CN116336586A - Four-pipe air-cooled heat pump unit and control method thereof - Google Patents
Four-pipe air-cooled heat pump unit and control method thereof Download PDFInfo
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- CN116336586A CN116336586A CN202310279049.4A CN202310279049A CN116336586A CN 116336586 A CN116336586 A CN 116336586A CN 202310279049 A CN202310279049 A CN 202310279049A CN 116336586 A CN116336586 A CN 116336586A
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The utility model relates to a heat pump air conditioning field, especially four-pipe air-cooled heat pump unit and control method thereof, four-pipe air-cooled heat pump unit includes compressor, cross valve, fin coil pipe, hot water side heat exchanger, cold water side heat exchanger, three-way valve, first electronic expansion valve, second electronic expansion valve, gas-liquid separation ware, the fin coil pipe includes the first heat exchange circuit of air inlet side and the second heat exchange circuit of air-out side, and the heat transfer area of second heat exchange circuit is greater than first heat exchange circuit. According to the four-pipe air-cooled heat pump unit, different fin coil heat exchange loops can be used according to the requirements of the environment and working conditions, when the environment temperature is lower than the air suction saturation temperature of the compressor, the refrigerant still cannot be accumulated in the fin coil, so that as much refrigerant as possible participates in the circulation of a refrigerating system, and the obvious reduction of the evaporation temperature of the unit caused by the reduction of the circulation quantity of the refrigerant participating in the work is prevented.
Description
Technical Field
The application relates to the field of heat pump air conditioners, in particular to a four-pipe air-cooled heat pump unit and a control method thereof.
Background
At present, four-pipe air-cooled heat pump units in the market are more and more, but when the operation of winter refrigeration and hot water modes is commonly existing, when the ambient temperature is lower than the air suction saturation temperature of a compressor, the refrigerant can migrate into the fin coil, so that the circulation quantity of the refrigerant participating in the operation is reduced, the evaporation temperature of the unit is obviously reduced, the operation efficiency of the unit is influenced, and the operation reliability of the unit is also influenced when serious.
Aiming at the problems, valves are adopted to control the migration of the refrigerant to the fin coil in the prior art, and the specific solution is as follows, and the solution is as follows: an electric ball valve is arranged on a connecting pipe of the four-way valve and the fin coil pipe, and the electric ball valve is closed in a refrigerating and hot water mode to prevent refrigerant from migrating into the fin coil pipe from the gas-liquid separator through the four-way valve. The solution method is as follows: the four-way valve and the gas-liquid separator connecting pipe are provided with one-way valves, and when the pressure in the gas-liquid separator is higher than the pressure in the fin coil pipe, the migration of the refrigerant is blocked, for example, the prior application publication number of the applicant: CN113446756a. However, the above solution only to a certain extent prevents the migration of the refrigerant towards the finned coils, and it does not allow the refrigerant already accumulated in the finned coils to be driven back into the refrigeration system to participate in the cycle. In addition, in the second solution, in the single hot water mode, the low pressure return air may cause pressure loss when passing through the check valve, thereby affecting the performance of the compressor.
Disclosure of Invention
Aiming at the technical problems in the prior art, the application provides a four-pipe air-cooled heat pump unit and a control method thereof, and the heat pump unit has high operation efficiency and good reliability.
On the one hand, the application provides a four-pipe air-cooled heat pump unit, which comprises a compressor 1, a four-way valve 2, a fin coil pipe 3, a hot water side heat exchanger 9, a cold water side heat exchanger 7, a three-way valve 12, a first electronic expansion valve 6, a second electronic expansion valve 13 and a gas-liquid separator 8, wherein the fin coil pipe 3 comprises a first heat exchange loop at an air inlet side and a second heat exchange loop at an air outlet side, and the heat exchange area of the second heat exchange loop is 1.5-5 times that of the first heat exchange loop; the outlet of the compressor 1 is connected with the interface D of the four-way valve 2, the interface C of the four-way valve 2 is connected with the hot water side heat exchanger 9, the interface E of the four-way valve 2 is connected with one end of the second heat exchange loop of the fin coil 3, the gas-liquid separator 8 is provided with two inlets and one outlet, one of the two inlets is connected with the interface S of the four-way valve 2, the other inlet is connected with the outlet of the cold water side heat exchanger 7, and the outlet of the gas-liquid separator 8 is connected with the inlet of the compressor 1; the hot water side heat exchanger 9 is connected with a three-way valve 12 interface A, a three-way valve 12 interface B is connected with one end of a first heat exchange loop of the fin coil 3, and the other end of the first heat exchange loop is connected with a three-way valve 12 interface C in parallel and then is respectively connected with a first electronic expansion valve 6 and a second electronic expansion valve 13; the first electronic expansion valve 6 is connected with the inlet of the cold water side heat exchanger 7, the second electronic expansion valve 13 is connected with the other end of the second heat exchange loop, and a bypass is arranged between the second electronic expansion valve 13 and the second heat exchange loop and is connected with the first electronic expansion valve 6; and in different operation modes, the first heat exchange loop and the second heat exchange loop are selected as the outdoor heat exchanger.
