WO2014112615A1 - Dispositif de cycle de réfrigération binaire - Google Patents

Dispositif de cycle de réfrigération binaire Download PDF

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Publication number
WO2014112615A1
WO2014112615A1 PCT/JP2014/050915 JP2014050915W WO2014112615A1 WO 2014112615 A1 WO2014112615 A1 WO 2014112615A1 JP 2014050915 W JP2014050915 W JP 2014050915W WO 2014112615 A1 WO2014112615 A1 WO 2014112615A1
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Prior art keywords
temperature side
high temperature
low
temperature
low temperature
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PCT/JP2014/050915
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English (en)
Japanese (ja)
Inventor
英樹 丹野
山本　学
新悟 遠山
馨 松下
Original Assignee
東芝キヤリア株式会社
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Application filed by 東芝キヤリア株式会社 filed Critical 東芝キヤリア株式会社
Priority to CN201480005380.6A priority Critical patent/CN104937352B/zh
Priority to KR1020157019193A priority patent/KR101673105B1/ko
Priority to JP2014557525A priority patent/JP5982017B2/ja
Publication of WO2014112615A1 publication Critical patent/WO2014112615A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • 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
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/026—Compressor control by controlling unloaders
    • 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
    • F25B2700/2106—Temperatures of fresh outdoor air
    • 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
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • 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
    • 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
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21161—Temperatures of a condenser of the fluid heated by the condenser

Definitions

  • the embodiment of the present invention relates to a dual refrigeration cycle apparatus including a high temperature side refrigeration cycle and a low temperature side refrigeration cycle.
  • a conventionally known binary refrigeration cycle apparatus includes a high temperature side refrigeration cycle and a low temperature side refrigeration cycle, and the high temperature side refrigeration cycle and the low temperature side refrigeration cycle share one cascade heat exchanger (intermediate heat exchanger),
  • the refrigerant circulating in the high temperature side refrigeration cycle and the refrigerant circulating in the low temperature side refrigeration cycle are heat-exchanged by a cascade heat exchanger, and water or hot water is heated by the high temperature side refrigerant circulating in the high temperature side refrigeration cycle. Is generated.
  • an object of the present invention is to provide a dual refrigeration cycle apparatus capable of suppressing the amount of refrigerating machine oil discharged outside the compressor during startup at a low outside air temperature.
  • a binary refrigeration cycle apparatus includes a high temperature side compressor, a high temperature side condenser, a high temperature side expansion device, a cascade heat exchanger, and a high temperature side accumulator.
  • a high temperature side refrigeration circuit that communicates via a pipe, a low temperature side compressor, a cascade heat exchanger, a low temperature side expansion device, a low temperature side evaporator, and a low temperature side accumulator that communicates via a low temperature side refrigerant pipe
  • a high temperature side bypass circuit connecting the discharge side of the high temperature side compressor and the inlet side of the high temperature side accumulator; a high temperature side bypass valve provided in the high temperature side bypass circuit; And a control means for opening the high temperature side bypass valve.
  • the binary refrigeration cycle apparatus having the above features further has the following preferred embodiments.
  • the low temperature side bypass circuit that connects the discharge side of the low temperature side compressor and the inlet side of the low temperature side accumulator, the low temperature side bypass valve provided in the low temperature side bypass circuit, and the outside air temperature is a predetermined value at the time of startup
  • the control means drives the high temperature side compressor at a predetermined operating frequency while the high temperature side bypass valve is open.
  • the control unit includes a low outside air temperature start mode selection means for determining whether or not to execute the low outside air temperature start mode based on the incoming water temperature and the outside air temperature.
  • a bypass circuit opening time setting means for setting a time for opening the bypass circuit according to the temperature
  • a high temperature side bypass control means for opening the high temperature side bypass circuit according to the outside air temperature when executing the low outside temperature start mode
  • a low outside temperature start mode Low temperature side bypass control means for opening the low temperature side bypass circuit in addition to the high temperature side bypass circuit according to the outside air temperature at the time of execution.
