EP3945267A1 - Heat pump system and control method thereof - Google Patents
Heat pump system and control method thereof Download PDFInfo
- Publication number
- EP3945267A1 EP3945267A1 EP20215663.4A EP20215663A EP3945267A1 EP 3945267 A1 EP3945267 A1 EP 3945267A1 EP 20215663 A EP20215663 A EP 20215663A EP 3945267 A1 EP3945267 A1 EP 3945267A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow path
- pump system
- heat pump
- throttling device
- mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 238000011084 recovery Methods 0.000 claims abstract description 24
- 239000003507 refrigerant Substances 0.000 claims description 47
- 239000012530 fluid Substances 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000010257 thawing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
-
- 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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
-
- 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
-
- 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
- F25B2313/009—Compression machines, plants or systems with reversible cycle not otherwise provided for indoor unit in circulation with outdoor unit in first operation mode, indoor unit in circulation with an other heat exchanger in second operation mode or outdoor unit in circulation with an other heat exchanger in third operation mode
-
- 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
- F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
Definitions
- the present disclosure relates to the technical field of air conditioning and domestic hot water supply device. More specifically, the present disclosure relates to a heat pump system and a control method thereof.
- each flow path is equipped with a throttling device and a check valve connected in parallel with it, and each throttling device functions in a different mode.
- An object of at least the preferred embodiments of the present disclosure is to solve or at least alleviate the problems existing in the prior art.
- a heat pump system which includes:
- the second flow path may include a second check valve connected in parallel with the second throttling device, and the second check valve may only allow a fluid flowing in a direction toward the second end of the second flow path to pass through.
- the second flow path may include a solenoid valve connected in parallel with the second throttling device, and in the cooling mode, the heat pump system may open the solenoid valve and closes the second throttling device to bypass the second throttling device.
- the heat pump system may further include a receiver, and the receiver may include a single pipeline and may be connected to or near a position where the second end of the first flow path, the second end of the second flow path and the second end of the third flow path are connected.
- the heat pump system may further include a receiver which includes a first pipeline and a second pipeline, the second end of the first flow path and the second end of the second flow path may be connected to the first pipeline of the receiver, and the second end of the third flow path may be connected to the second pipeline of the receiver.
- the heat pump system may further include a solenoid valve, which is connected between the second pipeline of the receiver and a position between the second heat exchanger and the second throttling device on the second flow path.
- a solenoid valve which is connected between the second pipeline of the receiver and a position between the second heat exchanger and the second throttling device on the second flow path.
- the heat pump system may further include a second check valve, which is connected between the second pipeline of the receiver and a position between the second heat exchanger and the second throttling device on the second flow path, and which only allows a fluid flowing in a direction toward a second end of the second pipeline to pass through.
- a second check valve which is connected between the second pipeline of the receiver and a position between the second heat exchanger and the second throttling device on the second flow path, and which only allows a fluid flowing in a direction toward a second end of the second pipeline to pass through.
- the heat pump system may include a cooling working condition, and under the cooling working condition, the heat pump system may be switched among the cooling mode, the hot water preparing mode, and the cooling heat recovery mode.
- the heat pump system may include a heating working condition, and under the heating working condition, the heat pump system may be switched between the heating mode and the hot water preparing mode, wherein the heat pump system performs defrosting by being switched to the first connection mode and fully opening the first throttling device.
- the compressor may be an enhanced vapor injection compressor
- the heat pump system may further include an economizer
- the first flow path may include a branch point and passes through a first pipeline of the economizer, wherein in the heating mode and the hot water preparing mode, a refrigerant flowing from the second end of the first flow path toward the first end of the first flow path may pass through the first pipeline of the economizer before passing through the first throttling device, and may be divided at the branch point into a first part leading to the first throttling device and a second part leading to a branch; the second part of the refrigerant may pass through a branch throttling device on the branch and a second pipeline of the economizer to exchange heat with the refrigerant in the first pipeline of the economizer, and the refrigerant passing through the second pipeline of the economizer may be supplied to an enhanced vapor injection port of the compressor.
- the third flow path may not have a throttling device.
- the switching assembly may include two four-way valves.
- a control method of a heat pump system includes: operating the heat pump system in any two, three, or four of a cooling mode, a heating mode, a hot water preparing mode, and a cooling heat recovery mode; wherein:
- the method may include operating the heat pump system under a cooling working condition, wherein the heat pump system may be switched among the cooling mode, the hot water preparing mode, and the cooling heat recovery mode.
- the method may include operating the heat pump system under a heating working condition, wherein the heat pump system is switched between the heating mode and the hot water preparing mode; optionally, under the heating working condition, the first end of the first flow path may be connected to the outlet of the compressor, the first end of the second flow path may be connected to the inlet of the compressor, and the first throttling device may be fully opened to perform defrost.
- the heat pump system may include: a compressor 4, a switching assembly 90, a first flow path 100, a second flow path 200, a third flow path 300, and a control system (not shown).
- the compressor 4 may include an inlet 42 of the compressor and an outlet 41 of the compressor.
- a separator 6 may be provided upstream of the inlet 42 of the compressor to remove liquid in the return fluid.
- the first flow path 100 may include a first end 11 of the first flow path, a first heat exchanger 12, a first throttling device 13 and a second end 14 of the first flow path in sequence.
- the first heat exchanger 12 may be a coil heat exchanger and may be located outdoor.
- the second flow path 200 may include a first end 21 of the second flow path, a second heat exchanger 22, a second throttling device 23, and a second end 24 of the second flow path in sequence.
- the second heat exchanger 22 may be a brazed plate heat exchanger and may be located indoor.
- the third flow path 300 may include a first end 31 of the third flow path, a third heat exchanger 32, a first check valve 33 and a second end 34 of the third flow path.
- a direction from the first end to the second end of each flow path is defined as a first flow direction of each flow path
- a direction from the second end to the first end of each flow path is defined as a second flow direction of each flow path.
- the first check valve 33 on the third flow path only allows a fluid flowing in a direction toward the second end of the third flow path, that is, it only allows the fluid flowing in the first flow direction in the third flow path to pass through.
- the first flow path 100 may include a filter 15 between the first heat exchanger 12 and the first throttling device 13.
- the second flow path 200 may include a filter 25 between the second heat exchanger 22 and the second throttling device 23.
- the third flow path 300 may include a filter 35 between the third heat exchanger 32 and the first check valve 33. The second end 14 of the first flow path, the second end 24 of the second flow path and the second end 34 of the third flow path are connected.
- the second end 14 of the first flow path, the second end 24 of the second flow path and the second end 34 of the third flow path may be directly connected.
- the second end 14 of the first flow path is connected to a first pipeline 52 of an optional receiver 5
- the second end 24 of the second flow path and the second end 34 of the third flow path are connected to a second pipeline 53 of the receiver 5.
- the function of the receiver 5 is to store part of the refrigerant under a condition of excessive refrigerant, and to discharge the refrigerant when more refrigerant is needed.
- the heat pump system further includes a switching assembly 90, which may be switched between any two, three or four of the following connection modes: a first connection mode, in which the first end 11 of the first flow path is connected to the outlet 41 of the compressor, and the first end 21 of the second flow path is connected to the inlet 42 of the compressor; a second connection mode, in which the first end 21 of the second flow path is connected to the outlet 41 of the compressor, and the first end 11 of the first flow path is connected to the inlet 42 of the compressor; a third connection mode, in which the first end 31 of the third flow path is connected to the outlet 41 of the compressor, and the first end 11 of the first flow path is connected to the inlet 42 of the compressor; and a fourth connection mode, in which the first end 31 of the third flow path is connected to the outlet 41 of the compressor, and the first end 21 of the second flow path is connected to the inlet 42 of the compressor.
