WO2021214930A1 - 空気調和システムおよび制御方法 - Google Patents

空気調和システムおよび制御方法 Download PDF

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Publication number
WO2021214930A1
WO2021214930A1 PCT/JP2020/017448 JP2020017448W WO2021214930A1 WO 2021214930 A1 WO2021214930 A1 WO 2021214930A1 JP 2020017448 W JP2020017448 W JP 2020017448W WO 2021214930 A1 WO2021214930 A1 WO 2021214930A1
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WO
WIPO (PCT)
Prior art keywords
temperature
humidity
indoor
heat exchanger
opening degree
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/017448
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English (en)
French (fr)
Japanese (ja)
Inventor
太樹 飯塚
浦田　和幹
山田　邦之
悟 中安
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Johnson Controls Air Conditioning Inc
Original Assignee
Hitachi Johnson Controls Air Conditioning Inc
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 Hitachi Johnson Controls Air Conditioning Inc filed Critical Hitachi Johnson Controls Air Conditioning Inc
Priority to PCT/JP2020/017448 priority Critical patent/WO2021214930A1/ja
Priority to JP2022516569A priority patent/JPWO2021214930A1/ja
Priority to CN202080099724.XA priority patent/CN115398158A/zh
Publication of WO2021214930A1 publication Critical patent/WO2021214930A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to an air conditioning system and a method of controlling the operation of the air conditioning system.
  • the air conditioning system includes a system equipped with a dehumidifying (dry) mode in addition to the cooling mode.
  • dry mode operation generally, a method of reducing the amount of air blown to the heat exchanger (evaporator), setting the upper limit temperature of the evaporator low, and improving the latent heat capacity is widely adopted.
  • Patent Document 1 describes a method of setting the upper limit temperature of the evaporator low according to the detected value of the relative humidity sensor.
  • the surface temperature of the evaporator is the dew point of the sucked air while the humidity detected by the temperature / humidity sensor is higher than a predetermined value for the purpose of performing the cooling operation and enabling dehumidification.
  • Described is a device that calculates the suction pressure so that the temperature becomes lower and adjusts the opening degree of the electronic expansion valve so that the suction pressure becomes the calculated suction pressure.
  • the present invention is an air conditioning system including an indoor unit and an outdoor unit in view of the above problems.
  • the indoor unit Indoor heat exchanger and A temperature detecting means for detecting the temperature in the room and Includes humidity detection means to detect indoor humidity
  • the outdoor unit With an outdoor heat exchanger, Includes a compressor that circulates refrigerant to and from the indoor unit A valve provided between the outdoor heat exchanger and the indoor heat exchanger, A rotation speed control means that controls the rotation speed of the compressor according to the temperature detected by the temperature detection means, and
  • An air conditioning system is provided that includes an opening degree controlling means that controls the opening degree of the valve according to the humidity detected by the humidity detecting means.
  • the present invention it is possible to provide a system or method that can suppress a temperature drop during dehumidifying operation for each indoor unit and does not reduce the dehumidifying capacity even when the load is low.
  • FIG. 3 is a control block diagram illustrating a first control of a compressor frequency and an opening degree of an indoor expansion valve.
  • FIG. 3 is a control block diagram illustrating a second control of the frequency of the compressor and the opening degree of the indoor expansion valve.
  • FIG. 1 is a diagram showing a first configuration example of an air conditioning system.
  • the air conditioning system is a system that adjusts the temperature, humidity, etc. of the interior of a house or building, and includes an indoor unit 10 installed indoors and an outdoor unit 20 installed outdoors.
  • the indoor unit 10 and the outdoor unit 20 are connected by refrigerant pipes 30 and 31 through which a refrigerant as a heat medium circulates.
  • a refrigerant for example, hydrofluorocarbons such as R410a and R32 are used.
  • the indoor unit 10 and the outdoor unit 20 are connected by a communication cable or the like in order to communicate with each other.
  • the communication is not limited to wired communication using a communication cable, and may be wireless communication using WiFi (registered trademark) or the like.
  • the indoor unit 10 receives an operation of the remote controller by the user, receives an instruction to start or end the operation, changes the operation mode or the set temperature, and the like.
  • the indoor unit 10 commands the outdoor unit 20 to start the operation and starts the circulation of the refrigerant.
