CN114234280B - Fresh air conditioning unit and control method thereof - Google Patents

Fresh air conditioning unit and control method thereof Download PDF

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Publication number
CN114234280B
CN114234280B CN202111566140.1A CN202111566140A CN114234280B CN 114234280 B CN114234280 B CN 114234280B CN 202111566140 A CN202111566140 A CN 202111566140A CN 114234280 B CN114234280 B CN 114234280B
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China
Prior art keywords
way valve
heat exchanger
port
controlling
air conditioning
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CN114234280A (en
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陈桂福
邓李娇
陈远远
聂宝平
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • 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
    • 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]
    • Y02B30/56—Heat recovery units

Abstract

The invention provides a fresh air conditioning unit and a control method thereof, wherein the fresh air conditioning unit comprises an air conditioning system and a heat recovery system, wherein the air conditioning system comprises a first heat exchanger and a second heat exchanger, the first heat exchanger is controllably communicated with the second heat exchanger through a throttling device, the heat recovery system comprises a first heat pipe heat exchanger and a second heat pipe heat exchanger, the first heat pipe heat exchanger is controllably communicated with the second heat pipe heat exchanger through a second three-way valve, and a first three-way valve and a third three-way valve are arranged on pipelines among the first heat pipe heat exchanger, the first heat exchanger, the second heat pipe heat exchanger and the second heat pipe heat exchanger for switching the flow direction of a refrigerant. According to the invention, the refrigerant in the air conditioning system and the heat recovery system can adjust the charging amount between the refrigerant in the heat recovery system and the refrigerant in the air conditioning system under some working conditions, and the operation energy efficiency, the heat recovery efficiency and the equipment operation reliability of the air conditioning unit can be improved.

Description

Fresh air conditioning unit and control method thereof
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to a fresh air conditioning unit and a control method thereof.
Background
The heat pipe heat exchanger can effectively recover the cold/heat quantity of indoor exhaust air and improve the system operation energy efficiency, but the evaporator and the condenser all use fresh air for heat exchange, the annual operation working condition range is large, the optimal refrigerant charge quantity of the heat recovery system and the air conditioning system during the refrigeration and heating operation is different, and the system performance cannot be fully exerted.
Disclosure of Invention
Therefore, the invention provides a fresh air conditioning unit and a control method thereof, which can overcome the defect that the performance of an equipment system can not be fully exerted because the refrigerant in a system related to the fresh air conditioning unit in the related technology can not be adjusted according to the operation condition of the equipment.
In order to solve the problems, the invention provides a fresh air conditioning unit, which comprises an air conditioning system and a heat recovery system, wherein the air conditioning system comprises a first heat exchanger and a second heat exchanger, a second port of the first heat exchanger is in controllable communication with a first port of the second heat exchanger through a throttling device, the heat recovery system comprises a first heat pipe heat exchanger and a second heat pipe heat exchanger, a second port of the first heat pipe heat exchanger is in controllable communication with a first port of the second heat pipe heat exchanger through a second three-way valve, the first heat pipe heat exchanger and the first heat exchanger are sequentially arranged in an indoor exhaust air duct along the direction of exhaust air flow, the second heat exchanger and the second heat pipe heat exchanger are sequentially arranged in a fresh air supply duct along the direction of fresh air flow, the first port of the first heat exchanger and the second port of the second heat pipe heat exchanger are in switchable communication through a first three-way valve flow path, and the first port of the first heat exchanger can be communicated with one of an air inlet or an air outlet of the compressor, and the second port of the second heat pipe heat exchanger, the second port of the second heat exchanger, the air inlet or the air outlet of the compressor can be communicated in a switchable manner through a third three-way valve flow path.
In some embodiments, the fresh air supply duct has a fresh air inlet, and a fresh air filter is arranged in the fresh air inlet; and/or the indoor exhaust air duct is provided with a return air inlet, and a return air filter is arranged in the return air inlet.
In some embodiments, the fresh air conditioning unit further comprises a four-way valve, the exhaust port of the compressor is communicated with a first port of the four-way valve, a first port of the first heat exchanger is communicated with a second port of the four-way valve, the suction port of the compressor is communicated with a third port of the four-way valve, and a second port of the second heat exchanger is controllably communicated with a fourth port of the four-way valve through the third three-way valve.
The invention also provides a control method of the fresh air conditioning unit, which is used for the fresh air conditioning unit and comprises the following steps:
acquiring an operation mode of a fresh air conditioning unit;
acquiring a judgment parameter corresponding to the operation mode according to the acquired operation mode;
and controlling and switching flow paths of a throttling device, a first three-way valve, a second three-way valve, a third three-way valve and a four-way valve in the fresh air conditioning unit according to the size relation between the judgment parameters and the corresponding preset values so as to realize the transfer adjustment of the refrigerant charge amount between the air conditioning system and the heat recovery system.
In some embodiments, when the operation mode is an air supply mode, acquiring the judgment parameter corresponding to the operation mode according to the acquired operation mode includes acquiring an air supply temperature twain, an air return temperature tsingnner and a fresh air inlet temperature tsingnner;
when | T outer ring-T inner ring | Y and | T outer ring-T air supply | T outer ring-T inner ring | X, obtaining a refrigerant pressure P1 in the first heat-pipe heat exchanger;
when the P1 is less than the P standard, controlling and switching the flow paths of a throttling device, a first three-way valve, a second three-way valve, a third three-way valve and a four-way valve in the fresh air conditioning unit to increase the refrigerant charge amount in the heat recovery system so as to increase the refrigerant pressure in the first heat pipe heat exchanger; alternatively, the first and second electrodes may be,
when the P1 is larger than or equal to the P standard, the flow paths of the throttling device, the first three-way valve, the second three-way valve, the third three-way valve and the four-way valve in the fresh air conditioning unit are controlled and switched to reduce the refrigerant charge amount in the heat recovery system so as to reduce the refrigerant pressure in the first heat pipe heat exchanger.
In some embodiments, controlling to switch the flow paths of the throttling device, the first three-way valve, the second three-way valve, the third three-way valve, and the four-way valve in the fresh air handling unit to increase the refrigerant charge in the heat recovery system when P1 < P criteria comprises:
controlling the first three-way valve to communicate the first port of the first heat exchanger with the first port of the first heat pipe heat exchanger, controlling the second three-way valve to communicate the second port of the first heat pipe heat exchanger with the first port of the second heat pipe heat exchanger, controlling the third three-way valve to communicate the second port of the second heat exchanger with the fourth port of the four-way valve, controlling the four-way valve to enable the exhaust gas of the compressor to enter the first heat exchanger, and controlling the throttling device to be cut off; alternatively, the first and second electrodes may be,
when the P1 is larger than or equal to the P standard, the control switching of the flow paths of the throttling device, the first three-way valve, the second three-way valve, the third three-way valve and the four-way valve in the fresh air conditioning unit to reduce the refrigerant charge in the heat recovery system comprises the following steps:
and controlling the first three-way valve to communicate the second port of the second heat pipe heat exchanger with the first port of the first heat pipe heat exchanger, controlling the second three-way valve to communicate the second port of the first heat pipe heat exchanger with the first port of the second heat pipe heat exchanger, controlling the third three-way valve to communicate the second port of the second heat pipe heat exchanger with the fourth port of the four-way valve, controlling the four-way valve to enable the exhaust gas of the compressor to enter the first heat exchanger, and controlling the throttling device to cut off.