  • the binary refrigeration cycle apparatus in the present embodiment starts the operation of the high temperature side compressor with the high temperature side bypass circuit opened when the outside air temperature is low and the dilution of the refrigeration oil is likely to occur. It is possible to raise the temperature of the refrigerating machine oil in the compressor by flowing a high-temperature gas refrigerant into the interior. Accordingly, it is possible to suppress the refrigerant from being dissolved in the refrigerating machine oil, and to suppress the discharge amount of the refrigerating machine oil to the outside of the compressor due to dilution.
  • FIG. 1 is a configuration diagram of a refrigeration cycle showing a configuration of a binary refrigeration cycle apparatus according to an embodiment of the present invention.
  • the dual refrigeration cycle apparatus R used as the high temperature water generating apparatus includes a high temperature side refrigeration cycle Ra, a low temperature side refrigeration cycle Rb, and a control unit 20 mounted in the housing K.
  • the high temperature side refrigeration cycle Ra includes a high temperature side compressor 1 that compresses the refrigerant, a hot water heat exchanger 2 (high temperature side condenser) that condenses the refrigerant, a high temperature side expansion device 3 that decompresses the refrigerant, and a low temperature side refrigeration cycle.
  • a cascade heat exchanger 4 that exchanges heat with the Rb refrigerant and a high-temperature side accumulator 5 for gas-liquid separation of the refrigerant are provided, and these are sequentially communicated via a refrigerant pipe.
  • the cascade heat exchanger 4 functions as an evaporator that evaporates the refrigerant flowing through the high temperature side refrigerant flow path 4a in the high temperature side refrigeration cycle Ra.
  • a refrigerant side channel 2a through which the refrigerant of the high temperature side refrigeration cycle Ra and a water side channel 2b through which water to be heated flows, and the water side channel 2b is provided with hot water. It communicates with the pipe H.
  • a water pump 18 is provided in the hot water pipe H.
  • the discharge side of the high temperature side compressor 1 and the inlet side of the high temperature side accumulator 5 are communicated by a high temperature side bypass circuit 6.
  • the high temperature side bypass circuit 6 is provided with a high temperature side bypass valve 7 which is an on-off valve.
  • the low temperature side refrigeration cycle Rb includes a low temperature side compressor 11 that compresses refrigerant, a four-way valve 12 that switches a flow direction of refrigerant between a heating operation and a defrosting operation, a cascade heat exchanger 4, and a low temperature side that depressurizes the refrigerant. It has an expansion device 13, an air heat exchanger (low temperature side evaporator) 14 for evaporating the refrigerant, and a low temperature side accumulator 15, and these are sequentially communicated via refrigerant piping.
  • the cascade heat exchanger 4 functions as a condenser that condenses the refrigerant flowing through the low temperature side refrigerant flow path 4b in the low temperature side refrigeration cycle Rb.
  • a blower 19 for sending air to the air heat exchanger 14 is provided at a position facing the air heat exchanger 14.
  • the discharge side of the low temperature side compressor 11 and the inlet side of the low temperature side accumulator 15 are communicated by a low temperature side bypass circuit 16.
  • the low temperature side bypass circuit 16 is provided with a low temperature side bypass valve 17 which is an on-off valve.
  • R134a refrigerant is used in the high temperature side refrigeration cycle Ra
  • R410A refrigerant is used in the low temperature side refrigeration cycle Rb
  • R134a used for the high temperature side refrigeration cycle Ra has a lower saturated gas density and saturation pressure at the same temperature than the R410A used for the low temperature side refrigeration cycle Rb, so that it can generate high temperature water. It is suitable as a refrigerant used for the high temperature side refrigeration cycle Ra of the apparatus.
  • PVE polyvinyl ether
  • POE polyol ester
  • PVE used as the refrigerating machine oil of the high temperature side compressor 1 is suitable as a refrigerating machine oil for the high temperature side compressor because the wear of the compression mechanism is less than that of the POE at a high temperature.
  • PVE has the property of being easily dissolved by the R134a refrigerant as compared with POE, and has the property of increasing the amount of oil discharged when the low outside air temperature is started.
