CN106705298B - Multi-connected fresh air conditioning unit with exhaust heat pump heat recovery function and heat exchange method - Google Patents
Multi-connected fresh air conditioning unit with exhaust heat pump heat recovery function and heat exchange method Download PDFInfo
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- CN106705298B CN106705298B CN201611208668.0A CN201611208668A CN106705298B CN 106705298 B CN106705298 B CN 106705298B CN 201611208668 A CN201611208668 A CN 201611208668A CN 106705298 B CN106705298 B CN 106705298B
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/54—Heating and cooling, simultaneously or alternatively
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention discloses a multi-connected fresh air conditioning unit with an exhaust heat pump for heat recovery; the technical problem to be solved is as follows: the traditional condensation air exhaust fresh air conditioning unit mentioned in the background art has defects. The technical scheme adopted is as follows: a multi-connected fresh air conditioning unit with an exhaust heat pump for heat recovery comprises an outdoor unit and at least two indoor air conditioning units connected in parallel, wherein the indoor air conditioning units are connected with the outdoor unit. The invention also provides a heat exchange method. The advantages are that: the multi-connected fresh air conditioning unit improves the energy efficiency and the operation stability of the refrigerating working condition unit by adding the outdoor heat exchanger, and improves the flexibility of the unit by connecting a plurality of indoor air conditioning units in parallel.
Description
Technical Field
The invention relates to a fresh air conditioning unit, in particular to a multi-connected fresh air conditioning unit with an exhaust heat pump for heat recovery and a heat exchange method.
Background
Along with the problem of air pollution becoming more and more serious and the living standard of people being improved continuously, fresh air conditioning units are also more and more emphasized. The fresh air conditioning unit introduces outdoor fresh air, carries out temperature and humidity treatment on the fresh air and then sends the fresh air into a room, so that the indoor air quality is improved, and the requirements of people on comfort and health are met. Although the fresh air system is very important for improving the air quality, the energy consumption generated by the heat and humidity treatment is very high.
In order to reduce the energy consumption of the unit, the exhaust heat recovery fresh air conditioning unit based on the refrigerant heat pump circulation is produced at the same time, and the air conditioning unit is also called as a condensation exhaust fresh air conditioning unit in the market. Air inlet and exhaust of the condensation exhaust fresh air conditioning unit are performed synchronously, and heat energy recovery is performed on the exhaust air, so that the energy efficiency and reliability of the system are improved.
However, the traditional condensation exhaust fresh air conditioning unit has two technical bottlenecks: 1. because the condensation air volume (exhaust air volume) can not be higher than the air supply volume, the high pressure of the system under the refrigeration working condition is higher, and the normal work of the compressor is not facilitated. 2. The traditional condensation air exhaust fresh air removal unit is designed to supply air and exhaust air in the same box body, centralized control is adopted, when any area in a building has a ventilation requirement, the unit is started integrally, and the unit cannot be shut down independently for the area without the ventilation requirement, so that the energy waste phenomenon exists.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the air-conditioning unit aims at the defects of the traditional condensation exhaust fresh air-conditioning unit in the background art.
The design idea of the invention is to improve the traditional condensation exhaust dehumidification fresh air handling unit, and the main measures comprise: 1. an outdoor heat exchanger is added to reduce the high pressure of the system under the refrigeration working condition and improve the refrigeration capacity of the system; 2. the invention adopts a mode of connecting a plurality of indoor air conditioning units in parallel, can meet the requirements of air exchange and independent temperature and humidity control of each air conditioning space, and improves the flexibility of the system.
The invention aims to provide a technical scheme of a fresh air conditioning unit, which improves the energy efficiency and the operation stability of the unit under the refrigeration working condition by adding an outdoor heat exchanger and improves the flexibility of the unit by connecting a plurality of indoor air conditioning units in parallel.
In order to solve the technical problems, the invention adopts the technical scheme that:
a multi-connected fresh air conditioning unit with an exhaust heat pump for heat recovery comprises an outdoor unit and at least two indoor air conditioning units connected in parallel, wherein the indoor air conditioning units are connected with the outdoor unit;
the outdoor unit comprises a compressor, an outdoor fan and an outdoor heat exchangerA four-way reversing valve, a first electromagnetic valve and a first throttling device, wherein the exhaust port of the compressor passes through a refrigerant connecting pipe LaA first connecting port connected with the four-way reversing valve, an air suction port of the compressor passes through a refrigerant connecting pipe LbA second connecting port connected with the four-way reversing valve;
the outdoor heat exchanger is provided with a refrigerant channel and an air channel, and the inlet of the refrigerant channel of the outdoor heat exchanger passes through a refrigerant connecting pipe LeConnected with the first electromagnetic valve, the outlet of the refrigerant channel of the outdoor heat exchanger passes through a refrigerant connecting pipe LfConnecting a first throttling device; the first throttling means is connected to the refrigerant connection pipe L through a refrigerantgCommunicating the indoor air conditioning unit; an air channel of the outdoor heat exchanger is communicated with an outdoor fan;
the third connecting port of the four-way reversing valve passes through a refrigerant connecting pipe LcAnd a refrigerant connection pipe LdA first electromagnetic valve is connected to the refrigerant connecting pipe LcAnd a refrigerant connection pipe LdIs connected with a refrigerant connecting pipe LmCommunicating the indoor air conditioning unit; the fourth connecting port of the four-way reversing valve passes through a refrigerant connecting pipe LnCommunicating the indoor air conditioning unit;
the indoor air conditioning unit comprises an exhaust heat exchanger, an exhaust fan, an air supply heat exchanger, an air supply fan, a second electromagnetic valve, a second throttling device, a third electromagnetic valve and a third throttling device,
the air supply heat exchanger is provided with a refrigerant channel and an air channel, and the inlet of the refrigerant channel of the air supply heat exchanger is connected with the refrigerant connecting pipe L through a refrigerantoOne end of the second throttling device is connected, and the other end of the second throttling device is connected with a refrigerant connecting pipe LpRefrigerant connecting pipe LpThrough refrigerant connecting pipe LhConnecting refrigerant connecting pipe Lg(ii) a The outlet of the refrigerant channel of the air supply heat exchanger passes through a refrigerant connecting pipe LqOne end of a second electromagnetic valve is connected, and the other end of the second electromagnetic valve passes through a refrigerant connecting pipe LrConnecting refrigerant connecting pipe Ln(ii) a The air supply channel of the air supply heat exchanger is communicated with an air supply fan;
the air exhaust heat exchanger is provided with a refrigerant channel and an air channel, and the air exhaust heat exchangerThe inlet of the refrigerant channel of the heater is connected with the refrigerant connecting pipe LsOne end of a third electromagnetic valve is connected, and the other end of the third electromagnetic valve passes through a refrigerant connecting pipe LtConnecting refrigerant connecting pipe Lm(ii) a The outlet of the refrigerant channel of the exhaust heat exchanger passes through a refrigerant connecting pipe LuOne end of a third throttling device is connected, and the other end of the third throttling device passes through a refrigerant connecting pipe LvConnecting pipe L for communicating refrigerantp(ii) a The air exhaust channel of the air exhaust heat exchanger is communicated with an air exhaust fan.
