CN115127196A - Heat storage defrosting control system, control method and air conditioner - Google Patents
Heat storage defrosting control system, control method and air conditioner Download PDFInfo
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- CN115127196A CN115127196A CN202210900782.9A CN202210900782A CN115127196A CN 115127196 A CN115127196 A CN 115127196A CN 202210900782 A CN202210900782 A CN 202210900782A CN 115127196 A CN115127196 A CN 115127196A
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- 238000005338 heat storage Methods 0.000 title claims abstract description 130
- 238000010257 thawing Methods 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- 239000003507 refrigerant Substances 0.000 claims description 91
- 230000004087 circulation Effects 0.000 claims description 42
- 238000005057 refrigeration Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 claims description 3
- 238000004781 supercooling Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 15
- 230000005494 condensation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a heat storage defrosting control system, a control method and an air conditioner, wherein the heat storage defrosting control system comprises: the defrosting control valve is connected with the four-way valve, the first throttling valve is connected with the heat storage module in series to form a first middle branch, and the first middle branch is connected with an air suction port of the compressor. The first end of the indoor heat exchanger group is connected with the main throttle valve, the second end of the indoor heat exchanger group is respectively connected with the four-way valve and the fourth throttle valve, the fourth throttle valve is connected with the heat storage module in series to form a second middle branch, and the second middle branch is connected with the first end of the outdoor heat exchanger. The four-way valve can also realize defrosting of the outdoor heat exchanger without reversing in the heating state, and has small indoor temperature fluctuation and good comfort.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a heat storage defrosting control system, a heat storage defrosting control method and an air conditioner.
Background
With the development of science and technology and the continuous improvement of living standard, air conditioners become indispensable electrical equipment in modern life, the air conditioners on the market are various at present, taking common heat pump type air conditioners as an example, when low-temperature heating operation is carried out, frost layers can be formed on the surfaces of outdoor heat exchangers, and in order not to influence the heating effect, various schemes capable of continuously heating have appeared in the prior art.
For example, a multi-online hot water system for defrosting without shutdown and a control method thereof are provided, wherein a phase change heat storage module is arranged in a refrigerant circulation loop, and the heat storage module is used for storing heat which is released during defrosting so as to keep the heating state of an indoor unit unchanged.
For another example, an air conditioner and a defrosting control method of the air conditioner are characterized in that a heat storage heating module is arranged in a refrigerant circulation loop, a heat accumulator is in an arc shape and is attached to the surface of a compressor to absorb waste heat of the compressor, an auxiliary electric heater is additionally arranged in the heat accumulator, heat is provided for the heat accumulator through the auxiliary electric heater, and therefore sufficient heat during heat storage and defrosting is guaranteed.
Therefore, how to design a heat storage defrosting control system with a four-way valve not reversing and being more stable and safe in defrosting is an urgent technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a heat storage defrosting control system, a control method and an air conditioner, wherein a four-way valve of the system keeps a heating state and can also defrost an outdoor heat exchanger without reversing, the indoor environment temperature fluctuation is small, the comfort is good, a heat storage module can be connected into a refrigerant circulation loop to participate in refrigerant circulation, the heat flowing through the refrigerant is absorbed to realize heat storage, and the whole system is stable and safe and can adapt to continuous work in different external environments.
The invention adopts the technical scheme that a heat storage defrosting control system is designed, and comprises the following components: the defrosting control valve is connected with the four-way valve, the first throttling valve is connected with the heat storage module in series to form a first middle branch, and the first middle branch is connected with an air suction port of the compressor.
Preferably, when the refrigerant circulation circuit is in a heating cycle, the first middle branch can be connected as a defrosting and heat releasing branch, the main throttle valve is fully opened, the defrosting control valve is closed, and the first throttle valve is opened to throttle the refrigerant flowing through.
Preferably, when the refrigerant circulation loop is in a refrigeration cycle, the first intermediate branch can be connected as a refrigeration heat storage branch, and the first throttle valve is opened to allow part of the refrigerant flowing out of the defrosting control valve to enter the heat storage module.
