WO2015198751A1 - ヒートポンプ式チラー - Google Patents
ヒートポンプ式チラー Download PDFInfo
- Publication number
- WO2015198751A1 WO2015198751A1 PCT/JP2015/064167 JP2015064167W WO2015198751A1 WO 2015198751 A1 WO2015198751 A1 WO 2015198751A1 JP 2015064167 W JP2015064167 W JP 2015064167W WO 2015198751 A1 WO2015198751 A1 WO 2015198751A1
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- WIPO (PCT)
- Prior art keywords
- circulating fluid
- refrigerant
- circulating
- circuit
- compressor
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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
- 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
- F25B49/025—Motor control arrangements
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
- F25D31/002—Liquid coolers, e.g. beverage cooler
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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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
- 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
- F25B49/022—Compressor control arrangements
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/003—Indoor unit with water as a heat sink or heat source
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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
- F25B2327/00—Refrigeration system using an engine for driving a compressor
- F25B2327/001—Refrigeration system using an engine for driving a compressor of the internal combustion type
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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
- F25B2500/00—Problems to be solved
- F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
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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
- F25B2600/00—Control issues
- F25B2600/01—Timing
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0251—Compressor control by controlling speed with on-off operation
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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
- F25B2600/00—Control issues
- F25B2600/13—Pump speed control
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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
- F25B27/00—Machines, plants or systems, using particular sources of energy
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
- F25B2700/21172—Temperatures of an evaporator of the fluid cooled by the evaporator at the inlet
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
- F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/02—Timing
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/10—Sensors measuring the temperature of the evaporator
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/16—Sensors measuring the temperature of products
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the present invention relates to a heat pump chiller that cools a liquid to be cooled by heat exchange with a refrigerant circulating in a refrigeration cycle.
- Patent Document 1 discloses a configuration shown in FIG. 5 for preventing freezing of a chiller using a refrigerator.
- the chiller of Patent Document 1 executes a refrigeration cycle with a compressor 501, a condenser 502, an expansion valve 503, and an evaporator 504, and cools a liquid to be cooled by heat exchange with a refrigerant circulating in the cycle. .
- the liquid to be cooled is circulated by the circulation pump 520 in a closed circuit between the evaporator (heat exchanger) 504 and the cold water tank 510.
- a liquid electromagnetic valve 505 is provided on the primary side of the expansion valve 503, and the temperature of the primary side of the liquid electromagnetic valve 505 is monitored by the first temperature sensor 506 at the time of activation.
- the bypass valve 507 is opened while the liquid electromagnetic valve 505 is closed, and the refrigerant discharged from the compressor 501 is supplied to the second expansion valve 503. Bypass to the next side. By bypassing the refrigerant in this way, the refrigerant does not circulate in the refrigeration cycle, and freezing of the circulating water (cooled liquid) from the cold water tank 510 in the evaporator (heat exchanger) 504 can be prevented.
- the object of the present invention is to provide a heat pump chiller that can prevent the liquid to be cooled from freezing even when there is a problem with the circulation pump or when there is a possibility of the problem.
- a heat pump chiller circulates a refrigerant in the order of a compressor, a refrigerant-air heat exchanger, an expansion valve, and a refrigerant-circulating liquid heat exchanger.
- a heat pump chiller comprising: a refrigerant circuit to be executed; and a circulating fluid circuit that circulates a circulating fluid cooled by heat exchange in the refrigerant-circulating fluid heat exchanger, wherein the circulating fluid circuit is provided with a circulating pump.
- the compressor of the refrigerant circuit is not started unless it is confirmed that the drive of the circulation pump can be continued by receiving a predetermined signal, so that the circulating fluid stagnates in the refrigerant-circulating fluid heat exchanger. It is possible to prevent the circulating fluid from freezing and the like.
- the predetermined signal is (1) A signal indicating that the circulation pump is operating normally, (2) a signal indicating that the circulating fluid temperature can be monitored normally, and (3) a signal indicating that the circulating pump is not overloaded, and any of the predetermined signals within the predetermined time. If even one of them is not received, the power supply circuit of the circulation pump is turned off and the start of the compressor is stopped.