In some embodiments, the supply air temperature twain, the return air temperature tlower inner ring and the fresh air inlet temperature tsower outer ring are obtained after the supply air mode is operated for the first preset time.
In some embodiments, when the operation mode is a cooling mode, acquiring a judgment parameter corresponding to the operation mode according to the acquired operation mode includes acquiring an air supply temperature tfiew and an operation current in of a compressor;
when in is larger than i standard 1, controlling and switching flow paths of a throttling device, a first three-way valve, a second three-way valve, a third three-way valve and a four-way valve in the fresh air conditioning unit to reduce the refrigerant charge amount in the air conditioning system so as to reduce the refrigerant pressure in the first heat exchanger; alternatively, the first and second liquid crystal display panels may be,
when in is less than or equal to i standard 1 and T air supply is greater than T standard 1, controlling and switching flow paths of a throttling device, a first three-way valve, a second three-way valve, a third three-way valve and a four-way valve in the fresh air conditioning unit to increase the refrigerant filling amount in the air conditioning system so as to increase the refrigerant pressure in the first heat exchanger.
In some embodiments, when the operation mode is a heating mode, acquiring a judgment parameter corresponding to the operation mode according to the acquired operation mode includes acquiring an air supply temperature tflown and an operation current in of a compressor;
when in is larger than i standard 2, controlling and switching flow paths of a throttling device, a first three-way valve, a second three-way valve, a third three-way valve and a four-way valve in the fresh air conditioning unit to reduce the refrigerant charge amount in the air conditioning system so as to reduce the refrigerant pressure in the first heat exchanger; alternatively, the first and second electrodes may be,
when in is less than or equal to i standard 2 and T air supply is less than T standard 2, controlling and switching flow paths of a throttling device, a first three-way valve, a second three-way valve, a third three-way valve and a four-way valve in the fresh air conditioning unit to increase the refrigerant charge amount in the air conditioning system so as to increase the refrigerant pressure in the first heat exchanger.
In some embodiments, when the operation mode is a cooling mode or a heating mode, the compressor in the air conditioning system is controlled to operate at a preset frequency D and a preset opening E for a second preset time, and then an air supply temperature twp and an operation current in of the compressor are obtained.
The invention also provides a control method of the fresh air conditioning unit, which is used for controlling the fresh air conditioning unit and comprises the following steps:
acquiring an operation mode of a fresh air conditioning unit;
and controlling and switching the flow paths of the throttling device, the first three-way valve, the second three-way valve, the third three-way valve and the four-way valve in the fresh air conditioning unit and the start and stop of the compressor according to the obtained operation mode.
In some embodiments of the present invention, the substrate is,
and when the operation mode is an air supply mode, controlling the compressor to stop operating or keep in a stop state, controlling the first three-way valve to enable the first port of the first heat pipe heat exchanger to be communicated with the second port of the second heat pipe heat exchanger, controlling the second three-way valve to enable the second port of the first heat pipe heat exchanger to be communicated with the first port of the second heat pipe heat exchanger, and controlling the third three-way valve to enable the second port of the second heat exchanger to be communicated with an air exhaust port or an air suction port of the compressor.
In some embodiments of the present invention, the substrate is,
and when the operation mode is a comfortable refrigeration mode, on the basis of the air supply mode, the compressor is further controlled to start and operate, the four-way valve is controlled to enable an air suction port of the compressor to be communicated with the second port of the second heat exchanger, an air exhaust port of the compressor to be communicated with the first port of the first heat exchanger, and the throttling device is controlled to be in a circulation state.
In some embodiments of the present invention, the substrate is,
when the operation mode is a common refrigeration mode, controlling the compressor to start or keep operating, controlling the first three-way valve to enable the first port of the first heat exchanger to be communicated with the first port of the first heat pipe heat exchanger, controlling the second three-way valve to enable the second port of the first heat pipe heat exchanger to be communicated with the second port of the first heat exchanger, controlling the third three-way valve to enable the second port of the second heat exchanger to be communicated with the suction port of the compressor, controlling the four-way valve to enable the exhaust port of the compressor to be communicated with the first port of the first heat exchanger, and controlling the throttling device to be in a circulation state.
In some embodiments of the present invention, the substrate is,
when the operation mode is a heating mode, controlling the compressor to start or keep operating, controlling the first three-way valve to enable the first port of the first heat exchanger to be communicated with the first port of the first heat pipe heat exchanger, controlling the second three-way valve to enable the second port of the first heat pipe heat exchanger to be communicated with the second port of the first heat exchanger, controlling the third three-way valve to enable the second port of the second heat exchanger to be communicated with the exhaust port of the compressor, controlling the four-way valve to enable the air suction port of the compressor to be communicated with the first port of the first heat exchanger, and controlling the throttling device to be in a circulation state.
According to the fresh air conditioning unit and the control method thereof, the first three-way valve, the second three-way valve and the third three-way valve are arranged among the related components, and the corresponding flow paths are controlled and switched, so that the refrigerant in the air conditioning system and the heat recovery system can adjust the filling amount between the refrigerant in the heat recovery system and the refrigerant in the air conditioning system under some working conditions, the filling amount of the refrigerant in the air conditioning system and the heat recovery system is favorably enabled to be in the optimal state, the operation energy efficiency, the heat recovery efficiency and the equipment operation reliability of the air conditioning unit can be improved, and the liquid impact condition of working conditions such as low-temperature refrigeration, ultralow-temperature heating and the like can be effectively avoided.
Drawings
Fig. 1 is a schematic diagram of an internal structure of a fresh air handling unit according to an embodiment of the present invention (including a connection relationship and a relative position relationship of components);
FIG. 2 is a schematic diagram of the refrigerant flow of the fresh air conditioning unit of FIG. 1 operating in a normal cooling mode;
FIG. 3 is a schematic diagram of refrigerant flow through the fresh air conditioning unit of FIG. 1 operating in a comfort cooling mode/supply mode;
FIG. 4 is a schematic diagram of the refrigerant flow when the fresh air conditioning unit of FIG. 1 is operating in a heating mode;
FIG. 5 is a schematic diagram of refrigerant flow through the fresh air conditioning unit of FIG. 1 during an increase in refrigerant charge to the heat recovery system;
FIG. 6 is a schematic refrigerant flow diagram of the fresh air conditioning unit of FIG. 1 with a reduced refrigerant charge to the heat recovery system;
FIG. 7 is a schematic diagram of the control logic for adjusting the refrigerant charge in the heat recovery system and the air conditioning system during the operation of the fresh air conditioning unit in the air supply mode of the present invention;
FIG. 8 is a schematic diagram of the control logic for adjusting refrigerant charge in the heat recovery system and the air conditioning system during the heating mode of operation of the fresh air conditioning unit of the present invention;
fig. 9 is a schematic diagram of control logic for adjusting refrigerant charge in the heat recovery system and the air conditioning system during the operation cooling mode (including the normal cooling mode or the comfort cooling mode) of the fresh air conditioning unit according to the present invention.
