CN114061168A - Heat pump system and control method thereof - Google Patents
Heat pump system and control method thereof Download PDFInfo
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- CN114061168A CN114061168A CN202010758274.2A CN202010758274A CN114061168A CN 114061168 A CN114061168 A CN 114061168A CN 202010758274 A CN202010758274 A CN 202010758274A CN 114061168 A CN114061168 A CN 114061168A
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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
- 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
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- 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
The embodiment of the invention provides a heat pump system and a control method thereof. The heat pump system according to the embodiment includes: a compressor; the first flow path, the second flow path and the third flow path, 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 two of the first flow path first end, the second flow path first end, and the third flow path first end are connected to the inlet and the outlet of the compressor by a switching assembly in a specific manner, thereby enabling the heat pump system to operate in one or more of a cooling mode, a heating mode, a hot water heating mode, and a cooling heat recovery mode. The heat pump system according to the embodiment has a simplified structure.
Description
Technical Field
The present invention relates to the field of air conditioning and domestic hot water supply equipment, and more particularly, to a heat pump system and a control method thereof.
Background
Currently, modular heat pump systems often have multiple passes to meet air conditioning needs and optionally domestic hot water needs. The modes are realized by the four-way valve and the throttling device on the flow path. A common arrangement is to provide each flow path with a restriction and a one-way valve connected in parallel with it, each restriction acting in a different mode.
Disclosure of Invention
It is an object of the present invention to solve or at least alleviate problems in the prior art.
In one aspect, a heat pump system is provided, comprising:
a compressor;
a first flow path comprising, in order: a first flow path first end, a first heat exchanger, a first throttling device and a first flow path second end;
a second flow path comprising, in order: a second flow path first end, a second heat exchanger, a second throttling device and a second flow path second end;
a third flow path comprising, in order: the first check valve on the third flow path only allows fluid flowing towards the direction of the second end of the third flow path to pass through;
wherein the first flow path second end, the second flow path second end and the third flow path second end are connected; and
a switching component that can switch between any two, three or four of the following connections:
a first connection, the first flow path first end connected to the compressor outlet and the second flow path first end connected to the compressor inlet;
a second connection, the second flow path first end connected to the compressor outlet and the first flow path first end connected to the compressor inlet;
a third connection, the third flow path first end connected to the compressor outlet and the first flow path first end connected to the compressor inlet;
a fourth connection, the third flow path first end connected to the compressor outlet and the second flow path first end connected to the compressor inlet; and
a control system that enables the heat pump system to operate in any two, three, or four of a cooling mode, a heating mode, a hot water mode, and a cooling heat recovery mode;
in the refrigeration mode, the switching component is switched to a first connection mode, the first throttling unit plays a throttling role, and the second throttling unit is fully opened or bypassed;
in the heating mode, the switching component is switched to a second connection mode, the first throttling unit plays a throttling role, and the second throttling unit is bypassed;
in the hot water making mode, the switching assembly is switched to a third connection mode, the first throttling unit plays a throttling role, and the second throttling unit is in a closed state;
in the cooling heat recovery mode, the switching component is switched to a fourth connection mode, the second throttling unit plays a throttling role, and the first throttling unit is in a closed state.
Optionally, in the heat pump system, the second flow path includes a second check valve connected in parallel with the second throttle device, the second check valve allowing only fluid flowing toward the second end of the second flow path to pass therethrough.
Optionally, in the heat pump system, the second flow path includes a solenoid valve connected in parallel with the second throttle device, and the heat pump system opens the solenoid valve and closes the second throttle device to bypass the second throttle device in the cooling mode.
Optionally, in the heat pump system, the heat pump system further comprises an accumulator comprising a single line and connected to the first flow path second end, the second flow path second end, and the third flow path second end at or near their connection locations.
Optionally, in the heat pump system, the heat pump system further includes an accumulator, the accumulator includes a first pipe and a second pipe, the first flow path second end and the second flow path second end are connected to the first pipe of the accumulator, and the third flow path second end is connected to the second pipe of the accumulator.
