WO2019187760A1 - Dispositif de climatisation - Google Patents

Dispositif de climatisation Download PDF

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Publication number
WO2019187760A1
WO2019187760A1 PCT/JP2019/005705 JP2019005705W WO2019187760A1 WO 2019187760 A1 WO2019187760 A1 WO 2019187760A1 JP 2019005705 W JP2019005705 W JP 2019005705W WO 2019187760 A1 WO2019187760 A1 WO 2019187760A1
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Prior art keywords
indoor
refrigerant
indoor units
unit
indoor unit
Prior art date
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Ceased
Application number
PCT/JP2019/005705
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English (en)
Japanese (ja)
Inventor
稔弘 関根
佑 廣崎
慎太郎 真田
亮 ▲高▼岡
光哉 青木
達朗 山▲崎▼
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Fujitsu General Ltd
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Fujitsu General Ltd
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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
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof

Definitions

  • the present invention relates to an air conditioner.
  • An air conditioner such as a multi air conditioning system for buildings has a refrigerant circuit in which an outdoor unit and a plurality of indoor units are connected by a refrigerant pipe, and circulates the refrigerant in the refrigerant circuit to use heat dissipation or heat absorption of the refrigerant. Heating or cooling the air-conditioned space is performed by overheating or cooling.
  • the number of indoor units connected to the outdoor unit increases, and as the length of the refrigerant pipe connecting the outdoor unit to each indoor unit increases, the amount of refrigerant charged in the refrigerant circuit increases. Become more.
  • the refrigerant charge amount of the refrigerant circuit is set to a regulated charge amount that is smaller than the maximum charge amount that is the refrigerant charge amount that can exert the maximum capacity of each indoor unit in all indoor units.
  • a technology for performing rotation operation in which the number of operating units is limited when the number of operating indoor units is large (for example, Patent Document 1).
  • priority is set according to the temperature difference between the room temperature and the set temperature in each indoor unit. Specifically, the priority is set higher as the temperature difference is smaller. That is, when the room temperature is close to the set temperature, the required capacity is small and the influence when the operation is stopped is small.
  • the operation is preferentially stopped during the rotation operation.
  • it is not possible to consider the priority of indoor units having the same temperature difference, the case where there is a sudden change in the heat load on the indoor unit side, or the like. As a result, the user may feel uncomfortable.
  • the present invention solves the above-described problems, and an object of the present invention is to provide an air conditioner that can reduce the discomfort of the user when performing the rotation operation.
  • an air conditioner of the present invention has a refrigerant circuit in which an outdoor unit and a plurality of indoor units are connected by a refrigerant pipe, and the refrigerant circulates through the refrigerant circuit so that each indoor unit is The cooling operation or heating operation of the installed air-conditioned space is performed, and the refrigerant filling amount of the refrigerant circuit is smaller than the maximum filling amount that is the refrigerant filling amount that can exert the maximum capacity of each indoor unit in all indoor units. Regulated filling amount.
  • the total required capacity which is the sum of the required capacities of all indoor units, exceeds the threshold required capacity, which is the sum of the maximum capacities that can be exhibited by each indoor unit when the regulated charge amount of refrigerant is filled.
  • the ratio of the threshold required capacity to the sum of the maximum capacity of each indoor unit is calculated, and some indoor units are stopped so that the number of operating indoor units is equal to or less than the ratio.
  • the air conditioner of the present invention configured as described above, when the required capacity cannot be exhibited in all indoor units by reducing the refrigerant charging amount by replacing the flammable refrigerant with replacement, Since the stop indoor unit is changed every predetermined time, user discomfort can be reduced.
  • FIG. 1A is a refrigerant circuit diagram of an air-conditioning apparatus according to an embodiment of the present invention.
  • FIG. 1B is a block diagram of an outdoor unit control unit and an indoor unit control unit of the air conditioner according to the embodiment of the present invention.
  • FIG. 2 is a diagram illustrating an installation state of the indoor unit and the outdoor unit in the embodiment of the present invention.
  • FIG. 3 is a stop indoor unit selection table in the embodiment of the present invention.
  • FIG. 4 is a flowchart showing processing of the outdoor unit control unit in the embodiment of the present invention.
  • FIG. 5 is a flowchart showing processing of the outdoor unit control unit in the embodiment of the present invention.
  • FIG. 6 is a flowchart showing processing of the outdoor unit control unit in the embodiment of the present invention.
  • FIG. 7 is a flowchart showing processing of the outdoor unit control unit in the embodiment of the present invention.
  • an outdoor unit and a plurality of indoor units corresponding to a flammable refrigerant from an outdoor unit and a plurality of indoor units corresponding to the non-flammable refrigerant are used.
  • the refrigerant pipe that connects the outdoor unit and the plurality of indoor units will be described as an example of an air conditioner that uses an existing refrigerant pipe.
  • the present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention.
  • the air conditioner 1 in the present embodiment is installed in a room 300 that is an air-conditioned space, the outdoor unit 2 installed in the room 300, and the outdoor unit 2.
  • Twenty indoor units 5a to 5t having the same ability to be connected in parallel with the existing liquid pipe 8 and gas pipe 9 by electric wiring 10 are provided.
  • one end of the liquid pipe 8 is connected to the closing valve 25 of the outdoor unit 2, and the other end of the liquid pipe 8 is branched and connected to the liquid pipe connection portions 53a to 53t of the indoor units 5a to 5t. Yes.