The reference numerals are represented as:
1. a first heat pipe heat exchanger; 2. a return air filter; 3. an air return inlet; 4. a return air detection sensor; 5. a second heat pipe heat exchanger; 6. an air supply outlet; 7. an air supply detection sensor; 8. a fresh air fan; 9. a second heat exchanger; 10. a third three-way valve (capable of detecting the pressure value of each branch); 11. a fresh air detection sensor; 12. a controller; 13. a fresh air filter; 14. a fresh air inlet; 15. a compressor; 16. an exhaust outlet; 17. a four-way valve; 18. a gas-liquid separator; 19. a first heat exchanger; 20. a throttling device; 21. an exhaust fan; 22. a second three-way valve (capable of detecting the pressure value of each branch); 23. the first three-way valve (can detect the pressure value of each branch).
Detailed Description
With reference to fig. 1 to 9 in combination, specifically, as shown in fig. 1, according to an embodiment of the present invention, a fresh air conditioning unit is provided, which includes an air conditioning system and a heat recovery system, wherein the air conditioning system includes a first heat exchanger 19 and a second heat exchanger 9, a second port of the first heat exchanger 19 is in controllable communication with a first port of the second heat exchanger 9 through a throttle device 20, the heat recovery system includes a first heat pipe exchanger 1 and a second heat pipe exchanger 5, a second port of the first heat pipe exchanger 1 is in controllable communication with a first port of the second heat pipe exchanger 5 through a second three-way valve 22, the first heat pipe exchanger 1 and the first heat exchanger 19 are sequentially disposed in an indoor exhaust air duct along an exhaust air flow direction, the second heat exchanger 9 and the second heat pipe exchanger 5 are sequentially disposed in a fresh air supply duct along a fresh air flow direction, the first port of the first heat pipe exchanger 1, the first port of the first heat exchanger 19 and the second port of the second heat pipe exchanger 5 are in flow path switchable communication through a first three-way valve 23, the first port of the first heat exchanger 19 can be in flow path switchable communication with one of an air inlet or an air outlet of the compressor 15, and the second port of the second heat pipe exchanger 5, the second port of the second heat exchanger 9, the other of the air inlet or the air outlet of the compressor 15 is in flow path switchable communication through a third three-way valve 10. In the technical scheme, the first three-way valve 23, the second three-way valve 22 and the third three-way valve 10 are arranged among related components, and corresponding flow paths are controlled and switched, so that the refrigerant in the air conditioning system and the heat recovery system can adjust the filling amount of the refrigerant in the heat recovery system and the air conditioning system under some working conditions, the filling amount of the refrigerant in the air conditioning system and the heat recovery system is in the optimal state (the specific optimal state can obtain related data through simulating the working conditions), the operation energy efficiency, the heat recovery efficiency and the equipment operation reliability of the air conditioning unit can be improved, and the liquid impact condition of the working conditions such as low-temperature refrigeration, ultralow-temperature heating and the like can be effectively avoided. Experiments prove that the energy efficiency of an air conditioning system (namely, refrigeration/heating) of the air conditioning unit adopting the technical scheme of the invention can be improved by 5-15%, and the energy efficiency of a heat recovery system can be improved by 5-20%. The first, second, and third three- way valves 23, 22, and 10 may be collectively referred to as a valve device.
The fresh air supply duct is provided with a fresh air inlet 14, and a fresh air filter 13 is arranged in the fresh air inlet 14; and/or the indoor exhaust air duct is provided with a return air inlet 3, and a return air filter 2 is arranged in the return air inlet 3 and can be used for carrying out necessary purification on the fresh air or the return air flow entering the fresh air supply air duct and the indoor exhaust air duct. The fresh air conditioning unit further comprises a four-way valve 17, an exhaust port of the compressor 15 is communicated with a first port of the four-way valve 17, a first port of the first heat exchanger 19 is communicated with a second port of the four-way valve 17, an air suction port of the compressor 15 is communicated with a third port of the four-way valve 17, a second port of the second heat exchanger 9 is controllably communicated with a fourth port of the four-way valve 17 through the third three-way valve 10, and switching of the fresh air conditioning unit between refrigerating and heating working conditions can be achieved through control switching of a communication flow path of the four-way valve 17.
According to an embodiment of the present invention, there is also provided a control method for a fresh air handling unit, for controlling the fresh air handling unit, including the steps of:
acquiring an operation mode of a fresh air conditioning unit;
and controlling and switching the flow paths of the throttling device 20, the first three-way valve 23, the second three-way valve 22, the third three-way valve 10 and the four-way valve 17 in the fresh air conditioning unit and the start and stop of the compressor 15 according to the obtained operation mode.
As shown in fig. 3, when the operation mode is the air blowing mode, the compressor 15 is controlled to stop operating or to maintain the shutdown state, the first three-way valve 23 is controlled to communicate the first port of the first heat pipe heat exchanger 1 with the second port of the second heat pipe heat exchanger 5, the second three-way valve 22 is controlled to communicate the second port of the first heat pipe heat exchanger 1 with the first port of the second heat pipe heat exchanger 5, and the third three-way valve 10 is controlled to communicate the second port of the second heat exchanger 9 with the air outlet or the air inlet of the compressor 15. Specifically, the compressor 15 stops operating, and the first heat pipe exchanger 1 and the second heat pipe exchanger 5 form a circulation operation according to the indoor and outdoor temperature difference, specifically: the refrigerant absorbs the cold energy of indoor exhaust air at the first heat pipe exchanger 1 and condenses into liquid state, flows to the second heat pipe exchanger 5 through the second three-way valve 22, absorbs the heat of outdoor fresh air at the second heat pipe exchanger to become vapor state, and then flows to the first heat pipe exchanger 1 to form circulation (the operation principle is the operation principle when outdoor heat and indoor cold are carried out in summer, and the circulation flow direction of the heat recovery system is opposite in winter). In the process, outdoor fresh air enters from the fresh air inlet 14, is filtered and purified through the fresh air filter 13, is sent to the second heat pipe heat exchanger 5 through the fresh air fan 8, is cooled at the second heat pipe heat exchanger 5, and is sent to an indoor room from the air supply outlet 6. Indoor exhaust air enters from the return air inlet 3, is filtered and purified through the return air filter 2, then absorbs heat of a refrigerant at the first heat pipe heat exchanger 1, and is sent to the exhaust air outlet 16 through the exhaust air fan 21 (the operation principle of outdoor heat in summer and indoor cold in winter, the second heat pipe heat exchanger 5 of the heat recovery system is used for heating air, and the first heat pipe heat exchanger 1 is used for cooling air in winter).