  • the low temperature side refrigeration cycle Rb is operated by driving the.
  • water supply pump 18 of the hot water pipe H water flows in the water side flow path 2b of the hot water heat exchanger 2. This water is heated by the heat radiated from the high temperature side refrigerant in the refrigerant side flow path 2a and becomes high temperature water of about 90 ° C. at the maximum.
  • This hot water is supplied from a hot water pipe H to a place where hot water is required.
  • the relationship between the control unit 20 and each component is shown in FIG.
  • the high temperature side refrigeration cycle Ra and the low temperature side refrigeration cycle Rb By operating the high temperature side refrigeration cycle Ra and the low temperature side refrigeration cycle Rb, heat exchange is performed in the heat exchanger 4 including the high temperature side refrigerant flow channel 4a and the low temperature side refrigerant flow channel 4b, and the high temperature side refrigeration cycle Ra is performed.
  • the high temperature side refrigerant is warmed by the heat radiated from the low temperature side refrigerant of the low temperature side refrigeration cycle Rb.
  • the high temperature side refrigerating cycle Ra the temperature of the refrigerant sucked into the high temperature side compressor 1 is increased, and the temperature and pressure in the high temperature side compressor 1 are compared with the temperature and pressure in the low temperature side compressor 11.
  • the amount of heat radiated from the refrigerant side flow path 2a of the hot water heat exchanger 2 increases, and high temperature water can be generated.
  • the two-stage refrigeration cycle apparatus R includes a control unit 20 including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like inside the housing K.
  • the control unit 20 includes a high temperature side compressor 1 drive control inverter circuit 21, a low temperature side compressor 11 drive control inverter circuit 22, a blower 19 drive control inverter circuit 23, a high temperature side expansion device 3, and a low temperature side expansion device. 13, the four-way valve 12, the high temperature side bypass valve 7, the low temperature side bypass valve 17, and the pump 18 are connected and their operations are controlled.
  • the controller 20 includes temperature sensors 31a and 31b and pressure sensors 32a and 32b provided on the discharge side of the high temperature side compressor 1 and the low temperature side compressor 11, and temperature sensors 33a and 33b and pressure sensor 34a provided on the suction side. , 34b, an inlet water temperature sensor 35 provided on the inlet side of the water channel 2b of the hot water heat exchanger 2, an outlet water temperature sensor 36 provided on the outlet side, and a temperature sensor (not shown) provided on the cascade heat exchanger 4 ), A temperature sensor (not shown) provided in the air heat exchanger 14, and an outside air temperature sensor 37 provided in the vicinity of the air heat exchanger 14. 2 shows a state in which the temperature sensor 31a, the inlet water temperature sensor 35, and the outside air temperature sensor 37 are connected to the control unit 20.
  • the high temperature side compressor 1 drive control inverter circuit 21 rectifies the voltage of a power source such as a commercial AC power source, converts it into a voltage having a frequency according to a command from the control unit 20, and compresses the high temperature side compressor 1. Output to the machine motor 1M. This output becomes the driving power for the compressor motor 1M.
  • the low temperature side compressor 11 drive control inverter circuit 22 drives the compressor motor 11M of the low temperature side compressor 11, and the blower 19 drive control inverter circuit 23 drives the fan motor 19M of the blower 19.
  • the water pump 18 is also driven by a water pump drive control inverter (not shown).
  • the control unit 20 determines operating conditions of each unit based on information such as operating conditions input from an operation unit (both not shown) such as a touch panel and a remote controller and detection signals from various sensors, and the compressor motor 1M, 11M, fan motor 19M, four-way valve 12, each expansion device 3, 13, each bypass valve 7, 17, and pump 18 are driven.
  • an operation unit both not shown
  • the compressor motor 1M, 11M, fan motor 19M, four-way valve 12, each expansion device 3, 13, each bypass valve 7, 17, and pump 18 are driven.
  • the control unit 20 includes the following means (1) to (4) as main functions.
  • the high temperature side bypass control means 20c that opens the high temperature side bypass circuit 6 in accordance with the outside air temperature To when the low outside air temperature activation mode is executed.
