WO2022145004A1 - 空気調和機および室内機 - Google Patents
空気調和機および室内機 Download PDFInfo
- Publication number
- WO2022145004A1 WO2022145004A1 PCT/JP2020/049201 JP2020049201W WO2022145004A1 WO 2022145004 A1 WO2022145004 A1 WO 2022145004A1 JP 2020049201 W JP2020049201 W JP 2020049201W WO 2022145004 A1 WO2022145004 A1 WO 2022145004A1
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- WIPO (PCT)
- Prior art keywords
- heat exchanger
- expansion valve
- connection port
- indoor
- refrigerant
- Prior art date
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- 239000003507 refrigerant Substances 0.000 claims abstract description 166
- 239000007788 liquid Substances 0.000 description 28
- 230000000052 comparative effect Effects 0.000 description 21
- 238000010586 diagram Methods 0.000 description 18
- 238000001816 cooling Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 238000007791 dehumidification Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
- F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0068—Indoor units, e.g. fan coil units characterised by the arrangement of refrigerant piping outside the heat exchanger within the unit casing
-
- 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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
-
- 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
- F24F2110/20—Humidity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/021—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit
- F25B2313/0212—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit the auxiliary heat exchanger being only used during dehumidifying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/031—Sensor arrangements
- F25B2313/0314—Temperature sensors near the indoor heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2104—Temperatures of an indoor room or compartment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
Definitions
- This disclosure relates to air conditioners and indoor units.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-82761 is provided with two indoor heat exchangers connected in series in an indoor unit, and a flow control valve for controlling the flow rate of a refrigerant between the two indoor heat exchangers.
- the air conditioner provided with the above is disclosed. This air conditioner uses a flow control valve to create a pressure difference between the indoor heat exchanger located on the upstream side in the flow direction of the refrigerant and the indoor heat exchanger located on the downstream side in the flow direction of the refrigerant. It is configured.
- the indoor heat exchanger on the upstream side functions as a reheater
- the indoor heat exchanger on the downstream side functions as an evaporator, so that the indoor unit moves from the indoor unit to the indoor space. Controls the temperature and humidity of the blown air.
- the air conditioner disclosed in Japanese Patent Application Laid-Open No. 2001-82761 has the air heated by the indoor heat exchanger on the upstream side and the indoor heat on the downstream side by reducing the opening degree of the flow control valve during the dehumidifying operation.
- the air dehumidified by the exchanger is mixed and blown out into the indoor space, whereby dehumidification can be performed while preventing the room temperature from dropping excessively below the set temperature.
- the opening degree of the flow control valve is reduced, a large amount of liquid refrigerant may be retained in the indoor heat exchanger on the upstream side. Therefore, it is necessary to pre-fill the refrigerant circuit with an amount of refrigerant assuming the accumulated amount. There was a problem that the cost would increase.
- the present disclosure has been made to solve the above problems, and to provide an air conditioner and an indoor unit capable of controlling the temperature and humidity of the air blown into the indoor space while suppressing the cost. With the goal.
- the air conditioner according to the present disclosure includes an outdoor unit and an indoor unit.
- the indoor unit has a first connection port connected to the outdoor unit and configured to allow the refrigerant to flow, and a second connection port connected to the outdoor unit and configured to allow the refrigerant to flow.
- a first path provided between the first connection port and the second connection port, a second path provided between the first connection port and the second connection port in parallel with the first path, and a first path.
- a first chamber heat exchanger provided in the path, a first expansion valve provided between the first chamber heat exchanger and the second connection port in the first path, and a second expansion valve provided in the second path. It includes an indoor heat exchanger and a second expansion valve provided between the second indoor heat exchanger and the first connection port in the second path.
- the first indoor heat exchanger is located on the windward side in the flow direction of the air taken into the indoor unit.
- the second indoor heat exchanger is located on the leeward side in the flow direction of the air taken into the indoor unit.
- the indoor unit has a first connection port connected to the outdoor unit and configured to allow the refrigerant to flow, and a second connection port connected to the outdoor unit and configured to allow the refrigerant to flow.
- the second chamber heat exchanger is provided, and a second expansion valve provided between the second chamber heat exchanger and the first connection port in the second path is provided.
- the first indoor heat exchanger is located on the windward side in the flow direction of the air taken into the indoor unit.
- the second indoor heat exchanger is located on the leeward side in the flow direction of the air taken into the indoor unit.
- FIG. 1 is a diagram showing a configuration of an air conditioner 1 according to an embodiment. Note that FIG. 1 functionally shows the connection relationship and the arrangement configuration of each part in the air conditioner 1, and does not necessarily show the arrangement in the physical space.
- the air conditioner 1 includes a refrigerant circuit 4 and a control device 6.
- the refrigerant circuit 4 includes an outdoor unit 2 and an indoor unit 3.
- the indoor unit 3 includes a connection port 121 and a connection port 122.
- the outdoor unit 2 includes a connection port 112 and a connection port 111.
- the connection port 121 of the indoor unit 3 is connected to the connection port 112 of the outdoor unit 2 by the extension pipe 113.
- the connection port 122 of the indoor unit 3 is connected to the connection port 111 of the outdoor unit 2 by the extension pipe 123.
- the indoor unit 3 is configured to be connectable to the outdoor unit 2 via the extension pipe 113 and the extension pipe 123.
- the outdoor unit 2 includes a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, and an expansion valve 41.
- the four-way valve 20 includes a connection port 21, a connection port 22, a connection port 23, and a connection port 24.
- the connection port 21 of the four-way valve 20 is connected to the suction port 11 of the compressor 10 via the pipe 85.
- the connection port 22 of the four-way valve 20 is connected to the connection port 111 of the outdoor unit 2 via the pipe 86.
- the connection port 23 of the four-way valve 20 is connected to the discharge port 12 of the compressor 10 via the pipe 81.
- the connection port 24 of the four-way valve 20 is connected to one end side of the outdoor heat exchanger 30 via the pipe 82.
- the other end side of the outdoor heat exchanger 30 is connected to one end side of the expansion valve 41 via the pipe 83.
- the other end side of the expansion valve 41 is connected to the connection port 112 of the outdoor unit 2 via the pipe 84.
- the air conditioner 1 is controlled to one of a plurality of types of air conditioning modes including a cooling mode for cooling the indoor space to be air-conditioned and a heating mode for heating the indoor space.
