WO2021095124A1 - Dispositif à cycle frigorifique - Google Patents

Dispositif à cycle frigorifique Download PDF

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Publication number
WO2021095124A1
WO2021095124A1 PCT/JP2019/044375 JP2019044375W WO2021095124A1 WO 2021095124 A1 WO2021095124 A1 WO 2021095124A1 JP 2019044375 W JP2019044375 W JP 2019044375W WO 2021095124 A1 WO2021095124 A1 WO 2021095124A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
source side
heat source
refrigerant
side heat
Prior art date
Application number
PCT/JP2019/044375
Other languages
English (en)
Japanese (ja)
Inventor
拓也 松田
周平 水谷
央貴 丸山
Original Assignee
三菱電機株式会社
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.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to US17/641,551 priority Critical patent/US20220299247A1/en
Priority to PCT/JP2019/044375 priority patent/WO2021095124A1/fr
Priority to JP2021555660A priority patent/JP7183447B2/ja
Publication of WO2021095124A1 publication Critical patent/WO2021095124A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger
    • 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
    • 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
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • 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
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21163—Temperatures of a condenser of the refrigerant at the outlet of the condenser
    • 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

Definitions

  • the present invention relates to a refrigeration cycle device that harmonizes the air in the air-conditioned space.
  • the heat exchanger disclosed in Patent Document 1 has a main heat exchange unit and a sub heat exchange unit provided at different positions in the vertical direction from the main heat exchange unit and connected in series with the main heat exchange unit.
  • the main heat exchange section is provided with more flat tubes than the sub heat exchange section located on the downstream side of the main heat exchange section. Further, a flat tube at the bottom of the heat exchanger is provided in the main heat exchanger on the upstream side of the sub heat exchanger.
  • the refrigerant discharged from the compressor during the defrosting operation flows into the sub heat exchange section after passing through the main heat exchange section. That is, the refrigerant discharged from the compressor flows through the main heat exchange section even after the defrosting of the main heat exchange section is completed and before it flows into the sub heat exchange section. Therefore, the heat of the refrigerant is wasted because the refrigerant and the air are heat-exchanged in the main heat exchange section that does not require defrosting before reaching the sub heat exchange section. As a result, defrosting cannot be performed efficiently.
  • the present invention has been made to solve the above problems, and provides a refrigeration cycle apparatus capable of efficiently defrosting.
  • the refrigeration cycle apparatus includes a compressor that compresses and discharges a refrigerant, an expansion valve that depressurizes and expands the refrigerant, a load side heat exchanger connected to the expansion valve, the compressor, and the like.
  • a flow path switching device connected to the load side heat exchanger, and a first heat source side heat exchanger and a second heat source side heat exchanger connected in parallel between the flow path switching device and the expansion valve.
  • the heat source side heat exchanger including the refrigerant, the on-off valve provided on the downstream side of the second heat source side heat exchanger of the refrigerant flowing during the defrosting operation, and the on-off valve provided on the downstream side of the second heat source side heat exchanger are discharged from the compressor during the defrosting operation.
  • It has a control device that controls the flow path switching device so that the refrigerant flows into the heat source side heat exchanger, and the control device opens the on-off valve when the defrosting operation is started.
  • the on-off valve is changed from the closed state to the open state according to the first defrosting means for switching from the open state to the closed state, the determining means for determining the switching timing of the defrosting target, and the timing determined by the determining means.
  • It has a second defrosting means for switching.
  • the refrigerant discharged from the compressor is transferred to the first heat source side heat exchanger of the two heat source side heat exchangers. It flows intensively. After that, when the second defrosting means opens the on-off valve, most of the heat of the refrigerant is spent on defrosting the second heat source side heat exchanger. Therefore, wasteful consumption of the heat of the refrigerant is suppressed as compared with the case where two heat source side heat exchangers connected in series are defrosted at the same time. As a result, the two heat source side heat exchangers can be efficiently defrosted.
  • FIG. It is a refrigerant circuit diagram which shows one configuration example of the refrigeration cycle apparatus which concerns on Embodiment 1.
  • FIG. It is a functional block diagram which shows one configuration example of the control device shown in FIG.
  • FIG. It is a hardware configuration diagram which shows one configuration example of the control device shown in FIG.
  • FIG. It is a hardware configuration diagram which shows another configuration example of the control device shown in FIG.
  • It is a flowchart which shows an example of the operation procedure of the refrigeration cycle apparatus shown in FIG.
  • FIG. It is a refrigerant circuit diagram which shows one configuration example of the refrigeration cycle apparatus of modification 1.
  • FIG. It is a functional block diagram which shows one configuration example of the control device in modification 1.
  • FIG. It is a refrigerant circuit diagram which shows one configuration example of the refrigeration cycle apparatus of the modification 2.
  • FIG. 2 It is a functional block diagram which shows one configuration example of the control device in the modification 2. It is a flowchart which shows an example of the operation procedure of the refrigeration cycle apparatus shown in FIG. It is a refrigerant circuit diagram which shows one configuration example of the refrigeration cycle apparatus of the modification 3. It is a refrigerant circuit diagram which shows one configuration example of the refrigeration cycle apparatus which concerns on Embodiment 2.
  • FIG. It is a side view which shows one configuration example of the 1st heat source side heat exchanger shown in FIG. It is a side view which shows one configuration example of the 2nd heat source side heat exchanger shown in FIG. It is a refrigerant circuit diagram which shows the structural example of the refrigeration cycle apparatus of the comparative example.
  • FIG. 8 is an external perspective view of the heat source side unit shown in FIG. 18 when viewed from a direction different from that in the case of FIG.
  • FIG. 18 is a schematic diagram which shows the layout of the heat source side heat exchanger when the heat source side unit shown in FIG.
  • FIG. 20 is seen from the top. It is a side view which shows one configuration example of the 1st division heat exchanger shown in FIG. It is a side view which shows one configuration example of the 2nd heat source side heat exchanger shown in FIG. It is a refrigerant circuit diagram which shows one configuration example of the refrigeration cycle apparatus of the modification 4.
  • FIG. 1 is a refrigerant circuit diagram showing a configuration example of the refrigeration cycle device according to the first embodiment.
  • the refrigeration cycle device 1 includes a heat source side unit 10, load side units 20a and 20b, and a control device 30 for controlling the heat source side unit 10 and the refrigerant equipment included in the load side units 20a and 20b.
  • FIG. 1 shows a case where the refrigeration cycle device 1 has two load-side units 20a and 20b, but the load-side unit may be one or three or more. Good.
  • the heat source side unit 10 includes a compressor 2 that compresses and discharges the refrigerant, a heat source side heat exchanger 15 that exchanges heat with the outside air, a flow path switching device 5, an accumulator 6, and an on-off valve 7. .
  • the heat source side heat exchanger 15 includes a first heat source side heat exchanger 3 and a second heat source side heat exchanger 4.
  • the load-side unit 20a includes a load-side heat exchanger 21a that exchanges heat with the air in the room where the load-side unit 20a is installed, and an expansion valve 22a that depressurizes and expands the refrigerant.
  • the load-side unit 20b includes a load-side heat exchanger 21b that exchanges heat with the air in the room where the load-side unit 20b is installed, and an expansion valve 22b that depressurizes and expands the refrigerant.
