EP4027076A1 - Dispositif à cycle frigorifique - Google Patents

Dispositif à cycle frigorifique Download PDF

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Publication number
EP4027076A1
EP4027076A1 EP20860598.0A EP20860598A EP4027076A1 EP 4027076 A1 EP4027076 A1 EP 4027076A1 EP 20860598 A EP20860598 A EP 20860598A EP 4027076 A1 EP4027076 A1 EP 4027076A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
water
water heat
outdoor
units
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20860598.0A
Other languages
German (de)
English (en)
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EP4027076A4 (fr
Inventor
Ryoko MATSUYAMA
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Toshiba Carrier Corp
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Toshiba Carrier Corp
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Publication date
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Publication of EP4027076A1 publication Critical patent/EP4027076A1/fr
Publication of EP4027076A4 publication Critical patent/EP4027076A4/fr
Pending legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/06—Damage
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/31—Low ambient temperatures
    • 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

Definitions

  • Embodiments of the present invention relate to a refrigeration cycle device provided with an outdoor unit, an indoor unit, and a water heat exchange unit.
  • a refrigeration cycle device (also referred to as a heat pump type heat source device) comprising a heat pump type refrigeration cycle in which a compressor and an outdoor heat exchanger of an outdoor unit, an indoor heat exchanger of an indoor unit, and a water heat exchanger of a water heat exchange unit, etc., are connected by piping, is known.
  • this refrigeration cycle device is capable of performing a cold water supply operation, in which cold water is supplied, and a hot water supply operation, in which hot water is supplied, from the water heat exchange unit to a load (a radiator or a hot water tank).
  • frost gradually adheres to the surface of the outdoor heat exchanger that functions as an evaporator, and the heat exchange amount of the outdoor heat exchanger gradually decreases if no measures are taken.
  • the above-mentioned refrigeration cycle device periodically or as necessary executes a defrosting operation, in which a discharge refrigerant (high temperature refrigerant) of the compressor is directly supplied to the outdoor heat exchanger during the heating operation and the hot water supply operation.
  • the above-mentioned refrigeration cycle device operates the pump of the water heat exchange unit to distribute water to the water heat exchanger in the case where the temperature of the water heat exchanger drops to or below a set value, thereby executing a freeze prevention operation to prevent the water heat exchanger from freezing.
  • Patent Literature 1 JP 2004-353903 A
  • the power supply of an unused water heat exchange unit may be cut off by a user. Even if the refrigerant after defrosting flows into the water heat exchanger of the unused water heat exchange unit and the temperature of the water heat exchanger drops, in a state where the power supply of the water heat exchange unit is cut off, the pump cannot execute the freeze prevention operation. There is a possibility that the water in the water heat exchanger may freeze without being able to execute the freeze prevention operation.
  • Embodiments described herein aim to provide a refrigeration cycle device with excellent safety that can prevent the water in the water heat exchanger from freezing.
  • a refrigeration cycle device of one embodiment comprising; an outdoor unit including a compressor, an outdoor heat exchanger, and an outdoor controller; an indoor unit including an indoor heat exchanger; and a water heat exchange unit including a water heat exchanger, a pump that circulates water between a water flow path of the water heat exchanger and a load, and a water heat controller, and operated by a power supply that is different from power supplies of the outdoor unit and the indoor unit.
  • the water heat exchange controller operates the pump in a case where a temperature of the water heat exchanger is below a set value.
  • the outdoor controller permits operation of the refrigeration cycle device in a case where the number of operable units of the water heat exchange unit reaches a specified number of units, and prohibits operation of the refrigeration cycle device in a case where the number of operable units of the water heat exchange unit does not reach the specified number of units.
  • one end of a plurality of indoor heat exchangers 11 and one end of a refrigerant flow path 21a in a plurality of water heat exchangers 21 are pipe-connected to a discharge port of a compressor 1 via a four-way valve 2, and the other end of each indoor heat exchanger 11 and the other end of the refrigerant flow path 21a in each water heat exchanger 21 are pipe-connected to one end of an expansion valve (pressure reducer) 3 via a flow control valve (first flow control valve) 12 and a flow control valve (second flow control valve) 22, respectively.
