WO2022210796A1 - Refrigeration cycle device - Google Patents
Refrigeration cycle device Download PDFInfo
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- WO2022210796A1 WO2022210796A1 PCT/JP2022/015713 JP2022015713W WO2022210796A1 WO 2022210796 A1 WO2022210796 A1 WO 2022210796A1 JP 2022015713 W JP2022015713 W JP 2022015713W WO 2022210796 A1 WO2022210796 A1 WO 2022210796A1
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- Prior art keywords
- refrigerant
- refrigeration cycle
- mode
- composition ratio
- compressor
- Prior art date
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 156
- 239000003507 refrigerant Substances 0.000 claims abstract description 634
- 239000000203 mixture Substances 0.000 claims abstract description 119
- 230000008859 change Effects 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims description 23
- 238000009835 boiling Methods 0.000 claims description 20
- 230000007246 mechanism Effects 0.000 description 48
- 238000010438 heat treatment Methods 0.000 description 26
- 239000007788 liquid Substances 0.000 description 25
- 238000001816 cooling Methods 0.000 description 22
- 238000000034 method Methods 0.000 description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 17
- 230000006870 function Effects 0.000 description 16
- 239000003463 adsorbent Substances 0.000 description 15
- 230000007423 decrease Effects 0.000 description 14
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 8
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- 238000010586 diagram Methods 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 239000012621 metal-organic framework Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- WFLOTYSKFUPZQB-OWOJBTEDSA-N (e)-1,2-difluoroethene Chemical group F\C=C\F WFLOTYSKFUPZQB-OWOJBTEDSA-N 0.000 description 1
- CDOOAUSHHFGWSA-UPHRSURJSA-N (z)-1,3,3,3-tetrafluoroprop-1-ene Chemical compound F\C=C/C(F)(F)F CDOOAUSHHFGWSA-UPHRSURJSA-N 0.000 description 1
- MIZLGWKEZAPEFJ-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical group FC=C(F)F MIZLGWKEZAPEFJ-UHFFFAOYSA-N 0.000 description 1
- FXRLMCRCYDHQFW-UHFFFAOYSA-N 2,3,3,3-tetrafluoropropene Chemical compound FC(=C)C(F)(F)F FXRLMCRCYDHQFW-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
-
- 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
-
- 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0253—Compressor control by controlling speed with variable speed
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2523—Receiver 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
-
- 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
- F25B2700/19—Pressures
-
- 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
- F25B2700/2108—Temperatures of a receiver
Definitions
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 2008-281326 describes the use of R1234yf, which has a low global warming potential, in a refrigeration cycle device instead of R134a.
- a refrigerating cycle device includes a refrigerating cycle, a changing section, and a control section.
- the refrigeration cycle uses a non-azeotropic refrigerant mixture containing a first refrigerant and a second refrigerant.
- the changing unit changes the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the refrigeration cycle.
- the control unit controls the operation of the change unit.
- the controller executes a first mode and a second mode.
- the first mode is a mode in which the operation of the change unit is controlled to allow the second refrigerant to flow substantially independently through the refrigeration cycle.
- the second mode is a mode in which the operation of the change unit is controlled to allow the mixed refrigerant of the first refrigerant and the second refrigerant to flow through the refrigeration cycle.
- the refrigeration cycle device of the first aspect can use the second refrigerant substantially alone, or can use a non-azeotropic mixed refrigerant containing the first refrigerant and the second refrigerant. Therefore, a refrigerant of suitable composition can be used.
- the refrigerating cycle device is the refrigerating cycle device according to the first aspect, and in the first mode, a refrigerant having a second refrigerant concentration of 92 wt % or more is flowed through the refrigerating cycle.
- the refrigerating cycle device is the refrigerating cycle device according to the second aspect, and in the first mode, a refrigerant having a second refrigerant concentration of 98 wt % or higher is flowed through the refrigerating cycle.
- a refrigeration cycle apparatus is the refrigeration cycle apparatus according to any one of the first to third aspects, and further includes a detection unit.
- the detection unit detects the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the refrigeration cycle.