Optionally, in the heat pump system, the heat pump system further includes a solenoid valve connected between a position on the second flow path between the second heat exchanger and the second throttling device and the second line of the accumulator.
Optionally, in the heat pump system, the heat pump system further includes a second check valve, which is connected between a position on the second flow path between the second heat exchanger and the second throttling device and the second line of the accumulator, and allows only fluid flowing in a direction toward the second end of the second line to pass through.
Optionally, in the heat pump system, the heat pump system includes a refrigeration condition, and under the refrigeration condition, the heat pump system is switched among a refrigeration mode, a hot water heating mode and a refrigeration heat recovery mode.
Optionally, in the heat pump system, the heat pump system includes a heating condition in which the heat pump system switches between a heating mode and a hot water mode, wherein the heat pump system performs defrosting by switching to the first connection mode and fully opening the first throttle device.
Optionally, in the heat pump system, the compressor is a vapor injection enthalpy compressor, the heat pump system further comprises an economizer, the first flow path comprises a branch point and a first line passing through the economizer, wherein in the heating mode and the heating water mode, the refrigerant flowing from the first flow path second end to the first flow path first end passes through the first pipe line of the economizer before passing through the first throttling device, and is divided at a branch point into a first part leading to said first throttle means and a second part leading to the branch, a second portion of the refrigerant passes through a branch throttling device on the branch line and the second line of the economizer to exchange heat with the refrigerant in the first line of the economizer, and the refrigerant passing through the second line of the economizer is provided to a vapor injection enthalpy addition port of the compressor.
Optionally, in the heat pump system, the third flow path does not have a throttling device.
Optionally, in the heat pump system, the switching assembly comprises two four-way valves.
In another aspect, a method of controlling a heat pump system is provided, the method including: the heat pump system is operated in any two, three or four of a refrigeration mode, a heating mode, a hot water heating mode and a refrigeration heat recovery mode;
in the cooling mode, 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 throttling the first throttling unit to make the second throttling unit fully open or bypassed;
in the heating mode, connecting the first end of the second flow path to the compressor outlet, connecting the first end of the first flow path to the compressor inlet, and throttling the first throttling unit and bypassing the second throttling unit;
in the hot water making mode, connecting the first end of the third flow path to the outlet of the compressor, connecting the first end of the first flow path to the inlet of the compressor, throttling the first throttling unit, and closing the second throttling unit; and
in the cooling and 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 unit is throttled, and the first throttling unit is closed.
Optionally, the method comprises: and the heat pump system is enabled to run under the refrigerating working condition, wherein the heat pump system is enabled to be switched among a refrigerating mode, a hot water heating mode and a refrigerating heat recovery mode.
Optionally, the method comprises: operating the heat pump system in a heating condition, wherein the heat pump system is switched between a heating mode and a hot water mode, optionally, in the heating condition, connecting the first flow path first end to the compressor outlet, connecting the second flow path first end to the compressor inlet, and fully opening the first throttle device for defrosting.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Moreover, in the drawings, like numerals are used to indicate like parts, and in which:
fig. 1 to 4 show schematic structural diagrams of a heat pump system in different operation modes according to an embodiment;
FIG. 5 shows a schematic diagram of a heat pump system according to another embodiment;
fig. 6 to 9 show schematic structural diagrams of a heat pump system according to another embodiment in different operation modes; and
fig. 10 shows a schematic configuration of a heat pump system according to another embodiment.