  • the indoor unit 10 also notifies the outdoor unit 20 of the received operation mode, set temperature, and the like.
  • the indoor unit 10 includes an indoor heat exchanger 11, a blower (fan) 12, a room temperature sensor 13 as a temperature detecting means for detecting an indoor temperature (room temperature), and a humidity as a humidity detecting means for detecting indoor humidity. Includes sensor 14. Further, the indoor unit 10 includes an indoor expansion valve 15 that expands the refrigerant flowing in the indoor heat exchanger 11 and adjusts the flow rate of the refrigerant.
  • the indoor unit 10 includes a control device (not shown) for controlling the fan 12 so as to have a set air volume, and notifying the outdoor unit 20 of a command for starting or ending operation and a detection result such as a room temperature sensor 13.
  • the indoor unit 10 receives a command to start operation, activates the fan 12, and takes in the indoor air by the fan 12.
  • the indoor heat exchanger 11 exchanges heat between the air taken in by the fan 12 and the refrigerant supplied from the outdoor unit 20, and blows out cooled air or warmed air.
  • the indoor unit 10 repeats this operation to cool or warm the room to a set temperature.
  • the control device acquires the room temperature detected by the room temperature sensor 13 and the humidity detected by the humidity sensor 14 as detected values, and notifies the outdoor unit 20.
  • the indoor expansion valve 15 changes the opening degree to expand the refrigerant flowing in the indoor heat exchanger 11 and adjust the flow rate of the refrigerant.
  • the indoor expansion valve 15 is provided on the inlet side of the refrigerant of the indoor heat exchanger 11 when used in the cooling mode.
  • the indoor expansion valve 15 may be provided at any position as long as it is on the inlet side of the refrigerant of the indoor heat exchanger 11 when used in the cooling mode and is inside the indoor unit 10.
  • the outdoor unit 20 is activated in response to a command from the indoor unit 10 and starts operation in the set operation mode or the operation mode notified by the indoor unit 10.
  • the operation mode is a cooling mode, a heating mode, a ventilation mode, or the like.
  • the outdoor unit 20 includes a compressor 21, an outdoor heat exchanger 22, and a control device 23.
  • the outdoor unit 20 further includes a fan (not shown), an outdoor expansion valve, and a four-way valve (not shown).
  • the control device 23 starts the compressor 21 and the fan, switches the four-way valve according to the operation mode, and starts controlling the compressor 21, the fan, the outdoor expansion valve, and the indoor expansion valve 15.
  • the compressor 21 circulates the refrigerant between the indoor unit 10 and the outdoor unit 20 via the refrigerant pipes 30 and 31.
  • the outdoor heat exchanger 22 exchanges heat between the outside air taken in by the fan and the refrigerant discharged from the compressor 21 or returned from the indoor unit 10.
  • the outdoor expansion valve expands the refrigerant condensed by the outdoor heat exchanger 22 or the indoor unit 10 and adjusts the flow rate of the refrigerant.
  • the control device 23 stops the compressor 21 and the fan, and stops the operation.
  • the high-temperature gaseous refrigerant discharged from the compressor 21 is supplied to the outdoor heat exchanger 22 that functions as a condenser via a four-way valve, condenses, and is condensed by the indoor expansion valve 15. It expands to form a two-phase flow in which gas and liquid are mixed, and after lowering the temperature, it is supplied to the indoor heat exchanger 11.
  • the refrigerant exchanges heat with the indoor air in the indoor heat exchanger 11 and evaporates, and the gaseous refrigerant discharged from the indoor unit 10 is returned to the compressor 21 via the four-way valve.
  • the indoor heat exchanger 11 that functions as a condenser exchanges heat between the refrigerant and the indoor air, condenses the refrigerant, and sends the refrigerant to the outdoor unit 20 via the indoor expansion valve 15.
  • the refrigerant is expanded by the outdoor expansion valve 24, evaporated by the outdoor heat exchanger 22 that functions as an evaporator, becomes a gaseous refrigerant, and is returned to the compressor 21 via the four-way valve 25.
  • the compressor 21, the outdoor expansion valve, and the indoor expansion valve 15 are controlled by the control device 23 included in the outdoor unit 20, but the present invention is not limited to this, and the control device included in the indoor unit 10 and the control device 10 are used. These controls may be performed by a centralized controller or the like provided separately.