As shown in fig. 3, when the operation mode is the comfort cooling mode, the compressor 15 is further controlled to start operation on the basis of the air supply mode, and the four-way valve 17 is controlled to communicate the air suction port of the compressor 15 with the second port of the second heat exchanger 9, communicate the air discharge port of the compressor 15 with the first port of the first heat exchanger 19, and control the throttling device 20 to be in a flow state. Specifically, after being sucked from the air suction port of the compressor 15, the low-pressure low-temperature refrigerant is compressed into high-temperature high-pressure vapor refrigerant by the compressor and then discharged from the air exhaust port, and then flows through the first heat exchanger 19 through the four-way valve 17 for condensation heat exchange, and is cooled into high-pressure medium-temperature refrigerant, and then is changed into low-pressure low-temperature refrigerant through the throttling device 20, the refrigerant cools and dehumidifies the air supply at the second heat exchanger 9, the refrigerant absorbs heat and evaporates into low-pressure low-temperature gas, and then enters the gas-liquid separator 18 through the four-way valve 17, and the gaseous refrigerant is led to the air suction port of the compressor 15 to complete a refrigeration cycle. The refrigerant absorbs the cold energy of indoor exhaust air at the first heat pipe exchanger 1 and is condensed into liquid state, flows to the second heat pipe exchanger 5 through the second three-way valve 22, absorbs the heat of outdoor fresh air at the second heat pipe exchanger to become vapor state, and then flows to the first heat pipe exchanger 1 to form heat recovery circulation. In the process, outdoor fresh air enters from a fresh air inlet 14, is filtered and purified through a fresh air filter 13, is cooled and dehumidified at the second heat exchanger 9, is communicated to the second heat pipe heat exchanger 5 through a fresh air fan 8, absorbs refrigerant heat at the second heat pipe heat exchanger by low-temperature fresh air, enables the temperature and the humidity of the air to be close to the human body comfort range, and is sent to an indoor room from an air supply outlet 6. Indoor air enters from a return air inlet 3, is filtered and purified through a return air filter 2, absorbs cold energy of a refrigerant at a first heat pipe heat exchanger 1, then absorbs heat through a first heat exchanger 19 after running through an exhaust fan 21, and then is sent to the outside from an exhaust outlet 16.
Referring to fig. 2, when the operation mode is the normal cooling mode, the compressor 15 is controlled to start or maintain operation, the first three-way valve 23 is controlled to communicate the first port of the first heat exchanger 19 with the first port of the first heat pipe heat exchanger 1, the second three-way valve 22 is controlled to communicate the second port of the first heat pipe heat exchanger 1 with the second port of the first heat exchanger 19, the third three-way valve 10 is controlled to communicate the second port of the second heat exchanger 9 with the suction port of the compressor 15, the four-way valve 17 is controlled to communicate the exhaust port of the compressor 15 with the first port of the first heat exchanger 19, and the throttling device 20 is controlled to be in a flow state. Specifically, after being sucked from an air suction port of the compressor 15, a low-pressure low-temperature refrigerant is compressed into a high-temperature high-pressure vaporous refrigerant by the compressor and then discharged from an air exhaust port, the high-temperature high-pressure vaporous refrigerant simultaneously flows through the first heat exchanger 19 and the first heat pipe heat exchanger 1 through the four-way valve 17 to be subjected to condensation heat exchange and is cooled into a high-pressure medium-temperature refrigerant, the high-pressure medium-temperature high-temperature vaporized refrigerant is changed into a low-pressure low-temperature refrigerant through the throttling device 20, the refrigerant cools and dehumidifies air supplied by the second heat exchanger 9, the refrigerant absorbs heat and is evaporated into low-pressure low-temperature gas, the low-pressure low-temperature gas enters the gas-pressure gas-liquid separator 18 through the four-way valve 17, and the gaseous refrigerant is led to the air suction port of the compressor 15 to complete a refrigeration cycle. In the process, outdoor fresh air enters from the fresh air inlet 14, is filtered and purified through the fresh air filter 13, is cooled and dehumidified at the second heat exchanger 9, and is led to the air supply outlet 6 through the operation of the fresh air fan 8.
Referring to fig. 4, when the operation mode is a heating mode, the compressor 15 is controlled to start or maintain operation, the first three-way valve 23 is controlled to communicate the first port of the first heat exchanger 19 with the first port of the first heat pipe exchanger 1, the second three-way valve 22 is controlled to communicate the second port of the first heat pipe exchanger 1 with the second port of the first heat exchanger 19, the third three-way valve 10 is controlled to communicate the second port of the second heat exchanger 9 with the exhaust port of the compressor 15, and the four-way valve 17 is controlled to communicate the suction port of the compressor 15 with the first port of the first heat exchanger 19, so that the throttling device 20 is controlled to be in a flow state. Specifically, after being sucked from an air suction port of the compressor 15, a low-pressure low-temperature refrigerant is compressed into a high-temperature high-pressure vaporous refrigerant by the compressor and then discharged from an air outlet, flows through the second heat exchanger 9 through the four-way valve 17 to heat fresh air, is throttled and cooled by the throttling device 20, releases cold to the air in the first heat pipe heat exchanger 1 and the first heat exchanger 19 at the same time, then enters the gas-liquid separator 18, and finally enters the air suction port of the compressor 15 through the four-way valve 17 to complete a heating cycle. Meanwhile, outdoor fresh air enters from a fresh air inlet 14, is filtered and purified through a fresh air filter 13, is heated at the second heat exchanger 9 to rise the temperature, and is led to the air supply outlet 6 through the operation of a fresh air fan 8. Indoor air enters from a return air inlet 3, is filtered and purified through a return air filter 2, firstly releases heat for the first time through a first heat pipe heat exchanger 1, then releases heat for the second time through a first heat exchanger 19 after running through an exhaust fan 21, and then sends indoor exhaust air to the outdoor through an exhaust outlet 16.
Referring to fig. 5 to 9, in the operation process of the fresh air conditioning unit, the amounts of refrigerant charge in the air conditioning system and the heat recovery system may be adjusted according to actual conditions, and specifically, the following steps may be adopted:
acquiring an operation mode of a fresh air conditioning unit;
acquiring a judgment parameter corresponding to the operation mode according to the acquired operation mode;
and controlling and switching the flow paths of the throttling device 20, the first three-way valve 23, the second three-way valve 22, the third three-way valve 10 and the four-way valve 17 in the fresh air conditioning unit according to the size relationship between the judgment parameters and the corresponding preset values so as to realize the transfer adjustment of the refrigerant charge amount between the air conditioning system and the heat recovery system.