The first throttling device, the second throttling device and the third throttling device can be capillary tubes, short tubes, thermal expansion valves or electronic expansion valves and are communicated with the air supply heat exchanger, the air exhaust heat exchanger and the outdoor heat exchanger through refrigerant connecting tubes.
The invention also provides a heat exchange method, which adopts the multi-connected fresh air conditioning unit with the exhaust heat pump heat recovery function as claimed in claims 1-3, and comprises the following steps:
(1) and refrigerating the equipment: under the refrigeration working condition, the air supply heat exchanger is used as an evaporator, the air exhaust heat exchanger is used as a condenser, and the outdoor heat exchanger is used as an auxiliary condenser;
starting an outdoor fan in an outdoor unit, and simultaneously starting an air supply fan and an air exhaust fan in an indoor air conditioning unit;
the four-way reversing valve is connected to make the refrigerant connecting pipe LbAnd a refrigerant connection pipe LnCommunication, refrigerant connecting pipe LaAnd a refrigerant connection pipe LcCommunicating;
the first solenoid valve, the second solenoid valve and the third solenoid valve are opened;
starting the compressor;
refrigerant circulation: refrigerant enters the four-way reversing valve from the compressor and then is divided, and part of refrigerant passes through the refrigerant connecting pipe LmRefrigerant connection pipe LtA third electromagnetic valve and a refrigerant connecting pipe LsFirstly sent into the exhaust heat exchanger, and then passes through the refrigerant connecting pipe L from the outlet of the exhaust heat exchangeruA second electromagnetic valve, a refrigerant connecting pipe LpA second throttling device and a refrigerant connecting pipe LoFinally, the gas enters a distribution heat exchanger; another part of the refrigerant passes through the first solenoid valve and the refrigerant connection pipe LeEnters the outdoor heat exchanger and passes through the refrigerant connecting pipe L from the outlet of the outdoor heat exchangerfThrough the first throttling device and the refrigerant connecting pipe LgRefrigerant connection pipe LhRefrigerant connection pipe LpA second throttling device and a refrigerant connecting pipe LoFinally, the gas enters a distribution heat exchanger; the refrigerant after heat exchange of the distribution heat exchanger has an outlet of the distribution heat exchanger and passes through a refrigerant connecting pipe LqA second electromagnetic valve, a refrigerant connecting pipe LrAnd a refrigerant connection pipe LnReturning to the compressor;
air flow: an indoor air conditioning unit: outdoor fresh air enters the room through the air supply heat exchanger under the work of the air supply fan; returning air indoors, and exhausting the air indoors through the air exhaust heat exchanger under the work of the air exhaust fan; a compressor: outdoor fresh air is discharged to the outside through an outdoor heat exchanger under the work of an outdoor fan;
(2) and equipment heating: under the heating condition, the air supply heat exchanger is used as a condenser, the air exhaust heat exchanger is used as an evaporator, and the outdoor heat exchanger is used as an auxiliary evaporator;
starting an outdoor fan in an outdoor unit, and simultaneously starting an air supply fan and an air exhaust fan in an indoor air conditioning unit;
the four-way reversing valve is switched on in a reversing way, so that the refrigerant connecting pipe L is connectedbAnd a refrigerant connection pipe LcCommunication, refrigerant connecting pipe LaAnd a refrigerant connection pipe LnCommunicating;
the first solenoid valve, the second solenoid valve and the third solenoid valve are opened;
starting a compressor;
refrigerant circulation: refrigerant enters the four-way reversing valve from the compressor and passes through a refrigerant connecting pipe LnRefrigerant connection pipe LrA second solenoid valve and a refrigerant connection pipe LqThe refrigerant which enters the air supply heat exchanger and exchanges heat with the air supply heat exchanger flows out through a refrigerant connecting pipe LoThe second sectionFlow device and refrigerant connection pipe LpThe flow is divided, and a part of the refrigerant passes through the refrigerant connecting pipe LhRefrigerant connection pipe LgFirst throttling device and refrigerant connecting pipe LfThe refrigerant which enters the outdoor heat exchanger and flows out after heat exchange through the outdoor heat exchanger passes through a refrigerant connecting pipe LeA first electromagnetic valve, a refrigerant connecting pipe LcAnd a refrigerant connection pipe LbReturning to the compressor; the other part of the refrigerators is connected with the pipe L through the refrigerantvThird throttle valve and refrigerant connection pipe LuThe refrigerant which enters the air exhaust heat exchanger and exchanges heat through the air exhaust heat exchanger flows out through a refrigerant connecting pipe LsA third electromagnetic valve, a refrigerant connecting pipe LtRefrigerant connection pipe LmRefrigerant connection pipe LcAnd a refrigerant connection pipe LbReturning to the compressor;
air flow: an indoor air conditioning unit: outdoor fresh air enters the room through the air supply heat exchanger under the work of the air supply fan; returning air indoors, and exhausting the air indoors through the air exhaust heat exchanger under the work of the air exhaust fan; a compressor: outdoor fresh air is discharged to the outside through the outdoor heat exchanger under the work of the outdoor fan.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention solves the technical problems that the traditional condensation exhaust fan set controlled in a centralized way only can operate in a system centralized way, can not meet the individual requirements of air exchange and temperature and humidity control of each air conditioning space at the same time, has the technical bottleneck of energy waste, improves the flexibility of the system and reduces the operation energy consumption of the whole machine.