  • One end of the gas pipe 9 is connected to the closing valve 26 of the outdoor unit 2, and the other end of the gas pipe 9 is branched and connected to the gas pipe connecting portions 54a to 54t of the indoor units 5a to 5t.
  • the outdoor unit 2 and the ten indoor units 5a to 5t are connected to each other to constitute the refrigerant circuit 100 of the air conditioner 1.
  • One end of the electrical wiring 10 is connected to a communication unit 230 of the outdoor unit 2 described later, and the other end of the electrical wiring 10 is branched and connected to communication units 530a to 530t of the indoor units 5a to 5t described later. .
  • FIG. 1A shows only the indoor unit 5a, the indoor unit 5b, and the indoor unit 5t among the 20 indoor units 5a to 5t.
  • the refrigerant circuit 100 uses a flammable refrigerant having a low GWP, such as HFO1234yf, R32, or a mixed refrigerant containing these.
  • the outdoor unit 2 and the 20 indoor units 5a to 5t described below are designed so that each corresponds to a combustible refrigerant.
  • the air conditioner 1 originally has an outdoor unit (hereinafter referred to as an old outdoor unit) corresponding to a non-combustible refrigerant such as R410A and 20 indoor units (hereinafter referred to as an old indoor unit).
  • the outdoor unit 2 includes a compressor 21, a four-way valve 22, an outdoor heat exchanger 23, an outdoor expansion valve 24, a closing valve 25 to which one end of the liquid pipe 8 is connected, and one end of the gas pipe 9.
  • a closing valve 26, an accumulator 28, and an outdoor fan 27 are provided. These devices other than the outdoor fan 27 are connected to each other through refrigerant pipes described in detail below to constitute an outdoor unit refrigerant circuit 20 that forms part of the refrigerant circuit 100.
  • the compressor 21 is a variable capacity compressor capable of changing the operation capacity by being driven by a motor (not shown) whose rotation speed is controlled by an inverter.
  • the refrigerant discharge side of the compressor 21 is connected to a port a of a four-way valve 22 described later by a discharge pipe 41, and the refrigerant suction side of the compressor 21 is connected to the refrigerant outflow side of the accumulator 28 by a suction pipe 42.
  • the four-way valve 22 is a valve for switching the direction in which the refrigerant flows, and has four ports a, b, c, and d.
  • the port a is connected to the refrigerant discharge side of the compressor 21 by the discharge pipe 41 as described above.
  • the port b is connected to one refrigerant inlet / outlet of the outdoor heat exchanger 23 by a refrigerant pipe 43.
  • the port c is connected to the refrigerant inflow side of the accumulator 28 by a refrigerant pipe 46.
  • the port d is connected to the closing valve 26 by an outdoor unit gas pipe 45.
  • the outdoor heat exchanger 23 exchanges heat between the refrigerant and the outside air taken into the outdoor unit 2 by the rotation of the outdoor fan 27 described later.
  • one refrigerant inlet / outlet of the outdoor heat exchanger 23 is connected to the port b of the four-way valve 22 by the refrigerant pipe 43, and the other refrigerant inlet / outlet is connected to the closing valve 25 by the outdoor unit liquid pipe 44.
  • the outdoor expansion valve 24 is provided in the outdoor unit liquid pipe 44.
  • the outdoor expansion valve 24 is an electronic expansion valve.
  • the air-conditioning apparatus 1 performs a heating operation, that is, when the outdoor heat exchanger 23 functions as an evaporator, the compressor 21 detected by a discharge temperature sensor 33 described later.
  • the opening degree is adjusted in accordance with the discharge temperature, so that the discharge temperature does not exceed the performance upper limit value. Further, when the air conditioner 1 is performing a cooling operation, that is, when the outdoor heat exchanger 23 functions as a condenser, the opening degree is fully opened.
  • the outdoor fan 27 is formed of a resin material and is disposed in the vicinity of the outdoor heat exchanger 23.
  • the outdoor fan 27 is rotated by a fan motor (not shown) to take outside air from a suction port (not shown) into the outdoor unit 2, and the outdoor air heat exchanged with the refrigerant in the outdoor heat exchanger 23 is sent from the blower outlet (not shown) to the outdoor unit 2. To the outside.
  • the accumulator 28 has the refrigerant inflow side connected to the port c of the four-way valve 22 by the refrigerant pipe 46 and the refrigerant outflow side connected to the refrigerant intake side of the compressor 21 by the suction pipe 42.
  • the accumulator 28 separates the refrigerant flowing into the accumulator 28 from the refrigerant pipe 46 into a gas refrigerant and a liquid refrigerant, and causes the compressor 21 to suck only the gas refrigerant.
  • the outdoor unit 2 is provided with various sensors.
  • the discharge pipe 41 includes a discharge pressure sensor 31 that detects the pressure of the refrigerant discharged from the compressor 21 and a discharge temperature sensor 33 that detects the temperature of the refrigerant discharged from the compressor 21. Is provided. Near the refrigerant inlet of the accumulator 28 in the refrigerant pipe 46, a suction pressure sensor 32 that detects the pressure of the refrigerant sucked into the compressor 21 and a suction temperature sensor 34 that detects the temperature of the refrigerant sucked into the compressor 21. Is provided.
