WO2021009924A1 - Dispositif de climatisation - Google Patents

Dispositif de climatisation Download PDF

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Publication number
WO2021009924A1
WO2021009924A1 PCT/JP2019/028359 JP2019028359W WO2021009924A1 WO 2021009924 A1 WO2021009924 A1 WO 2021009924A1 JP 2019028359 W JP2019028359 W JP 2019028359W WO 2021009924 A1 WO2021009924 A1 WO 2021009924A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
condition
refrigerant
satisfied
air conditioner
Prior art date
Application number
PCT/JP2019/028359
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English (en)
Japanese (ja)
Inventor
端之 松下
康敬 落合
尚弘 市川
勝也 谷口
Original Assignee
三菱電機株式会社
三菱電機ビルテクノサービス株式会社
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by 三菱電機株式会社, 三菱電機ビルテクノサービス株式会社 filed Critical 三菱電機株式会社
Priority to JP2021532659A priority Critical patent/JPWO2021009924A1/ja
Priority to PCT/JP2019/028359 priority patent/WO2021009924A1/fr
Publication of WO2021009924A1 publication Critical patent/WO2021009924A1/fr
Priority to JP2023123171A priority patent/JP2023156370A/ja

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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
    • F24F11/30—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
    • 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

Definitions

  • the present invention relates to an air conditioner.
  • Patent Document 1 a temperature installed on the side surface of a plate heat exchanger is provided in order to prevent freezing of water in a plate heat exchanger in which a refrigerant and water exchange heat.
  • An air conditioner that stops the operation of a compressor when the value of the sensor becomes equal to or less than a predetermined value is disclosed.
  • the distribution of the refrigerant may be biased in the heat exchanger where heat is exchanged between the refrigerant and water.
  • the locally distributed refrigerant in the heat exchanger facilitates cooling of the water in the vicinity of the refrigerant.
  • the heat exchanger may be damaged due to the expansion of the volume of water due to solidification.
  • the refrigerant in the plate heat exchanger may accumulate near the inlet of the refrigerant in each plate.
  • freezing of water due to the local distribution of the refrigerant when the compressor is stopped is not considered.
  • the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent a failure of an air conditioner due to freezing of water.
  • the air conditioner according to the present invention includes a first cycle unit, a second cycle unit, and a control device.
  • the first cycle unit the first refrigerant circulates in the first circulation direction of the compressor, the first heat exchanger, the decompression device, and the second heat exchanger.
  • the second cycle unit the second refrigerant containing water circulates in the order of the pump, the second heat exchanger, and the load device.
  • the control device controls the first cycle unit and the second cycle unit.
  • the first cycle unit includes a switching valve connected between the discharge port of the compressor and the second heat exchanger.
  • the control device controls the switching valve to transfer the first refrigerant from the discharge port of the compressor to the first refrigerant without going through the first heat exchanger and the decompression device. 2 Supply to the heat exchanger.
  • the first refrigerant from the discharge port of the compressor is transferred to the second heat exchanger without going through the first heat exchanger and the decompression device.
  • the first refrigerant from the discharge port of the compressor is transferred to the second heat exchanger without going through the first heat exchanger and the decompression device.
  • FIG. 1 is a diagram showing the configuration of the air conditioner 100 according to the first embodiment, and the flow of the refrigerant (first refrigerant) and the flow of water (second refrigerant) in the cooling operation.
  • FIG. 2 is a diagram showing the configuration of the air conditioner 100 according to the first embodiment, and the flow of the refrigerant and the flow of water in the heating operation.
  • the air conditioner 100 includes a refrigerant circuit 1 (first cycle unit) in which a refrigerant circulates, a water circuit 2 (second cycle unit) in which water circulates, and a control device 3. To be equipped.
  • the control device 3 controls the refrigerant circuit 1 and the water circuit 2.
  • the refrigerant circuit 1 includes a compressor 11, a four-way valve 12 (switching valve), an outdoor heat exchanger 13 (first heat exchanger), an outdoor fan 14, a decompression device 15, and a heat exchanger 16 (second heat exchanger).