- the communication state inside the four-way valve 20 is such that the connection port 21 communicates with the connection port 22 and the connection port 23 communicates with the connection port 24, as shown by the solid line in FIG. That is, in the cooling mode, the suction port 11 of the compressor 10 communicates with the indoor unit 3 and the discharge port 12 of the compressor 10 communicates with the outdoor heat exchanger 30. As a result, the refrigerant flows in the order of the compressor 10, the outdoor heat exchanger 30, the expansion valve 41, and the indoor unit 3.
- the communication state inside the four-way valve 20 is such that the connection port 21 communicates with the connection port 24 and the connection port 22 communicates with the connection port 23, as shown by the broken line in FIG. That is, in the heating mode, the suction port 11 of the compressor 10 communicates with the outdoor heat exchanger 30, and the discharge port 12 of the compressor 10 communicates with the indoor unit 3. As a result, the refrigerant flows in the order of the compressor 10, the indoor unit 3, the expansion valve 41, and the outdoor heat exchanger 30.
- the air conditioner 1 is not limited to the one that can switch between the cooling mode and the heating mode by switching the four-way valve 20.
- the refrigerant circuit 4 may have a circuit configuration dedicated to the cooling mode without the air conditioner 1 including the four-way valve 20.
- the control device 6 includes a processor 61 and a memory 62.
- the processor 61 is an arithmetic unit that controls the refrigerant circuit 4 by executing various programs.
- the processor 61 is composed of, for example, at least one of a CPU (central processing unit), an FPGA (field programmable gate array), and a GPU (graphics processing unit).
- the processor 61 may be configured by a processing circuitry.
- the memory 62 is composed of a volatile memory such as DRAM (dynamic random access memory) and SRAM (static random access memory), or a non-volatile memory such as ROM (read only memory).
- the memory 62 may include an SSD (solid state drive) or an HDD (hard disk drive).
- the compressor 10 In the cooling mode, the compressor 10 sucks the gas refrigerant flowing from the indoor unit 3 from the suction port 11 and compresses the sucked gas refrigerant to increase the pressure of the gas refrigerant.
- the compressor 10 discharges the high-temperature and high-pressure gas refrigerant obtained by compression from the discharge port 12 to the outdoor heat exchanger 30.
- the compressor 10 is configured to change the rotation speed during operation, stop, and operation according to the control of the control device 6.
- the control device 6 arbitrarily changes the drive frequency of the compressor 10 by outputting a control signal to the compressor 10.
- the compressor 10 changes the rotation speed according to the change in the drive frequency, thereby adjusting the discharge amount of the refrigerant.
- Various types of compressors 10 can be adopted, and for example, scroll type, rotary type, screw type and the like can be adopted.
- the outdoor heat exchanger 30 exchanges heat between the high-temperature and high-pressure gas refrigerant flowing from the compressor 10 and the outside air taken in from the outdoor space by the fan 35.
- the refrigerant radiated to the air by heat exchange by the outdoor heat exchanger 30 is condensed inside the outdoor heat exchanger 30 to change into a high-temperature and high-pressure liquid refrigerant.
- the high-temperature and high-pressure liquid refrigerant obtained by heat exchange by the outdoor heat exchanger 30 flows out to the expansion valve 41.
- the expansion valve 41 is, for example, an electronic expansion valve, which lowers the pressure of the high-temperature and high-pressure liquid refrigerant flowing from the outdoor heat exchanger 30.
- the gas-liquid two-phase state refrigerant obtained by decompression by the expansion valve 41 flows out to the indoor unit 3.
- the indoor unit 3 exchanges heat between the gas-liquid two-phase state refrigerant flowing from the outdoor unit 2 and the air taken in from the indoor space by the fan 75.
- the refrigerant absorbed from the air by heat exchange by the indoor unit 3 evaporates inside the indoor unit 3 and changes into a gas refrigerant.
- the low-temperature low-pressure gas refrigerant obtained by heat exchange by the indoor unit 3 flows out to the compressor 10.
- the air absorbed by the refrigerant in the indoor unit 3 is blown out to the indoor space again.
- the indoor space can be cooled by circulating the refrigerant in the refrigerant circuit 4.
- FIG. 2 is a diagram showing a configuration of an air conditioner 100 according to a comparative example.
- FIG. 2 among the configurations included in the air conditioner 100, those having the same functions as the configurations included in the air conditioner 1 according to the above-described embodiment are provided in the air conditioner 1 according to the embodiment. It has the same reference numerals as the configurations, and detailed description thereof will be omitted below.
- the air conditioner 100 includes a refrigerant circuit 400 including an outdoor unit 2 and an indoor unit 300.
- the indoor unit 300 is connected to the outdoor unit 2 via the extension pipe 113 and the extension pipe 123.
- the indoor unit 300 includes a first indoor heat exchanger 171 and a second indoor heat exchanger 172, an expansion valve 142, and a fan 175.
- connection port 121 of the indoor unit 300 is connected to one end side of the first indoor heat exchanger 171 by a pipe 101.
- the other end side of the first chamber heat exchanger 171 is connected to one end side of the expansion valve 142 by a pipe 102.
- the other end side of the expansion valve 142 is connected to one end side of the second chamber heat exchanger 172 by a pipe 103.
- the other end of the second indoor heat exchanger 172 is connected to the connection port 122 of the indoor unit 300 by a pipe 104.
- the two first chamber heat exchangers 171 and the second chamber heat exchanger 172 are connected in series, and the first chamber heat exchanger 171 and the first chamber heat exchanger 171 are connected in series.
- An expansion valve 142 is provided between the two chamber heat exchangers 172.
- the first indoor heat exchanger 171 is located on the windward side in the flow direction of the air taken into the indoor unit 300 from the indoor space by the fan 175.
- the second indoor heat exchanger 172 is located on the leeward side in the flow direction of the air taken into the indoor unit 300 from the indoor space by the fan 175.
- FIG. 3 is a diagram showing changes in the amount of heat exchanged in the first indoor heat exchanger 171 and the second indoor heat exchanger 172 with respect to the open / closed state of the expansion valve 142 for the air conditioner 100 according to the comparative example.
- the horizontal axis indicates the open / closed state of the expansion valve 142
- the vertical axis indicates the amount of heat exchanged in each of the first chamber heat exchanger 171 and the second chamber heat exchanger 172.
- the air conditioner 100 can control the temperature and humidity of the air blown from the indoor unit 300 into the indoor space by adjusting the opening degree of the expansion valve 142. As shown in FIG. 3, when the expansion valve 142 changes from the closed state to the open state, the exchange heat amount of the first chamber heat exchanger 171 increases, while the exchange heat amount of the second chamber heat exchanger 172 decreases. do.
- the opening state of the expansion valve 142 is the state P
- the amount of heat exchanged in the first room heat exchanger 171 and the amount of heat exchanged in the second room heat exchanger 172 are substantially the same.