  • the temperature of the refrigerant flowing into the outdoor heat exchanger 23 or the temperature of the refrigerant flowing out of the outdoor heat exchanger 23 is detected.
  • a heat exchanger temperature sensor 35 is provided.
  • An outdoor air temperature sensor 36 that detects the temperature of the outside air that flows into the outdoor unit 2, that is, the outside air temperature, is provided near the suction port (not shown) of the outdoor unit 2.
  • the outdoor unit 2 is provided with an outdoor unit control means 200.
  • the outdoor unit control means 200 is mounted on a control board stored in an electrical component box (not shown) of the outdoor unit 2.
  • the outdoor unit control means 200 includes a CPU 210, a storage unit 220, a communication unit 230, and a sensor input unit 240.
  • the storage unit 220 includes a ROM and a RAM, and stores detection values corresponding to detection programs from the control program of the outdoor unit 2 and various sensors, control states of the compressor 21 and the outdoor fan 27, and the like.
  • the communication unit 230 is an interface that performs communication with the indoor units 5a to 5c.
  • the sensor input unit 240 captures detection results from various sensors of the outdoor unit 2 and outputs them to the CPU 210.
  • CPU210 takes in the detection result in each sensor of outdoor unit 2 mentioned above via sensor input part 240.
  • the CPU 210 performs drive control of the compressor 21 and the outdoor fan 27 based on the detection results and control signals taken in.
  • the CPU 210 performs switching control of the four-way valve 22 based on the detection results and control signals taken in.
  • the CPU 210 adjusts the opening degree of the outdoor expansion valve 24 based on the acquired detection result and control signal.
  • the 20 indoor units 5a to 5t will be described.
  • Twenty indoor units 5a to 5t branch to indoor heat exchangers 51a to 51t, indoor expansion valves 52a to 52t, and liquid pipe connection portions 53a to 53t to which the other end of the branched liquid pipe 8 is connected.
  • Gas pipe connection parts 54a to 54t to which the other ends of the gas distribution pipes 9a to 9c are connected and indoor fans 55a to 55t are provided.
  • These devices other than the indoor fans 55a to 55t are connected to each other through refrigerant pipes that will be described in detail below to constitute indoor unit refrigerant circuits 50a to 50t that form part of the refrigerant circuit 100.
  • the configuration of the 20 indoor units 5a to 5t will be described in detail. Since all the indoor units 5a to 5t have the same configuration, the following description will be made in detail by taking the indoor unit 5a as an example, and detailed explanation will be omitted for the other indoor units 5b to 5t. Further, in FIG. 1A, the constituent units of the indoor units 5b to 5t corresponding to the constituent units of the indoor unit 5a are obtained by changing the numbers assigned to the constituent units of the indoor unit 5a from a to b to t, respectively. .
  • the indoor heat exchanger 51a exchanges heat between the refrigerant and room air taken into the indoor unit 5a through a suction port (not shown) by rotation of an indoor fan 55a described later, and one refrigerant inlet / outlet is connected to a liquid pipe.
  • the indoor unit liquid pipe 71a is connected to the section 53a, and the other refrigerant inlet / outlet is connected to the gas pipe connecting section 54a through the indoor unit gas pipe 72a.
  • the indoor heat exchanger 51a functions as an evaporator when the indoor unit 5a performs a cooling operation, and functions as a condenser when the indoor unit 5a performs a heating operation.
  • the refrigerant pipes of the liquid pipe connecting part 53a and the gas pipe connecting part 54a are connected by welding, flare nuts, or the like.
  • the indoor expansion valve 52a is provided in the indoor unit liquid pipe 71a.
  • the indoor expansion valve 52a is an electronic expansion valve, and when the indoor heat exchanger 51a functions as an evaporator, that is, when the indoor unit 5a performs a cooling operation, the opening degree of the indoor expansion valve 52a depends on the refrigerant outlet (gas gas) of the indoor heat exchanger 51a.
  • the refrigerant superheat degree at the pipe connecting portion 54a side) is adjusted to be the target refrigerant superheat degree.
  • the opening of the indoor expansion valve 52a is the refrigerant outlet (liquid pipe connection portion) of the indoor heat exchanger 51a. 53a side) is adjusted so that the refrigerant subcooling degree becomes the target refrigerant subcooling degree.
  • the target refrigerant superheat degree and the target refrigerant subcool degree are the refrigerant superheat degree and the refrigerant subcool degree necessary for exhibiting sufficient cooling capacity or heating capacity in the indoor unit 5a.
  • the indoor fan 55a is formed of a resin material and is disposed in the vicinity of the indoor heat exchanger 51a.
  • the indoor fan 55a is rotated by a fan motor (not shown) to take indoor air from the suction port (not shown) into the indoor unit 5a, and the indoor air exchanged with the refrigerant in the indoor heat exchanger 51a from the blower outlet (not shown). Release into the room.
  • the indoor unit 5a is provided with various sensors. Between the indoor heat exchanger 51a and the indoor expansion valve 52a in the indoor unit liquid pipe 71a, a liquid side temperature sensor 61a that detects the temperature of the refrigerant flowing into or out of the indoor heat exchanger 51a. Is provided.
  • the indoor unit gas pipe 72a is provided with a gas side temperature sensor 62a that detects the temperature of the refrigerant flowing out of the indoor heat exchanger 51a or flowing into the indoor heat exchanger 51a.