  • the first heat source side heat exchanger 3 and the second heat source side heat exchanger 4 are connected in parallel between the flow path switching device 5 and the expansion valves 22a and 22b.
  • one refrigerant inlet / outlet is connected to the first gas pipe 43a, and the other refrigerant inlet / outlet is connected to the first liquid pipe 44a.
  • one refrigerant inlet / outlet is connected to the second gas pipe 43b, and the other refrigerant inlet / outlet is connected to the second liquid pipe 44b.
  • the first gas pipe 43a and the second gas pipe 43b join the gas pipe 41 and are connected to the flow path switching device 5.
  • the first liquid pipe 44a and the second liquid pipe 44b join the liquid pipe 47 and are connected to the expansion valves 22a and 22b.
  • the on-off valve 7 is provided in the second liquid pipe 44b.
  • the flow path switching device 5 is connected to the load side heat exchangers 21a and 21b via the refrigerant pipe 42, and is connected to the accumulator 6 via the refrigerant pipe 48. Further, the flow path switching device 5 is connected to the compressor 2 and the accumulator 6 via the refrigerant pipe 49. The accumulator 6 is connected to the refrigerant suction port of the compressor 2.
  • the compressor 2, the first heat source side heat exchanger 3, the second heat source side heat exchanger 4, the expansion valve 22a, and the load side heat exchanger 21a are connected by a pipe such as a refrigerant pipe 42, and the refrigerant circuit 60a Is configured.
  • the compressor 2, the first heat source side heat exchanger 3, the second heat source side heat exchanger 4, the expansion valve 22b, and the load side heat exchanger 21b are connected by a pipe such as a refrigerant pipe 42, and the refrigerant is used.
  • the circuit 60b is configured.
  • the second heat source side heat exchanger 4 is provided with a heat exchanger temperature sensor 11 that detects the temperature Te of the refrigerant.
  • the second liquid pipe 44b is provided with a refrigerant temperature sensor 12 that detects the temperature Tn2 of the refrigerant flowing through the second liquid pipe 44b.
  • the load-side unit 20a is provided with a room temperature sensor 23a that detects the temperature of the air in the room in which the load-side unit 20a is installed.
  • the load-side unit 20b is provided with a room temperature sensor 23b that detects the temperature of the air in the room in which the load-side unit 20b is installed.
  • the heat exchanger temperature sensor 11, the refrigerant temperature sensor 12, and the room temperature sensors 23a and 23b are, for example, thermistors.
  • the heat exchanger temperature sensor 11 may be provided on the first heat source side heat exchanger 3 side instead of the second heat source side heat exchanger 4.
  • the compressor 2 is a compressor whose capacity can be changed, for example, an inverter compressor.
  • the accumulator 6 is a container that prevents the liquid refrigerant from being sucked into the compressor 2.
  • the expansion valves 22a and 22b are, for example, electronic expansion valves.
  • the flow path switching device 5 switches the flow direction of the refrigerant discharged from the compressor 2 to the gas pipe 41 or the refrigerant pipe 42.
  • the flow path switching device 5 is, for example, a four-way valve.
  • the on-off valve 7 is, for example, a shutoff valve capable of switching from one of the closed state and the open state to the other state.
  • the on-off valve 7 may be an electronic expansion valve that adjusts the flow rate of the flowing refrigerant.
  • the first heat source side heat exchanger 3, the second heat source side heat exchanger 4, and the load side heat exchangers 21a and 21b are, for example, fin-and-tube heat exchangers.
  • the control device 30 is connected to each device of the compressor 2, the flow path switching device 5, the expansion valves 22a and 22b, and the on-off valve 7 via a signal line (not shown in the figure). Further, the control device 30 is connected to each of the room temperature sensors 23a and 23b, the heat exchanger temperature sensor 11, and the refrigerant temperature sensor 12 via signal lines (not shown in the figure).
  • the communication connection between the control device 30 and each device of the compressor 2, the flow path switching device 5, the expansion valve 22a, the expansion valve 22b, and the on-off valve 7 is not limited to the wired connection, but may be wireless.
  • the communication connection between the control device 30 and each of the room temperature sensor 23a, the room temperature sensor 23b, the heat exchanger temperature sensor 11 and the refrigerant temperature sensor 12 is not limited to wired, but may be wireless.
  • the refrigerant flowing into the first heat source side heat exchanger 3 and the second heat source side heat exchanger 4 condenses by exchanging heat with air in these heat exchangers connected in parallel, and becomes a low-temperature and high-pressure liquid refrigerant. Then, it flows out from the first heat source side heat exchanger 3 and the second heat source side heat exchanger 4.
  • the liquid refrigerant flows into the load side heat exchanger 21a.
  • the refrigerant that has flowed into the load-side heat exchanger 21a evaporates by exchanging heat with air in the load-side heat exchanger 21a, becomes a low-temperature low-pressure gas refrigerant, and flows out of the load-side heat exchanger 21a.
  • the air in the room is cooled by the refrigerant absorbing heat from the air in the room.
  • the refrigerant flowing out of the load-side heat exchanger 21a is sucked into the compressor 2 via the flow path switching device 5.
  • the cooling operation after the refrigerant discharged from the compressor 2 circulates in order through the first heat source side heat exchanger 3 and the second heat source side heat exchanger 4, the expansion valve 22a, and the load side heat exchanger 21a. , The cycle until it is sucked into the compressor 2 is repeated.
  • the control device 30 switches the flow path of the flow path switching device 5 so that the refrigerant discharged from the compressor 2 flows into the load side heat exchanger 21a.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 2
  • the high-temperature and high-pressure gas refrigerant is discharged from the compressor 2.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 2 flows into the load-side heat exchanger 21a via the flow path switching device 5.
  • the refrigerant flowing into the load-side heat exchanger 21a is condensed by exchanging heat with air in the load-side heat exchanger 21a, becomes a high-temperature and high-pressure liquid refrigerant, and flows out from the load-side heat exchanger 21a.
  • the air in the room is warmed by the refrigerant dissipating heat to the air in the room.
  • the high temperature and high pressure liquid refrigerant flowing out from the load side heat exchanger 21a becomes a low temperature and low pressure liquid refrigerant by the expansion valve 22a.
  • the liquid refrigerant flows into the first heat source side heat exchanger 3 and the second heat source side heat exchanger 4.
  • the refrigerant evaporates by exchanging heat with air to become a low-temperature low-pressure gas refrigerant, and becomes the first heat source side heat exchanger 3 and the first heat exchanger. 2 Outflow from the heat source side heat exchanger 4.
  • the refrigerant flowing out from the first heat source side heat exchanger 3 and the second heat source side heat exchanger 4 is sucked into the compressor 2 via the flow path switching device 5.
  • the refrigerant discharged from the compressor 2 is the load side heat exchanger 21a, the expansion valve 22a, the first heat source side heat exchanger 3, and the second heat source side heat. After circulating the exchanger 4 in order, the cycle until it is sucked into the compressor 2 is repeated.
  • FIG. 2 is a functional block diagram showing a configuration example of the control device shown in FIG.
  • the control device 30 includes a refrigerating cycle control means 51, a determination means 52, a timer 53, a first defrosting means 54, and a second defrosting means 55.