  • an outdoor heat exchanger 4 is pipe-connected to the other end of the expansion valve 3, and the other end of the outdoor heat exchanger 4 is pipe-connected to a suction port of the compressor 1 via the above four-way valve 2 and an accumulator 5.
  • the heat pump type refrigeration cycle is configured by connecting these pipes.
  • Each flow control valve 12 is a pulse motor valve (PMV) whose opening degree varies continuously from fully closed to fully open in accordance with the number of drive pulse voltages supplied, and its opening degree variation adjusts the flow rate of refrigerant to the indoor heat exchanger 11.
  • Each flow control valve 22 is also a pulse motor valve (PMV) whose opening degree varies continuously from fully closed to fully open in accordance with the number of drive pulse voltages supplied, and its opening degree variation adjusts the flow rate of refrigerant to the refrigerant flow path 21a of each water heat exchanger 21.
  • a small amount of refrigerant may leak and flow from the respective flow control valves 12 and 22 to the indoor heat exchanger 11 side and the water heat exchanger 21 side even when the respective flow control valves 12 and 22 are fully closed.
  • a gas refrigerant discharged from the compressor 1 flows through the four-way valve 2 to each indoor heat exchanger 11.
  • the gas refrigerant flowing into each indoor heat exchanger 11 is condensed by losing heat to indoor air.
  • the liquid refrigerant flowing out of each indoor heat exchanger 11 passes through each flow control valve 12, is further depressurized by the expansion valve 3, and flows into the outdoor heat exchanger 4.
  • the liquid refrigerant flowing into the outdoor heat exchanger 4 draws heat from the outside air and vaporizes.
  • the gas refrigerant flowing out of the outdoor heat exchanger 4 is sucked into the compressor 1 through the four-way valve 2 and the accumulator 5. That is, a refrigerant flow path (also referred to as a heating cycle) is formed in which each indoor heat exchanger 11 functions as a condenser and the outdoor heat exchanger 4 functions as an evaporator.
  • a gas refrigerant discharged from the compressor 1 flows through the four-way valve 2 into the refrigerant flow path 21a of each water heat exchanger 21.
  • the gas refrigerant flowing in each refrigerant flow path 21a is condensed by losing heat to water flowing in each water flow path 21b.
  • the liquid refrigerant flowing out of each refrigerant flow path 21a passes through each flow control valve 22, is further depressurized by the expansion valve 3, and flows into the outdoor heat exchanger (evaporator) 4.
  • the liquid refrigerant flowing into the outdoor heat exchanger 4 draws heat from the outside air and vaporizes.
  • a refrigerant flow path (also referred to as a hot water supply cycle) is formed in which the refrigerant flow path 21a of each water heat exchanger 21 functions as a condenser and the outdoor heat exchanger 4 functions as an evaporator.
  • the flow path of the four-way valve 2 is switched, and the gas refrigerant discharged from the compressor 1 flows through the four-way valve 2 into the outdoor heat exchanger 4.
  • the gas refrigerant flowing in the outdoor heat exchanger 4 is condensed by releasing heat to the outside air.
  • the liquid refrigerant flowing out of the outdoor heat exchanger 4 is depressurized by the expansion valve 3 and further flows through each flow control valve 12 to each indoor heat exchanger 11.
  • the liquid refrigerant flowing in each indoor heat exchanger 11 vaporizes by taking heat from the indoor air.
  • the gas refrigerant flowing out of each indoor heat exchanger 11 is sucked into the compressor 1 through the four-way valve 2 and the accumulator 5. That is, a refrigerant flow path (also referred to as a cooling cycle) is formed in which the outdoor heat exchanger 4 functions as a condenser and each indoor heat exchanger 11 functions as an evaporator.
  • the flow path of the four-way valve 2 is switched so that a gas refrigerant discharged from the compressor 1 flows through the four-way valve 2 to the outdoor heat exchanger 4.
  • the gas refrigerant flowing in the outdoor heat exchanger 4 is condensed by releasing heat to the outside air.
  • the liquid refrigerant flowing out of the outdoor heat exchanger 4 is depressurized by the expansion valve 3 and further flows through each flow control valve 22 to the refrigerant flow path 21a of each water heat exchanger 21.
