EP3467390A1 - Système multi-split et procédé de commande d'élément d'étranglement de chauffage associé - Google Patents

Système multi-split et procédé de commande d'élément d'étranglement de chauffage associé Download PDF

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Publication number
EP3467390A1
EP3467390A1 EP17802044.2A EP17802044A EP3467390A1 EP 3467390 A1 EP3467390 A1 EP 3467390A1 EP 17802044 A EP17802044 A EP 17802044A EP 3467390 A1 EP3467390 A1 EP 3467390A1
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EP
European Patent Office
Prior art keywords
compressor
pressure
pressure difference
target
throttling element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17802044.2A
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German (de)
English (en)
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EP3467390B1 (fr
EP3467390A4 (fr
Inventor
Bin Luo
Yuanyang Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Publication of EP3467390A1 publication Critical patent/EP3467390A1/fr
Publication of EP3467390A4 publication Critical patent/EP3467390A4/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • 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
    • 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

Definitions

  • the present disclosure relates to air conditioner field, and more particularly, to a method for controlling a heating throttling element in a multi-split air conditioning system and a multi-split air conditioning system.
  • the multi-split air conditioning system has four modes, including a pure refrigerating mode, a pure heating mode, a main refrigerating mode and a main heating mode.
  • the main refrigerating mode and the main heating mode can simultaneously utilize condensation heat and evaporation heat of the system to achieve simultaneous refrigerating and heating, which greatly improves the energy efficiency of the system.
  • the high-pressure gas of the high-pressure pipe of the outdoor unit enters the heating indoor unit, after it releases heat in the heating indoor unit, it expands into the low-pressure gas through the electronic expansion valve to return to the outdoor unit.
  • the opening of the electronic expansion valve will affect the refrigerant flow entering the heating indoor unit, and the condensation temperature of the heating indoor unit will be adjusted.
  • the heating indoor unit having a suitable opening will have both a greater refrigerant flow and a higher condensing temperature, thereby outputting a higher heating capacity.
  • an objective of the present disclosure is to provide a method for controlling a heating throttling element in a multi-split air conditioning system, the opening of the heating throttling element is adjusted by the pressure difference between the high pressure and the intermediate pressure of the shunt device, such that the multi-split air conditioning system can not only meet liquid discharge requirements, but also have good performance and energy efficiency during heating, and especially during partial load heating, user experience can be improved.
  • Another objective of the present disclosure is to provide a non-transitory computer readable storage medium.
  • Another objective of the present disclosure is to provide a multi-split air conditioning system.
  • inventions of an aspect of the present disclosure provide a method for controlling a heating throttling element in a multi-split air conditioning system.
  • the multi-split air conditioning system includes an outdoor unit, a shunt device and a plurality of indoor units.
  • the outdoor unit includes a compressor.
  • the shunt device includes a first heat exchanger, a second heat exchanger and a heating throttling element.
  • An outlet of a first heat exchange flow path of the first heat exchanger is in communication with an inlet of a first heat exchange flow path of the second heat exchanger
  • an outlet of a second heat exchange flow path of the second heat exchanger is in communication with an inlet of a second heat exchange flow path of the first heat exchanger
  • the heating throttling element is disposed between the outlet of the first heat exchange flow path of the second heat exchanger and the inlet of the second heat exchange flow path of the second heat exchanger.
  • the method includes: obtaining a target exhaust pressure of the compressor or a saturation temperature corresponding to the target exhaust pressure; controlling the compressor based on the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure to make the compressor operate stably, obtaining a high pressure and an intermediate pressure of the shunt device after the compressor operates stably, and calculating a pressure difference between the high pressure and the intermediate pressure; and obtaining a target pressure difference between the high pressure and the intermediate pressure of the shunt device, and adjusting an opening of the heating throttling element based on the pressure difference and the target pressure difference.
  • the target exhaust pressure of the compressor or the saturation temperature corresponding to the target exhaust pressure is obtained first, and then the compressor is controlled based on the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure to make the compressor operate stably, after the compressor operates stably, the high pressure and the intermediate pressure of the shunt device are obtained, and the pressure difference between the high pressure and the intermediate pressure is calculated, and finally the target pressure difference between the high pressure and the intermediate pressure of the shunt device is obtained, and the opening of the heating throttling element is adjusted based on the pressure difference and the target pressure difference, such that the multi-split air conditioning system can not only meet liquid discharge requirements, but also have good performance and energy efficiency during heating, and especially during partial load heating, user experience can be improved.