Preferably, the first end of the indoor heat exchanger group is connected with the main throttle valve, the second end of the indoor heat exchanger group is respectively connected with the four-way valve and the fourth throttle valve, the fourth throttle valve is connected with the heat storage module in series to form a second middle branch, the second middle branch is connected with the first end of the outdoor heat exchanger, and at most one of the first middle branch and the second middle branch is communicated.
Preferably, when the refrigerant circulation loop is in a heating cycle, the second intermediate branch can be connected as a heating heat storage branch, and the fourth throttle valve is opened to allow part of refrigerant flowing out of the four-way valve to enter the heat storage module.
Preferably, the first intermediate branch is further provided with a third control valve for controlling the on-off state of the first intermediate branch, and the heat storage module is connected in series between the first throttle valve and the third control valve.
Preferably, the second intermediate branch is further provided with a second control valve for controlling the on-off state of the second intermediate branch, and the heat storage module is connected between the second control valve and the fourth throttle valve in series.
Preferably, a subcooler is connected in series between the indoor heat exchanger group and the main throttle valve, the subcooler is provided with a main heat exchange tube and an auxiliary heat exchange tube, the first end of the main heat exchange tube is connected with the indoor heat exchanger group, the second end of the main heat exchange tube is connected with the main throttle valve, the first end of the auxiliary heat exchange tube is connected with the subcooling throttle valve in series and is connected with the second end of the main heat exchange tube, and the second end of the auxiliary heat exchange tube is connected with the air suction port of the compressor.
Preferably, a gas-liquid separator is connected to the suction port of the compressor, and all the refrigerant sent to the suction port of the compressor passes through the gas-liquid separator.
The invention also provides a heat storage defrosting control method, which is used for controlling the running state of the heat storage defrosting control system, and the heat storage defrosting control method comprises the following steps: and acquiring a working mode of the heat storage defrosting control system, and controlling the opening degrees of the first middle branch, the second middle branch and the valve members in the refrigerant circulation loop according to the working mode.
Preferably, the heat storage and defrosting control system has at least one of a cooling mode, a cooling and heat storage mode, a heating and heat storage mode, and a heating and defrosting mode, and the controlling of the opening degrees of the first intermediate branch, the second intermediate branch, and the valve elements in the refrigerant circulation circuit according to the operation mode includes:
when the heat storage defrosting control system is in a heating defrosting mode, the main throttle valve is fully opened, the defrosting control valve is closed, and the first throttle valve is opened to throttle the flowing refrigerant;
and/or when the heat storage and defrosting control system is in a refrigeration and heat storage mode, opening the main throttle valve and the defrosting control valve, and opening the first throttle valve to allow part of refrigerant flowing out of the defrosting control valve to enter the heat storage module;
and/or when the heat storage defrosting control system is in a refrigerating mode, opening the main throttle valve and the defrosting control valve, and closing the first middle branch and the second middle branch;
and/or when the heat storage defrosting control system is in a heating mode, opening the main throttle valve and the defrosting control valve, and closing the first middle branch and the second middle branch;
and/or when the heat storage and defrosting control system is in a heating and heat storage mode, the main throttle valve and the defrosting control valve are opened, and the fourth throttle valve is opened to allow part of the refrigerant flowing out of the four-way valve to enter the heat storage module.
The invention also provides an air conditioner which adopts the heat storage defrosting control system.
The invention also provides an air conditioner, and a processor of the air conditioner executes the heat storage defrosting control method.
Compared with the prior art, the invention is provided with the first middle branch connected with the outdoor heat exchanger, the first middle branch is formed by the first throttle valve and the heat storage module which are connected in series, the first middle branch has different functions under different circulation states of the refrigerant circulation loop, heat release and heat storage are flexibly realized, the four-way valve can also realize defrosting of the outdoor heat exchanger without reversing when the heating state is kept by the four-way valve, the use is comfortable, and the system is safe and stable. In addition, the invention is also provided with a second middle branch connected with the indoor heat exchanger group, when the refrigerant circulation loop is in heating circulation, the second middle branch can be communicated to be used as a heating heat storage branch, and the heat storage module can be more flexibly connected into the refrigerant circulation loop to participate in refrigerant circulation and absorb heat flowing through the refrigerant to realize heat storage.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic diagram of a control system according to one embodiment of the present invention;
fig. 2 is a schematic diagram of a control system according to another embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present patent and are not limiting upon the present patent.