- the state P is a state in which the expansion valve 142 is opened at an opening degree such that the exchange heat amount in the first chamber heat exchanger 171 and the exchange heat amount in the second chamber heat exchanger 172 are the same.
- the exchange heat amount in the second room heat exchanger 172 is larger than the exchange heat amount in the first room heat exchanger 171.
- FIGS. 4 and 5 are ph diagrams of the refrigeration cycle in the air conditioner 100 according to the comparative example.
- FIG. 4 shows a ph diagram when the expansion valve 142 of the indoor unit 300 is in the state P.
- FIG. 5 shows a ph diagram when the expansion valve 142 of the indoor unit 300 is in the state Q.
- the horizontal axis indicates the specific enthalpy, and the vertical axis indicates the pressure of the refrigerant.
- the change in the graph from the point a to the point b indicates the change in the state of the refrigerant in the compressor 10.
- the change in the graph from the point b to the point c indicates the change in the state of the refrigerant in the outdoor heat exchanger 30.
- the change in the graph from the point c to the point d indicates the change in the state of the refrigerant in the expansion valve 41.
- the change in the graph from the point d to the point e indicates the change in the state of the refrigerant in the first chamber heat exchanger 171.
- the change in the graph from point e to point f indicates a change in the state of the refrigerant in the expansion valve 142.
- the change in the graph from the point f to the point a indicates the change in the state of the refrigerant in the second chamber heat exchanger 172.
- the compressor 10 raises the pressure of the gas refrigerant by compressing the gas refrigerant flowing in from the indoor unit 3.
- the high-temperature and high-pressure gas refrigerant obtained by compression by the compressor 10 flows out to the outdoor heat exchanger 30.
- the outdoor heat exchanger 30 heats the high temperature and high pressure gas refrigerant flowing from the compressor 10 with the air taken in from the outdoor space by the fan 35. Have them exchanged.
- the high-temperature and high-pressure liquid refrigerant obtained by heat exchange by the outdoor heat exchanger 30 flows out to the expansion valve 142.
- the expansion valve 41 lowers the pressure of the high-temperature and high-pressure liquid refrigerant flowing in from the outdoor heat exchanger 30.
- the medium-temperature, medium-pressure, gas-liquid two-phase refrigerant obtained by decompression by the expansion valve 41 flows out to the indoor unit 300.
- the first indoor heat exchanger 171 takes in the gas-liquid two-phase state refrigerant flowing from the expansion valve 41 of the outdoor unit 2 from the indoor space by the fan 175. Heat is exchanged with the spilled air.
- the gas-liquid two-phase state refrigerant obtained by heat exchange by the first chamber heat exchanger 171 flows out to the expansion valve 142.
- the air taken into the indoor unit 300 from the indoor space is cooled within the range above the dew point temperature by heat exchange by the first indoor heat exchanger 171.
- the exchange of sensible heat that contributes to the temperature change of the air is mainly performed.
- the expansion valve 142 lowers the pressure of the medium-temperature medium-pressure gas-liquid two-phase state refrigerant flowing in from the first chamber heat exchanger 171.
- the refrigerant decompressed by the expansion valve 142 becomes a low-temperature low-pressure gas-liquid two-phase state refrigerant, and flows out to the second chamber heat exchanger 172.
- the gas-liquid two-phase state refrigerant flowing from the expansion valve 142 is heat-exchanged by the first chamber heat exchanger 171. Heat is exchanged with the air after it is used.
- the gas-liquid two-phase state refrigerant absorbed from the air by heat exchange by the second chamber heat exchanger 172 changes to a gas refrigerant.
- the low-temperature low-pressure gas refrigerant obtained by heat exchange by the second chamber heat exchanger 172 flows out to the compressor 10.
- the air taken into the indoor unit 300 from the indoor space is cooled to below the dew point temperature by heat exchange by the second indoor heat exchanger 172.
- the air taken into the indoor unit 300 is dehumidified and blown out into the indoor space again.
- the latent heat that contributes to the state change (dehumidification) of the moisture in the air is mainly exchanged.
- the amount of change in the specific enthalpy is substantially the same between the change in the graph from the point d to the point e and the change in the graph from the point f to the point a.
- the amount of heat exchanged in the second room heat exchanger 172 is larger than the amount of heat exchanged in the first room heat exchanger 171. Therefore, as shown in FIG. 5, the amount of change in the specific enthalpy is larger in the change in the graph from the point f to the point a than in the change in the graph from the point d to the point e.
- the expansion valve 142 when the expansion valve 142 is in the state Q, the expansion valve 142 is almost closed, so that the temperature of the refrigerant flowing through the second indoor heat exchanger 172 and the temperature of the air taken in from the indoor space There is no difference with. Therefore, in the first indoor heat exchanger 171, heat exchange is hardly performed between the refrigerant and the air taken in from the indoor space.
- FIG. 6 is a diagram showing changes in the SHF of air with respect to the open / closed state of the expansion valve 142 for the air conditioner 100 according to the comparative example.
- SHF Sud Heat Factor
- SHF is an index showing the air conditioning capacity of an air conditioner, and is also called a sensible heat ratio.
- SHF is represented by the ratio of sensible heat to the total heat consisting of the sum of sensible heat and latent heat.
- the horizontal axis indicates the open / closed state of the expansion valve 142
- the vertical axis indicates the SHF of the air passing through the indoor unit 300.
- the amount of heat exchanged in the heat exchanger 172 is approximately the same. Therefore, for the SHF of air, the ratio of sensible heat to total heat and the ratio of latent heat to total heat are substantially the same. For example, the value of SHF is about 0.5.
- the latent heat exchange is mainly performed in the second chamber heat exchanger 172 rather than the exchange heat amount in the first chamber heat exchanger 171 in which the sensible heat is mainly exchanged.
- the amount of heat exchange is larger. Therefore, for the SHF of air, the ratio of latent heat to total heat is larger than the ratio of sensible heat to total heat.
- the value of SHF will be less than about 0.5. Further, when heat exchange is hardly performed in the first chamber heat exchanger 171 as in this example, the value of SHF becomes close to 0.
- the air conditioner 100 mainly exchanges heat and latent heat in the first indoor heat exchanger 171 in which the apparent heat is mainly exchanged by adjusting the opening degree of the expansion valve 142. It is possible to control the heat exchange in the second indoor heat exchanger 172, thereby controlling the temperature and humidity of the air blown from the indoor unit 300 into the indoor space.
