US20170198956A1 - Method and device for controlling refrigerant distribution of multi-split air-conditioning system - Google Patents
Method and device for controlling refrigerant distribution of multi-split air-conditioning system Download PDFInfo
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- US20170198956A1 US20170198956A1 US15/326,184 US201615326184A US2017198956A1 US 20170198956 A1 US20170198956 A1 US 20170198956A1 US 201615326184 A US201615326184 A US 201615326184A US 2017198956 A1 US2017198956 A1 US 2017198956A1
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- expansion valve
- electronic expansion
- opening
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- indoor unit
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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
- 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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F25B41/06—
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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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
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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
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
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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
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B2400/23—Separators
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2509—Economiser 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
Definitions
- the present disclosure relates to air conditioner technology field, and more particularly to a method and a device for controlling refrigerant distribution of a multi-split air-conditioning system.
- Refrigerant volume entering the cooling indoor unit and discharge superheat of the cooling indoor unit will be affected by an opening of the electronic expansion valve.
- the refrigerant volume entering the cooling indoor unit is reduced because of the inappropriate opening of the electronic expansion valve, the cooling effect of the cooling indoor unit will be affected; and when the discharge superheat is reduced because of the inappropriate opening of the electronic expansion valve, the liquid strike on a compressor will be caused and the compressor is damaged.
- the multi-split air-conditioning system includes: a re-cooling system including a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve, and a flow distributing device.
- the method includes followings: when the multi-split air-conditioning system enters a main heating mode, controlling the second electronic expansion valve to close; controlling an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment; when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches a maximum opening, calculating a target opening of the second electronic expansion valve according to a total opening and the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit; and controlling the second electronic expansion valve according to the target opening.
- a device for controlling refrigerant distribution of a multi-split air-conditioning system includes: a re-cooling system including a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve, and a flow distributing device.
- the device for controlling refrigerant distribution of a multi-split air-conditioning system includes: a first control component, configured to control the second electronic expansion valve to close when the multi-split air-conditioning system enters a main heating mode; a second control component, configured to control an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment; a calculating component, configured to calculate a target opening of the second electronic expansion valve according to a total opening and a maximum opening of the electronic expansion valve corresponding to the cooling indoor unit when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening; and a third control component, configured to control the second electronic expansion valve according to the target opening.
- a multi-split air-conditioning system includes: a re-cooling system, a flow distributing device and a controller.
- the re-cooling system includes a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve.
- the controller is configured to: when the multi-split air-conditioning system enters a main heating mode, control the second electronic expansion valve to close; control an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment; when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches a maximum opening, calculate a target opening of the second electronic expansion valve according to a total opening and the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit; and control the second electronic expansion valve according to the target opening.
- FIG. 1 is a flow chart of a method for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure.
- FIG. 2 is a schematic diagram of a multi-split air-conditioning system according to an embodiment of the present disclosure.
- FIG. 3 is a block diagram of a device for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure.
- FIG. 1 is a flow chart of a method for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure.
- the multi-split air-conditioning system includes: a re-cooling system and a flow distributing device.
- the re-cooling system includes a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve.
- the method for controlling refrigerant distribution of a multi-split air-conditioning system includes followings.
- step S 101 when the multi-split air-conditioning system enters a main heating mode, the second electronic expansion valve is controlled to close.
- step S 102 an electronic expansion valve corresponding to a cooling indoor unit is controlled to perform an opening adjustment.
- the discharge superheat of an outdoor unit may be controlled by controlling an opening of the second electronic expansion valve.
- the discharge superheat of the outdoor unit and a refrigerant volume flowing into the cooling indoor unit are controlled by controlling the opening of the second electronic expansion valve and an opening of the electronic expansion valve corresponding to the cooling indoor unit.
- the opening of the second electronic expansion valve and the opening of the electronic expansion valve corresponding to the cooling indoor unit may be calculated according to the refrigerant volume required by the cooling indoor unit for cooling.
- the electronic expansion valve corresponding to the cooling indoor unit may also play the role of the second electronic expansion valve, i.e.
- the opening of the electronic expansion valve corresponding to the cooling indoor unit may be controlled preferentially in that mode, that is, in step S 101 , before controlling the electronic expansion valve corresponding to the cooling indoor unit to perform the opening adjustment, the second electronic expansion valve may be controlled to close, and then the control on the discharge superheat of the outdoor unit and the refrigerant volume flowing into the cooling indoor unit may also be realized.
