WO2023021574A1 - 空気調和装置 - Google Patents
空気調和装置 Download PDFInfo
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- WO2023021574A1 WO2023021574A1 PCT/JP2021/030009 JP2021030009W WO2023021574A1 WO 2023021574 A1 WO2023021574 A1 WO 2023021574A1 JP 2021030009 W JP2021030009 W JP 2021030009W WO 2023021574 A1 WO2023021574 A1 WO 2023021574A1
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- air
- control
- compressor
- room temperature
- low
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- 238000004378 air conditioning Methods 0.000 title abstract description 33
- 230000007423 decrease Effects 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 9
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 239000012530 fluid Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
-
- 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
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- 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 disclosure relates to an air conditioner that adjusts the temperature of a space such as a living space.
- a lower limit frequency is stipulated for the compressor frequency of air conditioners to ensure the reliability of the compressor.
- the load of the air conditioner is low, even if the compressor is driven at the lower limit frequency, the capacity of the air conditioner becomes large relative to the load, and start/stop operation in which the compressor is repeatedly started and stopped occurs. Since the room temperature fluctuates when the compressor starts and stops, comfort deteriorates. In addition, when the compressor is started, the state of the refrigerant is not stable, and the efficiency of the refrigeration cycle is lowered.
- Patent Document 1 overshoot is suppressed and controllability is improved by reducing the control width of the compressor frequency when the room temperature approaches the set temperature.
- controllability is improved by reducing the control width of the compressor frequency when the room temperature approaches the set temperature.
- such an effect of improving the controllability can be obtained only when the air conditioning capacity is stable and the compressor frequency is relatively high.
- the rate of change in the air conditioning capacity per 1 Hz of the compressor frequency is the same as the air conditioning capacity when the compressor frequency is relatively high and operating. greater than the rate of change. Therefore, in Patent Document 1, there is a problem that an overshoot may occur when the power is low and the controllability may deteriorate.
- Patent Document 2 when the compressor frequency is relatively low and the power is low, the controllability of the compressor frequency is reduced to improve the controllability when the power is low.
- the control of Patent Document 2 since the actual air conditioner is greatly affected by the shape of the indoor unit and the wind speed of the indoor unit, the control of Patent Document 2 does not always provide the intended controllability, and there is room for improvement. .
- the present disclosure is intended to solve the above-described problems, and aims to provide an air conditioner that achieves both improved controllability during low performance and reduced power consumption.
- An air conditioner is arranged in an air-conditioned space, includes an indoor unit having an indoor heat exchanger and an indoor fan that blows air to the indoor heat exchanger, an outdoor unit having a compressor, and a room temperature in the air-conditioned space.
- a control device that performs normal operation to control the compressor with the control width set to the first control width when the set frequency exceeds the set frequency, and the control device controls the compressor frequency to be equal to or lower than the set frequency, and the indoor fan
- the control width is set to a second control width that is smaller than the first control width, and a low-capacity operation is performed to control the compressor, and the compressor frequency is set to the set frequency.
- the air conditioner of the present disclosure when the compressor frequency is at a low capacity of the set frequency or less and the indoor fan rotation speed is at a set rotation speed or less and the air volume is low, the compression is higher than when the power is low. Perform low-air-flow, low-capacity operation that narrows the control range of the machine frequency. As a result, the air conditioner can achieve both improved controllability and reduced power consumption when the capacity is low.
- FIG. 1 is a schematic configuration diagram of an air conditioner according to Embodiment 1.
- FIG. 2 is a control block diagram of the air conditioner according to Embodiment 1.
- FIG. FIG. 4 is a diagram showing the operation of the air-conditioning apparatus according to Embodiment 1 during cooling operation;
- FIG. 4 is a wet air diagram showing changes in the state of air during cooling operation of the air conditioner according to Embodiment 1.
- FIG. 4 is a diagram showing the operation of the air-conditioning apparatus according to Embodiment 1 during heating operation;
- FIG. FIG. 4 is a diagram of a wet air diagram showing changes in the state of air during heating operation of the air conditioner according to Embodiment 1;
- FIG. 4 is an explanatory diagram of the effect of low-capacity operation in the air conditioner according to Embodiment 1;
- FIG. 4 is an explanatory diagram of a short cycle;
- FIG. 4 is an explanatory diagram of the effect of low air volume, low capacity operation in the air conditioner according to Embodiment 1;
- 4 is a flow chart showing transition from normal operation to low-capacity operation or low-airflow-low-capacity operation in the air conditioner according to Embodiment 1.
- FIG. FIG. 4 is a diagram showing the relationship between air conditioning capacity and equipment efficiency according to fan rotation speed.
- 2 is a diagram showing a schematic configuration of Modification 1 of the air conditioner according to Embodiment 1.
- FIG. FIG. 2 is a diagram showing a schematic configuration of Modification 2 of the air-conditioning apparatus according to Embodiment 1;
- FIG. 10 is an explanatory diagram of the effect of the low air volume, low capacity operation of the air conditioner according to Embodiment 2;
- FIG. 1 is a schematic configuration diagram of an air conditioner 100 according to Embodiment 1.
- the air conditioner 100 of Embodiment 1 includes an outdoor unit 1 arranged outside the air-conditioned space and an indoor unit 2 arranged inside the air-conditioned space.
- the outdoor unit 1 and the indoor unit 2 are connected by a pipe 36 .
- the outdoor unit 1 and the indoor unit 2 are connected by wiring (not shown) such as a power line or a signal line.
- the outdoor unit 1 includes a compressor 11 , a channel switching valve 12 , an outdoor heat exchanger 13 , an expansion valve 14 and an outdoor fan 15 .
- the indoor unit 2 includes an indoor heat exchanger 21, an indoor fan 22, a first temperature sensor 31, a second temperature sensor 32, a third temperature sensor 33, an intake temperature sensor 34 as a room temperature sensor, and an air outlet temperature sensor.
- a sensor 35 and a control device 5 are provided.
- the compressor 11, the flow path switching valve 12, the outdoor heat exchanger 13, the expansion valve 14, and the indoor heat exchanger 21 are connected by pipes 36 to form a refrigerant circuit.
- the refrigerant circulating in the refrigerant circuit of the air conditioner 100 is, for example, a natural refrigerant such as carbon dioxide, a hydrocarbon or helium, a chlorine-free refrigerant such as HFC410A or HFC407C, or a Freon-based refrigerant such as R22 or R134a.
- the compressor 11 is a fluid machine that sucks in low-pressure gas refrigerant, compresses it, and discharges it as high-pressure gas refrigerant.
- Various types of compressors such as reciprocating, rotary, scroll or screw compressors are used as the compressor 11 .
- the operating frequency of the compressor 11 is controlled by the controller 5 .