  • Various functions of the control device 30 are realized by executing software by an arithmetic unit such as a microcomputer. Further, the control device 30 may be composed of hardware such as a circuit device that realizes various functions.
  • the set temperature Ts1 is input to the control device 30 by the user who uses the load side unit 20a via a remote controller (not shown).
  • the set temperature Ts2 is input to the control device 30 by the user who uses the load side unit 20b via a remote controller (not shown).
  • the installation position of the control device 30 is not limited, and the control device 30 may be provided in the heat source side unit 10 or in the load side unit 20a or 20b. May be good.
  • the refrigeration cycle control means 51 controls the flow path switching device 5 according to the operation mode of the refrigeration cycle device 1.
  • the refrigeration cycle control means 51 controls the operating frequency of the compressor 2 and the opening degrees of the expansion valves 22a and 22b based on the detected values received from the room temperature sensors 23a and 23b and the set temperatures Ts1 and Ts2. Specifically, the refrigeration cycle control means 51 sets the operating frequency of the compressor 2 and the operating frequency of the compressor 2 so that the detected value of the room temperature sensor 23a approaches the set temperature Ts1 and the detected value of the room temperature sensor 23b approaches the set temperature Ts2.
  • the opening degrees of the expansion valves 22a and 22b are controlled.
  • the refrigeration cycle control means 51 monitors the temperature Te of the refrigerant received from the heat exchanger temperature sensor 11, and whether the temperature Te of the refrigerant is equal to or less than a predetermined temperature threshold T0. Judge whether or not.
  • the temperature threshold T0 is, for example, 0 ° C.
  • the refrigerating cycle control means 51 controls the flow path switching device 5 to switch the flow path and determines the defrosting start information indicating that the defrosting operation is started. Send to 52.
  • the refrigerating cycle control means 51 controls the flow path switching device 5 to switch the flow path, and switches the operation mode from the defrosting operation to the heating operation.
  • the timer 53 measures the time and provides the measurement time information to the determination means 52.
  • the determination means 52 determines the timing of switching the defrost target based on at least one of the time elapsed from the start of defrosting and the temperature Tn2 of the refrigerant detected by the refrigerant temperature sensor 12.
  • the determination means 52 receives the defrosting start information from the refrigeration cycle control means 51, the determination means 52 transfers the defrosting start information to the first defrosting means 54 and monitors the time t1 which is the elapsed time from the defrosting start.
  • the determination means 52 determines whether or not the time t1 is equal to or greater than a predetermined time threshold value tth1.
  • the time threshold value tth1 is set to the time before the defrosting of the first heat source side heat exchanger 3 is completely completed.
  • the determination means 52 transmits switching instruction information to instruct the switching of the state of the on-off valve 7 to the second defrosting means 55.
  • the determination means 52 monitors the refrigerant temperature Tn2 received from the refrigerant temperature sensor 12 after transmitting the switching instruction information to the second defrosting means 55, and the refrigerant temperature Tn2 is equal to or higher than a predetermined temperature threshold value Tb. It is determined whether or not it is.
  • the temperature threshold Tb is, for example, 7 ° C.
  • the determination means 52 transmits the defrosting end information indicating that the defrosting is completed to the refrigerating cycle control means 51.
  • the first defrosting means 54 When the first defrosting means 54 receives the defrosting start information from the determining means 52, the first defrosting means 54 switches the on-off valve 7 from the open state to the closed state.
  • the second defrosting means 55 receives the switching instruction information from the determining means 52, the second defrosting means 55 switches the on-off valve 7 from the closed state to the open state.
  • FIG. 3 is a hardware configuration diagram showing a configuration example of the control device shown in FIG.
  • the control device 30 shown in FIG. 2 is composed of a processing circuit 31 as shown in FIG.
  • Each function of the refrigerating cycle control means 51, the determination means 52, the timer 53, the first defrosting means 54, and the second defrosting means 55 shown in FIG. 2 is realized by the processing circuit 31.
  • 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). It corresponds to Array) or a combination of these.
  • Each of the functions of the refrigerating cycle control means 51, the determination means 52, the timer 53, the first defrosting means 54 and the second defrosting means 55 may be realized by the processing circuit 31, and the function of each means may be 1 It may be realized by one processing circuit 31.
  • FIG. 4 is a hardware configuration diagram showing another configuration example of the control device shown in FIG.
  • the control device 30 shown in FIG. 2 includes a processor 71 and a memory 72 as shown in FIG.
  • the functions of the refrigerating cycle control means 51, the determination means 52, the timer 53, the first defrosting means 54, and the second defrosting means 55 are realized by the processor 71 and the memory 72.
  • FIG. 4 shows that the processor 71 and the memory 72 are communicably connected to each other.
  • the functions of the refrigerating cycle control means 51, the determination means 52, the timer 53, the first defrosting means 54 and the second defrosting means 55 are software, firmware, or software and firmware. It is realized by the combination.
  • the software and firmware are written as a program and stored in the memory 72.
  • the processor 71 realizes the function of each means by reading and executing the program stored in the memory 72.
  • a non-volatile semiconductor memory such as a ROM (Read Only Memory), a flash memory, an EPROM (Erasable and Programmable ROM) and an EPROM (Electrically Erasable and Programmable ROM) is used.
  • a volatile semiconductor memory of RAM Random Access Memory
  • a removable recording medium such as a magnetic disk, a flexible disk, an optical disk, a CD (Compact Disc), an MD (Mini Disc), or a DVD (Digital Versaille Disc) may be used.
  • FIG. 5 is a flowchart showing an example of the operation procedure of the refrigeration cycle apparatus shown in FIG.
  • FIG. 5 shows an example of an operation procedure when the refrigerating cycle device 1 performs a defrosting operation. It is assumed that the refrigerating cycle device 1 is in the heating operation before starting the operation procedure shown in FIG. 5, and the on-off valve 7 is in the open state.
  • the refrigeration cycle control means 51 determines whether or not the temperature Te of the refrigerant received from the heat exchanger temperature sensor 11 is equal to or lower than the temperature threshold value T0 (step S101). In step S101, the refrigeration cycle control means 51 determines that frost has adhered to the heat source side heat exchanger 15 when the temperature Te of the refrigerant becomes equal to or lower than the temperature threshold value T0, and controls the flow path switching device 5 to control the flow path. Switching (step S102). As a result, the refrigerant discharged from the compressor 2 flows into the heat source side heat exchanger 15 via the flow path switching device 5. Further, the refrigeration cycle control means 51 transmits the defrosting start information to the determination means 52 in step S102.
  • the determination means 52 When the determination means 52 receives the defrosting start information from the refrigerating cycle control means 51, the determination means 52 transfers the defrosting start information to the first defrosting means 54 and monitors the time t1 measured by the timer 53. When the first defrosting means 54 receives the defrosting start information from the determining means 52, the first defrosting means 54 closes the on-off valve 7 (step S103). The determination means 52 determines whether or not the time t1 is equal to or greater than the time threshold value tth1 (step S104). In step S104, the determination means 52 transmits the switching instruction information to the second defrosting means 55 when the time t1 becomes the time threshold value tth1 or more.