  • Low temperature side bypass control means 20d that opens the low temperature side bypass circuit 16 in addition to the high temperature side bypass circuit 6 in accordance with the outside air temperature To when the low outside temperature start mode is executed.
  • FIG. 3 is a flowchart of processing executed by the control unit 20 of the dual refrigeration cycle apparatus R
  • FIG. 4 is an explanatory diagram showing the relationship between the outside air temperature and the operation in the low outside air temperature starting mode.
  • the operator operates the operation unit provided on the hot water supply side or the operation unit provided in the dual refrigeration cycle apparatus R, or the operation is started according to the operation schedule set in any of the operation units.
  • the controller 20 first detects the incoming water temperature Twi detected by the inlet water temperature sensor 35 provided on the inlet side of the water-side flow path 2 b of the hot water heat exchanger 2 and the outside air temperature sensor 37. To obtain the outside air temperature To. And the control part 20 is higher than predetermined
  • prescribed temperature Twis for example, 40 degreeC
  • the refrigerating machine oil is easily diluted when the temperature of the refrigerating machine oil in the compressor is lowered and the refrigerant pressure is suddenly increased.
  • the incoming water temperature Twi is 40 ° C. or lower
  • the condensation pressure in the hot water heat exchanger 2 of the high temperature side refrigeration cycle Ra is not high, so the pressure in the compressor suddenly increases even when the high temperature side compressor 1 is started. There is nothing. Therefore, dilution of the refrigerating machine oil hardly occurs even when the temperature of the refrigerating machine oil is low (the outside air temperature To is low).
  • the controller 20 does not execute the low outside air temperature activation mode when the incoming water temperature Twi is 40 ° C. or lower or the outside air temperature To is higher than 20 ° C. (in the case of No in step S1).
  • the control unit 20 executes a low outside air temperature starting mode described below.
  • the control unit 20 controls the opening time of the bypass circuit and the opening and closing of the bypass valve according to the outside air temperature To.
  • the control unit 20 sets a bypass circuit open time (bypass circuit open set time) Ts according to the outside air temperature To.
  • the control unit 20 determines whether or not the outside air temperature To is within a range of predetermined values T1 to T2 (T2 ⁇ To ⁇ T1) (step S3).
  • T1 is 20 ° C., for example, and T2 is ⁇ 10 ° C. If the outside air temperature To is higher than ⁇ 10 ° C. and not higher than 20 ° C. (in the case of Yes in step S3), the control unit 20 proceeds to step S5 and sets the opening time ts of the high temperature side bypass valve 7 of the high temperature side bypass circuit 6 to a predetermined value. Time t1 (for example, 6 minutes) is set.
  • Step S4 the outside air temperature To is in a range of predetermined values T2 to T3 (T3 ⁇ To ⁇ It is determined whether or not T2).
  • T3 is, for example, ⁇ 15 ° C. If the outside air temperature To is higher than ⁇ 15 ° C. and lower than ⁇ 10 ° C. (in the case of Yes in Step S4), the control unit 20 proceeds to Step S6 and opens the high-temperature side bypass valve 7 of the high-temperature side bypass circuit 6 for the open time ts. Is set to a predetermined time t2 (for example, 8 minutes).
  • Step S4 When the outside air temperature To is ⁇ 15 ° C. or lower (No in Step S4), the control unit 20 proceeds to Step S7 and opens the bypass valves 7 and 17 of the high temperature side bypass circuit 6 and the low temperature side bypass circuit 16.
  • the time ts is set to a predetermined time t3 (for example, 30 minutes).
  • the control unit 20 starts the operation of the high temperature side compressor 1 after opening the high temperature side bypass valve 7 of the high temperature side bypass circuit 6 (step 8). Furthermore, it progresses to step S9 and the driving
  • the control unit 20 acquires the temperature Td of the discharge gas refrigerant detected by the temperature sensor 31a, and determines whether or not the discharge gas temperature Td exceeds a predetermined temperature (step S12).