- the control unit controls the operation of the changing unit so that the composition ratio of the first refrigerant and the second refrigerant detected by the detection unit becomes the target composition ratio.
- the composition ratio between the first refrigerant and the second refrigerant is changed while detecting the composition ratio of the refrigerant, so refrigerant with an appropriate composition can be used according to the operating conditions.
- a refrigeration cycle device is the refrigeration cycle device according to any one of the first to fourth aspects, wherein the boiling point of the second refrigerant is higher than the boiling point of the first refrigerant.
- the refrigerating cycle device is the refrigerating cycle device according to the fifth aspect, and the refrigerating cycle includes a utilization heat exchanger that adjusts the temperature of an object to be temperature-adjusted.
- the control unit executes the first mode.
- the control unit executes the second mode.
- the second refrigerant when used as an evaporator, the second refrigerant can be used almost exclusively to operate with an emphasis on efficiency.
- the required capacity when the heat exchanger is used as a heat radiator, the required capacity can be obtained by using the non-azeotropic mixed refrigerant of the first refrigerant and the second refrigerant.
- a refrigerating cycle apparatus is the refrigerating cycle apparatus according to the sixth aspect, wherein when the utilization heat exchanger is used as a heat radiator, the controller controls the first mode or the second mode.
- the second refrigerant may be used if it is unnecessary to use the mixed refrigerant of the first refrigerant and the second refrigerant due to the capacity. It can be used almost independently to drive with an emphasis on efficiency.
- a refrigeration cycle device is the refrigeration cycle device according to the seventh aspect, and the refrigeration cycle includes a compressor.
- the controller further controls the rotation speed of the compressor.
- the control unit executes the second mode when the required capacity cannot be obtained even if the rotational speed of the compressor is increased to a predetermined rotational speed while the first mode is being executed.
- a refrigerating cycle apparatus is the refrigerating cycle apparatus according to the sixth aspect or the seventh aspect, wherein the control unit controls the operation of the changing unit when executing the second mode to operate the refrigerating cycle.
- the composition ratio of the first refrigerant and the second refrigerant in the flowing refrigerant is changed between the first composition ratio and the second composition ratio.
- the second composition ratio has a higher proportion of the first refrigerant than the first composition ratio.
- the composition ratio between the first refrigerant and the second refrigerant is changed in stages, so that the necessary capacity can be obtained while suppressing the decrease in efficiency.
- a refrigeration cycle device is the refrigeration cycle device according to the ninth aspect, and the refrigeration cycle includes a compressor.
- the controller further controls the rotation speed of the compressor.
- the control unit changes either the number of rotations of the compressor or the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the refrigeration cycle according to changes in the required capacity of the refrigeration cycle device.
- a refrigerating cycle device is the refrigerating cycle device according to the tenth aspect, wherein, when the required capacity increases, the control unit controls the rotation speed of the compressor and the first Of the composition ratios of the refrigerant and the second refrigerant, the one with the smaller amount of increase in the electric power of the compressor when changed is changed.
- a refrigerating cycle device is the refrigerating cycle device according to the tenth or eleventh aspect, wherein the controller controls, when the required capacity is reduced, the ratio of the first refrigerant in the refrigerant flowing through the refrigerating cycle to When the ratio is higher than the predetermined value, the changing unit is controlled to decrease the ratio of the first refrigerant in the refrigerant flowing through the refrigerating cycle, and when the ratio of the first refrigerant in the refrigerant flowing through the refrigerating cycle is equal to or less than the predetermined value, Decrease compressor speed.
- a refrigeration cycle device is the refrigeration cycle device according to any one of the first to twelfth aspects, and the first refrigerant is CO2.
- the second refrigerant is R1234Ze or R1234yf.
- a refrigeration cycle device is the refrigeration cycle device according to any one of the first to twelfth aspects, and the first refrigerant is R1132(E) or R1123.
- the second refrigerant is R1234Ze or R1234yf.