2. The device of the invention is not easy to have high-pressure alarm problem under the refrigeration working condition in summer, is beneficial to the normal operation of the compressor and improves the service life of the unit.
Drawings
Fig. 1 is a flow chart of the operation of the multi-connected fresh air conditioning unit with the heat recovery of the exhaust heat pump in the embodiment.
In the figure: 1. indoor air conditioning unit No. one, 15, second electromagnetic valve, 16, second throttling device, 17, third throttling device, 18, third electromagnetic valve, 2, indoor air conditioning unit No. twoAir conditioning unit, 21, refrigerant connection pipe L o22 refrigerant connection pipe LqRefrigerant connection pipe L, 23r24 refrigerant connection pipe LpRefrigerant connecting pipe L, 25hRefrigerant connection pipe L, 26v27 refrigerant connection pipe L u28 refrigerant connection pipe L s29 refrigerant connection pipe L t3, outdoor unit, 35, fourth electromagnetic valve, 36, fourth throttle device, 37, fifth throttle device, 38, fifth electromagnetic valve, 4, 6, blowing passage, 41, refrigerant connection pipe LORefrigerant connection pipe L, 42QRefrigerant connection pipe L R44 refrigerant connection pipe L P45 refrigerant connection pipe L H46 refrigerant connection pipe L V47 refrigerant connection pipe LURefrigerant connecting pipe L, 48S49 refrigerant connecting pipe LTRefrigerant connection pipe L61g62 refrigerant connection pipe L f63, refrigerant connection pipe LeRefrigerant connection pipe L, 64d65 refrigerant connecting pipe LcRefrigerant connection pipe L, 66a67 refrigerant connection pipe LbRefrigerant connection pipe L, 68n69 refrigerant connection pipe L m5, 7 exhaust channels, 51, an outdoor heat exchanger, 52, an outdoor fan, 53, a compressor, 54, a four-way reversing valve, 55, a first electromagnetic valve, 56, a first throttling device, 11, 31 air supply heat exchangers, 12, 32 exhaust heat exchangers, 13, 33 air supply fans and 14, 34 exhaust fans.
Detailed Description
The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.
In order to make the disclosure of the present invention more comprehensible, the following description is given in conjunction with fig. 1 and the detailed description.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b):
as shown in fig. 1, a flow chart of a multi-connected fresh air handling unit with a heat recovery function of an exhaust heat pump in this embodiment is shown, and the multi-connected condensing, exhaust and dehumidifying fresh air handling unit with an outdoor heat exchanger is designed in this embodiment, and the fresh air handling unit is composed of a first indoor air conditioning unit 1, a second indoor air conditioning unit 2 and an outdoor unit 3.
The outdoor unit 3 mainly includes a compressor 53, a four-way selector valve 54, an outdoor heat exchanger 51, an outdoor fan 52, a first throttle device 56, a first solenoid valve 55, and a refrigerant connection pipe L g61. Refrigerant connecting pipe L f62. Refrigerant connecting pipe L e63. Refrigerant connecting pipe L d64. Refrigerant connecting pipe L c65. Refrigerant connecting pipe L a66. Refrigerant connecting pipe L b67. Refrigerant connecting pipe L n68 and refrigerant connection pipe L m69。
The first indoor air conditioning unit 1 includes an air supply heat exchanger 11, an air supply fan 13, an exhaust air heat exchanger 12, an exhaust air fan 14, a second throttling device 16, a third throttling device 17, a second electromagnetic valve 15, a third electromagnetic valve 18, a refrigerant connecting pipe L o21. Refrigerant connecting pipe L q22. Refrigerant connecting pipe L r23. Refrigerant connecting pipe L p24. Refrigerant connecting pipe L h25. Refrigerant connecting pipe L v26. Refrigerant connecting pipe L u27. Refrigerant connecting pipe L s28 and refrigerant connection pipe L t29。
The second indoor air conditioning unit 2 includes a supply air heat exchanger 31, a supply air blower 33, an exhaust air heat exchanger 32, an exhaust air blower 34, a fourth throttle device 36, a fifth throttle device 37, a fourth electromagnetic valve 35, a fifth electromagnetic valve 38, a refrigerant connecting pipe L O41. Refrigerant connecting pipe L Q42. Refrigerant connecting pipe L R43. Refrigerant connecting pipe L P44. Refrigerant connecting pipe L H45. Refrigerant connecting pipe L V46. Refrigerant connecting pipe L U47. Refrigerant connecting pipe L S48 and refrigerant connection pipe L T49。
The first indoor air-conditioning unit 1 and the second indoor air-conditioning unit 2 are provided with air supply channels 4 and 6 and air exhaust channels 5 and 7, and the air supply channels 4 and 6 are not communicated with the air exhaust channels 5 and 7 through air pipes.