  • the predetermined temperature is a temperature 80 ° C. obtained by subtracting a predetermined value ⁇ (for example, 10 ° C.) from a hot water set temperature (target set temperature) Twos (for example, 90 ° C.) set by the operation unit.
  • Step 12S When the discharged gas refrigerant temperature Td exceeds 80 ° C. (Twos ⁇ 10 ° C.) in Step 12S (No in Step S11), the control unit 20 determines that the refrigerating machine oil in the compressor 1 has been sufficiently warmed. Then, the high temperature side bypass valve 7 is closed (step S14). Moreover, even if the discharge gas refrigerant temperature Td does not exceed 80 ° C. (in the case of Yes in step S11), the control unit 20 sets the elapsed time t after the high-pressure side bypass circuit 6 is opened to the bypass circuit open setting.
  • step S14 When time ts (6 minutes in step S5, 8 minutes in step S6) has elapsed (in the case of Yes in step S13), it is determined that the refrigeration oil in the compressor 1 has been warmed, and the high-temperature side bypass valve 7 is closed (step S14).
  • control part 20 cancels
  • the control unit 20 drives the high temperature side compressor 1 at a constant operating frequency (for example, 30 Hz) smaller than the operating frequency during normal operation while the high temperature side bypass valve 7 is open. . If the operating frequency of the high temperature side compressor 1 is suddenly increased or driven at a high operating frequency under conditions where the refrigerating machine oil is easily diluted, the amount of refrigerating machine oil discharged outside the compressor increases. End up. Therefore, when the low outside air temperature start-up mode is executed, the amount of the refrigerating machine oil discharged to the outside of the compressor can be suppressed by maintaining the operating frequency of the high temperature side compressor 1 at 30 Hz.
  • a constant operating frequency for example, 30 Hz
  • the low temperature side compressor 11 is driven at the same operating frequency as the normal operation because the dilution of the refrigeration oil is less likely to occur than the high temperature side compressor 1.
  • the low temperature side compressor 11 is also driven at a low operating frequency, the heat given to the high temperature side refrigeration cycle Ra by the low temperature side refrigeration cycle Rb is insufficient, and it takes time to start up the high temperature side refrigeration cycle Ra. Accordingly, in order to quickly raise the discharge gas temperature Td of the high temperature side compressor 1, the low temperature side compressor 11 is driven in the same manner as in the normal operation.
  • the operation in the low outside air temperature start mode when the outside air temperature To is extremely low will be described.
  • the outside air temperature To is extremely low, such as ⁇ 15 ° C. (predetermined temperature T3)
  • the high-temperature side refrigerant sleeps in the high-temperature side refrigeration cycle Ra, and the refrigerant circulation rate is reduced.
  • the side bypass valve 7 is opened and the high temperature side compressor 1 is driven at a low operating frequency
  • the low temperature side refrigerant of the low temperature side refrigeration cycle Rb cannot completely dissipate in the cascade heat exchanger 4. Therefore, the high-pressure side pressure in the low-temperature side refrigeration cycle Rb suddenly increases, and a protective device such as a high-pressure switch acts to forcibly stop the operation of the dual refrigeration cycle device R.
  • a protective device such as a high-pressure switch acts to forcibly stop the operation of the dual refrigeration cycle device R.
  • control unit 20 performs the case where the outside air temperature To is lower than ⁇ 15 ° C. (in the case of No in step S4). ) Sets the bypass circuit opening set time ts to 30 minutes (t3) (step S7), then opens the high temperature side bypass valve 7 (step S10) and opens the low temperature side bypass valve 17 (step S11).
  • bypass circuit opening set time ts is set to 6 minutes (t1: step S5) or 8 minutes (t2: step S6). Long 30 minutes (t3) is set.
  • the high temperature side bypass valve 7 of the high temperature side bypass circuit 6 is opened by the command from the control unit 20 to start the operation of the high temperature side compressor 1 (step S10). Further, according to a command from the control unit 20, the low temperature side bypass valve 17 of the low temperature side bypass circuit 16 is opened, and the operation of the low temperature side compressor 11 is started (step S11).
