WO2019087405A1 - Dispositif de conditionnement d'air - Google Patents

Dispositif de conditionnement d'air Download PDF

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Publication number
WO2019087405A1
WO2019087405A1 PCT/JP2017/039995 JP2017039995W WO2019087405A1 WO 2019087405 A1 WO2019087405 A1 WO 2019087405A1 JP 2017039995 W JP2017039995 W JP 2017039995W WO 2019087405 A1 WO2019087405 A1 WO 2019087405A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
refrigerant
degree
condenser
outdoor heat
Prior art date
Application number
PCT/JP2017/039995
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English (en)
Japanese (ja)
Inventor
鈴木　秀一
松岡　慎也
Original Assignee
ダイキン工業株式会社
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Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to PCT/JP2017/039995 priority Critical patent/WO2019087405A1/fr
Publication of WO2019087405A1 publication Critical patent/WO2019087405A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—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
    • 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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle

Definitions

  • the present invention relates to an air conditioner.
  • Patent Document 1 Japanese Patent Laid-Open No. 2015-124958 describes an air conditioner that reduces the fan rotational speed of the indoor unit when the low pressure exceeds the upper limit during cooling operation under high outside air. ing.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2015-124958
  • An object of the present disclosure is to release the refrigerant liquid accumulated in the condenser from the condenser.
  • An air conditioner includes: a refrigerant circuit to which a compressor, a condenser, an expansion valve, and an evaporator are connected, and a control device that controls the opening degree of the expansion valve.
  • the control device increases the opening degree of the expansion valve when it is determined that the refrigerant liquid is accumulated in the condenser.
  • the refrigerant liquid accumulated in the condenser can be released from the condenser.
  • control device determines that the refrigerant is stagnating in the condenser when the degree of subcooling of the outlet of the condenser is equal to or greater than a first predetermined value. Increase the degree of opening.
  • the control device when the control device is configured such that the condensing temperature of the condenser is equal to or higher than the first temperature and the degree of subcooling of the outlet of the condenser is equal to or higher than a first predetermined value, It is determined that the refrigerant is stagnating in the condenser, and the opening degree of the expansion valve is increased.
  • the refrigerant liquid remaining in the condenser can be released from the condenser before the high pressure protection control is activated.
  • control device is configured such that the inlet temperature of the air passage of the condenser is a second temperature or more, and the degree of subcooling of the outlet of the condenser is a first predetermined value or more At this time, it is determined that the refrigerant is stagnating in the condenser, and the opening degree of the expansion valve is increased.
  • control device controls the opening degree of the expansion valve such that the degree of superheat at the outlet of the evaporator becomes the target degree of superheat during normal operation different from during refrigerant retention.
  • the target degree of superheat at the outlet of the evaporator is greater than the target degree of superheat in normal operation. Also set low.
  • control device reduces the operating capacity of the compressor if the high pressure is equal to or higher than the first pressure.
  • An air conditioner further includes an outdoor unit containing a compressor and a condenser, an indoor unit containing an expansion valve, and an evaporator, and the outdoor unit Multiple indoor units are connected.
  • the air conditioner according to the ninth aspect of the present disclosure does not have a container for adjusting the amount of refrigerant.
  • coolant system diagram of an air conditioning apparatus It is a flowchart of motor-operated valve control at the time of normal operation. It is a flowchart of compressor capacity control at the time of normal operation. It is a flowchart of high pressure protection control at the time of normal operation. It is a flowchart of motor-operated valve control at the time of refrigerant retention. It is the same time chart. It is a flowchart of motor-operated valve control at the time of high pressure rise. It is the same time chart. It is a flowchart of motor-operated valve control at the time of operation capacity reduction. It is the same time chart. It is a flowchart of compressor capacity control at the time of operating capacity increase. It is the same time chart.
  • Air conditioner> (1) Overall Configuration The overall configuration of the air conditioning apparatus 100 will be described using FIG.
  • the broken lines in FIG. 1 represent electrical signal lines.
  • the upstream side or the downstream side is defined according to the flow direction of the refrigerant.
  • the air conditioning apparatus 100 is an apparatus for cooling a room such as a building using a vapor compression refrigeration cycle.
  • the air conditioner 100 is a cooling dedicated device.
  • the air conditioning apparatus 100 includes an outdoor unit 10, four indoor units 20a, 20b, 20c, and 20d, connection pipes 41 and 42, and a controller 50 as a control device.