  • the indoor unit 5a is provided with an indoor unit control means 500a.
  • the indoor unit control means 500a is mounted on a control board stored in an electrical component box (not shown) of the indoor unit 5a. As shown in FIG. 1B, the CPU 510a, the storage unit 520a, the communication unit 530a, and the sensor input Part 540a.
  • the storage unit 520a is configured by a ROM or a RAM, and stores a detection value corresponding to a control program of the indoor unit 5a and detection signals from various sensors, setting information related to an air conditioning operation by the user, and the like.
  • the communication unit 530a is an interface that communicates with the outdoor unit 2 and the other indoor units 5b and 5c.
  • the sensor input unit 540a captures detection results from various sensors of the indoor unit 5a and outputs them to the CPU 510a.
  • the CPU 510a takes in the detection result of each sensor of the indoor unit 5a described above via the sensor input unit 540a. Further, the CPU 510a takes in a signal including operation information set by operating a remote controller (not shown), a timer operation setting, and the like via a remote control light receiving unit (not shown). Further, the CPU 510a transmits a control signal including an operation start / stop signal and operation information (required capacity, set temperature, indoor temperature, etc.) to the outdoor unit 2 via the communication unit 530a and the electric wiring 10, and the outdoor unit A control signal including information such as discharge pressure detected by the machine 2 is received from the outdoor unit 2 via the communication unit 530 a and the electrical wiring 10. The CPU 510a performs the opening degree adjustment of the indoor expansion valve 52a and the drive control of the indoor fan 55a based on the acquired detection result and the signal transmitted from the remote controller and the outdoor unit 2.
  • the outdoor unit control means 200 and the indoor unit control means 500a to 500t described above constitute the control means of the present invention.
  • the air conditioning apparatus 1 described above is installed in a room 300 shown in FIG.
  • the outdoor unit 2 is disposed outside the room 300, and 20 indoor units 5 a to 5 t are installed in the room 300.
  • One wall surface of the room 300 is provided with a window 310 arranged in the left-right direction.
  • the entrance / exit 320 is provided in a part of wall surface facing the wall surface in which the window 310 of the room 300 is provided.
  • Twenty indoor units 5a to 5t are arranged side by side at approximately equal intervals in the left-right direction of the room 300, and five are arranged at substantially equal intervals in the direction from the window 310 to the entrance / exit 320. That is, in the room 300, the indoor units 5a to 5t are arranged such that four rows of indoor units arranged in the left-right direction are arranged in five rows in the direction from the window 310 to the entrance / exit 320.
  • the row composed of the indoor units 5a to 5d is hereinafter referred to as A group.
  • a group the row on the entrance / exit 320 side of the A group.
  • B group the row composed of the indoor units 5e to 5h.
  • a row in which four indoor units 5i to 5l are arranged a row in which four indoor units 5m to 5p are arranged, and four indoor units 5q to 5t.
  • FIG. 1A shows the refrigerant flow and the operation of each part in the refrigerant circuit 100 during the air-conditioning operation of the air-conditioning apparatus 1 in the present embodiment.
  • the air conditioner 1 performs the cooling operation and the case where all the indoor units 5a to 5t are operated will be described, and the detailed description will be omitted when the heating operation is performed.
  • the arrow in FIG. 1A shows the flow of the refrigerant during the cooling operation.
  • the CPU 210 of the outdoor unit control means 200 is in a state where the four-way valve 22 is indicated by a solid line, that is, the port a and the port b of the four-way valve 22 communicate with each other.
  • the switching is performed so that the port c and the port d communicate with each other.
  • the refrigerant circuit 100 becomes a cooling cycle in which the outdoor heat exchanger 23 functions as a condenser and the indoor heat exchangers 51a to 51t function as evaporators.
  • the high-pressure refrigerant discharged from the compressor 21 flows through the discharge pipe 41 and flows into the four-way valve 22, and flows from the four-way valve 22 through the refrigerant pipe 43 and flows into the outdoor heat exchanger 23.
  • the refrigerant flowing into the outdoor heat exchanger 23 is condensed by exchanging heat with the outside air taken into the outdoor unit 2 by the rotation of the outdoor fan 27.
  • the refrigerant that has flowed out of the outdoor heat exchanger 23 into the outdoor unit liquid pipe 44 is decompressed by the outdoor expansion valve 24, and flows out to the liquid pipe 8 through the closing valve 25.
  • the refrigerant flowing through the liquid pipe 8 flows into the indoor units 5a to 5t via the liquid pipe connection portions 53a to 53t.
  • the refrigerant flowing into the indoor units 5a to 5t flows through the indoor unit liquid pipes 71a to 71t, passes through the indoor expansion valves 52a to 52t, and is decompressed.
  • the decompressed refrigerant flows into the indoor heat exchangers 51a to 51t, and evaporates by exchanging heat with the indoor air taken into the indoor units 5a to 5t by the rotation of the indoor fans 55a to 55t.
  • the indoor heat exchangers 51a to 51t function as evaporators, and the indoor air that has exchanged heat with the refrigerant in the indoor heat exchangers 51a to 51t is blown into the room from a blower outlet (not shown), thereby The room where the machines 5a to 5t are installed is cooled.