As shown in fig. 1, the heat storage defrosting control system provided by the present invention is suitable for an air conditioner, especially an air conditioner with a cooling and heating function, the heat storage defrosting control system mainly comprises two parts, which are a refrigerant circulation loop and a heat storage module, a compressor 1, a four-way valve 2, an indoor heat exchanger group 3, a main throttle valve 4 and an outdoor heat exchanger 5 are sequentially connected through a pipeline to form a refrigerant circulation loop, the indoor heat exchanger group 3 comprises at least one indoor heat exchanger, one end of the indoor heat exchanger group 3 is provided with a first valve 6, the other end is provided with a second valve 6, and when the first valve 6 and the second valve 7 are closed, the whole indoor heat exchanger group 3 does not participate in refrigerant circulation. When the indoor heat exchanger group 3 includes more than two indoor heat exchangers arranged in parallel, an indoor control valve 8 for controlling the on-off state of the indoor heat exchangers is installed at one end of each indoor heat exchanger, namely, the number of the indoor heat exchangers participating in refrigerant circulation can be adjusted by the switch of the indoor control valve 8.
The heat storage module 9 is connected with the outdoor heat exchanger 5 through a first middle branch, the first end of the outdoor heat exchanger 5 is connected with the main throttle valve 4, the second end of the outdoor heat exchanger 5 is respectively connected with the defrosting control valve 10 and the first throttle valve 11, the defrosting control valve 10 is connected with the four-way valve 2, the first throttle valve 11 is connected with the heat storage module 9 in series to form a first middle branch, the first middle branch is connected with the air suction port of the compressor 1, and different functions can be realized when the refrigerant circulation loop is in different circulations.
When the refrigerant circulation loop is in a heating cycle, the first middle branch can be connected to serve as a defrosting and heat releasing branch, the main throttle valve 4 is fully opened, the defrosting control valve 10 is closed, and the first throttle valve 11 is opened to throttle the refrigerant flowing through. Under the condition, the refrigerant flowing out of the indoor heat exchanger group 3 directly enters the outdoor heat exchanger 5 without throttling, the outdoor heat exchanger 5 is defrosted by utilizing the residual heat of the refrigerant, the refrigerant flowing out of the defrosting enters the heat storage module 9 under the throttling action of the first throttling valve 11, the refrigerant absorbs heat and evaporates by utilizing the heat of the heat storage module 9 and is sent to the air suction port of the compressor 1, the heat storage module 9 replaces the outdoor heat exchanger 5 to be used as an evaporator in the process, the four-way valve 2 can defrost the outdoor heat exchanger 5 without reversing the heating state, the indoor environment temperature fluctuation is small, the comfort is good, and the noise caused by reversing the four-way valve 2 in defrosting can be avoided.
When the refrigerant circulation loop is in a refrigeration cycle, the first intermediate branch can be connected as a refrigeration and heat storage branch, and the first throttle valve 11 is opened to allow part of the refrigerant flowing out of the defrosting control valve 10 to enter the heat storage module 9. Under the condition, a high-temperature refrigerant discharged by the compressor 1 flows to the defrosting control valve 10 through the four-way valve 2, a part of the refrigerant flowing out of the defrosting control valve 10 enters the outdoor heat exchanger 5 to perform normal refrigeration cycle, the other part of the refrigerant flowing out of the defrosting control valve 10 enters the heat storage module 9 through the first throttling valve 11, the medium in the heat storage module 9 absorbs the heat of the refrigerant, the flowing out refrigerant is sent to the air suction port of the compressor 1, the heat storage process is stable and safe, and the normal operation of the compressor 1 and other components cannot be influenced.