  • the outdoor unit 10 is provided outside the building.
  • the outdoor unit 10 includes a compressor 11, an outdoor heat exchanger 12 as a condenser, and an outdoor fan 13.
  • the compressor 11, the outdoor heat exchanger 12, and the outdoor fan 13 are accommodated in an outdoor casing (not shown).
  • the compressor 11 feeds refrigerant gas from low pressure to high pressure.
  • a suction pipe 31 is connected to the low pressure side of the compressor 11.
  • a low pressure sensor 61 is provided in the vicinity of the compressor 11 of the suction pipe 31.
  • a discharge pipe 32 is connected to the high pressure side of the compressor 11.
  • a high pressure sensor 62 and a high pressure shutoff pressure switch 82 are provided in the vicinity of the compressor 11 of the discharge pipe 32.
  • the outdoor heat exchanger 12 exchanges heat between the air and the refrigerant, and condenses the refrigerant gas into the refrigerant liquid.
  • the upstream side of the outdoor heat exchanger 12 is connected to the discharge pipe 32.
  • the downstream side of the outdoor heat exchanger 12 is connected to the liquid pipe 33.
  • An outdoor heat exchanger outlet temperature sensor 71 is provided in the vicinity of the outdoor heat exchanger 12 of the liquid pipe 33. That is, the outdoor heat exchanger outlet temperature sensor 71 is provided at the outlet of the outdoor heat exchanger 12.
  • the outdoor fan 13 is driven by an electric motor (not shown) and blows air toward the outdoor heat exchanger 12.
  • An outdoor suction air temperature sensor 74 is provided on the suction side of the outdoor fan 13. Specifically, the outdoor suction air temperature sensor 74 is provided at the air suction port of the outdoor casing.
  • the low pressure sensor 61 detects the refrigerant gas sucked by the compressor 11, that is, the low pressure LP of the air conditioner 100.
  • the high pressure sensor 62 detects the refrigerant gas compressed by the compressor 11, that is, the high pressure HP of the air conditioner 100.
  • the outdoor heat exchanger outlet temperature sensor 71 detects the temperature of the refrigerant liquid at the outlet of the outdoor heat exchanger 12 (outdoor heat exchanger outlet temperature Tco).
  • the outdoor suction air temperature sensor 74 detects the indoor suction air temperature Tb of the outdoor unit 10.
  • the high pressure shutoff pressure switch 82 stops the air conditioner 100 if the high pressure HP of the air conditioner 100 is equal to or higher than a predetermined value HPm.
  • the indoor unit 20a is provided in a room of a building.
  • the indoor unit 20a is connected to the outdoor unit 10 by a communication pipe (liquid pipe 33 and suction pipe 31).
  • the indoor unit 20a includes an electric valve 21a as an expansion valve, an indoor heat exchanger 22a as an evaporator, an indoor fan 23a, and a remote controller (not shown).
  • the motor operated valve 21a, the indoor heat exchanger 22a and the indoor fan 23a are accommodated in an indoor casing (not shown).
  • the motor operated valve 21 a is for expanding the refrigerant liquid into a gas-liquid mixed refrigerant.
  • the motor operated valve 21a is electrically driven to perform an operation of increasing or decreasing the degree of opening.
  • the upstream side of the motor operated valve 21 a is connected to the communication pipe 41.
  • the indoor heat exchanger 22a exchanges heat between the air and the refrigerant to evaporate the gas-liquid mixed refrigerant into the refrigerant gas.
  • the downstream side of the indoor heat exchanger 22 a is connected to the communication pipe 42.
  • the indoor heat exchanger outlet temperature sensor 72a is provided at the outlet of the indoor heat exchanger 22a.
  • the indoor fan 23a is driven by an electric motor (not shown) and blows air toward the indoor heat exchanger 22a.
  • An indoor suction air temperature sensor 73a is provided on the suction side of the indoor fan 23a. Specifically, the indoor suction air temperature sensor 73a is provided at the air suction port of the indoor casing.
  • the remote control is for the user to input ON / OFF of the indoor unit 20a or the set temperature Ts in the room.
  • the indoor heat exchanger outlet temperature sensor 72a detects the temperature of the refrigerant gas at the outlet of the indoor heat exchanger 22a (the indoor heat exchanger outlet temperature Teo).
  • the indoor suction air temperature sensor 73a detects the indoor suction air temperature Ta of the indoor unit 20a.