  • adjusting the opening of the heating throttling element based on the pressure difference and the target pressure difference includes: decreasing the opening of the heating throttling element when the pressure difference is greater than the target pressure difference; and increasing the opening of the heating throttling element when the pressure difference is less than the target pressure difference.
  • the method further includes: determining whether the pressure difference is equal to the target pressure difference, and determining whether a saturation temperature corresponding to a current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, and determining whether an operating frequency of the compressor is greater than or equal to a maximum frequency; and controlling the opening of the heating throttling element to keep unchanged, when the pressure difference is equal to the target pressure difference, or the saturation temperature corresponding to the current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, or the operating frequency of the compressor is greater than or equal to the maximum frequency.
  • the saturation temperature corresponding to the current exhaust pressure of the compressor is less than the saturation temperature corresponding to the target exhaust pressure of the compressor, and the operating frequency of the compressor is less than the maximum frequency
  • the operating frequency of the compressor is adjusted, and the opening of the heating throttling element is adjusted based on the adjusted operating frequency of the compressor.
  • the multi-split air conditioning system is configured to operate in a heating mode, a main heating mode, or a main refrigerating mode.
  • the present disclosure further provides a non-transitory computer readable storage medium having computer programs stored thereon.
  • the computer programs are executed by a processor, the above method for controlling a heating throttling element in a multi-split air conditioning system is implemented.
  • the opening of the heating throttling element is adjusted based on the pressure difference between the high pressure and the intermediate pressure of the shunt device, such that the multi-split air conditioning system can not only meet liquid discharge requirements, but also have good performance and energy efficiency during heating, and especially during partial load heating, user experience can be improved.
  • the multi-split air conditioning system includes an outdoor unit, a shunt device, a plurality of indoor units and a control module.
  • the outdoor unit includes a compressor
  • the shunt device includes a first heat exchanger, a second heat exchanger and a heating throttling element.
  • An outlet of a first heat exchange flow path of the first heat exchanger is in communication with an inlet of a first heat exchange flow path of the second heat exchanger
  • an outlet of a second heat exchange flow path of the second heat exchanger is in communication with an inlet of a second heat exchange flow path of the first heat exchanger
  • the heating throttling element is disposed between the outlet of the first heat exchange flow path of the second heat exchanger and the inlet of the second heat exchange flow path of the second heat exchanger.
  • the control module is configured to: obtain a target exhaust pressure of the compressor or a saturation temperature corresponding to the target exhaust pressure; control the compressor based on the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure to make the compressor operate stably, obtain a high pressure and an intermediate pressure of the shunt device after the compressor operates stably, and calculate a pressure difference between the high pressure and the intermediate pressure; and obtain a target pressure difference between the high pressure and the intermediate pressure of the shunt device, and adjust an opening of the heating throttling element based on the pressure difference and the target pressure difference.
  • the control module obtains the target exhaust pressure of the compressor or the saturation temperature corresponding to the target exhaust pressure first, and controls the compressor based on the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure to make the compressor operate stably, after the compressor operates stably, the control module obtains the high pressure and the intermediate pressure of the shunt device, then, the control module calculates the pressure difference between the high pressure and the intermediate pressure, obtains the target pressure difference between the high pressure and the intermediate pressure of the shunt device, and adjusts the opening of the heating throttling element based on the pressure difference and the target pressure difference, such that the multi-split air conditioning system can not only meet liquid discharge requirements, but also have good performance and energy efficiency during heating, and especially during partial load heating, user experience can be improved.
  • control module when the control module is configured to adjust the opening of the heating throttling element based on the pressure difference and the target pressure difference, the control module is configured to: decrease the opening of the heating throttling element when the pressure difference is greater than the target pressure difference; and increase the opening of the heating throttling element when the pressure difference is less than the target pressure difference.
  • the control module is further configured to: determine whether the pressure difference is equal to the target pressure difference, and determine whether a saturation temperature corresponding to a current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, and determine whether an operating frequency of the compressor is greater than or equal to a maximum frequency; and control the opening of the heating throttling element to keep unchanged, when the pressure difference is equal to the target pressure difference, or the saturation temperature corresponding to the current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, or the operating frequency of the compressor is greater than or equal to the maximum frequency.
  • the control module is configured to adjust the operating frequency of the compressor, and adjust the opening of the heating throttling element based on the adjusted operating frequency of the compressor.
  • the multi-split air conditioning system is configured to operate in a heating mode, a main heating mode, or a main refrigerating mode.