  • the liquid refrigerant flowing in each refrigerant flow path 21a vaporizes by taking heat from the water flowing in each water flow path 21b.
  • each refrigerant flow path 21a is sucked into the compressor 1 through the four-way valve 2 and the accumulator 5. That is, a refrigerant flow path (also referred to as a cold water supply cycle) is formed in which the outdoor heat exchanger 4 functions as a condenser and the refrigerant flow path 21a of each water heat exchanger 21 functions as an evaporator.
  • a refrigerant flow path also referred to as a cold water supply cycle
  • an outdoor fan 6 is arranged to suck in outdoor air and pass it through the outdoor heat exchanger 4, and an outdoor air temperature sensor 7 is arranged to detect a temperature To of the air (outdoor air) sucked in by the outdoor fan 6.
  • a heat exchanger temperature sensor 8 to detect a temperature Tc of the outdoor heat exchanger 4 is attached to the outdoor heat exchanger 4.
  • An indoor fan 13 and an indoor temperature sensor 14 are respectively disposed in the vicinity of each indoor heat exchanger 11. Each indoor fan 13 sucks in indoor air and passes the sucked air through each indoor heat exchanger 11. Each indoor temperature sensor 14 detects a temperature (indoor temperature) Ta of the air sucked in by each indoor fan 13.
  • Each water heat exchanger 21 exchanges heat between refrigerant that passes through the refrigerant flow path 21a and water that passes through the water flow path 21b.
  • the inlet of each water flow path 21b is connected to the water flow outlet of loads L1 to Ln via a water pipe 23 and a pump 24 arranged in the water pipe 23, respectively.
  • the loads L1 to Ln are, for example, radiators and hot water tanks.
  • the outlets of each water flow path 21b are connected to the water flow inlets of the loads L1 to Ln via water pipes 25, respectively. With the operation of each pump 24, the water contained in the loads L1 to Ln circulates through each water pipe 23, each water flow path 21b, and each water pipe 25.
  • An electric heater 26 is disposed between where each pump 24 is disposed in each water pipe 23 and the inlet of each water flow path 21b, respectively, as an auxiliary heat source to heat the water.
  • a water temperature sensor 27 to detect a temperature Tw of the water is respectively attached to the outlet of each water flow path 21b.
  • the above-mentioned outdoor unit 1, four-way valve 2, expansion valve 3, outdoor heat exchanger 4, accumulator 5, outdoor fan 6, outdoor air temperature sensor 7, and heat exchanger temperature sensor 8 are housed in an outdoor unit A together with an outdoor controller 10.
  • the outdoor unit A is connected to an AC power supply (first power supply) 30 for the outdoor unit via a power line 31 and a power switch 32 inserted and connected to the power line 31.
  • an AC voltage of the AC power supply 30 is supplied to the outdoor unit A.
  • the supply of this power voltage enables the operation of the outdoor unit A, including the operation of the outdoor controller 10.
  • Each of the above-mentioned indoor heat exchangers 11, each of the above-mentioned flow control valves 12, each of the above-mentioned indoor fans 13, and each of the above-mentioned indoor temperature sensors 14, together with each indoor controller 15, are housed in a plurality of indoor units B1, B2, ... Bn, respectively.
  • These indoor units B1 to Bn are connected to an AC power supply (second power supply) 40 for indoor units via a power line 41 and power switches 42a to 42n inserted and connected to the power line 41, respectively.
  • an AC voltage of the AC power supply 40 is supplied to the indoor units B1 to Bn, respectively.
  • the supply of this power voltage enables the operation of the indoor units B1 to Bn, including the operation of the respective indoor controllers 15, respectively.
  • An operation indicator 15a is connected to each indoor controller 15, respectively.
  • These operation indicators 15a include an operation button for designating the start and stop of operation, an operation button for an indoor set temperature Ts, and a display screen for displaying an operation status and the like by text or images.