In particular, the outlet of the hot water side heat exchanger 9 is provided with a second one-way valve 10, the outlet of the second one-way valve 10 is connected with a liquid reservoir 11, and the liquid reservoir 11 is connected with a three-way valve 12 interface A.
In particular, the first heat exchange circuit is connected with the three-way valve 12 in parallel connection with the interface C and then is connected with the dry filter 5, and the outlet of the dry filter 5 is respectively connected with the first electronic expansion valve 6 and the second electronic expansion valve 13.
In particular, the bypass is provided with a one-way valve 4, and the outlet of the first heat exchange circuit is connected with the interface C of the three-way valve 12 and the outlet of the first one-way valve 4 in parallel and then connected to the inlet of the drier-filter 5.
In particular, the three-way valve 12 is an electric three-way valve.
On the other hand, the application provides a control method of a four-pipe air-cooled heat pump unit in a refrigerating and hot water mode, wherein when the heat pump unit is operated in the refrigerating and hot water mode, as described above, the four-way valve 2 is not powered on, the interface A of the three-way valve 12 is communicated with the interface B, the second electronic expansion valve 13 is closed, and the first electronic expansion valve 6 is communicated; the high-temperature high-pressure gas discharged by the compressor 1 enters the hot water side heat exchanger 9 through the interface D and the interface C of the four-way valve 2, heat generated in the condensation process is discharged to hot water to heat the hot water, the hot water is condensed into high-pressure liquid, the high-pressure liquid refrigerant flows through the first heat exchange loop of the fin coil 3 through the three-way valve 12, the high-pressure liquid refrigerant is throttled and depressurized to low-temperature low-pressure gas-liquid two-phase refrigerant by the first electronic expansion valve 6, the low-temperature low-pressure gas-liquid two-phase refrigerant enters the cold water side heat exchanger 7, the refrigerant absorbs heat from chilled water flowing through the cold water side heat exchanger 7 and cools the chilled water, and the refrigerant is evaporated and heat exchanged and returns to the air suction port of the compressor through the gas-liquid separator 8 to reciprocate.
Particularly, when the load demand on the cold water side is larger and the load demand on the hot water side is relatively smaller, the heat exchange fan of the fin coil 3 can be properly started, and the high-pressure liquid refrigerant flowing through the first heat exchange loop of the fin coil 3 close to the air outlet side exchanges heat to improve the supercooling degree, improve the refrigerating capacity of the unit, balance the cold and hot loads and reduce the frequent switching of modes of the unit.
In a third aspect, the present application proposes a control method for a hot water mode of a four-pipe air-cooled heat pump unit, where, as described above, when the unit is operated in a single hot water mode, the four-way valve 2 is not powered, the flow direction of the three-way valve 12 is a to C, the first electronic expansion valve 6 is closed, and the second electronic expansion valve 13 is turned on; the high-temperature high-pressure gas discharged by the compressor 1 enters a hot water side heat exchanger 9 through a four-way valve 2 to discharge heat to hot water for heating, the refrigerant is condensed into high-pressure liquid with a certain supercooling degree, then flows to a second electronic expansion valve 13 through a three-way valve 12 to be throttled into low-temperature low-pressure gas-liquid two-phase refrigerant, then flows into a second heat exchange loop of the fin coil pipe 3, evaporates and exchanges heat into low-pressure gas, and then flows through a gas-liquid separator 8 through the four-way valve 2 to return to a compressor air suction port, and thus the reciprocating cycle is performed.