Since the internal structures of the air conditioning units of the first indoor air conditioning unit 1 and the second indoor air conditioning unit 2 are the same, the internal connection of the first indoor air conditioning unit 1 will be described as an example. A refrigerant channel and an air channel are arranged on an air supply heat exchanger 11 in a first indoor air-conditioning unit 1, and the inlet of the refrigerant channel of the air supply heat exchanger is connected with a refrigerant connecting pipe L o21 is connected to one end of the second throttle device 16, and the other end of the second throttle device 16 is connected to the refrigerant connection pipe LpRefrigerant connection pipe L24 p24 through refrigerant connecting pipe L h25 connecting refrigerant connecting pipe L g61; the outlet of the refrigerant passage of the blast heat exchanger 11 passes through a refrigerant connection pipe L q22 is connected with one end of a second electromagnetic valve 15, and the other end of the second electromagnetic valve 15 passes through a refrigerant connecting pipe L r23 connecting refrigerant connecting pipe L n68; the air supply channel 4 of the air supply heat exchanger is communicated with an air supply fan 13.
The exhaust heat exchanger 12 is provided with a refrigerant channel and an air channel, and the inlet of the refrigerant channel of the exhaust heat exchanger 12 passes through a refrigerant connecting pipe L s28 is connected to one end of the third solenoid valve 18, and the other end of the third solenoid valve 18 passes through a refrigerant connection pipe L t29 connecting refrigerant connecting pipe L m69; the outlet of the refrigerant channel of the exhaust heat exchanger 12 passes through a refrigerant connecting pipe L u27 is connected to one end of the third throttling means 17, and the other end of the third throttling means 17 passes through the refrigerant connection pipe L v26 connected refrigerant connecting pipe L p24; the air exhaust channel 5 of the air exhaust heat exchanger is communicated with an air exhaust fan.
The discharge port of the compressor 53 in the outdoor unit 3 is connected to the refrigerant connection pipe L a66 is connected to the first connection port of the four-way selector valve 54, and the suction port of the compressor 53 is connected via a refrigerant connection pipe L b67 is connected to the second connection port of the four-way selector valve 54.
The outdoor heat exchanger 51 is provided with a refrigerant passage and an air passage, and an inlet of the refrigerant passage of the outdoor heat exchanger is connected to the refrigerant connection pipe L e63 is connected to the first solenoid valve 55, and the outlet of the refrigerant passage of the outdoor heat exchanger passes through the refrigerant connection pipe L f62 is connected to the first restriction 56; the first throttling device 56 passes through the refrigerant connection pipe L g61 communicating with the indoor air conditioning unit; the air passage of the outdoor heat exchanger 51 communicates with an outdoor fan 52.
The third connection port of the four-way reversing valve 54 passes through the refrigerant connection pipe L c65 and refrigerant connection pipe L d64 is connected to the first solenoid valve 55 and the refrigerant connection pipe L c65 and refrigerant connection pipe L d64 through refrigerant connecting pipe L m69 communicating with the indoor air conditioning unit; the fourth connection port of the four-way reversing valve 54 passes through the refrigerant connection pipe L n68 communicate with the indoor air conditioning unit.
In the heat exchange method provided in this embodiment, the multi-connected fresh air conditioning unit with the exhaust heat pump for heat recovery specifically includes the following steps:
(1) and refrigerating the equipment: under the refrigeration working condition, the air supply heat exchanger is used as an evaporator, the air exhaust heat exchanger is used as a condenser, and the outdoor heat exchanger is used as an auxiliary condenser;
starting an outdoor fan in an outdoor unit, and simultaneously starting an air supply fan and an air exhaust fan in an indoor air conditioning unit;
the four-way reversing valve is connected to make the refrigerant connecting pipe LbAnd a refrigerant connection pipe LnCommunication, refrigerant connecting pipe LaAnd a refrigerant connection pipe LcCommunicating;
the first solenoid valve, the second solenoid valve and the third solenoid valve are opened;
starting the compressor;
refrigerant circulation: refrigerant enters the four-way reversing valve from the compressor and then is divided, and part of refrigerant passes through the refrigerant connecting pipe LmRefrigerant connection pipe LtA third electromagnetic valve and a refrigerant connecting pipe LsFirstly sent into the exhaust heat exchanger, and then passes through a refrigerant connecting pipe L from the outlet of the exhaust heat exchangeruA second electromagnetic valve, a refrigerant connecting pipe LpA second throttling device and a refrigerant connecting pipe LoFinally, the gas enters a distribution heat exchanger; another part of the refrigerant passes through the first solenoid valve and the refrigerant connection pipe LeEnters the outdoor heat exchanger and passes through the refrigerant connecting pipe L from the outlet of the outdoor heat exchangerfThrough the first throttling device and the refrigerant connecting pipe LgRefrigerant connection pipe LhRefrigerant connection pipe LpA second throttling device and a refrigerant connecting pipe LoFinally, the gas enters a distribution heat exchanger; the refrigerant after heat exchange of the distribution heat exchanger has an outlet of the distribution heat exchanger and passes through a refrigerant connecting pipe LqA second electromagnetic valve, a refrigerant connecting pipe LrAnd a refrigerant connection pipe LnReturning to the compressor;
air flow: an indoor air conditioning unit: outdoor fresh air enters the room through the air supply heat exchanger under the work of the air supply fan; returning air indoors, and exhausting the air indoors through the air exhaust heat exchanger under the work of the air exhaust fan; a compressor: outdoor fresh air is discharged to the outside through an outdoor heat exchanger under the work of an outdoor fan;
(2) and equipment heating: under the heating working condition, the air supply heat exchanger is used as a condenser, the air exhaust heat exchanger is used as an evaporator, and the outdoor heat exchanger is used as an auxiliary evaporator;
starting an outdoor fan in an outdoor unit, and simultaneously starting an air supply fan and an air exhaust fan in an indoor air conditioning unit;
the four-way reversing valve is switched on in a reversing way, so that the refrigerant connecting pipe L is connectedbAnd a refrigerant connection pipe LcCommunication, refrigerant connecting pipe LaAnd a refrigerant connection pipe LnCommunicating;
the first solenoid valve, the second solenoid valve and the third solenoid valve are opened;
starting the compressor;
refrigerant circulation: refrigerant enters the four-way reversing valve from the compressor and passes through a refrigerant connecting pipe LnRefrigerant connection pipe LrA second solenoid valve and a refrigerant connection pipe LqEnters the air supply heat exchanger, and the refrigerant after heat exchange of the air supply heat exchanger flows out through the refrigerant connecting pipe LoA second throttling device and a refrigerant connecting pipe LpTo split the flow, onePart of the refrigerant passes through the refrigerant connection pipe LhRefrigerant connection pipe LgFirst throttling device and refrigerant connecting pipe LfThe refrigerant which enters the outdoor heat exchanger and flows out after heat exchange through the outdoor heat exchanger passes through a refrigerant connecting pipe LeA first electromagnetic valve, a refrigerant connecting pipe LcAnd a refrigerant connection pipe LbReturning to the compressor; another part of the refrigerators is connected with the pipe L through the refrigerantvThird throttle valve and refrigerant connection pipe LuThe refrigerant which enters the air exhaust heat exchanger and exchanges heat through the air exhaust heat exchanger flows out through a refrigerant connecting pipe LsA third electromagnetic valve, a refrigerant connecting pipe LtRefrigerant connection pipe LmRefrigerant connection pipe LcAnd a refrigerant connection pipe LbReturning to the compressor;
air flow: an indoor air conditioning unit: outdoor fresh air enters the room through the air supply heat exchanger under the work of the air supply fan; returning air indoors, and exhausting the air indoors through the air exhaust heat exchanger under the work of the air exhaust fan; a compressor: outdoor fresh air is discharged to the outside through the outdoor heat exchanger under the work of the outdoor fan.