- a switching assembly 90 which may be switched between any two, three or four of the following connection modes: a first connection mode, in which
- the switching assembly 90 capable of being switched among four connection modes is described in the following embodiments, in some embodiments, the switching assembly 90 may only implement any two or three of the above connection modes. In some embodiments, the switching assembly 90 may be composed of a first four-way valve 91, a second four-way valve 92 and several pipelines. The specific operation will be described in detail below in conjunction with the operation modes.
- the heat pump system also includes a control system, which controls the switching assembly 90, the first throttling device 13, the second throttling device 23 and optional components such as other valves and throttling devices in the heat pump system to achieve various functions, including operating the heat pump system in two, three or four of the cooling mode, the heating mode, the hot water preparing mode and the cooling heat recovery mode.
- a control system which controls the switching assembly 90, the first throttling device 13, the second throttling device 23 and optional components such as other valves and throttling devices in the heat pump system to achieve various functions, including operating the heat pump system in two, three or four of the cooling mode, the heating mode, the hot water preparing mode and the cooling heat recovery mode.
- the heat pump system having four modes is described below, the heat pump system may only have any two or three of the above modes in other embodiments.
- the heat pump system is in the cooling mode, and the switching assembly 90 is in the first connection mode, that is, the first four-way valve 91 is in a first position and the second four-way valve 92 is in a first position.
- the first throttling device 13 plays a throttling function, and the second throttling device 23 is fully opened.
- the refrigerant leaving the outlet 41 of the compressor enters the first four-way valve 91 from port a and leaves the first four-way valve 91 from port d , and enters the second four-way valve 92 from port e and leaves the second four-way valve 92 from port f , thus passing through the first flow path 100 in the first flow direction.
- the refrigerant passes through the first heat exchanger 12 and the first throttling device 13.
- the first throttling device 13 may be, for example, a thermal expansion valve or an electronic expansion valve, which plays a throttling function, that is, controlling the superheat degree of the refrigerant.
- the refrigerant After passing through the receiver 5, the refrigerant flows through the second flow path in the second flow direction, including the second throttling device 23 in a fully open state and the second heat exchanger 22. Finally, the refrigerant enters the second four-way valve 92 through port h and leaves the second four-way valve 92 from port g, passes through the separator 6, enters the inlet of the compressor 42 and is compressed by the compressor 4.
- the receiver 5 in the cooling mode, the receiver 5 is always located downstream of the device 13 playing a throttling function, that is, it is in a low-pressure area. Therefore, the refrigerant that can be stored by the receiver 5 is in a low-pressure state, and a degradation of system performance caused by the storage of high-pressure refrigerant in the receiver 5 is avoided.
- FIG. 2 in which the heat pump system is in the heating mode, and the switching assembly 90 is in the second connection mode, that is, the first four-way valve 91 is in the first position and the second four-way valve 92 is in a second position.
- the first throttling device 13 plays a throttling function, and the second throttling device 23 is bypassed.
- the second throttling device 23 is bypassed by a second check valve 26 connected in parallel therewith.
- the refrigerant leaving the outlet 41 of the compressor enters the first four-way valve 91 from port a and leaves the first four-way valve 91 from port d, and enters the second four-way valve 92 through port e and leaves the second four-way valve 92 from port h , thus passing through the second flow path 200 in the first flow direction.
- the refrigerant passes through the second heat exchanger 22 and bypasses the second throttling device 23; that is, through the second check valve 26 connected in parallel with the second throttling device 23, the second throttling device 23 (the second throttling device 23 itself is in a closed state) is bypassed, and the second check valve 26 only allows the fluid flowing toward the second end 24 of the second flow path to pass through. Then, after passing through the receiver 5, the refrigerant flows through the first flow path 100 in the second flow direction, including the first throttling device 13, which again plays a throttling function.
- the refrigerant then passes through the first heat exchanger 12, finally enters the second four-way valve 92 through port f and leaves the second four-way valve 92 from port g, passes through the separator 6, enters the inlet 42 of the compressor and is compressed by the compressor 4.
- the second throttling device 23 can be bypassed by the second check valve 26 connected in parallel with the second throttling device 23, and the second check valve 26 has a lower flow resistance to high-pressure fluid.
- the heat pump system is in the hot water preparing mode
- the switching assembly 90 is in the third connection mode, that is, the first four-way valve 91 is in a second position and the second four-way valve 92 is in the second position.
- the first throttling device 13 plays a throttling function
- the second throttling device 23 is in a closed state.
- the refrigerant leaving the outlet 41 of the compressor enters the first four-way valve 91 from port a and leaves the first four-way valve 91 from port b , thus passing through the third flow path 300 in the first flow direction.
- the refrigerant passes through the third heat exchanger 32 and the second check valve 33; then after passing through the receiver 5, the refrigerant flows through the first flow path 100 in the second flow direction, including the first throttling device 13, which again plays a throttling function.
- the refrigerant then passes through the first heat exchanger 12, finally enters the second four-way valve 92 through port f and leaves the second four-way valve 92 from port g, then passes through the separator 6, enters the inlet 42 of the compressor and is compressed by the compressor 4.
- the third heat exchanger 32 supplies heat to water, thereby producing hot water.
- FIG. 4 in which the heat pump system is in the cooling heat recovery mode, and the switching assembly 90 is in the fourth connection mode, wherein the first four-way valve 91 is in the second position and the second four-way valve 92 is in the first position.
- the second throttling device 23 plays a throttling function, and the first throttling device 13 is in a closed state.
- this cooling heat recovery mode cooling heat recovery cycle
- the refrigerant leaving the outlet 41 of the compressor enters the first four-way valve 91 from port a and leaves the first four-way valve 91 from port b , thus passing through the third flow path 300 in the first flow direction.
- the refrigerant passes through the third heat exchanger 32 and passes through the first check valve 33. Then, the refrigerant flows through the second flow path 200 in the second flow direction (without passing through the receiver 5), including the second throttling device 23 (the second check valve 26 does not allow the fluid in the second flow direction to pass through).
- the second throttling device 23 plays a throttling function, that is, the second throttling device 23 may be a thermal expansion valve or an electronic expansion valve, which plays a role of controlling the superheat degree.
- the refrigerant then passes through the second heat exchanger 22, finally enters the second four-way valve 92 through port h and leaves the second four-way valve 92 from port g, then passes through the separator 6, enters the inlet 42 of the compressor and is compressed by the compressor 4.
- the second heat exchanger 22 performs cooling
- the third heat exchanger 32 recovers heat energy and supplies it to water, thereby producing hot water.
- FIG. 5 differs from the embodiments of FIGS. 1 to 4 in that the receiver 5 only has one pipeline 51, which is a common pipeline for liquid inflow and liquid outflow.
- the second end 14 of the first flow path, the second end 24 of the second flow path, and the second end 34 of the third flow path are directly connected, and the pipeline 51 of the receiver 5 may be connected to the first flow path, the second flow path or the third flow path at or near the point where the second end 14 of the first flow path, the second end 24 of the second flow path, and the second end 34 of the third flow path are connected.
- the pipeline 51 of the receiver 5 may be connected to the first flow path at a position between the first throttling device 13 and the second end 14 of the first flow path, or connected to the second flow path on a main path between the second throttling device 23 and the second end 24 of the second flow path, or connected to the third flow path between the first check valve 33 and the second end 34 of the third flow path.
- the heat pump system according to the embodiment shown in FIG. 5 can also be operated in various modes, which will not be described repeatedly herein.