In the fourth aspect, the application provides a control method of a refrigerating mode of a four-pipe air-cooled heat pump unit, wherein the four-pipe air-cooled heat pump unit is as described above, when the unit operates in a single refrigerating mode, the four-way valve 2 is powered on, the second electronic expansion valve 13 is closed, the first electronic expansion valve 6 works, and the flowing direction of the three-way valve 12 is not required; the compressor 1 discharges high-temperature high-pressure gas, the high-temperature high-pressure gas enters a second heat exchange loop of the fin coil 3 through the four-way valve 2, heat is discharged to the atmosphere, the refrigerant is condensed and exchanges heat to form high-pressure liquid, the high-pressure liquid flows through a bypass between the second electronic expansion valve 13 and the second heat exchange loop to the first electronic expansion valve 6, is throttled to form low-temperature low-pressure gas-liquid two-phase refrigerant, flows into the cold water side heat exchanger 7, absorbs heat from chilled water flowing through the cold water side heat exchanger 7, cools the chilled water, and then the refrigerant is evaporated and exchanges heat to form low-pressure superheated gas, and the low-pressure superheated gas returns to the air suction port of the compressor through the gas-liquid separator 8 to circulate in a reciprocating manner.
In particular, when the ambient temperature of the unit is lower than-10 ℃ and the set water temperature of the hot water side reaches or the hot water side has no hot water requirement, the hot water flow entering and exiting the hot water side heat exchanger 9 is closed, the four-way valve 2 loses electricity, namely the flow direction is from the D interface to the C interface, the flow direction of the three-way valve 12 is switched to the flow direction from the A interface to the B interface, the high-temperature high-pressure gaseous refrigerant discharged by the compressor 1 is only subjected to exothermic condensation in the first heat exchange loop with smaller heat exchange area of the fin coil pipe 3, the pressure in the condenser is improved, and the single refrigeration operation reliability of the unit at ultralow temperature is ensured.
On the basis of the common sense in the art, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the application.
The technical scheme has the following advantages or beneficial effects: according to the four-pipe air-cooled heat pump unit, different fin coil heat exchange loops can be used according to the requirements of the environment and working conditions, when the environment temperature is lower than the air suction saturation temperature of the compressor, the refrigerant still cannot be accumulated in the fin coil, so that as much refrigerant as possible participates in the circulation of a refrigerating system, and the obvious reduction of the evaporation temperature of the unit caused by the reduction of the circulation quantity of the refrigerant participating in the work is prevented.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be obvious to a person skilled in the art that other figures can be obtained from the figures provided without the inventive effort.
Fig. 1 is a schematic structural view of a four-pipe air-cooled heat pump unit according to the present application.
FIG. 2 is a schematic structural view of a finned coil according to the present application.
Wherein, 1-compressor; 2-four-way valve; 3-fin coil; 30-a first heat exchange tube; 31-aluminum foil; 32-end plates; 33-flute type liquid inlet pipe; 311-liquid inlet port; 34-flute type intermediate liquid pipe; 35-flute-type liquid outlet pipe; 312-a liquid outlet interface; 36-a dispenser assembly; 322-liquid-side interface; 313-Mao Xifen liquid tube; 37-elbow; 38-gas collecting tube; 39-a second heat exchange tube; 4-a first one-way valve; 5-drying the filter; 6-a first electronic expansion valve; 7-a cold water side heat exchanger; 8-a gas-liquid separator; 9-a hot water side heat exchanger; 10-a second one-way valve; 11-a reservoir; 12-a three-way valve; 13-a second electronic expansion valve.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings of the present application. It is apparent that the described embodiments are only some of the embodiments of the present application and are intended to be used to explain the inventive concept. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
The terms "first," "second," and the like, as used in the description, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The term "plurality" means two or more, unless specifically defined otherwise.
The terms "coupled," "connected," and the like as used in the description herein are to be construed broadly and may be, for example, fixedly coupled, detachably coupled, or integrally formed, unless otherwise specifically defined and limited; may be a mechanical connection, an electrical connection; can be directly connected and indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the terms in the embodiments can be understood by those of ordinary skill in the art according to the specific circumstances.
The terms "one particular embodiment" and "one particular embodiment" as used in this description mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Referring to fig. 1, a specific embodiment of the present application discloses a four-pipe air-cooled heat pump unit, the heat pump unit includes a compressor 1, a four-way valve 2, a fin coil 3, a hot water side heat exchanger 9, a cold water side heat exchanger 7, a three-way valve 12, a first electronic expansion valve 6, a second electronic expansion valve 13, and a gas-liquid separator 8, and the three-way valve 12 is preferably an electric three-way valve.