- step S 103 when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches a maximum opening, a target opening of the second electronic expansion valve is calculated according to a total opening and the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit.
- the opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening, the discharge superheat of the outdoor unit may not be controlled. Then, the opening of the second electronic expansion valve needs to be adjusted to control the discharge superheat of the outdoor unit. Specifically, the target opening of the second electronic expansion valve is calculated by a formula of:
- EXV 2 EXV 2( PI )- EV (cooling indoor) MAX *( A EV(cooling indoor) /A EXV2 ) (1),
- ⁇ EXV2 is the target opening of the second electronic expansion valve
- EXV2(PI) is the total opening
- EV(cooling indoor)MAX is the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit
- a EV(cooling indoor) is a valve circulating area of the electronic expansion valve corresponding to the cooling indoor unit
- a EXV2 is a valve circulating area of the second electronic expansion valve.
- the total opening may be obtained by calculating in the pure heating mode.
- the discharge superheat, the discharge temperature and the returned-gas superheat of the outdoor unit are controlled by the second electronic expansion valve, such that the reliability of the compressor is ensured and the liquid strike on the compressor is avoided.
- the discharge superheat is obtained; and the total opening is calculated using a PI algorithm according to the discharge superheat.
- step 104 the second electronic expansion valve is controlled according to the target opening.
- the second electronic expansion valve is controlled according to the calculated target opening, such that the discharge superheat of the outdoor unit may be controlled.
- the refrigerating capacity of the cooling indoor unit may be controlled by controlling the refrigerant volume flowing into the cooling indoor unit so as to ensure the cooling effect of the cooling indoor unit.
- the discharge superheat is effectively controlled, such that the liquid strike on the compressor may be avoided, and the compressor is ensured to operate safely and reliably.
- a device for controlling refrigerant distribution of a multi-split air-conditioning system is also provided in the present disclosure.
- FIG. 3 is a block diagram of a device for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure.
- the multi-split air-conditioning system includes: a re-cooling system and a flow distributing device.
- the re-cooling system includes a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve.
- the device for controlling refrigerant distribution of a multi-split air-conditioning system includes: a first control component 10 , a second control component 20 , a calculating component 30 and a third control component 40 .
- the first control component 10 is configured to control the second electronic expansion valve to close when the multi-split air-conditioning system enters a main heating mode.
- the second control component 20 is configured to control an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment.
- the discharge superheat of an outdoor unit may be controlled by controlling an opening of the second electronic expansion valve.
- the discharge superheat of the outdoor unit and a refrigerant volume flowing into the cooling indoor unit are controlled by controlling the opening of the second electronic expansion valve and an opening of the electronic expansion valve corresponding to the cooling indoor unit.
- the opening of the second electronic expansion valve and the opening of the electronic expansion valve corresponding to the cooling indoor unit may be calculated according to the refrigerant volume required by the cooling indoor unit for cooling.
- the electronic expansion valve corresponding to the cooling indoor unit may also play the role of the second electronic expansion valve, i.e.
- the opening of the electronic expansion valve corresponding to the cooling indoor unit may be controlled by the second control component 20 preferentially in that mode, that is, before controlling by the second control component 20 the electronic expansion valve corresponding to the cooling indoor unit to perform the opening adjustment, the second electronic expansion valve may be controlled to close by the first control component 10 , and then the control on the discharge superheat of the outdoor unit and the refrigerant volume flowing into the cooling indoor unit may also be realized.
- the calculating component 30 is configured to calculate a target opening of the second electronic expansion valve according to a total opening and a maximum opening of the electronic expansion valve corresponding to the cooling indoor unit when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening.
- the opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening, the discharge superheat of the outdoor unit may not be controlled. Then, the opening of the second electronic expansion valve needs to be adjusted to control the discharge superheat of the outdoor unit. Specifically, the target opening of the second electronic expansion valve is calculated by the calculating component 30 based on a formula of:
- EXV 2 EXV 2( PI )- EV (cooling indoor) MAX *( A EV(cooling indoor) /A EXV2 ) (1),
- ⁇ EXV2 is the target opening of the second electronic expansion valve
- EXV2(PI) is the total opening
- EV(cooling indoor)MAX is the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit
- a EV(cooling indoor) is a valve circulating area of the electronic expansion valve corresponding to the cooling indoor unit
- a EXV2 is a valve circulating area of the second electronic expansion valve.
- the total opening may be obtained by calculating in the pure heating mode.
- the discharge superheat, the discharge temperature and the returned-gas superheat of the outdoor unit are controlled by the second electronic expansion valve, such that the reliability of the compressor is ensured and the liquid strike on the compressor is avoided.