  • the second defrosting means 55 receives the switching instruction information from the determining means 52, the on-off valve 7 is opened (step S105).
  • the determining means 52 determines whether or not the temperature Tn2 of the refrigerant received from the refrigerant temperature sensor 12 is equal to or higher than the temperature threshold value Tb (step S106).
  • the determination means 52 determines that the defrosting of the heat source side heat exchanger 15 has been completed, and transmits the defrosting completion information to the refrigeration cycle control means 51.
  • the refrigeration cycle control means 51 When the refrigeration cycle control means 51 receives the defrosting end information from the determination means 52, the refrigeration cycle control means 51 controls the flow path switching device 5 to switch the flow path (step S107). As a result, the refrigerant discharged from the compressor 2 flows into the load-side units 20a and 20b via the flow path switching device 5. The operation mode of the refrigeration cycle device 1 returns from the defrosting operation to the heating operation.
  • the first heat source side heat exchanger 3 is intensively defrosted from the time when the refrigeration cycle device 1 starts defrosting until the time t1 reaches the time threshold value tth1.
  • the refrigeration cycle apparatus 1 starts defrosting the second heat source side heat exchanger 4 before the defrosting of the first heat source side heat exchanger 3 is completed, but the first heat source side heat exchanger 3 is defrosted.
  • the determination means 52 determines whether or not the defrosting of the second heat source side heat exchanger 4 is completed by the temperature Tn1 of the refrigerant on the downstream side of the second heat source side heat exchanger 4.
  • the defrosting of the first heat source side heat exchanger 3 is also completed. ..
  • the refrigerant temperature sensor 12 is provided in the second liquid pipe 44b, but the refrigerant temperature is in the liquid pipe 47 near the confluence of the first liquid pipe 44a and the second liquid pipe 44b.
  • the sensor 12 may be provided.
  • the determination means 52 determines whether or not the temperature Tn2 of the refrigerant is equal to or higher than a predetermined temperature threshold value Ta. Then, as a result of the determination in step S104, when the temperature Tn2 of the refrigerant is equal to or higher than the temperature threshold Ta, the determination means 52 may transmit the switching instruction information to the second defrosting means 55.
  • the temperature thresholds Ta and Tb have a relationship of, for example, Ta> Tb. Even if the refrigeration cycle device 1 proceeds to the process of step S105 before the defrosting of the first heat source side heat exchanger 3 is completely completed due to the relationship of Ta> Tb, the refrigerant also remains in the first heat source side heat exchanger 3. Defrosting is performed for distribution. Further, when the refrigerant temperature sensor 12 is provided in the liquid pipe 47, the timer 53 may not be provided in the control device 30.
  • the refrigeration cycle device 1 of the first embodiment includes a compressor 2, an expansion valve 22a, a load side heat exchanger 21a, a flow path switching device 5, a heat source side heat exchanger 15, an on-off valve 7, and the like. It has a control device 30 and.
  • the heat source side heat exchanger 15 has a first heat source side heat exchanger 3 and a second heat source side heat exchanger 4 connected in parallel between the flow path switching device 5 and the expansion valve 22a.
  • the on-off valve 7 is provided on the downstream side of the second heat source side heat exchanger 4 of the refrigerant that circulates during the defrosting operation.
  • the control device 30 controls the flow path switching device 5 so that the refrigerant discharged from the compressor 2 flows into the heat source side heat exchanger 15 during the defrosting operation.
  • the control device 30 includes a first defrosting means 54, a determining means 52, and a second defrosting means 55.
  • the first defrosting means 54 switches the on-off valve 7 from the open state to the closed state when the defrosting operation is started.
  • the determination means 52 determines the timing of switching the defrost target.
  • the second defrosting means switches the on-off valve 7 from the closed state to the open state according to the timing determined by the determination means 52.
  • the first defrosting means 54 closes the on-off valve 7 at the start of defrosting, so that the refrigerant discharged from the compressor 2 is the first of the two heat source side heat exchangers. It flows intensively to the heat exchanger 3 on the heat source side.
  • the second defrosting means 55 opens the on-off valve 7.
  • the refrigerant flows to the second heat source side heat exchanger 4, but also flows to the first heat source side heat exchanger 3.
  • most of the heat of the refrigerant is consumed in the second heat source side heat exchanger 4, and the frost remaining in the first heat source side heat exchanger 3 melts.
  • the first modification is the case where the refrigerating cycle device 1 shown in FIG. 1 is not provided with the refrigerant temperature sensor 12.
  • the same components as those described with reference to FIGS. 1 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.
  • FIG. 6 is a refrigerant circuit diagram showing a configuration example of the refrigeration cycle device of the first modification.
  • FIG. 7 is a functional block diagram showing a configuration example of the control device in the first modification.
  • the heat source side unit 10a of the refrigeration cycle device 1a is not provided with the refrigerant temperature sensor 12 shown in FIG.
  • the determining means 52 determines whether or not the time t1 measured by the timer 53 is equal to or greater than the predetermined time threshold tth2.
  • the time thresholds tth1 and tth2 have a relationship of tth1 ⁇ tth2.
  • the determination means 52 transmits the defrosting end information to the refrigeration cycle control means 51.
  • step S106 the determination means 52 determines whether or not the time t1 measured by the timer 53 is equal to or greater than the time threshold value tth2. As a result of the determination in step S106, when the time t1 becomes the time threshold value tth2 or more, the determination means 52 transmits the defrosting end information to the refrigeration cycle control means 51.
  • the effect of the first embodiment can be obtained even if the refrigerant temperature sensor 12 is not provided.
  • Modification 2 The second modification is the case where the flow rate adjusting valve and the refrigerant temperature sensor are provided in the first liquid pipe 44a in the refrigerating cycle device 1 shown in FIG.
  • the same components as those described with reference to FIGS. 1 to 7 are designated by the same reference numerals, and detailed description thereof will be omitted.
  • FIG. 8 is a refrigerant circuit diagram showing a configuration example of the refrigeration cycle device of the second modification.
  • FIG. 9 is a functional block diagram showing a configuration example of the control device in the second modification.
  • a refrigerant temperature sensor 12a and a flow rate adjusting valve 9 are provided in the first liquid pipe 44a of the heat source side unit 10b of the refrigeration cycle device 1b.
  • the refrigerant temperature sensor 12a detects the temperature Tn1 of the refrigerant flowing through the first liquid pipe 44a.
  • the flow rate adjusting valve 9 can switch from one of the closed state and the open state to the other state.
  • the flow rate adjusting valve 9 can adjust the flow rate of the flowing refrigerant by changing the opening degree.
  • the control device 30 of the second modification does not have the timer 53 shown in FIG.
  • the control device 30 stores in advance the temperature threshold value Ta as a value that serves as a determination standard for determining the timing of switching the defrosting target for the refrigerant temperature Tn1.
  • Ta and Tb may have the same value or different values.
  • FIG. 10 is a flowchart showing an example of the operation procedure of the refrigeration cycle apparatus shown in FIG. It is assumed that the refrigerating cycle device 1b is in the heating operation before starting the operation procedure shown in FIG. 10, and the flow rate adjusting valve 9 and the on-off valve 7 are in the open state. Since the processes of steps S201 and S202 shown in FIG. 10 are the same as the processes of steps S101 and S102 described with reference to FIG. 5, detailed description thereof will be omitted.