  • the indoor units 20b, 20c, and 20d are the same as the configuration of the indoor unit 20a, and thus the description thereof is omitted. In addition, below, when showing any of indoor unit 20a, 20b, 20c, 20d, it is only set as the indoor unit 20. FIG. The same applies to the motor operated valve 21, the indoor heat exchanger 22, the indoor heat exchanger outlet temperature sensor 72 or the indoor suction air temperature sensor 73.
  • the controller 50 includes a control board (not shown) provided on the outdoor unit 10 communicably connected to each other by wire or wirelessly and a control board (not shown) provided on the indoor units 20a, 20b, 20c, 20d. Is configured. Further, the controller 50 includes one or more CPUs, a ROM, a RAM, and the like.
  • the controller 50 includes a low pressure sensor 61, a high pressure sensor 62, a high pressure cutoff pressure switch 82, an outdoor heat exchanger outlet temperature sensor 71, a motor operated valve 21, an indoor heat exchanger outlet temperature sensor 72, and indoor suction.
  • the air temperature sensor 73 and the remote controller of the indoor unit 20 are connected.
  • the controller 50 has a function of changing the rotational frequency of the compressor 11 to control the operating capacity Cap of the compressor 11.
  • the controller 50 has a function of controlling the opening degree of the motor-operated valve 21.
  • the controller 50 has a function of detecting the operating capacity TON of the indoor unit 20.
  • the indoor unit 20 has a capacity.
  • the operating capacity TON represents the capacity of the indoor unit 20 being operated (thermo-ON). Note that, with the operating capacity TON, the capacity of the indoor unit 20 that is thermo-OFF is excluded.
  • the air conditioner 100 is not provided with a container for adjusting the amount of refrigerant, such as a receiver and an accumulator.
  • the communication pipes 41, 42 are for connecting the outdoor unit 10 and the plurality of indoor units 20a, 20b, 20c, 20d.
  • the high temperature and high pressure refrigerant gas compressed by the compressor 11 flows toward the outdoor heat exchanger 12.
  • the high-temperature and high-pressure refrigerant gas is deprived of heat by the air and condensed into the refrigerant liquid.
  • the condensed refrigerant liquid flows toward the motor-operated valve 21a.
  • the refrigerant liquid is expanded into a gas-liquid mixed refrigerant by the motor-operated valve 21a.
  • the gas-liquid mixed refrigerant flows toward the indoor heat exchanger 22a.
  • the indoor heat exchanger 22a the gas-liquid mixed refrigerant is given heat by the air and evaporated to a refrigerant gas.
  • the evaporated refrigerant gas is drawn into the compressor 11.
  • the motored valve control S100 in normal operation will be described with reference to FIG.
  • the normal operation is a cooling operation, and is different from the control at the time of refrigerant retention, the time of high pressure rise, and the time of reduction of the operating capacity, which will be described later.
  • the indoor units 20b, 20c and 20d are turned off, and only the normal operation of the indoor unit 20a will be described.
  • step S101 the controller 50 detects the indoor heat exchanger outlet temperature Teo by the indoor heat exchanger outlet temperature sensor 72a.
  • the controller 50 detects the low pressure LP by the low pressure sensor 61.
  • step S103 the controller 50 calculates the evaporation temperature Te from the low pressure LP.
  • step S104 the controller 50 calculates the degree of superheat SH at the outlet of the indoor heat exchanger 22a from the indoor heat exchanger outlet temperature Teo and the evaporation temperature Te.
  • step S105 the controller 50 decreases the degree of opening of the motor operated valve 21a when the degree of superheat SH is smaller than the target degree of superheat SHm set in advance.
  • the controller 50 increases the opening degree of the motor-operated valve 21a.
  • the air conditioning apparatus 100 is operated such that the degree of superheat SH of the indoor heat exchanger 22a becomes equal to the target degree of superheat SHm during normal operation.
  • the wet operation or the overheat operation of the compressor 11 can be avoided.
  • step S201 the controller 50 detects the indoor suction air temperature Ta by the indoor suction air temperature sensor 73a.
  • step S202 the controller 50 detects the set temperature Ts set by the remote control.
  • step S203 the controller 50 controls the operating capacity Cap of the compressor 11 based on the difference (heat load) between the indoor suction air temperature Ta and the set temperature Ts. Specifically, the controller 50 increases the operating capacity Cap when the difference between the indoor suction air temperature Ta and the set temperature Ts is large, and the difference between the indoor suction air temperature Ta and the set temperature Ts is small. Reduces the operating capacity Cap.