- the discharge superheat is obtained; and the total opening is calculated using a PI algorithm according to the discharge superheat.
- the third control component 40 is configured to control the second electronic expansion valve according to the target opening.
- the second electronic expansion valve may be controlled according to the calculated target opening by the third control component 40 , such that the discharge superheat of the outdoor unit may be controlled.
- the device for controlling refrigerant distribution of a multi-split air-conditioning system in embodiments of the present disclosure, when the multi-split air-conditioning system enters the main cooling mode, first the second electronic expansion valve is controlled to close, the opening of the electronic expansion valve corresponding to the cooling indoor unit is controlled, and after the opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening, the opening of the second electronic expansion valve is controlled according to the total opening. Therefore, the refrigerating capacity of the cooling indoor unit may be controlled by controlling the refrigerant volume flowing into the cooling indoor unit so as to ensure the cooling effect of the cooling indoor unit. Meanwhile, according to the control of the total opening, the discharge superheat is effectively controlled, such that the liquid strike on the compressor may be avoided, and the compressor is ensured to operate safely and reliably.
- first and second are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features.
- the feature defined with “first” and “second” may comprise one or more of this feature.
- “a plurality of” means two or more than two, unless specified otherwise.
- the terms “mounted,” “connected,” “coupled,” “fixed” and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements, which can be understood by those skilled in the art according to specific situations.
- a structure in which a first feature is “on” or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween.
- a first feature “on,” “above,” or “on top of” a second feature may include an embodiment in which the first feature is right or obliquely “on,” “above,” or “on top of” the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature “below,” “under,” or “on bottom of” a second feature may include an embodiment in which the first feature is right or obliquely “below,” “under,” or “on bottom of” the second feature, or just means that the first feature is at a height lower than that of the second feature.
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Abstract
Description
- This application is a U.S. national phase application based upon International Application No. PCT/CN2016/080246, filed on Apr. 26, 2016, the entire contents of which are incorporated herein by reference.
- The present disclosure relates to air conditioner technology field, and more particularly to a method and a device for controlling refrigerant distribution of a multi-split air-conditioning system.
- When a multi-split air-conditioning system with two-pipe heating recycle is operating under a main heating mode, refrigerant is recooled via a heat exchanger, and then parts of the recooled refrigerant enters a low pressure pipe of an outdoor unit via an electronic expansion valve and another heat exchanger, and the rest of the recooled refrigerant finally enters the low pressure pipe of the outdoor unit after entering a cooling indoor unit to absorb heat via another electronic expansion valve.
- Refrigerant volume entering the cooling indoor unit and discharge superheat of the cooling indoor unit will be affected by an opening of the electronic expansion valve. When the refrigerant volume entering the cooling indoor unit is reduced because of the inappropriate opening of the electronic expansion valve, the cooling effect of the cooling indoor unit will be affected; and when the discharge superheat is reduced because of the inappropriate opening of the electronic expansion valve, the liquid strike on a compressor will be caused and the compressor is damaged.
- According to embodiments of the present disclosure, a method for controlling refrigerant distribution of a multi-split air-conditioning system is provided. The multi-split air-conditioning system includes: a re-cooling system including a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve, and a flow distributing device. The method includes followings: when the multi-split air-conditioning system enters a main heating mode, controlling the second electronic expansion valve to close; controlling an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment; when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches a maximum opening, calculating a target opening of the second electronic expansion valve according to a total opening and the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit; and controlling the second electronic expansion valve according to the target opening.
- According to embodiments of the present disclosure, a device for controlling refrigerant distribution of a multi-split air-conditioning system is provided. The multi-split air-conditioning system includes: a re-cooling system including a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve, and a flow distributing device. The device for controlling refrigerant distribution of a multi-split air-conditioning system includes: a first control component, configured to control the second electronic expansion valve to close when the multi-split air-conditioning system enters a main heating mode; a second control component, configured to control an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment; a calculating component, configured to calculate a target opening of the second electronic expansion valve according to a total opening and a maximum opening of the electronic expansion valve corresponding to the cooling indoor unit when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening; and a third control component, configured to control the second electronic expansion valve according to the target opening.
- According to embodiments of the present disclosure, a multi-split air-conditioning system is provided. The multi-split air-conditioning system includes: a re-cooling system, a flow distributing device and a controller. The re-cooling system includes a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve. The controller is configured to: when the multi-split air-conditioning system enters a main heating mode, control the second electronic expansion valve to close; control an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment; when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches a maximum opening, calculate a target opening of the second electronic expansion valve according to a total opening and the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit; and control the second electronic expansion valve according to the target opening.