  • FIG. 2 is a diagram showing an example of the hardware configuration of the control device 23 included in the outdoor unit 20.
  • the control device 23 includes a CPU 40, a flash memory 41, a RAM 42, a communication I / F 43, and a control I / F 44. Components such as the CPU 40 are connected to the bus 45, and information and the like are exchanged via the bus 45.
  • the flash memory 41 stores a program executed by the CPU 40, various data, and the like.
  • the RAM 42 provides a work area for the CPU 40.
  • the CPU 40 realizes the above control by reading and executing the program stored in the flash memory 41 into the RAM 42.
  • the communication I / F 43 is connected to the indoor unit 10 and receives information such as room temperature and humidity from the indoor unit 10.
  • the control I / F44 is connected to the compressor 21, the fan, the outdoor expansion valve, the four-way valve, and the indoor expansion valve 15 to control each device.
  • FIG. 3 is a control block diagram illustrating the first control of the frequency of the compressor 21 and the opening degree of the indoor expansion valve 15.
  • the control device 23 includes a rotation speed control means 32 that calculates the frequency of the AC power supply input to the compressor 21 based on the temperature difference between the set temperature and the value detected by the room temperature sensor 13 of the indoor unit 10.
  • the rotation speed control means 32 is realized by executing the program read from the flash memory 41 by the CPU 40 shown in FIG.
  • the above-mentioned rotation speed control means is realized by the CPU 40 executing a program, but the present invention is not limited to this, and may be realized by using hardware such as a circuit. This also applies to the following opening degree control means and the like.
  • the compressor 21 includes a motor, and an inverter is connected to the motor.
  • An inverter is a device that converts the voltage and frequency of a commercial power supply into a desired voltage and frequency and outputs them.
  • the rotation speed control means 32 inputs the calculated frequency to the inverter, and inputs the electric signal converted by the inverter to the frequency to the motor. As a result, the rotation speed control means 32 controls the rotation speed of the motor included in the compressor 21.
  • the frequency may be calculated by using a correspondence table in which the temperature difference is associated with the frequency, or by using an arithmetic expression in which the temperature difference is a variable.
  • the control device 23 holds the target humidity as well as the set temperature set by the user.
  • the target humidity is a target humidity set by the user.
  • the control device 23 includes an opening degree control means 33 that calculates the opening degree of the indoor expansion valve 15 based on the difference between the target humidity and the detection value of the humidity sensor 14 of the indoor unit 10.
  • the opening degree control means 33 inputs the calculated opening degree information as an electric signal to the indoor expansion valve 15, and controls the opening degree of the indoor expansion valve 15. Similar to the frequency calculation, the opening degree calculation may use a correspondence table in which the humidity difference and the opening degree are associated with each other, or an arithmetic expression in which the humidity difference is used as a variable may be used.
  • the motor and the indoor expansion valve 15 are actuators that convert the input electric signal into rotary motion or the like.
  • the motor rotates at a predetermined rotation speed, and the indoor expansion valve 15 adjusts to a predetermined opening degree.
  • the compressor 21 is a rotary compressor, a scroll compressor, or the like, and rotates the crankshaft by the rotation of the motor to compress the refrigerant taken into the cylinder.
  • the control device 23 reduces the frequency of the compressor 21 to reduce the circulation amount of the refrigerant. Take control.
  • the compressor 21 has a minimum operable rotation speed, and stops when the rotation speed falls below the minimum rotation speed (thermo-off).
  • the circulation of the refrigerant is also stopped, and in the case of the cooling operation, the temperature in the room rises. Then, the temperature difference between the room temperature and the set temperature becomes large, and the control device 23 starts the operation of the compressor 21 (thermoon). In this way, when the room temperature approaches the set temperature, the compressor 21 is operated near the minimum rotation speed, and intermittent operation in which thermo-on and thermo-off are repeated is performed.
  • the compressor 21 consumes a large amount of electric power at startup, when intermittent operation occurs, the power consumption increases as compared with continuous operation. Further, in the intermittent operation, the efficiency and reliability of the equipment are lowered as compared with the continuous operation, and the room temperature also fluctuates, so that the comfort is impaired. Therefore, if intermittent operation can be avoided, it is desirable to avoid intermittent operation.