- a flow switch that is turned on by detecting the flow of the circulating fluid in the circulating fluid circuit and a thermal relay that is turned off when the circulating pump reaches a predetermined temperature or more are provided.
- a temperature sensor is provided at each of the circulating fluid evaporator inlet, the evaporator outlet, and the evaporator surface, and the control unit is turned off by either the flow switch or the thermal relay.
- the compressor and the circulating pump are stopped, and the state corresponding to the time when the circulating fluid is about to be frozen. Is detected, the drive of the circulation pump is maintained while the compressor is stopped, so that the freezing of the circulating fluid in the refrigerant-circulating fluid heat exchanger can be prevented more reliably.
- the heat pump chiller of the present invention does not start the compressor of the refrigerant circuit unless it is confirmed that the drive of the circulation pump can be continued by receiving a predetermined signal. For this reason, there is an effect that it is possible to prevent the circulating fluid from being frozen in a case where a failure occurs in the circulation pump or a case where a failure may occur.
- FIG. 1 is a block diagram showing a schematic configuration of a heat pump chiller (hereinafter simply referred to as a chiller) 100 according to the present embodiment.
- the chiller 100 generally includes a refrigerant circuit 110 that circulates a refrigerant and a circulating fluid circuit 200 that circulates a circulating fluid.
- the control device (control unit) 140 controls the operation of the entire chiller 100.
- the refrigerant circuit 110 includes a compressor 10, a refrigerant-air heat exchanger 20, an expansion valve 40, and a refrigerant-circulating liquid heat exchanger 50.
- the chiller 100 executes a refrigeration cycle by circulating refrigerant in the order of the compressor 10, the refrigerant-air heat exchanger 20, the expansion valve 40, and the refrigerant-circulated liquid heat exchanger 50.
- the chiller 100 cools the circulating fluid by heat exchange in the refrigerant-circulating fluid heat exchanger 50 (heat exchange between the circulating fluid and the refrigerant) (cooling operation).
- the compressor 10 compresses and discharges the sucked refrigerant.
- the refrigerant-air heat exchanger 20 exchanges heat between the refrigerant and air (specifically, outside air).
- the expansion valve 40 expands the refrigerant compressed by the compressor 10.
- the refrigerant-circulating liquid heat exchanger 50 exchanges heat between the circulating liquid and the refrigerant.
- the compressor 10 may be a unit in which a plurality of compressors are connected in parallel.
- the refrigerant-air heat exchanger 20 is a unit in which a plurality of refrigerant-air heat exchangers are connected in parallel. There may be.
- the expansion valve 40 can be adjusted in opening degree by an instruction signal from the control device 140. Thereby, the expansion valve 40 can adjust the circulation amount of the refrigerant in the refrigerant circuit 110.
- the expansion valve 40 is formed by connecting a plurality of expansion valves that can be closed in parallel. By doing so, the expansion valve 40 can adjust the circulation amount of the refrigerant in the refrigerant circuit 110 by combining the expansion valves to be opened.
- the refrigerant-air heat exchanger fan 30 is provided to efficiently perform heat exchange in the refrigerant-air heat exchanger 20.
- the engine 60 is provided as a drive source that drives the compressor 10.
- the drive source for driving the compressor 10 is not limited to the engine, and another drive source (for example, a motor) may be used.
- the chiller 100 is configured to perform a heating operation in addition to the cooling operation. For this reason, the chiller 100 includes a four-way valve 111 and a bridge circuit 112 on the refrigerant discharge side of the compressor 10.
- the four-way valve 111 switches the flow direction of the refrigerant between the cooling operation and the heating operation according to an instruction signal from the control device 140. That is, during the cooling operation, the inflow port (lower side in FIG. 1) and one connection port (left side in FIG. 1) are connected, and the other connection port (right side in FIG. 1) and the outflow port ( 1 (upper line in FIG. 1). Further, during the heating operation, the inlet (lower side in FIG. 1) and the other connection port (right side in FIG. 1) are connected, and one connection port (left side in FIG. 1) and the outlet ( 1 (upper line in FIG. 1).
