EP3543618A1 - Dispositif de commande, système de climatisation à unités multiples équipé de celui-ci, procédé de commande et programme de commande - Google Patents

Dispositif de commande, système de climatisation à unités multiples équipé de celui-ci, procédé de commande et programme de commande Download PDF

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Publication number
EP3543618A1
EP3543618A1 EP18809354.6A EP18809354A EP3543618A1 EP 3543618 A1 EP3543618 A1 EP 3543618A1 EP 18809354 A EP18809354 A EP 18809354A EP 3543618 A1 EP3543618 A1 EP 3543618A1
Authority
EP
European Patent Office
Prior art keywords
indoor
unit
indoor unit
refrigerant
air conditioning
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.)
Withdrawn
Application number
EP18809354.6A
Other languages
German (de)
English (en)
Inventor
Takahiro Kato
Tatsuhiro Yasuda
Masayuki Takigawa
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.)
Mitsubishi Heavy Industries Thermal Systems Ltd
Original Assignee
Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Thermal Systems Ltd filed Critical Mitsubishi Heavy Industries Thermal Systems Ltd
Publication of EP3543618A1 publication Critical patent/EP3543618A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • F24F11/32—Responding to malfunctions or emergencies
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid 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
    • 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
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature sensors near the outdoor heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/02—Increasing the heating capacity of a reversible cycle during cold outdoor conditions
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/24—Low amount of refrigerant in the system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves

Definitions

  • the present disclosure relates to a control device, a multi-split air conditioning system provided with the same, and a control method and a control program.
  • a necessary refrigerant amount is changed depending on operating conditions such as cooling and heating, air conditions, and the like. Further, in a multi-split air conditioning system, a necessary refrigerant amount varies depending on the number of operating indoor units, in addition to operating state, air conditions, and the like.
  • the change in the necessary refrigerant amount corresponds to the refrigerant amount being adjusted a refrigerant amount by system control or receiver.
  • the operating indoor units are controlled to be supplied with the appropriate refrigerant amount.
  • Patent Document 1 described below discloses a technique that, in heating operation in which a stop load side unit and an operation load side unit are mixed, determines whether the refrigerant amount in an operation cycle is appropriate at regular time intervals, and when the refrigerant amount is not in an appropriate range, and that appropriately corrects an opening degree of an expansion valve that communicates with the stop load side unit to adjust the refrigerant amount.
  • Patent Document 2 described below discloses a technology that, an expansion valve of an indoor unit stopped is fully closed so that a cooling cycle during heating operation is caused not to be a deficient refrigerant state, and noise from a blower of the indoor unit stopped in a quiet environment is reduced, and an indoor unit to be fully closed can be automatically and manually selected.
  • Patent Document 3 described below discloses a technology that a stopped indoor unit in which the expansion valve is to be closed is arbitrarily selected in a thermo-off state.
  • a refrigerant amount is adjusted by accumulating a fraction of refrigerant into a stopped indoor unit in a receiver or a multi-split air conditioning system.
  • Patent Document 1 when the refrigerant amount in the air conditioning system is excessive, the refrigerant flow rate may not be adjusted and the refrigerant may not be stored by the receiver or the like even if the opening degree of the expansion valve of the stop load side unit is adjusted. As a result, there is a problem that the refrigerant amount becomes excessive in the operating load side unit, and the heating capacity is deficient. In Patent Documents 2 and 3, the case where the refrigerant amount is excessive is not assumed, thus the problem of heating capacity being deficient due to the excessive refrigerant amount cannot be resolved.
  • a purpose of the present disclosure is to provide a control device that can prevent deficiency of heating capacity without increasing the cost, a multi-split air conditioning system provided with the same, and a control method and a control program.
  • the present disclosure provides the following means.
  • a control device configured to control operation of a multi-split air conditioning system in which a plurality of indoor units are connected to an outdoor unit, and refrigerant flow rate that flows through refrigerant piping is adjusted by an opening degree of an expansion valve of the indoor unit, the control device includes a detection unit configured to detect whether deficiency of heating capacity occurs in an indoor unit performing heating operation, and a control unit that fully closes the expansion valve of stopped indoor unit that is an indoor unit not in operation, in a case where the indoor unit having the deficiency of heating capacity is detected.