Detailed Description
A heat pump system according to an embodiment of the present invention will be described first with reference to fig. 1. The heat pump system may include: compressor 4, switching assembly 90, first flow path 100, second flow path 200, third flow path 300, and a control system (not shown). The compressor 4 may include a compressor inlet 42 and an outlet 41. In some embodiments, a separator 6 may be provided upstream of the compressor inlet 42 to remove liquid from the return fluid. The first flow path 100 may include, in order: a first flow path first end 11, a first heat exchanger 12, a first throttling device 13 and a first flow path second end 14. In some embodiments, first heat exchanger 12 may be a coil heat exchanger and may be located outdoors. The second flow path 200 may include, in order: a second flow path first end 21, a second heat exchanger 22, a second throttling device 23 and a second flow path second end 24. In some embodiments, second heat exchanger 22 may be a brazed plate heat exchanger, which may be located within a chamber. The third flow path 300 may include: a third flow path first end 31, a third heat exchanger 32, a first check valve 33, and a third flow path second end 34. Hereinafter, for clarity, the first flow direction of each flow path is defined as the direction of flow from the first end to the second end of each flow path, and the second flow direction of each flow path is defined as the direction of flow from the second end to the first end of each flow path. The first check valve 33 in the third flow path allows passage of only fluid flowing in the direction of the second end of the third flow path, i.e., allows passage of only fluid flowing in the first flow direction in the third flow path. In some embodiments, in the first flow path 100, a filter 15 may be included between the first heat exchanger 12 and the first throttling device 13. In some embodiments, in the second flow path 200, a filter 25 may be included between the second heat exchanger 22 and the second throttling device 23. In some embodiments, in the third flow path 300, a filter 35 may be included between the third heat exchanger 32 and the first check valve 33. In an embodiment of the present invention, the first flow path second end 14, the second flow path second end 24 and the third flow path second end 34 are connected. In some embodiments, the first flow path second end 14, the second flow path second end 24, and the third flow path second end 34 may be directly connected. In the illustrated embodiment, the first flow path second end 14 is connected to a first line 52 of the optional reservoir 5, and the second flow path second end 24 and the third flow path second end 34 are connected to a second line 53 of the reservoir 5. The accumulator 5 serves to store part of the refrigerant in the event of excess refrigerant and to discharge the refrigerant when more refrigerant is needed.
The heat pump system further includes a switching assembly 90, the switching assembly 90 being switchable between any two, three or four of the following connections: a first connection, the first flow path first end 11 being connected to the compressor outlet 41 and the second flow path first end 21 being connected to the compressor inlet 42; a second connection, the second flow path first end 21 being connected to the compressor outlet 41 and the first flow path first end 11 being connected to said compressor inlet 42; a third connection, the third flow path first end 31 being connected to the compressor outlet 41 and the first flow path first end 11 being connected to the compressor inlet 42; and a fourth connection, the third flow path first end 31 being connected to the compressor outlet 41 and the second flow path first end 21 being connected to the compressor inlet 42. It should be understood that although switching assembly 90 is described in the following embodiments as being capable of switching between four connection modes, in some embodiments, switching assembly 90 may only be capable of implementing any two or three of the connection modes described above. In some embodiments, switching assembly 90 may be comprised of first and second four- way valves 91, 92 and several lines, the specific manner of operation of which will be described in detail below in connection with the modes of operation.
The heat pump system further includes a control system for controlling the switching assembly 90 and the first throttling device 13, the second throttling device 23 and optionally other valves and throttling devices in the heat pump system to achieve various functions, including operating the heat pump system in a cooling mode, a heating mode, a hot water heating mode and a cooling heat recovery mode, or in three or four modes. Similarly, although the following describes a heat pump system having four modes, in other embodiments, the heat pump system may have only any two or three of the above modes.