  • the refrigerant that has flowed out of the indoor heat exchangers 51a to 51t flows through the indoor unit gas pipes 72a to 72t, and flows out to the gas pipe 9 through the gas pipe connection portions 54a to 54t.
  • the refrigerant flowing through the gas pipe 9 and flowing into the outdoor unit 2 through the closing valve 26 flows in the order of the outdoor unit gas pipe 45, the four-way valve 22, the refrigerant pipe 46, the accumulator 28, and the suction pipe 42, and is sucked into the compressor 21. And compressed again.
  • the CPU 210 When the air conditioner 1 performs the heating operation, the CPU 210 is in a state where the four-way valve 22 is indicated by a broken line, that is, the port a and the port d of the four-way valve 22 communicate with each other, and the port b and the port c communicate with each other. Switch to Thereby, the refrigerant circuit 100 becomes a heating cycle in which the outdoor heat exchanger 23 functions as an evaporator and the indoor heat exchangers 51a to 51t of the indoor units 5a to 5t function as condensers.
  • the CPUs 510a to 510t of the indoor unit control means 500a to 500t are set temperature and suction temperature sensor 63a determined by the user.
  • the temperature difference between the indoor temperatures detected through the sensor input units 540a to 540t and calculated through the sensor input units 540a to 540t is calculated, and the required capacity of each indoor unit 5a to 5t based on the temperature difference is calculated via the communication units 530a to 530t. 2 to send.
  • the CPU 210 of the outdoor unit control means 200 that has received the required capacity of each indoor unit 5a to 5t via the communication unit 230 calculates the total required capacity that is the sum of the required capacity of each indoor unit 5a to 5t, The number of revolutions of the compressor 21 for circulating the amount of refrigerant necessary to achieve the calculated total required capacity to the refrigerant circuit 100 is determined. Then, the CPU 210 drives and controls the compressor 21 at the determined rotational speed.
  • the air conditioner 1 of the present embodiment was originally configured by connecting the old outdoor unit corresponding to the nonflammable refrigerant and the 20 old indoor units by the liquid pipe 8 and the gas pipe 9. Therefore, the outdoor unit 2 and 20 indoor units 5a to 5t corresponding to the flammable refrigerant and having the same capacity as the old outdoor unit and the old indoor unit are replaced by the liquid pipe 8 and the gas pipe 9 and the outdoor unit.
  • the refrigerant circuit 100 connecting the unit 2 and the 20 indoor units 5a to 5t is filled with a combustible refrigerant.
  • the old refrigerant is used for the filling amount. May be less. This is because the permissible filling amount (hereinafter referred to as the maximum filling amount) of the flammable refrigerant and the slightly flammable refrigerant is smaller than that of the non-flammable refrigerant in the standards such as IEC 60335-2-40 and ISO5149.
  • This maximum filling amount is determined as an allowable filling amount regardless of the size of the room, for example, in ISO 5149, if provision is made for management of refrigerant concentration in a room such as a ventilation fan or a gas leak sensor.
  • the non-flammable refrigerant is 150 kg regardless of the type of refrigerant, whereas in the case of flammable refrigerant and slightly flammable refrigerant, the amount is determined according to the minimum ignition concentration of each refrigerant. Is about 60 kg.
  • each indoor unit is requested even if the maximum capacity of each indoor unit is required in each indoor unit. If the refrigerant charge amount that can demonstrate the maximum capacity required in step 1 is replaced with a flammable refrigerant or a slightly flammable refrigerant by replacement, it will be charged compared to the old refrigerant even if it is filled to the regulated charge amount There is a risk that the capacity will be reduced and the maximum capacity of each indoor unit cannot be demonstrated.
  • threshold requirement ability for example 80
  • the air conditioner 1 in which the nonflammable refrigerant is replaced with the flammable refrigerant as described above, when the total required capacity of the indoor units 5a to 5t exceeds the threshold required capacity, the total value of the maximum capacity of each indoor unit
  • the threshold required capacity By calculating the ratio of the threshold required capacity to the number of indoor units in operation and stopping some of the indoor units so that the number of indoor units in operation is equal to or less than that ratio, the indoor units that are in operation will have their maximum capacity exhibited. It is possible. For example, in the air conditioner 1 of the present embodiment, when the maximum required capacity is required for all the indoor units 5a to 5t when the threshold required capacity is 80% of the total value of the maximum capacity of each indoor unit. Any one of the 20 indoor units 5a to 5t may be stopped.
  • the air conditioning space that the stopped indoor unit is responsible for that is, the stop in the room 300 is stopped.
  • the indoor temperature below the indoor unit rises or falls, and the temperature difference from the set temperature becomes larger than the air-conditioned space that is operated by the indoor unit that is operating. As a result, there is a risk of discomfort for the user existing in the air-conditioned space.
  • the air conditioner 1 of the present embodiment when the total required capacity of each indoor unit 5a to 5t exceeds the threshold required capacity, 16 units corresponding to the threshold required capacity among the indoor units 5a to 5t. The remaining four indoor units are stopped. And stop indoor unit rotation control which changes four indoor units to stop regularly is performed. Of the indoor units 5a to 5t, the number corresponding to the threshold required capacity indicates the number of indoor units that can exhibit the maximum capacity when the regulated charging amount of refrigerant is filled.