  • the operating capacity Cap of the compressor 11 is controlled such that the indoor suction air temperature Ta approaches the set temperature Ts.
  • capacity control of the compressor 11 suitable for the heat load is executed, and the indoor suction air temperature Ta can be promptly set to the set temperature Ts.
  • the operating capacity Cap of the compressor 11 may be controlled such that the evaporation temperature Te becomes constant at the target evaporation temperature Tem. Specifically, when the evaporation temperature Te is higher than the target evaporation temperature Tem, the operating capacity Cap of the compressor 11 is controlled to be large. On the other hand, when the evaporation temperature Te is lower than the target evaporation temperature Tem, the operating capacity Cap of the compressor 11 is controlled to be small.
  • the target evaporation temperature Tem is set to decrease as the operating capacity TON of the indoor unit 20 increases, and to increase as the operating capacity TON of the indoor unit 20 decreases.
  • step S301 the controller 50 detects the high pressure HP by the high pressure sensor 62.
  • step S302 the controller 50 determines whether the high pressure HP is larger than a predetermined value HPn.
  • the predetermined value HPn is smaller than the predetermined value HPm set by the high-pressure shutoff pressure switch 82.
  • step S302 when the high pressure HP is larger than the predetermined value HPn, the process proceeds to step S303. If the high pressure HP is less than or equal to the predetermined value HPn, the process returns to S301. In step S303, the controller 50 reduces the operating capacity Cap of the compressor 11.
  • the motored valve control S110 at the time of refrigerant retention will be described with reference to FIG. 5 and FIG.
  • the motor-operated valve control S110 is control for securing the cooling capacity during the cooling operation under high outside air.
  • step S111 the controller 50 detects the outdoor heat exchanger outlet temperature Tco with the outdoor heat exchanger outlet temperature sensor 71.
  • the controller 50 detects the high pressure HP by the high pressure sensor 62.
  • step S113 the controller 50 calculates the condensation temperature Tc from the high pressure HP.
  • step S114 the controller 50 calculates the degree of subcooling SC at the outlet of the outdoor heat exchanger 12 from the outdoor heat exchanger outlet temperature Tco and the condensation temperature Tc.
  • step S115 the controller 50 proceeds to step S116 when the condensation temperature Tc is equal to or higher than the predetermined temperature Tc1 set in advance. If the condensation temperature Tc is less than the predetermined temperature Tc1, the process returns to S111.
  • step S116 the controller 50 proceeds to step S117 when the degree of subcooling SC is greater than or equal to a predetermined value SC1 set in advance. If the degree of subcooling SC is less than the predetermined value SC1, the process returns to S111. In step S117 (during refrigerant retention), the controller 50 determines that the refrigerant liquid is staying in the outdoor heat exchanger 12, and sets the target degree of superheat SHm in the motor-operated valve control S100 low.
  • the refrigerant liquid stagnates in the outdoor heat exchanger 12, the high pressure HP (condensing temperature Tc) rises, the high pressure protection control S300 operates, and the operating capacity Cap of the compressor 11 decreases.
  • step S115 the condensation temperature Tc is detected to be equal to or higher than a predetermined temperature Tc1.
  • step S116 the degree of subcooling SC is detected to be equal to or greater than a predetermined value SC1. Then, in step S116, it is determined that the refrigerant liquid is staying in the outdoor heat exchanger 12, and the target degree of superheat SHm is set to be lower than the current degree.
  • the opening degree of the motor operated valve 21a increases (6a in FIG. 6). Since the opening degree of the motor operated valve 21 a is increased, the refrigerant liquid accumulated in the outdoor heat exchanger 12 escapes from the outdoor heat exchanger 12.
  • the condensation temperature Tc decreases (6b in FIG. 6).
  • the high pressure protection control S300 is released. By releasing the high pressure protection control S300, the operating capacity Cap of the compressor 11 is increased (6c in FIG. 6).
  • the motored valve control S120 at the time of high pressure rising will be described with reference to FIG. 7 and FIG.
  • the motor-operated valve control S120 is control for preventing the high-pressure shutoff pressure switch 82 from stopping the air conditioning apparatus 100 when the high-pressure pressure HP sharply rises in the cooling operation under high outside air.
  • step S121 the controller 50 detects the high pressure HP from the high pressure sensor 62.