  • a heat exchanger) and an accumulator 17 are provided.
  • Each configuration included in the refrigerant circuit 1 is connected by a refrigerant pipe to form a heat source machine.
  • the refrigerant circuit 1 is arranged outside the room.
  • the heat exchanger 16 has ports P1 to P4.
  • the compressor 11 adiabatically compresses the refrigerant to increase the pressure of the refrigerant and discharges the refrigerant, and circulates the refrigerant in the refrigerant circuit 1.
  • the control device 3 changes the drive frequency (compressor frequency) according to the operating condition of the air conditioner 100, thereby changing the amount of refrigerant (operating capacity) discharged by the compressor 11 per unit time.
  • the motor inside the compressor 11 is controlled by an inverter (not shown).
  • the accumulator 17 separates a liquid refrigerant (liquid refrigerant) and a gaseous refrigerant (gas refrigerant). By storing the excess liquid refrigerant in the accumulator 17, it is possible to prevent the liquid refrigerant from being sucked into the compressor 11.
  • the four-way valve 12 switches the circulation direction of the refrigerant between the heating operation and the cooling operation.
  • the four-way valve 12 communicates the discharge port of the compressor 11 with the outdoor heat exchanger 13 and the accumulator 17 with the port P2 of the heat exchanger 16 with reference to FIG.
  • the four-way valve 12 communicates the discharge port of the compressor 11 with the port P2 of the heat exchanger 16 and the accumulator 17 with the outdoor heat exchanger 13.
  • the outdoor heat exchanger 13 is a fin tube type heat exchanger composed of fins and a heat transfer tube. In the outdoor heat exchanger 13, heat exchange is performed between the refrigerant and the outdoor air. In the cooling operation, the outdoor heat exchanger 13 functions as a condenser. In the heating operation, the outdoor heat exchanger 13 functions as an evaporator.
  • the outdoor fan 14 includes a motor and a propeller fan driven by the motor. In order to promote heat exchange in the outdoor heat exchanger 13, the outdoor fan 14 blows outdoor air to the outdoor heat exchanger 13 and exchanges heat with the refrigerant in the outdoor heat exchanger 13 from the refrigerant circuit 1. Discharge to the outside.
  • the decompression device 15 adiabatically expands the refrigerant from the heat exchanger that functions as a condenser.
  • Examples of the pressure reducing device 15 include an electronic expansion valve or a capillary.
  • the pressure reducing device 15 is an electronic expansion valve, the flow rate of the refrigerant passing through the pressure reducing device 15 can be efficiently controlled per unit time by adjusting the opening degree of the pressure reducing device 15.
  • the decompression device 15 is a capillary, the flow rate of the refrigerant is fixed.
  • the heat exchanger 16 heat exchange is performed between the refrigerant circulating in the refrigerant circuit 1 and the water circulating in the water circuit 2.
  • the heat exchanger 16 is a plate heat exchanger including a plurality of stacked plates. Each of the plates is wavy.
  • the heat exchanger 16 has a structure sealed by brazing. Of the plurality of stacked plates, the refrigerant or water is guided from the inlet nozzle of each plate to the gap between two adjacent plates. In the plurality of stacked plates, gaps through which the refrigerant is guided and gaps through which water is guided are alternately formed.
  • the heat exchanger 16 functions as an evaporator.
  • the heat exchanger 16 functions as a condenser.
  • the heat exchanger 16 is not limited to the plate heat exchanger, and may be, for example, a shell-and-tube heat exchanger.
  • the water circuit 2 includes a pump 21, a load device 22, a water temperature sensor 23, a flow meter 24, and a differential pressure gauge 25, and each configuration included in the water circuit 2 is connected by a water pipe.
  • Water circulates in the order of the pump 21, the port P3 of the heat exchanger 16, the port P4 of the heat exchanger 16, and the load device 22.
  • the substance circulating in the water circuit 2 may be a refrigerant containing water, and may be brine, for example.
  • the water temperature sensor 23 measures the temperature (water temperature) Twoout of the water flowing out from the port P4 of the heat exchanger 16 and outputs it to the control device 3.