  • the humidity in the room can be reduced by reducing the amount of air blown by the fan 12 to the room heat exchanger 11 and setting the evaporation temperature of the refrigerant flowing in the room heat exchanger 11 low. Specifically, when the air volume of the fan 12 is reduced, the evaporation temperature is lowered and the cooling capacity is not changed, so that the air temperature is lowered. When the temperature of the air falls below the dew point due to the decrease in the temperature of the air, the water vapor in the air condenses, so that the humidity in the room decreases.
  • the indoor expansion valve 15 is used to reduce the flow rate of the refrigerant flowing in the indoor heat exchanger 11. That is, the opening degree of the indoor expansion valve 15 is reduced to reduce the flow rate of the refrigerant.
  • the cooling capacity is reduced, so that the decrease in room temperature can be suppressed. Further, since the decrease in room temperature is suppressed, it is not necessary for the compressor 21 to reduce the circulation amount of the refrigerant, and even when the load is low, it is not necessary to reduce the rotation speed to a speed lower than the minimum rotation speed. It becomes possible to avoid it.
  • the mass flow rate decreases as the pressure on the outlet side of the expansion valve decreases, and the evaporation temperature of the refrigerant decreases.
  • the indoor heat exchanger 11 functions as an evaporator, and mainly cools the air by the heat of vaporization when the liquid component in the refrigerant evaporates.
  • the indoor heat exchanger 11 has a plurality of heat transfer tubes, and the effective area is defined by the ratio of the liquid component occupying the inside of the heat transfer tubes.
  • the opening degree of the indoor expansion valve 15 is reduced, the temperature of the refrigerant is lowered, so that the temperature of the air in contact with the heat transfer tube can be lowered. Therefore, more water vapor contained in the air in contact with the heat transfer tube is condensed, and as a result, the amount of water vapor contained in the air as a whole can be reduced and dehumidification can be performed.
  • FIG. 4 is a diagram showing the state of room temperature after the start of operation of the air conditioning system.
  • the solid line shows the result of this control
  • the broken line shows the result of the cooling operation
  • the alternate long and short dash line shows the operation result of the dry mode.
  • the target temperature which is the set temperature, is also shown.
  • the cooling operation quickly drops from the room temperature at the start of operation to the set temperature, but it takes a certain amount of time for the temperature to stabilize.
  • the room temperature has dropped beyond the set temperature.
  • the rate of decrease to the set temperature is slower than in the cooling operation, but the temperature stabilizes faster than in the cooling operation, and the temperature fluctuation after stabilization is small. Therefore, by adopting this control, the temperature can be stably adjusted.
  • FIG. 5 is a diagram showing the state of humidity in the room after the start of operation of the air conditioning system.
  • the solid line shows the result of this control
  • the broken line shows the result of the cooling operation
  • the alternate long and short dash line shows the operation result of the dry mode.
  • the target humidity is also shown in FIG.
  • Humidity is a relative humidity and is represented by the ratio of the partial pressure of water vapor contained in air at room temperature to the maximum partial pressure of water vapor that can be contained in air at room temperature.
  • the cooling operation is an operation that does not dehumidify
  • the indoor humidity has not dropped to the target humidity.
  • the humidity in the room reaches the target humidity quickly because the dehumidification is performed without reducing the flow rate of the refrigerant flowing in the indoor heat exchanger 11.
  • the flow rate of the refrigerant flowing in the indoor heat exchanger 11 is reduced by the indoor expansion valve 15 to perform dehumidification, so that it takes longer than the dry mode operation, but the indoor humidity is reduced to the target humidity. Can be maintained at the target humidity. Therefore, by adopting this control, it is possible to stably adjust the humidity.
  • FIG. 6 is a flowchart showing a first example of control of the indoor expansion valve 15.
  • the control device 23 starts controlling the compressor 21, the indoor expansion valve 15, and the like in response to the start of operation of the outdoor unit 20.
  • the control of the indoor expansion valve 15 is started from step 100, and in step 101, the detected value RH detected by the humidity sensor 14 is compared with the set target humidity RHo, and it is determined whether or not the RH is larger than the RHo. do.
  • step 101 If it is determined in step 101 that RH is larger than RHo, the process proceeds to step 102, and the indoor expansion valve 15 is instructed to reduce the opening degree. This is to reduce the humidity while suppressing the decrease in room temperature.