As shown in fig. 1, in which the heat pump system is in the cooling mode, the switching assembly 90 is in the first connection mode, that is, the first four-way valve 91 is in the first position and the second four-way valve 92 is in the first position, at this time, the first throttling device 13 performs the throttling function, and the second throttling device 23 is fully opened. Specifically, in this cooling mode (refrigeration cycle), the refrigerant leaving the compressor outlet 41 enters from the a-port and leaves the first four-way valve 91 from the d-port, and enters from the e-port and leaves the second four-way valve 92 from the f-port, thereby passing through the first flow path 100 in a first flow direction, specifically, through the first heat exchanger 12 and the first throttling device 13, this first throttling device 13 may be, for example, a thermostatic expansion valve or an electronic expansion valve, which functions as a throttling function, i.e., refrigerant superheat degree control, and the refrigerant after passing through the accumulator 5 flows through the second flow path in a second flow direction, including the second throttling device 23 in a fully open state, the second heat exchanger 22, and finally the refrigerant enters through the h-port and leaves the second four-way valve 92 from the g-port, passes through the separator 6, enters the compressor inlet 42, and is compressed by the compressor 4. It should be noted that in the embodiment of the invention, in the cooling mode, the accumulators 5 are both located downstream of the throttling means 13, i.e. in the low pressure region. Therefore, the refrigerant stored in the accumulator 5 is in a low-pressure state, and the deterioration of the system performance due to the high-pressure refrigerant being stored in the accumulator 5 is avoided.
With continued reference to fig. 2, in which the heat pump system is in the heating mode, the switching assembly 90 is in the second connection mode, i.e., the first four-way valve 91 is in the first position and the second four-way valve 92 is in the second position, at which time the first throttling unit 13 functions as a throttling function and the second throttling unit 23 is bypassed, specifically, bypassed by the second check valve 26 connected in parallel therewith. Specifically, in this heating mode (heating cycle), the refrigerant leaving the compressor outlet 41 enters from the a-port and leaves the first four-way valve 91 from the d-port, and enters from the e-port and leaves the second four-way valve 92 from the h-port, thereby passing through the second flow path 200 in the first flow direction, specifically, passing through the second heat exchanger 22 and bypassing the second throttling device 23, that is, bypassing the second throttling device 23 through the second check valve 26 in parallel with the second throttling device 23 (the second throttling device 23 itself is in a closed state), the second check valve 26 allowing only the fluid flowing toward the second flow path second end 24 to pass therethrough. The refrigerant then passes through the accumulator 5 and then in a second flow direction through the first flow path 100, including the first throttling means 13, which again functions as a throttling, the refrigerant then passes through the first heat exchanger 12, finally enters through the f-port and exits the second four-way valve 92 from the g-port, passes through the separator 6, enters the compressor inlet 42 and is compressed by the compressor 4. In this embodiment, the second throttle 23 may be bypassed by a second check valve 26 in parallel with the second throttle 23, the second check valve 26 having a lower flow resistance for the high pressure fluid.
With continued reference to fig. 3, in the heat pump system in the hot water heating mode, the switching assembly 90 is in the third connection mode, that is, the first four-way valve 91 is in the second position and the second four-way valve 92 is in the second position, at this time, the first throttling unit 13 performs the throttling function, and the second throttling unit 23 is in the closed state. Specifically, in the heating water mode (heating water cycle), the refrigerant leaving the compressor outlet 41 enters from the a-port and leaves the first four-way valve 91 from the b-port, thereby passing through the third flow path 300 in the first flow direction, specifically, through the third heat exchanger 32 and through the second one-way valve 33, then passes through the accumulator 5 and then passes through the first flow path 100 in the second flow direction, including the first throttling device 13, which again functions as a throttling, and the refrigerant then passes through the first heat exchanger 12, finally enters through the f-port and leaves the second four-way valve 92 from the g-port, then passes through the separator 6, enters the compressor inlet 42 and is compressed by the compressor 4. In the heating water mode, the third heat exchanger 32 supplies heat to the water, thereby generating heating water.