- FIG. 7 is a diagram showing changes in the amount of refrigerant staying in the indoor unit 300 with respect to the open / closed state of the expansion valve 142 for the air conditioner 100 according to the comparative example.
- the horizontal axis indicates the open / closed state of the expansion valve 142
- the vertical axis indicates the amount of refrigerant retained in each of the first chamber heat exchanger 171 and the second chamber heat exchanger 172.
- the amount of refrigerant staying in the indoor unit is larger when the expansion valve 142 is in the state Q than when the expansion valve 142 is in the state P.
- the expansion valve 142 hardly exchanges heat in the first room heat exchanger 171 as in the state Q, most of the liquid refrigerant stays in the first room heat exchanger 171.
- the air conditioner 100 according to the comparative example changes the amount of heat exchanged in each of the first chamber heat exchanger 171 and the second chamber heat exchanger 172, the first chamber heat exchanger 171 and the second chamber heat exchanger 171 and the second chamber.
- the amount of refrigerant flowing through each of the heat exchangers 172 cannot be adjusted to an appropriate amount.
- most of the liquid refrigerant stays in the first chamber heat exchanger 171 when the dehumidifying operation is performed so as to lower the SHF of the air.
- the air conditioner 1 according to the embodiment is configured to be able to control the temperature and humidity of the air blown into the indoor space while suppressing the cost.
- the air conditioner 1 according to the embodiment will be specifically described.
- FIG. 1 is a diagram showing a configuration of an air conditioner 1 according to an embodiment.
- FIG. 8 is a diagram showing the configuration of the indoor unit 3 according to the embodiment.
- the air conditioner 1 includes an indoor unit 3 connected to the outdoor unit 2 via the extension pipe 113 and the extension pipe 123.
- the indoor unit 3 includes a first indoor heat exchanger 71, a second indoor heat exchanger 72, a first expansion valve 42, a second expansion valve 43, and a fan 75.
- connection port 121 of the indoor unit 3 is connected to one end side of the first indoor heat exchanger 71 by the pipe 91 and the pipe 92.
- the other end side of the first chamber heat exchanger 71 is connected to one end side of the first expansion valve 42 by a pipe 93.
- the other end side of the first expansion valve 42 is connected to the connection port 122 of the indoor unit 3 by the pipe 94 and the pipe 98.
- connection port 121 of the indoor unit 3 is connected to one end side of the second expansion valve 43 by the pipe 91 and the pipe 95.
- the other end side of the second expansion valve 43 is connected to one end side of the second chamber heat exchanger 72 by a pipe 96.
- the other end side of the second indoor heat exchanger 72 is connected to the connection port 122 of the indoor unit 3 by the pipe 97 and the pipe 98.
- a first path including the pipes 92 to 94 and a second path including the pipes 95 to 97. are connected in parallel. That is, between the connection port 121 and the connection port 122, the two first room heat exchangers 71 and the second room heat exchanger 72 are connected in parallel.
- a first expansion valve 42 is provided between the first chamber heat exchanger 71 and the connection port 122.
- the first expansion valve 42 is an electronic expansion valve that opens and closes the valve based on the control of the control device 6 (control signal C2).
- a second expansion valve 43 is provided between the connection port 121 and the second chamber heat exchanger 72. In the cooling mode, the second expansion valve 43 is located on the upstream side in the flow direction of the refrigerant, and the second indoor heat exchanger 72 is located on the downstream side.
- the second expansion valve 43 is an electronic expansion valve that opens and closes the valve based on the control of the control device 6 (control signal C3).
- the air conditioner 1 further includes a temperature sensor 51, a temperature sensor 52, a temperature sensor 53, a temperature sensor 54, and a humidity sensor 55.
- the temperature sensor 51 measures the temperature of the refrigerant flowing between the expansion valve 41 and the connection port 112, and outputs the temperature T1 obtained by the measurement to the control device 6.
- the temperature sensor 52 measures the temperature of the refrigerant flowing between the second expansion valve 43 and the second indoor heat exchanger 72, and outputs the temperature T2 obtained by the measurement to the control device 6.
- the temperature sensor 53 measures the temperature of the refrigerant flowing between the first indoor heat exchanger 71 and the first expansion valve 42, and outputs the temperature T3 obtained by the measurement to the control device 6.
- the temperature sensor 54 measures the temperature of the refrigerant flowing between the connection port 111 and the compressor 10, and outputs the temperature T4 obtained by the measurement to the control device 6.
- the humidity sensor 55 measures the humidity of the air blown out from the indoor unit 3, and outputs the humidity H obtained by the measurement to the control device 6.
- the control device 6 controls the opening degree of the expansion valve 41 by outputting the control signal C1 to the expansion valve 41.
- the control device 6 controls the opening degree of the first expansion valve 42 by outputting the control signal C2 to the first expansion valve 42.
- the control device 6 controls the opening degree of the second expansion valve 43 by outputting the control signal C3 to the second expansion valve 43.
- FIG. 8 is a diagram showing the configuration of the indoor unit 3 according to the embodiment.
- the indoor unit 3 surrounds the fan 75 from the windward side to the leeward side in the flow direction of the air taken into the indoor unit 3, and has a first indoor heat exchanger 71 on the windward side.
- a second indoor heat exchanger 72 is provided on the leeward side.
- the first indoor heat exchanger 71 includes a plurality of indoor heat exchangers such as an indoor heat exchanger 71a, an indoor heat exchanger 71b, an indoor heat exchanger 71c, and an indoor heat exchanger 71d.
- the second indoor heat exchanger 72 includes a plurality of indoor heat exchangers such as an indoor heat exchanger 72a, an indoor heat exchanger 72b, an indoor heat exchanger 72c, and an indoor heat exchanger 72d.
- the air taken into the indoor unit 3 from the indoor space by the fan 75 passes through the first indoor heat exchanger 71 (indoor heat exchangers 71a to 71d) and then passes through the second indoor heat exchanger 72 (indoor heat exchanger 72a). After passing through ⁇ 71d), it is blown into the indoor space again.
- the indoor unit 3 shown in FIG. 8 is provided with a line flow fan (registered trademark) as the fan 75, it may be provided with an axial flow fan as the fan 75.
- the fan 75 may be arranged on the windward side of the first chamber heat exchanger 71 and the second chamber heat exchanger 72.
- FIG. 9 shows changes in the amount of heat exchanged in the first indoor heat exchanger 71 and the second indoor heat exchanger 72 with respect to the open / closed state of the first expansion valve 42 and the second expansion valve 43 for the air conditioner 1 according to the embodiment. It is a figure which shows.