  • the indoor expansion valve 15 is provided with information on an opening degree smaller than the current opening degree, which is calculated based on the difference between the detected value of the humidity sensor 14 and the target humidity, as an electric signal. Then, the process returns to step 101 to continue the control.
  • step 101 If it is determined in step 101 that the RH is RHo or less, the process proceeds to step 103, and it is determined whether or not the RH is smaller than the RHo. If it is determined that the RH is smaller than the RHo, the process proceeds to step 104, and the indoor expansion valve 15 is instructed to increase the opening degree in order to suppress the decrease in humidity. In this case, information on an opening degree larger than the current opening degree obtained by calculation is given to the indoor expansion valve 15. Then, the process returns to step 101 to continue the control.
  • step 103 If it is determined in step 103 that RH is the same as RHo, the process proceeds to step 105, and since the indoor humidity is maintained at the target humidity, the indoor expansion valve 15 is instructed to maintain the opening degree. In this case, the information on the current opening degree may be given to the indoor expansion valve 15, or may not be given because the opening degree does not change. Then, the process returns to step 101 to continue the control. This control continues until the air conditioning system is shut down.
  • FIG. 7 is a diagram showing a second configuration example of the air conditioning system.
  • the indoor unit 10 is further provided with two pipe temperature sensors 16 and 17. Since the indoor heat exchanger 11 and fan 12 included in the indoor unit 10 and the compressor 21 and outdoor heat exchanger 22 included in the outdoor unit 20 have already been described, only the two piping temperature sensors 16 and 17 will be described here. do.
  • the two pipe temperature sensors 16 and 17 are attached adjacent to the outer wall surface of each of the two pipes connecting the indoor heat exchanger 11 and detect the temperature of the pipe outer wall surface.
  • the two pipe temperature sensors 16 and 17 are attached to the outer wall surface of each pipe near the two connecting portions connecting the indoor heat exchanger 11 and each of the two pipes.
  • the pipe temperature sensor 16 serves as a liquid pipe temperature sensor that detects the temperature of the outer wall surface of the pipe through which the two-phase refrigerant flowing through the indoor expansion valve 15 flows.
  • the pipe temperature sensor 17 functions as a gas pipe temperature sensor that detects the temperature of the outer wall surface of the pipe through which the gaseous refrigerant that evaporates by the indoor heat exchanger 11 flows and is discharged from the indoor heat exchanger 11.
  • the temperature of the two-phase flow refrigerant (saturation temperature or evaporation temperature of the refrigerant) can be obtained.
  • the pipe temperature sensor 17 that functions as the gas pipe temperature sensor From the detected value of the pipe temperature sensor 17 that functions as the gas pipe temperature sensor, the refrigerant evaporates, and the temperature of the further heated refrigerant gas can be obtained. The difference between the temperature of the obtained refrigerant gas and the saturation temperature of the obtained refrigerant is called the degree of superheat.
  • the control device 23 calculates the degree of superheat from the detected values of the pipe temperature sensors 16 and 17, orders the degree of superheat to increase or decrease, or orders the degree of superheat to be maintained, and opens the indoor expansion valve 15. To control. Specific control will be described with reference to FIG.
  • FIG. 8 is a flowchart showing a second example of control of the indoor expansion valve 15.
  • the control device 23 starts controlling the compressor 21, the indoor expansion valve 15, and the like in response to the start of operation of the outdoor unit 20.
  • the control of the indoor expansion valve 15 is started from step 200, and in step 201, the detected value RH detected by the humidity sensor 14 is compared with the target humidity RHo, and it is determined whether or not the RH is larger than the RHo.
  • step 201 If it is determined in step 201 that RH is larger than RHo, the process proceeds to step 202, and the indoor expansion valve 15 is instructed to increase the degree of superheat.
  • the degree of superheat can be increased by raising the temperature of the refrigerant gas exiting the indoor heat exchanger 11, lowering the saturation temperature (evaporation temperature) of the refrigerant, or both. In order to raise the temperature of the refrigerant gas, it is necessary to reduce the liquid component in the refrigerant, and in order to lower the evaporation temperature, it is necessary to lower the pressure of the refrigerant. These can be realized by reducing the opening degree of the indoor expansion valve 15. When RH is larger than RHo, it is necessary to reduce the opening degree of the indoor expansion valve 15 as explained with reference to FIG. 6, and instruct to increase the degree of superheat in order to control the opening degree to be small. do.
