabled to operate within a better energy efficiency range.
In the optional technical scheme of the invention, when the temperature is 0 ℃ and T4 are less than 7 ℃, the second initial opening is 56-320 steps; when the temperature is 6 ℃ and T4 is less than or equal to 0 ℃, the second initial opening is 76-340 steps; when the temperature T4 is less than or equal to minus 6 ℃, the second initial opening degree is 96-360 steps.
According to the technical scheme, different outdoor environment temperatures and different second initial opening degrees of the second throttling valve are beneficial to improving the control precision of the second throttling valve, so that the energy efficiency of the system is in a better energy efficiency range.
In an optional technical scheme of the invention, the method further comprises the step of correcting the opening degrees of the first throttle valve and the second throttle valve according to a comparison result of the auxiliary superheat degree and a preset superheat degree range in a refrigerating or heating mode.
According to the technical scheme, the opening degrees of the first throttle valve and the second throttle valve are adjusted through the superheat degree of the auxiliary passage, the superheat degree of the auxiliary passage can be guaranteed, and liquid return of the compressor is prevented.
The invention also provides an operation method of the enhanced vapor injection system, wherein the enhanced vapor injection system is the enhanced vapor injection system, and the operation method of the enhanced vapor injection system comprises the following steps:
detecting the inlet temperature of the auxiliary road, the outlet temperature of the auxiliary road, the outdoor environment temperature T1, the middle temperature of the indoor heat exchanger and the middle temperature of the outdoor heat exchanger;
converting the pressure Pm of the working medium in a two-phase region of a pressure-enthalpy diagram according to the inlet temperature of the auxiliary circuit;
and adjusting the opening degree of the first throttle valve and/or the second throttle valve according to the comparison result of the outdoor environment temperature T1 and the preset temperature and the comparison result of the ratio of the pressure Pm and the target middle pressure Pm0 and the preset ratio.
The optional technical scheme of the invention also comprises; and correcting the opening degree of the first throttle valve and the opening degree of the second throttle valve according to the comparison result of the degree of superheat of the auxiliary road and a preset degree of superheat range, wherein the degree of superheat of the auxiliary road is the difference value between the outlet temperature of the auxiliary road and the inlet temperature of the auxiliary road.
Drawings
Fig. 1 is a schematic structural diagram of an enhanced vapor injection system according to an embodiment of the present invention.
Fig. 2 is a schematic flow direction diagram of a working medium of the enhanced vapor injection system in the refrigeration mode according to the embodiment of the present invention.
Fig. 3 is a schematic flow direction diagram of the working medium of the enhanced vapor injection system in the heating mode in the embodiment of the invention.
Fig. 4 is a schematic flow chart of a method for operating an enhanced vapor injection system according to an embodiment of the present invention.
Fig. 5 is a schematic flow chart of a specific operation method of the enhanced vapor injection system according to the embodiment of the invention.