- the horizontal axis indicates the open / closed state of the first expansion valve 42 and the second expansion valve 43
- the vertical axis indicates the amount of heat exchanged in each of the first indoor heat exchanger 71 and the second indoor heat exchanger 72. It is shown.
- the air conditioner 1 controls the temperature and humidity of the air blown from the indoor unit 3 into the indoor space by adjusting the opening degrees of each of the first expansion valve 42 and the second expansion valve 43. can do.
- the first expansion valve 42 changes from the closed state to the open state
- the second expansion valve 43 changes from the open state to the closed state
- the amount of heat exchanged in the first chamber heat exchanger 71 decreases.
- each of the first expansion valve 42 and the second expansion valve 43 is the state R
- the exchange heat amount in the first chamber heat exchanger 71 and the exchange heat amount in the second chamber heat exchanger 72 are It will be almost the same.
- the first expansion valve 42 and the second expansion valve 43 are opened at an opening degree such that the exchange heat amount in the first chamber heat exchanger 71 and the exchange heat amount in the second chamber heat exchanger 72 are the same. It can be said that it is in a state.
- the second chamber heat exchange is more than the exchange heat amount in the first chamber heat exchanger 71.
- the amount of heat exchanged in the vessel 72 is larger.
- FIG. 10 is a ph diagram of the refrigeration cycle in the air conditioner 1 according to the embodiment.
- a ph diagram is shown when the first expansion valve 42 and the second expansion valve 43 of the indoor unit 3 are in the state R or the state S.
- the horizontal axis indicates the specific enthalpy, and the vertical axis indicates the pressure of the refrigerant.
- the change in the graph from point A to point B indicates the change in the state of the refrigerant in the compressor 10.
- the change in the graph from point B to point C indicates a change in the state of the refrigerant in the outdoor heat exchanger 30.
- the change in the graph from point C to point D indicates a change in the state of the refrigerant in the expansion valve 41.
- the change in the graph from point D to point E1 indicates a change in the state of the refrigerant in the first chamber heat exchanger 71.
- the change in the graph from the point E1 to the point F1 indicates a change in the state of the refrigerant in the first expansion valve 42.
- the change in the graph from the point D to the point E2 indicates the change in the state of the refrigerant in the second expansion valve 43.
- the change in the graph from the point E2 to the point F2 indicates the change in the state of the refrigerant in the second chamber heat exchanger 72.
- the compressor 10 increases the pressure of the gas refrigerant by compressing the gas refrigerant flowing in from the indoor unit 3.
- the high-temperature and high-pressure gas refrigerant obtained by compression by the compressor 10 flows out to the outdoor heat exchanger 30.
- the outdoor heat exchanger 30 heats the high temperature and high pressure gas refrigerant flowing from the compressor 10 with the air taken in from the outdoor space by the fan 35. Have them exchanged.
- the high-temperature and high-pressure liquid refrigerant obtained by heat exchange by the outdoor heat exchanger 30 flows out to the expansion valve 142.
- the expansion valve 41 lowers the pressure of the high temperature and high pressure liquid refrigerant flowing from the outdoor heat exchanger 30.
- the medium-temperature, medium-pressure, gas-liquid two-phase refrigerant obtained by decompression by the expansion valve 41 flows out to the indoor unit 3.
- the first indoor heat exchanger 71 takes in the gas-liquid two-phase state refrigerant flowing from the expansion valve 41 of the outdoor unit 2 from the indoor space by the fan 75. Heat is exchanged with the spilled air.
- the gas-liquid two-phase state refrigerant absorbed from the air by heat exchange by the first chamber heat exchanger 71 changes to a gas refrigerant.
- the medium-temperature and medium-pressure gas refrigerant obtained by heat exchange by the first indoor heat exchanger 71 flows out to the first expansion valve 42.
- the air taken into the indoor unit 3 from the indoor space is cooled within the range above the dew point temperature by heat exchange by the first indoor heat exchanger 71.
- the exchange of sensible heat that contributes to the temperature change of the air is mainly performed.
- the first expansion valve 42 lowers the pressure of the medium-temperature and medium-pressure gas refrigerant flowing in from the first indoor heat exchanger 71.
- the refrigerant decompressed by the first expansion valve 42 becomes a low-temperature low-pressure gas refrigerant and flows out to the compressor 10.
- the second expansion valve 43 lowers the pressure of the gas-liquid two-phase state refrigerant flowing in from the expansion valve 41 of the outdoor unit 2.
- the refrigerant decompressed by the second expansion valve 43 becomes a low-temperature low-pressure gas-liquid two-phase state refrigerant and flows out to the second chamber heat exchanger 72.
- the second chamber heat exchanger 72 heats the gas-liquid two-phase state refrigerant flowing from the second expansion valve 43 by the first chamber heat exchanger 71. Heat is exchanged with the air after it has been exchanged.
- the gas-liquid two-phase state refrigerant absorbed from the air by heat exchange by the second indoor heat exchanger 72 changes to a gas refrigerant.
- the low-temperature low-pressure gas refrigerant obtained by heat exchange by the second chamber heat exchanger 72 flows out to the compressor 10.
- the air taken into the indoor unit 3 from the indoor space is cooled to less than the dew point temperature by heat exchange by the second indoor heat exchanger 72.
- the air taken into the indoor unit 3 is dehumidified and blown out into the indoor space again.
- the latent heat that contributes to the state change (dehumidification) of the moisture in the air is mainly exchanged.
- FIG. 11 is a diagram showing changes in the SHF of air with respect to the open / closed state of the first expansion valve 42 and the second expansion valve 43 for the air conditioner 1 according to the embodiment.
- the horizontal axis indicates the open / closed state of the first expansion valve 42 and the second expansion valve 43
- the vertical axis indicates the SHF of the air flowing through the indoor unit 3.
- the exchange heat amount and the latent heat exchange in the first chamber heat exchanger 71 in which the sensible heat exchange is mainly performed is substantially the same as the amount of heat exchanged in the second chamber heat exchanger 72, which is mainly performed. Therefore, for the SHF of air, the ratio of sensible heat to total heat and the ratio of latent heat to total heat are substantially the same. For example, the value of SHF is about 0.5.
- the latent heat is mainly exchanged rather than the exchanged heat amount in the first indoor heat exchanger 71 where the sensible heat is mainly exchanged.
- the amount of heat exchanged in the second chamber heat exchanger 72 is larger. Therefore, for the SHF of air, the ratio of latent heat to total heat is larger than the ratio of sensible heat to total heat.
- the value of SHF will be less than 0.5. Further, when heat exchange is hardly performed in the first chamber heat exchanger 71 as in this example, the value of SHF becomes close to 0.