  • Each of the above-mentioned water heat exchangers 21, each of the above-mentioned water pipes 23, each of the above-mentioned pumps 24, each of the above-mentioned water pipes 25, each of the above-mentioned heaters 26, and each of the above-mentioned water temperature sensors 27, together with each water heat controller 28, are housed in a plurality of water heat exchange units C1 to Cn, respectively.
  • the water heat exchange units C1 to Cn are connected to an AC power supply (third power supply) 50 for water heat exchange units via a power line 51 and power switches 52a to 52n inserted and connected to the power line 51, respectively.
  • the AC voltage of the AC power supply 50 is supplied to the water heat exchange units C1 to Cn, respectively.
  • the supply of this power voltage enables the operation of the water heat exchange units C1 to Cn, including the operation of each water heat controller 28, respectively.
  • An operation indicator 28a is connected to each of the water heat controllers 28, respectively.
  • These operation indicators 28a include an operation button for designating the start and stop of operation, an operation button for a water setting temperature Tws for the water heat exchange units C1 to Cn, and a display screen for displaying an operation status and the like by text or images.
  • a multi-type refrigeration cycle device (also referred to as a heat pump type heat source device) is configured in which indoor units B1 to Bn and water heat exchange units C1 to Cn are connected in parallel to the outdoor unit A.
  • the outdoor controller 10 of the outdoor unit A comprehensively controls the operation of the outdoor unit A, the operation of the indoor units B1 to Bn, and the operation of the water heat exchange units C1 to Cn in response to the user operation of each operation indicator 15a and each operation indicator 28a, and includes as its main functions a first control section 10a, a second control section 10b, a third control section 10c, a fourth control section 10d, and a fifth control section 10e.
  • the first control section 10a forms a refrigerant flow path (heating cycle) in which each indoor heat exchanger 11 functions as a condenser and the outdoor heat exchanger 4 functions as an evaporator during the heating operation of the indoor units B1 to Bn.
  • the first control section 10a forms a refrigerant flow path (hot water supply cycle) in which the refrigerant flow path 21a of each water heat exchanger 21 functions respectively as a condenser and the outdoor heat exchanger 4 functions as an evaporator during the hot water supply operation in which hot water is supplied from the water heat exchange units C1 to Cn to the loads L1 to Ln.
  • the second control section 10b forms a refrigerant flow path (cooling cycle) in which the outdoor heat exchanger 4 functions as a condenser and each indoor heat exchanger 11 functions as an evaporator during the cooling operation of the indoor units B1 to Bn.
  • the second control section 10b forms a (cold water supply cycle) in which the outdoor heat exchanger 4 functions as a condenser and the refrigerant flow path 21a of each water heat exchanger 21 functions respectively as an evaporator during the cold water supply operation in which cold water is supplied from the water heat exchange units C1 to Cn to the loads L1 to Ln.
  • the third control section 10c detects, during the above-mentioned heating operation and the above-mentioned hot water supply operation, the amount of frost on the outdoor heat exchanger 4 based on the temperature (evaporation temperature) Tc of the outdoor heat exchanger 4 detected by the heat exchanger temperature sensor 8.
  • the refrigerant flow direction is switched to a defrosting cycle that is the same as the cooling cycle and the cold water supply cycle, which are opposite to the heating cycle and the hot water supply cycle, and the defrosting operation is executed in which a discharge refrigerant (high temperature refrigerant) of the compressor 1 flows directly into the outdoor heat exchanger 4 through the four-way valve 2 to remove the frost on the outdoor heat exchanger 4 by the heat of the refrigerant.
  • This defrosting operation is continued until the amount of frost decreases to less than the specified amount or until a certain time elapses.
  • the fourth control section 10d communicates mutually with each indoor controller 15 of the indoor units B1 to Bn and each water heat controller 28 of the water heat exchange units C1 to Cn via a communication line 60 to detect a control address of each indoor controller 15, a control address of each water heat controller 28, the capacity (horsepower) of the indoor units B1 to Bn, the capacity (horsepower) of the water heat exchange units C1 to Cn, the number of water heat exchange units C1 to Cn (also referred to as the number of connected units) Ns, etc., and stores these detection results as control data in an internal memory of the outdoor controller 10.