The outlet of the compressor 1 is connected with the interface D of the four-way valve 2, the interface C of the four-way valve 2 is connected with the hot water side heat exchanger 9, the interface E of the four-way valve 2 is connected with the fin coil pipe 3, the gas-liquid separator 8 is provided with two inlets and one outlet, one of the two inlets of the gas-liquid separator 8 is connected with the interface S of the four-way valve 2, the other inlet is connected with the outlet of the cold water side heat exchanger 7, and the outlet of the gas-liquid separator 8 is connected with the inlet of the compressor 1.
Referring to fig. 2, a specific embodiment of the present application discloses a fin coil pipe of a four-pipe air-cooled heat pump unit, the fin coil pipe 3 includes a shell body composed of an end plate 32 and an aluminum foil 31, a heat exchange fan is arranged on one side of the shell body, a first heat exchange pipe 30 is arranged on an air inlet side in the shell body, and a second heat exchange pipe 39 is arranged on an air outlet side in the shell body. The flute type liquid inlet pipe 33, the plurality of first heat exchange pipes 30, the flute type intermediate liquid pipe 34 and the flute type liquid outlet pipe 35 are sequentially connected in series to form a first heat exchange loop, wherein a liquid inlet interface 311 of the flute type liquid inlet pipe 33 is connected with an interface B of the three-way valve 12, and a liquid outlet interface 312 of the flute type liquid outlet pipe 35 is connected with an interface C of the three-way valve 12 and an outlet of the first one-way valve 4 in parallel and then connected to an inlet of the drying filter 5. The second heat exchange tubes 39 are connected with the elbow 37 in groups, the distributor assembly 36, the plurality of Mao Xifen liquid tubes 313, the groups of the second heat exchange tubes 39 and the gas collecting tube 38 are connected in series to form a second heat exchange loop, wherein the gas-side interface 321 of the gas collecting tube 38 is connected to the interface E of the four-way valve 2, and the liquid-containing side interface 322 of the distributor assembly 36 is respectively connected with the inlets of the second electronic expansion valve 13 and the first one-way valve 4. The first heat exchange loop is an auxiliary heat exchange area with smaller area, the second heat exchange loop is a main heat exchange area with larger area, and preferably, the heat exchange area of the main heat exchange area is 1.5-5 times that of the auxiliary heat exchange area, and most preferably, 2-3 times that of the auxiliary heat exchange area.
The outlet of the hot water side heat exchanger 9 is provided with a second one-way valve 10, the outlet of the second one-way valve 10 is connected with a liquid reservoir 11, the liquid reservoir 11 is connected with a three-way valve 12 interface A, a three-way valve 12 interface B is connected with one end of a first heat exchange loop of the fin coil pipe 3, and the other end of the first heat exchange loop is connected with a three-way valve 12 interface C and an outlet of the first one-way valve 4 in parallel and then connected to an inlet of the drying filter 5.
When the unit is operated in a refrigerating and hot water mode, the four-way valve 2 is not electrified, the interface A of the three-way valve 12 is communicated with the interface B, the second electronic expansion valve 13 is closed, and the first electronic expansion valve 6 is communicated.
When the unit is operated in a refrigeration and hot water mode, the flow of the refrigerant and the heat exchange condition are as follows: the high-temperature and high-pressure gas discharged by the compressor 1 enters the hot water side heat exchanger 9 through the interface D and the interface C of the four-way valve 2, and a large amount of heat generated in the condensation process is discharged to hot water to heat the hot water, and then the hot water is condensed into high-pressure liquid. The high-pressure liquid refrigerant flows into the liquid storage 11 through the second one-way valve 10, flows through the first heat exchange loop of the fin coil 3 and the dry filter 5 to the first electronic expansion valve 6 through the three-way valve 12, throttles and reduces pressure to be low-temperature low-pressure gas-liquid two-phase refrigerant, then enters the cold water side heat exchanger 7, absorbs heat from chilled water flowing through the cold water side heat exchanger 7 and reduces the temperature of the chilled water, the refrigerant is evaporated and heat-exchanged to be low-pressure superheated gas, and then returns to the air suction port of the compressor through the gas-liquid separator 8 to be reciprocally circulated.