The specific embodiment mode of this embodiment:
the multi-connected condensing air-exhaust dehumidifying fresh air handling unit with the outdoor heat exchanger has the working conditions of refrigeration and heating, and can simultaneously operate all air conditioning units and only operate part of the air conditioning units. The specific working flow is as follows.
All air conditioning units are operated simultaneously:
under the refrigeration working condition, the air supply heat exchangers 11 and 31 are used as evaporators, the exhaust heat exchangers 12 and 32 are used as condensers, the outdoor heat exchanger 51 is used as an auxiliary condenser, and the four-way reversing valve 54 enables the refrigerant connecting pipe L b67. Refrigerant connecting pipe L n68 communication, refrigerant connecting pipe L c65. Refrigerant connecting pipe L a66 are communicated, and all the electromagnetic valves are fully opened.
Refrigerant circulation: refrigerant is introduced into the four-way reversing valve 54 from the compressor 53, and then branched, and a part of the refrigerant passes through the refrigerant connection pipe L m69. Refrigerant connecting pipe L t29 and refrigerant connection pipe L S48 are respectively sent into the first indoor air-conditioning unit 1 and the second indoor air-conditioning unit 2; the other portion of the refrigerant → the solenoid valve 55 → the outdoor heat exchanger 51 → the first expansion device 56, and then passes through the refrigerant connection pipe L g61. Refrigerant connecting pipe L h25 and refrigerant connection pipe L P44 into the first and second indoor air conditioning units 1 and 2. The refrigerant is connected with the pipe L m69. Refrigerant connecting pipe L t29 and refrigerant connection pipe LSThe refrigerant 48 introduced into the first and second indoor air-conditioning units 1 and 2 flows through the third and fifth solenoid valves 18 and 38 → the heat exchangers 12 and 32 → the third and fifth throttling devices 17 and 37, respectively, and then is connected to the refrigerant connection pipe L g61. Refrigerant connecting pipe L h25 and refrigerant connection pipe L P44 into the first and second indoor air-conditioning units 1 and 2, the refrigerant joins the second and fourth throttle devices 16 and 36 → the blower heat exchangers 11 and 31 → the second and fourth electromagnetic valves 15 and 35, respectively, and then passes through the refrigerant connection pipe L r23. Refrigerant connecting pipe L T49 and refrigerant connection pipe L n68 into the four-way reversing valve 54 and finally through the refrigerant connecting pipe L b67 are sent back to the compressor 53. Air side flow: outdoor fresh air → air supply heat exchangers 11, 31 → air supply fans 13, 33 → indoors; indoor return air → exhaust heat exchangers 12, 32 → exhaust fans 14, 34 → outdoors; outdoor fresh air → outdoor heat exchanger 51 → outdoor fan 52 → outdoors. The air volume of the outdoor fan is larger than that of the air volume of the exhaust side in the air conditioning unit, so that heat dissipation can be better performed, the high pressure of the system is reduced, and the energy efficiency of the unit is improved.
Under heating conditions, the air supply heat exchangers 11 and 31 serve as condensers, the exhaust heat exchangers 12 and 32 serve as evaporators, the outdoor heat exchanger 51 serves as an auxiliary evaporator, and the refrigerant connecting pipe L is connected by the four-way reversing valve 54b67. Refrigerant connecting pipe L c65 communication, refrigerant connecting pipe L a66. Refrigerant connecting pipe L n68 are communicated, and all the electromagnetic valves are fully opened. Refrigerant circulation: refrigerant enters the four-way reversing valve 54 from the compressor 53 and passes through the refrigerant connecting pipe L n68. Refrigerant connecting pipe L r23 and refrigerant connection pipe L T49 into the first and second indoor air conditioning units 1 and 2, and flows through the second and fourth solenoid valves 15 and 35 → the blower heat exchangers 11 and 31 → the second and fourth throttle devices 16 and 36 in the air conditioning units, and then is branched, and a part of the refrigerant passes through the refrigerant connection pipe L p24 → refrigerant connection pipe L h25 → refrigerant connection pipe L g61 refrigerant connection pipe L R43 → refrigerant connection pipe L P44 → refrigerant connection pipe L g61 toward the first throttling device 56 in the outdoor unit 3 → the outdoor heat exchanger 51 → the electromagnetic valve 55; the other part is connected with the refrigerant connecting pipe L p24 → refrigerant connection pipe L v26; refrigerant connecting pipe L R43 → refrigerant connection pipe L H45 enter the third throttling device 17, the fifth throttling device 37 → the exhaust fan 12, 32 → the third electromagnetic valve 18, the fifth electromagnetic valve 38, and then pass through the refrigerant connecting pipe L t29. Refrigerant connecting pipe L S48. Refrigerant connecting pipe L m69 back to the outdoor unit 3 and then flows through the refrigerant connection pipe LdThe refrigerant of 64 flows into the four-way reversing valve 54 after being merged, and finally flows into the refrigerant connecting pipe L b67 back to the compressor 53.