  • the present aspect in a case where deficiency of heating capacity is detected in the indoor unit performing heating operation, by fully closing the expansion valve of a stopped indoor unit that is an indoor unit not in operation, a part of the refrigerant flowing through the refrigerant piping of the indoor unit performing heating operation is stored on a stopped indoor unit side.
  • the refrigerant flow rate of the indoor unit performing heating operation can be reduced, even if the deficiency of heating capacity occurs due to excessive refrigerant flow rate, the deficiency of heating capacity can be improved.
  • the existing air conditioning system can be redundant.
  • the control device described above may further include a determination unit configured to determine whether a period, in which a first temperature difference between a set temperature of the indoor unit and an indoor temperature of a room in which air conditioning is to be performed by the indoor unit is not less than a first predetermined value, continues for a first predetermined period or longer, or determine whether a second temperature difference in the refrigerant piping between two points of an outlet and another point except the outlet in a section from an inlet to the outlet of an indoor heat exchanger disposed in the indoor unit, is not greater than a second predetermined value.
  • the detection unit may detect that the deficiency of heating capacity has occurred, in a case where a determination result of the determination unit is affirmative.
  • heating operation it is possible to determine whether the room in which air conditioning is to be performed is not sufficiently warm, whether the refrigerant is accumulated in the indoor units, or the like, and the deficiency of heating capacity has occurred can be detected.
  • the determination unit of the control device described above may determine a third temperature difference between an indoor temperature of a room in which air conditioning is to be performed by the indoor unit and a refrigerant temperature at a bend part or an inlet of the refrigerant piping of the indoor heat exchanger disposed in the indoor unit, is not greater than a third predetermined value.
  • the accumulated refrigerant temperature is close to the indoor temperature (suction temperature) of the indoor units.
  • a deficiency of heating capacity may be detected by comparing the indoor temperature and the refrigerant temperature of the bend part or the inlet of the refrigerant piping.
  • the temperature sensor disposed on the refrigerant piping at the outlet side of the indoor heat exchanger can be reduced.
  • the control unit of the control device described above may fully close the expansion valves of all of the indoor units not in operation or a part of the indoor units not in operation.
  • the indoor units in which the expansion valves of the indoor units are fully closed are set as all of the indoor units not in operation or a part of the indoor units not in operation. According to the present aspect, control can be performed according to the excess of the operating indoor unit with respect to the required refrigerant flow rate.
  • control unit of the control device described above may select the indoor unit in which the expansion valve is fully closed based on an address preset for the indoor unit.
  • the indoor units in which the expansion valve is closed can be quickly determined.
  • control unit of the control device described above may select the indoor unit in which a period during which the operation is stopped is not less than a second predetermined period.
  • the indoor unit in which a period during which the operation is stopped is not less than a second predetermined period is selected as the indoor unit in which the expansion valve is fully closed. According to the present aspect, it is possible to avoid controlling an expansion valve of an indoor unit operated frequently to be fully closed, and is prevented from being different from a normal operation.
  • the present disclosure provides a multi-split air conditioning system including the control device according to any one of the aspects described above, an outdoor unit, and a plurality of indoor units connected to the outdoor unit.
  • the present disclosure provides a control method for controlling operation of a multi-split air conditioning system in which a plurality of indoor units are connected to an outdoor unit, and refrigerant flow rate that flows through refrigerant piping is adjusted by an opening degree of an expansion valve of the indoor unit, the control method includes, detecting whether deficiency of heating capacity occurs in an indoor unit performing heating operation, and fully closing the expansion valve of a stopped indoor unit that is an indoor unit not in operation, in a case where the indoor unit having the deficiency of heating capacity is detected.