With continued reference to fig. 4, in which the heat pump system is in a cooling and heat recovery mode, the switching assembly 90 is in a fourth connection mode, in which the first four-way valve 91 is in the second position and the second four-way valve 92 is in the first position, in which the second throttling unit 23 is throttling and the first throttling unit 13 is in a closed state. Specifically, in this cooling-heat recovery mode (cooling-heat recovery cycle), the refrigerant leaving the compressor outlet 41 enters from the a-port and leaves the first four-way valve 91 from the b-port, thereby passing through the third flow path 300 in the first flow direction, specifically, through the third heat exchanger 32 and through the first check valve 33, and then the refrigerant passes through the second flow path 200 in the second flow direction (without passing through the accumulator 5), including the second throttle device 23 (the second check valve 26 does not allow the passage of the fluid in the second flow direction), in this cycle, the second throttle device 23 functions as a throttle, that is, the second throttle device 23 may be a thermal expansion valve or an electronic expansion valve, which functions as a superheat degree control. The refrigerant then passes through the second heat exchanger 22, finally enters through the h-port and exits the second four-way valve 92 from the g-port, then passes through the separator 6, enters the compressor inlet 42 and is compressed by the compressor 4. In the heating and cooling heat recovery mode, the second heat exchanger 22 cools, and the third heat exchanger 32 recovers heat energy to supply water, thereby generating hot water.
Therefore, in the embodiment according to the present invention, the free switching of the above four modes can be realized by using only two throttling devices.
With continued reference to fig. 5, the difference compared to the embodiment of fig. 1 to 4 is that the reservoir 5 has only one line 51, which is common to both the inlet and outlet lines. In such an embodiment, the first flow path second end 14, the second flow path second end 24 and the third flow path second end 34 are directly connected, and the line 51 of the reservoir 5 may be connected to the first flow path, the second flow path or the third flow path at or near the connection point of the first flow path second end 14, the second flow path second end 24 and the third flow path second end 34, for example, on the first flow path, a location between the first throttling means 13 and the first flow path second end 14, or on the second flow path, on the main path between the second throttling means 23 and the second flow path second end 24, or on the third flow path, between the first check valve 33 and the third flow path second end 34. The heat pump system according to the embodiment shown in fig. 5 can also be operated in various modes, which are not described in detail here.
With continued reference to fig. 6-9, another embodiment according to the present invention will be described. In this embodiment, the difference from the embodiment of fig. 1 to 4 is that: the first and second flow path second ends 14 and 24 are connected to a first pipe 52 of the reservoir 5, and the third flow path second end 34 is connected to a second pipe 53 of the reservoir 5. In addition, a solenoid valve 27 and a second check valve 26 are provided which are connected between a position between the second heat exchanger 22 and the second throttle device 23 on the second flow path and the second pipe 53 (or the second end 34 of the third flow path) of the accumulator 5, the solenoid valve 27 and the second check valve 26 are connected in parallel, and the second check valve 26 allows only the passage of the fluid to the second pipe 53 of the accumulator 5 (i.e., the second flow direction).
In this embodiment, in the cooling mode shown in fig. 6, the refrigerant leaving the compressor outlet 41 passes through the switching assembly 90 in the first flow direction through the first flow path 100, while also the first throttling device 13 is throttling, the second throttling device 23 is closed and the solenoid valve 27 is open, and after passing through the accumulator 5, the refrigerant bypasses the second throttling device 23 through the solenoid valve 27, enters the second heat exchanger 22, and passes through the switching assembly 90 back to the compressor inlet 42.
In the heating mode shown in fig. 7, the refrigerant leaving the compressor outlet 41 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, and the high-pressure refrigerant passes through the second check valve 26 with a smaller pressure drop and flows through the first flow path 100 in the second flow direction after passing through the accumulator 5, wherein the first throttling device 13 throttles and the refrigerant returns to the compressor inlet 42 through the switching assembly 90.
In the hot water mode shown in fig. 8, the refrigerant leaving the compressor outlet 41 enters the third flow path 300 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, and after passing through the accumulator 5, the refrigerant flows through the first flow path 100 in the second flow direction, wherein the first throttling device 13 throttles and the refrigerant returns to the compressor inlet 42 through the switching assembly 90.
In the cooling and heat recovery mode shown in fig. 9, the refrigerant leaving the compressor outlet 41 enters the third flow path 300 through the switching assembly 90 in the first flow direction, the first throttling device 13 is closed and the solenoid valve 27 is in the closed state, and after passing through the accumulator 5, the refrigerant flows through the second flow path 200 in the second flow direction, wherein the second throttling device 23 throttles and the refrigerant returns to the compressor inlet 42 through the switching assembly 90.