- the flow path switching valve 12 is a four-way valve that switches between cooling operation in which the outdoor heat exchanger 13 functions as a condenser and heating operation in which the outdoor heat exchanger 13 functions as an evaporator.
- cooling operation the flow path switching valve 12 is switched so that the refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 13 as indicated by the solid line in FIG.
- heating operation the flow path switching valve 12 is switched so that the refrigerant discharged from the compressor 11 flows into the indoor heat exchanger 21, as indicated by the dashed line in FIG.
- the outdoor heat exchanger 13 is, for example, a plate-fin tube type heat exchanger, and performs heat exchange between the refrigerant flowing inside the circular tube or flat tube and the air supplied by the outdoor fan 15 .
- the outdoor heat exchanger 13 is arranged between the flow path switching valve 12 and the expansion valve 14 .
- the outdoor heat exchanger 13 functions as an evaporator during heating operation, and functions as a condenser during cooling operation.
- the expansion valve 14 is a valve that reduces the pressure of the refrigerant.
- the expansion valve 14 is an electronic expansion valve whose opening degree can be adjusted by the control device 5 .
- the expansion valve 14 is arranged between the outdoor heat exchanger 13 and the indoor heat exchanger 21 .
- the expansion valve 14 is arranged in the outdoor unit 1 in FIG. 1 , it may be arranged in the indoor unit 2 .
- the outdoor fan 15 draws in air outside the air-conditioned space, passes it through the outdoor heat exchanger 13, and blows it out of the air-conditioned space.
- the outdoor fan 15 is, for example, a propeller fan, a sirocco fan, or a cross-flow fan driven by a motor.
- the air volume of the outdoor fan 15 is controlled by controlling the rotational speed of the outdoor fan 15 by the control device 5 .
- the control device 5 controls the air volume of the outdoor fan 15 by changing the current value to control the rotation speed.
- the control device 5 controls the air volume of the outdoor fan 15 by changing the power supply frequency through inverter control to control the rotation speed.
- the indoor heat exchanger 21 is, for example, a plate-fin tube type heat exchanger, and performs heat exchange between the refrigerant flowing inside the circular tube or flat tube and the air blown by the indoor fan 22 .
- the indoor heat exchanger 21 is arranged between the expansion valve 14 and the flow path switching valve 12 .
- the indoor heat exchanger 21 functions as a condenser during heating operation, and functions as an evaporator during cooling operation.
- the indoor fan 22 sucks in the air in the space to be air-conditioned and sends it to the indoor heat exchanger 21 .
- the air blown to the indoor heat exchanger 21 is blown into the air-conditioned space.
- the indoor fan 22 is, for example, a propeller fan, a sirocco fan, or a cross-flow fan driven by a motor.
- the air volume of the indoor fan 22 is controlled by controlling the rotational speed of the indoor fan 22 by the controller 5 .
- the control device 5 controls the air volume of the indoor fan 22 by changing the current value to control the rotation speed.
- the control apparatus 5 controls the air volume of the indoor fan 22 by changing the power supply frequency through inverter control to control the rotation speed.
- one indoor fan 22 is arranged upstream of the indoor heat exchanger 21 in the air flow indicated by the arrow in the figure. are not limited to the example in FIG.
- the indoor fan 22 may be arranged downstream of the indoor heat exchanger 21, or a plurality of indoor fans 22 may be arranged upstream and downstream of the indoor heat exchanger 21, respectively.
- the indoor unit 2 is an indoor unit that is attached to the wall or ceiling of the air-conditioned space.
- a housing 20 (see later-described FIG. 8) of the indoor unit 2 is provided with a suction port 20a and a discharge port 20b. Air in the air-conditioned space S (see FIG. 8, which will be described later) is sucked in by the indoor fan 22 from the suction port 20a, cooled or heated by the indoor heat exchanger 21, and blown out from the air outlet 20b into the air-conditioned space S. .
- the first temperature sensor 31 is provided in the pipe connecting the indoor heat exchanger 21 and the expansion valve 14, detects the temperature of the refrigerant on the inlet side of the indoor heat exchanger 21 during cooling operation, , the temperature of the refrigerant on the outlet side of the indoor heat exchanger 21 is detected.
- the second temperature sensor 32 is provided in a pipe connecting the indoor heat exchanger 21 and the flow path switching valve 12, and detects the temperature of the refrigerant on the outlet side of the indoor heat exchanger 21 during cooling operation.
- the third temperature sensor 33 is provided in the indoor heat exchanger 21 and detects the temperature of the refrigerant flowing through the indoor heat exchanger 21 . The refrigerant temperatures detected by the first temperature sensor 31 , the second temperature sensor 32 and the third temperature sensor 33 are transmitted to the control device 5 .
- the intake temperature sensor 34 is arranged around the intake port 20a and detects the temperature of the air drawn into the indoor unit 2 from the air-conditioned space S.
- the suction temperature detected by the suction temperature sensor 34 is transmitted to the control device 5 .
- the suction temperature is the temperature of the air-conditioned space S, that is, the room temperature. That is, the suction temperature sensor 34 detects the room temperature.
- the blowout temperature sensor 35 is provided around the blowout port 20b and detects the temperature of the air blown out from the indoor unit 2 into the air-conditioned space S. The blowing temperature detected by the blowing temperature sensor 35 is transmitted to the control device 5 .
- the control device 5 is composed of a microcomputer equipped with a CPU, ROM, RAM, and I/O ports.
- the control device 5 receives an instruction from a user input via a remote control or the like, and detection results of the first temperature sensor 31, the second temperature sensor 32, the third temperature sensor 33, the suction temperature sensor 34, and the blowing temperature sensor 35. and the operation of the entire air conditioner 100 is controlled based on.
- the control device 5 is provided in the indoor unit 2 in FIG. It is good also as a structure which carries out.
- FIG. 2 is a control block diagram of the air conditioner 100 according to Embodiment 1.
- the control device 5 of the air conditioner 100 has an operation control section 51, an air volume control section 52, and an air direction control section 53 as functional sections.
- Each functional unit is realized by executing a program by the control device 5, or realized by a dedicated processing circuit.
- the operation control unit 51 receives setting information input via a remote controller or the like, detection results of the first temperature sensor 31, the second temperature sensor 32, the third temperature sensor 33, the suction temperature sensor 34, and the blowing temperature sensor 35. Cooling operation and heating operation are executed based on
- the setting information to be input includes, for example, information as to whether cooling operation or heating operation is to be performed, air volume, set temperature, and the like. In the air volume setting, in addition to being able to set the air volume in stages, you can also set "automatic".