  • the high temperature side compressor 1 is driven at a low operation frequency (30 Hz constant), and the low temperature side compressor 11 is driven at a normal operation frequency.
  • the control unit 20 determines that the refrigerating machine oil in the high temperature side compressor 1 has been sufficiently warmed. Judgment is made to close the high temperature side bypass valve 6 and the low temperature side bypass valve 16 (step S14). In addition, the control unit 20 determines that the high-pressure side bypass valve 7 and the low-temperature side bypass valve 17 are opened even if the discharge gas refrigerant temperature Td does not exceed 80 ° C. (Twos ⁇ 10 ° C.) (Yes in Step S12).
  • control unit 20 closes the high temperature side bypass valve 7 and the low temperature side bypass valve 17, then cancels the low outside air temperature activation mode (step S15), and shifts to normal operation.
  • the dual refrigeration cycle apparatus R can be operated even under a situation where the outside air temperature To is extremely low.
  • the binary refrigeration cycle apparatus R in the present embodiment operates the high temperature side compressor 1 with the high temperature side bypass circuit 6 opened when the outside air temperature is low and the refrigeration oil is likely to be diluted.
  • a high-temperature gas refrigerant can be flowed into the compressor to increase the temperature of the refrigeration oil in the compressor. Accordingly, it is possible to suppress the refrigerant from being dissolved in the refrigerating machine oil, and to suppress the discharge amount of the refrigerating machine oil to the outside of the compressor due to dilution.
  • the binary refrigeration cycle apparatus R in the present embodiment prevents a high pressure abnormality in the low temperature side cycle Rb by opening the bypass circuit 16 of the low temperature side refrigeration cycle Rb even under a situation where the outside air temperature is extremely low. be able to.
  • the binary refrigeration cycle apparatus R by this invention is not limited to a hot water production
  • the air heat exchanger 14 of the low temperature side refrigeration cycle Rb instead of the air heat exchanger 14 of the low temperature side refrigeration cycle Rb, if a heat exchanger that absorbs heat from hot waste water in a factory or the like is used, the heat exchanger surface like the air heat exchanger 14 is used. Since frosting does not occur, the four-way valve 12 for making the low temperature side refrigeration cycle Rb a reverse cycle can be removed.
  • the refrigerant used in the high temperature side refrigeration cycle Ra and the low temperature side refrigeration cycle Rb is not limited to R134a and R410A, and refrigerants such as R32, R245fa, HFO-1234yf, and HFO-1234ze may be used.
  • SYMBOLS 1 ... High temperature side compressor, 2 ... Hot water heat exchanger, 3 ... High temperature side expansion apparatus, 4 ... Cascade heat exchanger, 5 ... High temperature side accumulator, 6 ... High temperature side bypass circuit, 7 ... High temperature side bypass valve, Ra ... High temperature side refrigeration circuit, 11 ... Low temperature side compressor, 12 ... Four-way valve, 13 ... Low temperature side expansion device, 14 ... Air heat exchanger, 15 ... Low temperature side accumulator, 16 ... Low temperature side bypass circuit, 17 ... Low temperature side bypass valve DESCRIPTION OF SYMBOLS 18 ... Water pump, Rb ... Low temperature side freezing circuit, K ... Housing, 20 ... Control part (control means), 21, 22, 23 ... Inverter apparatus.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

La présente invention se rapporte à un dispositif de cycle de réfrigération binaire qui comprend : un circuit de réfrigération côté haute température dans lequel un compresseur côté haute température, un condensateur côté haute température, une unité d'expansion côté haute température, un échangeur de chaleur à cascade et un accumulateur côté haute température communiquent par l'intermédiaire d'un tuyau de fluide frigorigène côté haute température ; un circuit de réfrigération côté basse température dans lequel un compresseur côté basse température, l'échangeur de chaleur à cascade, une unité d'expansion côté basse température, un évaporateur côté basse température et un accumulateur côté basse température communiquent par l'intermédiaire d'un tuyau de fluide frigorigène côté basse température ; un circuit de dérivation côté haute température qui raccorde le côté de décharge du compresseur côté haute température et le côté d'entrée de l'accumulateur côté haute température ; une soupape de dérivation côté haute température qui est agencée dans le circuit de dérivation côté haute température ; et un moyen de commande qui ouvre la soupape de dérivation côté haute température si la température de l'air extérieur est égale ou inférieure à une température prédéterminée au moment de la remise en marche.