By the arrangement of fig. 6 to 9, better performance in the cooling mode can be obtained by bypassing the second throttle 23 with a solenoid valve. It should be appreciated that a solenoid valve in parallel with second restriction 23 may also be employed in the embodiment of fig. 1-5 to bypass second restriction 23 in the cooling mode to improve system performance. In addition, the arrangement of fig. 6 to 9 enables the dual-line accumulator to function also in the heating and heat recovery mode, i.e. the dual-line accumulator 5 functions to regulate the amount of refrigerant in the system in each of the four modes.
With continued reference to fig. 10, it differs from the embodiment of fig. 6-9 in that compressor 4 is a gas injection enthalpy increasing compressor, which further includes a gas injection enthalpy increasing port 43. The heat pump system further comprises an economizer 8, the first flow path 100 comprising a branch point P and a first line 81 passing through the economizer 8, wherein in the heating mode and the heating water mode, refrigerant flowing from the first flow path second end 14 to the first flow path first end 11 passes through the economizer first line 81 before passing through the first throttling means 13 and is split at the branch point P into a first portion leading to the first throttling means 13 and a second portion leading to the bypass, the second portion of refrigerant passes through an optional filter 85 and a bypass throttling means 84 on the bypass and the economizer 8 second line 82 to exchange heat in the economizer 8 with refrigerant in the first line 81 of the economizer 8, and refrigerant passing through the economizer 8 second line 82 is provided to the compressor enthalpy gain 43. The performance of the system can be further improved by the combination of the economizer and the enhanced vapor injection compressor. It should be understood that the economizer and enhanced vapor injection compressor combination of fig. 10 is equally applicable to other embodiments of the present invention.
In the embodiment of the invention, the switching between the four modes can be realized only by adopting two groups of throttling devices, so that the cost of more throttling devices or control valves is saved. In some embodiments, no throttling means are included on the third flow path, and only both the first and second throttling means 13, 23 described above are present on the three flow paths. In addition, in an embodiment according to the invention, in the cooling mode, the accumulator is located in a low pressure region downstream of the throttling device, thereby improving the performance of the heat pump system in the cooling mode.
The heat pump system comprises a refrigeration working condition, and under the refrigeration working condition, the heat pump system is switched among a refrigeration mode, a hot water heating mode and a refrigeration heat recovery mode. For example, when there is a cooling demand, the mode is switched to the cooling mode, when there is a heating demand, the mode is switched to the heating mode, and when there are both cooling and heating demands, the cooling heat recovery mode is performed.
The heat pump system further includes a heating condition under which the heat pump system switches between a heating mode and a hot water mode, for example, to the heating mode when heating is required and to the hot water mode when hot water is required. In addition, in the heating condition, the heat pump system can defrost the first heat exchanger 12 by switching to the first connection mode and fully opening the first throttle device.
In another aspect, a method for controlling a heat pump system is also provided, the method including: operating the heat pump system in two, three or four of a refrigeration mode, a heating mode, a hot water heating mode and a refrigeration heat recovery mode;
in the cooling mode, 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 throttling the first throttling unit to fully open or bypass the second throttling unit;
in the heating mode, connecting the first end of the second flow path to the compressor outlet, connecting the first end of the first flow path to the compressor inlet, and throttling the first throttling unit to bypass the second throttling unit;
in the hot water making mode, connecting the first end of the third flow path to the outlet of the compressor, connecting the first end of the first flow path to the inlet of the compressor, throttling the first throttling unit, and closing the second throttling unit; and
in the cooling and 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 unit is throttled, and the first throttling unit is closed.
The foregoing description of the specific embodiments has been presented only to illustrate the principles of the invention more clearly, and in which various features are shown or described in detail to facilitate an understanding of the principles of the invention. Various modifications or changes to the invention will be readily apparent to those skilled in the art without departing from the scope of the invention. It is to be understood that such modifications and variations are intended to be included within the scope of the present invention.