- the operation control unit 51 controls the compressor frequency, the switching of the flow path switching valve 12, the degree of opening of the expansion valve 14, and the rotation speed of the outdoor fan 15 based on the setting information and the detection results of each temperature sensor.
- the operation control unit 51 selects and executes one of normal operation, low-capacity operation, and low-air-volume, low-capacity operation according to the conditions described later in each of the cooling operation and the heating operation.
- the operation control unit 51 also turns the thermostat off and on.
- Thermo-off means stopping the compressor 11 when the intake temperature as room temperature reaches the thermo-off threshold.
- the thermo-on means to restart the driving of the compressor 11 when the suction temperature reaches the thermo-on threshold.
- the operation control unit 51 controls the intake temperature detected by the intake temperature sensor 34 to be the set temperature set by the remote controller or the like in any of the normal operation, the low-capacity operation, and the low-airflow-low-capacity operation. , the compressor frequency and the opening of the expansion valve 14 are controlled. In normal operation, the operation control unit 51 determines a first control width ⁇ Fn of the compressor frequency based on the temperature difference ⁇ T between the suction temperature and the set temperature, and adjusts the compressor frequency by the determined first control width ⁇ Fn. Increase or decrease to control compressor 11 . The low-capacity operation and the low air volume low-capacity operation will be explained again.
- the air volume control unit 52 controls the air volume of the indoor fan 22 based on setting information input via a remote controller or the like or the intake temperature detected by the intake temperature sensor 34 .
- the air volume control unit 52 controls the rotation speed of the indoor fan 22 in normal operation so that the air volume of the indoor fan 22 becomes the air volume set by the user via the remote controller or the predetermined air volume (for example, the maximum air volume). to control.
- the wind direction control unit 53 controls the wind direction plate 23 (see FIG. 8 described later) provided at the outlet 20b.
- cooling operation The operation of the air conditioner 100 during cooling operation will be described.
- the refrigerant compressed by the compressor 11 into a high-temperature, high-pressure gas flows into the outdoor heat exchanger 13 functioning as a condenser.
- the refrigerant undergoes a phase change from a high-temperature, high-pressure gas to a liquid in the outdoor heat exchanger 13 and heats the air passing through the outdoor heat exchanger 13 .
- the refrigerant is decompressed by the expansion valve 14 whose opening is set to be small, becomes a two-phase state in which low-temperature and low-pressure liquid and gas are mixed, and flows into the indoor heat exchanger 21 functioning as an evaporator.
- the refrigerant undergoes a phase change from liquid to gas, cooling the air passing through the indoor heat exchanger 21 . After that, the refrigerant flows into the compressor 11 and is compressed again into a high-temperature, high-pressure gas.
- FIG. 3 is a diagram showing the operation of the indoor unit 2 according to Embodiment 1 during cooling operation.
- thin arrows indicate the flow of refrigerant
- thick arrows indicate the flow of air.
- the control device 5 sets the opening of the expansion valve 14 to be small. This reduces the pressure of the refrigerant flowing into the indoor heat exchanger 21 .
- the control device 5 sets the degree of superheat calculated from the difference between the inlet temperature of the refrigerant detected by the first temperature sensor 31 and the outlet temperature of the refrigerant detected by the second temperature sensor 32 to a predetermined value. , the opening of the expansion valve 14 is controlled. As shown in FIG.
- the air (A1) in the air-conditioned space S is supplied by the indoor fan 22 to the indoor heat exchanger 21 functioning as an evaporator.
- the indoor heat exchanger 21 cools the passing air. After that, the cooled conditioned air (B1) is supplied into the space S to be air-conditioned.
- FIG. 4 is a diagram showing the change in state of air during cooling operation of the air conditioner 100 according to Embodiment 1.
- FIG. The horizontal axis of FIG. 4 represents temperature [° C.], and the vertical axis represents absolute humidity [kg/kg′].
- Points A1 and B1 in FIG. 4 correspond to (A1) and (B1) in FIG. 3, and indicate the air states of (A1) and (B1).
- the air (A1) that has passed through the indoor heat exchanger 21 is cooled and dehumidified by heat exchange with the refrigerant, and after being in a state of low temperature and high relative humidity, the state of low absolute humidity ( B1), and is supplied to the space S to be air-conditioned as supply air.
- heating operation The operation of the air conditioner 100 during heating operation will be described.
- the refrigerant compressed by the compressor 11 into a high-temperature, high-pressure gas flows into the indoor heat exchanger 21 functioning as a condenser.
- the refrigerant undergoes a phase change from a high-temperature, high-pressure gas to a liquid in the indoor heat exchanger 21 to heat the air passing through the indoor heat exchanger 21 .
- the refrigerant is decompressed by the expansion valve 14 whose opening is set to be small, becomes a two-phase state in which low-temperature and low-pressure liquid and gas are mixed, and flows into the outdoor heat exchanger 13 functioning as an evaporator.
- the refrigerant undergoes a phase change from liquid to gas, cooling the air passing through the outdoor heat exchanger 13 . After that, the refrigerant flows into the compressor 11 and is compressed again into a high-temperature, high-pressure gas.
- FIG. 5 is a diagram showing the operation of the air conditioner 100 according to Embodiment 1 during heating operation.
- thin arrows indicate the flow of refrigerant
- thick arrows indicate the flow of air.
- the control device 5 sets the opening degree of the expansion valve 14 to be small. As a result, the pressure of the refrigerant flowing into the outdoor heat exchanger 13 is lowered. Further, the control device 5 sets the degree of subcooling calculated from the difference between the refrigerant outlet temperature detected by the first temperature sensor 31 and the refrigerant condensation temperature detected by the third temperature sensor 33 to a predetermined value.
- the opening degree of the expansion valve 14 is controlled so that As shown in FIG.
- the air (A2) in the air-conditioned space S is supplied by the indoor fan 22 to the indoor heat exchanger 21 functioning as a condenser.
- the indoor heat exchanger 21 heats the passing air.
- the heated conditioned air (B2) is supplied to the space S to be air-conditioned.
- FIG. 6 is a diagram showing the change in the state of air during the heating operation of the air conditioner 100 according to Embodiment 1.
- FIG. The horizontal axis of FIG. 6 represents temperature [° C.], and the vertical axis represents absolute humidity [kg/kg′].
- Points A2 and B2 in FIG. 6 correspond to (A2) and (B2) in FIG. 5, and indicate the air states of (A2) and (B2).
- the air (A2) that has passed through the indoor heat exchanger 21 is heated by heat exchange with the refrigerant to reach a high temperature state (B2), and is supplied to the air-conditioned space S as supply air. .
- the air conditioner 100 When the operating state of the air conditioner 100 is in the low capacity state, specifically, for example, the air conditioner 100 is operating at the minimum air conditioning capacity of the air conditioner 100, for example, 600W.