In some embodiments of the present invention, the heat storage module 9 is connected to the indoor heat exchanger group 3 through a second intermediate branch, a first end of the indoor heat exchanger group 3 is connected to the main throttle 4, a second end of the indoor heat exchanger group 3 is connected to the four-way valve 2 and the fourth throttle 12, respectively, the fourth throttle 12 is connected in series with the heat storage module 9 to form a second intermediate branch, and the second intermediate branch is connected to a first end of the outdoor heat exchanger 5. When the two middle branches are connected at the same time, the refrigerant can bypass the heat storage module 9 and directly enters the refrigerant circulation loop, and the two middle branches are invalid, so that at most one of the first middle branch and the second middle branch is connected.
When the refrigerant circulation loop is in a heating cycle, the second intermediate branch can be connected as a heating heat storage branch, and the fourth throttle valve 12 is opened to allow part of the refrigerant flowing out of the four-way valve 2 to enter the heat storage module 9. Under the condition, the high-temperature refrigerant discharged by the compressor 1 respectively flows to the indoor heat exchanger group 3 and the fourth throttle valve 12 after passing through the four-way valve 2, namely, a part of the refrigerant flowing out of the four-way valve 2 enters the indoor heat exchanger group 3 to perform normal refrigeration cycle, the other part of the refrigerant flowing out of the four-way valve 2 enters the heat storage module 9 through the fourth throttle valve 12, the medium in the heat storage module 9 absorbs the heat of the refrigerant, the flowing-out refrigerant is sent to the air suction port of the compressor 1, the heat storage process is stable and safe, and the normal operation of the compressor 1 and other components cannot be influenced.
In some embodiments proposed by the present invention, the first intermediate branch is further provided with a third control valve 13 for controlling the on-off state thereof, the thermal storage module 9 is connected in series between the first throttle valve 11 and the third control valve 13, the second intermediate branch is further provided with a second control valve 14 for controlling the on-off state thereof, the thermal storage module 9 is connected in series between the second control valve 14 and the fourth throttle valve 12, the first throttle valve 11 and the second control valve 14 are connected in parallel at one end of the thermal storage module 9, and the third control valve 13 and the fourth throttle valve 12 are connected in parallel at the other end of the thermal storage module, as viewed in connection. The third control valve 13 and the second control valve 14 both function to prevent the heat storage module 9 from affecting the normal operation of the refrigerant circulation circuit, and when the first throttle valve 11 and the third control valve 13 are closed, the first intermediate branch can be completely cut off from the refrigerant circulation circuit, and when the second control valve 14 and the fourth throttle valve 12 are closed, the second intermediate branch can be completely cut off from the refrigerant circulation circuit. The main throttle 4, the first throttle 11, the fourth throttle 12, and the like may be electronic expansion valves, and the second control valve 14 and the third control valve 13 may be stop valves or electromagnetic valves, which may implement a function of opening and closing a refrigerant flow path.
It should be understood that the outdoor heat exchanger 5, the indoor heat exchanger, and the heat storage module 9 each have a first end and a second end for the refrigerant to enter and exit, and the first end and the second end are taken as an example on the same device, and when the first end is taken as a refrigerant inlet end, the second end is taken as a refrigerant outlet end, and when the first end is taken as a refrigerant outlet end, the second end is taken as a refrigerant inlet end.
As shown in fig. 2, in some embodiments of the present invention, a subcooler 15 is connected in series between the indoor heat exchanger group 3 and the main throttle valve 4, and the subcooler 15 plays a role of secondary condensation, so as to improve the subcooling degree of the system, and is particularly suitable for a system in which a connecting pipeline between the indoor heat exchanger group 3 and the outdoor heat exchanger 5 is relatively long. Specifically, the subcooler 15 has a main heat exchange tube and an auxiliary heat exchange tube, a first end of the main heat exchange tube is connected with the indoor heat exchanger group 3, a second end of the main heat exchange tube is connected with the main throttle valve 4, a first end of the auxiliary heat exchange tube is connected with the subcooling throttle valve 16 in series and is connected with a second end of the main heat exchange tube, and a second end of the auxiliary heat exchange tube is connected with the air suction port of the compressor 1.