Reference numerals:
a compressor 1; an indoor heat exchanger 2; an indoor unit 2 a; an indoor unit 2 b; an indoor unit throttling element EXVa; an indoor unit throttling element EXVb; an auxiliary heat exchanger 3; an outdoor heat exchanger 4; a four-way valve 5; a first auxiliary line 61; a second auxiliary line 62; a first throttle valve EXV 1; second throttle valve EXV 2; a first solenoid valve SV 1; a second solenoid valve SV 2; an auxiliary road inlet temperature sensor 7a 1; a bypass outlet temperature sensor 7a 2; a compressor return air temperature sensor 7 h; an outdoor ambient temperature sensor 71; outdoor ambient temperature T1; the indoor heat exchanger middle temperature T2; the temperature of the middle part of the outdoor heat exchanger T3B; the return air temperature Th of the compressor; inlet temperature TA 1; auxiliary circuit outlet temperature TA 2; the initial opening degree a.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention provides an enhanced vapor injection system, which includes a compressor 1, an indoor heat exchanger 2, an auxiliary heat exchanger 3, a first throttle valve EXV1, and an outdoor heat exchanger 5, which are sequentially connected through a pipeline and form a working medium circulation flow path, wherein the compressor 1 has an enhanced vapor injection inlet 11; the auxiliary heat exchanger 3 is provided with a main path and an auxiliary path, a second throttle valve EXV2 is arranged between the outlet of the main path and the inlet of the auxiliary path, and the outlet of the auxiliary path is communicated with the enhanced vapor injection inlet 11; the enhanced vapor injection system further comprises: the temperature detection module (comprising a secondary inlet temperature sensor 7A, a secondary outlet temperature sensor 7B, a compressor return air temperature sensor 7h, an outdoor environment temperature sensor 71, an indoor heat exchanger middle temperature sensor (not shown) and an outdoor heat exchanger middle temperature sensor (not shown)) is used for detecting an inlet temperature TA1 of the secondary, an outlet temperature TA2 of the secondary, an outdoor environment temperature T1, an indoor heat exchanger middle temperature T2 and an outdoor heat exchanger middle temperature T3B; the data processing module (not shown in the figure) converts the pressure Pm of the working medium in the two-phase region of the pressure-enthalpy diagram according to the inlet temperature TA1 of the auxiliary circuit; a control module (not shown in the figure), according to the comparison result of the outdoor environment temperature T1 and the preset temperature and according to the comparison result of the ratio of the pressure Pm and the target intermediate pressure Pm0 and the preset ratio (
P0 is the pressure corresponding to T2 in the two-phase region of the working medium pressure-enthalpy diagram, Pk is the pressure corresponding to T3B in the two-phase region of the working medium pressure-enthalpy diagram), and the opening degree of the first throttle valve EXV1 and/or the second throttle valve EXV2 is/are adjusted.
The enhanced vapor injection enthalpy has better intermediate pressure, and the improvement of the heating effect and the energy efficiency are better when the intermediate pressure is better, the opening degree of the first throttle valve EXV1 and/or the second throttle valve EXV2 is adjusted according to the comparison result of the outdoor environment temperature T1 and the preset temperature and the comparison result of the ratio of the pressure Pm to the target intermediate pressure Pm0 and the preset ratio, so that the energy efficiency of the system can be ensured to be in a better energy efficiency range, and the energy efficiency and the reliability of the system are improved.
In particular, the auxiliary heat exchanger 3 is a plate heat exchanger. The plate heat exchanger has the advantages of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, convenience in installation and cleaning, wide application and long service life; under the condition of the same pressure loss, the heat transfer coefficient of the heat exchanger is 3-5 times higher than that of the tubular heat exchanger, the occupied area of the heat exchanger is one third of that of the tubular heat exchanger, and the heat exchange efficiency is very high.
In a preferred embodiment of the present invention, the indoor heat exchanger 2 includes a plurality of indoor units (2a, 2b … …) arranged in parallel, and an indoor unit throttling element (EXVa, EXVb … …) is provided between each indoor unit (2a, 2b … …) and the auxiliary heat exchanger 5. The enhanced vapor injection system is suitable for a multi-connected enhanced vapor injection system, and independent indoor unit throttling elements (EXVa and EXVb … …) are arranged for each indoor unit (2a and 2b … …) so as to meet different user requirements.
In a preferred embodiment of the present invention, the present invention further comprises a four-way valve 5, and four ports of the four-way valve 5 are respectively connected to the working medium inlet, the working medium outlet, the outdoor heat exchanger 4 and the indoor heat exchanger 2 of the compressor 1. The four-way valve 5 can control the flow direction of the working medium, so that the operation mode of the system can be adjusted according to the requirement.