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FIG. 1 is a flow chart of a method for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure. -
FIG. 2 is a schematic diagram of a multi-split air-conditioning system according to an embodiment of the present disclosure. -
FIG. 3 is a block diagram of a device for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure. - Exemplary embodiments of the present disclosure will be described in detail herein, and examples thereof are illustrated in accompanying drawings. Throughout figures referred by the following description, the same reference number in different figures indicates the same or similar elements unless otherwise stated. The embodiments described herein with reference to accompanying drawings are explanatory, illustrative, and used to generally interprete the present disclosure, but shall not be construed to limit the present disclosure.
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FIG. 1 is a flow chart of a method for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure. - In an embodiment of the present disclosure, as shown in
FIG. 2 , the multi-split air-conditioning system includes: a re-cooling system and a flow distributing device. The re-cooling system includes a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve. - As shown in
FIG. 1 , the method for controlling refrigerant distribution of a multi-split air-conditioning system includes followings. - In step S101, when the multi-split air-conditioning system enters a main heating mode, the second electronic expansion valve is controlled to close.
- In step S102, an electronic expansion valve corresponding to a cooling indoor unit is controlled to perform an opening adjustment.
- Generally, in a pure heating mode, the discharge superheat of an outdoor unit may be controlled by controlling an opening of the second electronic expansion valve. In the main heating mode, the discharge superheat of the outdoor unit and a refrigerant volume flowing into the cooling indoor unit are controlled by controlling the opening of the second electronic expansion valve and an opening of the electronic expansion valve corresponding to the cooling indoor unit. Specifically, the opening of the second electronic expansion valve and the opening of the electronic expansion valve corresponding to the cooling indoor unit may be calculated according to the refrigerant volume required by the cooling indoor unit for cooling. In an embodiment of the present disclosure, in the main heating mode, since the electronic expansion valve corresponding to the cooling indoor unit may also play the role of the second electronic expansion valve, i.e. the refrigerant through the cooling indoor unit, which is satisfied with the requirement of indoor cooling, will also obtain the superheat, such that the effect of avoiding the liquid strike on the compressor may be satisfied. Therefore the opening of the electronic expansion valve corresponding to the cooling indoor unit may be controlled preferentially in that mode, that is, in step S101, before controlling the electronic expansion valve corresponding to the cooling indoor unit to perform the opening adjustment, the second electronic expansion valve may be controlled to close, and then the control on the discharge superheat of the outdoor unit and the refrigerant volume flowing into the cooling indoor unit may also be realized.
- In step S103, when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches a maximum opening, a target opening of the second electronic expansion valve is calculated according to a total opening and the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit.
- When the opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening, the discharge superheat of the outdoor unit may not be controlled. Then, the opening of the second electronic expansion valve needs to be adjusted to control the discharge superheat of the outdoor unit. Specifically, the target opening of the second electronic expansion valve is calculated by a formula of:
-
ΔEXV2=EXV2(PI)-EV(cooling indoor)MAX*(A EV(cooling indoor) /A EXV2) (1), - where, ΔEXV2 is the target opening of the second electronic expansion valve, EXV2(PI) is the total opening, EV(cooling indoor)MAX is the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit, AEV(cooling indoor) is a valve circulating area of the electronic expansion valve corresponding to the cooling indoor unit, and AEXV2 is a valve circulating area of the second electronic expansion valve.
- The total opening may be obtained by calculating in the pure heating mode. When the multi-split air-conditioning system enters the pure heating mode, the discharge superheat, the discharge temperature and the returned-gas superheat of the outdoor unit are controlled by the second electronic expansion valve, such that the reliability of the compressor is ensured and the liquid strike on the compressor is avoided. Specifically, when the multi-split air-conditioning system enters the pure heating mode, the discharge superheat is obtained; and the total opening is calculated using a PI algorithm according to the discharge superheat.
- In step 104, the second electronic expansion valve is controlled according to the target opening.
- The second electronic expansion valve is controlled according to the calculated target opening, such that the discharge superheat of the outdoor unit may be controlled.