In some embodiments, the air suction port of the compressor 1 is connected with a gas-liquid separator 17, all the refrigerant sent to the air suction port of the compressor 1 passes through the gas-liquid separator 17, the air discharge port of the compressor 1 is connected with an oil separator 18, the refrigerant sent out from the air discharge port of the compressor 1 passes through the oil separator 18 and then flows to the four-way valve 2, an oil return port of the oil separator 18 is connected to the air suction port of the compressor 1 through an oil return branch, an oil return capillary tube is connected in series to the oil return branch, and the lubricating oil in the oil separator 18 is sent back to the compressor 1 through the oil return branch. The liquid refrigerant and the gaseous refrigerant are separated by the gas-liquid separator 17, and the lubricating oil carried in the gaseous refrigerant is separated by the oil separator 18, so that the system can continuously and stably operate.
The invention also provides a control method of the heat storage defrosting control system, the heat storage defrosting control system has at least one of a refrigeration mode, a refrigeration and heat storage mode, a heating and heat storage mode and a heating defrosting mode, and the control method comprises the following steps: and acquiring a working mode of the heat storage defrosting control system, and controlling the opening degrees of the valves in the first intermediate branch, the second intermediate branch and the refrigerant circulation loop according to the working mode.
The states of the valve elements in the different modes are explained in detail below, as shown in fig. 2.
When the heat storage defrosting control system is in a cooling mode, the main throttle valve 4 and the defrosting control valve 10 are opened, the first middle branch and the second middle branch are closed, in this case, the defrosting control valve 10 is fully opened, the first throttle valve 11, the second control valve 14, the third control valve 13 and the fourth throttle valve 12 are closed, and the four-way valve 2 is in a power-off state. The refrigeration cycle flow path is high-temperature and high-pressure gas at the discharge port of the compressor 1 → the oil separator 18 → the four-way valve 2 → the condensation of the outdoor heat exchanger 5 → the main throttle valve 4 → the subcooler 15 → the throttling of the indoor control valve 8 → the evaporation of the indoor heat exchanger group 3 → the four-way valve 2 → the gas-liquid separator 17 → the return to the suction port of the compressor 1. During refrigeration, the liquid refrigerant condensed in the outdoor heat exchanger 5 can be throttled by the supercooling throttle valve 16, and then is evaporated and absorbed in the subcooler 15 to absorb the refrigerant heat of the main heat exchange tube so as to achieve a supercooled state.
When the heat storage and defrosting control system is in a heating mode, the main throttle valve 4 and the defrosting control valve 10 are opened, the first middle branch and the second middle branch are closed, in this case, the defrosting control valve 10 is kept opened, the first throttle valve 11, the second control valve 14, the third control valve 13 and the fourth throttle valve 12 are closed, and the four-way valve 2 is in a power-on state. The heating cycle flow path is high-temperature and high-pressure gas at the discharge port of the compressor 1 → the oil separator 18 → the four-way valve 2 → the indoor heat exchanger group 3 condensing → the subcooler 15 → the main throttle valve 4 → the outdoor heat exchanger 5 evaporating → the four-way valve 2 → the gas-liquid separator 17 → returning to the suction port of the compressor 1.
When the heat storage and defrosting control system is in a cooling and heat storage mode, the main throttle valve 4 and the defrosting control valve 10 are opened, the first throttle valve 11 is opened to allow part of refrigerant flowing out of the defrosting control valve 10 to enter the heat storage module 9, in this case, the defrosting control valve 10 is kept opened, the first throttle valve 11 is opened, the third control valve 13 is opened, the second control valve 14 and the fourth throttle valve 12 are closed, and the four-way valve 2 is in a power-off state. The refrigerant circulation circuit maintains a refrigeration cycle flow path, and the refrigerant flow path of the heat storage module 9 is the oil separator 18 → the four-way valve 2 → the first throttle valve 11 throttling → the heat storage module 9 → the third control valve 13 → the gas-liquid separator 17 → the suction port returning to the compressor 1.