  • step S201 After the determination in step S201, when the determination means 52 receives the defrosting start information from the refrigeration cycle control means 51, the determination means 52 transfers the defrosting start information to the first defrosting means 54 and is detected by the refrigerant temperature sensor 12a. The temperature Tn1 of the refrigerant is monitored. When the first defrosting means 54 receives the defrosting start information from the determining means 52, the first defrosting means 54 closes the on-off valve 7 (step S203). The determination means 52 determines whether or not the temperature Tn1 of the refrigerant is equal to or higher than the temperature threshold value Ta (step S204). In step S204, when the temperature Tn1 of the refrigerant becomes equal to or higher than the temperature threshold value Ta, the determination means 52 transmits the switching instruction information to the second defrosting means 55.
  • the determining means 52 determines whether or not the temperature Tn2 of the refrigerant detected by the refrigerant temperature sensor 12b is equal to or higher than the temperature threshold value Tb (step S207). When the temperature Tn2 of the refrigerant becomes equal to or higher than the temperature threshold value Tb, the determination means 52 determines that the defrosting of the heat source side heat exchanger 15 has been completed, and sends the defrosting end information to the second defrosting means 55 and the refrigeration cycle control means 51. Send to.
  • the second defrosting means 55 When the second defrosting means 55 receives the defrosting end information from the determination means 52, the second defrosting means 55 opens the flow rate adjusting valve 9 (step S208).
  • the refrigeration cycle control means 51 When the refrigeration cycle control means 51 receives the defrosting end information from the determination means 52, the refrigeration cycle control means 51 controls the flow path switching device 5 to switch the flow path (step S209). As a result, the refrigerant discharged from the compressor 2 flows into the load-side units 20a and 20b via the flow path switching device 5. The operation mode of the refrigeration cycle device 1 returns from the defrosting operation to the heating operation.
  • step S206 shown in FIG. 10 the second defrosting means 55 closes the flow rate adjusting valve 9, but does not completely close the flow rate adjusting valve 9 and reduces the opening degree of the flow rate adjusting valve 9.
  • the refrigerant may be circulated a little.
  • step S208 the second defrosting means 55 fully opens the flow rate adjusting valve 9.
  • a valve for shutting off the flow of the refrigerant is provided in each of the liquid pipes of the first heat source side heat exchanger 3 and the second heat source side heat exchanger 4 connected in parallel.
  • the refrigeration cycle device 1b of the second modification controls the opening and closing of each valve during the defrosting operation to first intensively defrost the first heat source side heat exchanger 3, and then the remaining second heat source side heat. By intensively defrosting the exchanger 4, defrosting can be performed reliably and efficiently.
  • the determination means 52 determines the timing at which the main defrost target is switched from the first heat source side heat exchanger 3 to the second heat source side heat exchanger 4 based on the temperature Tn1 of the refrigerant. Therefore, the determination means 52 can more accurately determine the state of whether or not frost remains in the first heat source side heat exchanger 3 than the time t1 measured by the timer 53. Further, according to the second modification, the timer 53 may not be provided in the control device 30.
  • Modification example 3 is a case where three or more heat source side heat exchangers are connected in parallel in the refrigeration cycle apparatus 1 shown in FIG.
  • the same components as those described with reference to FIGS. 1 to 10 are designated by the same reference numerals, and detailed description thereof will be omitted.
  • FIG. 11 is a refrigerant circuit diagram showing a configuration example of the refrigeration cycle device of the modified example 3.
  • the third heat source side heat exchanger 8 connected in parallel with the first heat source side heat exchanger 3 and the second heat source side heat exchanger 4 It is provided.
  • the third heat source side heat exchanger 8 is connected to the gas pipe 41 via the third gas pipe 43c, and is connected to the liquid pipe 47 via the third liquid pipe 44c.
  • the third liquid pipe 44c is provided with a refrigerant temperature sensor 12c and a second flow rate adjusting valve 9b.
  • the refrigerant temperature sensor 12c detects the temperature Tn3 of the refrigerant flowing through the third liquid pipe 44c.
  • the determination means 52 compares the temperature Tn3 of the refrigerant with the predetermined temperature threshold Td, and when the temperature Tn3 of the refrigerant becomes equal to or higher than the temperature threshold Td, the defrosting target is switched.
  • the first flow rate adjusting valve 9a and the second flow rate adjusting valve 9b have the same configuration as the flow rate adjusting valve 9, and the refrigerant temperature sensor 12c has the same configuration as the refrigerant temperature sensor 12. Omit.
  • the operation of the refrigeration cycle device 1c of the second modification will be described with reference to FIG.
  • a process different from the process shown in FIG. 10 will be described, and detailed description of the process similar to the process described with reference to FIG. 10 will be omitted.
  • the on-off valve 7, the first flow rate adjusting valve 9a, and the second flow rate adjusting valve 9b are in the open state.
  • step S203 when the first defrosting means 54 receives the defrosting start information from the determining means 52, the first flow rate adjusting valve 9a is maintained in the open state, and the on-off valve 7 and the second flow rate adjusting valve 9b are closed.
  • step S206 the second defrosting means 55 closes the first flow rate adjusting valve 9a.
  • step S207 when the temperature Tn2 of the refrigerant becomes equal to or higher than the temperature threshold value Tb, the determination means 52 transmits the switching instruction information to the second defrosting means 55.
  • the second defrosting means 55 receives the switching instruction information from the determining means 52, the second defrosting means 55 closes the on-off valve 7 and opens the second flow rate adjusting valve 9b.
  • the determination means 52 determines whether or not the temperature Tn3 of the refrigerant detected by the refrigerant temperature sensor 12c is equal to or higher than the temperature threshold value Td after transmitting the switching instruction information to the second defrosting means 55 based on the determination result in step S207. To do. When the temperature Tn3 of the refrigerant becomes equal to or higher than the temperature threshold value Td, the determination means 52 determines that the defrosting of the heat source side heat exchanger 15 has been completed, and sends the defrosting end information to the second defrosting means 55 and the refrigeration cycle control means 51. Send to. After that, the control device 30 performs the processes of steps S208 and S209.
  • FIG. 11 shows a case where three heat source side heat exchangers are connected in parallel
  • the number of heat source side heat exchangers connected in parallel may be four or more.
  • a flow rate adjusting device and a refrigerant temperature sensor are provided on the liquid piping side of each heat source side heat exchanger.
  • the determination means 52 may determine the timing of switching the defrosting target based on the time t1 measured by the timer 53 shown in FIG. In this case, the refrigerant temperature sensors 12a to 12c may not be provided.
  • Embodiment 2 The refrigeration cycle apparatus of the second embodiment is a case where a header for dividing and merging the flowing refrigerant is provided in the heat source side heat exchanger.
  • the same components as those described in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
  • FIG. 12 is a refrigerant circuit diagram showing a configuration example of the refrigeration cycle device according to the second embodiment.
  • the refrigeration cycle device 1d has a heat source side unit 10d.
  • the first gas header 61 is provided on the first gas pipe 43a side of the first heat source side heat exchanger 3, and the first liquid header 61 is provided on the first liquid pipe 44a side of the first heat source side heat exchanger 3.