- the air conditioner 1 adjusts the opening degree of each of the first expansion valve 42 and the second expansion valve 43 to heat in the first chamber heat exchanger 71 in which the apparent heat is mainly exchanged. It is possible to control the exchange and the heat exchange in the second indoor heat exchanger 72 where the exchange of latent heat is mainly performed, thereby controlling the temperature and humidity of the air blown from the indoor unit 3 into the indoor space. can do.
- FIG. 12 is a diagram showing changes in the amount of refrigerant staying in the indoor unit 3 with respect to the open / closed state of the first expansion valve 42 and the second expansion valve 43 for the air conditioner 1 according to the embodiment.
- the horizontal axis indicates the open / closed state of the first expansion valve 42 and the second expansion valve 43
- the vertical axis indicates the refrigerant staying in each of the first chamber heat exchanger 71 and the second chamber heat exchanger 72. The amount is shown.
- the indoor unit 3 is in the case where the first expansion valve 42 and the second expansion valve 43 are in the state S and the case where the first expansion valve 42 and the second expansion valve 43 are in the state S.
- the amount of refrigerant staying inside is substantially the same.
- the first expansion valve 42 and the second expansion valve 43 are in the state S, they stay in the first indoor heat exchanger 71 more than when the first expansion valve 42 and the second expansion valve 43 are in the state R.
- the amount of refrigerant to be used decreases.
- the amount of refrigerant staying in the first indoor heat exchanger 171 of the air conditioner 100 according to the comparative example is also shown, but the first indoor heat exchanger 71 of the air conditioner 1 according to the embodiment is also shown. Can reduce the amount of refrigerant staying in the first chamber heat exchanger 171 of the air conditioner 100 according to the comparative example.
- the air conditioner 1 when the amount of heat exchanged in each of the first chamber heat exchanger 71 and the second chamber heat exchanger 72 is changed, the first chamber heat exchanger 71 and the second chamber heat exchanger 71 and the second chamber heat exchanger 72 are changed.
- the amount of refrigerant flowing through each of the indoor heat exchangers 72 can be adjusted to an appropriate amount.
- the air conditioner 1 according to the embodiment uses as much refrigerant as possible to stay in the first chamber heat exchanger 71 and the second chamber heat exchanger 72 even when the dehumidifying operation is performed so as to lower the SHF of the air. Can be reduced.
- the air conditioner 1 does not need to pre-fill the refrigerant circuit with an amount of refrigerant assuming a stagnant amount, and the temperature and humidity of the air blown out into the indoor space while suppressing the cost. Can be controlled.
- FIG. 13 is a flowchart for explaining the process executed by the control device 6 in the air conditioner 1 according to the embodiment.
- the control device 6 executes the processing of the flowchart shown in FIG. 13 by executing the control program stored in the memory 62.
- the processing of this flowchart is called and executed from the main control routine of the air conditioner 1 at regular intervals.
- "S" is used as an abbreviation for "STEP".
- the control device 6 determines whether or not the humidity H of the air blown from the indoor unit 3 acquired from the humidity sensor 55 is larger than the set value h (S1). When the humidity H is equal to or less than the set value h (NO in S1), the control device 6 reduces the opening degree of the expansion valve 41 of the outdoor unit 2 (S2). As a result, the air conditioner 1 can appropriately dehumidify by reducing the amount of the refrigerant flowing in the indoor unit 3 and suppressing the dehumidification in the indoor unit 3.
- the control device 6 increases the opening degree of the expansion valve 41 of the outdoor unit 2 (S3).
- the air conditioner 1 can appropriately dehumidify the indoor unit 3 by increasing the amount of the refrigerant flowing through the indoor unit 3 and promoting the dehumidification of the indoor unit 3.
- the control device 6 includes the temperature T3 of the refrigerant flowing between the first indoor heat exchanger 71 and the first expansion valve 42 acquired from the temperature sensor 53, and the expansion valve 41 and the connection port 112 acquired from the temperature sensor 51.
- the temperature difference A from the temperature T1 of the refrigerant flowing between them is calculated (S4).
- the control device 6 determines whether or not the calculated temperature difference A is larger than the set value a (S5). When the temperature difference A is equal to or less than the set value a (NO in S5), the control device 6 reduces the opening degree of the first expansion valve 42 (S6). As a result, the air conditioner 1 can reduce the amount of refrigerant flowing through the first chamber heat exchanger 71 and allow the first chamber heat exchanger 71 to appropriately exchange heat.
- the control device 6 increases the opening degree of the first expansion valve 42 (S7). For example, when the temperature T3 of the refrigerant flowing between the first chamber heat exchanger 71 and the first expansion valve 42 is excessively higher than the temperature T1 of the refrigerant flowing between the expansion valve 41 and the connection port 112. , There is a possibility that excessive heat exchange is performed in the first chamber heat exchanger 71. Therefore, the control device 6 increases the amount of refrigerant flowing through the first chamber heat exchanger 71 by increasing the opening degree of the first expansion valve 42. As a result, the air conditioner 1 can appropriately exchange heat in the first indoor heat exchanger 71, and can keep the degree of superheat at the outlet of the first indoor heat exchanger 71 constant.
- the control device 6 includes a temperature T4 of the refrigerant flowing between the connection port 111 acquired from the temperature sensor 54 and the compressor 10, a second expansion valve 43 acquired from the temperature sensor 52, and a second indoor heat exchanger 72.
- the temperature difference B from the temperature T2 of the refrigerant flowing between them is calculated (S8).
- the control device 6 determines whether or not the calculated temperature difference B is larger than the set value b (S9). When the temperature difference B is equal to or less than the set value b (NO in S9), the control device 6 reduces the opening degree of the second expansion valve 43 (S10). For example, the difference between the temperature T4 of the refrigerant flowing between the connection port 111 and the compressor 10 and the temperature T2 of the refrigerant flowing between the second expansion valve 43 and the second indoor heat exchanger 72 is excessive. If it is small, the heat exchange may be insufficient and the liquid refrigerant may flow out to the compressor 10. Therefore, the control device 6 reduces the amount of refrigerant flowing through the second chamber heat exchanger 72 by reducing the opening degree of the first expansion valve 42. As a result, the air conditioner 1 can appropriately exchange heat in the second indoor heat exchanger 72, and can prevent the liquid refrigerant from flowing out to the compressor 10 as much as possible.
- the control device 6 increases the opening degree of the second expansion valve 43 (S11). As a result, the air conditioner 1 can increase the amount of refrigerant flowing through the second chamber heat exchanger 72 so that the second chamber heat exchanger 72 can appropriately exchange heat. After processing S10 or S11, the controller 6 returns control to the main control routine.