- FIG. 1 is a schematic configuration diagram of a refrigeration cycle apparatus according to one embodiment
- 2 is a schematic configuration diagram of a refrigeration cycle apparatus according to Modification A
- FIG. 11 is a schematic configuration diagram of a refrigeration cycle apparatus according to Modification G;
- a refrigeration cycle device is a device that uses a vapor compression refrigeration cycle to perform at least one of cooling of a temperature-adjusted object and heating of a temperature-adjusted object.
- the refrigeration cycle device of the present disclosure uses a non-azeotropic mixed refrigerant as a refrigerant.
- the refrigeration cycle device of the present disclosure changes the composition ratio of the refrigerant flowing through the refrigeration cycle according to conditions, as described later.
- FIG. 1 is a schematic configuration diagram of a refrigeration cycle apparatus 100. As shown in FIG. 1
- the refrigeration cycle device 100 is an air conditioner that cools and heats the air whose temperature is to be adjusted.
- the refrigeration cycle device 100 is not limited to this, and may be a device that cools and heats a liquid (for example, water) whose temperature is to be adjusted.
- the refrigerating cycle device 100 mainly includes a main refrigerant circuit 50 as an example of a refrigerating cycle, a changing section 70, a detecting section 150, and a controller 110, as shown in FIG.
- the refrigerant circuit 200 includes the main refrigerant circuit 50 and a first bypass flow path 80 of a change section 70 (to be described later) connected to the main refrigerant circuit 50 .
- the refrigerant circuit 200 is filled with a non-azeotropic refrigerant mixture.
- the main refrigerant circuit 50 uses a non-azeotropic refrigerant mixture.
- a non-azeotropic refrigerant mixture is a mixture of at least two refrigerants.
- the refrigerant circuit 200 of the refrigeration cycle apparatus 100 of the first embodiment is filled with a non-azeotropic mixed refrigerant containing only two types of refrigerants (first refrigerant and second refrigerant).
- first refrigerant and second refrigerant first refrigerant and second refrigerant
- the non-azeotropic refrigerant mixture may be a mixture of three or more refrigerants.
- the second refrigerant may be an azeotropic or pseudo-azeotropic refrigerant mixture containing two or more refrigerants instead of one refrigerant.
- the non-azeotropic mixed refrigerant is a mixed refrigerant of an azeotropic or pseudo-azeotropic mixed refrigerant containing two or more refrigerants as a second refrigerant and a first refrigerant that is non-azeotropic with the second refrigerant. Even though.
- the first refrigerant is CO2 (carbon dioxide) and the second refrigerant is HFO (hydrofluoroolefin).
- HFO is a refrigerant with a very low global warming potential.
- a specific non-limiting example of HFO for use as the second refrigerant is R1234Ze (cis-1,3,3,3-tetrafluoropropene).
- R1234yf (2,3,3,3-tetrafluoropropene) may be used as HFO of the second refrigerant.
- CO2 is a refrigerant with a relatively low boiling point
- R1234Ze and R1234yf are refrigerants with a relatively high boiling point.
- the boiling point of the second refrigerant is higher than the boiling point of the first refrigerant.
- the first refrigerant may be called a low boiling point refrigerant
- the second refrigerant may be called a high boiling point refrigerant.
- the ratio of the total weight of the first refrigerant charged in the refrigerant circuit 200 to the total weight of all refrigerants charged in the refrigerant circuit 200 of the refrigeration cycle device 100 is preferably 20 wt% or less.
- the main refrigerant circuit 50, the changing section 70, the detecting section 150 and the controller 110 will be outlined.
- the main refrigerant circuit 50 mainly includes a compressor 10, a flow path switching mechanism 15, a heat source heat exchanger 20, an expansion mechanism 30, and a utilization heat exchanger 40, as shown in FIG.
- the compressor 10, the flow path switching mechanism 15, the heat source heat exchanger 20, the expansion mechanism 30, and the utilization heat exchanger 40 are connected by refrigerant pipes 52a to 52e, which will be described later, to form a main refrigerant circuit 50. (See Figure 1).
- the refrigeration cycle device 100 circulates the refrigerant in the main refrigerant circuit 50 to cool and heat the air whose temperature is to be adjusted.