  • 62 is provided.
  • the second gas header 63 is provided on the second gas pipe 43b side of the second heat source side heat exchanger 4, and the second gas header 63 is provided on the second liquid pipe 44b side of the second heat source side heat exchanger 4.
  • a liquid header 64 is provided.
  • FIG. 13 is a side view showing a configuration example of the first heat source side heat exchanger shown in FIG.
  • FIG. 14 is a side view showing a configuration example of the second heat source side heat exchanger shown in FIG.
  • the X-axis and the Z-axis are shown in the figure to define the direction.
  • the direction opposite to the Z-axis arrow shown in FIGS. 13 and 14 is the direction of gravity.
  • the solid arrows shown in FIGS. 13 and 14 indicate the flow direction of the refrigerant when the refrigerating cycle device 1 performs the cooling operation and the defrosting operation.
  • the broken line arrows shown in FIGS. 13 and 14 indicate the flow direction of the refrigerant when the refrigeration cycle device 1 performs the heating operation.
  • the first heat source side heat exchanger 3 has a plurality of heat transfer tubes 45a and a plurality of heat radiation fins 46a.
  • the first gas pipe 43a is connected to the first gas header 61.
  • the position where the first gas pipe 43a is connected to the first gas header 61 is the central portion of the height which is the length of the first gas header 61 in the direction perpendicular to the ground (Z-axis arrow direction).
  • the central portion includes not only the exact center position of the height of the first gas header 61 but also a height in a certain range with respect to the center position.
  • the first liquid pipe 44a is connected to the lower part of the first liquid header 62.
  • the first gas header 61 divides the refrigerant flowing from the first gas pipe 43a into the plurality of heat transfer pipes 45a when the refrigerating cycle device 1 performs the cooling operation and the defrosting operation.
  • the first gas header 61 merges the refrigerants flowing in from the plurality of heat transfer pipes 45a and flows out to the first gas pipe 43a.
  • the second heat source side heat exchanger 4 has a plurality of heat transfer tubes 45b and a plurality of heat radiation fins 46b.
  • the second gas pipe 43b is connected to the second gas header 63.
  • the position where the second gas pipe 43b is connected to the second gas header 63 is the central portion of the height which is the length of the second gas header 63 in the direction perpendicular to the ground (Z-axis arrow direction).
  • the central portion includes not only the exact center position of the height of the second gas header 63 but also a certain range of heights based on the center position.
  • the second liquid pipe 44b is connected to the lower part of the second liquid header 64.
  • the second gas header 63 divides the refrigerant flowing from the second gas pipe 43b into the plurality of heat transfer pipes 45b when the refrigerating cycle device 1 performs the cooling operation and the defrosting operation.
  • the second gas header 63 merges the refrigerants flowing in from the plurality of heat transfer pipes 45b and flows out to the second gas pipe 43b.
  • the height of the first heat source side heat exchanger 3 and the height of the second heat source side heat exchanger 4 are the same, and the number of heat transfer tubes 45a and the number of heat transfer tubes 45b are the same.
  • Is. 13 and 14 show the case where the number of heat transfer tubes 45a and the number of heat transfer tubes 45b is 13, but the number of heat transfer tubes 45a and 45b is not limited to 13.
  • FIG. 15 is a refrigerant circuit diagram showing a configuration example of a refrigeration cycle device of a comparative example.
  • the same components as those described with reference to FIGS. 1 and 12 are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the refrigeration cycle device 100 of the comparative example has a heat source side unit 110, load side units 20a and 20b, and a control device 130.
  • a refrigerant temperature sensor 121 is provided in the liquid pipe 47 on the downstream side of the position where the first liquid pipe 44a and the second liquid pipe 44b meet, with reference to the direction in which the refrigerant flows during the defrosting operation.
  • the refrigerant temperature sensor 121 detects the temperature Tr of the refrigerant flowing through the liquid pipe 47, and transmits information on the temperature Tr of the refrigerant to the control device 130. Since the hardware configuration of the control device 130 is the same as the configuration described with reference to FIGS. 3 and 4, detailed description thereof will be omitted.
  • the control device 130 compares the temperature Tr of the refrigerant with the predetermined temperature threshold Tc. Then, the control device 130 determines that the defrosting is completed when the temperature Tr of the refrigerant becomes equal to or higher than the temperature threshold value Tc.
  • the temperature threshold Tc is, for example, 10 ° C.
  • the temperature thresholds Tb and Tc have a relationship of Tc> Tb. Further, when the temperature threshold value Tc is compared with the temperature threshold value Ta described in the second modification, the relationship is Ta ⁇ Tc.
  • FIG. 16 is a flowchart showing an example of the operation procedure of the refrigeration cycle device of the comparative example shown in FIG. It is assumed that the refrigeration cycle device 100 is in the heating operation before starting the operation procedure shown in FIG.
  • the control device 130 determines whether or not the temperature Te of the refrigerant is equal to or higher than the temperature threshold value T0 (step S1001). In step S1001, the control device 130 determines that frost has adhered to the heat source side heat exchanger 15 when the temperature Te of the refrigerant becomes equal to or lower than the temperature threshold value T0, and controls the flow path switching device 5 to switch the flow path ( Step S1002). As a result, the refrigerant discharged from the compressor 2 flows into the heat source side heat exchanger 15 via the flow path switching device 5.
  • the control device 130 determines whether or not the temperature Tr of the refrigerant is equal to or higher than the temperature threshold value Tc (step S1003).
  • step S1003 when the temperature Tr of the refrigerant becomes equal to or higher than the temperature threshold value Tc, the control device 130 determines that the defrosting of the heat source side heat exchanger 15 has been completed, and controls the flow path switching device 5 to switch the flow path. (Step S1004).
  • the operation mode of the refrigeration cycle device 100 returns from the defrosting operation to the heating operation.
  • the gas refrigerant flows into the central portion of the first gas header 61 from the first gas pipe 43a.
  • the gas refrigerant that has flowed into the first gas header 61 is diverted to the plurality of heat transfer tubes 45a, but due to the pressure loss, the refrigerant tends to stay in the heat transfer tubes 45a on the lower stage side of the first heat source side heat exchanger 3.
  • the second heat source side heat exchanger 4 shown in FIG. 14 also has a refrigerant in the heat transfer tube 45b on the lower stage side of the second heat source side heat exchanger 4 during the defrosting operation. Is likely to stay.
  • FIG. 17 is a graph showing an example of the relationship between the flow rate of the refrigerant and the position of the heat exchanger on the heat source side during the defrosting operation.
  • the horizontal axis of FIG. 17 shows the flow rate of the refrigerant
  • the vertical axis shows the height Hu of the heat transfer tube 45a in the vertical direction (Z-axis arrow direction) of the first heat source side heat exchanger 3 shown in FIG.
  • the height of the lowermost heat transfer tube 45a is Hu1
  • the height of the uppermost heat transfer tube 45a is Hun. ..
  • FIG. 17 shows an example of the relationship between the flow rate of the refrigerant and the position of the heat exchanger on the heat source side during the defrosting operation.