Specifically referring to fig. 7, when the operation mode is the air supply mode, acquiring the judgment parameters corresponding to the operation mode according to the acquired operation mode includes acquiring an air supply temperature twain, an air return temperature tsingnner and a fresh air inlet temperature tsingnner; when | T outer ring-T inner ring | Y and | T outer ring-T air supply | T outer ring-T inner ring | X, obtaining a refrigerant pressure P1 in the first heat-pipe heat exchanger 1; when the P1 is less than the P standard, controlling and switching the flow paths of the throttling device 20, the first three-way valve 23, the second three-way valve 22, the third three-way valve 10 and the four-way valve 17 in the fresh air conditioning unit to increase the refrigerant charge amount in the heat recovery system so as to increase the refrigerant pressure in the first heat pipe heat exchanger 1; or when the P1 is greater than or equal to the P standard, controlling and switching the flow paths of the throttling device 20, the first three-way valve 23, the second three-way valve 22, the third three-way valve 10 and the four-way valve 17 in the fresh air conditioning unit to reduce the refrigerant charge in the heat recovery system so as to reduce the refrigerant pressure in the first heat pipe heat exchanger 1.
When P1 < P standard, controlling and switching the flow paths of the throttling device 20, the first three-way valve 23, the second three-way valve 22, the third three-way valve 10 and the four-way valve 17 in the fresh air conditioning unit to increase the refrigerant charge amount in the heat recovery system comprises: controlling the first three-way valve 23 to communicate the first port of the first heat exchanger 19 with the first port of the first heat pipe heat exchanger 1, controlling the second three-way valve 22 to communicate the second port of the first heat pipe heat exchanger 1 with the first port of the second heat pipe heat exchanger 5, controlling the third three-way valve 10 to communicate the second port of the second heat exchanger 9 with the fourth port of the four-way valve 17, controlling the four-way valve 17 to enable the exhaust gas of the compressor 15 to enter the first heat exchanger 19, and controlling the throttling device 20 to cut off; or, when the P1 is greater than or equal to the P standard, the controlling and switching the flow paths of the throttling device 20, the first three-way valve 23, the second three-way valve 22, the third three-way valve 10 and the four-way valve 17 in the fresh air conditioning unit to reduce the refrigerant charge in the heat recovery system comprises: controlling the first three-way valve 23 to communicate the second port of the second heat pipe heat exchanger 5 with the first port of the first heat pipe heat exchanger 1, controlling the second three-way valve 22 to communicate the second port of the first heat pipe heat exchanger 1 with the first port of the second heat pipe heat exchanger 5, controlling the third three-way valve 10 to communicate the second port of the second heat pipe heat exchanger 5 with the fourth port of the four-way valve 17, controlling the four-way valve 17 to enable the exhaust gas of the compressor 15 to enter the first heat exchanger 19, and controlling the throttling device 20 to cut off.
Referring specifically to fig. 5, at this time, the throttling device 20 is cut off, and the second heat pipe exchanger 5 and the third three-way valve 10 are not communicated. The refrigerant in the second heat exchanger 9 flows through the third three-way valve 10 and the four-way valve 17 to the gas-liquid separator 18, is sucked into the compressor 15, is discharged from the compressor discharge port, and flows through the four-way valve 17 to the first heat exchanger 19 and the first heat pipe heat exchanger 1 at the same time. The compressor 15 pumps the refrigerant in the second heat exchanger 9 to the first heat pipe exchanger 1, the second heat pipe exchanger 5 and the first heat exchanger 19, respectively, so as to adjust the refrigerant charge of each system. After the adjustment is finished, all the valve devices and the throttling device are switched back to the original operation device.
Referring to fig. 6, the expansion device 20 blocks the flow of refrigerant. The refrigerant in the first heat pipe heat exchanger 1 and the second heat pipe heat exchanger 5 flows to the gas-liquid separator 18 through the third three-way valve 10 and the four-way valve 17, is sucked into the compressor 15, is discharged from the compressor discharge port, and flows to the first heat exchanger 19 through the four-way valve 17. The compressor 15 will always draw the refrigerant in the first heat pipe exchanger 1 and the second heat pipe exchanger 5 to converge it at the position of the first heat exchanger 19, thereby adjusting the refrigerant charge of each system. After the adjustment is finished, all the valve devices and the throttling devices are switched back to the original operation device.
In some embodiments, the air supply temperature twain, the return air temperature T inner ring and the fresh air inlet temperature T outer ring are acquired after the air supply mode is operated for the first preset time, so that the measurement of each air temperature parameter is more accurate and stable.
Referring to fig. 8, when the operation mode is the cooling mode, acquiring the judgment parameter corresponding to the operation mode according to the acquired operation mode includes acquiring an air supply temperature twain and an operation current in of the compressor 15; when in is larger than i standard 1, controlling and switching the flow paths of a throttling device 20, a first three-way valve 23, a second three-way valve 22, a third three-way valve 10 and a four-way valve 17 in the fresh air conditioning unit to reduce the refrigerant charging amount in the air conditioning system so as to reduce the refrigerant pressure in the first heat exchanger 19; or, when in is less than or equal to i standard 1 and T air supply is greater than T standard 1, controlling and switching the flow paths of the throttling device 20, the first three-way valve 23, the second three-way valve 22, the third three-way valve 10 and the four-way valve 17 in the fresh air conditioning unit to increase the refrigerant charge amount in the air conditioning system, so as to increase the refrigerant pressure in the first heat exchanger 19 (i.e. the first P heat exchanger in fig. 8 or 9). The increase or decrease of the refrigerant charge is the same as the control in the blowing mode, and will not be described herein.
Referring to fig. 9, when the operation mode is the heating mode, acquiring the determination parameter corresponding to the operation mode according to the acquired operation mode includes acquiring an air supply temperature tbf air supply and an operation current in of the compressor 15; when in is larger than i standard 2, controlling and switching the flow paths of a throttling device 20, a first three-way valve 23, a second three-way valve 22, a third three-way valve 10 and a four-way valve 17 in the fresh air conditioning unit to reduce the refrigerant charging amount in the air conditioning system so as to reduce the refrigerant pressure in the first heat exchanger 19; or when in is less than or equal to i standard 2 and T air supply is less than T standard 2, controlling and switching the flow paths of the throttling device 20, the first three-way valve 23, the second three-way valve 22, the third three-way valve 10 and the four-way valve 17 in the fresh air conditioning unit to increase the refrigerant charge amount in the air conditioning system so as to increase the refrigerant pressure in the first heat exchanger 19. The increase or decrease of the refrigerant charge is the same as the control in the blowing mode, and will not be described herein.
In some embodiments, when the operation mode is a cooling mode or a heating mode, the compressor 15 in the air conditioning system is controlled to operate at a preset frequency D and a preset opening E for a second preset time, and then the supply air temperature tway and the operation current in of the compressor 15 are obtained, so that the measurement of each parameter is more accurate and stable.