In a preferred embodiment of the present invention, the vehicle further includes a first auxiliary line 61 communicating between the first port of the main path and the inlet of the auxiliary path, a second auxiliary line 62 communicating between the second port of the main path and the inlet of the auxiliary path, a first solenoid valve SV1 provided between the first port and the second throttle valve EXV2, and a second solenoid valve SV2 provided between the second port and the second throttle valve EXV 2.
According to the technical scheme, no matter in a refrigeration or heating mode, the system throttles and takes liquid after the main path is subcooled, so that when the system is in the refrigeration or heating mode, the effect of increasing the vapor injection can be effectively exerted and improved, on one hand, the working medium at the inlet of the auxiliary path can be ensured to be pure liquid, the throttling effect of a throttling component is ensured, on the other hand, the supercooling degree of the main path is improved, the system performance can be effectively improved, and the system energy efficiency and reliability are improved.
Specifically, as shown in fig. 2, in the cooling mode, the second solenoid valve SV2 is closed, the working medium at the outlet of the compressor 1 sequentially passes through the four-way valve 5, the outdoor heat exchanger 4, the first throttle valve EXV1, the main path inlet and the main path outlet, the working medium at the main path outlet forms two flow paths, the first flow path enters the enhanced vapor injection inlet 11 of the compressor 1 through the second throttle valve EXV2, the auxiliary path inlet and the auxiliary path outlet to realize enhanced vapor injection, and the second flow path enters the return port of the compressor 1 through the indoor unit throttling elements (EXVa, EXVb … …), the indoor units (2a, 2b … …) and the four-way valve 5.
As shown in fig. 3, in the heating mode, the first solenoid valve SV1 (closed, working medium at the outlet of the compressor 1 passes through the four-way valve 5, the indoor heat exchanger 2, the indoor unit throttling elements (EXVa, EXVb … …), the main path inlet, the main path outlet in sequence, the working medium at the main path outlet forms two flow paths, the first flow path enters the enhanced vapor injection inlet 11 of the compressor 1 through the second throttling valve EXV2, the auxiliary path inlet, the auxiliary path outlet to realize enhanced vapor injection, and the second flow path enters the return air port of the compressor 1 through the first throttling valve EXV1, the outdoor heat exchanger 4, and the four-way valve 5.
In a preferred embodiment of the present invention, the system further comprises a determining module for determining an operation mode of the enhanced vapor injection system. According to different operation modes, different control modes are adopted for the opening degree of the first throttle valve EXV1 and/or the second throttle valve EXV2, so that the control precision of the throttle valves is improved, and the energy efficiency of the system is improved.
In a preferred embodiment of the invention, when the enhanced vapor injection system is in an oil return or defrosting mode, the second throttle valve EXV2, the first electromagnetic valve SV1 and the second electromagnetic valve SV2 are closed, and the control module adjusts the opening of the first throttle valve EXV1 according to the comparison result of the return air superheat degree and the preset superheat degree range; switching the operation mode of the enhanced vapor injection system according to the comparison result of the outdoor environment temperature T1 and the preset temperature;
the return air superheat degree is the difference between the return air temperature Th of the compressor and the temperature T2 of the middle part of the indoor heat exchanger. The opening degree of the first throttle valve EXV1 is adjusted through the return air superheat degree, so that the liquid return of the compressor 1 can be prevented; according to the comparison result of the outdoor environment temperature T1 and the preset temperature (the first preset temperature T01 or the first preset temperature T02), the operation mode of the enhanced vapor injection system is switched, and the oil return or defrosting effect is favorably ensured.