- FIGS. 6-9 another embodiment will be introduced.
- This embodiment differs from the embodiments of FIGS. 1 to 4 in that the second end 14 of the first flow path and the second end 24 of the second flow path are connected to the first pipeline 52 of the receiver 5, and the second end 34 of the three-flow path is connected to the second pipeline 53 of the receiver 5.
- a solenoid valve 27 and a second check valve 26 are provided, which are connected between the second pipeline 53 of the receiver 5 (or the second end 34 of the third flow path) and a position between the second heat exchanger 22 and the second throttling device 23 on the second flow path.
- the solenoid valve 27 and the second check valve 26 are connected in parallel, and the second check valve 26 only allows the fluid flowing toward the second pipeline 53 of the receiver 5 (i.e., in the second flow direction) to pass through.
- the refrigerant leaving the outlet 41 of the compressor passes through the switching assembly 90 and passes through the first flow path 100 in the first flow direction.
- the first throttling device 13 also plays a throttling function, the second throttling device 23 is closed, and the solenoid valve 27 is in an open state.
- the refrigerant passes through the receiver 5, it bypasses the second throttling device 23 through the solenoid valve 27, enters the second heat exchanger 22, and returns to the inlet 42 of the compressor through the switching assembly 90.
- the refrigerant leaving the outlet 41 of the compressor enters the second flow path 200 in the first flow direction through the switching assembly 90, the second throttling device 23 is closed, and the solenoid valve 27 is in a closed state.
- the high-pressure refrigerant passes through the second check valve 26 with a smaller pressure drop, passes through the receiver 5, and then flows through the first flow path 100 in the second flow direction.
- the first throttling device 13 plays a throttling function, and the refrigerant returns to the inlet 42 of the compressor through the switching assembly 90.
- the refrigerant leaving the outlet 41 of the compressor passes through the switching assembly 90 and enters the third flow path 300 in the first flow direction, the second throttling device 23 is closed, and the solenoid valve 27 is in a closed state.
- the refrigerant flows through the first flow path 100 in the second flow direction after passing through the receiver 5, wherein the first throttling device 13 plays a throttling function, and the refrigerant returns to the inlet 42 of the compressor through the switching assembly 90.
- the refrigerant leaving the outlet 41 of the compressor passes through the switching assembly 90 and enters the third flow path 300 in the first flow direction, the first throttling device 13 is closed, and the solenoid valve 27 is in the closed state.
- the refrigerant flows through the second flow path 200 in the second flow direction after passing through the receiver 5, wherein the second throttling device 23 plays a throttling function, and the refrigerant returns to the inlet 42 of the compressor through the switching assembly 90.
- the use of the solenoid valve to bypass the second throttling device 23 can achieve better performance in the cooling mode. It should be understood that in the embodiments of FIGS. 1 to 5 , a solenoid valve connected in parallel with the second throttling device 23 may also be used to bypass the second throttling device 23 in the cooling mode to improve system performance.
- the dual-pipeline receiver can also function in the cooling heat recovery mode, that is, the dual-pipeline receiver 5 can achieve the function of the adjusting the amount of refrigerant in the system in each of the four modes.
- FIG. 10 differs from the embodiments of FIGS. 6 to 9 in that the compressor 4 is an enhanced vapor injection compressor, which further includes an enhanced vapor injection port 43.
- the heat pump system also includes an economizer 8, and the first flow path 100 includes a branch point P, and a first pipeline 81 passing through the economizer 8, wherein in the heating mode and the hot water preparing mode, the refrigerant flowing from the second end 14 of the first flow path to the first end 11 of the first flow path passes through the first pipeline 81 of the economizer before passing through the first throttling device 13, and is divided at the branch point P into a first part leading to the first throttling device 13 and a second part leading to a branch.
- the second part of the refrigerant passes through an optional filter 85 and a branch throttling device 84 on the branch and a second pipeline 82 of the economizer 8 to exchange heat with the refrigerant in the first pipeline 81 of the economizer 8, and the refrigerant passing through the second pipeline 82 of the economizer 8 is supplied to the enhanced vapor injection port 43 of the compressor.
- the performance of the system can be further improved through the combination of the economizer and the enhanced vapor injection compressor. It should be understood that the combination of the economizer and the enhanced vapor injection compressor in FIG. 10 may also be applied to other embodiments.
- the third flow path does not include a throttling device, and only the first throttling device 13 and the second throttling device 23 are present on the three flow paths.
- the receiver in the cooling mode, is located in a low-pressure area downstream of the throttling device, thereby improving the performance of the heat pump system in the cooling mode.
- the heat pump system includes a cooling working condition, and under the cooling working condition, the heat pump system is switched among the cooling mode, the hot water preparing mode, and the cooling heat recovery mode. For example, when there is a demand for cooling, the heat pump system is switched to the cooling mode; when there is a demand for hot water preparation, the heat pump system is switched to the hot water preparing mode; and when there are demands for both cooling and hot water preparation, the cooling heat recovery mode is executed.
- the heat pump system also includes a heating working condition, and under the heating working condition, the heat pump system is switched between the heating mode and the hot water preparing mode. For example, when there is a demand for heating, the heat pump system is switched to the heating mode; and when there is a demand for hot water preparation, the heat pump system is switched to the hot water preparing mode. In addition, under the heating working condition, the heat pump system can defrost the first heat exchanger 12 by being switched to the first connection mode and fully opening the first throttling device.
- a control method of a heat pump system includes: operating the heat pump system in any two, three, or four of a cooling mode, a heating mode, a hot water preparing mode, and a cooling heat recovery mode; wherein:
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Description
- The present disclosure relates to the technical field of air conditioning and domestic hot water supply device. More specifically, the present disclosure relates to a heat pump system and a control method thereof.
- At present, modular heat pump systems often have multiple paths to meet air conditioning requirements and optional domestic hot water requirements. The various modes are realized through adjustments implemented by a four-way valve and throttling devices on the flow paths. A common setting is that each flow path is equipped with a throttling device and a check valve connected in parallel with it, and each throttling device functions in a different mode.
- An object of at least the preferred embodiments of the present disclosure is to solve or at least alleviate the problems existing in the prior art.
- In one aspect, a heat pump system is provided, which includes:
- a compressor;
- a first flow path, which includes a first end of the first flow path, a first heat exchanger, a first throttling device, and a second end of the first flow path in sequence;
- a second flow path, which includes a first end of a second flow path, a second heat exchanger, a second throttling device, and a second end of the second flow path in sequence;
- a third flow path, which includes a first end of the third flow path, a third heat exchanger, a first check valve, and a second end of the third flow path in sequence, wherein the first check valve on the third flow path only allows a fluid flowing in a direction toward the second end of the third flow path to pass through;
- wherein the second end of the first flow path, the second end of the second flow path and the second end of the third flow path are connected; and
- a switching assembly, which can be switched between any two, three or four of the following connection modes:
- a first connection mode, in which the first end of the first flow path is connected to an outlet of the compressor, and the first end of the second flow path is connected to an inlet of the compressor;
- a second connection mode, in which the first end of the second flow path is connected to the outlet of the compressor, and the first end of the first flow path is connected to the inlet of the compressor;
- a third connection mode, in which the first end of the third flow path is connected to the outlet of the compressor, and the first end of the first flow path is connected to the inlet of the compressor; and
- a fourth connection mode, in which the first end of the third flow path is connected to the outlet of the compressor, and the first end of the second flow path is connected to the inlet of the compressor; and
- a control system, which enables the heat pump system to operate in any two, three, or four of a cooling mode, a heating mode, a hot water preparing mode, and a cooling heat recovery mode;
- in the cooling mode, the switching assembly is switched to the first connection mode, the first throttling device plays a throttling function, and the second throttling device is fully opened or bypassed;
- in the heating mode, the switching assembly is switched to the second connection mode, the first throttling device plays a throttling function, and the second throttling device is bypassed;
- in the hot water preparing mode, the switching assembly is switched to the third connection mode, the first throttling device plays a throttling function, and the second throttling device is in a closed state; and
- in the cooling heat recovery mode, the switching assembly is switched to the fourth connection mode, the second throttling device plays a throttling function, and the first throttling device is in a closed state.