- the bridge circuit 112 automatically switches the refrigerant flow direction between the cooling operation and the heating operation.
- the bridge circuit 112 includes four check valves (a first check valve 112a, a second check valve 112b, a third check valve 112c, and a fourth check valve 112d).
- the first check valve 112a and the second check valve 112b are connected in series so that the refrigerant flows in the same direction, and constitute a first check valve train.
- the third check valve 112c and the fourth check valve 112d are connected in series so that the refrigerant flows in the same direction, and constitute a second check valve train.
- the first check valve row and the second check valve row are connected in parallel so that the refrigerant flows in the same direction.
- a connection point between the first check valve 112a and the second check valve 112b is a first intermediate connection point P1
- the connection between the first check valve 112a and the third check valve 112c is the connection point between the third check valve 112c and the fourth check valve 112d.
- the connection point between the third check valve 112c and the fourth check valve 112d is the second intermediate connection point P3, and the second check valve 112b and the fourth check point 112b.
- a connection point with the check valve 112d is an inflow connection point P4.
- the refrigerant flow path includes the compressor 10, the four-way valve 111, the refrigerant-air heat exchanger 20, the bridge circuit 112 (P1 to P2), the expansion valve 40, and the bridge circuit 112 (P4 to P3).
- the refrigerant-circulating liquid heat exchanger 50, the four-way valve 111, and the compressor 10 become the refrigeration cycle.
- the refrigerant flow path includes the compressor 10, the four-way valve 111, the refrigerant-circulating fluid heat exchanger 50, the bridge circuit 112 (P3 to P2), the expansion valve 40, and the bridge circuit 112 (P4).
- the refrigerant-air heat exchanger 20, the four-way valve 111, and the compressor 10 are executed, and the heating cycle is executed.
- the chiller 100 further includes an oil separator 81, an accumulator 82, and a receiver 83.
- the oil separator 81 separates the lubricating oil of the compressor 10 contained in the refrigerant, and returns the separated lubricating oil to the compressor 10.
- the accumulator 82 separates the refrigerant liquid that has not completely evaporated in the refrigerant-circulated liquid heat exchanger 50 acting as an evaporator or the refrigerant-air heat exchanger 20 acting as an evaporator.
- the receiver 83 temporarily stores the high-pressure liquid refrigerant from the bridge circuit 112.
- the chiller 100 includes a four-way valve 111 and a bridge circuit 112 so that the cooling operation and the heating operation can be switched.
- the present invention is characterized by the operation during the cooling operation. It is what has. For this reason, this invention is applicable also to the chiller which can implement only a cooling operation.
- the circulating fluid flowing through the circulating fluid circuit 200 becomes a liquid to be cooled that is cooled by heat exchange in the refrigerant-circulating fluid heat exchanger 50 during the cooling operation.
- the liquid to be heated is heated by heat exchange in the refrigerant-circulating liquid heat exchanger 50.
- the circulating fluid is used, for example, as cold water or hot water used in a building air conditioning system.
- water is used as the circulating fluid, but the present invention is not limited to this, and a solution in which an antifreeze or the like is mixed in water may be used.
- the circulating fluid circuit 200 includes an inflow pipe 211, an outflow pipe 212, and a circulation pump 300.
- the circulating fluid is introduced into the refrigerant-circulating fluid heat exchanger 50 via the inflow pipe 211, and the temperature is adjusted in the refrigerant-circulating fluid heat exchanger 50.
- the circulating fluid whose temperature has been adjusted is discharged from the chiller 100 through the outflow pipe 212.
- the circulating fluid circuit 200 included in the chiller 100 basically forms only a part of a closed circuit through which the circulating fluid flows. That is, when the chiller 100 according to the present embodiment is used for an air conditioning system in a building, the circulating fluid circuit on the air conditioning system side and the circulating fluid circuit 200 on the chiller 100 side are connected to form a closed circuit. Circulating fluid flows in the circuit.