Specifically, the step of adjusting the opening degree of the first throttle valve EXV1 by the control module according to the comparison result of the return air superheat degree and the preset superheat degree range includes:
t06 is less than or equal to Th-T2, and the opening of the first throttle valve EXV1 is controlled to be increased according to a first variable; t05< Th-T2< T06, controlling the opening degree of the first throttle valve EXV1 to be increased according to a second variable, T04 and Th-T2 and T05 to be maintained, and controlling the opening degree of the first throttle valve EXV1 to be maintained; t03< Th-T2< T04, controlling to reduce the opening degree of the first throttle valve EXV1 according to a second variable, Th-T2< T03, and controlling to reduce the opening degree of the first throttle valve EXV1 according to a first variable, wherein the first variable is larger than the second variable. Wherein, T06 takes a value of 7-11 ℃, T05 takes a value of 5-7 ℃, T04 takes a value of 3-5 ℃, T03 takes a value of 1-3 ℃, the first variable is 16-32 steps, the second variable is 4-16 steps, the initial opening of the first throttle valve EXV1 is 400 steps during refrigeration, defrosting and oil return, and the initial opening of the first throttle valve EXV1 is 96-360 steps during heating.
In the preferred embodiment of the invention, when the enhanced vapor injection system is in a refrigeration mode, a first electromagnetic valve SV1 is opened, and a second electromagnetic valve SV2 is closed; when the outdoor environment temperature T1 is not more than a first preset temperature T01 (the value of T01 is 30-42 ℃), adjusting the opening of a first throttle valve EXV1 according to the superheat degree of return air; when the outdoor ambient temperature T1 is less than the first preset temperature T01, adjusting the opening degree of the second throttle valve EXV2 to a first initial opening degree (steps 96-360); and adjusts the opening degree of the second throttle valve EXV2 in accordance with the ratio of the pressure Pm to the target intermediate pressure Pm 0.
Through the mode, under different outdoor environment temperatures T1, the opening degree of the first throttle valve EXV1 or the opening degree of the second throttle valve EXV2 are adjusted in different modes, the state of the working medium entering the compressor 1 and the energy efficiency of the system can be considered, liquid impact on the compressor 1 is prevented, and the system is enabled to operate in a better energy efficiency range.
Specifically, the step of adjusting the opening degree of the second throttle valve EXV2 according to the ratio of the pressure Pm to the target intermediate pressure Pm0 at the time of the cooling mode includes:
Pm/Pm0< P01, and controlling the opening of the second throttle valve EXV2 to be increased according to a third variable; p01 is more than or equal to Pm/Pm0< P02, and the opening of the second throttle valve EXV2 is controlled to be increased according to a fourth variable; p02 is more than or equal to Pm/Pm0 is more than or equal to P03 for controlling and maintaining the opening of the second throttle valve EXV 2; p03< Pm/Pm0< P04, and the opening of the second throttle valve EXV2 is controlled to be reduced according to a fourth variable; p04< Pm/Pm0, the control decreases the opening of the second throttle valve EXV2 according to a third variable; wherein P01< P02< P03< P04, the third variable is greater than the fourth variable. Wherein, the P01 value is 0.75-0.85, the P02 value is 0.85-0.95, the P03 value is 0.95-1.05, the P04 value is 1.15-1.2, the third variable is 20-40 steps, and the fourth variable is 8-20 steps.
In the embodiment of the invention, the ratio of the pressure Pm to the target intermediate pressure Pm0 is different, and the opening change amplitude of the second throttle valve EXV2 are different, so that the control precision of the second throttle valve EXV2 is improved, and the energy efficiency of the system is in a better energy efficiency range.
In the preferred embodiment of the invention, when the enhanced vapor injection system is in a heating mode, the first electromagnetic valve SV1 is closed, and the second electromagnetic valve SV2 is opened; when the outdoor environment temperature T1 is not less than a second preset temperature T02(T02 takes the value of minus 7-10 ℃), adjusting the opening of the first throttle valve EXV1 according to the comparison result of the return air superheat degree and the preset superheat degree range; when the outdoor environment temperature T1 is less than a second preset temperature T02, adjusting the opening of the second throttle valve EXV2 to a second initial opening, and determining the second initial opening according to the comparison result of the outdoor environment temperature T1 and the preset temperature range; and adjusts the opening degree of the second throttle valve EXV2 in accordance with the ratio of the pressure Pm to the target intermediate pressure Pm 0.
