WO2022054584A1 - 空気調和装置 - Google Patents
空気調和装置 Download PDFInfo
- Publication number
- WO2022054584A1 WO2022054584A1 PCT/JP2021/031243 JP2021031243W WO2022054584A1 WO 2022054584 A1 WO2022054584 A1 WO 2022054584A1 JP 2021031243 W JP2021031243 W JP 2021031243W WO 2022054584 A1 WO2022054584 A1 WO 2022054584A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- indoor
- heat exchanger
- refrigerant
- supercooling
- compressor
- Prior art date
Links
Images
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
- F24F11/70—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
- 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
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
-
- 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
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2509—Economiser 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
Definitions
- An embodiment of the present invention relates to an air conditioner in which an outdoor unit and a plurality of indoor units are connected.
- Patent Document 1 discloses a technique for storing excess refrigerant in an accumulator of an operating outdoor unit and an accumulator of a stopped outdoor unit as a method of storing liquid in an accumulator when excess refrigerant is detected. ing.
- the refrigerant stored in the accumulator of the outdoor unit during operation may be discharged immediately even if it is stored. Further, the refrigerant stored in the accumulator of the stopped outdoor unit may not be recovered until the stopped outdoor unit is restarted. Therefore, when the operating state of the air conditioner changes and the appropriate amount of refrigerant is changed, the stop outdoor unit is restarted to solve the problem of insufficient amount of refrigerant, deterioration of heating performance due to excessive amount of refrigerant, and elimination of insufficient amount of refrigerant. There is a risk of problems such as unnecessary power consumption associated with operation.
- An embodiment of the present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an air conditioner capable of optimizing the amount of refrigerant in a refrigerant circuit during heating operation and ensuring good heating performance. ..
- an outdoor unit provided with a compressor, an outdoor heat exchanger, an accumulator and a supercooling heat exchanger, and a plurality of indoor units equipped with an indoor heat exchanger are connected by a connecting pipe.
- the accumulator is connected to the suction side of the compressor, and the bottom of the accumulator is connected via a return bypass pipe provided with a valve mechanism.
- the outdoor heat exchanger and the supercooling heat exchanger are sequentially connected to the suction side of the compressor and the discharge side of the compressor, and the cooling source of the supercooling heat exchanger is an expansion mechanism for supercooling.
- this overcooling bypass circuit expands the refrigerant on the downstream side of the outdoor heat exchanger by the overcooling expansion mechanism and guides it to the overcooling heat exchanger, and then to the accumulator.
- the control unit determines that the amount of refrigerant in the refrigerant circuit is excessive during the heating operation, the control unit fully closes the valve mechanism of the return bypass pipe and the overcooling pipe pass circuit. It is characterized in that the opening degree of the overcooling expansion mechanism is controlled so as to gradually open from a fully closed state.
- the amount of refrigerant in the refrigerant circuit can be optimized during the heating operation to ensure good heating performance.
- the system diagram which shows the structure of the air conditioner which concerns on one Embodiment.
- the block diagram which shows the control part in the air conditioner of FIG.
- the flowchart which shows the determination and control when the amount of a refrigerant is excessive at the time of heating operation of the air conditioner of FIG.
- the outdoor unit 11 and a plurality of indoor units 12 are connected by a liquid refrigerant connecting pipe 13 and a gas refrigerant connecting pipe 14 as connecting pipes to form a refrigerant circuit 15. It also has a control unit 16 (FIG. 2).
- the outdoor unit 11 has an outdoor refrigerant circuit 15A that constitutes a part of the refrigerant circuit 15.
- the outdoor refrigerant circuit 15A includes a compressor 18, a four-way valve 19, an outdoor heat exchanger 20, an outdoor expansion valve 21 as an outdoor expansion mechanism, an outdoor fan 22, an accumulator 23, an overcooling heat exchanger 24, and a liquid-side packed valve. 25 and a gas side packed valve 26 are provided.
- the compressor 18 is a compressor with a variable operating capacity, and is driven by a motor whose rotation speed is controlled by an inverter 46 described later.