- the changing unit 70 is a mechanism that changes the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 .
- the detection unit 150 detects the composition ratio of the refrigerant circulating in the main refrigerant circuit 50 .
- the refrigeration cycle apparatus 100 has a heat source unit 2 having a casing (not shown) and a utilization unit connected to the heat source unit 2 via a refrigerant pipe. 4 and .
- the heat source unit 2 is installed, for example, on the roof of the building in which the refrigerating cycle device 100 is installed, in a machine room, or around the building in which the refrigerating cycle device 100 is installed.
- the usage unit 4 is arranged in a space to be air-conditioned or in a space near the space to be air-conditioned (for example, in the ceiling or in a machine room).
- the casing of the heat source unit 2 includes the compressor 10 of the main refrigerant circuit 50, the flow path switching mechanism 15, the heat source heat exchanger 20, the expansion mechanism 30, the changing section 70, and the detecting section 150. , are mainly accommodated.
- the casing of the utilization unit 4 mainly accommodates the utilization heat exchanger 40 of the main refrigerant circuit 50 .
- the controller 110 controls operations of various components of the refrigeration cycle apparatus 100 .
- the controller 110 controls the operation of the changing unit 70.
- the controller 110 executes the first mode and the second mode by controlling the operation of the changing section 70 .
- the first mode is a mode in which the operation of the changing unit 70 is controlled to allow the second refrigerant to flow through the main refrigerant circuit 50 substantially independently.
- the second mode is a mode in which the operation of the changing unit 70 is controlled to allow the mixed refrigerant of the first refrigerant and the second refrigerant to flow through the main refrigerant circuit 50 .
- the flow of the second refrigerant substantially alone is not limited to the state of flowing the second refrigerant that does not contain the first refrigerant, but the state of flowing the second refrigerant having a high concentration equal to or higher than a predetermined concentration (substantially state in which the second refrigerant flows alone).
- the state in which the second refrigerant flows substantially alone through the main refrigerant circuit 50 includes the state in which the second refrigerant having a concentration of 92 wt % or more flows through the main refrigerant circuit 50 .
- the refrigerant with the highest second refrigerant concentration (the refrigerant with the lowest first refrigerant concentration) is allowed to flow through the main refrigerant circuit 50 .
- the main refrigerant circuit 50 is supplied with a refrigerant having a second refrigerant concentration of 98 wt % or higher.
- the main refrigerant circuit 50 includes, as shown in FIG. and a utilization heat exchanger 40 .
- the main refrigerant circuit 50 includes a suction pipe 52a as shown in FIG. , a discharge pipe 52b, a first gas refrigerant pipe 52c, a liquid refrigerant pipe 52d, and a second gas refrigerant pipe 52e (see FIG. 1).
- the suction pipe 52 a connects the suction port 10 b of the compressor 10 and the channel switching mechanism 15 .
- the discharge pipe 52b connects the discharge port 10c of the compressor 10 and the channel switching mechanism 15 .
- the first gas refrigerant pipe 52 c connects the flow path switching mechanism 15 and the gas end of the heat source heat exchanger 20 .
- the liquid refrigerant pipe 52 d connects the liquid end of the heat source heat exchanger 20 and the liquid end of the heat utilization heat exchanger 40 .
- An expansion mechanism 30 is provided in the liquid refrigerant pipe 52d.
- the second gas refrigerant pipe 52 e connects the gas end of the heat utilization heat exchanger 40 and the channel switching mechanism 15 .
- (2-1-1) Compressor The compressor 10 sucks low-pressure refrigerant in the refrigeration cycle from the suction port 10b, compresses the refrigerant in a compression mechanism (not shown), and releases high-pressure refrigerant in the refrigeration cycle from the discharge port 10c. Dispense. Although only one compressor 10 is depicted in FIG. 1, the main refrigerant circuit 50 may have multiple compressors 10 connected in series or in parallel.
- the compressor 10 is, for example, a scroll compressor.