  • the CPU 210 of the outdoor unit control means 200 determines the indoor units 5q to 5t selected by the flowchart described later when the sum of the required capacities fetched from the indoor units 5a to 5t exceeds the threshold required capacity. Stop for a time (eg, 20 minutes).
  • the predetermined time is determined in advance by performing a test or the like, and the indoor units 5a to 5t are installed in a room having general heat insulation performance under a predetermined outside air temperature. This is the time when it has been confirmed that the air-conditioning environment of the air-conditioned space that the indoor unit is responsible for does not deteriorate extremely (for example, the temperature difference between the set temperature and the room temperature is 6 ° C. or more) even if the unit stops.
  • thermo-on time in the latest section (2) thermo-on time in the latest section, (3) magnitude of change in room temperature during operation in the latest section, (4) The priority order is determined based on the four items of the small amount of change in the room temperature during the stop of the latest section.
  • the stop indoor unit selection table 400 shown in FIG. 3 is stored in the storage unit 220 held by the outdoor unit control means 200 of the outdoor unit 2, and the indoor units 5a to 5t (all have the same maximum capacity). ) Is set by the user during cooling operation, the indoor temperature detected by each of the suction temperature sensors 63a to 63t and transmitted to the outdoor unit 2, and the set temperature is subtracted from the indoor temperature. The temperature difference ⁇ T and the order based on the temperature difference ⁇ T are stored for each of the indoor units 5a to 5t.
  • the stop indoor unit selection table 400 is received by the outdoor unit 2 every time the set temperature of the indoor units 5a to 5t is changed by the user or periodically (for example, every 30 seconds). Each time you do it, its contents are updated.
  • the stop indoor unit selection table when the indoor units 5a to 5t are performing the heating operation separately from the one shown in FIG.
  • the order is such that the temperature difference ⁇ T is small, that is, the order where the difference between the set temperature and the room temperature is small is given a high order, and the order is lowered as the temperature difference ⁇ T increases.
  • the CPU 210 refers to the stop indoor unit selection table 400 every predetermined time (for example, 20 minutes), and the predetermined number in order from the highest ranking. The indoor unit is selected and the indoor unit is stopped.
  • the CPU 210 refers to the stopped indoor unit selection table 400 that is updated at any given time every predetermined time, and starts from the highest rank among the 20 indoor units 5 a to 5 t. What is necessary is just to select four indoor units in order and to stop the said indoor unit.
  • the highest rank (ranked first) is the indoor unit 5r, indoor unit 5s, and indoor unit having a temperature difference ⁇ T of 0 ° C.
  • the CPU 210 refers to the stop indoor unit selection table 400 when executing the stop indoor unit rotation control when the required capacity of all the indoor units 5a to 5t exceeds the threshold required capacity during the cooling operation.
  • a total of three units of the three indoor units 5r, indoor units 5s, and indoor units 5t having higher ranks are stopped for a predetermined time.
  • the number of stop units necessary for exhibiting the total required capacity is four, but the indoor unit having the highest rank (temperature difference ⁇ T is 0 ° C.).
  • the stop indoor unit selection table 400 is referred to determine how many indoor units have the next highest rank. If there is exactly one indoor unit with the next highest rank, the CPU 210 also stops the indoor unit for a predetermined time. Then, after a predetermined time has elapsed, the updated indoor indoor unit selection table 400 is referred to again, and the four indoor units having the highest priority are selected and the indoor units are stopped.
  • the next highest rank is the temperature difference ⁇ T of +1 for the three indoor units 5r, the indoor unit 5s, and the indoor unit 5t having the highest rank.
  • the CPU 210 stops the indoor unit 5q for a predetermined time.
  • the indoor unit having a short thermo-on time in the latest section for example, 30 minutes is preferentially stopped for a predetermined time.
  • the short thermo-on time can be estimated to be a relatively low-load operation for maintaining the room temperature near the set temperature after the room temperature around the indoor unit reaches the set temperature. Since the operation is performed at a relatively low load, even if the indoor unit is stopped, the influence on the user's comfort is relatively small.
  • the next highest rank is the temperature difference ⁇ T of +1 for the three indoor units 5r, the indoor unit 5s, and the indoor unit 5t having the highest rank.
  • the CPU 210 stops the indoor unit 5q for a predetermined time.
  • the temperature change amount per unit time during operation that is, per unit time when the suction temperature is changing toward the set temperature.
  • the indoor unit with a large temperature change amount is preferentially stopped for a predetermined time.
  • the fact that the amount of temperature change per unit time when the suction temperature changes toward the set temperature is large can be estimated that the cooling capacity exhibited by the indoor unit with respect to the heat load is relatively large. In other words, it can be said that the heat load is small with respect to the cooling capacity exhibited by the indoor unit. In other words, since the cooling capacity exhibited by the indoor unit has a margin (large) with respect to the cooling capacity required for the room temperature to reach the set temperature, the comfort of the user even if the indoor unit is stopped. The effect on sex is relatively small.
  • the number of indoor units B estimated to have a relatively small thermal load was determined, and based on this, the temperature difference ⁇ T was further ranked among the indoor units of the same rank. If it does not exist, or if the indoor unit A and the indoor unit B alone are less than the specified number of stops, the amount of change in room temperature during a period of time longer than the most recent period (for example, 1 hour) is small.
  • the priority order of the indoor units to be stopped is determined based on the priority.