- the low capacity state is a state of operation at about 27% of the rated capacity.
- the low capacity state refers to a state in which the air conditioner 100 is operated with "cooling capacity or heating capacity of 600 W or less" or "about 30% or less of the rated capacity of the air conditioner 100". shall point to Hereinafter, the time when the air conditioner 100 is in the low capacity state is referred to as "low capacity time".
- the ratio of capacity that changes per 1 Hz of the compressor frequency is greater than when the air conditioner 100 is in a normal state in which the capacity is higher than when the capacity is low.
- the air-conditioning capacity fluctuates by 2% by changing the compressor frequency by 1 Hz.
- the air conditioning capacity increases from X% to X+2%.
- the air conditioning capacity fluctuates by 10% by changing the compressor frequency by 1 Hz.
- the compressor frequency is increased from 10 Hz to 11 Hz
- the air conditioning capacity increases from Y% to Y+10%.
- the rate of change in air-conditioning capacity increases during low-capacity times compared to normal times. Therefore, if the compressor frequency is changed with the same first control width ⁇ Fn as in the normal time, the suction temperature will overshoot when the capacity is low. Repeated overshoots of the suction temperature above the set temperature and below the set temperature cause the suction temperature to oscillate up and down, making it impossible to perform stable control to keep the suction temperature at the set temperature.
- the compressor 11 stops.
- the compressor 11 is restarted. That is, when the compressor frequency is changed by the same first control width ⁇ Fn as in the normal time, the frequency of start/stop operation of the compressor 11 increases when the capacity is low.
- the startup frequency when the thermostat is on is higher than the compressor frequency when the thermostat is off. Therefore, when the thermostat is on, the compressor operates at a high frequency, which increases power consumption and does not save energy. That is, when overshooting occurs, energy saving performance is lowered.
- the air conditioner 100 performs low-capacity operation when it is low-capacity.
- the low-capacity operation is an operation in which the control width of the compressor frequency is made smaller than the first control width ⁇ Fn in the normal operation performed normally. That is, the air conditioner 100 controls the compressor frequency with a second control width ⁇ Fl1 that is smaller than the first control width ⁇ Fn, which is determined according to the temperature difference ⁇ T between the set temperature and the suction temperature. Increase or decrease to control compressor 11 .
- the air conditioning apparatus 100 reduces the proportional gain to 50% or less of that in normal operation as control for making the control width smaller than that in normal operation.
- FIG. 7 is an explanatory diagram of the effect of low-capacity operation in the air conditioner 100 according to Embodiment 1.
- FIG. (a) and (b) of FIG. 7 show operating waveforms when the first control width ⁇ Fn is used at the time of low power.
- the horizontal axis of (a) is time, and the vertical axis is suction temperature [°C].
- the horizontal axis of (b) is time, and the vertical axis is compressor frequency [Hz].
- (c) and (d) of FIG. 7 show operating waveforms when the second control width ⁇ Fl1 is used at the time of low power.
- the horizontal axis of (c) is time, and the vertical axis is suction temperature [°C].
- the horizontal axis of (d) is time, and the vertical axis is compressor frequency [Hz].
- the dotted lines in FIGS. 7(b) and 7(d) indicate the intake temperature.
- the suction temperature is as follows. . As shown in FIG. 7(c), the suction temperature decreases more gently than in FIG. 7(a) and stabilizes at the set temperature Tset.
- the air conditioner 100 performs low-capacity operation during low-capacity operation, thereby suppressing fluctuations and overshoots of the suction temperature, and as a result, reducing power consumption.
- the case where the air volume is relatively small is the case where the rotation speed of the indoor fan 22 is equal to or lower than the preset fan rotation speed RPMset.
- the air volume is relatively small, a short cycle occurs as shown in FIG. 8 below.
- FIG. 8 is an explanatory diagram of the short cycle.
- FIG. 8 shows a wall-mounted indoor unit 2 .
- a housing 20 of the indoor unit 2 is formed with an intake port 20a for sucking air into the housing 20 and a blowing port 20b for blowing air into the room.
- the short cycle means that in the indoor unit 2 in which the positions of the outlet 20b and the suction port 20a are close to each other, when the amount of air blown from the outlet 20b is small, the air blown from the outlet 20b reaches the suction port 20a. means to go back.
- Such a short cycle is not limited to the wall-mounted type indoor unit 2, but is other than those in which the positions of the air outlet and the air inlet can be changed by a duct, and the air outlet and the air inlet are located close to each other. But it happens.
- the temperature of the air blown out from the air outlet 20b during cooling is lower at low air volume than at high air volume. , during heating, it is higher at low air volume than at high air volume. Therefore, when the room temperature is detected by the suction temperature sensor 34 installed at the suction port 20a, when a short cycle occurs, the air conditioner 100 erroneously detects the blowout temperature as room temperature, and the room temperature reaches the set temperature. There is a possibility of erroneously judging and turning off the thermostat. Therefore, when the capacity is low and the air volume is low, the air conditioner 100 performs the low air volume and low capacity operation.
- the low air volume low capacity operation is an operation in which the compressor 11 is controlled with a third control width ⁇ Fl2 that is even smaller than the second control width ⁇ Fl1 in the low capacity operation.
- the air conditioner 100 can reduce room temperature erroneous detection caused by the short cycle.
- the air conditioner 100 sets the proportional gain to, for example, 30% or less of the normal operation.
- thermo-off threshold in order to reduce thermo-off due to room temperature error detection caused by a short cycle, it is also effective to change the thermo-off threshold for a predetermined time (for example, 5 minutes) from the start of low air volume low capacity operation. .
- the thermo-off threshold during normal operation is set temperature minus 1°C, but by changing the set temperature to minus 2°C, a short cycle occurs and the temperature is lower than the actual room temperature. It is possible to suppress the occurrence of thermo-off when the temperature is erroneously detected as room temperature.
- thermo-off threshold during normal operation is the set temperature plus 1°C, but by changing it to the set temperature plus 2°C, a short cycle occurs and the temperature higher than the actual room temperature is mistaken for room temperature. It is possible to suppress the occurrence of thermo-off when it is detected.
- thermo-off threshold is changed for the purpose described above.
- the air conditioner 100 changes the thermo-off threshold in the direction of widening the difference between the set temperature and the thermo-off threshold in the low air volume, low-capacity operation as compared to the normal operation. By changing the thermo-off condition in this way, the air conditioner 100 can suppress occurrence of thermo-off and improve controllability even when room temperature is erroneously detected due to a short cycle.
- FIG. 9 is an explanatory diagram of the effects of the low air volume, low capacity operation in the air conditioner 100 according to Embodiment 1.