- the air conditioner 1 controls each of the expansion valve 41, the first expansion valve 42, and the second expansion valve 43 to control the refrigerant and the air taken in from the indoor space in the indoor unit 3. It is possible to appropriately adjust the temperature and humidity of the air blown into the indoor space while efficiently exchanging heat with the air conditioner.
- the present disclosure relates to an air conditioner 1.
- the air conditioner 1 includes an outdoor unit 2 and an indoor unit 3.
- the indoor unit 3 has a connection port 121 connected to the outdoor unit 2 and configured to allow the refrigerant to flow, and a connection port 122 connected to the outdoor unit 2 and configured to allow the refrigerant to flow.
- the first path including the pipes 92 to 94 provided between the connection port 121 and the connection port 122, and the pipe provided between the connection port 121 and the connection port 122 in parallel with the pipes 92 to 94.
- a second path including the pipes 97 to 95, a first chamber heat exchanger 71 provided in the first path, and a second chamber heat exchanger 71 and a connection port 122 in the first path.
- Expansion valve 42 a second indoor heat exchanger 72 provided in the second path, and a second expansion valve 43 provided between the second indoor heat exchanger 72 and the connection port 121 in the second path. Equipped with.
- the first indoor heat exchanger 71 is located on the windward side in the flow direction of the air taken into the indoor unit 3.
- the second indoor heat exchanger 72 is located on the leeward side in the flow direction of the air taken into the indoor unit.
- the air conditioner 1 changes the exchange heat amount in each of the first chamber heat exchanger 71 and the second chamber heat exchanger 72
- the first chamber heat exchanger 71 and the second chamber heat exchanger 71 and the second chamber heat exchanger 72 are provided. Since the amount of the refrigerant flowing through each of the indoor heat exchangers 72 can be adjusted to an appropriate amount, it is not necessary to pre-fill the refrigerant circuit with the amount of the accumulated amount of the refrigerant, and the indoor heat exchanger 72 can be kept at a low cost. It is possible to control the temperature and humidity of the air blown into the space.
- the air conditioner 1 further includes a control device 6 for controlling the first expansion valve 42 and the second expansion valve 43.
- the air conditioner 1 is taken in from the refrigerant and the indoor space in the indoor unit 3 by adjusting the opening degree of each of the first expansion valve 42 and the second expansion valve 43. It is possible to appropriately adjust the temperature and humidity of the air blown into the indoor space while efficiently exchanging heat with the air.
- the outdoor unit 2 is arranged in order from the connection port 112 connected to the connection port 121, the connection port 111 connected to the connection port 122, and the connection port 111 to the connection port 112. It is provided with an outdoor heat exchanger 30 and an expansion valve 41.
- the control device 6 further controls the expansion valve 41.
- the air conditioner 1 can adjust the amount of the refrigerant flowing through the indoor unit 3 by adjusting the opening degree of the expansion valve 41, whereby the efficiency of the indoor unit 3 can be adjusted. Heat exchange can be performed well.
- control device controls the expansion valve 41 based on the humidity of the air blown out from the indoor unit 3, as shown in S1 to S3 of FIG.
- the air conditioner 1 adjusts the amount of the refrigerant flowing to the indoor unit 3 by adjusting the opening degree of the expansion valve 41 based on the humidity of the air blown from the indoor unit 3. This makes it possible to appropriately dehumidify the indoor unit 3.
- control device has a first expansion based on the temperature of the refrigerant flowing out of the first chamber heat exchanger 71 and the temperature of the refrigerant flowing out of the expansion valve 41, as shown in S4 to S7 of FIG. Controls the valve 42.
- the air conditioner 1 can adjust the amount of the refrigerant flowing to the first chamber heat exchanger 71 by adjusting the opening degree of the first expansion valve 42, whereby the amount of the refrigerant flows to the first chamber heat exchanger 71 can be adjusted.
- the first chamber heat exchanger 71 can appropriately perform heat exchange.
- control device has a second expansion valve 43 based on the temperature of the refrigerant flowing into the compressor 10 and the temperature of the refrigerant flowing out of the second expansion valve 43, as shown in S8 to S11 of FIG. To control.
- the air conditioner 1 can adjust the amount of the refrigerant flowing to the second indoor heat exchanger 72 by adjusting the opening degree of the second expansion valve 43, whereby the amount of the refrigerant flows to the second chamber heat exchanger 72 can be adjusted.
- the second chamber heat exchanger 72 can appropriately perform heat exchange.
- the present disclosure relates to the indoor unit 3 of the air conditioner 1 in other aspects.
- the indoor unit 3 has a connection port 121 connected to the outdoor unit 2 and configured to allow the refrigerant to flow, and a connection port 122 connected to the outdoor unit 2 and configured to allow the refrigerant to flow.
- the first path including the pipes 92 to 94 provided between the connection port 121 and the connection port 122, and the pipe provided between the connection port 121 and the connection port 122 in parallel with the pipes 92 to 94.
- a second path including the pipes 97 to 95, a first chamber heat exchanger 71 provided in the first path, and a second chamber heat exchanger 71 and a connection port 122 in the first path.
- Expansion valve 42 a second indoor heat exchanger 72 provided in the second path, and a second expansion valve 43 provided between the second indoor heat exchanger 72 and the connection port 121 in the second path. Equipped with.
- the first indoor heat exchanger 71 is located on the windward side in the flow direction of the air taken into the indoor unit 3.
- the second indoor heat exchanger 72 is located on the leeward side in the flow direction of the air taken into the indoor unit.
- the indoor unit 3 when the indoor unit 3 changes the amount of heat exchanged in each of the first indoor heat exchanger 71 and the second indoor heat exchanger 72, the indoor unit 3 has the first indoor heat exchanger 71 and the second indoor heat exchanger 71. Since the amount of the refrigerant flowing in each of the heat exchangers 72 can be adjusted to an appropriate amount, it is not necessary to preliminarily fill the refrigerant circuit with the amount of the refrigerant assuming the accumulated amount, and the indoor space can be suppressed while suppressing the cost. It is possible to control the temperature and humidity of the air blown out to.