  • the power switch 32 of the outdoor unit A since the power switch 32 of the outdoor unit A, the power switches 42a to 42n of the indoor units B1 to Bn, and the power switches 52a to 52n of the water heat exchange units C1 to Cn are all turned on by a worker, the number of units Ns of all of the water heat exchange units C1 to Cn for which installation has been completed is detected, and the detection result is stored in the internal memory of the outdoor controller 10 as the specified number of units Ns.
  • the fifth control section 10e communicates mutually with each water heat controller 28 of the water heat exchange units C1 to Cn via the communication line 60 to detect the number of operable water heat exchange units C1 to Cn (that is, the number of water heat controllers 28 that can be operated) N, and compares the detected number of operable units N with the specified number of units Ns stored at the trial operation. In the case where the number of operable units N reaches the specified number of units Ns, the operation of the refrigeration cycle device including the outdoor unit A is permitted, and in the case where the number of operable units N is less than the specified number of units Ns, the operation of the refrigeration cycle device including the outdoor unit A is prohibited.
  • Each indoor controller 15 of the indoor units B1 to Bn executes the control shown in the flowchart of FIG. 2 .
  • S1, S2... in the flowchart indicate the steps of the process.
  • each indoor controller 15 notifies the outdoor controller 10 via the communication line 60 of the required capacity of the indoor units B1 to Bn corresponding to the difference between a detected temperature Ta of each indoor temperature sensor 14 and the indoor set temperature Ts (S2). Then, each indoor controller 15 controls the refrigerant flow rate to each indoor heat exchanger 11, that is, the opening degree of each flow control valve 12, so that the detected temperature Ta of each indoor temperature sensor 14 becomes the indoor set temperature Ts (S3).
  • Each water heat controller 28 of water heat exchange units C1 to Cn executes the control shown in the flowchart of FIG. 3 .
  • each water heat controller 28 opens each flow control valve 12 to form a refrigerant flow path to each water heat exchanger 21 (S12), and operates each pump 24 to circulate water between the water flow path 21b of each water heat exchanger 21 and the load (S13). Furthermore, each water heat controller 28 detects a temperature Tw of the water flowing out of the water flow path 21b of each water heat exchanger 21 with each water temperature sensor 27, and controls the water delivery rate of each pump 24 so that the detected temperature Tw becomes the water setting temperature Tws (S14). Then, each water heat controller 28 monitors the presence or absence of the defrosting operation by communicating with the outdoor controller (S15).
  • the defrosting operation is performed periodically or as needed during the hot water supply operation, but not during the cold water supply operation.
  • the defrosting operation is executed during the hot water supply operation, the refrigerant after defrosting the outdoor heat exchanger 4 flows into each water heat exchanger 11 through each flow control valve 12 in the open state, thus lowering the temperature Tw of each water heat exchanger 11.
  • each water heat controller 28 In the case where the defrosting operation is not in progress (NO in S15), each water heat controller 28 returns to the determination in S11 above. In the case where the defrosting operation is in progress (YES in S15), each water heat controller 28 compares the detected temperature Tw of each water temperature sensor 27 with a set value Tws for freeze prevention (S16) .
  • each water heat controller 28 stops each pump 24 (S17). By stopping each pump 24, unnecessary cold water will not be supplied from each water heat exchanger 21 to the loads L1 to Ln. Subsequently, each water heat controller 28 returns to the determination in S11 above.
  • each water heat controller 28 operates each pump 24 at a predetermined water delivery rate to prevent each water heat exchanger 21 from freezing (S18).
  • the water delivery rate of each pump 24 at this time is only to prevent freezing; therefore, a small amount that would not cause cold water to be supplied to the loads L1 to Ln is sufficient.
  • This freeze prevention operation prevents the water heat exchanger 21 from freezing. Subsequently, each water heat controller 28 returns to the determination in S11 above.
  • each water heat controller 28 In the determination in S11 above, during, for example, the heating operation (NO in S11), which is neither the hot water supply operation nor the cold water supply operation, each water heat controller 28 fully closes each flow control valve 12 to prevent a refrigerant from flowing into each water heat exchanger 21 (S19). Then, each water heat controller 28 moves on to S16 above and compares the detected temperature Tw of each water temperature sensor 27 with the set value Tws for freeze prevention (S16).