- Optionally, in the heat pump system, the second flow path may include a second check valve connected in parallel with the second throttling device, and the second check valve may only allow a fluid flowing in a direction toward the second end of the second flow path to pass through.
- Optionally, in the heat pump system, the second flow path may include a solenoid valve connected in parallel with the second throttling device, and in the cooling mode, the heat pump system may open the solenoid valve and closes the second throttling device to bypass the second throttling device.
- Optionally, in the heat pump system, the heat pump system may further include a receiver, and the receiver may include a single pipeline and may be connected to or near a position where the second end of the first flow path, the second end of the second flow path and the second end of the third flow path are connected.
- Optionally, in the heat pump system, the heat pump system may further include a receiver which includes a first pipeline and a second pipeline, the second end of the first flow path and the second end of the second flow path may be connected to the first pipeline of the receiver, and the second end of the third flow path may be connected to the second pipeline of the receiver.
- Optionally, in the heat pump system, the heat pump system may further include a solenoid valve, which is connected between the second pipeline of the receiver and a position between the second heat exchanger and the second throttling device on the second flow path.
- Optionally, in the heat pump system, the heat pump system may further include a second check valve, which is connected between the second pipeline of the receiver and a position between the second heat exchanger and the second throttling device on the second flow path, and which only allows a fluid flowing in a direction toward a second end of the second pipeline to pass through.
- Optionally, in the heat pump system, the heat pump system may include a cooling working condition, and under the cooling working condition, the heat pump system may be switched among the cooling mode, the hot water preparing mode, and the cooling heat recovery mode.
- Optionally, in the heat pump system, the heat pump system may include a heating working condition, and under the heating working condition, the heat pump system may be switched between the heating mode and the hot water preparing mode, wherein the heat pump system performs defrosting by being switched to the first connection mode and fully opening the first throttling device.
- Optionally, in the heat pump system, the compressor may be an enhanced vapor injection compressor, the heat pump system may further include an economizer, and the first flow path may include a branch point and passes through a first pipeline of the economizer, wherein in the heating mode and the hot water preparing mode, a refrigerant flowing from the second end of the first flow path toward the first end of the first flow path may pass through the first pipeline of the economizer before passing through the first throttling device, and may be divided at the branch point into a first part leading to the first throttling device and a second part leading to a branch; the second part of the refrigerant may pass through a branch throttling device on the branch and a second pipeline of the economizer to exchange heat with the refrigerant in the first pipeline of the economizer, and the refrigerant passing through the second pipeline of the economizer may be supplied to an enhanced vapor injection port of the compressor.
- Optionally, in the heat pump system, the third flow path may not have a throttling device.
- Optionally, in the heat pump system, the switching assembly may include two four-way valves.
- In another aspect, a control method of a heat pump system is provided, which includes: operating the heat pump system in any two, three, or four of a cooling mode, a heating mode, a hot water preparing mode, and a cooling heat recovery mode; wherein:
- in the cooling mode, the first end of the first flow path is connected to the outlet of the compressor, the first end of the second flow path is connected to the inlet of the compressor, the first throttling device plays a throttling function, and the second throttling device is fully opened or bypassed;
- in the heating mode, the first end of the second flow path is connected to the outlet of the compressor, the first end of the first flow path is connected to the inlet of the compressor, the first throttling device plays a throttling function, and the second throttling device is bypassed;
- in the hot water preparing mode, the first end of the third flow path is connected to the outlet of the compressor, the first end of the first flow path is connected to the inlet of the compressor, the first throttling device plays a throttling function, and the second throttling device is in a closed state; and
- in the cooling heat recovery mode, the first end of the third flow path is connected to the outlet of the compressor, the first end of the first flow path is connected to the inlet of the compressor, the second throttling device plays a throttling function, and the first throttling device is in a closed state.
- Optionally, the method may include operating the heat pump system under a cooling working condition, wherein the heat pump system may be switched among the cooling mode, the hot water preparing mode, and the cooling heat recovery mode.
- Optionally, the method may include operating the heat pump system under a heating working condition, wherein the heat pump system is switched between the heating mode and the hot water preparing mode; optionally, under the heating working condition, the first end of the first flow path may be connected to the outlet of the compressor, the first end of the second flow path may be connected to the inlet of the compressor, and the first throttling device may be fully opened to perform defrost.
- With reference to the accompanying drawings, the disclosure of the present invention will become easier to understand. It can be easily understood by those skilled in the art that these drawings are only for illustrative purpose, and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the drawings are used to denote similar components, in which:
-
FIGS. 1 to 4 show schematic structural diagrams of a heat pump system in different working modes according to an embodiment; -
FIG. 5 shows a schematic structural diagram of a heat pump system according to another embodiment; -
FIGS. 6 to 9 show schematic structural diagrams of a heat pump system in different working modes according to another embodiment; and -
FIG. 10 shows a schematic structural diagram of a heat pump system according to another embodiment. - First, referring to
FIG. 1 , a heat pump system will be introduced. The heat pump system may include: acompressor 4, aswitching assembly 90, afirst flow path 100, asecond flow path 200, athird flow path 300, and a control system (not shown). Thecompressor 4 may include aninlet 42 of the compressor and anoutlet 41 of the compressor. In some embodiments, aseparator 6 may be provided upstream of theinlet 42 of the compressor to remove liquid in the return fluid. Thefirst flow path 100 may include afirst end 11 of the first flow path, afirst heat exchanger 12, afirst throttling device 13 and asecond end 14 of the first flow path in sequence. In some embodiments, thefirst heat exchanger 12 may be a coil heat exchanger and may be located outdoor. Thesecond flow path 200 may include afirst end 21 of the second flow path, asecond heat exchanger 22, asecond throttling device 23, and asecond end 24 of the second flow path in sequence. In some embodiments, thesecond heat exchanger 22 may be a brazed plate heat exchanger and may be located indoor. Thethird flow path 300 may include afirst end 31 of the third flow path, athird heat exchanger 32, afirst check valve 33 and asecond end 34 of the third flow path. In the following, for the sake of clarity, a direction from the first end to the second end of each flow path is defined as a first flow direction of each flow path, and a direction from the second end to the first end of each flow path is defined as a second flow direction of each flow path. Thefirst check valve 33 on the third flow path only allows a fluid flowing in a direction toward the second end of the third flow path, that is, it only allows the fluid flowing in the first flow direction in the third flow path to pass through. In some embodiments, thefirst flow path 100 may include afilter 15 between thefirst heat exchanger 12 and thefirst throttling device 13. In some embodiments, thesecond flow path 200 may include afilter 25 between thesecond heat exchanger 22 and thesecond throttling device 23. In some embodiments, thethird flow path 300 may include afilter 35 between thethird heat exchanger 32 and thefirst check valve 33. Thesecond end 14 of the first flow path, thesecond end 24 of the second flow path and thesecond end 34 of the third flow path are connected. In some embodiments, thesecond end 14 of the first flow path, thesecond end 24 of the second flow path and thesecond end 34 of the third flow path may be directly connected. In the illustrated embodiment, thesecond end 14 of the first flow path is connected to afirst pipeline 52 of anoptional receiver 5, and thesecond end 24 of the second flow path and thesecond end 34 of the third flow path are connected to asecond pipeline 53 of thereceiver 5. The function of thereceiver 5 is to store part of the refrigerant under a condition of excessive refrigerant, and to discharge the refrigerant when more refrigerant is needed. - The heat pump system further includes a switching