When the ambient temperature is lower than the suction saturation temperature of the compressor, the high-pressure liquid refrigerant flows through the fin coil 3 and heats the fin coil 3, so that the refrigerant in the system can be prevented from migrating into the fin coil 3 through the gas-liquid separator 8, and the refrigerant stored in the second heat exchange tube of the fin coil 3 can be heated to migrate into the gas-liquid separator 8 with relatively low pressure, so that the refrigerant participates in the refrigeration cycle. Further, when the load demand on the cold water side is larger and the load demand on the hot water side is relatively smaller, the heat exchange fan of the fin coil 3 can be properly started, and the high-pressure liquid refrigerant flowing through the first heat exchange loop of the fin coil 3 exchanges heat to improve the supercooling degree, so that the refrigerating capacity of the unit is improved, the cold and hot loads are balanced, and the frequent switching of the modes of the unit is reduced.
When the unit is operated in a single hot water mode, the four-way valve 2 is not electrified, the flowing direction of the three-way valve 12 is A to C, the first electronic expansion valve 6 is closed, and the second electronic expansion valve 13 is conducted.
When the unit is operated in a single hot water mode, the refrigerant flow and the heat exchange condition are as follows: the high-temperature high-pressure gas discharged by the compressor 1 enters a hot water side heat exchanger 9 through a four-way valve 2 to discharge a large amount of heat to hot water for heating, the refrigerant is condensed into high-pressure liquid with a certain supercooling degree, then flows into a liquid storage 11 through a second one-way valve 10, flows through a drying filter 5 to a second electronic expansion valve 13 through a three-way valve 12, throttles into low-temperature low-pressure gas-liquid two-phase refrigerant, flows into a second heat exchange loop of the fin coil pipe 3 for evaporation heat exchange to form low-pressure gas, flows through a gas-liquid separator 8 through the four-way valve 2, and then returns to a compressor air suction port, and is circulated in a reciprocating manner.
When the temperature is lower in winter and the single hot water mode is switched to the refrigerating and hot water mode, if slight frosting residues exist on the fin coil, the high-pressure liquid refrigerant flowing through the first heat exchange loop of the fin coil 3 can heat the surface of the fin coil and melt a frost layer, so that the defrosting frequency in the single hot water mode is reduced, and the heating operation efficiency is improved.
When the unit is operated in a single refrigeration mode, the four-way valve 2 is powered on, the second electronic expansion valve 13 is closed, the first electronic expansion valve 6 works, and the flowing direction of the three-way valve 12 is not required.
When the unit operates in a single refrigeration mode, the refrigerant flow and heat exchange conditions are as follows: the high-temperature high-pressure gas discharged by the compressor 1 enters the fin coil 3 through the four-way valve 2, heat is discharged to the atmosphere, the refrigerant is condensed and exchanges heat to form high-pressure liquid, the high-pressure liquid flows through the first one-way valve 4 to the dry filter 5 and then to the first electronic expansion valve 6, the high-temperature high-pressure gas flows into the cold water side heat exchanger 7 after being throttled to form low-temperature low-pressure gas-liquid two-phase refrigerant, heat is absorbed from chilled water flowing through the cold water side heat exchanger 7, the chilled water is cooled, the refrigerant is evaporated and exchanges heat to form low-pressure superheated gas, and the low-pressure superheated gas returns to the air suction port of the compressor through the gas-liquid separator 8 and circulates in a reciprocating manner.
Furthermore, when the unit is cooled at the environment temperature lower than-10 ℃ in winter and even lower environment temperature is needed, and the set water temperature on the hot water side reaches or the hot water side has no hot water requirement, the unit can perform the following operation when the machine possibly has low-pressure alarm shutdown because the fin coil pipe is too good in heat exchange and cannot maintain enough condensing pressure in the single cooling mode: and the flow of hot water entering and exiting the hot water side heat exchanger 9 is closed, the four-way valve 2 is switched from the interface D to the interface E to the interface D to the interface C, and the flow of the three-way valve 12 is switched from the interface A to the interface B. At the moment, the high-temperature high-pressure gaseous refrigerant discharged by the compressor 1 only carries out exothermic condensation in the first heat exchange loop with smaller heat exchange area of the fin coil 3, the pressure in the condenser is improved, and the single refrigeration operation reliability of the unit at ultralow temperature is ensured.