  • outdoor unit 10 a plurality of indoor units 20, shunt device 30, gas-liquid separator 31, first heat exchanger 32, second heat exchanger 33, first throttling element 34, and heating throttling element 35.
  • the multi-split air conditioning system includes an outdoor unit, a shunt device and a plurality of indoor units.
  • the outdoor unit includes a compressor.
  • the shunt device includes a first heat exchanger, a second heat exchanger and a heating throttling element.
  • An outlet of a first heat exchange flow path of the first heat exchanger is in communication with an inlet of a first heat exchange flow path of the second heat exchanger
  • an outlet of a second heat exchange flow path of the second heat exchanger is in communication with an inlet of a second heat exchange flow path of the first heat exchanger
  • the heating throttling element is disposed between the outlet of the first heat exchange flow path of the second heat exchanger and the inlet of the second heat exchange flow path of the second heat exchanger.
  • the multi-split air conditioning system includes an outdoor unit 10, a plurality of indoor units 20 and a shunt device 30.
  • the outdoor unit 10 includes a compressor (not specifically shown in the drawings).
  • the shunt device 30 includes a gas-liquid separator 31, a first heat exchanger 32, a second heat exchanger 33, a first throttling element 34 and a heating throttling element 35.
  • a first end of the gas-liquid separator 31 is connected to an end of the outdoor unit 10.
  • a second end of the gas-liquid separator 31 is in communication with the inlet of the first heat exchange flow path of the first heat exchanger 32, the first throttling element 34 is disposed between the outlet of the first heat exchange flow path of the first heat exchanger 32 and the inlet of the first heat exchange flow path of the second heat exchanger 33.
  • the heating throttling element 35 is disposed between the outlet of the first heat exchange flow path of the second heat exchanger 33 and the inlet of the second heat exchange flow path of the second heat exchanger 33, the outlet of the second heat exchange flow path of the second heat exchanger 33 is in communication with the inlet of the second heat exchange flow path of the first heat exchanger 32, and the outlet of the second heat exchange flow path of the first heat exchanger 32 is in communication with the another end of the outdoor unit 10 and an end of the refrigerating indoor unit, respectively.
  • Another end of the refrigerating indoor unit is in communication with the outlet of the first heat exchange flow path of the second heat exchanger 33, a third end of the gas-liquid separator 31 is in communication with an end of the heating indoor unit, and another end of the heating indoor unit is in communication with the inlet of the first heat exchange flow path of the second heat exchanger 33.
  • the first throttling element and the heating throttling element may be electronic expansion valves, and the first heat exchanger and the second heat exchanger may be plate heat exchangers.
  • the refrigerant flow rate and flow velocity entering the heating indoor unit will be reduced.
  • the opening of the heating throttling element when the opening of the heating throttling element is too large, the pressure difference between inlet and outlet of the heating indoor unit will be increased, and the refrigerant flow rate and flow velocity entering the heating indoor unit will be increased.
  • the heating indoor unit is not prone to liquid storage, the outlet supercooling degree of the heating indoor unit will be too small, and the upstream supercooling degree SCm2 of the heating throttling element will be too small, and there may be gas upstream of the valve, which may cause system instability.
  • the opening of the heating throttling element when the opening of the heating throttling element is too large, the operating frequency of the compressor will increase, the system energy efficiency will decrease, and the high pressure may fail to reach, and the exhaust superheat of the compressor may sometimes be low.
  • the opening of the heating throttling element is relatively small.
  • Fig. 2 is a flow chart of a method for controlling a heating throttling element in a multi-split air conditioning system according to an embodiment of the present disclosure. As illustrated in Fig. 2 , the method may include following operations.
  • a target exhaust pressure of the compressor or a saturation temperature corresponding to the target exhaust pressure is obtained.
  • the compressor is controlled based on the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure to make the compressor operate stably, and after the compressor operates stably, a high pressure and an intermediate pressure of the shunt device are obtained, and a pressure difference between the high pressure and the intermediate pressure is calculated.
  • the exhaust pressure Pc of the compressor can be obtained in real time by a pressure sensor disposed at an exhaust port of the compressor, or after the exhaust pressure Pc of the compressor is obtained, the saturation temperature Tc corresponding to the exhaust pressure can be obtained based on the exhaust pressure Pc.
  • PI Proportional Integral
  • the high pressure Ps1 can be obtained by a pressure sensor disposed at the outlet of the first heat exchange flow path of the first heat exchanger of the shunt device, and the intermediate pressure Ps2 can be obtained by a pressure sensor disposed at the inlet of the first heat exchange flow path of the second heat exchanger.