  • the water temperature Twoout is the temperature of the water that has exchanged heat with the refrigerant in the heat exchanger 16.
  • the flow meter 24 measures the water flow rate Qw discharged from the pump 21 per unit time and outputs it to the control device 3.
  • the differential pressure gauge 25 measures the water pressure difference ⁇ Pw (pressure difference) obtained by subtracting the water pressure of the port P4 from the water pressure of the port P3 of the heat exchanger 16 and outputs it to the control device 3.
  • the pump 21 circulates water in the water circuit 2.
  • the amount of water discharged by the pump 21 per unit time is controlled by the drive frequency (pump frequency) from the control device 3.
  • the pump inverter (not shown) may be controlled so that the measured value of the flow meter 24 or the measured value of the differential pressure gauge 25 approaches the target value.
  • the control method of the pump 21 can be appropriately set according to the performance of the air conditioner 100, the installation status of the air conditioner 100, and the like.
  • the indoor air and water exchange heat In the load device 22, the indoor air and water exchange heat.
  • Examples of the load device 22 include an air handling unit and a fan coil unit.
  • the number of load devices 22 may be plural.
  • the control device 3 controls the drive frequency of the compressor 11 and the drive frequency of the pump 21 so that the temperature of the indoor space becomes the target temperature (for example, the temperature set by the user) per unit time of the compressor 11.
  • the amount of refrigerant discharged to the pump 21 and the amount of water discharged by the pump 21 per unit time are controlled.
  • the control device 3 controls the four-way valve 12 to switch the circulation direction of the refrigerant between the cooling operation and the heating operation.
  • the control device 3 measures the current value Iw flowing through the pump 21.
  • the control device 3 includes a processing circuit 31, a memory 32, and an input / output unit 33.
  • the processing circuit 31 may be dedicated hardware or a CPU (Central Processing Unit) that executes a program stored in the memory 32.
  • the processing circuit 31 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or an FPGA (Field). Programmable Gate Array) or a combination of these is applicable.
  • the processing circuit 31 is a CPU, the function of the control device 3 is realized by software, firmware, or a combination of software and firmware.
  • the software or firmware is described as a program and stored in the memory 32.
  • the processing circuit 31 reads and executes the program stored in the memory 32.
  • the CPU is also called a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a processor, or a DSP (Digital Signal Processor).
  • the processing circuit 31 displays the abnormality code of the air conditioner 100 on the input / output unit 33.
  • the input / output unit 33 includes, for example, a display formed on a control board. The user can know the abnormality of the air conditioner 100 by checking the display on the display.
  • the memory 32 stores the water flow rate Qw from the flow meter 24, the water pressure difference ⁇ Pw from the differential pressure gauge 25, and the water temperature Twout from the water temperature sensor 23.
  • the memory 32 includes a non-volatile or volatile semiconductor memory (for example, RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), or EEPROM (Electrically Erasable Programmable Read). Only Memory)), and includes magnetic discs, flexible discs, optical discs, compact discs, mini discs, or DVDs (Digital Versatile Discs).
  • the refrigerant is the compressor 11, the four-way valve 12, the outdoor heat exchanger 13, the decompression device 15, the port P1 of the heat exchanger 16, the port P2 of the heat exchanger 16, and the four-way valve 12.
  • the refrigerant circuit 1 circulates in the circulation direction (first circulation direction) of the accumulator 17.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is condensed in the outdoor heat exchanger 13 and changed into a liquid refrigerant, and the heat of condensation is released to the outside.
  • the liquid refrigerant flowing out of the outdoor heat exchanger 13 undergoes adiabatic expansion in the depressurizing device 15 and changes into a low-pressure two-phase refrigerant in which the liquid refrigerant and the gas refrigerant coexist.
  • the two-phase refrigerant from the decompression device 15 absorbs the heat of vaporization from the water circulating in the water circuit 2 in the heat exchanger 16 and changes into a gas refrigerant.
  • the refrigerant from the heat exchanger 16 is separated into a liquid refrigerant and a gas refrigerant when passing through the accumulator 17.