  • the present disclosure provides a control program for controlling operation of a multi-split air conditioning system in which a plurality of indoor units are connected to an outdoor unit, and refrigerant flow rate that flows through refrigerant piping is adjusted by an opening degree of an expansion valve of the indoor unit, the control program causes a computer to execute: a process of detecting whether deficiency of heating capacity occurs in an indoor unit performing heating operation, and a process of fully closing the expansion valve of a stopped indoor unit that is an indoor unit not in operation, in a case where the indoor unit having the deficiency of heating capacity is detected.
  • the present disclosure achieves the effect of providing a control device of a multi-split air conditioning system that is capable of preventing deficiency of heating capacity without increasing the cost.
  • FIG. 1 An embodiment of the present disclosure will be described with reference to FIG. 1 .
  • FIG. 1 schematically illustrates a refrigerant circuit of a multi-split air conditioning system 1 according to the present embodiment.
  • a plurality of indoor units 3A and 3B are connected in parallel to one outdoor unit 2.
  • the plurality of indoor units 3A and 3B are connected to each other in parallel via branching devices 6 between gas-side piping 4 and liquid-side piping 5 that are connected to the outdoor unit 2.
  • branching devices 6 between gas-side piping 4 and liquid-side piping 5 that are connected to the outdoor unit 2.
  • the plurality of indoor units are two, but the number of indoor units is not particularly limited as long as the number of indoor units is a plurality.
  • indoor units are referred to as indoor units 3 unless otherwise specified.
  • the outdoor unit 2 includes an inverter-driven compressor 10 configured to compress a refrigerant, a four-way selector valve 12 configured to switch the refrigerant circulation direction, an outdoor heat exchanger 13 configured to exchange heat between the refrigerant and outside air, a supercooling coil 14 integrally configured with the outdoor heat exchanger 13, an outdoor expansion valve (EEVH) 15, a receiver 16 that stores a liquid refrigerant, a supercooling heat exchanger 17 configured to supercool the liquid refrigerant, an supercooling expansion valve (EEVSC) 18 that controls the refrigerant amount diverted to the supercooling heat exchanger 17, an accumulator 19 that separates the liquid from a refrigerant gas which is sucked into the compressor 10 and cause only a gas portion to be taken into the compressor 10, a gas-side operation valve 20, and a liquid-side operation valve 21.
  • an inverter-driven compressor 10 configured to compress a refrigerant
  • a four-way selector valve 12 configured to switch the refrigerant circulation direction
  • Each of the above-described devices on the outdoor unit 2 side is sequentially connected via refrigerant piping 22, and constitutes an outdoor refrigerant circuit 23 that is known. Further, an outdoor fan 24 configured to blow the outside air to the outdoor heat exchanger 13 is disposed in the outdoor unit 2.
  • the gas-side piping 4 and the liquid-side piping 5 are refrigerant piping connected to the gas-side operation valve 20 and the liquid-side operation valve 21 of the outdoor unit 2, and lengths of the gas-side piping 4 and the liquid-side piping 5 are appropriately set according to a distance between the outdoor unit 2 and the plurality of indoor units 3A and 3B connected to the outdoor unit 2 at the time of installation in the field.
  • a plurality of the branching devices 6 are provided midway on the gas-side piping 4 and the liquid-side piping 5, and an appropriate number of the indoor units 3A and 3B are connected via the branching devices 6.
  • a refrigerating cycle (refrigerant circuit) 7 of one closed system is configured.
  • the indoor units 3A and 3B each includes an indoor heat exchanger 30 that causes inside air to exchange heat with the refrigerant for cooling or heating and provide the inside air for an indoor air conditioning, an indoor expansion valve (EEVC) 31, an indoor fan 32 that causes the inside air to circulate via the indoor heat exchanger 30, and an indoor controller 39, wherein the indoor units 3A and 3B are connected to the branching devices 6 via branched gas-side piping 4A, 4B and branched liquid-side piping 5A, 5B on the indoor side.
  • EEVC indoor expansion valve
  • the indoor units 3A and 3B each includes a first heat exchange temperature sensor (inlet side temperature sensor during heating) 33, a second heat exchange temperature sensor (outlet side temperature sensor during heating) 35, a third heat exchange temperature sensor (temperature sensor at a bend part) 34, and a suction temperature sensor 36.