Through the mode, under different outdoor environment temperatures T1, the opening degree of the first throttle valve EXV1 or the opening degree of the second throttle valve EXV2 are adjusted in different modes, the state of the working medium entering the compressor 1 and the energy efficiency of the system can be considered, liquid impact on the compressor 1 is prevented, and the system is enabled to operate in a better energy efficiency range.
Specifically, in the heating mode, when the temperature is 0 ℃ < T4<7 ℃, the second initial opening is 56-320 steps; and P02 is more than or equal to Pm/Pm0 is more than or equal to P03, and the opening of a second throttle valve EXV2 is controlled to be increased according to a second variable; p03< Pm/Pm0 is not more than P04, and the opening degree of the second throttle valve EXV2 is maintained; p04< Pm/Pm0, and controls to decrease the opening of the second throttle valve EXV2 by the second variable;
when the temperature is 6 ℃ and T4 are less than or equal to 0 ℃, the second initial opening is 76-340 steps, Pm/Pm0 and P01, and the opening of a second throttle valve EXV2 is controlled to be reduced according to a first variable; p01 is more than or equal to Pm/Pm0< P02, and the opening of the second throttle valve EXV2 is controlled to be reduced according to a second variable; p02 is more than or equal to Pm/Pm0 is more than or equal to P03, and the opening degree of the second throttle valve EXV2 is controlled to be maintained at a second initial opening degree; p03< Pm/Pm0< P04, and the opening of the second throttle valve EXV2 is controlled to be increased according to a first variable;
when the temperature T4 is less than or equal to minus 6 ℃, the second initial opening degree is 96-360 steps; and Pm/Pm0< P01, the opening of the second throttle valve EXV2 is controlled to be reduced according to the first variable; Pm/Pm0< P01, and controls to decrease the opening of the second throttle valve EXV2 by a second variable; p01 is less than or equal to Pm/Pm0< P02, and the opening of the second throttle valve EXV2 is controlled to be continuously increased; p02 is more than or equal to Pm/Pm0 is more than or equal to P03 for controlling and maintaining the opening of the second throttle valve EXV 2; p03< Pm/Pm0< P04, and the opening of a second throttle valve EXV2 is controlled to be increased according to a second variable; p04< Pm/Pm0, the control increases the opening of the second throttle valve EXV2 according to a first variable; wherein the value of P01 is 0.75-0.85, the value of P02 is 0.85-0.95, the value of P03 is 0.95-1.05, the value of P04 is 1.15-1.2, and the first variable is larger than the second variable.
Through the mode, the second initial opening degree of the second throttle valve EXV2 is different, and the opening degree change amplitude of the second throttle valve EXV2 are different at different outdoor environment temperatures T1, so that the control precision of the second throttle valve EXV2 is improved, and the energy efficiency of the system is in a better energy efficiency range.
In a preferred embodiment of the present invention, the method further includes correcting the opening degrees of the first throttle EXV1 and the second throttle EXV2 according to a comparison result between the degree of superheat of the auxiliary circuit and a preset degree of superheat range, wherein the degree of superheat of the auxiliary circuit is a difference between an outlet temperature TA2 of the auxiliary circuit and an inlet temperature TA1 of the auxiliary circuit in the cooling or heating mode. Through the mode, the superheat degree of the auxiliary path can be ensured, and liquid return of the compressor 1 is prevented.