  • each water heat controller 28 stops each pump 24 (S17). By stopping each pump 24, unnecessary cold water will not be supplied from each water heat exchanger 21 to the loads L1 to Ln. Subsequently, each water heat controller 28 returns to the determination in S11 above.
  • each water heat controller 28 operates each pump 24 at a predetermined water delivery rate to prevent each water heat exchanger 21 from freezing (S18).
  • the water delivery rate of each pump 24 at this time is only to prevent freezing; therefore, a small amount that would not cause cold water to be supplied to the loads L1 to Ln is sufficient. This freeze prevention operation prevents the water heat exchanger 21 from freezing. Subsequently, each water heat controller 28 returns to the decision of S11 above.
  • the outdoor controller 10 of the outdoor unit A determines whether the operation mode is a trial operation after the installation is completed (S22) .
  • the outdoor controller 10 executes mutual communication with each water heat controller 28 of the water heat exchange units C1 to Cn via the communication line 60 (S23), detects the number of units Ns of all water heat exchange units C1 to Cn whose installation has been completed (also referred to as the number of connected units) through this mutual communication (S24), and stores the detection result as the specified number of units Ns in the internal memory (S25).
  • the outdoor controller 10 then returns to the determination in S22 above if the AC power supply 30 is not shut off by the off operation of the power switch 32 (NO in S26).
  • the outdoor controller 10 executes mutual communication with each water heat controller 28 of the water heat exchange units C1 to Cn via the communication line 60 (S27), detects the number of operable units N of the water heat exchange units C1 to Cn (that is, the number of operable water heat controllers 28) through this mutual communication (S28), and compares the detected number of operable units N with the above-mentioned specified number of units Ns stored at the time of the trial operation (S29) .
  • the outdoor controller 10 permits the operation of the outdoor unit A (S30). Due to this permission, the execution of all the operations such as heating operation, hot water supply operation, cooling operation, and cold water supply operation becomes possible in response to the operation of the operation indicator 15a or the operation indicator 28a. The outdoor controller 10 then returns to the determination in S22 above if the AC power supply 30 is not shut off by the off operation of the power switch 32 (NO in S26) .
  • the outdoor controller 10 prohibits the operation of the refrigeration cycle device including the outdoor unit A and informs the user of the prohibition and the cause thereof by the displays of the respective operation indicators 15a and 28a (S31).
  • This prohibition of the operation makes it impossible to execute all the operations such as the heating operation, the hot water supply operation, the cooling operation, and the cold water supply operation.
  • the outdoor controller 10 then returns to the determination of S22 above if the AC power supply 30 is not shut off by the off operation of the power switch 32 (NO in S26) .
  • the operation of one or more units among the water heat exchange units C1 to Cn may be unnecessary and stopped.
  • the power switch 52a of the water heat exchange unit to be stopped for example, the water heat exchange unit C1
  • the power switch 52a of the water heat exchange unit to be stopped may be turned off by the user, and the supply of power voltage to the water heat exchange unit C1 may be cut off.
  • the heating operation of the indoor units B1 to Bn and the hot water supply operation of the other water heat exchange units C2 to Cn may be started while the power switch 52a of the water heat exchange unit C1 remains turned off.
  • the operation of the flow control valve 22, the operation of the pump 24, the operation of the electric heater 26, and the operation of the water heat controller 28 are stopped in the water heat exchange unit C1 where the supply of the power voltage is cut off.
  • the heating operation of the indoor units B1 to Bn and the hot water supply operation of the other water heat exchange units C2 to Cn proceed as is, and the outdoor heat exchanger 4 becomes frosted and the defrosting operation for the outdoor heat exchanger 4 is executed, even if the flow control valve 22 of the water heat exchange unit C1 is fully closed, the refrigerant after defrosting may flow from the flow control valve 22 to the refrigerant flow path 21a side of the water heat exchanger 21.