PCT/JP2014/050915 2013-01-21 2014-01-20 Dispositif de cycle de réfrigération binaire WO2014112615A1 (fr)

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CN201480005380.6A CN104937352B (zh) 2013-01-21 2014-01-20 二元制冷循环装置
KR1020157019193A KR101673105B1 (ko) 2013-01-21 2014-01-20 2원 냉동 사이클 장치
JP2014557525A JP5982017B2 (ja) 2013-01-21 2014-01-20 二元冷凍サイクル装置

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WO2016113899A1 (fr) * 2015-01-16 2016-07-21 三菱電機株式会社 Dispositif à cycle frigorifique
JP2016223741A (ja) * 2015-06-03 2016-12-28 東芝キヤリア株式会社 冷凍サイクル装置
JPWO2016147305A1 (ja) * 2015-03-16 2017-09-28 三菱電機株式会社 空調給湯複合システム
CN110285619A (zh) * 2019-06-28 2019-09-27 中国科学院理化技术研究所 复叠式热泵控制方法及系统
WO2021014644A1 (fr) * 2019-07-25 2021-01-28 三菱電機株式会社 Climatiseur
WO2023189382A1 (fr) * 2022-03-31 2023-10-05 株式会社富士通ゼネラル Dispositif de réfrigération à deux étages
CN117469871A (zh) * 2023-12-26 2024-01-30 珠海格力电器股份有限公司 一种制冷系统的控制方法、装置、制冷系统及存储介质

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KR101975008B1 (ko) 2018-09-19 2019-05-07 (주)본씨앤아이 수분 결빙 방지가 가능한 반도체 설비 냉각용 냉각 시스템
KR101975007B1 (ko) 2018-09-19 2019-05-07 (주)본씨앤아이 반도체 설비 냉각용 냉각 시스템
KR102330756B1 (ko) 2020-03-02 2021-11-25 스타우프코리아유한회사 이원냉동 방식 항온항습 시스템

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JPH08189713A (ja) * 1995-01-13 1996-07-23 Daikin Ind Ltd 二元冷凍装置
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WO2016113899A1 (fr) * 2015-01-16 2016-07-21 三菱電機株式会社 Dispositif à cycle frigorifique
JPWO2016113899A1 (ja) * 2015-01-16 2017-07-13 三菱電機株式会社 冷凍サイクル装置
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JPWO2016147305A1 (ja) * 2015-03-16 2017-09-28 三菱電機株式会社 空調給湯複合システム
JP2016223741A (ja) * 2015-06-03 2016-12-28 東芝キヤリア株式会社 冷凍サイクル装置
CN110285619A (zh) * 2019-06-28 2019-09-27 中国科学院理化技术研究所 复叠式热泵控制方法及系统
WO2021014644A1 (fr) * 2019-07-25 2021-01-28 三菱電機株式会社 Climatiseur
WO2023189382A1 (fr) * 2022-03-31 2023-10-05 株式会社富士通ゼネラル Dispositif de réfrigération à deux étages
JP7388467B2 (ja) 2022-03-31 2023-11-29 株式会社富士通ゼネラル 二元冷凍装置
CN117469871A (zh) * 2023-12-26 2024-01-30 珠海格力电器股份有限公司 一种制冷系统的控制方法、装置、制冷系统及存储介质
CN117469871B (zh) * 2023-12-26 2024-04-05 珠海格力电器股份有限公司 一种制冷系统的控制方法、装置、制冷系统及存储介质

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CN104937352B (zh) 2017-08-08
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CN104937352A (zh) 2015-09-23
JPWO2014112615A1 (ja) 2017-01-19
JP5982017B2 (ja) 2016-08-31

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