- the four-way valve 19 is a valve for switching the flow of the refrigerant, and the outdoor heat exchanger 20 serves as a condenser and the indoor heat exchanger 40 (described later) functions as an evaporator during the cooling operation.
- the four-way valve 19 connects the discharge side of the compressor 18 and the gas side of the outdoor heat exchanger 20 and the suction side of the compressor 18 (that is, the accumulator 23) during the cooling operation.
- the gas side packed valve 26 that is, the gas refrigerant connecting pipe 14
- the four-way valve 19 makes the indoor heat exchanger 40 function as a condenser and the outdoor heat exchanger 20 functions as an evaporator during the heating operation.
- the four-way valve 19 connects the discharge side of the compressor 18 and the gas side packed valve 26 (that is, the gas refrigerant connecting pipe 14) and sucks the compressor 18 as shown by the broken line in FIG.
- the side is connected to the gas side of the outdoor heat exchanger 20.
- the outdoor heat exchanger 20 is composed of a heat transfer tube and a large number of fins, and functions as a condenser during the cooling operation and as an evaporator during the heating operation as described above.
- the outdoor heat exchanger 20 is connected to the four-way valve 19 on the gas side and to the liquid side packed valve 25 (that is, the liquid refrigerant connecting pipe 13) on the liquid side.
- the outdoor expansion valve 21 adjusts the amount of refrigerant flowing into the outdoor heat exchanger 20 in order to adjust the pressure and flow rate of the refrigerant flowing in the outdoor refrigerant circuit 15A, and is located on the liquid side of the outdoor heat exchanger 20. Be connected.
- the outdoor expansion valve 21 is preferably an electronic expansion valve whose valve opening degree can be easily adjusted.
- the outdoor fan 22 sucks the outside air into the outdoor unit 11, exchanges heat with the refrigerant in the outdoor heat exchanger 20, and then discharges the outside air to the outside of the outdoor unit 11.
- the outdoor fan 22 is a fan capable of changing the air volume of the outside air supplied to the outdoor heat exchanger 20.
- the accumulator 23 is connected between the four-way valve 19 and the compressor 18 on the suction side of the compressor 18, and is a container for storing excess refrigerant generated in the refrigerant circuit 15.
- the accumulator 23 separates the liquid refrigerant and the gas refrigerant, and causes only the gas refrigerant to be sucked into the compressor 18.
- the bottom of the accumulator 23 is connected to the suction side of the compressor 18 via a return bypass pipe 27 provided with a solenoid valve 28 as a valve mechanism.
- the mixed liquid of the refrigerant and the oil stored in the bottom of the accumulator 23 is sucked into the compressor 18 through the return bypass pipe 27, and the flow of the mixed liquid is controlled by opening and closing the solenoid valve 28.
- a four-way valve 19 an outdoor heat exchanger 20, an outdoor expansion valve 21, and a supercooling heat exchanger 24 are sequentially connected to the discharge side of the compressor 18.
- the supercooling heat exchanger 24 cools the condensed refrigerant in the outdoor heat exchanger 20, and the cooling source of the supercooling heat exchanger 24 is the supercooling bypass circuit 30.
- the supercooling bypass circuit 30 includes a supercooling expansion valve 31 as a supercooling expansion mechanism. Then, the overcooling bypass circuit 30 transfers a part of the refrigerant flowing from the outdoor heat exchanger 20 to the indoor expansion valve 41 via the overcooling heat exchanger 24, for example, on the downstream side of the outdoor heat exchanger 20.
- the flow is split on the downstream side of 24, expanded by the overcooling expansion valve 31, and depressurized, and the decompressed refrigerant is guided to the supercooling heat exchanger 24 and then to the accumulator 23.
- the refrigerant flowing from the outdoor heat exchanger 20 toward the indoor expansion valve 41 of the indoor unit 12 in the overcooling heat exchanger 24 flows through the overcooling bypass circuit 30 and is decompressed by the overcooling expansion valve 31 to exchange overcooling heat. It is cooled by heat exchange by the refrigerant guided to the vessel 24.