assembly 90, which may be switched between any two, three or four of the following connection modes: a first connection mode, in which thefirst end 11 of the first flow path is connected to theoutlet 41 of the compressor, and thefirst end 21 of the second flow path is connected to theinlet 42 of the compressor; a second connection mode, in which thefirst end 21 of the second flow path is connected to theoutlet 41 of the compressor, and thefirst end 11 of the first flow path is connected to theinlet 42 of the compressor; a third connection mode, in which thefirst end 31 of the third flow path is connected to theoutlet 41 of the compressor, and thefirst end 11 of the first flow path is connected to theinlet 42 of the compressor; and a fourth connection mode, in which thefirst end 31 of the third flow path is connected to theoutlet 41 of the compressor, and thefirst end 21 of the second flow path is connected to theinlet 42 of the compressor. It should be understood that although the switchingassembly 90 capable of being switched among four connection modes is described in the following embodiments, in some embodiments, the switchingassembly 90 may only implement any two or three of the above connection modes. In some embodiments, the switchingassembly 90 may be composed of a first four-way valve 91, a second four-way valve 92 and several pipelines. The specific operation will be described in detail below in conjunction with the operation modes. - The heat pump system also includes a control system, which controls the switching
assembly 90, thefirst throttling device 13, thesecond throttling device 23 and optional components such as other valves and throttling devices in the heat pump system to achieve various functions, including operating the heat pump system in two, three or four of the cooling mode, the heating mode, the hot water preparing mode and the cooling heat recovery mode. Similarly, although the heat pump system having four modes is described below, the heat pump system may only have any two or three of the above modes in other embodiments. - As shown in
FIG. 1 , the heat pump system is in the cooling mode, and the switchingassembly 90 is in the first connection mode, that is, the first four-way valve 91 is in a first position and the second four-way valve 92 is in a first position. At this point, thefirst throttling device 13 plays a throttling function, and thesecond throttling device 23 is fully opened. Specifically, in this cooling mode (cooling cycle), the refrigerant leaving theoutlet 41 of the compressor enters the first four-way valve 91 from port a and leaves the first four-way valve 91 from port d, and enters the second four-way valve 92 from port e and leaves the second four-way valve 92 from port f, thus passing through thefirst flow path 100 in the first flow direction. Specifically, the refrigerant passes through thefirst heat exchanger 12 and thefirst throttling device 13. Thefirst throttling device 13 may be, for example, a thermal expansion valve or an electronic expansion valve, which plays a throttling function, that is, controlling the superheat degree of the refrigerant. After passing through thereceiver 5, the refrigerant flows through the second flow path in the second flow direction, including thesecond throttling device 23 in a fully open state and thesecond heat exchanger 22. Finally, the refrigerant enters the second four-way valve 92 through port h and leaves the second four-way valve 92 from port g, passes through theseparator 6, enters the inlet of thecompressor 42 and is compressed by thecompressor 4. It should be noted that in the embodiments of the present disclosure, in the cooling mode, thereceiver 5 is always located downstream of thedevice 13 playing a throttling function, that is, it is in a low-pressure area. Therefore, the refrigerant that can be stored by thereceiver 5 is in a low-pressure state, and a degradation of system performance caused by the storage of high-pressure refrigerant in thereceiver 5 is avoided. - Next, reference is made to
FIG. 2 , in which the heat pump system is in the heating mode, and the switchingassembly 90 is in the second connection mode, that is, the first four-way valve 91 is in the first position and the second four-way valve 92 is in a second position. At this point, thefirst throttling device 13 plays a throttling function, and thesecond throttling device 23 is bypassed. Specifically, thesecond throttling device 23 is bypassed by asecond check valve 26 connected in parallel therewith. Specifically, in this heating mode (heating cycle), the refrigerant leaving theoutlet 41 of the compressor enters the first four-way valve 91 from port a and leaves the first four-way valve 91 from port d, and enters the second four-way valve 92 through port e and leaves the second four-way valve 92 from port h, thus passing through thesecond flow path 200 in the first flow direction. Specifically, the refrigerant passes through thesecond heat exchanger 22 and bypasses thesecond throttling device 23; that is, through thesecond check valve 26 connected in parallel with thesecond throttling device 23, the second throttling device 23 (thesecond throttling device 23 itself is in a closed state) is bypassed, and thesecond check valve 26 only allows the fluid flowing toward thesecond end 24 of the second flow path to pass through. Then, after passing through thereceiver 5, the refrigerant flows through thefirst flow path 100 in the second flow direction, including thefirst throttling device 13, which again plays a throttling function. The refrigerant then passes through thefirst heat exchanger 12, finally enters the second four-way valve 92 through port f and leaves the second four-way valve 92 from port g, passes through theseparator 6, enters theinlet 42 of the compressor and is compressed by thecompressor 4. In this embodiment, thesecond throttling device 23 can be bypassed by thesecond check valve 26 connected in parallel with thesecond throttling device 23, and thesecond check valve 26 has a lower flow resistance to high-pressure fluid. - Next, reference is made to
FIG. 3 , in which the heat pump system is in the hot water preparing mode, and the switchingassembly 90 is in the third connection mode, that is, the first four-way valve 91 is in a second position and the second four-way valve 92 is in the second position. At this point, thefirst throttling device 13 plays a throttling function, and thesecond throttling device 23 is in a closed state. Specifically, in this hot water preparing mode (hot water preparing cycle), the refrigerant leaving theoutlet 41 of the compressor enters the first four-way valve 91 from port a and leaves the first four-way valve 91 from port b, thus passing through thethird flow path 300 in the first flow direction. Specifically, the refrigerant passes through thethird heat exchanger 32 and thesecond check valve 33; then after passing through thereceiver 5, the refrigerant flows through thefirst flow path 100 in the second flow direction, including thefirst throttling device 13, which again plays a throttling function. The refrigerant then passes through thefirst heat exchanger 12, finally enters the second four-way valve 92 through port f and leaves the second four-way valve 92 from port g, then passes through theseparator 6, enters theinlet 42 of the compressor and is compressed by thecompressor 4. In the hot water preparing mode, thethird heat exchanger 32 supplies heat to water, thereby producing hot water. - Next, reference is made to
FIG. 4 , in which the heat pump system is in the cooling heat recovery mode, and the switchingassembly 90 is in the fourth connection mode, wherein the first four-way valve 91 is in the second position and the second four-way valve 92 is in the first position. In this mode, thesecond throttling device 23 plays a throttling function, and thefirst throttling device 13 is in a closed state. Specifically, in this cooling heat recovery mode (cooling heat recovery cycle), the refrigerant leaving theoutlet 41 of the compressor enters the first four-way valve 91 from port a and leaves the first four-way valve 91 from port b, thus passing through thethird flow path 300 in the first flow direction. Specifically, the refrigerant passes through thethird heat exchanger 32 and passes through thefirst check valve 33. Then, the refrigerant flows through thesecond flow path 200 in the second flow direction (without passing through the receiver 5), including the second throttling device 23 (thesecond check valve 26 does not allow the fluid in the second flow direction to pass through). In this cycle, thesecond throttling device 23 plays a throttling function, that is, thesecond throttling device 23 may be a thermal expansion valve or an electronic expansion valve, which plays a role of controlling the superheat degree. The refrigerant then passes through thesecond heat exchanger 22, finally enters the second four-way valve 92 through port h and leaves the second four-way valve 92 from port g, then passes through theseparator 6, enters theinlet 42 of the compressor and is compressed by thecompressor 4. In the cooling heat recovery mode, thesecond heat exchanger 22 performs cooling, and thethird heat exchanger 32 recovers heat energy and supplies it to water, thereby producing hot water. - Therefore, it is possible to use only two throttling devices to realize a free switching among the above four modes.