  • step S122 the controller 50 proceeds to step S123 when the high pressure HP is equal to or greater than a predetermined value HP2 set in advance. If the high pressure HP is less than the predetermined value HP2, the process returns to S121.
  • step S123 when the operating capacity Cap of the compressor 11 is equal to or less than a predetermined value Cap2 set in advance, the controller 50 proceeds to step S124. If the operating capacity Cap is larger than the predetermined value Cap2, the process proceeds to step S125.
  • step S124 the controller 50 determines that the refrigerant is rapidly staying in the outdoor heat exchanger 12, and increases the opening degree of the motor operated valve 21a by a predetermined amount.
  • step S125 the controller 50 decreases the operating capacity Cap of the compressor 11 by a predetermined amount.
  • step S122 it is detected that the high pressure HP is equal to or greater than a predetermined value HP2.
  • step S123 it is detected that the operating capacity Cap of the compressor 11 is equal to or less than a predetermined value Cap2.
  • step S124 it is determined that the refrigerant is rapidly staying in the outdoor heat exchanger 12, and the opening degree of the motor-operated valve 21a is increased by a predetermined amount.
  • the opening degree of the motor-operated valve 21a is increased by a predetermined amount, the refrigerant liquid which rapidly stays in the outdoor heat exchanger 12 escapes from the outdoor heat exchanger 12.
  • the refrigerant liquid staying in the outdoor heat exchanger 12 escapes from the outdoor heat exchanger 12, whereby the high pressure HP decreases (8a in FIG. 8).
  • the motor-operated valve control S130 is control for avoiding the stop of the air conditioner 100 when the operating capacity TON of the indoor unit 20 sharply decreases and the high pressure HP increases rapidly.
  • step S131 the controller 50 detects the operating capacity TON as the operating capacity TON1 (the indoor units 20a, 20b, 20c, 20d are ON).
  • step S132 the controller 50 proceeds to step S133 after the predetermined time t3 has elapsed.
  • step S133 the controller 50 detects the operating capacity TON as the operating capacity TON2 (the indoor unit 20 is ON).
  • step S134 if the operating capacity TON2 is smaller than the operating capacity TON1, the controller 50 proceeds to step S135. If the operating capacity TON2 is equal to or larger than the operating capacity TON1, the process returns to S131.
  • step S135 the controller 50 sets the ratio of the operating capacity TON2 to the operating capacity TON1, that is, when the operating capacity change rate R as the changing rate of the operating capacity TON of the indoor unit 20 in the predetermined time t3 is the predetermined rate R3 or less. It transfers to step S136. If the operating capacity change rate R is larger than the predetermined rate R3, the process returns to S131.
  • step S136 the controller 50 detects the high pressure HP by the high pressure sensor 62.
  • step S137 the controller 50 determines that the refrigerant is rapidly staying in the outdoor heat exchanger 12 when the high pressure HP is equal to or greater than the predetermined value HP3 set in advance, and proceeds to step S138. If the high pressure HP is less than the predetermined value HP3, the process returns to S131.
  • step S138 the controller 50 detects the low pressure LP by the low pressure sensor 61.
  • step S139 the controller 50 calculates a differential pressure dP between the high pressure HP and the low pressure LP.
  • step S140 the controller 50 calculates the condensation temperature Tc from the high pressure HP.
  • step S141 the controller 50 detects the outdoor heat exchanger outlet temperature Tco with the outdoor heat exchanger outlet temperature sensor 71.
  • step S142 the controller 50 calculates the degree of subcooling SC at the outlet of the outdoor heat exchanger 12 from the outdoor heat exchanger outlet temperature Tco and the condensation temperature Tc.
  • step S143 the controller 50 increases the opening degree of the motor operated valve 21a by a predetermined amount ⁇ Ev according to the differential pressure dP and the subcooling degree SC. Specifically, when the differential pressure dP and the degree of subcooling SC are large, the predetermined amount ⁇ Ev to be increased is increased, and when the differential pressure dP and the degree of subcooling SC are small, the predetermined amount ⁇ Ev to be increased is decreased. .
  • step S131 the operating capacity TON is detected as the operating capacity TON1 (the indoor units 20a, 20b, 20c, 20d are ON).
  • step S133 the operating capacity TON is detected as the operating capacity TON2 (the indoor unit 20a is ON).
  • step S134 it is detected that the operating capacity TON2 is smaller than the operating capacity TON1.