- the liquid side packed valve 25 is a valve provided at the connection port with the liquid refrigerant connecting pipe 13 which is an external pipe of the outdoor unit 11, and is connected to the supercooling heat exchanger 24.
- the gas side packed valve 26 is a valve provided at a connection port with the gas refrigerant connecting pipe 14 which is an external pipe of the outdoor unit 11, and is connected to the four-way valve 19.
- a discharge pressure sensor 32 for measuring the discharge pressure PD and a discharge temperature sensor 34 for measuring the discharge temperature TD are provided, respectively.
- an suction pressure sensor 33 for measuring the suction pressure PS and a suction temperature sensor 35 for measuring the suction temperature TS1 are provided upstream of the accumulator 23 on the suction side of the compressor 18.
- a liquid side temperature sensor 36 for measuring the liquid refrigerant temperature TL1 flowing in and out of the outdoor heat exchanger 20 is provided on the liquid side of the outdoor heat exchanger 20. Further, the supercooling bypass circuit 30 is provided with a supercooling bypass temperature sensor 37 that measures the refrigerant temperature TS2 on the outlet side of the supercooling heat exchanger 24. Further, a liquid pipe temperature sensor 38 for measuring the liquid pipe temperature TL2 is provided between the supercooled heat exchanger 24 and the liquid side packed valve 25. Further, an outside air temperature sensor 39 for measuring the outside air temperature TG is provided on the intake side of the outside air in the outdoor heat exchanger 20.
- Each of the plurality of indoor units 12 has an indoor refrigerant circuit 15B that constitutes a part of the refrigerant circuit 15.
- the indoor refrigerant circuit 15B includes an indoor heat exchanger 40, an indoor expansion valve 41 as an indoor expansion mechanism, and an indoor fan 42.
- the indoor heat exchanger 40 is a heat exchanger composed of a heat transfer tube and a large number of fins, and functions as an evaporator during cooling operation to cool the indoor air, and functions as a condenser during heating operation to provide indoor air. Heat.
- the indoor expansion valve 41 adjusts the amount of refrigerant flowing into the indoor heat exchanger 40 in order to adjust the flow rate of the refrigerant flowing in the indoor refrigerant circuit 15B, and is connected to the liquid side of the indoor heat exchanger 40. Will be done.
- the adjustment of the amount of refrigerant flowing into the indoor heat exchanger 40 by the indoor expansion valve 41 controls the opening degree of the indoor expansion valve 41 based on the difference between the indoor supercooling degree SC and the target indoor supercooling degree SCO, which will be described later. It is done by doing.
- the indoor expansion valve 41 is preferably an electronic expansion valve whose valve opening degree can be easily adjusted.
- the indoor fan 42 sucks indoor air into the indoor unit 12, exchanges heat with the refrigerant in the indoor heat exchanger 40, and then supplies the intake air to the room. Further, the indoor unit 12 is provided with various sensors.
- an indoor gas side temperature sensor 43 for measuring the gas refrigerant temperature TC1 of the indoor heat exchanger 40 is provided on the gas side of the indoor heat exchanger 40.
- an indoor liquid side temperature sensor 44 for measuring the liquid refrigerant temperature TC2 of the indoor heat exchanger 40 is provided on the suction side of the indoor air in the indoor heat exchanger 40.
- an indoor air temperature sensor 45 for measuring the temperature (indoor air temperature) TA of the indoor air flowing into the indoor unit 12 is provided.
- the compressor 18, the four-way valve 19, the outdoor heat exchanger 20, the outdoor expansion valve 21, the overcooling heat exchanger 24 of the outdoor unit 11, the indoor expansion valve 41 of the indoor unit 12, and the indoor unit 12 The indoor heat exchanger 40 and the accumulator 23 of the outdoor unit 11 are sequentially connected by a refrigerant pipe to form a refrigeration cycle.