While embodiments of the present application have been illustrated and described above, it will be appreciated that the above-described embodiments are exemplary and should not be construed as limiting the present application. Various changes and modifications may be made to the present application without departing from the spirit and scope of the application, and such changes and modifications fall within the scope of the application as hereinafter claimed.
Claims (10)
1. Four-pipe air-cooled heat pump unit, including compressor (1), cross valve (2), fin coil (3), hot water side heat exchanger (9), cold water side heat exchanger (7), three-way valve (12), first electronic expansion valve (6), second electronic expansion valve (13), gas-liquid separator (8), its characterized in that: the fin coil (3) comprises a first heat exchange loop at the air inlet side and a second heat exchange loop at the air outlet side, and the heat exchange area of the second heat exchange loop is 1.5-5 times that of the first heat exchange loop; the outlet of the compressor (1) is connected with the interface D of the four-way valve (2), the interface C of the four-way valve (2) is connected with the hot water side heat exchanger (9), the interface E of the four-way valve (2) is connected with one end of the second heat exchange loop of the fin coil pipe (3), the gas-liquid separator (8) is provided with two inlets and one outlet, one of the two inlets is connected with the interface S of the four-way valve (2), the other inlet is connected with the outlet of the cold water side heat exchanger (7), and the outlet of the gas-liquid separator (8) is connected with the inlet of the compressor (1); the hot water side heat exchanger (9) is connected with a port A of the three-way valve (12), a port B of the three-way valve (12) is connected with one end of a first heat exchange loop of the fin coil pipe (3), and the other end of the first heat exchange loop is connected with a port C of the three-way valve (12) in parallel and then is respectively connected with the first electronic expansion valve (6) and the second electronic expansion valve (13); the first electronic expansion valve (6) is connected with the inlet of the cold water side heat exchanger (7), the second electronic expansion valve (13) is connected with the other end of the second heat exchange loop, and a bypass is arranged between the second electronic expansion valve and is connected with the first electronic expansion valve (6); and in different operation modes, the first heat exchange loop and the second heat exchange loop are selected as the outdoor heat exchanger.
2. The four-pipe air-cooled heat pump unit according to claim 1, wherein: the outlet of the hot water side heat exchanger (9) is provided with a second one-way valve (10), the outlet of the second one-way valve (10) is connected with a liquid reservoir (11), and the liquid reservoir (11) is connected with a three-way valve (12) interface A.
3. The four-pipe air-cooled heat pump unit according to claim 1, wherein: the first heat exchange loop is connected with the interface C of the three-way valve (12) in parallel and then is connected with the dry filter (5), and the outlet of the dry filter (5) is respectively connected with the first electronic expansion valve (6) and the second electronic expansion valve (13).
4. A four-pipe air-cooled heat pump assembly according to claim 3, wherein: the bypass is internally provided with a first one-way valve (4), and an outlet of the first heat exchange loop is connected with an interface C of the three-way valve (12) and an outlet of the first one-way valve (4) in parallel and then is connected to an inlet of the dry filter (5).
5. A four-pipe air-cooled heat pump assembly according to claim 3, wherein: the three-way valve (12) is an electric three-way valve.
6. The control method of the four-pipe air-cooled heat pump unit in the cooling and hot water modes is characterized in that: when the heat pump unit operates in a refrigerating and hot water mode, the four-way valve (2) is not electrified, the interface A and the interface B of the three-way valve (12) are communicated, the second electronic expansion valve (13) is closed, and the first electronic expansion valve (6) is communicated; the high-temperature high-pressure gas discharged by the compressor (1) enters the hot water side heat exchanger (9) through the interface D and the interface C of the four-way valve (2), heat generated in the condensation process is discharged to hot water to heat the hot water, the hot water is condensed into high-pressure liquid, the high-pressure liquid refrigerant flows through a first heat exchange loop of the fin coil (3) through the three-way valve (12) after flowing through the fin coil, the high-pressure liquid refrigerant is throttled and depressurized into low-temperature low-pressure gas-liquid two-phase refrigerant by the first electronic expansion valve (6) and then enters the cold water side heat exchanger (7), the refrigerant absorbs heat from chilled water flowing through the cold water side heat exchanger (7) and cools the chilled water, and the refrigerant returns to the air inlet of the compressor through the gas-liquid separator (8) after evaporating and exchanging heat and circulates reciprocally.