The specific method for adjusting the refrigerant charge of the fresh air conditioning unit in the air supply mode, the refrigeration mode and the heating mode is further explained by combining the related drawings as follows:
referring to fig. 7, when the temperature difference between the inside and the outside is small, the heat recovery efficiency of the heat recovery system has little influence on the total heat exchange amount, and the amount of the refrigerant does not need to be adjusted; when the indoor and outdoor temperature difference is large, the influence of the heat recovery efficiency on the total heat exchange amount is large, the purpose of optimizing the heat exchange amount of the heat recovery system is realized by adjusting the refrigerant amount, whether the heat recovery efficiency value of the heat recovery system is larger than or equal to the numerical value X is judged by detecting, whether the heat exchange amount reaches the standard is judged, if the heat recovery efficiency value does not reach the standard, the refrigerant amount is judged to be more or less through the refrigerant pressure of the position of the heat pipe exchanger, and therefore the action of increasing the refrigerant or reducing the refrigerant is executed.
The specific description is as follows:
1. the unit operates for 10min in an air supply mode to ensure that all detection parameters of the system are stable (indoor and outdoor temperatures);
2. at the moment, the indoor and outdoor temperature values of the 10 th min are recorded;
3.1, when the difference value between the outdoor temperature T outer ring and the indoor temperature T inner ring is less than or equal to a numerical value Y, namely | T outer ring-T inner ring | is less than or equal to Y, the indoor and outdoor temperature difference is small at the moment, the heat recovery system basically has no heat exchange amount, the refrigerant charging amount is judged to be not required to be changed, the operation state of the unit parts is not required to be changed, the indoor and outdoor temperature numerical values are detected again after the unit parts operate for 60min, and whether the refrigerant charging amount is proper or not is judged again;
3.2, when the difference value between the outdoor temperature T outer ring and the indoor temperature T inner ring is greater than the value Y, namely | T outer ring-T inner ring | is greater than Y, entering the next logic judgment;
3.2.1, when the absolute value of the difference value between the outdoor temperature T outer ring and the air supply temperature T air supply divided by the difference value between the outdoor temperature T outer ring and the indoor temperature T inner ring is more than or equal to the sensible heat exchange efficiency X of the heat pipe heat exchanger, namely | (T outer ring-T air supply)/(T outer ring-T inner ring) | is more than or equal to X, indicating that the heat exchange efficiency meets the requirement at the moment, the refrigerant filling amount of the heat recovery system is proper, the filling amount does not need to be adjusted and changed, the indoor and outdoor temperature value is detected again after the heat recovery system runs for 60min, and whether the refrigerant filling amount is proper or not is judged again;
3.2.2, when the absolute value of the difference value between the outdoor temperature Touter ring and the air supply temperature Tair supply divided by the difference value between the outdoor temperature Touter ring and the indoor temperature Tinner ring is less than the sensible heat exchange efficiency X of the heat pipe exchanger, namely | (Touter ring-Tair supply)/(Touter ring-Tinner ring) | < X, the heat exchange efficiency is lower at the moment, the requirement is not met, the refrigerant charge of the heat recovery system needs to be adjusted, and the next logic judgment is carried out;
3.2.2.1, when the pressure P of the first heat pipe exchanger is smaller than the P standard, the refrigerant filling amount in the heat recovery system is insufficient under the indoor and outdoor temperature difference, the refrigerant needs to be added, the pressure of the first heat pipe exchanger is increased by delta P1, the indoor and outdoor temperature values are detected again after the operation is carried out for 60min, and whether the refrigerant filling amount is proper or not is judged again;
3.2.2.2, when the pressure P of the first heat pipe exchanger is larger than or equal to the P standard, the refrigerant filling amount in the heat recovery system is more, the refrigerant needs to be reduced, the pressure of the first heat pipe exchanger is reduced by delta P1, the indoor and outdoor temperature values are detected again after the operation is carried out for 60min, and whether the refrigerant filling amount is proper or not is judged again.
Referring to fig. 8, the optimum refrigerant charge for the same refrigeration system varies from outdoor ambient temperature to outdoor ambient temperature. This patent is through fixed compressor frequency and throttling arrangement aperture, verifies and compares whether the running current value of unit this moment, air supply temperature value satisfy the standard value requirement, synthesizes through combining unit current value and air supply temperature and judges refrigerating system's refrigerant charge volume is many or few to carry out the action that increases the refrigerant or reduces the refrigerant.
The specific description is as follows:
1. firstly, starting a machine to operate and detect parameters (indoor and outdoor temperatures) in a first power-on operation refrigeration mode of the machine set;
2. the unit enters a refrigerant charging amount accounting operation mode of a refrigerating system, and performs refrigerating operation according to the detected outdoor temperature and the fixed compressor operation frequency E and the fixed opening E of the throttling device;
3. after the operation is carried out for 5min, recording the current in value of the unit, the air supply temperature T of the 7 unit and the refrigerant pressure P of the first heat exchanger 19;
3.1, when the current in of the unit is greater than the i standard 1 of the numerical value, the current indicates that the unit operates at the frequency and the opening degree at the moment, the energy efficiency is not high, the refrigerant filling amount in the refrigeration system is large, the refrigerant needs to be reduced, the pressure of the first heat exchanger 19 is reduced by delta P2, after the refrigerant is reduced, the unit continues to operate for 5min in a mode of fixing the frequency of the compressor and opening degree of the throttling device, the current value of the unit is detected again, whether the refrigerant filling amount is proper or not is judged again until the current in of the unit is less than or equal to the i standard 1 of the numerical value;
3.2, when the current in of the unit is less than or equal to the value i standard 1, entering the next logic judgment;
3.2.1, when the air supply temperature T of the 7 unit is higher than the numerical value T standard 1, indicating that the refrigerating system has less refrigerant, the current of the unit is lower, the air supply temperature is higher, the refrigerant needs to be added, increasing the pressure of the first heat exchanger 19 by delta P2, after the refrigerant is added, continuously operating for 5min in a mode of fixing the frequency of the compressor and opening of the throttling device, detecting the current value of the unit again, and judging whether the refrigerant charging amount is proper or not again;
3.2.2, when the air supply temperature T of the 7 units is less than or equal to the numerical value T standard 1, the refrigerant charge in the refrigerating system is proper at the moment, the refrigerant dose is judged not to be adjusted, the system charge accounting operation mode with fixed compressor frequency and throttle device opening degree is exited, the normal refrigerating mode is switched to operate, and after the normal refrigerating mode operates for 6 hours, the system charge accounting operation mode is reentered, and whether the refrigerant charge of the refrigerating system needs to be adjusted is judged.
Referring to fig. 9, the optimum refrigerant charge for the same heating system varies from outdoor ambient temperature to outdoor ambient temperature. This patent is through fixed compressor frequency and throttling arrangement aperture, verifies whether the running current value of contrast unit this moment, air supply temperature value satisfy the standard value requirement, synthesizes through combination unit current value and air supply temperature and judges that the refrigerant of heating system fills the volume and is more or less to carry out the action that increases the refrigerant or reduces the refrigerant.