- FIG. (a) and (b) of FIG. 9 show operating waveforms when the thermo-off threshold is the same as the thermo-off threshold Toff1 during normal operation when the air capacity is low and the air volume is low.
- the horizontal axis of (a) is time, and the vertical axis is suction temperature [°C].
- the horizontal axis of (b) is time, and the vertical axis is compressor frequency [Hz].
- (c) and (d) of FIG. 9 show operating waveforms when the thermo-off threshold is set to Toff2, which is lower than the thermo-off threshold Toff1 during normal operation, when the air capacity is low and the air volume is low.
- the horizontal axis of (c) is time, and the vertical axis is suction temperature [°C].
- the horizontal axis of (d) is time, and the vertical axis is compressor frequency [Hz].
- the control width ⁇ Fl1 is indicated by a dotted line for comparison with the control width ⁇ Fl2.
- thermo-on threshold is the same at Ton1.
- 9(a) and 9(c) have different thermo-off thresholds, Toff1 in FIG. 9(a) and Toff2 in FIG. 9(c). Since the thermo-off threshold is different in this way, the difference between the set temperature Tset and the thermo-off threshold widens from ⁇ Tn to ⁇ Tl in FIG. 9(c).
- Fset is a set frequency which will be described later.
- thermo-off threshold Toff1 for normal operation when used at low capacity and low air volume, if an erroneous detection of a sudden drop in intake temperature due to a short cycle occurs, the thermo-off threshold Toff1 easy to reach.
- the compressor 11 turns off the thermostat at time t1, and after that, thermo-on and thermo-off are repeated, and the air conditioner 100 starts and stops.
- the air conditioner 100 uses a thermo-off threshold Toff2 that is lower than the thermo-off threshold Toff1 as the thermo-off threshold, and sets the temperature Tset to the thermo-off threshold. Expand the difference from ⁇ Tn to ⁇ Tl. Thereby, the air conditioner 100 can avoid thermo-off as shown in FIG.9(d). That is, even if an erroneous detection occurs due to a sudden drop in the suction temperature due to a short cycle, the suction temperature does not reach the thermo-off threshold value Toff2, so that the thermo-off can be avoided.
- the temperature gradually decreases and stabilizes at the set temperature Tset.
- the air conditioner 100 performs low-capacity operation when the air capacity is low and the air volume exceeds the set air volume, and performs low-air volume low-capacity operation when the air capacity is low and the air volume is equal to or less than the set air volume. . Specifically, the air conditioner 100 performs low-capacity operation when the compressor frequency is equal to or lower than a preset set frequency and the fan rotation speed exceeds a preset set rotation speed. The air conditioner 100 performs the low air volume, low capacity operation when the compressor frequency is equal to or lower than the set frequency and the fan rotation speed is equal to or lower than the set rotation speed. It is assumed that the air volume of the indoor fan 22 in the low air volume capacity operation is not 0 (zero).
- the low-capacity operation is an operation in which the control width of the compressor frequency is set to a second control width ⁇ Fl1 that is smaller than the first control width ⁇ Fn during normal operation.
- the low air volume and low capacity operation means that the control width of the compressor frequency is set to a third control width ⁇ Fl2 that is smaller than the second control width ⁇ Fl1 during low capacity operation, and the difference between the set temperature and the thermo-off threshold is normal operation. This is driving that changes the thermo-off threshold in a direction that spreads more than time.
- FIG. 10 is a flowchart showing the transition from normal operation to low capacity operation or low air volume low capacity operation in the air conditioner 100 according to Embodiment 1.
- FIG. The flowchart of FIG. 10 is executed by the control device 5 .
- the control device 5 performs normal cooling operation or heating operation (step S10).
- the controller 5 controls the compressor frequency F of the compressor 11 and the opening degree of the expansion valve 14 so that the suction temperature T becomes the set temperature Tset as described above.
- the air volume control unit 52 controls the air volume of the indoor fan 22 so that the air volume of the indoor fan 22 becomes the air volume set by the user via a remote control or the like, or a predetermined air volume (for example, maximum air volume). Controls fan speed RPM.
- the operation control unit 51 determines whether the compressor frequency F is equal to or lower than the preset set frequency Fset (step S11).
- the set frequency Fset is the lower limit frequency of the compressor 11, for example +10 Hz.
- the lower limit frequency is the lower limit frequency for use, which is necessary for safe operation of the compressor 11 without failure.
- step S11 NO
- step S11: YES the operation control unit 51 determines whether the fan rotation speed RPM of the indoor fan 22 is equal to or lower than the preset rotation speed threshold RPMset (step S13).
- the rotational speed threshold RPMset is, for example, 30% of the maximum rotational speed of the indoor fan 22 .
- the maximum number of rotations is the maximum number of rotations required for safe operation without failure of the indoor fan 22 .
- step S13: NO When the fan rotation speed RPM exceeds the rotation speed threshold RPMset (step S13: NO), the operation control unit 51 transitions from normal operation to low-capacity operation (step S14). On the other hand, when the fan rotation speed RPM is equal to or lower than the rotation speed threshold RPMset (step S13: YES), the operation control unit 51 transitions from normal operation to low air volume low capacity operation (step S15). Then, the air conditioner 100 returns to step S11 and repeats the above operation.
- the air conditioner 100 controls the fan rotation speed RPM so as to automatically decrease the air volume when transitioning from normal operation to low-capacity operation. This makes it possible to achieve efficient operation even when the capacity is low.
- the point that the COP (Coefficient of Performance) is improved by reducing the air volume when the capacity is low will be described below.
- FIG. 11 is a diagram showing the relationship between the air conditioning capacity and equipment efficiency according to the fan speed.
- the horizontal axis of FIG. 11 is the air conditioning capacity [W], and the vertical axis is the COP.
- FIG. 11 shows the relationship between the air-conditioning capacity and the COP when the fan speed is the maximum RPMmax, and the relationship between the air-conditioning capacity and the COP when the fan speed RPM is RPMset.
- RPMmax has a higher COP than RPMset under conditions where the air conditioning capacity exceeds C1.
- the air conditioning capacity is high, the COP is higher when the air volume is high than when the air volume is low. This is because the increase in efficiency caused by the decrease in the differential pressure between the high pressure and the low pressure in the refrigeration cycle due to an increase in the amount of air blown to the indoor heat exchanger 21 is greater than the increase in fan input. be.
- RPMset has a higher COP than RPMmax.
- the COP is higher when the air volume is smaller than when the air volume is large.
- the operation in which the fan rotation speed RPM is set to RPMset or less when the capacity is low is an operation with a high COP.