- Next, reference is made to
FIG. 5 , which differs from the embodiments ofFIGS. 1 to 4 in that thereceiver 5 only has onepipeline 51, which is a common pipeline for liquid inflow and liquid outflow. In such an embodiment, thesecond end 14 of the first flow path, thesecond end 24 of the second flow path, and thesecond end 34 of the third flow path are directly connected, and thepipeline 51 of thereceiver 5 may be connected to the first flow path, the second flow path or the third flow path at or near the point where thesecond end 14 of the first flow path, thesecond end 24 of the second flow path, and thesecond end 34 of the third flow path are connected. For example, thepipeline 51 of thereceiver 5 may be connected to the first flow path at a position between thefirst throttling device 13 and thesecond end 14 of the first flow path, or connected to the second flow path on a main path between thesecond throttling device 23 and thesecond end 24 of the second flow path, or connected to the third flow path between thefirst check valve 33 and thesecond end 34 of the third flow path. The heat pump system according to the embodiment shown inFIG. 5 can also be operated in various modes, which will not be described repeatedly herein. - Next, referring to
FIGS. 6-9 , another embodiment will be introduced. This embodiment differs from the embodiments ofFIGS. 1 to 4 in that thesecond end 14 of the first flow path and thesecond end 24 of the second flow path are connected to thefirst pipeline 52 of thereceiver 5, and thesecond end 34 of the three-flow path is connected to thesecond pipeline 53 of thereceiver 5. In addition, asolenoid valve 27 and asecond check valve 26 are provided, which are connected between thesecond pipeline 53 of the receiver 5 (or thesecond end 34 of the third flow path) and a position between thesecond heat exchanger 22 and thesecond throttling device 23 on the second flow path. Thesolenoid valve 27 and thesecond check valve 26 are connected in parallel, and thesecond check valve 26 only allows the fluid flowing toward thesecond pipeline 53 of the receiver 5 (i.e., in the second flow direction) to pass through. - In this embodiment, in the cooling mode shown in
FIG. 6 , the refrigerant leaving theoutlet 41 of the compressor passes through the switchingassembly 90 and passes through thefirst flow path 100 in the first flow direction. At this point, thefirst throttling device 13 also plays a throttling function, thesecond throttling device 23 is closed, and thesolenoid valve 27 is in an open state. After the refrigerant passes through thereceiver 5, it bypasses thesecond throttling device 23 through thesolenoid valve 27, enters thesecond heat exchanger 22, and returns to theinlet 42 of the compressor through the switchingassembly 90. - In the heating mode shown in
FIG. 7 , the refrigerant leaving theoutlet 41 of the compressor enters thesecond flow path 200 in the first flow direction through the switchingassembly 90, thesecond throttling device 23 is closed, and thesolenoid valve 27 is in a closed state. At this point, the high-pressure refrigerant passes through thesecond check valve 26 with a smaller pressure drop, passes through thereceiver 5, and then flows through thefirst flow path 100 in the second flow direction. Thefirst throttling device 13 plays a throttling function, and the refrigerant returns to theinlet 42 of the compressor through the switchingassembly 90. - In the hot water preparing mode shown in
FIG. 8 , the refrigerant leaving theoutlet 41 of the compressor passes through the switchingassembly 90 and enters thethird flow path 300 in the first flow direction, thesecond throttling device 23 is closed, and thesolenoid valve 27 is in a closed state. At this point, the refrigerant flows through thefirst flow path 100 in the second flow direction after passing through thereceiver 5, wherein thefirst throttling device 13 plays a throttling function, and the refrigerant returns to theinlet 42 of the compressor through the switchingassembly 90. - In the cooling heat recovery mode shown in
FIG. 9 , the refrigerant leaving theoutlet 41 of the compressor passes through the switchingassembly 90 and enters thethird flow path 300 in the first flow direction, thefirst throttling device 13 is closed, and thesolenoid valve 27 is in the closed state. At this point, the refrigerant flows through thesecond flow path 200 in the second flow direction after passing through thereceiver 5, wherein thesecond throttling device 23 plays a throttling function, and the refrigerant returns to theinlet 42 of the compressor through the switchingassembly 90. - With the arrangement of
FIGS. 6-9 , the use of the solenoid valve to bypass thesecond throttling device 23 can achieve better performance in the cooling mode. It should be understood that in the embodiments ofFIGS. 1 to 5 , a solenoid valve connected in parallel with thesecond throttling device 23 may also be used to bypass thesecond throttling device 23 in the cooling mode to improve system performance. In addition, through the arrangements ofFIGS. 6-9 , the dual-pipeline receiver can also function in the cooling heat recovery mode, that is, the dual-pipeline receiver 5 can achieve the function of the adjusting the amount of refrigerant in the system in each of the four modes. - Next, reference is made to
FIG. 10 , which differs from the embodiments ofFIGS. 6 to 9 in that thecompressor 4 is an enhanced vapor injection compressor, which further includes an enhancedvapor injection port 43. The heat pump system also includes aneconomizer 8, and thefirst flow path 100 includes a branch point P, and afirst pipeline 81 passing through theeconomizer 8, wherein in the heating mode and the hot water preparing mode, the refrigerant flowing from thesecond end 14 of the first flow path to thefirst end 11 of the first flow path passes through thefirst pipeline 81 of the economizer before passing through thefirst throttling device 13, and is divided at the branch point P into a first part leading to thefirst throttling device 13 and a second part leading to a branch. The second part of the refrigerant passes through anoptional filter 85 and abranch throttling device 84 on the branch and asecond pipeline 82 of theeconomizer 8 to exchange heat with the refrigerant in thefirst pipeline 81 of theeconomizer 8, and the refrigerant passing through thesecond pipeline 82 of theeconomizer 8 is supplied to the enhancedvapor injection port 43 of the compressor. The performance of the system can be further improved through the combination of the economizer and the enhanced vapor injection compressor. It should be understood that the combination of the economizer and the enhanced vapor injection compressor inFIG. 10 may also be applied to other embodiments. - In the embodiments, only two sets of throttling devices are required to be used to switch between the four modes, which saves the cost of more throttling devices or control valves. In some embodiments, the third flow path does not include a throttling device, and only the
first throttling device 13 and thesecond throttling device 23 are present on the three flow paths. In addition, in the embodiments according to the present disclosure, in the cooling mode, the receiver is located in a low-pressure area downstream of the throttling device, thereby improving the performance of the heat pump system in the cooling mode. - The heat pump system includes a cooling working condition, and under the cooling working condition, the heat pump system is switched among the cooling mode, the hot water preparing mode, and the cooling heat recovery mode. For example, when there is a demand for cooling, the heat pump system is switched to the cooling mode; when there is a demand for hot water preparation, the heat pump system is switched to the hot water preparing mode; and when there are demands for both cooling and hot water preparation, the cooling heat recovery mode is executed.