7. The control method of the four-pipe air-cooled heat pump unit in the cooling and hot water mode as set forth in claim 6, wherein: when the load demand on the cold water side is larger and the load demand on the hot water side is relatively smaller, the heat exchange air quantity of the fin coil (3) is increased, and the high-pressure liquid refrigerant flowing through the first heat exchange loop on the air outlet side of the fin coil (3) exchanges heat so as to improve the supercooling degree of the high-pressure liquid refrigerant.
8. The control method of the hot water mode of the four-pipe air-cooled heat pump unit, wherein the four-pipe air-cooled heat pump unit is as set forth in claim 1, and is characterized in that: when the unit operates in a single hot water mode, the four-way valve (2) is not electrified, the flowing direction of the three-way valve (12) is A to C, the first electronic expansion valve (6) is closed, and the second electronic expansion valve (13) is conducted; the high-temperature high-pressure gas discharged by the compressor (1) enters the hot water side heat exchanger (9) through the four-way valve (2) to discharge heat to the hot water for heating, the refrigerant is condensed into high-pressure liquid with a certain supercooling degree, then flows to the second electronic expansion valve (13) through the three-way valve (12) to be throttled into low-temperature low-pressure gas-liquid two-phase refrigerant, then flows into the second heat exchange loop of the fin coil pipe (3), is evaporated and heat-exchanged into low-pressure gas, and then flows through the gas-liquid separator (8) through the four-way valve (2) to return to the air inlet of the compressor, and thus the reciprocating circulation is realized.
9. The control method of the refrigerating mode of the four-pipe air-cooled heat pump unit, wherein the four-pipe air-cooled heat pump unit is as set forth in claim 1, and is characterized in that: when the unit operates in a single refrigeration mode, the four-way valve (2) is powered on, the second electronic expansion valve (13) is closed, and the first electronic expansion valve (6) works; the high-temperature high-pressure gas discharged by the compressor (1) enters a second heat exchange loop of the fin coil (3) through the four-way valve (2), heat is discharged to the atmosphere, the refrigerant is condensed and exchanges heat to form high-pressure liquid, then the high-pressure liquid flows through a bypass between the second electronic expansion valve (13) and the second heat exchange loop to the first electronic expansion valve (6), is throttled to form low-temperature low-pressure gas-liquid two-phase refrigerant, then flows into the cold water side heat exchanger (7), absorbs heat from chilled water flowing through the cold water side heat exchanger (7), cools the chilled water, and then the refrigerant is evaporated and exchanges heat to form low-pressure superheated gas, and then returns to the air suction port of the compressor through the gas-liquid separator (8) to reciprocate.
10. The control method for the cooling mode of the four-pipe air-cooled heat pump unit according to claim 9, wherein: when the ambient temperature of the unit is lower than-10 ℃ and the set water temperature of the hot water side reaches or the hot water side has no hot water demand, the hot water flow entering and exiting the hot water side heat exchanger (9) is closed, the four-way valve (2) loses electricity, namely the flow direction is from the D interface to the C interface, the flow direction of the three-way valve (12) is switched to from the A interface to the B interface, and the high-temperature high-pressure gaseous refrigerant discharged by the compressor (1) is only subjected to heat release condensation in the first heat exchange loop with smaller heat exchange area of the fin coil (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310279049.4A CN116336586A (en) | 2023-03-21 | 2023-03-21 | Four-pipe air-cooled heat pump unit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310279049.4A CN116336586A (en) | 2023-03-21 | 2023-03-21 | Four-pipe air-cooled heat pump unit and control method thereof |
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| CN116336586A true CN116336586A (en) | 2023-06-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116878179A (en) * | 2023-09-01 | 2023-10-13 | 北京金盛通科技发展有限责任公司 | Efficient refrigeration method and system for air cooling unit |
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2023
- 2023-03-21 CN CN202310279049.4A patent/CN116336586A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116878179A (en) * | 2023-09-01 | 2023-10-13 | 北京金盛通科技发展有限责任公司 | Efficient refrigeration method and system for air cooling unit |
| CN116878179B (en) * | 2023-09-01 | 2023-12-05 | 北京金盛通科技发展有限责任公司 | Efficient refrigeration method and system for air cooling unit |
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