- the air conditioner 100 automatically lowers the fan rotation speed RPM so that it becomes equal to or less than the RPMset. do. In other words, the air conditioner 100 automatically transitions from the low-capacity operation to the low-air-volume low-capacity operation when the air volume is set to "automatic" and the capacity is low. As a result, the air conditioner 100 can realize efficient operation even when the capacity is low.
- the transition from low-capacity operation to normal operation corresponds to, for example, the case where the set temperature is changed from 27° C. to 20° C. in cooling operation. In this case, by immediately returning the control width of the compressor frequency F to the first control width ⁇ Fn for normal operation, it is possible to reach the set temperature early.
- the air conditioner 100 is not limited to the configuration shown in FIG. 1, and can be modified, for example, as follows without departing from the gist of the present disclosure.
- FIG. 12 is a diagram showing a schematic configuration of Modification 1 of air-conditioning apparatus 100 according to Embodiment 1.
- the air conditioner 100 of Modification 1 includes a second room temperature sensor 60 capable of detecting the room temperature in the space S to be air-conditioned, in addition to the intake temperature sensor 34 .
- FIG. 12 shows an example in which the remote controller 61 for operating the indoor unit 2 is provided with the second room temperature sensor 60, but the second room temperature sensor 60 is not limited to the temperature sensor provided in the remote controller 61.
- the harmony device 100 is equipped with a radiation thermometer, it may be a radiation thermometer.
- the second room temperature sensor 60 may be any sensor that can detect the room temperature without being affected by the short cycle.
- the air conditioner 100 controls the compressor frequency F in cooperation with the intake temperature sensor 34 and the second room temperature sensor 60 during low air volume, low capacity operation.
- the air conditioner 100 compares the suction temperature detected by the suction temperature sensor 34 with the room temperature detected by the second room temperature sensor 60 (hereinafter referred to as second room temperature) during low air volume, low capacity operation.
- second room temperature the room temperature detected by the second room temperature sensor 60
- the air conditioning apparatus 100 changes the temperature sensor used for thermo-off determination from the intake temperature sensor 34 to the second room temperature sensor 60 .
- the air conditioner 100 can suppress the occurrence of thermo-off due to erroneous room temperature detection due to short cycles.
- the air conditioner 100 controls the compressor 11 based on the second room temperature when the temperature difference between the suction temperature and the second room temperature is equal to or greater than a preset threshold temperature difference during low air volume, low capacity operation. control.
- the control device 5 uses a second room temperature sensor provided in other equipment such as an air purifier placed in the air-conditioned space S. may be used to perform similar control.
- the control device 5 includes a receiver 5a that receives room temperature detected by a second room temperature sensor arranged in another device. When the temperature difference between the room temperature detected by the suction temperature sensor 34 and the room temperature received by the receiver 5a is equal to or greater than a preset threshold temperature difference, the controller 5 uses the room temperature received by the receiver 5a to 11 is controlled.
- FIG. 13 is a schematic configuration diagram showing Modification 2 of air-conditioning apparatus 100 according to Embodiment 1.
- the air conditioner 100 includes an external communication unit 70 that can communicate with an external server 80 .
- the optimal values for the control width, thermo-off threshold, and thermo-on threshold change depending on various information such as heat insulation, airtightness, room layout, installation location, and weather, in addition to device setting information. Therefore, the control device 5 transmits a control information request including the operation information of the air conditioner 100 to the external server 80 holding these various types of information via the external communication unit 70 .
- the control device 5 performs control based on control information received from the external server 80 via the external communication unit 70 as a response to the control information request.
- the calculation unit of the external server 80 Upon receiving the control information request, the calculation unit of the external server 80 calculates the optimum values of the control width, the thermo-off threshold, and the thermo-on threshold based on the operation information included in the control information request and various information held by itself. Obtained by learning by machine learning. External server 80 transmits the learning result to air conditioner 100 as control information.
- the operating information is, for example, the amount of change in room temperature with respect to the amount of change in compressor frequency per control time interval. By learning the effects of weather, time of day, outside air temperature, etc. on the amount of room temperature fluctuation, it is possible to set the control range and the like so that the room temperature does not change excessively.
- the air conditioner 100 changes the control width, thermo-off threshold, and thermo-on threshold based on the received control information. As a result, the air conditioner 100 can perform control in consideration of heat insulation, airtightness, floor plan, installation position, weather, etc. of the house, and further reduction in power consumption can be expected.
- the air-conditioning apparatus 100 of Embodiment 1 is arranged in the air-conditioned space S, and has the indoor heat exchanger 21 and the indoor fan 22 that blows air to the indoor heat exchanger 21, and the compressor 11, and a room temperature sensor for detecting the room temperature in the space S to be air-conditioned.
- the air conditioner 100 is a device that performs control to increase or decrease the compressor frequency of the compressor 11 within a control range based on the temperature difference between the room temperature detected by the room temperature sensor and the set temperature. exceeds a preset set frequency, the control device 5 performs normal operation for controlling the compressor 11 by setting the control width to the first control width.
- the control device 5 sets the control width to a second control width smaller than the first control width and compresses Perform low-capacity operation to control the machine.
- the control device 5 sets the control width to a third control width smaller than the second control width to control the compressor. Low air volume and low capacity operation is performed.
- the air conditioner 100 can suppress the overshoot and improve the controllability, reduce the influence on the controllability of the short cycle, and reduce the power consumption due to the start and stop operation of the compressor 11. increase can be suppressed. In other words, the air conditioner 100 can achieve both improved controllability and reduced power consumption during low performance. In addition, the air conditioner 100 can improve comfort by suppressing fluctuations in room temperature caused by the starting and stopping of the compressor 11 . In addition, the air conditioner 100 can improve comfort by stabilizing the refrigeration cycle.
- the room temperature sensor is an intake temperature sensor 34 which is arranged in the indoor unit 2 and detects the intake temperature of the air sucked into the indoor unit 2 .
- the control device 5 performs thermo-off to stop the compressor 11 when the suction temperature detected by the suction temperature sensor 34 reaches the thermo-off threshold, and when the suction temperature reaches the thermo-on threshold.
- a thermo-on is performed to restart the driving of the compressor 11 .
- the controller 5 changes the thermo-off threshold for a certain period of time from the start of the low air volume, low-capacity operation so that the temperature difference from the set temperature is wider than the thermo-off threshold for normal operation.
- the air conditioner 100 can suppress the occurrence of thermo-off due to erroneous detection of the room temperature due to the short cycle.
- the room temperature sensor is an intake temperature sensor 34 which is arranged in the indoor unit 2 and detects the intake temperature of the air sucked into the indoor unit 2 .
- the air conditioner 100 includes a second room temperature sensor 60 that detects the room temperature in the air-conditioned space S separately from the intake temperature sensor 34 .
- the control device 5 sets the second room temperature.