The specific description is as follows:
1. firstly, starting a machine set to operate and detect parameters (indoor and outdoor temperatures) in a first power-on operation heating mode;
2. the unit enters a refrigerant charging amount accounting operation mode of a heating system, and performs heating operation according to the detected outdoor temperature and a fixed compressor operation frequency E and a fixed opening E of a throttling device;
3. after the operation is carried out for 5min, recording the current in value of the unit, the air supply temperature T of the 7 unit and the refrigerant pressure P of the first heat exchanger 19;
3.1, when the current in of the unit is greater than the i standard 2, the current indicates that the unit operates at the frequency and the opening degree at the moment, the energy efficiency is not high, the refrigerant filling amount in a heating system is large, the refrigerant needs to be reduced, the pressure of the first heat exchanger 19 is reduced by delta P2, after the refrigerant is reduced, the unit continues to operate for 5min in a mode of fixing the frequency of the compressor and opening degree of the throttling device, the current value of the unit is detected again, and whether the refrigerant filling amount is proper or not is judged again until the current in of the unit is less than or equal to the i standard 2;
3.2, when the current in of the unit is less than or equal to the value i standard 2, entering the next logic judgment;
3.2.1, when the air supply temperature T of the 7 unit is less than the numerical value T standard 2, indicating that the refrigerating fluid of the heating system is less, the current of the unit is lower, the air supply temperature is lower, the refrigerating fluid needs to be added, increasing the pressure of the first heat exchanger 19 by delta P2, after the refrigerating fluid is added, continuously operating for 5min in a mode of fixing the frequency of the compressor and opening of the throttling device, detecting the current value of the unit again, and judging whether the refrigerant charging amount is proper or not again;
3.2.2, when the air supply temperature T of the 7 units is greater than or equal to the numerical value T standard 2, the refrigerant charge in the heating system is proper at the moment, the refrigerant quantity is judged not to be adjusted, the system charge accounting operation mode with fixed compressor frequency and throttle device opening degree is exited, the normal heating mode is switched to operate, and after the normal heating mode operates for 6 hours, the system charge accounting operation mode is re-entered, and whether the refrigerant charge of the heating system needs to be adjusted is judged.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (15)

1. A fresh air conditioning unit is characterized by comprising an air conditioning system and a heat recovery system, wherein the air conditioning system comprises a first heat exchanger (19) and a second heat exchanger (9), a second port of the first heat exchanger (19) is in controllable communication with a first port of the second heat exchanger (9) through a throttling device (20), the heat recovery system comprises a first heat pipe heat exchanger (1) and a second heat pipe heat exchanger (5), the second port of the first heat pipe heat exchanger (1), the second port of the first heat exchanger (19) and the first port of the second heat pipe heat exchanger (5) are in switchable communication through a second three-way valve (22) flow path, the first heat pipe heat exchanger (1) and the first heat exchanger (19) are sequentially arranged in an indoor exhaust air duct along the flow direction of exhaust air, the second heat pipe heat exchanger (9) and the second heat pipe heat exchanger (5) are sequentially arranged in a fresh air duct along the flow direction of fresh air, the first port of the first heat pipe exchanger (1), the first port of the first heat exchanger (19) and the second port of the second heat pipe exchanger (5) are in flow path switchable communication through a first three-way valve (23), the first port of the first heat exchanger (19) can be in flow path switchable communication with one of an air inlet or an air outlet of a compressor (15), and the second port of the second heat pipe exchanger (5), the second port of the second heat exchanger (9), the other of the air inlet or the air outlet of the compressor (15) is in flow path switchable communication through a third three-way valve (10) so as to achieve transfer adjustment of the refrigerant charge amount between the air conditioning system and the heat recovery system.
2. The fresh air conditioning unit as recited in claim 1, wherein the fresh air supply duct has a fresh air inlet (14), and a fresh air filter (13) is disposed in the fresh air inlet (14); and/or the indoor exhaust air duct is provided with a return air inlet (3), and a return air filter (2) is arranged in the return air inlet (3).
3. The fresh air conditioning unit as recited in claim 1 further comprising a four-way valve (17), wherein an exhaust port of the compressor (15) is in communication with a first port of the four-way valve (17), a first port of the first heat exchanger (19) is in communication with a second port of the four-way valve (17), an intake port of the compressor (15) is in communication with a third port of the four-way valve (17), and a second port of the second heat exchanger (9) is in controllable communication with a fourth port of the four-way valve (17) through the third three-way valve (10).
4. A control method for a fresh air conditioning unit, for controlling the fresh air conditioning unit according to claim 3, comprising the steps of:
acquiring an operation mode of a fresh air conditioning unit;
acquiring a judgment parameter corresponding to the operation mode according to the acquired operation mode;
and controlling and switching flow paths of a throttling device (20), a first three-way valve (23), a second three-way valve (22), a third three-way valve (10) and a four-way valve (17) in the fresh air conditioning unit according to the size relation between the judgment parameters and the corresponding preset values so as to realize the transfer adjustment of the refrigerant charge amount between the air conditioning system and the heat recovery system.
5. The control method according to claim 4, wherein when the operation mode is an air supply mode, acquiring the judgment parameter corresponding to the operation mode according to the acquired operation mode comprises acquiring an air supply temperature Tsupply, a return air temperature Tinner ring and a fresh air inlet temperature Touter ring;
when | T outer ring-T inner ring | is greater than the value Y and | T outer ring-T blast | T outer ring-T inner ring | is less than the value X,
acquiring the refrigerant pressure P1 in the first heat pipe heat exchanger (1);
when the P1 is less than the P standard, controlling and switching flow paths of a throttling device (20), a first three-way valve (23), a second three-way valve (22), a third three-way valve (10) and a four-way valve (17) in the fresh air conditioning unit to increase the refrigerant charge amount in the heat recovery system so as to increase the refrigerant pressure in the first heat pipe heat exchanger (1); alternatively, the first and second electrodes may be,
when the P1 is larger than or equal to the P standard, the flow paths of the throttling device (20), the first three-way valve (23), the second three-way valve (22), the third three-way valve (10) and the four-way valve (17) in the fresh air conditioning unit are controlled and switched to reduce the refrigerant charge in the heat recovery system so as to reduce the refrigerant pressure in the first heat pipe heat exchanger (1).
6. The control method according to claim 5, wherein when P1 < P standard, controlling to switch the flow paths of the throttling device (20), the first three-way valve (23), the second three-way valve (22), the third three-way valve (10), and the four-way valve (17) in the fresh air conditioning unit to increase the refrigerant charge in the heat recovery system comprises:
controlling the first three-way valve (23) to communicate a first port of the first heat exchanger (19) with a first port of a first heat pipe heat exchanger (1), controlling the second three-way valve (22) to communicate a second port of the first heat pipe heat exchanger (1) with a first port of the second heat pipe heat exchanger (5), controlling the third three-way valve (10) to communicate a second port of the second heat exchanger (9) with a fourth port of the four-way valve (17), controlling the four-way valve (17) to enable exhaust gas of the compressor (15) to enter the first heat exchanger (19), and controlling the throttling device (20) to cut off; alternatively, the first and second electrodes may be,
when the P1 is larger than or equal to the P standard, the control switching of the flow paths of the throttling device (20), the first three-way valve (23), the second three-way valve (22), the third three-way valve (10) and the four-way valve (17) in the fresh air conditioning unit enables the refrigerant charge amount in the heat recovery system to be reduced comprises the following steps:
and controlling the first three-way valve (23) to communicate the second port of the second heat pipe heat exchanger (5) with the first port of the first heat pipe heat exchanger (1), controlling the second three-way valve (22) to communicate the second port of the first heat pipe heat exchanger (1) with the first port of the second heat pipe heat exchanger (5), controlling the third three-way valve (10) to communicate the second port of the second heat pipe heat exchanger (5) with the fourth port of the four-way valve (17), controlling the four-way valve (17) to enable the exhaust gas of the compressor (15) to enter the first heat exchanger (19), and controlling the throttling device (20) to cut off.