  • a target pressure difference between the high pressure and the intermediate pressure of the shunt device is obtained, and an opening of the heating throttling element is adjusted based on the pressure difference and the target pressure difference.
  • the target pressure difference ⁇ Ps is the pressure difference between the high pressure and the intermediate pressure of the shunt device when the system has no liquid accumulation, and the target pressure difference is obtained by experimental verification.
  • the target pressure difference ⁇ Ps is generally a small value that can ensure system refrigerant flow rate and satisfy high pressure.
  • adjusting the opening of the heating throttling element based on the pressure difference and the target pressure difference includes: decreasing the opening of the heating throttling element when the pressure difference is greater than the target pressure difference, and increasing the opening of the heating throttling element when the pressure difference is less than the target pressure difference.
  • PI adjustment is performed on the heating throttling element from an initial opening based on the pressure difference ⁇ P between the high pressure Ps1 and the intermediate pressure Ps2 and the target pressure difference ⁇ Ps.
  • the method further includes following operations. It is determined whether the pressure difference is equal to the target pressure difference, and it is determined whether a saturation temperature corresponding to a current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, and it is determined whether an operating frequency of the compressor is greater than or equal to a maximum frequency, when the pressure difference is equal to the target pressure difference, or the saturation temperature corresponding to the current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, or the operating frequency of the compressor is greater than or equal to the maximum frequency, the opening of the heating throttling element is controlled to keep unchanged.
  • the saturation temperature corresponding to the current exhaust pressure of the compressor is less than the saturation temperature corresponding to the target exhaust pressure of the compressor, and the operating frequency of the compressor is less than the maximum frequency, the operating frequency of the compressor is adjusted, and the opening of the heating throttling element is adjusted based on the adjusted operating frequency of the compressor.
  • ⁇ P ⁇ Ps and Pc ⁇ Pcs (or Tc ⁇ Tcs), or whether the compressor is in full operating frequency.
  • ⁇ P ⁇ P, or ⁇ P ⁇ Ps but Pc ⁇ Pcs (or Tc ⁇ Tcs), or ⁇ P ⁇ Ps but the compressor is in full operating frequency
  • the opening of the heating throttling element is controlled to keep unchanged.
  • the operating frequency of the compressor is adjusted, and the opening of the heating throttling element is readjusted until the above conditions are met, indicating that the system has reached a steady state, and the opening of the heating throttling element can be stabilized at the opening, such that the system can have better system performance and energy efficiency under heating, especially under partial load heating.
  • FIG. 3 is a flow chart of a method for controlling a heating throttling element in a multi-split air conditioning system according to an embodiment of the present disclosure.
  • the method for controlling a heating throttling element in a multi-split air conditioning system may include the following operations.
  • PI adjustment is performed on the operating frequency of the compressor based on a difference between the exhaust pressure Pc (or the saturation temperature Tc corresponding to the exhaust pressure) and the target exhaust pressure Pcs (or the saturation temperature Tcs corresponding to the target exhaust pressure), to obtain a new exhaust pressure Pc (or a saturation temperature Tc corresponding to the new exhaust pressure), a high pressure Ps1 and an intermediate pressure Ps2.
  • PI adjustment is performed on the opening of the heating throttling element based on the difference between the pressure difference ⁇ P and the target pressure difference ⁇ Ps.
  • the heating throttling element is kept at the opening and the system operates stably.
  • the target exhaust pressure of the compressor or the saturation temperature corresponding to the target exhaust pressure is obtained first, and then the compressor is controlled based on the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure to make the compressor operate stably, after the compressor operates stably, the high pressure and the intermediate pressure of the shunt device are obtained, and the pressure difference between the high pressure and the intermediate pressure is calculated, and finally the target pressure difference between the high pressure and the intermediate pressure of the shunt device is obtained, and the opening of the heating throttling element is quickly adjusted based on the pressure difference and the target pressure difference, such that the multi-split air conditioning system can not only meet liquid discharge requirements, but also have good performance and energy efficiency during heating, and especially during partial load heating, user experience can be improved.
  • the present disclosure further provides a non-transitory computer readable storage medium having computer programs stored thereon.
  • the computer programs are executed by a processor, the above method for controlling a heating throttling element in a multi-split air conditioning system is implemented.