- the room temperature detected by the sensor 60 is used to control the compressor 11 .
- the air conditioner 100 can suppress the occurrence of thermo-off due to erroneous detection of the room temperature due to the short cycle.
- the room temperature sensor is an intake temperature sensor 34 which is arranged in the indoor unit 2 and detects the intake temperature of the air sucked into the indoor unit 2 .
- the air conditioner 100 includes a receiver 5a that receives the room temperature in the air-conditioned space S detected by the second room temperature sensor of the equipment installed in the air-conditioned space S.
- the control device 5 detects the room temperature received by the receiver 5a. is used to control the compressor 11 .
- the air conditioner 100 can suppress the occurrence of thermo-off due to erroneous detection of the room temperature due to the short cycle.
- the air conditioner 100 includes an external communication unit 70 capable of communicating with an external server 80.
- the control device 5 transmits a control information request including operation information to the external server 80 via the external communication unit 70, and based on the control information received from the external server 80 via the external communication unit 70 as a response to the control information request. to change the control width, thermo-off threshold, and thermo-on threshold.
- the air conditioner 100 can perform control based on the control width, thermo-off threshold, and thermo-on threshold that take into consideration various information held by the external server 80, and can be expected to reduce power consumption.
- Embodiment 2 differs from Embodiment 1 in the details of the low air volume, low capacity operation. Other controls and configurations are the same as or equivalent to those of the first embodiment.
- the second embodiment will be described with a focus on the configuration different from the first embodiment, and the configurations not described in the second embodiment are the same as those in the first embodiment.
- the low air volume, low capacity operation of the second embodiment also makes the control time interval of the compressor frequency longer than during normal operation.
- the air conditioner 100 performs control to increase the integration time in the case of PID control.
- the control time interval during normal operation and the control time interval during low-capacity operation are the same.
- the control time interval is the time from when the controller 5 outputs a compressor frequency control command to the compressor 11 until when the next compressor frequency control command is output.
- FIG. 14 is an explanatory diagram of the effect of the low air volume, low capacity operation of the air conditioner 100 according to the second embodiment.
- (a) and (b) of FIG. 14 show operating waveforms when the compressor frequency control time interval is the same as the control time interval ⁇ tn during normal operation at low capacity and low air volume.
- the horizontal axis of (a) is time, and the vertical axis is suction temperature [°C].
- the horizontal axis of (b) is time, and the vertical axis is compressor frequency [Hz].
- (c) and (d) of FIG. 14 are operation waveforms when the control time interval of the compressor frequency F is set to a control time interval ⁇ tl longer than the control time interval ⁇ tn during normal operation at low capacity and low air volume. be.
- the horizontal axis of (c) is time, and the vertical axis is suction temperature [°C].
- the horizontal axis of (d) is time, and the vertical axis is compressor frequency [Hz].
- the air conditioner 100 can improve the controllability of the entire refrigeration cycle by making the control time interval of the compressor frequency longer in the low air volume, low capacity operation than in the normal operation.
- Modification 2 of Embodiment 1 can also be applied to Embodiment 2. That is, the air conditioner 100 transmits a control information request including operation information to the external server 80 (see FIG. 13) holding various kinds of information via the external communication unit 70 . The air conditioner 100 performs control based on control information received as a response to the control information request. Upon receiving the control information request, the calculation unit of the external server 80 learns the optimum value of the control time interval through machine learning based on the operation information included in the control information request and various information held by itself. and transmits the learning result to the air conditioner 100 .
- the operating information is, for example, the amount of change in room temperature with respect to the amount of change in compressor frequency per control time interval. By learning the effects of weather, time of day, outside air temperature, etc. on room temperature fluctuations, it is possible to set control time intervals and the like so that room temperature changes do not become excessive.