When the heat storage and defrosting control system is in a heating and heat storage mode, the main throttle valve 4 and the defrosting control valve 10 are opened, the fourth throttle valve 12 is opened to allow part of refrigerant flowing out of the four-way valve 2 to enter the heat storage module 9, in this case, the defrosting control valve 10 is kept opened, the fourth throttle valve 12 is opened, the second control valve 14 is opened, the first throttle valve 11 and the third control valve 13 are closed, and the four-way valve 2 is in a power-on state. The refrigerant circulation circuit maintains a heating circulation path, and the refrigerant path of the heat storage module 9 is the oil separator 18 → the four-way valve 2 → the fourth throttle valve 12 throttling → the heat storage module 9 → the second control valve 14 → the gas-liquid separator 17 → the suction port returning to the compressor 1.
When the heat storage defrosting control system is in a heating defrosting mode, the main throttle valve 4 is fully opened, the defrosting control valve 10 is closed, the first throttle valve 11 is opened to throttle the refrigerant flowing through, in this case, the first throttle valve 11 is opened, the third throttle valve 13 is opened, the second throttle valve 14 and the fourth throttle valve 12 are closed, and the four-way valve 2 is in a power-on state. The heat storage module 9 participates in the heating circulation path of the refrigerant circulation circuit, and the high-temperature and high-pressure gas at the discharge port of the compressor 1 → the oil separator 18 → the four-way valve 2 → the indoor heat exchanger group 3 condensation → the subcooler 15 → the main throttle valve 4 → the outdoor heat exchanger 5 condensation → the first throttle valve 11 throttling → the heat storage module 9 evaporation → the third control valve 13 → the gas-liquid separator 17 → the suction port of the compressor 1.
It should be noted that the above refrigerant flow path is directed to an embodiment in which the subcooler 15 is provided in the system, and when the subcooler is not provided in the system, the subcooler 15 in the flow path may be omitted. The defrosting control valve 10 is kept open, that is, the defrosting control valve 10 is opened to a certain opening degree, the refrigerant is allowed to pass through the defrosting control valve 10, and the opening degree range does not make specific requirements. The full opening of the defrosting control valve 10 and the full opening of the main throttle valve 4 are both open to the maximum opening degree.
The heat storage module designed by the invention is connected to the refrigerant circulation loop through the first middle branch and the second middle branch, the heat storage and heat release of the heat storage module are flexibly realized by switching the on-off states of the first middle branch and the second middle branch, the defrosting of the outdoor heat exchanger can also be realized by keeping the heating state of the four-way valve from reversing, the fluctuation of the indoor environment temperature is small, the user experience is better, the whole system is safe and stable, and the heat storage module can adapt to continuous work in different external environments.
The invention also provides an air conditioner, the air conditioner adopts the heat accumulation defrosting control system, and a processor of the air conditioner executes the heat accumulation defrosting control method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (13)
1. The heat accumulation defrosting control system comprises: the system comprises a refrigerant circulation loop and a heat storage module, wherein the refrigerant circulation loop is formed by sequentially connecting a compressor, a four-way valve, an indoor heat exchanger group, a main throttle valve and an outdoor heat exchanger; the outdoor heat exchanger is characterized in that a first end of the outdoor heat exchanger is connected with the main throttle valve, a second end of the outdoor heat exchanger is respectively connected with a defrosting control valve and a first throttle valve, the defrosting control valve is connected with the four-way valve, the first throttle valve is connected with the heat storage module in series to form a first middle branch, and the first middle branch is connected with an air suction port of the compressor.
2. The heat storage defrosting control system according to claim 1, wherein the first intermediate branch is connected as a defrosting and heat releasing branch when the refrigerant circulation loop is in a heating cycle, the main throttle valve is fully opened, the defrosting control valve is closed, and the first throttle valve is opened to throttle the refrigerant flowing through.
3. The heat storage defrosting control system of claim 1 wherein the first intermediate branch is connected to serve as a refrigeration heat storage branch when the refrigerant circulation loop is in a refrigeration cycle, and the first throttle valve is opened to allow a part of the refrigerant flowing out of the defrosting control valve to enter the heat storage module.