  • the next highest rank is the temperature difference ⁇ T of +1 for the three indoor units 5r, the indoor unit 5s, and the indoor unit 5t having the highest rank.
  • the amount of temperature change per unit time during operation stop that is, when the suction temperature changes in a direction away from the set temperature
  • the indoor unit having a small temperature change amount per unit time is preferentially stopped for a predetermined time.
  • the temperature change amount per unit time when the suction temperature is changing in the direction away from the set temperature is small, it can be estimated that the heat load is relatively small. That is, since the operation is relatively low load, even if the indoor unit is stopped, the influence on the user's comfort is relatively small.
  • the ability to operate all the indoor units 5a to 5t and exhibit them in each of the indoor units 5a to 5t, instead of providing a stop indoor unit Can be constrained to a value obtained by dividing the threshold required capacity by the number of indoor units 5a to 5t (20 in this embodiment), that is, a capacity lower than the maximum capacity.
  • a capacity lower than the maximum capacity if the capability exhibited by all the indoor units 5a to 5t is suppressed to a capability lower than the maximum capability in this way, there is a risk of discomfort to the user who requests the maximum capability.
  • the threshold required capacity for the total value of the maximum capacity of each indoor unit rather than operating all the indoor units 5a to 5t. It is possible to increase the combined value of the capabilities exhibited by the indoor units 5a to 5t by calculating a ratio of the above and stopping some of the indoor units so that the number of indoor units in operation is equal to or less than the ratio. .
  • the air conditioner 1 of the present embodiment stops the number of indoor units corresponding to the threshold required capacity when the total required capacity of all the indoor units 5a to 5t exceeds the threshold required capacity. At the same time, stop indoor unit rotation control is performed in which the stopped indoor units are changed every predetermined time. For this reason, even if the refrigerant
  • the air conditioner 1 of the present embodiment uses the indoor unit selected using the stop indoor unit selection table 400 when the required capacity of all the indoor units 5a to 5t exceeds the threshold required capacity. Stop indoor unit rotation control is performed to select the indoor unit to be stopped and stop again every predetermined time. Thereby, even if the refrigerant
  • FIG. 4 to FIG. 7 show the flow of processing when the CPU 210 performs the rotation operation, ST represents a step, and the subsequent number represents a step number.
  • the processing related to the present invention is mainly described.
  • Other processing for example, air flow such as control of the refrigerant circuit 100 corresponding to the operating conditions such as the set temperature and the air volume instructed by the user.
  • Description of general processing related to the harmony device 1 is omitted.
  • the CPU 210 of the outdoor unit control means 200 determines that the difference between the total required capability and the threshold required capability of the indoor units 5a to 5t is the sum of the required capabilities fetched from the indoor units 5a to 5t. Based on this, the specified number of stops, which is the number of stops of the indoor units during the rotation operation, is calculated (ST101). For example, in the air conditioner 1 of the present embodiment, when the threshold required capacity is 80% of the total required capacity when the maximum capacity is required for all the indoor units 5a to 5t, all the indoor units 5a When the maximum capacity is requested at ⁇ 5t, the specified number of stops is 4.
  • the CPU 210 sets the counter n to 1 (ST102), and then calculates the temperature difference ⁇ T between the indoor units 5a to 5t (ST103).
  • the temperature difference ⁇ T is a value obtained by subtracting a set temperature determined by the user from the room temperature detected by each of the suction temperature sensors 63a to 63t and transmitted to the outdoor unit 2. The larger the temperature difference ⁇ T, the higher the indoor unit is.
  • the CPU 210 determines whether or not the number of indoor units with the nth smallest temperature difference ⁇ T is equal to or less than the remaining specified stop number (ST104).
  • the counter n is 1, and in this case, the CPU 210 compares the number of indoor units with the smallest temperature difference ⁇ T with the specified number of stops.
  • the CPU 210 stops all the indoor units with the nth smallest temperature difference ⁇ T (ST105). It is determined whether or not the number of indoor units is equal to the specified stop number (ST106).
  • the CPU 210 ends the processing according to this flowchart. Thereafter, when a predetermined time (for example, 20 minutes) elapses, the CPU 210 performs the process of the flowchart again and selects an indoor unit to be stopped. If the number of stopped indoor units is not equal to the specified number of stopped units, that is, if the number of stopped indoor units is less than the specified number of stopped units (ST106-NO), the CPU 210 adds 1 to the counter n.
  • ST107 the process is returned to ST104.
  • the “remaining specified stop number” obtained by subtracting the number of indoor units stopped in ST105 to the specified stop number is compared with “the number of indoor units having the nth smallest temperature difference ⁇ T”.
  • the CPU 210 determines that the temperature difference ⁇ T is nth.
  • the number of indoor units A in which the thermo-off occurred in the latest section is extracted (ST201). Thereafter, it is determined whether or not the number of indoor units A is equal to or less than the remaining specified stop number (ST202). If the number of indoor units A is equal to or less than the remaining specified stop number (ST202-YES), the indoor units corresponding to the remaining specified stop number are stopped in order from the indoor unit with the short thermo-on time (ST203).