  • the gas refrigerant from the accumulator 17 is sucked into the compressor 11.
  • the temperature of the refrigerant is lower than the temperature of water. Since the heat of water is absorbed by the refrigerant as heat of vaporization, the temperature of water drops. When the temperature of water falls below the freezing point (0 ° C) of water, ice with frozen water begins to form. As a result, the volume of water expands and the plate of the heat exchanger 16 may burst. When the plate bursts, water flows into the refrigerant circuit 1 and the air conditioner 100 does not operate normally. Repairing a ruptured plate takes a long time.
  • the control device 3 controls the four-way valve 12 without going through the outdoor heat exchanger 13 and the decompression device 15.
  • a high-temperature refrigerant from the discharge port of the compressor 11 is supplied to the heat exchanger 16. That is, when the water freezing condition is satisfied in the refrigerant circulation direction in the cooling operation shown in FIG. 1, the control device 3 controls the four-way valve 12 to change the refrigerant circulation direction to the refrigerant in the heating operation shown in FIG. Switch to the circulation direction of.
  • the temperature of the water in the heat exchanger 16 is raised to water. Freezing can be suppressed. As a result, the failure of the air conditioner 100 can be prevented.
  • the refrigerant is the compressor 11, the four-way valve 12, the port P2 of the heat exchanger 16, the port P1 of the heat exchanger 16, the decompression device 15, the outdoor heat exchanger 13, and the four-way valve.
  • the refrigerant circuit 1 is circulated in the circulation direction (second circulation direction) of the accumulator 17 and the accumulator 17.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is condensed in the heat exchanger 16 and changed into a liquid refrigerant, and the heat of condensation is released to water.
  • the liquid refrigerant flowing out of the heat exchanger 16 undergoes adiabatic expansion in the decompression device 15 and changes to a low-pressure two-phase refrigerant.
  • the two-phase refrigerant from the depressurizing device 15 absorbs the heat of vaporization from the outdoor air in the outdoor heat exchanger 13 and changes into a gas refrigerant.
  • the refrigerant from the outdoor heat exchanger 13 is separated into a liquid refrigerant and a gas refrigerant in the accumulator 17.
  • the gas refrigerant from the accumulator 17 is sucked into the compressor 11.
  • FIG. 3 is a time chart of the water temperature Twoout from the water temperature sensor 23 of FIG. Freezing of water in the heat exchanger 16 lowers the temperature of the water flowing out of the heat exchanger 16. Therefore, as shown in FIG. 3, it is determined that the water is frozen when the water temperature Twout is lower than the reference temperature T0 (first reference temperature), and when the water temperature Twout is equal to or higher than the reference temperature T0, the water is frozen. It can be determined that the temperature is normal. That is, the freezing condition can be a condition that the water temperature Twout is lower than the reference temperature T0. According to the freezing conditions, it is determined that the water is normal at time tm1 and that the water is frozen at time tm2.
  • FIG. 4 is a time chart of the water flow rate Qw from the flow meter 24 of FIG. Freezing of water in the heat exchanger 16 blocks the flow path through which water can pass in the heat exchanger 16, so that the amount of water flowing out from the heat exchanger 16 per unit time is reduced. Therefore, as shown in FIG. 4, when the water flow rate Qw is smaller than the reference amount Qw0, it is determined that the water is frozen, and when the water flow rate Qw is equal to or more than the reference amount Qw0, the water is not frozen and is normal. It can be determined that there is. That is, the freezing condition can be a condition that the water flow rate Qw is smaller than the reference amount Qw0. According to the freezing conditions, the water is determined to be normal at time tm3, and the water is determined to be frozen at time tm4.
  • FIG. 5 is a time chart of the water differential pressure ⁇ Pw from the differential pressure gauge 25 of FIG. Freezing of water in the heat exchanger 16 blocks the flow path through which water can pass in the heat exchanger 16 and reduces the flow rate of water flowing into the heat exchanger 16 per unit time. Therefore, the pressure of water flowing from the pump 21 to the flow path of the heat exchanger 16 increases. Further, since the flow rate of water flowing out from the heat exchanger 16 per unit time is reduced, the pressure of water flowing between the heat exchanger 16 and the load device 22 is reduced. As a result, the water pressure difference ⁇ Pw obtained by subtracting the pressure of the water flowing out from the heat exchanger 16 from the pressure of the water flowing into the heat exchanger 16 increases. Therefore, as shown in FIG.