  • the horizontal axis of FIG. 17 shows the flow rate of the refrigerant
  • the vertical axis shows the height Hu of the heat transfer tube 45a in the vertical direction (Z-axis arrow direction) of the first heat source side heat exchanger 3 shown in FIG.
  • the solid line graph is the case of the refrigeration cycle device 1d of the second embodiment, and the broken line graph is the case of the refrigeration cycle device 100 of the comparative example shown in FIG. Further, since the second heat source side heat exchanger 4 has the same tendency as the graph shown in FIG. 17, the description of the second heat source side heat exchanger 4 will be omitted here.
  • the heat exchange on the heat source side is shown as shown in the graph of the broken line in FIG.
  • the flow rate of the refrigerant on the lower stage side is smaller than that on the upper stage side in the vessel 15. This is because, as described with reference to FIGS. 13 and 14, when the refrigerant flows from the central portion of the header to the plurality of heat transfer tubes, the flow of the refrigerant becomes stagnant due to the pressure loss, and the refrigerant flows on the lower side. This is because it tends to stay.
  • the refrigeration cycle device 100 of the comparative example it takes a long time to complete the defrosting of the heat source side heat exchanger 15 in consideration of the flow rate of the refrigerant flowing through the lower heat transfer tube of the heat source side heat exchanger 15. It is required and the temperature threshold Tc is set to a high value. As a result, as shown in the broken line graph of FIG. 17, the refrigerant flows wastefully on the upper side until the defrosting of the heat transfer tube on the lower side of the heat source side heat exchanger 15 is completed.
  • the refrigerant flow rate has an influence on the difference in the height of the heat transfer tube 45a in the first heat source side heat exchanger 3. Is smaller than that of the comparative example, and the refrigerant is evenly distributed by the plurality of heat transfer tubes 45a. Therefore, the temperature threshold value Tb can be set to a temperature lower than the temperature threshold value Tc, and defrosting can be performed more efficiently than in the comparative example.
  • the first gas header 61 that divides the refrigerant flowing into the first heat source side heat exchanger 3 into the plurality of heat transfer tubes 45a during the defrosting operation, and the second heat source side heat. It has a second gas header 63 that divides the refrigerant flowing into the exchanger 4 into the plurality of heat transfer tubes 45b.
  • the first gas pipe 43a is connected to the central portion of the first gas header 61 in the direction of gravity
  • the second gas pipe 43b is connected to the central portion of the second gas header 63 in the direction of gravity.
  • the first heat source side heat exchanger 3 and the second heat source side heat exchanger are adjusted by adjusting the opening degree of the on-off valve 7 as described in the first embodiment during the defrosting operation.
  • the flow rate of the refrigerant flowing in each of 4 increases.
  • the frost adhering to the lower side of the heat source side heat exchanger can be reliably and efficiently removed. Since the temperature thresholds Ta and Tb can be set to values smaller than the temperature threshold Tc of the comparative example, the defrosting time is shorter than that of the comparative example, and defrosting can be performed efficiently.
  • Embodiment 3 In the refrigeration cycle apparatus of the third embodiment, the number of heat transfer tubes of the first heat source side heat exchanger and the number of heat transfer tubes of the second heat source side heat exchanger are different.
  • the same components as those described in the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.
  • FIG. 18 is a refrigerant circuit diagram showing a configuration example of the refrigeration cycle device according to the third embodiment.
  • the refrigeration cycle device 1e has a heat source side unit 10e.
  • the first heat source side heat exchanger 3 provided in the heat source side unit 10e has a configuration in which the first divided heat exchanger 3-1 and the second divided heat exchanger 3-2 are connected in parallel.
  • the first gas pipe 43a is branched into gas branch pipes 43a-1 and 43-2.
  • the gas branch pipe 43a-1 is connected to the first split heat exchanger 3-1 and the gas branch pipe 43a-2 is connected to the second split heat exchanger 3-2.
  • the first liquid pipe 44a is branched into liquid branch pipes 44a-1 and 44a-2.
  • the liquid branch pipe 44a-1 is connected to the first split heat exchanger 3-1 and the liquid branch pipe 44a-2 is connected to the second split heat exchanger 3-2.
  • the first gas header 61 is provided on the gas branch pipe 43a-1 side, and the first liquid header 62 is provided on the liquid branch pipe 44a-1 side.
  • the first gas header 65 is provided on the gas branch pipe 43a-2 side, and the first liquid header 66 is provided on the liquid branch pipe 44a-2 side. Since the first gas header 65 has the same configuration as the first gas header 61 and the first liquid header 66 has the same configuration as the first liquid header 62, detailed description thereof will be omitted.
  • FIG. 19 is an external perspective view showing a configuration example of the heat source side unit shown in FIG.
  • FIG. 20 is an external perspective view of the heat source side unit shown in FIG. 18 when viewed from a direction different from that in the case of FIG.
  • the first split heat exchanger 3-1 and the second split heat exchanger 3-2 have the same height, which is the length in the direction perpendicular to the ground (Z-axis arrow direction), and the height is L1. And.
  • the height of the second heat source side heat exchanger 4 is L2
  • the heights L1 and L2 have a relationship of L2 ⁇ L1.
  • FIG. 21 is a schematic view showing the layout of the heat source side heat exchanger when the heat source side unit shown in FIG. 20 is viewed from above.
  • the shapes of the first split heat exchanger 3-1 and the second split heat exchanger 3-2 when viewed from above are L-shaped.
  • the shape of the second heat source side heat exchanger 4 when viewed from above is linear.
  • the first split heat exchanger 3-1 is L-shaped, but when the first split heat exchanger 3-1 is extended in a straight line, the first split heat exchanger 3-1
  • the linear length of the second heat source side heat exchanger 4 is equal to the linear length of the second heat source side heat exchanger 4.
  • FIG. 22 is a side view showing a configuration example of the first split heat exchanger shown in FIG. Since the second split heat exchanger 3-2 has the same configuration as the first split heat exchanger 3-1, the description shown in FIG. 22 is omitted. Further, FIG. 22 shows a state in which the L-shaped first split heat exchanger 3-1 shown in FIG. 21 is linearly extended.
  • FIG. 23 is a side view showing a configuration example of the second heat source side heat exchanger shown in FIG. In FIGS. 22 and 23, the X-axis and the Z-axis are shown in the drawings for convenience of explanation, but the X-axis arrows correspond to the X-axis arrows shown in FIGS. 19 and 20. It does not have to be.
  • the number of heat transfer tubes 45a of the first split heat exchanger 3-1 shown in FIG. 22 is 13.
  • the number of heat transfer tubes 45b of the second heat source side heat exchanger 4 shown in FIG. 23 is nine.
  • the number of heat transfer tubes 45a of the first split heat exchanger 3-1 is larger than the number of heat transfer tubes 45b of the second heat source side heat exchanger 4.
  • the ratio of the number of heat transfer tubes 45a of the first split heat exchanger 3-1 to the number of heat transfer tubes 45b of the second heat source side heat exchanger 4 is the height L1 of the first heat source side heat exchanger 3 and the second.
  • the ratio (L1: L2) of the heat source side heat exchanger 4 to the height L2 is close to 3: 2.
  • the first heat source side heat exchanger 3 and the second heat source side heat exchanger 3 For 4 compare the number of heat transfer tubes to be defrosted.