- With the method for controlling refrigerant distribution of a multi-split air-conditioning system in embodiments of the present disclosure, when the multi-split air-conditioning system enters the main cooling mode, first the second electronic expansion valve is controlled to close, the opening of the electronic expansion valve corresponding to the cooling indoor unit is controlled, and after the opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening, the opening of the second electronic expansion valve is controlled according to the total opening. Therefore, the refrigerating capacity of the cooling indoor unit may be controlled by controlling the refrigerant volume flowing into the cooling indoor unit so as to ensure the cooling effect of the cooling indoor unit. Meanwhile, according to the control of the total opening, the discharge superheat is effectively controlled, such that the liquid strike on the compressor may be avoided, and the compressor is ensured to operate safely and reliably.
- In order to realize the method for controlling refrigerant distribution of a multi-split air-conditioning system, a device for controlling refrigerant distribution of a multi-split air-conditioning system is also provided in the present disclosure.
-
FIG. 3 is a block diagram of a device for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure. - In an embodiment of the present disclosure, as shown in
FIG. 2 , the multi-split air-conditioning system includes: a re-cooling system and a flow distributing device. The re-cooling system includes a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve. - As shown in
FIG. 3 , the device for controlling refrigerant distribution of a multi-split air-conditioning system includes: afirst control component 10, asecond control component 20, a calculatingcomponent 30 and athird control component 40. - The
first control component 10 is configured to control the second electronic expansion valve to close when the multi-split air-conditioning system enters a main heating mode. Thesecond control component 20 is configured to control an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment. - Generally, in a pure heating mode, the discharge superheat of an outdoor unit may be controlled by controlling an opening of the second electronic expansion valve. In the main heating mode, the discharge superheat of the outdoor unit and a refrigerant volume flowing into the cooling indoor unit are controlled by controlling the opening of the second electronic expansion valve and an opening of the electronic expansion valve corresponding to the cooling indoor unit. Specifically, the opening of the second electronic expansion valve and the opening of the electronic expansion valve corresponding to the cooling indoor unit may be calculated according to the refrigerant volume required by the cooling indoor unit for cooling. In an embodiment of the present disclosure, in the main heating mode, since the electronic expansion valve corresponding to the cooling indoor unit may also play the role of the second electronic expansion valve, i.e. the refrigerant through the cooling indoor unit, which is satisfied with the requirement of indoor cooling, will also obtain the superheat, such that the effect of avoiding the liquid strike on the compressor may be satisfied. Therefore, the opening of the electronic expansion valve corresponding to the cooling indoor unit may be controlled by the
second control component 20 preferentially in that mode, that is, before controlling by thesecond control component 20 the electronic expansion valve corresponding to the cooling indoor unit to perform the opening adjustment, the second electronic expansion valve may be controlled to close by thefirst control component 10, and then the control on the discharge superheat of the outdoor unit and the refrigerant volume flowing into the cooling indoor unit may also be realized. - The calculating
component 30 is configured to calculate a target opening of the second electronic expansion valve according to a total opening and a maximum opening of the electronic expansion valve corresponding to the cooling indoor unit when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening. - When the opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening, the discharge superheat of the outdoor unit may not be controlled. Then, the opening of the second electronic expansion valve needs to be adjusted to control the discharge superheat of the outdoor unit. Specifically, the target opening of the second electronic expansion valve is calculated by the calculating
component 30 based on a formula of: -
ΔEXV2=EXV2(PI)-EV(cooling indoor)MAX*(A EV(cooling indoor) /A EXV2) (1), - where, ΔEXV2 is the target opening of the second electronic expansion valve, EXV2(PI) is the total opening, EV(cooling indoor)MAX is the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit, AEV(cooling indoor) is a valve circulating area of the electronic expansion valve corresponding to the cooling indoor unit, and AEXV2 is a valve circulating area of the second electronic expansion valve.
- The total opening may be obtained by calculating in the pure heating mode. When the multi-split air-conditioning system enters the pure heating mode, the discharge superheat, the discharge temperature and the returned-gas superheat of the outdoor unit are controlled by the second electronic expansion valve, such that the reliability of the compressor is ensured and the liquid strike on the compressor is avoided. Specifically, when the multi-split air-conditioning system enters the pure heating mode, the discharge superheat is obtained; and the total opening is calculated using a PI algorithm according to the discharge superheat.