  • the CPU 210 If the number of indoor units A is not less than the remaining specified stop number (ST202-NO), the CPU 210 first stops all indoor units A (ST204). The number of indoor units that have been stopped so far has not reached the specified number of stops. Therefore, the CPU 210 moves the process to ST301, and among the indoor units having the nth smallest temperature difference ⁇ T, the indoor unit B that always has the temperature difference ⁇ T ⁇ 0 in the section longer than the latest section (for example, 1 hour). The number is extracted (ST301).
  • the number of indoor units B is equal to or less than the remaining specified stop number (ST302).
  • the amount of temperature change per unit time during operation that is, per unit time when the suction temperature is changing toward the set temperature
  • the indoor units for the remaining specified number of stops are stopped in order from the indoor unit having the largest temperature change amount (ST303). This is because the larger the amount of temperature change per unit time during operation of the indoor unit (that is, the amount of temperature change per unit time when the suction temperature is changing toward the set temperature), the smaller the heat load. This is because it can be estimated.
  • the CPU 210 ends the process according to this flowchart.
  • the CPU 210 If the number of indoor units B is not less than the remaining specified stop number (ST302-NO), the CPU 210 first stops all the indoor units B (ST304). The number of indoor units that have been stopped so far has not reached the specified number of stops. Therefore, the CPU 210 moves the process to ST401, and the temperature change amount per unit time during operation stop (that is, the temperature change amount per unit time when the suction temperature changes in a direction away from the set temperature) is small. The remaining number of indoor units is stopped in order from the indoor unit. This is because the smaller the amount of temperature change per unit time during shutdown of the indoor unit (that is, the amount of temperature change per unit time when the suction temperature changes in the direction away from the set temperature), the smaller the thermal load. This is because it can be estimated to be small.
  • the CPU 210 ends the process according to this flowchart.
  • the indoor units that are stopped when the stop indoor unit rotation control of the present embodiment is performed are selected in the stop indoor unit selection table 400, that is, the rank is high, that is, the temperature difference between the room temperature and the set temperature is small. Therefore, even if the indoor temperature rises or falls while the indoor unit is stopped, the temperature difference between the set temperature and the indoor temperature becomes smaller than when the other indoor units are stopped. There is little uncomfortable feeling of the user who exists in the air-conditioned space.
  • the 20 indoor units 5a to 5t can exhibit the same maximum capacity, and the ratio of the threshold required capacity to the total value of the maximum capacity of the indoor units 5a to 5t is the total number of stopped indoor units.
  • the threshold required capacity is 80% of the total capacity of indoor units 5a to 5t
  • the number of indoor units to be stopped is 80% of the total number (20 units). The case of using four units has been described.
  • the air conditioner is composed of multiple types of indoor units with different capacities, calculate the ratio of the threshold required capacity to the sum of the maximum capacity of each indoor unit, and An indoor unit to be stopped may be determined by combining a plurality of indoor units having different maximum capacities so that the total value of the number is equal to or less than the ratio.

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

Abstract

Selon la présente invention, lorsqu'une capacité de demande totale, c'est-à-dire le total des capacités de demande des équipements intérieurs (5a-5t), dépasse une capacité de demande seuil, une unité centrale de traitement (CPU) (210) fait fonctionner le nombre d'équipements intérieurs correspondant à la capacité de demande seuil et arrête les équipements intérieurs restants, effectuant ainsi une commande de rotation des équipements intérieurs arrêtés permettant de faire varier régulièrement les équipements intérieurs qui sont arrêtés. Lors de la réalisation de la commande de rotation des équipements intérieurs arrêtés, la CPU (210) calcule la charge thermique de chaque équipement intérieur à un intervalle de temps prescrit et arrête les équipements intérieurs ayant été sélectionnés dans l'ordre de la charge thermique la plus faible.
PCT/JP2019/005705 2018-03-29 2019-02-15 Dispositif de climatisation Ceased WO2019187760A1 (fr)

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JP7375490B2 (ja) * 2019-11-21 2023-11-08 株式会社富士通ゼネラル 空気調和装置

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JP2002106917A (ja) * 2000-09-28 2002-04-10 Hitachi Ltd 寒冷地用蓄熱式ヒートポンプ空気調和機
JP2004309015A (ja) * 2003-04-07 2004-11-04 Toho Gas Co Ltd Ｇｈｐ故障予知診断方法およびその装置
JP2012007887A (ja) * 2011-10-11 2012-01-12 Daikin Industries Ltd 空気調和システム及び空調管理装置
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JPH0960943A (ja) * 1995-08-28 1997-03-04 Toshiba Corp 空気調和装置
JP2002106917A (ja) * 2000-09-28 2002-04-10 Hitachi Ltd 寒冷地用蓄熱式ヒートポンプ空気調和機
JP2004309015A (ja) * 2003-04-07 2004-11-04 Toho Gas Co Ltd Ｇｈｐ故障予知診断方法およびその装置
JP2012007887A (ja) * 2011-10-11 2012-01-12 Daikin Industries Ltd 空気調和システム及び空調管理装置
JP2018013307A (ja) * 2016-07-22 2018-01-25 株式会社富士通ゼネラル 空気調和装置

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Publication number Priority date Publication date Assignee Title
JP2021156557A (ja) * 2020-03-30 2021-10-07 株式会社富士通ゼネラル 空気調和装置および空気調和方法
JP7347295B2 (ja) 2020-03-30 2023-09-20 株式会社富士通ゼネラル 空気調和装置および空気調和方法

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