Claims (13)
1. A heat pump system, comprising:
a compressor;
a first flow path comprising, in order: a first flow path first end, a first heat exchanger, a first throttling device and a first flow path second end;
a second flow path comprising, in order: a second flow path first end, a second heat exchanger, a second throttling device and a second flow path second end;
a third flow path comprising, in order: the first check valve on the third flow path only allows fluid flowing towards the direction of the second end of the third flow path to pass through;
wherein the first flow path second end, the second flow path second end and the third flow path second end are connected;
a switching component that can switch between any two, three or four of the following connections:
a first connection, the first flow path first end connected to the compressor outlet and the second flow path first end connected to the compressor inlet;
a second connection, the second flow path first end connected to the compressor outlet and the first flow path first end connected to the compressor inlet;
a third connection, the third flow path first end connected to the compressor outlet and the first flow path first end connected to the compressor inlet;
a fourth connection, the third flow path first end connected to the compressor outlet and the second flow path first end connected to the compressor inlet; and
a control system which can make the heat pump system run in any two, three or four of a refrigeration mode, a heating mode, a hot water heating mode and a refrigeration heat recovery mode;
in the refrigeration mode, the switching component is switched to a first connection mode, the first throttling unit plays a throttling role, and the second throttling unit is fully opened or bypassed;
in the heating mode, the switching component is switched to a second connection mode, the first throttling unit plays a throttling role, and the second throttling unit is bypassed;
in the hot water making mode, the switching assembly is switched to a third connection mode, the first throttling unit plays a throttling role, and the second throttling unit is in a closed state;
in the cooling heat recovery mode, the switching component is switched to a fourth connection mode, the second throttling unit plays a throttling role, and the first throttling unit is in a closed state.
2. The heat pump system of claim 1, wherein the second flow path includes a second one-way valve in parallel with the second flow restriction, the second one-way valve permitting passage of only fluid flowing toward the second end of the second flow path.
3. The heat pump system of claim 1, wherein the second flow path includes a solenoid valve in parallel with the second flow restriction, the heat pump system in the cooling mode having the solenoid valve open and the second flow restriction closed to bypass the second flow restriction.
4. The heat pump system of any of claims 1-3, further comprising an accumulator comprising a single line connected to the first flow path second end, the second flow path second end, and the third flow path second end at or near their connection locations.
5. The heat pump system of claim 1, further comprising an accumulator including a first line and a second line, the first and second flow path second ends connected to the first line of the accumulator, the third flow path second end connected to the second line of the accumulator.
6. The heat pump system of claim 5, further comprising a solenoid valve connected between a location on the second flow path between the second heat exchanger and the second throttling device and the second line of the accumulator.
7. The heat pump system of claim 5 or 6, further comprising a second check valve connected between a location on the second flow path between the second heat exchanger and the second throttling device and the second line of the accumulator and allowing passage of fluid only in the direction of the second end of the second line.
8. The heat pump system of claim 1, wherein the heat pump system includes a cooling condition in which the heat pump system is switched between a cooling mode, a hot water mode, and a cooling heat recovery mode; and/or
The heat pump system comprises a heating working condition, and under the heating working condition, the heat pump system is switched between a heating mode and a hot water heating mode, wherein the heat pump system is switched to the first connection mode, and the first throttling device is fully opened to defrost.
9. The heat pump system of claim 1, wherein the compressor is a vapor injection enthalpy compressor, the heat pump system further includes an economizer, the first flow path including a branch point and a first line passing through the economizer, wherein in the heating mode and the heating water mode, the refrigerant flowing from the first flow path second end to the first flow path first end passes through the first pipe line of the economizer before passing through the first throttling device, and is divided at a branch point into a first part leading to said first throttle means and a second part leading to the branch, a second portion of the refrigerant passes through a branch throttling device on the branch line and the second line of the economizer to exchange heat with the refrigerant in the first line of the economizer, and the refrigerant passing through the second line of the economizer is provided to a vapor injection enthalpy addition port of the compressor.