  • step S1335 it is detected that the operating capacity change rate R is equal to or less than a predetermined rate R3. At this time, in the air conditioning apparatus 100, it is determined that the operating capacity TON of the indoor unit 20 has rapidly decreased.
  • step S137 it is detected that the high pressure Hp is greater than or equal to the predetermined value HP3, and it is determined that the refrigerant is rapidly staying in the outdoor heat exchanger 12.
  • step S143 the opening degree of the motor operated valve 21a is increased based on the differential pressure dP and the degree of subcooling SC.
  • the opening degree of the motor-operated valve 21a is increased, so that the refrigerant liquid rapidly staying in the outdoor heat exchanger 12 escapes from the outdoor heat exchanger 12.
  • the refrigerant liquid staying in the outdoor heat exchanger 12 escapes from the outdoor heat exchanger 12, whereby the high pressure HP decreases (10a in FIG. 10).
  • the compressor operating capacity control S210 at the time of operating capacity increase will be described using FIG. 11 and FIG.
  • the compressor operating capacity control S210 is control for suppressing the rise of the evaporation temperature Te when the operating capacity TON of the indoor unit 20 sharply increases and the evaporation temperature Te rises rapidly.
  • step S211 the controller 50 detects the operating capacity TON of the indoor unit 20 as the operating capacity TON3 (the indoor unit 20a is ON).
  • step S212 the controller 50 proceeds to step S213 after the predetermined time t4 has elapsed.
  • step S213 the controller 50 detects the operating capacity TON as the operating capacity TON 4 (the indoor units 20a, 20b, 20c, 20d are ON).
  • step S214 when the operating capacity TON4 is larger than the operating capacity TON3, the controller 50 proceeds to step S215. If the operating capacity TON4 is less than or equal to the operating capacity TON3, the process returns to S211.
  • step S215 the controller 50 sets the ratio of the operating capacity TON4 to the operating capacity TON3, that is, when the operating capacity change rate R as the changing rate of the operating capacity TON of the indoor unit 20 in the predetermined time t4 is the predetermined rate R4 or more. It is determined that the operating capacity TON of the indoor unit 20 has rapidly increased, and the process proceeds to step S216. If the operating capacity change rate R is smaller than the predetermined rate R4, the process returns to S211.
  • step S216 the controller 50 detects the indoor suction air temperatures Taa, Tab, Tac, Tad by the indoor suction air temperature sensors 73a, 73b, 73c, 73d.
  • the average value of the indoor suction air temperatures Taa, Tab, Tac, Tad of the indoor units 20a, 20b, 20c, 20d being operated is taken as the indoor suction air temperature average Ta-ave.
  • step S217 the controller 50 increases the operating capacity Cap of the compressor 11 by a predetermined amount ⁇ Cap according to the increased operating capacity TON and the indoor suction air temperature average Ta-ave.
  • the increased operating capacity TON is the operating capacity TON 4 detected in step S213.
  • the predetermined amount ⁇ Cap to be increased is large, and when the operating capacity TON and the indoor suction air temperature average Ta-ave are small, the increase is The predetermined amount ⁇ Cap to be reduced is small.
  • the compressor operating capacity control S200 during normal operation the compressor operating capacity control S200 during normal operation (the operating capacity Cap of the compressor 11 based on the evaporation temperature Te In addition to the control), the feed-forward control increases the operating capacity Cap of the compressor 11 according to the operating capacity TON and the indoor suction air temperature average Ta-ave.
  • step 211 the operating capacity TON is detected as an operating capacity TON3 (the indoor unit 20a is ON).
  • the operating capacity TON is detected as the operating capacity TON4 (the indoor units 20a, 20b, 20c, 20d are ON).
  • the air conditioning apparatus 100 it is determined that the operating capacity TON of the indoor unit 20 has rapidly increased.
  • step 216 the indoor suction air temperature Ta is detected.
  • step S217 the operating capacity Cap of the compressor 11 is increased by a predetermined amount ⁇ Cap based on the operating capacity TON and the indoor suction air temperature Ta.
  • the operating pressure Cap of the compressor 11 is increased by the predetermined amount ⁇ Cap, so that the low pressure LP decreases and the increase of the evaporation temperature Te is suppressed (12a in FIG. 12).
  • the rise of the evaporation temperature Te By suppressing the rise of the evaporation temperature Te, a decrease in the heat exchange efficiency of the indoor heat exchanger 22 is avoided.