  • the first heat exchange temperature sensor 33 is disposed on an inlet side of the refrigerant during heating operation of the indoor heat exchanger 30 for the indoor units 3A and 3B.
  • the first heat exchange temperature sensor 33 detects the temperature of the refrigerant flowing into the indoor heat exchanger 30 functioning as a condenser.
  • the second heat exchange temperature sensor 35 is disposed on the outlet side of the refrigerant during heating operation of the indoor heat exchanger 30 for the indoor units 3A and 3B.
  • the second heat exchange temperature sensor 35 detects the temperature of the refrigerant that flows out from the indoor heat exchanger 30 functioning as a condenser.
  • the third heat exchange temperature sensor 34 is disposed between the inlet side and the outlet side of the indoor heat exchanger 30, for example, in an intermediate part between the inlet side and the outlet side where cooling and heating is curved (bend part).
  • the third heat exchange temperature sensor 34 detects the temperature of the refrigerant between the inlet side and the outlet side of the indoor heat exchanger 30.
  • the suction temperature sensor 36 detects the temperature of a suction air sucked from a room in which air conditioning is to be performed by the indoor units 3A and 3B.
  • Information of each temperature detected by the first heat exchange temperature sensor 33, the second heat exchange temperature sensor 35, the third heat exchange temperature sensor 34, and the suction temperature sensor 36, is output to the control device 40 (details will be described later) via the indoor controller 39 corresponding to the indoor units 3A and 3B.
  • the cooling operation is performed as described below.
  • the flow of refrigerant during cooling operation is indicated by a solid arrow in FIG. 1 .
  • High-temperature and high-pressure refrigerant gas which is compressed and discharged by the compressor 10, is circulated toward the outdoor heat exchanger 13 by the four-way selector valve 12, and subjected to heat exchange with the outside air blown by the outdoor fan 24 to be condensed and liquefied in the outdoor heat exchanger 13. After further cooling by the supercooling coil 14, the liquid refrigerant passes through the outdoor expansion valve 15 and is temporarily stored in the receiver 16.
  • the liquid refrigerant whose circulation amount has been adjusted in the receiver 16 is partially diverted from the liquid refrigerant piping in the process of flowing through the liquid refrigerant piping side via the supercooling heat exchanger 17, and is subjected to heat exchange with the refrigerant adiabatically expanded by the supercooling expansion valve 18 to impart a degree of supercooling.
  • This liquid refrigerant is introduced from the outdoor unit 2 to the liquid-side piping 5 via the liquid-side operation valve 21, and diverted to the branched liquid-side piping 5A, 5B of the indoor units 3A and 3B via the branching devices 6.
  • the liquid refrigerant diverted to the branched liquid-side piping 5A, 5B flows into the indoor units 3A and 3B, is adiabatically expanded by the indoor expansion valve 31 to form a gas-liquid two-phase flow, and is introduced into the indoor heat exchanger 30.
  • the indoor heat exchanger 30 heat is exchanged between the refrigerant and the inside air circulated by the indoor fan 32, thus the inside air is cooled and provided for indoor cooling.
  • the refrigerant is gasified, flows to the branching device 6 via the branched gas-side piping 4A, 4B, and merges with the refrigerant gas from other indoor units in the gas-side piping 4.
  • the refrigerant gas merged in the gas-side piping 4 is returned to the outdoor unit 2 again, through the gas-side operation valve 20 and the four way selector valve 12, merged with the refrigerant gas from the supercooling heat exchanger 17, and then introduced into the accumulator 19.
  • the liquid portion contained in the refrigerant gas is separated, and only the gas portion is suctioned into the compressor 10. This refrigerant is compressed in the compressor 10 again, and the cooling operation is performed by repeating the cycle described above.
  • the heating operation is performed as follows.
  • the flow of the refrigerant during heating operation is indicated by a dotted arrow in FIG. 1 .
  • the high-temperature and high-pressure refrigerant gas compressed and discharged by the compressor 10 is circulated to the gas-side operation valve 20 via the four-way selector valve 12.