  • the operation of the water heat controller 28 is stopped, and the number of operable units N of the water heat exchange units C1 to Cn becomes less than the specified number of units Ns. Therefore, the operation of the refrigeration cycle device including the outdoor unit A is prohibited. That is, not only the heating operation and the hot water supply operation, but also the defrosting operation is prohibited. Therefore, the water in the water heat exchanger 21 in the water heat exchange unit C1 can be prevented from freezing. As a result, the water heat exchanger 21 can be prevented from bursting due to the progress of freezing.
  • the user can recognize that the operation of the refrigeration cycle device including the outdoor unit A has been prohibited and the cause thereof by the displays of the respective operation indicators 15a and 28a. Based on this recognition, the user can turn on the power switch 52a of the water heat exchange unit C1 and also turn off the power switch 32 of the outdoor unit A and then turn it on again. From this point onward, the number of operable units N of the water heat exchange units C1 to Cn becomes equal to the specified number of units Ns, and all of the refrigeration cycle units including the outdoor unit A are permitted to operate.
  • the configuration is such that the specified number of units Ns is detected and stored by the communication of the outdoor controller 10 during the trial operation.
  • the number of installed units C1 to Cn can be checked by a worker, and the number can be entered and stored in the outdoor controller 10 as the specified number of units Ns by operating the operation indicator 15a or 28a.
  • the number of operable units N of the water heat exchange units C1 to Cn is detected when the power switch 32 of the outdoor unit A is turned on; however, a configuration may also be adopted in which the number of operable units N of the water heat exchange units C1 to Cn is detected at each start of the operation of the outdoor unit A.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Air Conditioning Control Device (AREA)
EP20860598.0A 2019-09-05 2020-08-24 Dispositif à cycle frigorifique Pending EP4027076A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019162172 2019-09-05
PCT/JP2020/031827 WO2021044886A1 (fr) 2019-09-05 2020-08-24 Dispositif à cycle frigorifique

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EP4027076A1 true EP4027076A1 (fr) 2022-07-13
EP4027076A4 EP4027076A4 (fr) 2023-10-11

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JP (1) JP7259058B2 (fr)
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JP3642609B2 (ja) * 1995-06-30 2005-04-27 東芝キヤリア株式会社 空気調和機
JP2000028185A (ja) * 1998-07-13 2000-01-25 Toshiba Corp 空気調和装置
JP2002349940A (ja) 2001-05-30 2002-12-04 Matsushita Electric Ind Co Ltd 空気調和システム
JP2004353903A (ja) 2003-05-28 2004-12-16 Sanyo Electric Co Ltd 空気調和装置
JP2006194526A (ja) * 2005-01-14 2006-07-27 Sanyo Electric Co Ltd 空気調和装置
US8657207B2 (en) * 2008-08-26 2014-02-25 Lg Electronics Inc. Hot water circulation system associated with heat pump and method for controlling the same
JP2010210164A (ja) * 2009-03-11 2010-09-24 Panasonic Corp 多室形空気調和機の運転制御方法
ES2803240T3 (es) * 2009-09-18 2021-01-25 Mitsubishi Electric Corp Dispositivo de aire acondicionado
CN102753895B (zh) * 2010-02-15 2015-07-15 东芝开利株式会社 致冷单元
JP5425282B1 (ja) * 2012-08-31 2014-02-26 三菱電機株式会社 遠隔制御システム、システムコントローラ及びプログラム
JP2014077560A (ja) * 2012-10-09 2014-05-01 Fujitsu General Ltd 空気調和装置
WO2014091548A1 (fr) * 2012-12-11 2014-06-19 三菱電機株式会社 Système composite de climatisation et d'approvisionnement d'eau chaude
JP2017142038A (ja) * 2016-02-12 2017-08-17 三菱重工サーマルシステムズ株式会社 冷凍サイクル装置
WO2017195294A1 (fr) * 2016-05-11 2017-11-16 三菱電機株式会社 Dispositif à cycle frigorifique
GB2567331B (en) * 2016-08-04 2021-01-13 Mitsubishi Electric Corp Heat source system

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CN114341558B (zh) 2023-08-08
JPWO2021044886A1 (fr) 2021-03-11
WO2021044886A1 (fr) 2021-03-11
CN114341558A (zh) 2022-04-12
EP4027076A4 (fr) 2023-10-11
JP7259058B2 (ja) 2023-04-17

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