- the compressor 10 is not limited to this, and may be a compressor of a type other than a scroll compressor, such as a rotary compressor.
- the type of compressor 10 may be selected as appropriate.
- the compressor 10 is, but not limited to, an inverter-controlled compressor in which the rotation speed of the motor 10a is variable.
- a later-described controller 110 that controls the operation of the compressor 10 controls the rotation speed of the motor 10a of the compressor 10 according to, for example, the air conditioning load.
- the channel switching mechanism 15 is a mechanism that switches the flow direction of the refrigerant in the main refrigerant circuit 50 according to the operation mode (cooling operation mode/heating operation mode) of the refrigeration cycle device 100.
- the cooling operation mode is an operation mode of the refrigeration cycle apparatus 100 that causes the heat source heat exchanger 20 to function as a radiator and the utilization heat exchanger 40 to function as an evaporator.
- the heating operation mode is an operation mode of the refrigeration cycle apparatus 100 in which the utilization heat exchanger 40 functions as a radiator and the heat source heat exchanger 20 functions as an evaporator.
- the flow path switching mechanism 15 switches the flow direction of the refrigerant in the main refrigerant circuit 50 so that the refrigerant discharged from the compressor 10 is sent to the heat source heat exchanger 20 .
- the channel switching mechanism 15 communicates the suction pipe 52a with the second gas refrigerant pipe 52e and communicates the discharge pipe 52b with the first gas refrigerant pipe 52c (solid line in FIG. 1). reference).
- the flow path switching mechanism 15 switches the flow direction of the refrigerant in the main refrigerant circuit 50 so that the refrigerant discharged from the compressor 10 is sent to the utilization heat exchanger 40 .
- the channel switching mechanism 15 communicates the suction pipe 52a with the first gas refrigerant pipe 52c, and communicates the discharge pipe 52b with the second gas refrigerant pipe 52e (broken line in FIG. 1). reference).
- the channel switching mechanism 15 is, for example, a four-way switching valve. However, the channel switching mechanism 15 may be realized by means other than the four-way switching valve. For example, the channel switching mechanism 15 may be configured by combining a plurality of solenoid valves and pipes so as to switch the flow direction of the refrigerant.
- the heat source heat exchanger 20 functions as a refrigerant radiator when the refrigeration cycle device 100 is operated in the cooling operation mode, and functions as a refrigerant radiator when the refrigeration cycle device 100 is in the heating operation mode. When operated, it functions as an evaporator of refrigerant. Although only one heat source heat exchanger 20 is illustrated in FIG. 1, the main refrigerant circuit 50 may have a plurality of heat source heat exchangers 20 arranged in parallel.
- the heat source heat exchanger 20 is, for example, a fin-and-tube heat exchanger having a plurality of heat transfer tubes and a plurality of heat transfer fins.
- a first gas refrigerant pipe 52c is connected to one end of the heat source heat exchanger 20 as shown in FIG.
- a liquid refrigerant pipe 52d is connected to the other end of the heat source heat exchanger 20 as shown in FIG.
- refrigerant flows into the heat source heat exchanger 20 from the first gas refrigerant pipe 52c.
- the refrigerant that has flowed into the heat source heat exchanger 20 from the first gas refrigerant pipe 52c exchanges heat with air supplied by a fan (not shown) to radiate heat, and at least a portion of the refrigerant is condensed.
- the refrigerant that has dissipated heat in the heat source heat exchanger 20 flows out to the liquid refrigerant pipe 52d.
- refrigerant flows into the heat source heat exchanger 20 from the liquid refrigerant pipe 52d.
- the refrigerant that has flowed into the heat source heat exchanger 20 from the liquid refrigerant pipe 52d absorbs heat and evaporates by exchanging heat with air supplied by a fan (not shown) in the heat source heat exchanger 20 .
- the refrigerant that has absorbed heat (heated) in the heat source heat exchanger 20 flows out to the first gas refrigerant pipe 52c.
- heat is exchanged between the refrigerant flowing inside and the air as the heat source supplied to the heat source heat exchanger 20. It is not limited to a heat exchanger that exchanges heat between and a refrigerant.