- The
third control component 40 is configured to control the second electronic expansion valve according to the target opening. - The second electronic expansion valve may be controlled according to the calculated target opening by the
third control component 40, such that the discharge superheat of the outdoor unit may be controlled. - With the device for controlling refrigerant distribution of a multi-split air-conditioning system in embodiments of the present disclosure, when the multi-split air-conditioning system enters the main cooling mode, first the second electronic expansion valve is controlled to close, the opening of the electronic expansion valve corresponding to the cooling indoor unit is controlled, and after the opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening, the opening of the second electronic expansion valve is controlled according to the total opening. Therefore, the refrigerating capacity of the cooling indoor unit may be controlled by controlling the refrigerant volume flowing into the cooling indoor unit so as to ensure the cooling effect of the cooling indoor unit. Meanwhile, according to the control of the total opening, the discharge superheat is effectively controlled, such that the liquid strike on the compressor may be avoided, and the compressor is ensured to operate safely and reliably.
- In the specification, it is to be understood that terms such as “central,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial”, “radial” and “circumference” should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not require that the present invention be constructed or operated in a particular orientation.
- In addition, terms such as “first” and “second” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, the feature defined with “first” and “second” may comprise one or more of this feature. In the description of the present invention, “a plurality of” means two or more than two, unless specified otherwise.
- In the present invention, unless specified or limited otherwise, the terms “mounted,” “connected,” “coupled,” “fixed” and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements, which can be understood by those skilled in the art according to specific situations.
- In the present invention, unless specified or limited otherwise, a structure in which a first feature is “on” or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween. Furthermore, a first feature “on,” “above,” or “on top of” a second feature may include an embodiment in which the first feature is right or obliquely “on,” “above,” or “on top of” the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature “below,” “under,” or “on bottom of” a second feature may include an embodiment in which the first feature is right or obliquely “below,” “under,” or “on bottom of” the second feature, or just means that the first feature is at a height lower than that of the second feature.
- Reference throughout this specification to phrases like “an embodiment,” “some embodiments,” “one embodiment”, “another example,” “an example,” “a specific example,” or “some examples,” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the above phrases in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
- Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.
Claims (12)
ΔEXV2=EXV2(PI)-EV(cooling indoor)MAX*(A EV(cooling indoor) /A EXV2),
ΔEXV2=EXV2(PI)-EV(cooling indoor)MAX*(A EV(cooling indoor) /A EXV2),
ΔEXV2=EXV2(PI)-EV(cooling indoor)MAX*(A EV(cooling indoor) /A EXV2),
ΔEXV2=EXV2(PI)-EV(cooling indoor)MAX*(A EV(cooling indoor) /A EXV2),
ΔEXV2=EXV2(PI)-EV(cooling indoor)MAX*(A EV(cooling indoor) /A EXV2),
ΔEXV2=EXV2(PI)-EV(cooling indoor)MAX*(A EV(cooling indoor) /A EXV2),
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CN201510395506.1 | 2015-07-06 | ||
CN201510395506.1A CN105115199B (en) | 2015-07-06 | 2015-07-06 | The coolant distribution control method and device of multiple on-line system |
PCT/CN2016/080246 WO2017005036A1 (en) | 2015-07-06 | 2016-04-26 | Multi-line apparatus system refrigerant flow control method and device |
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US20170198956A1 true US20170198956A1 (en) | 2017-07-13 |
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US15/326,184 Abandoned US20170198956A1 (en) | 2015-07-06 | 2016-04-26 | Method and device for controlling refrigerant distribution of multi-split air-conditioning system |
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US (1) | US20170198956A1 (en) |
EP (1) | EP3182039B1 (en) |
CN (1) | CN105115199B (en) |
WO (1) | WO2017005036A1 (en) |
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US11125473B2 (en) | 2017-02-13 | 2021-09-21 | Fujitsu General Limited | Air conditioner |
CN115371302A (en) * | 2022-07-14 | 2022-11-22 | 浙江中广电器集团股份有限公司 | Control method for EVI multi-split refrigeration mode enthalpy injection control of heat pump |
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CN105115199B (en) * | 2015-07-06 | 2017-10-31 | 广东美的暖通设备有限公司 | The coolant distribution control method and device of multiple on-line system |
CN105588284A (en) * | 2016-01-04 | 2016-05-18 | 广东美的暖通设备有限公司 | Method and device for controlling distribution of refrigerants of indoor units of air conditioning system |
CN105698268B (en) * | 2016-03-23 | 2018-06-29 | 广东美的暖通设备有限公司 | Multi-line system and its control method for heating restricting element |
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Also Published As
Publication number | Publication date |
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WO2017005036A1 (en) | 2017-01-12 |
EP3182039A1 (en) | 2017-06-21 |
CN105115199B (en) | 2017-10-31 |
CN105115199A (en) | 2015-12-02 |
EP3182039B1 (en) | 2020-09-30 |
EP3182039A4 (en) | 2018-05-02 |
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