Part of the air conditioning units operate independently:
under the refrigeration condition that the air conditioning unit operates independently, if the user who installs the air conditioning unit 1 has a use demand and the user who installs the air conditioning unit 2 has no use demand, at this time, the air supply heat exchanger 11 is used as an evaporator, the air exhaust heat exchanger 12 is used as a condenser, the outdoor heat exchanger 51 is used as an auxiliary condenser, and the four-way reversing valve 54 enables the refrigerant connecting pipe L to be connected with the refrigerant connecting pipe L b67. Refrigerant connecting pipe L n68 communication, refrigerant connecting pipe L a66. Refrigerant connecting pipe L c65, the second electromagnetic valve 15, the third electromagnetic valve 18 and the first electromagnetic valve 55 are kept normally open, and the fifth electromagnetic valve 38 and the fourth electromagnetic valve 35 are kept closed. Refrigerant circulation: refrigerant is introduced into the four-way reversing valve 54 from the compressor 53, and then branched, and a part of the refrigerant passes through the refrigerant connection pipe L m69. Refrigerant connecting pipe L t29 into the indoor air conditioning unit;the other part of the refrigerant → the first solenoid valve 55 → the outdoor heat exchanger 51 → the first throttle device 56, and passes through the refrigerant connection pipe L g61. Refrigerant connecting pipe L h25 into the indoor air conditioning unit. The refrigerant is connected with the pipe L m69. Refrigerant connecting pipe L t29 the refrigerant introduced into the air conditioning unit 1 flows through the third solenoid valve 18 → the discharge air heat exchanger 12 → the third throttling means 17, and then is connected to the refrigerant connection pipe L g61. Refrigerant connecting pipe L h25 into the air conditioning unit, the refrigerant merges into the second throttling device 16 → the blast heat exchanger 11 → the second electromagnetic valve 15, respectively, and then passes through the refrigerant connection pipe L r23. Refrigerant connecting pipe L n68 into the four-way reversing valve 54 and finally through the refrigerant connecting pipe L b67 are sent back to the compressor 53. Air side flow: outdoor fresh air → air supply heat exchanger 11 → air supply fan 13 → indoor; indoor return air → exhaust heat exchanger 12 → exhaust fan 14 → outdoor; outdoor fresh air → outdoor heat exchanger 51 → outdoor fan 52 → outdoors.
Under the heating condition that the air conditioning unit operates independently, the air supply heat exchanger 11 serves as a condenser, the air exhaust heat exchanger 12 serves as an evaporator, the outdoor heat exchanger 51 serves as an auxiliary evaporator, and the four-way reversing valve 54 enables the refrigerant connecting pipe L to be connected with the refrigerant connecting pipe L b67. Refrigerant connecting pipe L c65 communication, refrigerant connecting pipe L a66. Refrigerant connecting pipe L n68, the second electromagnetic valve 15, the third electromagnetic valve 18 and the first electromagnetic valve 55 are kept normally open, and the fifth electromagnetic valve 38 and the fourth electromagnetic valve 35 are kept closed. Refrigerant circulation: refrigerant enters the four-way reversing valve 54 from the compressor 53, and passes through the refrigerant connecting pipe L n68. Refrigerant connecting pipe L r23 into the indoor air conditioning unit, flows through the second solenoid valve 15 → the blast heat exchanger 11 → the second throttling device 16 in the indoor air conditioning unit, and then is branched, and a part of the refrigerant passes through the refrigerant connection pipe Lp24-refrigerant connection Lh25-refrigerant connection pipe L g61 toward the first throttling device 56 in the outdoor unit 3 → the outdoor heat exchanger 51 → the first electromagnetic valve 55; the other part is connected with the refrigerant connecting pipe Lp24-refrigerant connection L v26 into the third throttling means 17 →The exhaust heat exchanger 12 → the third electromagnetic valve 18, and then the refrigerant connection pipe L t29. Refrigerant connecting pipe L m69 back to the outdoor unit 3 and then flows through the refrigerant connection pipe LdThe refrigerant of 64 flows into the four-way reversing valve 54 after being merged, and finally flows into the refrigerant connecting pipe L b67 back to the compressor 53.
If the user installing the air conditioning unit 2 has a use demand and the user installing the air conditioning unit 1 has no use demand, the second electromagnetic valve 15 and the third electromagnetic valve 18 are closed, and the fourth electromagnetic valve 35 and the fifth electromagnetic valve 38 are kept to be normally opened. The operation switching among the units is realized through the control, so that the flexibility of the unit is enhanced, and unnecessary energy loss is reduced.
The above embodiments are only described by taking one outdoor unit and two indoor air conditioning units as examples, but the number of parallel outdoor units and the number of parallel indoor air conditioning units of the multi-connected fresh air conditioning unit with exhaust heat pump heat recovery are not limited, and it is within the protection scope of this patent to increase or decrease the number of parallel outdoor units and the number of parallel indoor air conditioning units.
In the above embodiments, all components of the refrigerant cycle and the air duct are not completely shown, in the implementation process, different refrigerants are selected, a four-way reversing valve, a high-pressure liquid storage device, a gas-liquid separator, an oil separator, a filter, a dryer and other common refrigeration accessories are arranged in the refrigerant circuit, a filter, a silencer, an auxiliary humidifier, an auxiliary heater, a sterilizing device and other air treatment accessories are arranged in the air duct, different air supply nozzles and air return grids are selected, the position of the fan is changed, or a heat exchanger, a fan, an air valve and the like are added without departing from the spirit of the technical scheme of the present invention, which cannot be regarded as substantial improvements made on the present invention, and the present invention shall fall into the protection scope of the present invention.