  • the opening of the heating throttling element is adjusted based on the pressure difference between the high pressure and the intermediate pressure of the shunt device, such that the multi-split air conditioning system can not only meet liquid discharge requirements, but also have good performance and energy efficiency during heating, and especially during partial load heating, user experience can be improved.
  • Fig. 1 is a schematic diagram of a multi-split air conditioning system according to an embodiment of the present disclosure. As illustrated in Fig. 1 , the multi-split air conditioning system includes an outdoor unit 10, a plurality of indoor units 20, a shunt device 30 and a control module (not specifically shown in the drawings).
  • the outdoor unit 10 includes a compressor (not specifically shown in the drawings).
  • the shunt device 30 includes a first heat exchanger 32, a second heat exchanger 33 and a heating throttling element 35.
  • An outlet of a first heat exchange flow path of the first heat exchanger 32 is in communication with an inlet of a first heat exchange flow path of the second heat exchanger 33
  • an outlet of a second heat exchange flow path of the second heat exchanger 33 is in communication with an inlet of a second heat exchange flow path of the first heat exchanger 32
  • the heating throttling element 35 is disposed between the outlet of the first heat exchange flow path of the second heat exchanger 33 and the inlet of the second heat exchange flow path of the second heat exchanger 33.
  • the control module is configured to obtain a target exhaust pressure of the compressor or a saturation temperature corresponding to the target exhaust pressure, control the compressor based on the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure to make the compressor operate stably, and obtain a high pressure and an intermediate pressure of the shunt device 30 after the compressor operates stably, and calculate a pressure difference between the high pressure and the intermediate pressure, and obtain a target pressure difference between the high pressure and the intermediate pressure of the shunt device 30, and adjust an opening of the heating throttling element 35 based on the pressure difference and the target pressure difference.
  • the target pressure difference is the pressure difference between the high pressure and the intermediate pressure of the shunt device when the system has no liquid accumulation, and the target pressure difference is obtained by experimental verification.
  • the target pressure difference is generally a small value that can ensure system refrigerant flow rate and satisfy high pressure.
  • control module when the control module is configured to adjust the opening of the heating throttling element based on the pressure difference and the target pressure difference, the control module is configured to decrease the opening of the heating throttling element 35 when the pressure difference is greater than the target pressure difference, and increase the opening of the heating throttling element 35 when the pressure difference is less than the target pressure difference.
  • the control module first obtains the exhaust pressure Pc of the compressor in real time by a pressure sensor disposed at an exhaust port of the compressor, or obtains the saturation temperature Tc corresponding to the exhaust pressure based on the exhaust pressure Pc after the exhaust pressure Pc of the compressor is obtaine.
  • the control module performs PI (Proportional Integral) adjustment on the operating frequency of the compressor, to obtain a new exhaust pressure Pc of the compressor (or the saturation pressure Tc corresponding to the new exhaust pressure), a high pressure Ps1 and an intermediate pressure Ps2 of the shunt device 30 after the compressor operates stably.
  • PI Proportional Integral
  • the high pressure Ps1 can be obtained by a pressure sensor disposed at the outlet of the first heat exchange flow path of the first heat exchanger 32 of the shunt device 30, and the intermediate pressure Ps2 can be obtained by the pressure sensor disposed at the inlet of the first heat exchange flow path of the second heat exchanger 33.
  • the control module performs PI adjustment on the heating throttling element 35 from an initial opening based on the pressure difference ⁇ P between the high pressure Ps1 and the intermediate pressure Ps2 and the target pressure difference ⁇ Ps.
  • the control module controls the opening of the heating throttling element to be decreased, in this case, the exhaust pressure Pc of the compressor (or the saturation temperature Tc corresponding to the exhaust pressure) is increased, and due to the flow rate is decreased, ⁇ P is decreased.
  • the control module controls the opening of the heating throttling element to be increased, in this case, the exhaust pressure Pc of the compressor (or the saturation temperature Tc corresponding to the exhaust pressure) is decreased, and due to the flow rate is increased, ⁇ P is increased.
  • the control module is further configured to determine whether the pressure difference is equal to the target pressure difference, and determine whether a saturation temperature corresponding to a current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, and determine whether an operating frequency of the compressor is greater than or equal to a maximum frequency, and control the opening of the heating throttling element 35 to keep unchanged when the pressure difference is equal to the target pressure difference, or the saturation temperature corresponding to the current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, or the operating frequency of the compressor is greater than or equal to the maximum frequency.
  • the control module is configured to adjust the operating frequency of the compressor, and adjust the opening of the heating throttling element 35 based on the adjusted operating frequency of the compressor.