- the outdoor unit 11 has an outdoor control unit 16A (FIG. 2) that controls the operation of each unit constituting the outdoor unit 11, and the indoor unit 12 controls the operation of each unit constituting the indoor unit 12. It has a portion 16B (FIG. 2).
- the outdoor control unit 16A transmits a command signal to the inverter 46 that frequency-controls the operation of the compressor 18.
- the inverter 46 rectifies the voltage of the commercial AC power supply 47, converts the rectified voltage into a frequency corresponding to the DC signal from the outdoor control unit 16A, outputs the voltage to the motor of the compressor 18, and outputs the rectified voltage to the motor of the compressor 18. Frequency control of capacitance.
- the outdoor control unit 16A of the outdoor unit 11 transmits and receives control signals and the like via the transmission line 48 and the indoor control units 16B of each of the plurality of indoor units 12. That is, the outdoor control unit 16A and the indoor control unit 16B constitute a control unit 16 that controls the operation of the entire air conditioner 10.
- the control unit 16 receives the measurement signals of the pressure sensors 32 and 33 and various temperature sensors 35 to 39 and 43 to 45, and based on these measurement signals, the compressor 18, the four-way valve 19, and the outdoor expansion valve. 21. Controls the outdoor fan 22, the solenoid valve 28, the overcooling expansion valve 31, the indoor expansion valve 41, the indoor fan 42, and the like. As a result, the control unit 16 performs the cooling operation, the heating operation, the excess refrigerant control operation, and the like of the air conditioning device 10 described below.
- (A) Cooling operation During the cooling operation, the four-way valve 19 is in the state shown by the solid line in FIG. 1, that is, the discharge side of the compressor 18 is connected to the gas side of the outdoor heat exchanger 20, and the suction side of the compressor 18 is. It is controlled by the control unit 16 so as to be connected to the gas side of the indoor heat exchanger 40 via the gas side packed valve 26 and the gas refrigerant connecting pipe 14.
- the high-pressure liquid refrigerant that has been supercooled by the supercooled heat exchanger 24 is sent to the indoor unit 12 via the liquid refrigerant connecting pipe 13.
- the high-pressure liquid refrigerant sent to the indoor unit 12 is depressurized to near the suction pressure of the compressor 18 by the indoor expansion valve 41, becomes a low-pressure gas-liquid two-phase state refrigerant, and is sent to the indoor heat exchanger 40.
- this indoor heat exchanger 40 heat is exchanged with the indoor air to cool the indoor air and evaporate to become a low-pressure gas refrigerant.
- This low-pressure gas refrigerant is sent to the outdoor unit 11 via the gas refrigerant connecting pipe 14, and flows into the accumulator 23 via the four-way valve 19.
- the low-pressure gas refrigerant flowing into the accumulator 23 is sucked into the compressor 18 again.
- (B) Heating operation During the heating operation, the four-way valve 19 is in the state shown by the broken line in FIG. 1, that is, the discharge side of the compressor 18 is the indoor heat exchanger 40 via the gas side packed valve 26 and the gas refrigerant connecting pipe 14.
- the control unit 16 controls the state in which the suction side of the compressor 18 is connected to the gas side of the outdoor heat exchanger 20 and is connected to the gas side of the outdoor heat exchanger 20.
- the high-pressure gas refrigerant sent to the indoor unit 12 exchanges heat with the indoor air in the indoor heat exchanger 40 to heat and condense the indoor air to become a high-pressure liquid refrigerant, and then the indoor expansion valve.
- the pressure is reduced according to the valve opening degree of the indoor expansion valve 41.
- the refrigerant that has passed through the indoor expansion valve 41 is sent to the outdoor unit 11 via the liquid refrigerant connecting pipe 13, and is further depressurized via the supercooling heat exchanger 24 and the outdoor expansion valve 21, and then the outdoor heat is generated. It flows into the exchanger 20.
- the low-pressure gas-liquid two-phase refrigerant flowing into the outdoor heat exchanger 20 exchanges heat with the outside air supplied by the outdoor fan 22 and evaporates to become a low-pressure gas refrigerant, which is passed through the four-way valve 19. It flows into the accumulator 23.