10. The heat pump system of claim 1, wherein the third flow path is free of a throttling device.
11. The heat pump system of claim 1, wherein the switching assembly comprises two four-way valves.
12. A method for controlling a heat pump system, comprising,
the heat pump system includes:
a compressor;
a first flow path comprising, in order: a first flow path first end, a first heat exchanger, a first throttling device and a first flow path second end;
a second flow path comprising, in order: a second flow path first end, a second heat exchanger, a second throttling device and a second flow path second end;
a third flow path comprising, in order: the first check valve on the third flow path only allows fluid to flow towards the direction of the second end of the third flow path;
wherein the first flow path second end, the second flow path second end and the third flow path second end are connected;
characterized in that the method comprises: the heat pump system is operated in any two, three or four of a refrigeration mode, a heating mode, a hot water heating mode and a refrigeration heat recovery mode;
in the cooling mode, 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 throttling the first throttling unit to make the second throttling unit fully open or bypassed;
in the heating mode, connecting the first end of the second flow path to the compressor outlet, connecting the first end of the first flow path to the compressor inlet, and throttling the first throttling unit and bypassing the second throttling unit;
in the hot water making mode, connecting the first end of the third flow path to the outlet of the compressor, connecting the first end of the first flow path to the inlet of the compressor, throttling the first throttling unit, and closing the second throttling unit; and
in the cooling and 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 unit is throttled, and the first throttling unit is closed.
13. The method of claim 12, wherein the method comprises:
the heat pump system is operated under a refrigeration working condition, wherein the heat pump system is switched among a refrigeration mode, a hot water heating mode and a refrigeration heat recovery mode; and/or
Operating the heat pump system in a heating condition, wherein the heat pump system is switched between a heating mode and a hot water mode;
the method further comprises the following steps: and under 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 defrost.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010758274.2A CN114061168A (en) | 2020-07-31 | 2020-07-31 | Heat pump system and control method thereof |
| EP20215663.4A EP3945267A1 (en) | 2020-07-31 | 2020-12-18 | Heat pump system and control method thereof |
| US17/133,769 US20220034565A1 (en) | 2020-07-31 | 2020-12-24 | Heat pump system and control method thereof |
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 |
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| CN114061168A true CN114061168A (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010758274.2A Pending CN114061168A (en) | 2020-07-31 | 2020-07-31 | Heat pump system and control method thereof |
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| US (1) | US20220034565A1 (en) |
| EP (1) | EP3945267A1 (en) |
| CN (1) | CN114061168A (en) |
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|---|---|---|---|---|
| EP4187176A1 (en) | 2020-06-30 | 2023-05-31 | 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 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7299649B2 (en) * | 2003-12-09 | 2007-11-27 | Emerson Climate Technologies, Inc. | Vapor injection system |
| US20130167559A1 (en) * | 2012-01-02 | 2013-07-04 | Samsung Electronics Co., Ltd. | Heat pump and control method thereof |
| CN104374115A (en) * | 2013-08-14 | 2015-02-25 | 开利公司 | Heat pump system, heat pump unit and a multifunctional mode control method for heat pump system |
| CN105823267B (en) * | 2015-01-08 | 2020-06-05 | 开利公司 | Heat pump system and adjusting method thereof |
| WO2017138107A1 (en) * | 2016-02-10 | 2017-08-17 | 三菱電機株式会社 | Refrigeration cycle device |
| KR101787075B1 (en) * | 2016-12-29 | 2017-11-15 | 이래오토모티브시스템 주식회사 | Heat Pump For a Vehicle |
| CN108870803A (en) * | 2017-05-12 | 2018-11-23 | 开利公司 | Heat pump system and its control method |
| CA3134702C (en) * | 2019-03-29 | 2024-03-19 | Daikin Industries, Ltd. | 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
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| US20220034565A1 (en) | 2022-02-03 |
| EP3945267A1 (en) | 2022-02-02 |
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