- the circulation pump 300 is a pump for circulating the circulating fluid in the closed circuit. In the configuration shown in FIG. 1, the circulation pump 300 is provided in the outflow pipe 212, but may be provided in the
- the chiller 100 includes an inflowing circulating fluid temperature sensor TWR, an outflowing circulating fluid temperature sensor TWL, a heat exchanger surface temperature sensor TWS, and a pressure sensor PL in order to prevent the circulating fluid from freezing during the cooling operation. I have.
- the inflow circulating fluid temperature sensor TWR is provided in the inflow tube 211 and detects the temperature of the circulating fluid flowing into the refrigerant-circulating fluid heat exchanger 50 (specifically, the circulating fluid in the inflow tube 211).
- the outflow circulating fluid temperature sensor TWL is provided in the outflow pipe 212 and detects the temperature of the circulating liquid flowing out from the refrigerant-circulating liquid heat exchanger 50 (specifically, the circulating liquid in the outflow pipe 212).
- the heat exchanger surface temperature sensor TWS is provided on the surface of the refrigerant-circulating liquid heat exchanger 50 and detects the surface temperature.
- the pressure sensor PL is provided in the refrigerant suction path of the compressor 10 and detects the pressure of the refrigerant flowing out from the refrigerant-circulated liquid heat exchanger 50. Note that the refrigerant evaporating temperature of the refrigerant flowing out of the refrigerant-circulating fluid heat exchanger 50 is obtained from the pressure detected by the pressure sensor PL.
- the control device 140 performs the following control based on detection signals from various sensors in order to prevent the circulating fluid from freezing during the cooling operation. Specifically, the temperature detected by any of the inflowing circulating fluid temperature sensor TWR, the outflowing circulating fluid temperature sensor TWL, and the heat exchanger surface temperature sensor TWS, or the refrigerant evaporation temperature converted from the detected pressure of the pressure sensor PL is predetermined. When it is detected that the temperature is lower than (eg, 2 ° C.), the compressor 10 is stopped and the circulation pump 300 is operated.
- a predetermined temperature for example, 2 ° C.
- the refrigeration cycle of the refrigerant circuit 110 is stopped by stopping the compressor 10, and the circulating pump 300 is operated to make it difficult to freeze the circulating fluid in the circulating fluid circuit 200.
- the four sensors prevent freezing due to refrigerant supercooling during cold weather. There is no direct relationship with the anti-freezing function (freezing prevention by an interlock mechanism described later) in the present invention. Also, these sensors do not necessarily have to have all four.
- the circulation pump 300 must be driven during the cooling operation of the chiller 100 according to the present embodiment. When a malfunction occurs in the circulation pump 300 and the pump is stopped, if the compressor 10 is continuously driven in this state, the cooling of the circulating fluid stagnating in the refrigerant-circulating fluid heat exchanger 50 occurs and freezing occurs. There is a fear.
- the present invention is characterized by preventing the above-mentioned freezing and has an interlock mechanism for preventing freezing.
- the configuration of this interlock mechanism will be described below with reference to FIG.
- the interlock here is a mechanism that cannot perform other operations unless certain conditions are met.
- the compressor 10 when the chiller 100 is started, the compressor 10 cannot be started unless the normal operation of the circulating fluid circuit 200 is confirmed. This prevents the circulating fluid from freezing due to a malfunction of the circulation pump 300 or the like.
- the interlock mechanism includes a controller / power supply unit 400, a control box 410 and a pump unit 420.
- the controller / power source unit 400 includes a controller board 401 and two types of power sources (AC 230V power source and AC 200V power source).
- AC 230V power source is used as a driving power source for the circulation pump 300
- AC 200V power source is used as a power source for sensors and the like.
- the control box 410 includes a flow switch 411, a first connection relay 412, a second connection relay 413, and a third connection relay 414.