  • ⁇ P ⁇ P, or ⁇ P ⁇ Ps but Pc ⁇ Pcs (or Tc ⁇ Tcs), or ⁇ P ⁇ Ps but the compressor is in full operating frequency
  • the control module controls the opening of the heating throttling element 35 to keep unchanged.
  • control module first adjusts the operating frequency of the compressor first, and readjusts the opening of the heating throttling element 35 until the above conditions are met, indicating that the system has reached a steady state, and the opening of the heating throttling element 35 can be stabilized at the opening, such that the system can have better system performance and energy efficiency under heating, especially under partial load heating.
  • the control module obtains the target exhaust pressure of the compressor or the saturation temperature corresponding to the target exhaust pressure first, and controls the compressor based on the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure to make the compressor operate stably, after the compressor operates stably, the control module obtains the high pressure and the intermediate pressure of the shunt device, then, the control module calculates the pressure difference between the high pressure and the intermediate pressure, obtains the target pressure difference between the high pressure and the intermediate pressure of the shunt device, and adjusts the opening of the heating throttling element based on the pressure difference and the target pressure difference, such that the multi-split air conditioning system can not only meet liquid discharge requirements, but also have good performance and energy efficiency during heating, and especially during partial load heating, user experience can be improved.
  • 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 include at least one feature.
  • a plurality of' means two or more than two.
  • 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.
  • the logic and/or step described in other manners herein or shown in the flow chart, for example, a particular sequence table of executable instructions for realizing the logical function may be specifically achieved in any computer readable medium to be used by the instruction execution system, device or equipment (such as the system based on computers, the system including processors or other systems capable of obtaining the instruction from the instruction execution system, device and equipment and executing the instruction), or to be used in combination with the instruction execution system, device and equipment.
  • the computer readable medium may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, device or equipment.
  • the computer readable medium include but are not limited to: an electronic connection (an electronic device) with one or more wires, a portable computer enclosure (a magnetic device), a random access memory (RAM), a read only memory (ROM), an erasable programmable read-only memory (EPROM or a flash memory), an optical fiber device and a portable compact disk read-only memory (CDROM).
  • the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in an electric manner, and then the programs may be stored in the computer memories.
  • each part of the present disclosure may be realized by the hardware, software, firmware or their combination.
  • a plurality of steps or methods may be realized by the software or firmware stored in the memory and executed by the appropriate instruction execution system.
  • the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Signal Processing (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
EP17802044.2A 2016-05-23 2017-05-09 Système multi-split et procédé de commande d'élément d'étranglement de chauffage associé Active EP3467390B1 (fr)

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CN201610351236.9A CN106016457B (zh) 2016-05-23 2016-05-23 多联机系统及其制热节流元件的控制方法
PCT/CN2017/083654 WO2017202198A1 (fr) 2016-05-23 2017-05-09 Système multi-split et procédé de commande d'élément d'étranglement de chauffage associé

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CN106016457B (zh) * 2016-05-23 2018-12-18 广东美的暖通设备有限公司 多联机系统及其制热节流元件的控制方法
CN106556113B (zh) * 2016-11-28 2019-07-26 广东美的暖通设备有限公司 多联机系统及其的中压节流元件的控制方法
CN107576110B (zh) * 2017-09-08 2019-12-27 合肥美的暖通设备有限公司 多联机系统及其控制方法和控制装置
CN110360704A (zh) * 2018-04-09 2019-10-22 珠海格力电器股份有限公司 空调连接管压力损耗补偿方法及装置
CN111473466B (zh) * 2020-04-21 2022-03-22 宁波奥克斯电气股份有限公司 一种频率控制方法及空调器
CN111578472B (zh) * 2020-05-29 2022-03-22 广东美的制冷设备有限公司 空调器室外机的控制方法及装置、空调器室外机及空调器
CN114061107B (zh) * 2021-12-27 2023-11-28 上海美控智慧建筑有限公司 一种多联机空调系统的控制方法及系统

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JPH1194384A (ja) * 1997-09-26 1999-04-09 Mitsubishi Heavy Ind Ltd 多室形空気調和装置
JP3849467B2 (ja) * 2001-07-11 2006-11-22 松下電器産業株式会社 空気調和機
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CN106016457B (zh) 2018-12-18
WO2017202198A1 (fr) 2017-11-30
EP3467390A4 (fr) 2019-07-31
CN106016457A (zh) 2016-10-12

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