Specifically, the steps of correcting the opening degrees of the first throttle valve EXV1 and the second throttle valve EXV2 based on the comparison result of the degree of superheat of the bypass with the preset degree of superheat range include TA2-TA1< T03, adjusting the opening degree of the first throttle valve EXV1 based on the comparison result of the degree of superheat of the return air with the preset degree of superheat range, and closing the second throttle valve EXV 2. T03 is more than or equal to TA2-TA1 is more than or equal to T04, and the opening degree of the first throttle valve EXV1 and the opening degree of the second throttle valve EXV2 are maintained; t04 is more than or equal to TA2-TA1 is more than or equal to T05, the opening degree of the first throttle valve EXV1 is controlled to be reduced according to a second variable, and the opening degree of the second throttle valve EXV2 is maintained; t05< TA2-TA1, and controls to decrease the opening degree of the first throttle valve EXV1 by the first variable and maintain the opening degree of the second throttle valve EXV 2. Wherein, T03 takes on 1-3 ℃, T04 takes on 3-5 ℃ and T05 takes on 5-7 ℃.
In a preferred embodiment of the present invention, the present invention further includes an indoor fan provided corresponding to the indoor heat exchanger 2 and an outdoor fan provided corresponding to the outdoor heat exchanger. The storage module (not shown in the figure) stores the judgment values of T2\ T3B \ T1\ Th \ TA1\ TA2 and various control conditions detected by the temperature detection module in real time; the control module is a central processing unit which controls the frequency of the compressor 1, the rotating speed of the fan and various valves according to detected parameters.
Referring to fig. 4, according to an embodiment of the present invention, an operation method of an enhanced vapor injection system includes the following steps:
detecting an inlet temperature TA1 of the auxiliary road, an outlet temperature TA2 of the auxiliary road, an outdoor environment temperature T1, a middle temperature T2 of the indoor heat exchanger and a middle temperature T3B of the outdoor heat exchanger;
converting the pressure Pm of the working medium in a two-phase region of the pressure-enthalpy diagram according to the inlet temperature TA1 of the auxiliary circuit;
the opening degree of the first throttle valve EXV1 and/or the second throttle valve EXV2 is adjusted according to the comparison result of the outdoor ambient temperature T1 with the preset temperature and according to the comparison result of the ratio of the pressure Pm to the target intermediate pressure Pm0 with the preset ratio.
Further, in a preferred embodiment of the present invention, the method further includes; and correcting the opening degree of the first throttle valve EXV1 and the opening degree of the second throttle valve EXV2 according to the comparison result of the auxiliary road superheat degree and the preset superheat degree range, wherein the auxiliary road superheat degree is the difference between the outlet temperature TA2 of the auxiliary road and the inlet temperature TA1 of the auxiliary road.
Specifically, referring to fig. 5, the operation method of the enhanced vapor injection system further includes:
s1, the air conditioner enters a refrigerating or heating mode to operate after being electrified for the first time, the initial opening of the first throttle valve EXV1 is an initial opening A, the second throttle valve EXV2 is closed, the first electromagnetic valve SV1 and the second electromagnetic valve SV2 are closed, the indoor fan and the outdoor fan operate, and the compressor 1 is started for 3min in a delayed mode;
s2, judging the operation mode of the enhanced vapor injection system; if the enhanced vapor injection system is in the oil return or defrosting mode, the step S3 is operated; if the enhanced vapor injection system is in the heating mode, the step S4 is executed; if the enhanced vapor injection system is in the heating mode, the step S5 is executed;
s3, adjusting the opening of the first throttle valve EXV1 according to the return air superheat degree, closing the second throttle valve EXV2, the first electromagnetic valve SV1 and the second electromagnetic valve SV2, and if the defrosting or return oil exit condition is met during the period, recovering the previous operation mode and controlling; if the outdoor ambient temperature T1> the first preset temperature T01 in the cooling mode, the process proceeds to step S4, and if the outdoor ambient temperature T1< the first preset temperature T02 in the heating mode, the process proceeds to step S5;
s4: when the enhanced vapor injection system operates in a refrigeration mode, a first electromagnetic valve SV1 is opened, a second electromagnetic valve SV2 is closed, the outdoor environment temperature T1 detected by a temperature detection module is compared with a first preset temperature, if the outdoor environment temperature T1 is less than or equal to the first preset temperature T01, the step S3 is directly carried out, if the outdoor environment temperature T1 is greater than the first preset temperature T01, a second throttle valve EXV2 is adjusted to a first initial opening, and the opening of the second throttle valve EXV2 is adjusted according to the ratio of the pressure Pm of the working medium in a two-phase area of a pressure-enthalpy diagram and a target intermediate pressure Pm0 calculated by the inlet temperature TA1 of an auxiliary circuit; the opening degree of the first throttle valve EXV1 and the opening degree of the second throttle valve EXV2 are corrected according to the comparison result of the degree of superheat of the bypass and the preset degree of superheat range.