  • the air conditioning apparatus 100 is a dedicated cooling apparatus, and there is no need to collect excess refrigerant, so the receiver is eliminated. However, even in the air conditioning apparatus 100, excess refrigerant is generated when the operating capacity of the indoor unit 20 is small (for example, only the indoor unit 20a is turned on).
  • the generated surplus refrigerant stagnates in the outdoor heat exchanger 12.
  • heat exchange in the outdoor heat exchanger 12 is hindered. If the heat exchange in the outdoor heat exchanger 12 is hindered, the heat exchange efficiency of the outdoor heat exchanger 12 is reduced. Further, when the refrigerant liquid is stagnating in the outdoor heat exchanger 12 under high outside air, the high pressure pressure HP rises, and the high pressure protection control S300 operates. When the high pressure protection control S300 is activated, the cooling capacity is reduced.
  • a refrigerant circuit to which the compressor 11, the outdoor heat exchanger 12, the motor-operated valve 21, and the indoor heat exchanger 22 are connected, and a controller 50 for controlling the opening degree of the motor-operated valve 21a.
  • the controller 50 increases the opening degree of the motor-operated valve 21a when it is determined that the refrigerant liquid is staying in the outdoor heat exchanger 12 and the coolant is staying.
  • the opening degree of the motor-operated valve 21a is increased. At this time, the refrigerant liquid accumulated in the outdoor heat exchanger 12 flows from the outdoor heat exchanger 12 toward the indoor heat exchanger 22a.
  • the refrigerant liquid accumulated in the outdoor heat exchanger 12 can be released from the outdoor heat exchanger 12.
  • the controller 50 determines that the refrigerant is staying in the outdoor heat exchanger 12 when the degree SC of subcooling at the outlet of the outdoor heat exchanger 12 is equal to or greater than the predetermined value SC1 as the first predetermined value. And the opening degree of the motor operated valve 21 is increased.
  • the air conditioning apparatus 100 it is determined that the refrigerant liquid is stagnating in the outdoor heat exchanger 12 when the degree of subcooling SC at the outlet of the outdoor heat exchanger 12 is greater than or equal to the predetermined value SC1. And the opening degree of the motor operated valve 21a is increased. At this time, the refrigerant liquid accumulated in the outdoor heat exchanger 12 flows from the outdoor heat exchanger 12 toward the indoor heat exchanger 22a.
  • the refrigerant liquid accumulated in the outdoor heat exchanger 12 can be released from the outdoor heat exchanger 12.
  • the controller 50 is configured such that the condensation temperature Tc of the outdoor heat exchanger 12 is equal to or higher than the predetermined temperature Tc1 as the first temperature, and the degree of supercooling SC at the outlet of the outdoor heat exchanger 12 is a predetermined value When it is SC1 or more, it is determined that the refrigerant is stagnating in the outdoor heat exchanger 12, and the opening degree of the motor-operated valve 21 is increased.
  • the air conditioning apparatus 100 when the condensation temperature Tc of the outdoor heat exchanger 12 is equal to or higher than the predetermined temperature Tc1, it is determined that the state before the high pressure protection control S300 is activated. When the degree of subcooling SC at the outlet of the exchanger 12 is equal to or greater than the predetermined value SC1, it is determined that the refrigerant liquid is staying in the outdoor heat exchanger 12, and the degree of opening of the motored valve 21a is increased. At this time, the refrigerant liquid accumulated in the outdoor heat exchanger 12 flows from the outdoor heat exchanger 12 toward the indoor heat exchanger 22a.
  • the refrigerant liquid remaining in the outdoor heat exchanger 12 can be released from the outdoor heat exchanger 12 before the high pressure protection control S300 operates.
  • the controller 50 is configured such that the inlet temperature of the air passage of the outdoor heat exchanger 12 is equal to or higher than a predetermined value as the second temperature, and the degree SC of subcooling of the outlet of the outdoor heat exchanger 12 is predetermined. When it is the value SC1 or more, it is determined that the refrigerant is stagnating in the outdoor heat exchanger 12, and the opening degree of the motor-operated valve 21 is increased.
  • the air conditioner 100 when the air inlet temperature of the outdoor heat exchanger 12 is equal to or higher than the predetermined value, it is determined that the state before the high pressure protection control S300 is activated, and the outdoor heat exchange is performed.