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Abstract
Description
図1を参照しながら、空気調和機の概要について説明する。図1は、実施の形態に係る空気調和機1の構成を示す図である。なお、図1では、空気調和機1における各部の接続関係および配置構成を機能的に示しており、物理的な空間における配置を必ずしも示すものではない。
図2を参照しながら、比較例に係る空気調和機100について説明する。図2は、比較例に係る空気調和機100の構成を示す図である。なお、図2では、空気調和機100が備える構成のうち、上述した実施の形態に係る空気調和機1が備える構成と同じ機能を有するものについては、実施の形態に係る空気調和機1が備える構成と同じ符号を付しており、以下では、その詳細な説明は省略する。
図3~図7を参照しながら、比較例に係る空気調和機100による空気の温度および湿度の制御について説明する。
図1および図8を参照しながら、実施の形態に係る空気調和機1について説明する。図1は、実施の形態に係る空気調和機1の構成を示す図である。図8は、実施の形態に係る室内機3の構成を示す図である。
図9~図13を参照しながら、実施の形態に係る空気調和機1による空気の温度および湿度の制御について説明する。
本開示は、空気調和機1に関する。空気調和機1は、室外機2と、室内機3とを備える。室内機3は、室外機2に接続され、かつ、冷媒が流通するように構成された接続口121と、室外機2に接続され、かつ、冷媒が流通するように構成された接続口122と、接続口121と接続口122との間に設けられた配管92~配管94を含む第1経路と、配管92~配管94と並列に接続口121と接続口122との間に設けられた配管95~配管97を含む第2経路と、第1経路に設けられた第1室内熱交換器71と、第1経路における第1室内熱交換器71と接続口122との間に設けられた第1膨張弁42と、第2経路に設けられた第2室内熱交換器72と、第2経路における第2室内熱交換器72と接続口121との間に設けられた第2膨張弁43とを備える。第1室内熱交換器71は、室内機3に取り込まれた空気の流れ方向における風上側に位置する。第2室内熱交換器72は、室内機に取り込まれた空気の流れ方向における風下側に位置する。
Claims (7)
- 空気調和機であって、
室外機と、
室内機とを備え、
前記室内機は、
前記室外機に接続され、かつ、冷媒が流通するように構成された第1接続口と、
前記室外機に接続され、かつ、冷媒が流通するように構成された第2接続口と、
前記第1接続口と前記第2接続口との間に設けられた第1経路と、
前記第1経路と並列に前記第1接続口と前記第2接続口との間に設けられた第2経路と、
前記第1経路に設けられた第1室内熱交換器と、
前記第1経路における前記第1室内熱交換器と前記第2接続口との間に設けられた第1膨張弁と、
前記第2経路に設けられた第2室内熱交換器と、
前記第2経路における前記第2室内熱交換器と前記第1接続口との間に設けられた第2膨張弁とを備え、
前記第1室内熱交換器は、前記室内機に取り込まれた空気の流れ方向における風上側に位置し、
前記第2室内熱交換器は、前記室内機に取り込まれた空気の流れ方向における風下側に位置する、空気調和機。 - 前記第1膨張弁および前記第2膨張弁を制御する制御装置をさらに備える、請求項1に記載の空気調和機。
- 前記室外機は、
前記第1接続口に接続される第3接続口と、
前記第2接続口に接続される第4接続口と、
前記第4接続口から前記第3接続口へと順に配置される、圧縮機、室外熱交換器、および第3膨張弁とを備え、
前記制御装置は、前記第3膨張弁をさらに制御する、請求項2に記載の空気調和機。 - 前記制御装置は、前記室内機から吹き出される前記空気の湿度に基づき、前記第3膨張弁を制御する、請求項3に記載の空気調和機。
- 前記制御装置は、前記第1室内熱交換器から流出する冷媒の温度と、前記第3膨張弁から流出する冷媒の温度とに基づき、前記第1膨張弁を制御する、請求項3に記載の空気調和機。
- 前記制御装置は、前記圧縮機に流入する冷媒の温度と、前記第2膨張弁から流出する冷媒の温度とに基づき、前記第2膨張弁を制御する、請求項3に記載の空気調和機。
- 空気調和機の室内機であって、
室外機に接続され、かつ、冷媒が流通するように構成された第1接続口と、
前記室外機に接続され、かつ、冷媒が流通するように構成された第2接続口と、
前記第1接続口と前記第2接続口との間に設けられた第1経路と、
前記第1経路と並列に前記第1接続口と前記第2接続口との間に設けられた第2経路と、
前記第1経路に設けられた第1室内熱交換器と、
前記第1経路における前記第1室内熱交換器と前記第2接続口との間に設けられた第1膨張弁と、
前記第2経路に設けられた第2室内熱交換器と、
前記第2経路における前記第2室内熱交換器と前記第1接続口との間に設けられた第2膨張弁とを備え、
前記第1室内熱交換器は、前記室内機に取り込まれた空気の流れ方向における風上側に位置し、
前記第2室内熱交換器は、前記室内機に取り込まれた空気の流れ方向における風下側に位置する、室内機。
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JPH03164666A (ja) * | 1989-11-24 | 1991-07-16 | Hitachi Ltd | 空気調和装置 |
JP2001082761A (ja) | 1999-09-14 | 2001-03-30 | Mitsubishi Electric Corp | 空気調和機 |
JP2006064257A (ja) * | 2004-08-26 | 2006-03-09 | Daikin Ind Ltd | 空調室内機および冷凍装置 |
JP2007132560A (ja) * | 2005-11-09 | 2007-05-31 | Toshiba Kyaria Kk | 空気調和機 |
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KR101443645B1 (ko) * | 2012-02-07 | 2014-09-23 | 엘지전자 주식회사 | 전기자동차용 공기조화장치 |
JP5831661B1 (ja) * | 2014-09-30 | 2015-12-09 | ダイキン工業株式会社 | 空調機 |
WO2018037545A1 (ja) * | 2016-08-25 | 2018-03-01 | 三菱電機株式会社 | 空気調和装置、空気調和方法及びプログラム |
JP2018204814A (ja) * | 2017-05-31 | 2018-12-27 | 三菱重工サーマルシステムズ株式会社 | 制御装置、それを備えたマルチ型空気調和システム、及び制御方法並びに制御プログラム |
JP6869370B2 (ja) * | 2017-11-22 | 2021-05-12 | 三菱電機株式会社 | 空調機 |
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Patent Citations (4)
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JPH03164666A (ja) * | 1989-11-24 | 1991-07-16 | Hitachi Ltd | 空気調和装置 |
JP2001082761A (ja) | 1999-09-14 | 2001-03-30 | Mitsubishi Electric Corp | 空気調和機 |
JP2006064257A (ja) * | 2004-08-26 | 2006-03-09 | Daikin Ind Ltd | 空調室内機および冷凍装置 |
JP2007132560A (ja) * | 2005-11-09 | 2007-05-31 | Toshiba Kyaria Kk | 空気調和機 |
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JP7466704B2 (ja) | 2024-04-12 |
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