- the flow switch 411 is a switch that is turned on by detecting this flow when the circulation pump 300 is driven to generate a flow of the circulating fluid. That is, when the flow switch 411 is off, it is determined that the circulation pump 300 is not driven.
- the first connection relay 412 is a relay that is turned on when a sensor that monitors the temperature of the circulating fluid (for example, the inflowing circulating fluid temperature sensor TWR described above) is on.
- the first connection relay 412 is a relay that is turned on / off depending on whether or not the sensor (for example, the inflowing circulating fluid temperature sensor TWR) is operating, and is turned on / off by the detected temperature of the sensor. Is not to be done.
- the sensor for example, the inflowing circulating fluid temperature sensor TWR
- a plurality of first connection relays 412 corresponding to each sensor are also provided.
- the second connection relay 413 and the third connection relay 414 are connected in series with the motor 301 (the drive source of the circulation pump 300), and when both are connected, power is supplied to the motor 301.
- the pump unit 420 includes a motor 301 and a thermal relay 421 that are driving sources of the circulation pump 300.
- the thermal relay 421 monitors the temperature of the motor 301 and is turned off when the temperature exceeds a predetermined temperature. That is, when the thermal relay 421 is turned off, it is determined that the circulation pump 300 is in an overload state.
- the controller board 401 is connected to a closed circuit formed by connecting the flow switch 411 and the first connection relay 412 in series, and detects that this circuit is conductive (current is flowing through this circuit).
- the second connection relay 413 and the third connection relay 414 are made conductive. That is, the controller board 401 detects that the closed circuit is conductive when the flow switch 411 and the first connection relay 412 are both conductive.
- the controller board 401 is a part of the control device 140. When the continuity of the closed circuit is no longer detected, the control device 140 turns off the second connection relay 413 and the third connection relay 414 and stops the power supply to the motor 301.
- CP described in FIG. 2 is an overcurrent protection relay.
- the thermal relay 421 is connected in series with an AC 200V power source to form a closed circuit. When the thermal relay 421 is turned off (non-conducting), no current flows through the closed circuit. This current is monitored by the control device 140, and when the current is no longer detected (when the thermal relay 421 is turned off), the control device 140 also uses the second connection relay 413 and the second connection relay 414. Is turned off and power supply to the motor 301 is stopped.
- power supply to the motor 301 (drive of the circulation pump 300) is continued when all of the following three conditions (a) to (c) are satisfied, and the conditions (a) to (c) If any one of these is not satisfied, the power supply to the motor 301 is stopped.
- the flow switch 411 is on (the circulation pump 300 is normally driven).
- the first connection relay 412 is ON (the circulating fluid temperature is normally monitored).
- Thermal relay 421 is on (circulation pump 300 is not overloaded).
- the on-signal of the flow switch 411, the on-signal of the first connection relay 412 and the on-signal of the thermal relay 421 indicate that the circulating fluid circuit described in the claims is operating normally. It corresponds to the predetermined signal which shows.
- the drive source of the compressor 10 is the engine 60, and in order to stop the start of the compressor 10, control for closing a gas valve for adjusting fuel supply to the engine 60 is performed, or the start of the engine 60 is performed. If it is before, it is possible to perform control to stop the power supply to the starter. Or when the drive source of the compressor 10 is a motor, the control which stops the electric power feeding to this motor may be sufficient.
- the startup sequence of the chiller 100 will be described with reference to the time chart of FIG.
- TWR inflowing circulating fluid temperature sensor
- TWR is illustrated as a sensor that monitors the temperature of the circulating fluid (hereinafter simply referred to as a temperature sensor).
- the chiller operation signal is turned on to activate the refrigerant circuit 110, and the pump operation signal is turned on to activate the circulating fluid circuit 200 (time T1).
- the detection signal of the temperature sensor is on and the thermal relay 421 is also on.
- the detection signal of the temperature sensor in FIG. 3 is a signal that is turned on / off depending on the detected temperature. Specifically, the signal is turned off when the detected temperature is 2 ° C. or lower, and turned on when the detected temperature exceeds 2 ° C. It becomes.