  • the number of heat transfer tubes 45a of the first split heat exchanger 3-1 is (3/2) times the number of heat transfer tubes 45b of the second heat source side heat exchanger 4 from the ratio of L1 / L2. Since the first split heat exchanger 3-1 and the second split heat exchanger 3-2 have the same number of heat transfer tubes 45a, the number of heat transfer tubes 45a of the first heat source side heat exchanger 3 is the second heat source side heat exchange.
  • FIGS. 22 and 22 This is three times the number of heat transfer tubes 45b of the vessel 4.
  • the number of heat transfer tubes 45a of the first split heat exchanger 3-1 and the second split heat exchanger 3-2 and the number of heat transfer tubes 45b of the second heat source side heat exchanger 4 are shown in FIGS. 22 and 22. It is not limited to the case shown in 23.
  • the on-off valve 7 since the on-off valve 7 is closed from the start of the defrosting operation by the process of step S102 until the time t1 reaches the time threshold value tth1, the defrosting of the first heat source side heat exchanger 3 is concentrated. Is done. After that, the on-off valve 7 opens, and defrosting of the second heat source side heat exchanger 4 is disclosed, but the refrigerant also flows to the first heat source side heat exchanger 3. The amount of the refrigerant flowing through the first heat source side heat exchanger 3 is larger than the amount of the refrigerant flowing through the second heat source side heat exchanger 4.
  • the refrigeration cycle device 1e is the second heat source side heat exchanger.
  • the defrosting of the first heat source side heat exchanger 3 can be completed at the timing of the completion of defrosting of 4.
  • the number of heat transfer tubes 45a of the first heat source side heat exchanger 3 is larger than the number of heat transfer tubes of the second heat source side heat exchanger 4. According to the third embodiment, since the amount of the refrigerant flowing in the first heat source side heat exchanger 3 is larger than the amount of the refrigerant flowing in the second heat source side heat exchanger 4, the second heat source side heat exchanger 4 The defrosting of the first heat source side heat exchanger 3 can be completed at the timing of the end of defrosting.
  • Modification example 4 The refrigeration cycle device of the modified example 4 is a case where the flow rate adjusting valve 9 is provided in the first liquid pipe 44a in the refrigerant circuits 60a and 60b shown in FIG.
  • the same components as those described with reference to FIGS. 18 to 23 are designated by the same reference numerals, and detailed description thereof will be omitted.
  • FIG. 24 is a refrigerant circuit diagram showing a configuration example of the refrigeration cycle device of the modified example 4.
  • the flow rate adjusting valve 9 is provided in the first liquid pipe 44a.
  • the operation of the refrigeration cycle device 1f is shown in FIG. 10 except that the timing of switching the defrost target is determined based on the time t1 measured by the timer 53 in step S207 shown in FIG. Since the procedure is the same, the detailed description thereof will be omitted.
  • the refrigerant temperature sensor 12 may be provided in the liquid pipe 47 near the confluence of the first liquid pipe 44a and the second liquid pipe 44b instead of the second liquid pipe 44b.
  • a valve for shutting off the flow of the refrigerant is provided in each of the liquid pipes of the first heat source side heat exchanger 3 and the second heat source side heat exchanger 4.
  • the refrigeration cycle device 1f of the modified example 4 controls the opening and closing of each valve during the defrosting operation to first defrost the first heat source side heat exchanger 3, and then the remaining second heat source side heat exchanger 4 By defrosting, defrosting can be performed reliably and efficiently.
  • the third embodiment may be applied to the refrigeration cycle device 1 described in the first embodiment. .. Further, in each of the second and third embodiments, any of the modified examples 1 to 3 may be combined.

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

Abstract

La présente invention concerne un dispositif à cycle frigorifique comprenant : un compresseur ; un détendeur ; un échangeur de chaleur côté charge ; un dispositif de commutation de circuit d'écoulement ; un échangeur de chaleur côté source de chaleur comportant un premier échangeur de chaleur côté source de chaleur et un second échangeur de chaleur côté source de chaleur, reliés en parallèle entre le dispositif de commutation de circuit d'écoulement et le détendeur ; une soupape d'ouverture/fermeture destinée au fluide frigorigène coulant pendant un fonctionnement de dégivrage, et disposée du côté aval du second échangeur de chaleur côté source de chaleur ; et un dispositif de commande destiné à commander, lors de la réalisation du fonctionnement de dégivrage, le dispositif de commutation de circuit d'écoulement de sorte que le fluide frigorigène évacué du compresseur coule vers l'échangeur de chaleur côté source de chaleur. Le dispositif de commande comprend : un premier moyen de dégivrage destiné à commuter la soupape d'ouverture/fermeture d'un état ouvert à un état fermé lors du démarrage du fonctionnement de dégivrage ; un moyen de détermination destiné à déterminer le moment propice pour commuter l'objet à être dégivré ; et un second moyen de dégivrage destiné à commuter la soupape d'ouverture/fermeture d'un état fermé à un état ouvert en fonction du moment propice déterminé par le moyen de détermination.
PCT/JP2019/044375 2019-11-12 2019-11-12 Dispositif à cycle frigorifique WO2021095124A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US17/641,551 US20220299247A1 (en) 2019-11-12 2019-11-12 Refrigeration cycle apparatus
PCT/JP2019/044375 WO2021095124A1 (fr) 2019-11-12 2019-11-12 Dispositif à cycle frigorifique
JP2021555660A JP7183447B2 (ja) 2019-11-12 2019-11-12 冷凍サイクル装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/044375 WO2021095124A1 (fr) 2019-11-12 2019-11-12 Dispositif à cycle frigorifique

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04344085A (ja) * 1991-05-17 1992-11-30 Daikin Ind Ltd 冷凍装置の除霜運転制御装置
JPH11304309A (ja) * 1998-04-20 1999-11-05 Fujitsu General Ltd 空気調和機
JP2002089980A (ja) * 2000-09-20 2002-03-27 Fujitsu General Ltd 空気調和機
JP2008039298A (ja) * 2006-08-07 2008-02-21 Denso Corp ヒートポンプサイクル
JP2015224829A (ja) * 2014-05-28 2015-12-14 ダイキン工業株式会社 冷凍装置
WO2016001957A1 (fr) * 2014-06-30 2016-01-07 日立アプライアンス株式会社 Climatiseur

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1327610B1 (fr) 1997-11-20 2004-07-21 Glasstech, Inc. Méthode pour former une feuille de verre

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04344085A (ja) * 1991-05-17 1992-11-30 Daikin Ind Ltd 冷凍装置の除霜運転制御装置
JPH11304309A (ja) * 1998-04-20 1999-11-05 Fujitsu General Ltd 空気調和機
JP2002089980A (ja) * 2000-09-20 2002-03-27 Fujitsu General Ltd 空気調和機
JP2008039298A (ja) * 2006-08-07 2008-02-21 Denso Corp ヒートポンプサイクル
JP2015224829A (ja) * 2014-05-28 2015-12-14 ダイキン工業株式会社 冷凍装置
WO2016001957A1 (fr) * 2014-06-30 2016-01-07 日立アプライアンス株式会社 Climatiseur

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US20220299247A1 (en) 2022-09-22
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