  • the degree SC of subcooling at the outlet of the vessel 12 is equal to or greater than the predetermined value SC1
  • SC1 the degree of opening of the motored valve 21a
  • the refrigerant liquid remaining in the outdoor heat exchanger 12 can be released from the outdoor heat exchanger 12 before the high pressure protection control S300 operates.
  • the controller 50 controls the opening degree of the motor operated valve 21 such that the degree of superheat SH at the outlet of the indoor heat exchanger 22 becomes the target degree of superheat SHm during normal operation different from during refrigerant retention. .
  • the air conditioning apparatus 100 is operated such that the degree of superheat SH of the indoor heat exchanger 22a becomes equal to the target degree of superheat SHm during normal operation.
  • the wet operation or the overheat operation of the compressor 11 can be avoided.
  • the target degree of superheat SHm of the outlet of the indoor heat exchanger 22a is the target degree of superheat SHm in normal operation. Set lower than.
  • the decrease in the heat exchange efficiency of the indoor heat exchanger 22 can be avoided.
  • the controller 50 reduces the operating capacity of the compressor 11 if the high pressure HP of the air conditioning apparatus 100 is equal to or greater than the predetermined value HPn as the first pressure.
  • the air conditioner 100 further includes an outdoor unit 10 housing the compressor 11 and the outdoor heat exchanger 12, an indoor unit 20 housing the motor operated valve 21 and the indoor heat exchanger 22.
  • a plurality of indoor units 20a, 20b, 20c, 20d are connected to the outdoor unit 10.
  • the air conditioner 100 does not have a container for adjusting the amount of refrigerant.
  • step S115 of the motor-operated valve control S110 the controller 50 determines whether the condensation temperature Tc is equal to or higher than a predetermined temperature Tc1 set in advance, but the outdoor suction air temperature tb of the outdoor heat exchanger 12 is set in advance. You may judge by whether it is more than predetermined temperature tb1.
  • the motor-operated valve control S110 may be executed ignoring step S115. That is, if the degree of subcooling SC is equal to or more than the predetermined value SC1 set in advance, the controller 50 may immediately shift to step S117 to set the target degree of superheat SHm low.
  • the motor-operated valve control S110 is applied to the cooling operation of the cooling-dedicated device, but may be applied to the heating operation of the air conditioner capable of cooling and heating.
  • the present invention can be used for an air conditioner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention fournit un dispositif de conditionnement d'air qui permet de libérer d'un condenseur un réfrigérant liquide en rétention dans celui-ci. Le dispositif de conditionnement d'air (100) de l'invention est équipé : d'un circuit de réfrigérant dans lequel sont connectés un compresseur (21), un échangeur de chaleur intérieur (12), une vanne motorisée (21) et un échangeur de chaleur extérieur (22) ; et d'un organe de régulation (50) commandant le degré d'ouverture de la vanne motorisée (21). Cet organe de régulation (50) augmente le degré d'ouverture de la vanne motorisée (21), dans le cas d'une rétention de réfrigérant telle que le réfrigérant liquide est jugé en rétention dans l'échangeur de chaleur intérieur (12).
PCT/JP2017/039995 2017-11-06 2017-11-06 Dispositif de conditionnement d'air WO2019087405A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/039995 WO2019087405A1 (fr) 2017-11-06 2017-11-06 Dispositif de conditionnement d'air

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/039995 WO2019087405A1 (fr) 2017-11-06 2017-11-06 Dispositif de conditionnement d'air

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WO2019087405A1 true WO2019087405A1 (fr) 2019-05-09

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07190455A (ja) * 1993-12-28 1995-07-28 Mitsubishi Electric Corp 冷凍・空調システム
JP2001255024A (ja) * 2000-03-10 2001-09-21 Mitsubishi Heavy Ind Ltd 空気調和機およびその制御方法
JP2005241155A (ja) * 2004-02-27 2005-09-08 Mitsubishi Electric Corp 空気調和機
JP2014025673A (ja) * 2012-07-30 2014-02-06 Fujitsu General Ltd 空気調和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07190455A (ja) * 1993-12-28 1995-07-28 Mitsubishi Electric Corp 冷凍・空調システム
JP2001255024A (ja) * 2000-03-10 2001-09-21 Mitsubishi Heavy Ind Ltd 空気調和機およびその制御方法
JP2005241155A (ja) * 2004-02-27 2005-09-08 Mitsubishi Electric Corp 空気調和機
JP2014025673A (ja) * 2012-07-30 2014-02-06 Fujitsu General Ltd 空気調和装置

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