  • the freezing condition can be a condition that the water pressure difference ⁇ Pw is larger than the reference value ⁇ Pw0. According to the freezing conditions, the water is determined to be normal at time tm5, and the water is determined to be frozen at time tm6.
  • FIG. 6 is a time chart of the current value Iw of the pump 21 of FIG. Due to the freezing of water in the heat exchanger 16, the flow rate of water flowing out of the heat exchanger 16 per unit time decreases, so that the flow rate of water passing through the load device 22 per unit time decreases. In order to increase the flow rate of water passing through the load device 22, the pump 21 is controlled so that the flow rate of water discharged from the pump 21 increases. The load on the pump 21 increases, and the current value Iw increases. Therefore, as shown in FIG. 6, when the current value Iw is larger than the reference current value Iw0, it is determined that the water is frozen, and when the current value Iw is equal to or less than the reference current value Iw0, the water is not frozen. It can be determined that it is normal. That is, the freezing condition can be a condition that the current value Iw is larger than the reference current value Iw0. According to the freezing conditions, the water is determined to be normal at time tm7, and the water is determined to be frozen at time tm8
  • the freezing condition of water may be a condition other than the conditions shown in FIGS. 3 to 6, and may include a plurality of conditions.
  • FIG. 7 is a diagram showing a time chart of the water temperature Twoout, a time chart of the connected state of the four-way valve 12, a time chart of the drive frequency of the compressor 11, and a time chart of the drive frequency of the pump 21.
  • the freezing condition a condition that the water temperature Twout is lower than the reference temperature T0 is used.
  • the control device 3 performs a freezing condition determination process for the water temperature Twout at sampling times st1 and st2.
  • the ON state of the four-way valve 12 is a connection state in which the discharge port of the compressor 11 communicates with the port P2 of the heat exchanger 16 as shown in FIG.
  • the OFF state of the four-way valve 12 is a connection state in which the discharge port of the compressor 11 communicates with the outdoor heat exchanger 13 as shown in FIG.
  • the control device 3 determines that the water is frozen, and switches the four-way valve 12 from the OFF state to the ON state at the sampling time st1. Since the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is guided to the heat exchanger 16, the temperature of the heat exchanger 16 rises and the frozen water melts.
  • the air conditioner 100 is in cooling operation according to the user's setting.
  • the air conditioner 100 automatically starts the heating operation.
  • the heating operation is not intended to heat the load device, but to melt the frozen water in the heat exchanger 16. Therefore, when the freezing condition is satisfied, the control device 3 does not reduce the comfort of the user who requests the cooling operation as much as possible. Therefore, when the drive frequency of the compressor 11 is set to the normal operation (when the freezing condition is not satisfied). Lower than the drive frequency.
  • the drive frequency of the compressor 11 when the freezing condition is satisfied may be set to the lowest frequency. In FIG. 7, the control device 3 reduces the drive frequency of the compressor 11 from f2 to f1 at the sampling time st1.
  • the control device 3 does not change the drive frequency of the pump 21 even if the freezing condition is satisfied. In FIG. 7, the control device 3 maintains the drive frequency of the pump 21 at f3 even after the sampling time st1.
  • the control device 3 When the freeze-resolving condition (second condition) that the water temperature Twout is higher than the reference temperature T1 (second reference temperature) is satisfied, the control device 3 considers that the freezing of water in the heat exchanger 16 has been resolved, and the four-way valve 12 To switch and restart the cooling operation.
  • the water temperature Twout is higher than the reference temperature T1 (> T0) at the sampling time st2.
  • the control device 3 switches the connection state of the four-way valve 12 from the ON state to the OFF state at the sampling time st2, returns the drive frequency of the compressor 11 from f1 to f2, and restarts the cooling operation.