7. The control method of claim 5, wherein the supply air temperature Tsupply, the return air temperature Tinner loop and the fresh air inlet temperature Touter loop are obtained after the supply air mode is operated for the first preset time.
8. The control method according to claim 4, wherein when the operation mode is a cooling mode, acquiring the judgment parameter corresponding to the operation mode according to the acquired operation mode comprises acquiring an air supply temperature Tair supply and an operation current in of a compressor (15);
when in is larger than i standard 1, controlling and switching flow paths of a throttling device (20), a first three-way valve (23), a second three-way valve (22), a third three-way valve (10) and a four-way valve (17) in the fresh air conditioning unit to reduce the refrigerant filling amount in the air conditioning system so as to reduce the refrigerant pressure in the first heat exchanger (19); alternatively, the first and second electrodes may be,
when in is less than or equal to i standard 1 and T air supply is more than T standard 1, controlling and switching flow paths of a throttling device (20), a first three-way valve (23), a second three-way valve (22), a third three-way valve (10) and a four-way valve (17) in the fresh air conditioning unit to increase the refrigerant charge in the air conditioning system so as to increase the refrigerant pressure in the first heat exchanger (19).
9. The control method according to claim 4, wherein when the operation mode is a heating mode, acquiring the judgment parameter corresponding to the operation mode according to the acquired operation mode comprises acquiring an air supply temperature Tair and an operation current in of a compressor (15);
when in is larger than i standard 2, controlling and switching flow paths of a throttling device (20), a first three-way valve (23), a second three-way valve (22), a third three-way valve (10) and a four-way valve (17) in the fresh air conditioning unit to reduce the refrigerant filling amount in the air conditioning system so as to reduce the refrigerant pressure in the first heat exchanger (19); alternatively, the first and second electrodes may be,
when in is less than or equal to i standard 2 and T air supply is less than T standard 2, the flow paths of a throttling device (20), a first three-way valve (23), a second three-way valve (22), a third three-way valve (10) and a four-way valve (17) in the fresh air conditioning unit are controlled and switched to increase the refrigerant charging amount in the air conditioning system so as to increase the refrigerant pressure in the first heat exchanger (19).
10. The control method according to claim 8 or 9, characterized in that when the operation mode is a cooling mode or a heating mode, the operation of the compressor (15) in the air conditioning system is controlled to be performed at a preset frequency D and a preset opening E of the throttling device (20) for a second preset time, and then the supply air temperature Tsupply and the operation current in of the compressor (15) are obtained.
11. A method for controlling a fresh air handling unit according to claim 3, comprising the steps of:
acquiring an operation mode of a fresh air conditioning unit;
and controlling and switching the flow paths of a throttling device (20), a first three-way valve (23), a second three-way valve (22), a third three-way valve (10) and a four-way valve (17) in the fresh air conditioning unit and the start and stop of a compressor (15) according to the acquired operation mode.
12. The control method according to claim 11,
and when the operation mode is an air supply mode, controlling the compressor (15) to stop operating or keep in a stop state, controlling the first three-way valve (23) to enable the first port of the first heat pipe heat exchanger (1) to be communicated with the second port of the second heat pipe heat exchanger (5), controlling the second three-way valve (22) to enable the second port of the first heat pipe heat exchanger (1) to be communicated with the first port of the second heat pipe heat exchanger (5), and controlling the third three-way valve (10) to enable the second port of the second heat exchanger (9) to be communicated with an air exhaust port or an air suction port of the compressor (15).
13. The control method according to claim 12,
when the operation mode is a comfortable refrigeration mode, on the basis of the air supply mode, the compressor (15) is further controlled to start operation, the four-way valve (17) is controlled to enable an air suction port of the compressor (15) to be communicated with a second port of the second heat exchanger (9), an air exhaust port of the compressor (15) to be communicated with a first port of the first heat exchanger (19), and the throttling device (20) is controlled to be in a circulation state.
14. The control method according to claim 11,
when the operation mode is a common refrigeration mode, controlling the compressor (15) to start or keep operating, controlling the first three-way valve (23) to enable the first port of the first heat exchanger (19) to be communicated with the first port of the first heat pipe heat exchanger (1), controlling the second three-way valve (22) to enable the second port of the first heat pipe heat exchanger (1) to be communicated with the second port of the first heat exchanger (19), controlling the third three-way valve (10) to enable the second port of the second heat exchanger (9) to be communicated with the suction port of the compressor (15), controlling the four-way valve (17) to enable the exhaust port of the compressor (15) to be communicated with the first port of the first heat exchanger (19), and controlling the throttling device (20) to be in a circulation state.
15. The control method according to claim 11,
when the operation mode is a heating mode, controlling the compressor (15) to start or keep operating, controlling the first three-way valve (23) to enable the first port of the first heat exchanger (19) to be communicated with the first port of the first heat pipe heat exchanger (1), controlling the second three-way valve (22) to enable the second port of the first heat pipe heat exchanger (1) to be communicated with the second port of the first heat exchanger (19), controlling the third three-way valve (10) to enable the second port of the second heat exchanger (9) to be communicated with the exhaust port of the compressor (15), controlling the four-way valve (17) to enable the air suction port of the compressor (15) to be communicated with the first port of the first heat exchanger (19), and controlling the throttling device (20) to be in a circulation state.
CN202111566140.1A 2021-12-20 2021-12-20 Fresh air conditioning unit and control method thereof Active CN114234280B (en)

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CN106546028A (en) * 2016-09-29 2017-03-29 同济大学 A kind of frost-free type cold-producing medium Two-way Cycle fresh air handining unit
CN111336710A (en) * 2020-02-26 2020-06-26 西安交通大学 CO (carbon monoxide)2Refrigerant charge control system and method for optimal cycle performance
CN113137672A (en) * 2021-04-13 2021-07-20 青岛海尔空调电子有限公司 Air conditioning system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002181348A (en) * 2000-12-12 2002-06-26 Kimura Kohki Co Ltd Heat pump air conditioner
CN1534255A (en) * 2003-03-27 2004-10-06 徐宝安 New type multifunctional virtuous circle air conditioner
CN101097080A (en) * 2006-06-29 2008-01-02 陈国宝 Suspended combination type non outdoor aerials energy conservation environmental protection air conditioner
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