- the low-pressure gas refrigerant flowing into the accumulator 23 is sucked into the compressor 18 again.
- the control unit 16 first converts and obtains the condensation temperature from the discharge pressure PD measured by the discharge pressure sensor 32 during the heating operation of the air conditioner 10. Next, the control unit 16 obtains the indoor supercooling degree SC from the difference between the liquid refrigerant temperature TC2 measured by the indoor liquid side temperature sensor 44 during the heating operation of the air conditioner 10 and the above-mentioned condensation temperature. Then, the control unit 16 determines whether or not the amount of the refrigerant in the refrigerant circuit 15 is excessive during the heating operation of the air conditioner 10 as described above, and the indoor supercooling degree SC is actually detected. At least one of the opening degree PLS of the expansion valve 41 is determined as a determination index.
- the control unit 16 detects the opening degree PLS of the indoor expansion valve 41 after the air conditioner 10 is heated (S1). Next, the control unit 16 determines whether or not the opening degree PLS of the indoor expansion valve 41 is larger than the predetermined opening degree A (S3). When the opening degree PLS of the indoor expansion valve 41 is equal to or less than the predetermined opening degree A, the control unit 16 continues the current operating state (S4).
- the control unit 16 calculates the indoor supercooling degree SC from the discharge pressure PD of the compressor 18 and the liquid refrigerant temperature TC2 of the indoor heat exchanger 40. (S5). Next, the control unit 16 determines whether or not the difference between the indoor supercooling degree SC (actual indoor supercooling degree SC) detected in step S5 and the target indoor supercooling degree SCO is larger than the predetermined value B. (S6).
- the control unit 16 continues the current operating state when the difference between the indoor supercooling degree SC detected in step S6 and the target indoor supercooling degree SCO is a predetermined value B or less (S4).
- the control unit 16 performs a liquid storage operation in the accumulator 23 described later and the accumulator 23.
- the solenoid valve 28 in the bottom return bypass pipe 27 is closed (S7).
- step S3 there are two determinations in step S3 (PLS> A) and step S6 (actual SC-target SCO> B) that the amount of refrigerant in the refrigerant circuit 15 is excessive during the heating operation of the air conditioner 10. Not only when both conditions are satisfied, only (PLS> A) in step S3 continues for a certain period of time, or only (actual SC-target SCO> B) in step S6 continues for a certain period of time or longer. It is also carried out when it is.
- the bottom of the accumulator 23 is as shown in step S7 of FIG.
- the electromagnetic valve 28 of the return bypass pipe 27 that connects the compressor 18 and the suction side of the compressor 18 is fully closed (closed), and the overcooling bypass circuit 30 that is the cooling source of the overcooling heat exchanger 24 is expanded for overcooling.
- the opening PLS of the valve 31 is gradually opened from the fully closed state to store excess refrigerant in the accumulator 23.
- the opening PLS of the supercooling expansion valve 31 of the supercooling bypass circuit 30 is gradually opened from the fully closed state to open the refrigerant.
- the excess refrigerant in the circuit 15 can be stored in the accumulator 23. Further, by fully closing the solenoid valve 28 of the return bypass pipe 27, the refrigerant stored in the accumulator 23 can be retained in the accumulator 23 for a long time.