  • FIG. 8 is a flowchart showing the flow of the freeze determination process performed by the control device 3 of FIGS. 1 and 2.
  • the process shown in FIG. 8 is executed for each sampling time by a main routine (not shown) that controls the air conditioner 100 in an integrated manner.
  • the step is simply referred to as S.
  • the control device 3 determines whether or not the freezing condition is satisfied in S101. If the freezing condition is not satisfied (NO in S101), the control device 3 returns the process to the main routine. When the freezing condition is satisfied (YES in S101), the control device 3 switches the four-way valve 12 in S102 and proceeds to the process in S103. The control device 3 lowers the drive frequency of the compressor 11 in S103, and advances the process to S104. After waiting for a certain period of time in S104, the control device 3 advances the process to S105. The control device 3 determines in S105 whether or not the water temperature Twout is larger than the reference temperature T1.
  • the control device 3 When the water temperature Twout is equal to or lower than the reference temperature T1 (NO in S105), the control device 3 returns the process to S104. When the water temperature Twout is higher than the reference temperature T1 (YES in S105), the control device 3 switches the four-way valve 12 in S106 and proceeds to the process in S107. The control device 3 increases the drive frequency of the compressor 11 in S107 and returns the process to the main routine.
  • FIG. 9 is a flowchart showing the flow of the freeze determination process performed in the first modification of the first embodiment.
  • the flowchart shown in FIG. 9 is a flowchart in which S106 and S107 of the flowchart of FIG. 8 are replaced with S116 and S117, respectively.
  • the control device 3 when YES in S105, the control device 3 notifies the user of the abnormality code in S117 after stopping the compressor 11 in S116, and returns the process to the main routine.
  • FIG. 10 is a flowchart showing the flow of the freeze determination process performed in the second modification of the first embodiment.
  • the flowchart shown in FIG. 10 is a flowchart in which S110 is added between S105 and S106 of the flowchart of FIG.
  • the control device 3 waits for a certain period of time in S110, then performs processing in the order of S106 and S107, and returns the processing to the main routine. While the control device 3 waits in S110 for a certain period of time, the supply of the high-temperature refrigerant discharged from the compressor 11 to the heat exchanger 16 continues. After waiting for a certain period of time in S110, the compressor 11 may be stopped in S111 as shown in the flowchart of the modification 3 shown in FIG.
  • FIG. 12 is a flowchart showing the flow of the freeze determination process performed in the modified example 4 of the first embodiment.
  • the flowchart shown in FIG. 12 is a flowchart in which S114 to S117 are added to the flowchart of FIG. S116 and S117 in FIG. 12 are similar to S116 and S117 in FIG.
  • the control device 3 increases the number of freezes, which is the number of times the condition of S105 is satisfied after the condition of freeze of S101 is satisfied, by 1 in S114, and sets the process to S115. Proceed.
  • the number of freezes is set to 0 each time the cooling operation is started by the user.
  • the control device 3 determines whether or not the number of freezes is greater than the reference number N1 in S115. When the number of freezes is equal to or less than the reference number N1 (NO in S115), the control device 3 returns the process to the main routine after executing S106 and S107 in the same manner as in FIG. When the number of freezes is larger than the reference number N1 (YES in S115), the control device 3 returns the process to the main routine after executing S116 and S117 as in FIG.
  • the air conditioner according to the first embodiment it is possible to prevent the air conditioner from malfunctioning due to freezing of water.
  • Embodiment 2 In the first embodiment, an air conditioner capable of switching between cooling operation and heating operation has been described. In the second embodiment, an air conditioner for cooling operation will be described.
  • FIG. 13 is a functional block diagram showing the configuration of the air conditioner 200 according to the second embodiment, and the flow of the refrigerant and the flow of water in the normal cooling operation.
  • FIG. 14 is a functional block diagram showing the configuration of the air conditioner 200 according to the second embodiment, and the flow of the refrigerant and the flow of water when the freezing condition is satisfied.