- the pump operation signal at time T1 By turning on the pump operation signal at time T1, the driving of the circulation pump 300 is started, and the circulation of the circulating fluid is started in the circulating fluid circuit 200. Then, the flow switch 411 detects the circulation of the circulating fluid, and the flow switch 411 is turned on at time T2.
- the refrigerant circuit 110 does not start immediately because the flow switch 411 is not turned on at that time.
- the flow switch 411 is turned on at time T2
- the activation sequence of the refrigerant circuit 110 is started.
- the outdoor fan is first started and pre-purge is performed.
- the outdoor fan is a fan for chiller ventilation, but may be a fan that is also used as the refrigerant-air heat exchanger fan 30.
- fan control of the outdoor fan and drive control of the cooling water pump (pump for circulating the cooling water of the engine 60) are started.
- the starter of the engine 60 is driven, and the engine 60 is started at time T3. That is, driving of the compressor 10 (starting of the refrigerant circuit 110) is started by starting the engine 60 at time T3.
- the operation of the chiller 100 is stopped. That is, the chiller operation signal and the pump operation signal are turned off, the circulation pump 300 is stopped in the circulating fluid circuit 200, and the compressor 10 is stopped in the refrigerant circuit 110 by performing an engine stop sequence.
- the conditions (a) to (c) are satisfied again after the operation of the chiller 100 as described above is stopped, the operation of the chiller 100 is resumed by the same sequence as that at the time of activation.
- the detected temperature becomes below predetermined temperature (for example, 2 degreeC)
- predetermined temperature for example, 2 degreeC
- the compressor 10 is stopped and the circulation pump 300 is not stopped. If the temperature detected by the temperature sensor falls below a specified temperature (for example, 2 ° C), this indicates that the circulating fluid temperature is approaching the freezing temperature. It is to do.
- the detected temperature being equal to or lower than the predetermined temperature means that even one of the temperature sensors has a detected temperature equal to or lower than the predetermined temperature. And that the detected temperature exceeds the predetermined temperature means that the detected temperature of all the temperature sensors exceeds the predetermined temperature.
- the pump power supply circuit is turned off and the compressor 10 is stopped.
- the thermal relay 421 is turned off during the operation of the chiller 100, it is determined that the circulation pump 300 is in an overload state. In this case, the pump power supply circuit is turned off and the compressor 10 is stopped.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
Description
(1)循環ポンプが正常に駆動していることを示す信号、
(2)循環液の温度監視が正常に行えていることを示す信号、および
(3)循環ポンプが過負荷状態となっていないことを示す信号であり、前記所定時間内に前記所定信号の何れか一つでも受信しない場合には、前記循環ポンプの給電回路をオフすると共に、前記圧縮機の起動を中止する構成とすることができる。
(a)フロースイッチ411がオンである(循環ポンプ300が正常に駆動している)。
(b)第1接続リレー412がオンである(循環液の温度監視が正常に行えている)。