Landscapes
- 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)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
図1に示す空気調和装置10は、室外ユニット11と複数台の室内ユニット12とが、連結配管としての液冷媒連絡配管13及びガス冷媒連絡配管14により接続されて冷媒回路15を構成するものであり、更に制御部16(図2)を有する。
冷房運転時には、四方弁19が図1の実線に示される状態、つまり、圧縮機18の吐出側が室外熱交換器20のガス側に接続され、且つ圧縮機18の吸入側が、ガス側パックドバルブ26及びガス冷媒連絡配管14を介して室内熱交換器40のガス側に接続される状態に、制御部16により制御される。
暖房運転時には、四方弁19が図1の破線に示された状態、つまり圧縮機18の吐出側が、ガス側パックドバルブ26及びガス冷媒連絡配管14を介して室内熱交換器40のガス側に接続され、且つ圧縮機18の吸入側が室外熱交換器20のガス側に接続される状態に、制御部16により制御される。
複数台の室内ユニット12を有するマルチタイプの空気調和装置10では、冷房運転を基準にして冷媒回路15内に封入する冷媒量を決定した場合、室外熱交換器20の容量に対して室内熱交換器40の容量が小さくなるような接続条件では、暖房運転時に冷媒回路15内の冷媒量が過剰になる場合がある。このように暖房運転時に冷媒量が過剰になると、圧縮機18の吐出圧力の上昇や、室内ユニット12の室内過冷却度の増大により暖房性能が低下してしまう恐れがある。
空気調和装置10の暖房運転時に冷媒回路15内の冷媒が過剰であるとき、過冷却バイパス回路30の過冷却用膨張弁31の開度PLSを全閉状態から徐々に開動作させることで、冷媒回路15内の過剰な冷媒をアキュムレータ23に貯溜することができる。更に、戻しバイパス配管27の電磁弁28を全閉動作させることで、アキュムレータ23に貯溜された冷媒をアキュムレータ23内に長時間留めることができる。これらのことから、圧縮機18の吐出側の吐出圧力PDと室内ユニット12の室内過冷却度SCを共に適正状態に維持できるので、室内熱交換器40の凝縮性能の低下を防止して、空気調和装置10の暖房性能を良好に確保できる。
Claims (2)
- 圧縮機、室外熱交換器、アキュムレータ及び過冷却熱交換器を備えた室外ユニットと、室内熱交換器を備えた複数台の室内ユニットとが連結配管により接続されて冷媒回路を構成すると共に、制御部を有する空気調和装置において、
前記アキュムレータは前記圧縮機の吸入側に接続され、このアキュムレータの底部が、弁機構を備えた戻しバイパス配管を介して前記圧縮機の吸入側に接続され、
前記圧縮機の吐出側に前記室外熱交換器及び前記過冷却熱交換器が順次接続され、前記過冷却熱交換器の冷却源が、過冷却用膨張機構を備えた過冷却バイパス回路であり、この過冷却バイパス回路は、前記室外熱交換器の下流側の冷媒を前記過冷却用膨張機構により膨張させて前記過冷却熱交換器へ導いた後に前記アキュムレータへ導くものであり、
前記制御部は、暖房運転時に前記冷媒回路内の冷媒量が過剰であると判断したときに、前記戻しバイパス配管の前記弁機構を全閉動作させ、且つ前記過冷却バイパス回路の前記過冷却用膨張機構の開度を全閉状態から徐々に開動作させるよう制御することを特徴とする空気調和装置。 - 前記室外ユニットは、前記圧縮機の吐出側に吐出圧力を測定する吐出圧力センサを備え、前記室内ユニットは、前記室内熱交換器の液冷媒温度を測定する室内液側温度センサと、前記室内熱交換器に流入する冷媒量を調整する室内膨張機構とを備え、
前記制御部は、暖房運転時に前記吐出圧力センサにより測定された前記吐出圧力から凝縮温度を求め、この凝縮温度と、暖房運転中に前記室内液側温度センサにより測定された前記室内熱交換器の前記液冷媒温度との差から室内過冷却度を求め、暖房運転時に冷媒回路内の冷媒量が過剰であるか否かを、前記室内過冷却度と前記室内膨張機構の開度との少なくとも一方を判断指標として判断するよう構成されたことを特徴とする請求項1に記載の空気調和装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21866544.6A EP4212798A1 (en) | 2020-09-14 | 2021-08-25 | Air conditioning apparatus |
US18/245,090 US20230358432A1 (en) | 2020-09-14 | 2021-08-25 | Air conditioner |
CN202180061746.1A CN116075675A (zh) | 2020-09-14 | 2021-08-25 | 空调装置 |
JP2022547487A JP7332817B2 (ja) | 2020-09-14 | 2021-08-25 | 空気調和装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020154116 | 2020-09-14 | ||
JP2020-154116 | 2020-09-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022054584A1 true WO2022054584A1 (ja) | 2022-03-17 |
Family
ID=80632345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/031243 WO2022054584A1 (ja) | 2020-09-14 | 2021-08-25 | 空気調和装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20230358432A1 (ja) |
EP (1) | EP4212798A1 (ja) |
JP (1) | JP7332817B2 (ja) |
CN (1) | CN116075675A (ja) |