- The heat pump system also includes a heating working condition, and under the heating working condition, the heat pump system is switched between the heating mode and the hot water preparing mode. For example, when there is a demand for heating, the heat pump system is switched to the heating mode; and when there is a demand for hot water preparation, the heat pump system is switched to the hot water preparing mode. In addition, under the heating working condition, the heat pump system can defrost the
first heat exchanger 12 by being switched to the first connection mode and fully opening the first throttling device. - In another aspect, a control method of a heat pump system is also provided, which includes: operating the heat pump system in any two, three, or four of a cooling mode, a heating mode, a hot water preparing mode, and a cooling heat recovery mode; wherein:
- in the cooling mode, the first end of the first flow path is connected to the outlet of the compressor, the first end of the second flow path is connected to the inlet of the compressor, the first throttling device plays a throttling function, and the second throttling device is fully opened or bypassed;
- in the heating mode, the first end of the second flow path is connected to the outlet of the compressor, the first end of the first flow path is connected to the inlet of the compressor, the first throttling device plays a throttling function, and the second throttling device is bypassed;
- in the hot water preparing mode, the first end of the third flow path is connected to the outlet of the compressor, the first end of the first flow path is connected to the inlet of the compressor, the first throttling device plays a throttling function, and the second throttling device is closed; and
- in the cooling heat recovery mode, the first end of the third flow path is connected to the outlet of the compressor, the first end of the first flow path is connected to the inlet of the compressor, the second throttling device plays a throttling function, and the first throttling device is closed.
- The specific embodiments described above are merely for describing the principle of the present disclosure more clearly, and various components are clearly illustrated or depicted to make it easier to understand the principle of the present disclosure. Those skilled in the art can readily make various modifications or changes to the present disclosure without departing from the scope of the present invention, which is defined by the claims.
Claims (15)
- A heat pump system, comprising:a compressor (4);a first flow path (100), which comprises a first end (11) of the first flow path (100), a first heat exchanger (12), a first throttling device (13), and a second end (14) of the first flow path (100) in sequence;a second flow path (200), which comprises a first end (21) of the second flow path (200), a second heat exchanger (22), a second throttling device (23), and a second end (24) of the second flow path (200) in sequence;a third flow path (300), which comprises a first end (31) of the third flow path (300), a third heat exchanger (32), a first check valve (33), and a second end (34) of the third flow (100) path in sequence, wherein the first check valve (33) on the third flow path (300) only allows a fluid flowing in a direction toward the second end (34) of the third flow path (300) to pass through;wherein the second end (14) of the first flow path (100), the second end (24) of the second flow path (200) and the second end (34) of the third flow path (300) are connected;a switching assembly (90), which can be switched between any two, three or four of the following connection modes:a first connection mode, in which the first end (11) of the first flow path (100) is connected to an outlet (41) of the compressor (4), and the first end (21) of the second flow path (200) is connected to an inlet (42) of the compressor (4);a second connection mode, in which the first end (21) of the second flow path (200) is connected to the outlet (41) of the compressor (4), and the first end (11) of the first flow path (100) is connected to the inlet (42) of the compressor (4);a third connection mode, in which the first end (31) of the third flow path (300) is connected to the outlet (41) of the compressor (4), and the first end (11) of the first flow path (100) is connected to the inlet (42) of the compressor (4); anda fourth connection mode, in which the first end (31) of the third flow path (300) is connected to the outlet (41) of the compressor (4), and the first end (21) of the second flow path (200) is connected to the inlet (42) of the compressor (4); anda control system, which enables the heat pump system to operate in any two, three, or four of a cooling mode, a heating mode, a hot water preparing mode, and a cooling heat recovery mode, wherein:in the cooling mode, the switching assembly (90) is switched to the first connection mode, the first throttling device (13) plays a throttling function, and the second throttling device (23) is fully opened or bypassed;in the heating mode, the switching assembly (90) is switched to the second connection mode, the first throttling device (13) plays a throttling function, and the second throttling device (23) is bypassed;in the hot water preparing mode, the switching assembly (90) is switched to the third connection mode, the first throttling (13) device plays a throttling function, and the second throttling device (23) is in a closed state; andin the cooling heat recovery mode, the switching assembly (90) is switched to the fourth connection mode, the second throttling device (23) plays a throttling function, and the first throttling device (13) is in a closed state.
- The heat pump system according to claim 1, wherein the second flow path (200) comprises a second check valve (26) connected in parallel with the second throttling device (23), and the second check valve (26) only allows a fluid flowing in a direction toward the second end (24) of the second flow path (200) to pass through.
- The heat pump system according to claim 1 or 2, wherein the second flow path (200) comprises a solenoid valve (27) connected in parallel with the second throttling device (23), and in the cooling mode, in the heat pump system, the solenoid valve (27) is opened and the second throttling device (23) is closed to bypass the second throttling device (23).
- The heat pump system according to any one of claims 1 to 3, wherein the heat pump system further comprises a receiver (5), and the receiver (5) comprises a single pipeline (51) and is connected to or near a position where the second end (14) of the first flow path (100), the second end (24) of the second flow path (200) and the second end (34) of the third flow path (300) are connected.
- The heat pump system according to any one of claims 1 to 3, wherein the heat pump system further comprises a receiver (5) which comprises a first pipeline (52) and a second pipeline (53), the second end (14) of the first flow path (100) and the second end (24) of the second flow path (200) are connected to the first pipeline (52) of the receiver (5), and the second end (34) of the third flow path (300) is connected to the second pipeline (53) of the receiver (5).
- The heat pump system according to claim 5, wherein the heat pump system further comprises a solenoid valve (27), which is connected between the second pipeline (53) of the receiver (5) and a position on the second flow path (200) between the second heat exchanger (22) and the second throttling device (23).
- The heat pump system according to claim 5 or 6, wherein the heat pump system further comprises a second check valve (26), which is connected between the second pipeline (53) of the receiver (5) and a position on the second flow path (200) between the second heat exchanger (22) and the second throttling device (23), and which only allows a fluid flowing in a direction toward a second end (24) of the second pipeline (200) to pass through.
- The heat pump system according to any one of claims 1 to 7, wherein the heat pump system comprises a cooling working condition, and under the cooling working condition, the heat pump system is switched among the cooling mode, the hot water preparing mode, and the cooling heat recovery mode.
- The heat pump system according to any one of claims 1 to 8, wherein the heat pump system comprises a heating working condition, and under the heating working condition, the heat pump system is switched between the heating mode and the hot water preparing mode, wherein the heat pump system performs defrosting by being switched to the first connection mode and fully opening the first throttling device.
- The heat pump system according to any one of claims 1 to 9, wherein the compressor (4) is an enhanced vapor injection compressor, the heat pump system further comprises an economizer (8), and the first flow path (100) comprises a branch point (P) and passes through a first pipeline (81) of the economizer (8), and wherein in the heating mode and the hot water preparing mode, a refrigerant flowing from the second end (14) of the first flow path (100) toward the first end (11) of the first flow path (100) passes through the first pipeline (81) of the economizer (8) before passing through the first throttling device (13), and is divided at the branch point (P) into a first part leading to the first throttling device (13) and a second part leading to a branch; the second part of the refrigerant passes through a branch throttling device (84) on the branch and a second pipeline (82) of the economizer (8) to exchange heat with the refrigerant in the first pipeline (81) of the economizer (8), and the refrigerant passing through the second pipeline (82) of the economizer (8) is supplied to an enhanced vapor injection port (43) of the compressor (4).
- The heat pump system according to any one of claims 1 to 10, wherein the third flow path does not have a throttling device.
- The heat pump system according to any one of claims 1 to 11, wherein the switching assembly comprises two four-way valves (91, 92).