(c)サーマルリレー421がオンである(循環ポンプ300が過負荷状態となっていない)。
20 冷媒-空気熱交換器
30 冷媒-空気熱交換器用ファン
40 膨張弁
50 冷媒-循環液熱交換器
60 エンジン
100 ヒートポンプ式チラー
110 冷媒回路
140 制御装置(制御部)
200 循環液回路
300 循環ポンプ
301 モータ
400 コントローラ・電源部
410 制御ボックス
411 フロースイッチ
412 第1接続リレー
413 第2接続リレー
414 第1接続リレー
420 ポンプユニット
421 サーマルリレー
TWR 流入循環液温度センサ
TWL 流出循環液温度センサ
TWS 熱交換器表面温度センサ
Claims (3)
- 冷媒を、圧縮機、冷媒-空気熱交換器、膨張弁および冷媒-循環液熱交換器の順で循環させることによって冷凍サイクルを実行する冷媒回路と、前記冷媒-循環液熱交換器での熱交換によって冷却される循環液を循環させる循環液回路とを備え、前記循環液回路に循環ポンプを設けたヒートポンプ式チラーにおいて、
当該ヒートポンプ式チラーの起動時には、前記循環ポンプの給電回路をオンした後、当該ヒートポンプ式チラーの制御部が、所定時間内に上記循環液回路が正常運転されていることを示す所定信号を受信した場合に、前記圧縮機を起動し、
前記制御部が、前記所定時間内に前記所定信号を受信しない場合には、前記循環ポンプの給電回路をオフすると共に、前記圧縮機の起動を中止することを特徴とするヒートポンプ式チラー。 - 請求項1に記載のヒートポンプ式チラーにおいて、
前記所定信号とは、
(1)循環ポンプが正常に駆動していることを示す信号、
(2)循環液の温度監視が正常に行えていることを示す信号、および
(3)循環ポンプが過負荷状態となっていないことを示す信号であり、
前記所定時間内に前記所定信号の何れか一つでも受信しない場合には、前記循環ポンプの給電回路をオフすると共に、前記圧縮機の起動を中止することを特徴とするヒートポンプ式チラー。 - 請求項1または2に記載のヒートポンプ式チラーにおいて、
前記循環液回路における循環液の流れを検知してオンとなるフロースイッチと、前記循環ポンプが所定温度以上になった場合にオフとなるサーマルリレーとを設け、
前記循環液回路における循環液の蒸発器入口部、蒸発器出口部および蒸発器表面部にそれぞれ温度センサを設け、
前記制御部が、前記フロースイッチまたは前記サーマルリレーの何れか一つでもオフとなったことを検出した場合には、前記循環ポンプの給電回路をオフすると共に、前記圧縮機を停止し、
前記3つの温度センサによる検知温度のいずれか一つが所定温度以下であることを検知した場合には、前記循環ポンプの給電回路のオンを維持しながら、前記圧縮機を停止することを特徴とするヒートポンプ式チラー。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2015282159A AU2015282159B2 (en) | 2014-06-24 | 2015-05-18 | Heat pump type chiller |
| KR1020167032900A KR20160146969A (ko) | 2014-06-24 | 2015-05-18 | 히트 펌프식 칠러 |
| EP15811744.0A EP3163220B1 (en) | 2014-06-24 | 2015-05-18 | Heat pump type chiller |
| CN201580033931.4A CN106461282B (zh) | 2014-06-24 | 2015-05-18 | 热泵式冷却装置 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-129488 | 2014-06-24 | ||
| JP2014129488A JP6342727B2 (ja) | 2014-06-24 | 2014-06-24 | ヒートポンプ式チラー |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2015198751A1 true WO2015198751A1 (ja) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2015/064167 Ceased WO2015198751A1 (ja) | 2014-06-24 | 2015-05-18 | ヒートポンプ式チラー |
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| EP (1) | EP3163220B1 (ja) |
| JP (1) | JP6342727B2 (ja) |
| KR (1) | KR20160146969A (ja) |
| CN (1) | CN106461282B (ja) |
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| WO (1) | WO2015198751A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218020A (zh) * | 2021-05-19 | 2021-08-06 | 济南朗仕环境科技有限公司 | 一种智能化新风系统自动启停温控系统 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11988421B2 (en) | 2021-05-20 | 2024-05-21 | Carrier Corporation | Heat exchanger for power electronics |
| JP2023157663A (ja) * | 2022-04-15 | 2023-10-26 | 東芝キヤリア株式会社 | 熱源ユニット |
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| Publication number | Publication date |
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| CN106461282A (zh) | 2017-02-22 |
| EP3163220B1 (en) | 2020-09-16 |
| AU2015282159A1 (en) | 2017-01-12 |
| EP3163220A4 (en) | 2017-06-14 |
| EP3163220A1 (en) | 2017-05-03 |
| AU2015282159B2 (en) | 2018-11-08 |
| JP6342727B2 (ja) | 2018-06-13 |
| JP2016008775A (ja) | 2016-01-18 |
| KR20160146969A (ko) | 2016-12-21 |
| CN106461282B (zh) | 2019-04-23 |
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