WO (1) | WO2022054584A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007218558A (ja) | 2006-02-20 | 2007-08-30 | Daikin Ind Ltd | 空気調和装置および熱源ユニット |
WO2013160967A1 (ja) * | 2012-04-27 | 2013-10-31 | 三菱電機株式会社 | 空気調和装置 |
JP2020085269A (ja) * | 2018-11-16 | 2020-06-04 | パナソニックIpマネジメント株式会社 | 冷凍サイクル装置 |
-
2021
- 2021-08-25 WO PCT/JP2021/031243 patent/WO2022054584A1/ja active Application Filing
- 2021-08-25 EP EP21866544.6A patent/EP4212798A1/en active Pending
- 2021-08-25 JP JP2022547487A patent/JP7332817B2/ja active Active
- 2021-08-25 US US18/245,090 patent/US20230358432A1/en active Pending
- 2021-08-25 CN CN202180061746.1A patent/CN116075675A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007218558A (ja) | 2006-02-20 | 2007-08-30 | Daikin Ind Ltd | 空気調和装置および熱源ユニット |
WO2013160967A1 (ja) * | 2012-04-27 | 2013-10-31 | 三菱電機株式会社 | 空気調和装置 |
JP2020085269A (ja) * | 2018-11-16 | 2020-06-04 | パナソニックIpマネジメント株式会社 | 冷凍サイクル装置 |
Also Published As
Publication number | Publication date |
---|---|
EP4212798A1 (en) | 2023-07-19 |
JPWO2022054584A1 (ja) | 2022-03-17 |
JP7332817B2 (ja) | 2023-08-23 |
CN116075675A (zh) | 2023-05-05 |
US20230358432A1 (en) | 2023-11-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10323862B2 (en) | Air conditioning unit having dynamic target condensing and evaporating values based on load requirements | |
EP2339256B1 (en) | Air conditioner and method for controlling the same | |
US9151522B2 (en) | Air conditioner and control method thereof | |
US10941964B2 (en) | Method for operating a vapour compression system with a receiver | |
US10955160B2 (en) | Air conditioner including a plurality of utilization units connected in parallel to a heat source unit | |
US11187447B2 (en) | Refrigeration cycle apparatus | |
JP2006300371A (ja) | 空気調和機 | |
JP2007232265A (ja) | 冷凍装置 | |
US8769968B2 (en) | Refrigerant system and method for controlling the same | |
JP2006300373A (ja) | 空気調和機 | |
KR100845847B1 (ko) | 공기조화기의 제어방법 | |
JP5056794B2 (ja) | 空気調和装置 | |
WO2022054584A1 (ja) | 空気調和装置 | |
CN114151935A (zh) | 一种空调系统 | |
WO2017094172A1 (ja) | 空気調和装置 | |
WO2021010130A1 (ja) | 冷凍装置 | |
JP3835478B1 (ja) | 空気調和機 | |
WO2016207992A1 (ja) | 空気調和機 | |
US20240027116A1 (en) | Heat source unit and refrigeration apparatus | |
JP7284381B2 (ja) | 冷凍装置 | |
JP6835116B2 (ja) | 冷凍装置 | |
US11976857B2 (en) | Refrigeration cycle device | |
JP2017141987A (ja) | 冷凍サイクル装置 | |
JP2023092357A (ja) | 熱源ユニット及び冷凍装置 | |
CN117433075A (zh) | 混合多联空调系统 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21866544 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2022547487 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2021866544 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2021866544 Country of ref document: EP Effective date: 20230414 |