  • This high-pressure gas refrigerant is led out from the outdoor unit 2 via the gas-side operation valve 20 and the gas-side piping 4, and introduced into the plurality of indoor units 3A and 3B via the branching devices 6 and the branched gas-side piping 4A, 4B on the indoor side.
  • the high-temperature and high-pressure refrigerant gas introduced into the indoor units 3A and 3B is subjected to heat exchange with the inside air circulated via the indoor fan 32 in the indoor heat exchanger 30, thus the inside air heated is blown into the room and used for heating.
  • the refrigerant condensed and liquefied by the indoor heat exchanger 30 flows to the branching device 6 via the indoor expansion valve 31 and the branched liquid-side piping 5A, 5B, is merged with the refrigerant from other indoor units, and is returned to the outdoor unit 2 via the liquid-side piping 5.
  • the opening degree of the indoor expansion valve 31 is controlled via the indoor controller 39 so that the refrigerant flow rate that flows into the indoor heat exchanger 30 functioning as a condenser becomes a control target value.
  • the refrigerant returned to the outdoor unit 2 flows to the supercooling heat exchanger 17 via the liquid-side operation valve 21, and after being subjected to supercooling as in the case of cooling, the refrigerant flows into the receiver 16 and is temporarily stored so that the circulation amount is adjusted.
  • This liquid refrigerant is supplied to the outdoor expansion valve 15 and adiabatically expanded, and then flows into the outdoor heat exchanger 13 via the supercooling coil 14.
  • the refrigerant In the outdoor heat exchanger 13, heat is exchanged between the refrigerant and the outside air blown from the outdoor fan 24, and the refrigerant absorbs the heat from the outside air and is evaporated and gasified.
  • This refrigerant passes through the four-way selector valve 12 from the outdoor heat exchanger 13, is merged with the refrigerant gas from the supercooling heat exchanger 17, and is then introduced into the accumulator 19.
  • the liquid portion contained in the refrigerant gas is separated, and only the gas portion is suctioned into the compressor 10 and once again compressed in the compressor 10.
  • the heating operation is performed by repeating the cycle described above.
  • the circulation amount of the refrigerant is adjusted by the control such as the refrigerant is temporarily stored in the receiver 16, however, sometimes adjustment of the refrigerant flow rate at the receiver 16 may not catch up, and the indoor units 3A and 3B may become deficient for heating capacity due to the excessive amount of the refrigerant flow rate.
  • control executed by a control device 10 according to the present embodiment for preventing excessive refrigerant flow rate during heating operation and preventing the deficiency of heating capacity, will be described.
  • the multi-split air conditioning system 1 includes a control device 40.
  • FIG. 2 is a block diagram illustrating an electrical configuration of the control device 40 for controlling the multi-split air conditioning system 1 according to the present embodiment.
  • the control device 40 includes, for example, a Central Processing Unit (CPU), a Random Access Memory (RAM), a Read Only Memory (ROM), a computer readable storage medium, and the like. Further, for example, a sequence of processing for performing various functions is stored on a storage medium or the like in the form of a program, and the various functions are performed by the CPU loading this program from the storage medium, storing the program into the RAM or the like, and executing information processing and calculation processing.
  • the program may be preinstalled in the ROM or other storage medium, may be provided in the form of being stored in a computer-readable storage medium, or may be distributed through wired or wireless communication means, or the like. Examples of the computer-readable storage medium include a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, and the like. Further, the control device 40 is included in the outdoor unit 2.
  • control device 40 includes a determination unit 41, a detection unit 42, and a control unit 43.
  • the determination unit 41 determines whether the refrigerant flow rate flowing through the refrigerant piping is not less than a required refrigerant flow rate in the indoor units 3A and 3B performing heating operation.
  • the necessary refrigerant amount of the multi-split air conditioning system 1 varies depending on cooling operation, heating operation, or air conditioning of the air conditioning space, the number of indoor units operating, and the like.
  • the determination unit 41 determines whether the refrigerant flow rate that flows through the indoor units 3A and 3B operating is not less than the required refrigerant flow rate.