S5, when the enhanced vapor injection system operates in a heating mode, closing a first electromagnetic valve SV1 and opening a second electromagnetic valve SV 2; comparing the outdoor environment temperature T1 detected by the temperature detection module with a second preset temperature, directly entering step S3 if the outdoor environment temperature T1 is greater than or equal to the second preset temperature T02, adjusting a second throttle valve EXV2 to a second initial opening degree if the outdoor environment temperature T1 is less than the second preset temperature T02, and adjusting the opening degree of the second throttle valve EXV2 according to the ratio of the pressure Pm of the working medium in the two-phase region of the pressure-enthalpy diagram and the target intermediate pressure converted from the inlet temperature TA1 of the auxiliary circuit; the opening degree of the first throttle valve EXV1 and the opening degree of the second throttle valve EXV2 are corrected according to the comparison result of the degree of superheat of the bypass and the preset degree of superheat range.
Further, still include: when the system receives a shutdown signal, the compressor 1 stops running, the first throttle valve EXV1 and the second throttle valve EXV2 keep the current opening degree, the first electromagnetic valve SV1 and the second electromagnetic valve SV2 are closed, and the outdoor fan is delayed for 30s to be closed.
In the step S1, the air conditioner receives a cooling or heating operation signal after being initially powered on, the remote controller key or the key on the air conditioner control panel finishes entering the cooling or heating mode operation, the central processing unit sends a signal, the first throttle valve EXV1 is firstly cleared and closed in the step-500 and then opened to the initial opening A (step 120 and 400), the electronic expansion valve EXV1 is cleared and closed in the step-500, meanwhile, the first electromagnetic valve SV1 and the second electromagnetic valve SV2 are closed, the indoor and outdoor fans operate, and the compressor 1 is started for 3min in a delayed mode.
In step S2, the cpu determines which mode the system is currently in, and if the system is in the oil return or defrosting mode, the cpu proceeds to step S3, if the system is in the cooling mode, the cpu proceeds to step S4, and if the system is in the heating mode, the cpu proceeds to step S5.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An enhanced vapor injection system comprises a compressor, an indoor heat exchanger, an auxiliary heat exchanger, a first throttling valve and an outdoor heat exchanger which are sequentially communicated through pipelines and form a working medium circulation flow path, wherein the compressor is provided with an enhanced vapor injection air inlet; the auxiliary heat exchanger is provided with a main path and an auxiliary path, a second throttle valve is arranged between an outlet of the main path and an inlet of the auxiliary path, and an outlet of the auxiliary path is communicated with the enhanced vapor injection air inlet; its characterized in that, air injection enthalpy addition system still includes:
the temperature detection module is used for detecting the inlet temperature of the auxiliary road, the outlet temperature of the auxiliary road, the outdoor environment temperature T1, the middle temperature of the indoor heat exchanger and the middle temperature of the outdoor heat exchanger;
the data processing module is used for converting the pressure Pm of the working medium in a two-phase region of the pressure-enthalpy diagram according to the inlet temperature of the auxiliary road;
and the control module is used for adjusting the opening of the first throttle valve and/or the second throttle valve according to a comparison result of the outdoor environment temperature T1 and a preset temperature and a comparison result of a ratio of the pressure Pm and a target intermediate pressure Pm0 and a preset ratio.