  • the configuration of the air conditioner 200 is such that the refrigerant circuit 1 and the control device 3 in FIG. 1 are replaced with the refrigerant circuit 1A and the control device 3A, respectively.
  • the configuration of the refrigerant circuit 1A is a configuration in which the four-way valve 12 is removed from the configuration of the refrigerant circuit 1 of FIG. 1 and an operation valve 18 (switching valve) is added. Other than these, the same applies, so the description will not be repeated.
  • the operation valve 18 is connected between the discharge port of the compressor 11 and the flow path between the decompression device 15 and the heat exchanger 16.
  • the control device 3A closes the operation valve 18.
  • the control device 3 opens the operation valve 18 as shown in FIG.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is supplied to the heat exchanger 16.
  • FIG. 15 is a flowchart showing the flow of the freeze determination process performed by the control device 3A of FIGS. 13 and 14. The process shown in FIG. 15 is executed for each sampling time by a main routine (not shown) that controls the air conditioner 200 in an integrated manner.
  • the flowchart shown in FIG. 15 is a flowchart in which S102 and S106 of the flowchart shown in FIG. 8 are replaced with S202 and S206, respectively.
  • the control device 3A opens the operation valve 18 in S202 and proceeds to the process in S103.
  • the control device 3A executes S103 to S105 in the same manner as in the first embodiment.
  • the control device 3A opens the operation valve 18 in S206, executes S107, and then returns the process to the main routine.
  • the air conditioner according to the second embodiment it is possible to prevent the air conditioner from malfunctioning due to freezing of water.
  • 1,1A refrigerant circuit 1,1A refrigerant circuit, 2 water circuit, 3,3A controller, 11 compressor, 12 four-way valve, 13 outdoor heat exchanger, 14 outdoor fan, 15 decompression device, 16 heat exchanger, 17 accumulator, 18 operation valve, 21 pump, 22 load device, 23 water temperature sensor, 24 flow meter, 25 differential pressure gauge, 31 processing circuit, 32 memory, 33 input / output unit, 100, 200 air conditioner, P1 to P4 ports.

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

Abstract

L'invention concerne un dispositif de climatisation (100) qui comprend une première unité de cycle (1), une seconde unité de cycle (2), et un dispositif de commande (3). Dans la première unité de cycle (1), un premier fluide frigorigène circule à travers un compresseur (11), un premier échangeur de chaleur (13), un dispositif de décompression (15) et un second échangeur de chaleur (16) dans une première direction de circulation. Dans la seconde unité de cycle (2), un second fluide frigorigène contenant de l'eau circule à travers une pompe (21), le second échangeur de chaleur (16), et un dispositif de charge (22) dans cet ordre. La première unité de cycle (1) comprend une soupape de commutation (12) connectée entre un orifice de refoulement du compresseur (11) et le second échangeur de chaleur (16). Lorsqu'une première condition indiquant la congélation du second fluide frigorigène est satisfaite, le dispositif de commande (3) commande la soupape de commutation (12) à fournir le premier fluide frigorigène refoulé de l'orifice de refoulement du compresseur (11) au second échangeur de chaleur (16) sans traverser le premier échangeur de chaleur (13) et le dispositif de décompression (15).
PCT/JP2019/028359 2019-07-18 2019-07-18 Dispositif de climatisation WO2021009924A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2021532659A JPWO2021009924A1 (fr) 2019-07-18 2019-07-18
PCT/JP2019/028359 WO2021009924A1 (fr) 2019-07-18 2019-07-18 Dispositif de climatisation
JP2023123171A JP2023156370A (ja) 2019-07-18 2023-07-28 空調装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/028359 WO2021009924A1 (fr) 2019-07-18 2019-07-18 Dispositif de climatisation

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JP5492523B2 (ja) * 2009-10-22 2014-05-14 日立アプライアンス株式会社 空気調和機
JP2017142039A (ja) * 2016-02-12 2017-08-17 三菱重工サーマルシステムズ株式会社 空気調和装置
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JP2018066515A (ja) * 2016-10-20 2018-04-26 株式会社長府製作所 ヒートポンプ温水暖房システムの制御方法

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