4. The heat-storage defrosting control system according to claim 1, wherein a first end of the indoor heat exchanger group is connected to the main throttle valve, a second end of the indoor heat exchanger group is connected to the four-way valve and a fourth throttle valve, respectively, the fourth throttle valve is connected in series with the heat storage module to form a second intermediate branch, the second intermediate branch is connected to the first end of the outdoor heat exchanger, and at most one of the first intermediate branch and the second intermediate branch is connected.
5. The heat-storage defrosting control system according to claim 4, wherein the second intermediate branch is connected as a heating and heat-storage branch when the refrigerant circulation loop is in a heating cycle, and the fourth throttle valve is opened to allow a part of the refrigerant flowing out of the four-way valve to enter the heat-storage module.
6. The heat storage defrosting control system according to claim 1 wherein the first intermediate branch is further provided with a third control valve controlling an on-off state thereof, and the heat storage module is connected in series between the first throttle valve and the third control valve.
7. The heat storage defrosting control system according to claim 4 wherein the second intermediate branch is further provided with a second control valve controlling an on-off state thereof, and the heat storage module is connected in series between the second control valve and the fourth throttle valve.
8. The heat storage defrosting control system according to claim 1, wherein a subcooler is connected in series between the indoor heat exchanger group and the main throttle valve, and the subcooler is provided with a main heat exchange tube and an auxiliary heat exchange tube;
the first end of the main heat exchange tube is connected with the indoor heat exchanger group, and the second end of the main heat exchange tube is connected with the main throttle valve;
the first end of the auxiliary heat exchange tube is connected with the supercooling throttle valve in series and is connected with the second end of the main heat exchange tube, and the second end of the auxiliary heat exchange tube is connected with the air suction port of the compressor.
9. The heat-storage defrosting control system according to any one of claims 1 to 8, wherein a gas-liquid separator is connected to the suction port of the compressor, and all of the refrigerant sent to the suction port of the compressor passes through the gas-liquid separator.
10. A heat storage defrosting control method for controlling an operation state of the heat storage defrosting control system according to claim 4 or 5, characterized by comprising:
acquiring a working mode of the heat storage defrosting control system;
and controlling the opening degrees of valve elements in the first middle branch, the second middle branch and the refrigerant circulation loop according to the working mode.
11. The heat storage defrosting control method according to claim 10, wherein the heat storage defrosting control system has at least one of a cooling mode, a cooling and heat storage mode, a heating and heat storage mode, and a heating defrosting mode, and the controlling of the valve opening degrees of the first intermediate branch, the second intermediate branch, and the refrigerant circulation circuit according to the operation mode includes:
when the heat storage defrosting control system is in a heating defrosting mode, fully opening the main throttle valve, closing the defrosting control valve, and opening the first throttle valve to throttle the flowing refrigerant;
and/or when the heat storage defrosting control system is in a refrigerating and heat storage mode, the main throttle valve and the defrosting control valve are opened, and the first throttle valve is opened to allow part of refrigerant flowing out of the defrosting control valve to enter the heat storage module;
and/or when the heat storage defrosting control system is in a cooling mode, the main throttle valve and the defrosting control valve are opened, and the first middle branch and the second middle branch are closed;
and/or when the heat storage defrosting control system is in a heating mode, opening the main throttle valve and the defrosting control valve, and closing the first middle branch and the second middle branch;
and/or when the heat storage and defrosting control system is in a heating and heat storage mode, the main throttle valve and the defrosting control valve are opened, and the fourth throttle valve is opened to allow part of refrigerant flowing out of the four-way valve to enter the heat storage module.
12. An air conditioner characterized by employing the heat storage defrosting control system according to any one of claims 1 to 9.
13. An air conditioner characterized in that a processor of the air conditioner executes the heat storage defrosting control method according to claim 10 or 11.
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| CN116242049A (en) * | 2022-12-07 | 2023-06-09 | 清华大学 | Air conditioning system and control method thereof |
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| CN115127196B (en) | 2024-08-09 |
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