The terms "first," "second," and the like are used herein to define components, as one skilled in the art would know: the use of the words "first", "second", etc. are used merely to distinguish one element from another in order to facilitate description. Unless otherwise stated, the above words have no special meaning.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A multi-connected fresh air conditioning unit with an exhaust heat pump for heat recovery is characterized by comprising an outdoor unit and at least two indoor air conditioning units connected in parallel, wherein the indoor air conditioning units are connected with the outdoor unit; the outdoor unit comprises a compressor, an outdoor fan, an outdoor heat exchanger, a four-way reversing valve, a first electromagnetic valve and a first throttling device, wherein an exhaust port of the compressor is connected with a first connecting port of the four-way reversing valve through a refrigerant connecting pipe La, and an air suction port of the compressor is connected with a second connecting port of the four-way reversing valve through a refrigerant connecting pipe Lb; the outdoor heat exchanger is provided with a refrigerant channel and an air channel, the inlet of the refrigerant channel of the outdoor heat exchanger is connected with the first electromagnetic valve through a refrigerant connecting pipe Le, and the outlet of the refrigerant channel of the outdoor heat exchanger is connected with the first throttling device through a refrigerant connecting pipe Lf; the first throttling device is communicated with the indoor air conditioning unit through a refrigerant connecting pipe Lg; an air channel of the outdoor heat exchanger is communicated with an outdoor fan; the third connecting port of the four-way reversing valve is connected with the first electromagnetic valve through a refrigerant connecting pipe Lc and a refrigerant connecting pipe Ld, and the connecting position of the refrigerant connecting pipe Lc and the refrigerant connecting pipe Ld is communicated with the indoor air conditioning unit through a refrigerant connecting pipe Lm; a fourth connecting port of the four-way reversing valve is communicated with the indoor air conditioning unit through a refrigerant connecting pipe Ln; the indoor air conditioning unit comprises an exhaust air heat exchanger, an exhaust air fan, an air supply heat exchanger, an air supply fan, a second electromagnetic valve, a second throttling device, a third electromagnetic valve and a third throttling device, wherein a refrigerant channel and an air channel are arranged on the air supply heat exchanger, the inlet of the refrigerant channel of the air supply heat exchanger is connected with one end of the second throttling device through a refrigerant connecting pipe Lo, the other end of the second throttling device is connected with a refrigerant connecting pipe Lp, and the refrigerant connecting pipe Lp is connected with a refrigerant connecting pipe Lg through a refrigerant connecting pipe Lh; an outlet of a refrigerant channel of the air supply heat exchanger is connected with one end of a second electromagnetic valve through a refrigerant connecting pipe Lq, and the other end of the second electromagnetic valve is connected with a refrigerant connecting pipe Ln through a refrigerant connecting pipe Lr; an air supply channel of the air supply heat exchanger is communicated with an air supply fan; a refrigerant channel and an air channel are arranged on the exhaust heat exchanger, the inlet of the refrigerant channel of the exhaust heat exchanger is connected with one end of a third electromagnetic valve through a refrigerant connecting pipe Ls, and the other end of the third electromagnetic valve is connected with a refrigerant connecting pipe Lm through a refrigerant connecting pipe Lt; the outlet of the refrigerant channel of the exhaust heat exchanger is connected with one end of a third throttling device through a refrigerant connecting pipe Lu, and the other end of the third throttling device is communicated with a refrigerant connecting pipe Lp through a refrigerant connecting pipe Lv; an air exhaust channel of the air exhaust heat exchanger is communicated with an air exhaust fan, under the refrigerating working condition, the air supply heat exchanger serves as an evaporator, the air exhaust heat exchanger serves as a condenser, the outdoor heat exchanger serves as an auxiliary condenser, the outdoor fan in the outdoor unit is started, the air supply fan and the air exhaust fan in the indoor air conditioning unit are started at the same time, the four-way reversing valve is communicated, the refrigerant connecting pipe Lb is communicated with the refrigerant connecting pipe Ln, the refrigerant connecting pipe La is communicated with the refrigerant connecting pipe Lc, and the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are opened; starting the compressor, enabling the refrigerant to enter the four-way reversing valve from the compressor, then shunting, firstly sending a part of the refrigerant into the exhaust heat exchanger through a refrigerant connecting pipe Lm, a refrigerant connecting pipe Lt, a third electromagnetic valve and a refrigerant connecting pipe Ls, and then finally entering the air supply heat exchanger through an outlet of the exhaust heat exchanger through a refrigerant connecting pipe Lu, a second electromagnetic valve, a refrigerant connecting pipe Lp, a second throttling device and a refrigerant connecting pipe Lo; the other part of the refrigerant firstly enters the outdoor heat exchanger through the first electromagnetic valve and the refrigerant connecting pipe Le, then passes through the first throttling device, the refrigerant connecting pipe Lg, the refrigerant connecting pipe Lh, the refrigerant connecting pipe Lp, the second throttling device and the refrigerant connecting pipe Lo from the outlet of the outdoor heat exchanger through the refrigerant connecting pipe Lf, and finally enters the air supply heat exchanger, the refrigerant after heat exchange of the air supply heat exchanger has the outlet of the air supply heat exchanger and is sent back to the compressor through the refrigerant connecting pipe Lq, the second electromagnetic valve, the refrigerant connecting pipe Lr and the refrigerant connecting pipe Ln, outdoor fresh air enters the room through the air supply heat exchanger under the work of the air supply fan, and indoor return air is exhausted to the outdoor through the air exhaust heat exchanger under the work of the air exhaust fan.