  • the determination unit 41 determines whether a period, in which a first temperature difference between a set temperature for each of the indoor units 3A and 3B and an indoor temperature of the room in which air conditioning is to be performed by the indoor units 3A and 3B is not less than the first predetermined value, continues for a first predetermined period or longer, or determines whether a second temperature difference in the refrigerant piping between two points of an outlet and another point except the outlet in a section from the inlet to the outlet of the indoor heat exchanger 30 disposed in each of the indoor units 3A and 3B, is not greater than a second predetermined value.
  • the other point except the outlet may be, for example, a bend part that is an intermediate part between the outlet and the inlet, or an inlet part.
  • an indoor temperature sensor (not illustrated) for detecting an indoor temperature within a room in which air conditioning is to be performed is provided on the indoor units 3A and 3B side, and in a case where the indoor units 3A and 3B are disposed in a ceiling of a room with a high ceiling, even if it is determined that the indoor temperature and the set temperature have been reduced, sometimes the temperature difference between the indoor temperature in a space where a human or the like exists and the set temperature may be large. In this case, the temperature difference between, as the indoor temperature, an actual indoor temperature experienced by the human or the like and the indoor temperature detected on the indoor units 3A and 3B side becomes large.
  • an indoor temperature sensor that detects the indoor temperature of the room in which air conditioning is to be performed by the indoor units 3A and 3B, is disposed in a remote controller (not illustrated) that operates the indoor units 3A and 3B, thus the remote controller can detect the indoor temperature close to the indoor temperature experienced by a human or the like, and the difference between the set temperature and the indoor temperature can be determined with good accuracy.
  • the determination unit 41 is configured to determine "a case where a period in which a first temperature difference between a set temperature of the indoor units 3A and 3B and an indoor temperature is not less than a first predetermined value continues for a first predetermined value or longer", by limiting to the case where the indoor temperature sensor is disposed in the remote controller, thus the accuracy of determining whether the space in which air conditioning is to be performed is appropriately air conditioned can be improved.
  • the detection unit 42 detects that deficiency of heating capacity has occurred, and outputs to the control unit 43 that the deficiency of heating capacity has occurred.
  • control unit 43 In a case where the indoor units 3A and 3B having the deficiency of heating capacity is detected by the control unit 43, the control unit 43 fully closes (closes) the indoor expansion valve 31 of stopped indoor units that are the indoor units 3A and 3B not in operation.
  • the indoor units are two, one indoor unit is operating, and another one indoor unit is a stopped indoor unit, is given as an example, however, the present disclosure may be applied even if the indoor units are not less than three, and sometimes the stopped indoor units may be not less than two depending on an operating state of the multi-split air conditioning system 1.
  • the indoor units 3 in which indoor expansion valve 31 is fully closed may be some of the indoor units 3 or may be all of the indoor units 3.
  • a method of selecting the indoor units 3 to be closed is not particularly limited.
  • each of the stopped indoor units may be selected based on the address, such as selecting one stopped indoor unit that has a small number indicating the address among the stopped indoor units. Also, for example, one stopped indoor unit may be selected that has not been used for a certain period of time, for which the period in which the operation is stopped is not less than the second predetermined period, that is, one stopped indoor unit used frequently is avoided from being selected.
  • the indoor expansion valves 31 of the plurality of indoor units 3 may be closed together, or the indoor expansion valves 31 of the plurality of indoor units 3 may be closed sequentially (stepwise).
  • the control of selecting some of the indoor units 3 among the stopped indoor units may be performed manually by a user or may be controlled by the control device 40.
  • the supercooling refrigerant flow rate in the indoor units 3A and 3B performing operation it can be determined whether setting the indoor unit 3 in which the indoor expansion valve 31 is fully closed to be a part of the stopped indoor units 3 or all of the stopped indoor units 3, or how many indoor units 3 are to be selected in the case where the indoor unit 3 is set to be a part of the indoor units 3.
  • the indoor unit 3A performs heating operation and the indoor unit 3B is a stopped indoor unit that stops operation is described as an example, the present disclosure is not limited to this example.
  • the indoor unit 3A performs heating operation, and the indoor unit 3B is stopped from operating.