- A control method for a heat pump system, the heat pump system comprising:a compressor (4);a first flow path (100), which comprises a first end (11) of the first flow path (100), a first heat exchanger (12), a first throttling device (13), and a second end (14) of the first flow path (100) in sequence;a second flow path (200), which comprises a first end (21) of the second flow path, a second heat exchanger (22), a second throttling device (23), and a second end (24) of the second flow path (200) in sequence;a third flow path (300), which comprises a first end (31) of the third flow path (300), a third heat exchanger (32), a first check valve (33), and a second end (34) of the third flow path (300) in sequence, wherein the first check valve (33) on the third flow path (300) only allows a fluid flowing in a direction toward the second end (34) of the third flow path (300) to pass through;wherein the second end (14) of the first flow path (100), the second end (24) of the second flow path (200) and the second end (34) of the third flow path (300) are connected;the method comprising:
operating the heat pump system in any two, three, or four of a cooling mode, a heating mode, a hot water preparing mode, and a cooling heat recovery mode, wherein:in the cooling mode, the first end (11) of the first flow path (100) is connected to the outlet (41) of the compressor (4), the first end (21) of the second flow path (200) is connected to the inlet (42) of the compressor (4), the first throttling device (13) plays a throttling function, and the second throttling device (23) is fully opened or bypassed;in the heating mode, the first end (21) of the second flow path (200) is connected to the outlet (41) of the compressor (4), the first end (11) of the first flow path (100) is connected to the inlet (42) of the compressor (4), the first throttling device (13) plays a throttling function, and the second throttling device (23) is bypassed;in the hot water preparing mode, the first end (31) of the third flow path (300) is connected to the outlet (41) of the compressor (4), the first end (11) of the first flow path (100) is connected to the inlet (42) of the compressor (4), the first throttling device (13) plays a throttling function, and the second throttling device (23) is closed; andin the cooling heat recovery mode, the first end (31) of the third flow path (300) is connected to the outlet (41) of the compressor (4), the first end (11) of the second flow path (200) is connected to the inlet (42) of the compressor, the second throttling device (23) plays a throttling function, and the first throttling device (12) is closed. - The method according to claim 13, wherein the method comprises:
operating the heat pump system under a cooling working condition, wherein the heat pump system is switched among the cooling mode, the hot water preparing mode, and the cooling heat recovery mode. - The method according to claim 13 or 14, wherein the method comprises:operating the heat pump system under a heating working condition, wherein the heat pump system is switched between the heating mode and the hot water preparing mode; andunder the heating working condition, connecting the first end of the first flow path to the outlet of the compressor, connecting the first end of the second flow path to the inlet of the compressor, and fully opening the first throttling device to perform defrost.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010758274.2A CN114061168A (en) | 2020-07-31 | 2020-07-31 | Heat pump system and control method thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3945267A1 true EP3945267A1 (en) | 2022-02-02 |
Family
ID=73855902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20215663.4A Pending EP3945267A1 (en) | 2020-07-31 | 2020-12-18 | Heat pump system and control method thereof |
Country Status (3)
Country | Link |
---|---|
US (1) | US20220034565A1 (en) |
EP (1) | EP3945267A1 (en) |
CN (1) | CN114061168A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3933302B1 (en) | 2020-06-30 | 2023-01-25 | Trane International Inc. | Dynamic liquid receiver and control strategy |
US11519646B2 (en) * | 2020-08-28 | 2022-12-06 | Rheem Manufacturing Company | Heat pump systems with gas bypass and methods thereof |
EP4283218A1 (en) * | 2022-05-27 | 2023-11-29 | Trane International Inc. | Heating, ventilation, air conditioning, and refrigeration (hvacr) system and associated method of controlling |
CN115468329B (en) * | 2022-09-13 | 2023-10-13 | 约克广州空调冷冻设备有限公司 | heat pump system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2610559A2 (en) * | 2012-01-02 | 2013-07-03 | Samsung Electronics Co., Ltd | Heat pump and control method thereof |
WO2015023354A1 (en) * | 2013-08-14 | 2015-02-19 | Carrier Corporation | Heat pump system, heat pump unit using the same, and method for controlling multiple functional modes thereof |
WO2018208539A1 (en) * | 2017-05-12 | 2018-11-15 | Carrier Corporation | Heat pump and control method thereof |
EP3415839A1 (en) * | 2016-02-10 | 2018-12-19 | Mitsubishi Electric Corporation | Refrigeration cycle device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7299649B2 (en) * | 2003-12-09 | 2007-11-27 | Emerson Climate Technologies, Inc. | Vapor injection system |
CN105823267B (en) * | 2015-01-08 | 2020-06-05 | 开利公司 | Heat pump system and adjusting method thereof |
KR101787075B1 (en) * | 2016-12-29 | 2017-11-15 | 이래오토모티브시스템 주식회사 | Heat Pump For a Vehicle |
WO2020203708A1 (en) * | 2019-03-29 | 2020-10-08 | ダイキン工業株式会社 | Refrigeration cycle device |
-
2020
- 2020-07-31 CN CN202010758274.2A patent/CN114061168A/en active Pending
- 2020-12-18 EP EP20215663.4A patent/EP3945267A1/en active Pending
- 2020-12-24 US US17/133,769 patent/US20220034565A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2610559A2 (en) * | 2012-01-02 | 2013-07-03 | Samsung Electronics Co., Ltd | Heat pump and control method thereof |
WO2015023354A1 (en) * | 2013-08-14 | 2015-02-19 | Carrier Corporation | Heat pump system, heat pump unit using the same, and method for controlling multiple functional modes thereof |
EP3415839A1 (en) * | 2016-02-10 | 2018-12-19 | Mitsubishi Electric Corporation | Refrigeration cycle device |
WO2018208539A1 (en) * | 2017-05-12 | 2018-11-15 | Carrier Corporation | Heat pump and control method thereof |
Also Published As
Publication number | Publication date |
---|---|
US20220034565A1 (en) | 2022-02-03 |
CN114061168A (en) | 2022-02-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3945267A1 (en) | Heat pump system and control method thereof | |
CN101589273B (en) | Air conditioner | |
JP2008513725A (en) | Heat pump with reheat and economizer functions | |
EP1816416A1 (en) | Air conditioner | |
CN107178833B (en) | Heat recovery external machine system and air conditioning system | |
US11313597B2 (en) | Heat pump and control method thereof | |
CN106716027B (en) | Heat pump with ejector | |
EP1781999A4 (en) | Flash tank for heat pump in heating and cooling modes of operation | |
CN105823267B (en) | Heat pump system and adjusting method thereof | |
CN113970194B (en) | Heat pump system | |
CN112752933B (en) | Air conditioning system | |
EP3455563B1 (en) | One method to mitigate vibration and sound level in heat pump chiller with evi function | |
CN110131914B (en) | Four-way valve and air conditioning system | |
KR101872783B1 (en) | Outdoor heat exchanger | |
CN111059732A (en) | Air conditioner and control method thereof | |
KR102337394B1 (en) | Air Conditioner | |
US11913680B2 (en) | Heat pump system | |
TWI803677B (en) | Refrigeration system | |
CN216769620U (en) | Heat exchange assembly, outdoor unit and air conditioning system | |
EP4339535A1 (en) | Heat pump with ejector | |
CN112361648B (en) | Compressor, heat pump system, and method for controlling heat pump system | |
CN216769618U (en) | Heat exchange assembly, outdoor unit and air conditioning system | |
CN110094546B (en) | Four-way valve and air conditioning system | |
CN117663528A (en) | Heat pump system and control method thereof | |
KR102122568B1 (en) | An air conditioning system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20220802 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230527 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20231211 |