2. The multi-split fresh air conditioning unit with heat recovery of the exhaust heat pump according to claim 1, wherein the first throttling device, the second throttling device and the third throttling device can be capillary tubes, short tubes, thermal expansion valves or electronic expansion valves, and are communicated with the air supply heat exchanger, the exhaust heat exchanger and the outdoor heat exchanger through refrigerant connecting tubes.
3. A method of heat exchange, comprising: the heat exchange method adopts the multi-connected fresh air conditioning unit with the exhaust heat pump heat recovery function as claimed in any one of claims 1 to 2, and comprises the following steps:
(1) and refrigerating the equipment: under the refrigeration working condition, the air supply heat exchanger is used as an evaporator, the air exhaust heat exchanger is used as a condenser, and the outdoor heat exchanger is used as an auxiliary condenser;
starting an outdoor fan in an outdoor unit, and simultaneously starting an air supply fan and an air exhaust fan in an indoor air conditioning unit;
the four-way reversing valve is communicated, so that the refrigerant connecting pipe Lb is communicated with the refrigerant connecting pipe Ln, and the refrigerant connecting pipe La is communicated with the refrigerant connecting pipe Lc;
the first solenoid valve, the second solenoid valve and the third solenoid valve are opened;
starting the compressor;
refrigerant circulation: refrigerant enters a four-way reversing valve from a compressor and then is divided, a part of refrigerant is firstly sent into an exhaust heat exchanger through a refrigerant connecting pipe Lm, a refrigerant connecting pipe Lt, a third electromagnetic valve and a refrigerant connecting pipe Ls, and then finally enters an air supply heat exchanger through an outlet of the exhaust heat exchanger through a refrigerant connecting pipe Lu, a second electromagnetic valve, a refrigerant connecting pipe Lp, a second throttling device and a refrigerant connecting pipe Lo; the other part of the refrigerant firstly enters the outdoor heat exchanger through the first electromagnetic valve and the refrigerant connecting pipe Le, then passes through the first throttling device, the refrigerant connecting pipe Lg, the refrigerant connecting pipe Lh, the refrigerant connecting pipe Lp, the second throttling device and the refrigerant connecting pipe Lo from the outlet of the outdoor heat exchanger through the refrigerant connecting pipe Lf, and finally enters the air supply heat exchanger;
the refrigerant after heat exchange of the air supply heat exchanger is sent back to the compressor through a refrigerant connecting pipe Lq, a second electromagnetic valve, a refrigerant connecting pipe Lr and a refrigerant connecting pipe Ln from the outlet of the air supply heat exchanger;
air flow: outdoor fresh air enters the room through the air supply heat exchanger under the work of the air supply fan; indoor return air is exhausted to the outside through the exhaust heat exchanger under the work of the exhaust fan;
outdoor fresh air is discharged to the outside through an outdoor heat exchanger under the work of an outdoor fan;
(2) and equipment carries out heating: in the heating condition, the air supply heat exchanger is used as a condenser, the air exhaust heat exchanger is used as an evaporator,
the outdoor heat exchanger is used as an auxiliary evaporator;
starting an outdoor fan in an outdoor unit, and simultaneously starting an air supply fan and an air exhaust fan in an indoor air conditioning unit;
the four-way reversing valve is switched on in a reversing way, so that the refrigerant connecting pipe Lb is communicated with the refrigerant connecting pipe Lc, and the refrigerant connecting pipe La is communicated with the refrigerant connecting pipe Ln;
the first solenoid valve, the second solenoid valve and the third solenoid valve are opened;
starting the compressor;
refrigerant circulation: refrigerant enters a four-way reversing valve from a compressor, the refrigerant enters an air supply heat exchanger through a refrigerant connecting pipe Ln, a refrigerant connecting pipe Lr, a second electromagnetic valve and a refrigerant connecting pipe Lq, the refrigerant subjected to heat exchange of the air supply heat exchanger flows out and is shunted through a refrigerant connecting pipe Lo, a second throttling device and a refrigerant connecting pipe Lp, a part of the refrigerant enters an outdoor heat exchanger through a refrigerant connecting pipe Lh, a refrigerant connecting pipe Lg, a first throttling device and a refrigerant connecting pipe Lf, and finally the refrigerant flowing out after heat exchange of the outdoor heat exchanger returns to the compressor through a refrigerant connecting pipe Le, a first electromagnetic valve, a refrigerant connecting pipe Lc and a refrigerant connecting pipe Lb; the other part of the refrigerators enter the air exhaust heat exchanger through a refrigerant connecting pipe Lv, a third throttle valve and a refrigerant connecting pipe Lu, and the refrigerant subjected to heat exchange by the air exhaust heat exchanger flows out to return to the compressor through a refrigerant connecting pipe Ls, a third electromagnetic valve, a refrigerant connecting pipe Lt, a refrigerant connecting pipe Lm, a refrigerant connecting pipe Lc and a refrigerant connecting pipe Lb;
air flow: outdoor fresh air enters the room through the air supply heat exchanger under the work of the air supply fan; indoor return air is exhausted to the outside through the exhaust heat exchanger under the work of the exhaust fan;
outdoor fresh air is discharged to the outside through the outdoor heat exchanger under the work of the outdoor fan.
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| CN107560012B (en) * | 2017-08-18 | 2020-03-03 | 广东美的暖通设备有限公司 | Multi-connected fresh air fan system suitable for high-temperature climate and control method thereof |
| CN107726531B (en) * | 2017-11-14 | 2023-05-09 | 科林贝思（深圳）科技有限公司 | Heat pump fresh air system and control method thereof |
| CN109539406B (en) * | 2018-11-02 | 2024-06-04 | 广东申菱环境系统股份有限公司 | Three-section type multi-connected air conditioning unit |
| CN109405324B (en) * | 2018-11-06 | 2023-08-15 | 广东建设职业技术学院 | Double-evaporator air conditioning unit and control method thereof |
| CN112361801B (en) * | 2020-10-27 | 2022-06-03 | 张勇 | Control method of heat pump drying system |
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