  • the control device 23 gives the indoor expansion valve 15 information on the degree of superheat that is larger than the current degree of superheat, which is calculated based on the detected values of the pipe temperature sensors 16 and 17, as an electric signal.
  • the indoor expansion valve 15 holds, for example, a table or the like in which the degree of superheat and the opening degree are associated with each other, obtains the opening degree using the table or the like, and adjusts to the opening degree. Then, the process returns to step 201 to continue the control.
  • step 201 If it is determined in step 201 that the RH is RHo or less, the process proceeds to step 203, and it is determined whether or not the RH is smaller than the RHo. If it is determined that the RH is smaller than the RHo, the process proceeds to step 204, and conversely, the indoor expansion valve 15 is instructed to reduce the degree of superheat in order to control the opening degree to be increased.
  • the control device 23 gives information on the superheat degree smaller than the calculated current superheat degree to the indoor expansion valve 15 as an electric signal. Then, the process returns to step 201 to continue the control.
  • step 203 If it is determined in step 203 that RH is the same as RHo, the process proceeds to step 205, and the indoor expansion valve 15 is instructed to maintain the current degree of superheat. This is because the current degree of superheat is maintained at the target humidity. In this case, the information on the current degree of superheat may or may not be given to the indoor expansion valve 15. Then, the process returns to step 201 to continue the control. This control also continues until the air conditioning system is shut down.
  • FIG. 9 is a diagram showing a third configuration example of the air conditioning system.
  • the configuration shown in FIG. 9 is a configuration in which the pipe temperature sensor 17 of the indoor unit 10 is eliminated from the configuration shown in FIG. That is, it is configured to include only the pipe temperature sensor 16 that functions as a liquid pipe temperature sensor when the indoor heat exchanger 11 is used as an evaporator.
  • the pipe temperature sensor 16 detects the temperature of the outer wall surface of the pipe through which the two-phase flow refrigerant flowing through the indoor expansion valve 15 flows, that is, the temperature of the liquid pipe. From the liquid pipe temperature, the evaporation temperature of the refrigerant can be obtained.
  • the control device 23 commands the liquid pipe temperature to increase or decrease, or to maintain the liquid pipe temperature, and controls the opening degree of the indoor expansion valve 15. Specific control will be described with reference to FIG.
  • FIG. 10 is a flowchart showing a third example of control of the indoor expansion valve 15.
  • the control shown in FIG. 10 is a control using the pipe temperature sensor 16 shown in FIG.
  • the control device 23 starts controlling the compressor 21, the indoor expansion valve 15, and the like in response to the start of operation of the outdoor unit 20.
  • the control of the indoor expansion valve 15 is started from step 300, and in step 301, the detected value RH detected by the humidity sensor 14 is compared with the target humidity RHo, and it is determined whether or not the RH is larger than the RHo.
  • step 301 If it is determined in step 301 that RH is larger than RHo, the process proceeds to step 302 and an instruction is given to lower the liquid pipe temperature.
  • the liquid pipe temperature is related to the evaporation temperature of the refrigerant and can be lowered by lowering the evaporation temperature.
  • the evaporation temperature can be lowered by lowering the pressure of the refrigerant, and can be realized by reducing the opening degree of the indoor expansion valve 15.
  • RH is larger than RHo, it is necessary to reduce the opening degree of the indoor expansion valve 15, and in order to control the opening degree to be small, the liquid pipe temperature is instructed to be lowered.
  • the control device 23 gives the indoor expansion valve 15 information on the liquid pipe temperature lower than the current liquid pipe temperature, which is calculated based on the detection value of the pipe temperature sensor 16, as an electric signal.
  • the indoor expansion valve 15 holds, for example, a table or the like in which the liquid pipe temperature and the opening degree are associated with each other, obtains the opening degree using the table or the like, and adjusts to the opening degree. Then, the process returns to step 301 to continue the control.
  • step 301 If it is determined in step 301 that the RH is RHo or less, the process proceeds to step 303, and it is determined whether or not the RH is smaller than the RHo. If it is determined that RH is smaller than RHo, the process proceeds to step 304, and conversely, an instruction is given to raise the liquid pipe temperature in order to control the opening degree to be increased.
  • the control device 23 gives information on the liquid pipe temperature higher than the calculated current liquid pipe temperature to the indoor expansion valve 15 as an electric signal. Then, the process returns to step 301 to continue the control.