- the air conditioner 100 changes the control time interval based on the received control information. As a result, the air conditioner 100 can perform control in consideration of heat insulation, airtightness, floor plan, installation position, weather, etc. of the house, and further reduction in power consumption can be expected.
- the indoor unit and the outdoor unit are combined into one unit, but it can be modified such that a plurality of indoor units are connected, or two compressors are connected. .
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Abstract
Description
(空気調和装置の構成)
図1は、実施の形態1に係る空気調和装置100の概略構成図である。図1に示すように、実施の形態1の空気調和装置100は、空調対象空間の外に配置される室外機1と、空調対象空間内に配置される室内機2とを備えている。室外機1と室内機2とは、配管36によって接続されている。また、室外機1と室内機2とは、電源線または信号線等の配線(図示せず)によって接続されている。室外機1は、圧縮機11と、流路切替弁12と、室外熱交換器13と、膨張弁14と、室外ファン15と、を備えている。室内機2は、室内熱交換器21と、室内ファン22と、第1温度センサ31と、第2温度センサ32と、第3温度センサ33と、室温センサである吸込み温度センサ34と、吹出し温度センサ35と、制御装置5と、を備えている。
図2は、実施の形態1に係る空気調和装置100の制御ブロック図である。図2に示すように、空気調和装置100の制御装置5は、機能部として、運転制御部51、風量制御部52および風向制御部53を有する。各機能部は、制御装置5がプログラムを実行することにより実現されるか、または専用の処理回路により実現される。
空気調和装置100の冷房運転時の動作について説明する。冷房運転時においては、まず、圧縮機11で圧縮され、高温高圧の気体となった冷媒が凝縮器として機能する室外熱交換器13に流入する。冷媒は、室外熱交換器13にて高温高圧の気体から液体に相変化し、室外熱交換器13を通過する空気を加熱する。その後、冷媒は開度が小さく設定された膨張弁14にて減圧され、低温低圧の液体と気体とが混在した二相状態になり、蒸発器として機能する室内熱交換器21に流入する。室内熱交換器21において、冷媒は、液体から気体に相変化し、室内熱交換器21を通過する空気を冷却する。その後、冷媒は圧縮機11に流入し、再度、圧縮されて高温高圧の気体となる。
空気調和装置100の暖房運転時の動作について説明する。暖房運転時においては、圧縮機11で圧縮され、高温高圧の気体となった冷媒が凝縮器として機能する室内熱交換器21に流入する。冷媒は、室内熱交換器21にて高温高圧の気体から液体に相変化し、室内熱交換器21を通過する空気を加熱する。その後、冷媒は開度を小さく設定された膨張弁14にて減圧され、低温低圧の液体と気体が混在した二相状態になり、蒸発器として機能する室外熱交換器13に流入する。室外熱交換器13において、冷媒は、液体から気体に相変化し、室外熱交換器13を通過する空気を冷却する。その後、冷媒は圧縮機11に流入し、再度、圧縮されて高温高圧の気体となる。
図12は、実施の形態1に係る空気調和装置100の変形例1の概略構成を示す図である。
変形例1の空気調和装置100は、吸込み温度センサ34とは別に、空調対象空間S内の室温を検知可能な第2の室温センサ60を備えている。図12では、室内機2を操作するためのリモコン61に第2の室温センサ60を備えた例を示しているが、第2の室温センサ60はリモコン61に備えた温度センサに限らず、空気調和装置100が放射温度計を備えている場合には放射温度計でもよい。第2の室温センサ60は、要するに、ショートサイクルの影響を受けずに室温を検知できるセンサであればよい。
図13は、実施の形態1に係る空気調和装置100の変形例2を示す概略構成図である。空気調和装置100は、外部サーバ80と通信可能な外部通信部70を備えている。制御幅、サーモオフ閾値およびサーモオン閾値の最適値は、機器の設定情報以外にも住宅の断熱、気密性能、間取り、設置位置および天候などの各種情報によって変化する。したがって、制御装置5は、これらの各種情報を保持している外部サーバ80に、空気調和装置100の運転情報を含む制御情報要求を外部通信部70を介して送信する。制御装置5は、制御情報要求に対する応答として外部サーバ80から外部通信部70を介して受信した制御情報に基づいて制御を行う。
実施の形態2は、低風量低能力運転の運転内容が実施の形態1と異なる。その他の制御および構成については実施の形態1と同一または同等である。以下、実施の形態2が実施の形態1と異なる構成を中心に説明するものとし、実施の形態2で説明されていない構成は実施の形態1と同様である。
Claims (8)
- 空調対象空間に配置され、室内熱交換器および室内熱交換器に送風する室内ファンを有する室内機と、
圧縮機を有する室外機と、
前記空調対象空間内の室温を検知する室温センサと、
前記室温センサにより検知された室温と設定温度との差温に基づく制御幅で前記圧縮機の圧縮機周波数を増加または減少させる制御を行う装置であって、前記圧縮機周波数が予め設定された設定周波数を超える場合、前記制御幅を第1の制御幅にして前記圧縮機を制御する通常運転を行う制御装置と、
を備え、
前記制御装置は、
前記圧縮機周波数が前記設定周波数以下、且つ前記室内ファンの回転数が予め設定された設定回転数を超える場合、前記制御幅を前記第1の制御幅よりも小さい第2の制御幅にして前記圧縮機を制御する低能力運転を行い、
前記圧縮機周波数が前記設定周波数以下、且つ前記室内ファンの回転数が前記設定回転数以下の場合、前記制御幅を前記第2の制御幅よりも小さい第3の制御幅にして前記圧縮機を制御する低風量低能力運転を行う空気調和装置。 - 前記室温センサは、前記室内機に配置され、前記室内機内に吸込まれる空気の吸込み温度を検知する吸込み温度センサであり、
前記制御装置は、前記通常運転および前記低風量低能力運転のそれぞれにおいて、前記吸込み温度センサにより検知された吸込み温度がサーモオフ閾値に到達すると前記圧縮機を停止するサーモオフと、前記吸込み温度がサーモオン閾値に到達すると前記圧縮機の駆動を再開するサーモオンとを行っており、前記低風量低能力運転の開始から一定時間、前記サーモオフ閾値を、前記通常運転における前記サーモオフ閾値よりも、前記設定温度との温度差が広がる方向に変更する請求項1記載の空気調和装置。 - 前記室温センサは、前記室内機に配置され、前記室内機内に吸込まれる空気の吸込み温度を検知する吸込み温度センサであり、
前記吸込み温度センサとは別に前記空調対象空間内の室温を検知する第2の室温センサを備え、
前記制御装置は、
前記低風量低能力運転時に、前記吸込み温度センサで検知した室温と前記第2の室温センサで検知した室温との温度差が予め設定した閾値温度差以上の場合、前記第2の室温センサで検知した室温を用いて前記圧縮機を制御する請求項1記載の空気調和装置。 - 前記室温センサは、前記室内機に配置され、前記室内機内に吸込まれる空気の吸込み温度を検知する吸込み温度センサであり、
前記空調対象空間内に設置された機器が有する第2の室温センサで検知された前記空調対象空間内の室温を受信する受信部を備え、
前記制御装置は、
前記低風量低能力運転時に、前記吸込み温度センサで検知した室温と前記受信部で受信した前記室温との温度差が予め設定した閾値温度差以上の場合、前記受信部で受信した室温を用いて前記圧縮機を制御する請求項1記載の空気調和装置。 - 前記制御装置は、
前記低風量低能力運転における前記圧縮機周波数の制御時間間隔を前記通常運転における前記圧縮機周波数の制御時間間隔よりも長くする請求項1~請求項4のいずれか一項に記載の空気調和装置。 - 外部サーバと通信可能な外部通信部を備え、
前記制御装置は、運転情報を含む制御情報要求を前記外部通信部を介して前記外部サーバに送信し、前記制御情報要求に対する応答として前記外部サーバから前記外部通信部を介して受信した制御情報に基づいて前記制御幅を変更する請求項1~請求項5のいずれか一項に記載の空気調和装置。 - 前記制御装置は、前記外部通信部を介して受信した前記制御情報に基づいて前記サーモオフ閾値および前記サーモオン閾値を変更する請求項2に従属する請求項5または請求項6記載の空気調和装置。
- 前記制御装置は、前記外部通信部を介して受信した前記制御情報に基づいて前記制御時間間隔を変更する請求項5に従属する請求項6または請求項7記載の空気調和装置。
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH09119698A (ja) * | 1995-10-26 | 1997-05-06 | Matsushita Electric Ind Co Ltd | 空気調和機 |
JP2001116329A (ja) * | 1999-10-14 | 2001-04-27 | Matsushita Electric Ind Co Ltd | 空気調和装置の制御 |
JP2002115923A (ja) | 2000-10-06 | 2002-04-19 | Mitsubishi Electric Corp | 冷凍装置、冷凍装置の制御方法 |
JP2006275460A (ja) | 2005-03-30 | 2006-10-12 | Mitsubishi Electric Corp | 空気調和装置及び空気調和方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH09119698A (ja) * | 1995-10-26 | 1997-05-06 | Matsushita Electric Ind Co Ltd | 空気調和機 |
JP2001116329A (ja) * | 1999-10-14 | 2001-04-27 | Matsushita Electric Ind Co Ltd | 空気調和装置の制御 |
JP2002115923A (ja) | 2000-10-06 | 2002-04-19 | Mitsubishi Electric Corp | 冷凍装置、冷凍装置の制御方法 |
JP2006275460A (ja) | 2005-03-30 | 2006-10-12 | Mitsubishi Electric Corp | 空気調和装置及び空気調和方法 |
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