2. The enhanced vapor injection system of claim 1, further comprising a first auxiliary line communicating between the first port of the main circuit and the inlet of the auxiliary circuit, a second auxiliary line communicating between the second port of the main circuit and the inlet of the auxiliary circuit, a first solenoid valve disposed between the first port and the second throttle valve, and a second solenoid valve disposed between the second port and the second throttle valve.
3. The enhanced vapor injection system of claim 2, further comprising a determination module that determines the mode of operation of the enhanced vapor injection system.
4. The enhanced vapor injection system according to claim 3, wherein when the enhanced vapor injection system is in an oil return or defrosting mode, the second throttle valve, the first electromagnetic valve and the second electromagnetic valve are closed, and the control module adjusts the opening degree of the first throttle valve according to a comparison result of the return air superheat degree and a preset superheat degree range; and switching the operation mode of the enhanced vapor injection system according to the comparison result of the outdoor environment temperature and the preset temperature.
5. The enhanced vapor injection system of claim 4, wherein when the enhanced vapor injection system is in a cooling mode, the first solenoid valve is opened and the second solenoid valve is closed; when the outdoor environment temperature T1 is not higher than a first preset temperature, adjusting the opening of the first throttle valve according to the return air superheat degree; when the outdoor environment temperature T1 is lower than a first preset temperature, adjusting the opening of the second throttle valve to a first initial opening; and the opening degree of the second throttle valve is adjusted according to the ratio of the pressure Pm to the target intermediate pressure Pm 0.
6. The enhanced vapor injection system of claim 5, wherein when the enhanced vapor injection system is in a heating mode, the first solenoid valve is closed and the second solenoid valve is opened; when the outdoor environment temperature T1 is not less than a second preset temperature, adjusting the opening of the first throttle valve according to the return air superheat degree; when the outdoor environment temperature T1 is lower than a second preset temperature, adjusting the opening of a second throttle valve to a second initial opening, and determining the second initial opening according to the comparison result of the outdoor environment temperature T1 and a preset temperature range; and the opening degree of the second throttle valve is adjusted according to the ratio of the pressure Pm to the target intermediate pressure Pm 0.
7. The enhanced vapor injection system of claim 6, wherein the second initial opening is 56-320 steps at 0 ℃ < T1<7 ℃; -6 ℃ < T1 ≦ 0 ℃, the second initial opening is 76-340 steps; when the temperature T1 is less than or equal to minus 6 ℃, the second initial opening degree is 96-360 steps.
8. The enhanced vapor injection system according to claim 5 or 6, further comprising correcting the opening degree of the first throttle valve and the second throttle valve according to the comparison result of the degree of superheat of the auxiliary circuit and a preset degree of superheat range in the cooling or heating mode, wherein the degree of superheat of the auxiliary circuit is the difference between the outlet temperature of the auxiliary circuit and the inlet temperature of the auxiliary circuit.
9. A method of operating an enhanced vapor injection system according to any one of claims 2 to 9, comprising the steps of:
detecting the inlet temperature of the auxiliary road, the outlet temperature of the auxiliary road, the outdoor environment temperature T1, the middle temperature of an indoor heat exchanger and the middle temperature of an outdoor heat exchanger;
converting the pressure Pm of the working medium in a two-phase region of a pressure-enthalpy diagram according to the inlet temperature of the auxiliary circuit;
and adjusting the opening degree of the first throttle valve and/or the second throttle valve according to a comparison result of the outdoor environment temperature T1 and a preset temperature and a comparison result of the ratio of the pressure Pm and the target middle pressure Pm0 and a preset ratio.
10. The method of operating a enhanced vapor injection system of claim 9, further comprising: and correcting the opening degree of the first throttle valve and the opening degree of the second throttle valve according to the comparison result of the auxiliary superheat degree and a preset superheat degree range.
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Cited By (1)
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