  • step 303 If it is determined in step 303 that RH is the same as RHo, the process proceeds to step 305 and the current liquid tube temperature is maintained. This is because the current liquid tube temperature is maintained at the target humidity. In this case, the information on the current liquid pipe temperature may or may not be given to the indoor expansion valve 15. In this case as well, the process returns to step 301 to continue the control.
  • the indoor humidity can be adjusted to the target humidity by the control explained so far, but the target humidity is not limited to the one set by the user.
  • the target humidity may be calculated from the set temperature set by the user.
  • FIG. 11 is a control block diagram illustrating a second control of the frequency of the compressor 21 and the opening degree of the indoor expansion valve 15.
  • the optimum humidity is calculated from the set temperature set by the user, and the opening degree of the indoor expansion valve 15 is controlled so as to be the humidity.
  • the control of room temperature is the same as the example shown in FIG. That is, the frequency of the AC power source output by the inverter for driving the motor of the compressor 21 based on the temperature difference between the set temperature and the room temperature detected by the room temperature sensor 13 of the indoor unit 10 by the rotation speed control means 32. Is calculated. Then, the rotation speed control means 32 inputs the frequency obtained by calculation to the motor of the compressor 21.
  • the humidity calculation means 34 calculates the target humidity based on the comfort index.
  • the opening degree control means 33 calculates the opening degree of the indoor expansion valve 15 so as to reach the target humidity obtained by the calculation, and inputs the obtained opening degree information to the indoor expansion valve 15.
  • the comfort index is an index showing how comfortable a person is, and as a method for measuring the comfort, for example, the average expected warm / cold feeling report (PMV) can be used.
  • PMV is calculated from the six elements of temperature, humidity, radiation, airflow, activity amount, and clothing amount, and by setting the radiation, airflow, activity amount, and clothing amount to constant values, it becomes a function of temperature and humidity only. ..
  • the target humidity can be calculated as the optimum humidity.
  • PPD predicted discomfort rate
  • each indoor unit 10a to 10n is provided with an indoor expansion valve 15a to 15n, and by controlling each indoor expansion valve 15a to 15n, the cooling capacity of each indoor unit 10a to 10n can be individually increased. This is because it can be controlled. As a result, each room in which each indoor unit 10a to 10n is installed can be individually dehumidified while suppressing the cooling capacity, and cooling during dehumidification can be prevented. Further, since the compressor 21 does not easily reach the minimum rotation speed, dehumidification can be effectively performed even when the load is low.
  • the present invention is not limited to the above-described embodiments, and other embodiments, additions, modifications, and the like. It can be changed within the range that can be conceived by those skilled in the art, such as deletion, and is included in the scope of the present invention as long as the action and effect of the present invention are exhibited in any of the embodiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)
PCT/JP2020/017448 2020-04-23 2020-04-23 空気調和システムおよび制御方法 Ceased WO2021214930A1 (ja)

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CN115900007A (zh) * 2023-03-09 2023-04-04 浙江德塔森特数据技术有限公司 一种机架式空调的调温除湿方法及装置

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JP2002107001A (ja) * 2000-09-29 2002-04-10 Mitsubishi Electric Corp 空気調和機
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JP2002107001A (ja) * 2000-09-29 2002-04-10 Mitsubishi Electric Corp 空気調和機
JP2003254583A (ja) * 2002-02-28 2003-09-10 Toshiba Kyaria Kk 空気調和機
JP2006242403A (ja) * 2005-02-28 2006-09-14 Sanyo Electric Co Ltd 冷媒サイクル装置
WO2015166576A1 (ja) * 2014-05-01 2015-11-05 三菱電機株式会社 空気調和装置
JP2017089950A (ja) * 2015-11-06 2017-05-25 株式会社富士通ゼネラル 空気調和システム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220342466A1 (en) * 2020-07-08 2022-10-27 Nvidia Corporation Intelligent repurposable cooling systems for mobile datacenter
US11681341B2 (en) * 2020-07-08 2023-06-20 Nvidia Corporation Intelligent repurposable cooling systems for mobile datacenter
CN115900007A (zh) * 2023-03-09 2023-04-04 浙江德塔森特数据技术有限公司 一种机架式空调的调温除湿方法及装置

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