  • the opening degree of the indoor expansion valve 31 of the indoor unit 3B not in operation is adjusted to be slightly opened.
  • the refrigerant having a temperature about 40°C to 50°C flows into the inlet side of the refrigerant piping of the indoor heat exchanger 30 of the indoor unit 3A.
  • the temperature within the refrigerant piping (for example, the bend part) of the indoor heat exchanger 30 is close to the indoor temperature (suction temperature; for example, 20°C), thus, the refrigerant having a temperature about 40°C to 50°C, which has flowed into the inlet of the refrigerant piping, is lowered in temperature by the accumulated refrigerant and further accumulated in the refrigerant piping.
  • step SA1 in FIG. 3 deficiency of heating capacity is detected as the refrigerant flow rate is not greater than the necessary refrigerant amount in the indoor unit 3A (step SA2 in FIG. 3 ).
  • step SA1 in FIG. 3 the flow is returned to repeat the determination.
  • the indoor unit 3B which is a stopped indoor unit, and is stored in the indoor unit 3B.
  • the control device 40 the multi-split air conditioning system 1 provided with the control device 40, and the control method and control program according to the present embodiment, in a case where deficiency of heating capacity is detected in the indoor units 3A and 3B performing heating operation, by fully closing the indoor expansion valves 31 of the stopped indoor unit which are the indoor units 3A and 3B not in operation, a part of the refrigerant flowing through the refrigerant piping of the indoor units 3A and 3B performing heating operation is stored on the stopped indoor unit side.
  • the refrigerant flow rate of the indoor units 3A and 3B performing heating operation can be reduced, and even if deficiency of heating capacity occurs due to the excessive refrigerant flow rate, the deficiency of heating capacity can be improved.
  • the existing multi-split air conditioning system 1 can be redundant.
  • heating operation it is possible to determine whether the room in which air conditioning is to be performed is not sufficiently warm, whether the refrigerant is accumulated in the indoor unit, or the like, and the deficiency of heating capacity has occurred can be detected.
  • the present disclosure is not limited to this.
  • the indoor temperature (intake temperature) of the indoor units 3 is close to the temperature of the refrigerant accumulated in the refrigerant piping, and the difference between the indoor temperature and the bend part or inlet temperature may be compared to detect deficiency of heating capacity.
  • the temperature sensor (the first heat exchange temperature sensor 33) disposed in the refrigerant piping can be reduced.
  • liquid refrigerant tends to be accumulated and a false detection may be caused at the outlet side of the refrigerant piping, thus, it is preferred not to use the outlet temperature to compare with the indoor temperature.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
EP18809354.6A 2017-05-31 2018-04-18 Dispositif de commande, système de climatisation à unités multiples équipé de celui-ci, procédé de commande et programme de commande Withdrawn EP3543618A1 (fr)

Applications Claiming Priority (2)

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JP2017107632A JP2018204814A (ja) 2017-05-31 2017-05-31 制御装置、それを備えたマルチ型空気調和システム、及び制御方法並びに制御プログラム
PCT/JP2018/016020 WO2018221052A1 (fr) 2017-05-31 2018-04-18 Dispositif de commande, système de climatisation à unités multiples équipé de celui-ci, procédé de commande et programme de commande

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EP4269897A4 (fr) * 2020-12-28 2024-03-06 Mitsubishi Electric Corp Climatiseur et unité intérieure

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CN110567048B (zh) * 2019-09-27 2021-06-01 海信（山东）空调有限公司 多联机制热运行中电子膨胀阀控制方法和装置
CN112710065B (zh) * 2019-10-24 2023-03-07 广东美的制冷设备有限公司 一拖多空调器的控制方法、一拖多空调器及存储介质
CN113551369B (zh) * 2021-07-09 2022-04-26 珠海格力电器股份有限公司 一种用于检测制冷系统堵塞的控制系统及堵塞检测方法

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* Cited by examiner, † Cited by third party
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EP4269897A4 (fr) * 2020-12-28 2024-03-06 Mitsubishi Electric Corp Climatiseur et unité intérieure

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