- the heat source heat exchanger 20 may be a heat exchanger that exchanges heat between a refrigerant flowing inside and a liquid as a heat source supplied to the heat source heat exchanger 20 .
- the expansion mechanism 30 is a mechanism for decompressing the refrigerant and adjusting the flow rate of the refrigerant.
- the expansion mechanism 30 is an electronic expansion valve whose opening is adjustable. The degree of opening of the expansion mechanism 30 is appropriately adjusted according to the operating conditions.
- the expansion mechanism 30 is not limited to an electronic expansion valve, and may be a thermostatic expansion valve or a capillary tube.
- the utilization heat exchanger 40 functions as a refrigerant evaporator when the refrigeration cycle device 100 is operated in the cooling operation mode, and functions as a refrigerant evaporator when the refrigeration cycle device 100 is operated in the heating operation mode. It functions as a heat radiator for the refrigerant when it is operated.
- the utilization heat exchanger 40 cools the object of temperature adjustment (air in this embodiment).
- the utilization heat exchanger 40 heats a temperature-adjusted object (air in this embodiment) when functioning as a radiator.
- the refrigeration cycle device 100 has only one utilization heat exchanger 40 .
- the main refrigerant circuit 50 of the refrigeration cycle device 100 may have a plurality of utilization heat exchangers 40 arranged in parallel.
- each utilization unit 4 may have an expansion mechanism (not shown) (for example, an electronic expansion valve with adjustable opening) arranged on the liquid side of the utilization heat exchanger 40 .
- the utilization heat exchanger 40 is, for example, a fin-and-tube heat exchanger having a plurality of heat transfer tubes and a plurality of heat transfer fins.
- a liquid refrigerant pipe 52d is connected to one end of the utilization heat exchanger 40 as shown in FIG.
- a second gas refrigerant pipe 52e is connected to the other end of the utilization heat exchanger 40 as shown in FIG.
- refrigerant flows into the utilization heat exchanger 40 from the liquid refrigerant pipe 52d.
- the refrigerant flowing into the utilization heat exchanger 40 from the liquid refrigerant pipe 52d exchanges heat with air supplied by a fan (not shown) in the utilization heat exchanger 40, absorbs heat, and evaporates.
- the refrigerant that has absorbed heat (heated) in the heat utilization heat exchanger 40 flows out to the second gas refrigerant pipe 52e.
- the air cooled by the heat exchanger 40 and the temperature of which is to be adjusted is blown out into the air-conditioned space.
- refrigerant flows into the utilization heat exchanger 40 from the second gas refrigerant pipe 52e.
- the refrigerant flowing into the utilization heat exchanger 40 from the second gas refrigerant pipe 52e radiates heat by exchanging heat with air supplied by a fan (not shown), and is at least partially condensed.
- the refrigerant that has dissipated heat in the utilization heat exchanger 40 flows out to the liquid refrigerant pipe 52d. Note that the air heated by the heat exchanger 40 to be temperature-controlled is blown out into the air-conditioned space.
- the changer 70 is a mechanism that changes the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 .
- the change unit 70 includes a first bypass channel 80, a refrigerant container 72, a heat source side valve 82a, and a usage side valve 82b.
- the first bypass channel 80 is a pipe that connects the heat source side end A of the main refrigerant circuit 50 and the usage side end B of the main refrigerant circuit 50 .
- the heat source side end A is a portion of the liquid refrigerant pipe 52 d of the main refrigerant circuit 50 between the heat source heat exchanger 20 and the expansion mechanism 30 .
- a utilization side end B is a portion of the liquid refrigerant pipe 52 d of the main refrigerant circuit 50 between the utilization heat exchanger 40 and the expansion mechanism 30 .
- a coolant container 72, a heat source side valve 82a, and a usage side valve 82b are arranged in the first bypass channel 80.
- the refrigerant container 72 is a container capable of storing refrigerant inside.
- the heat source side valve 82 a is arranged between the heat source side end A and the changing portion 70 .
- the usage-side valve 82 b is arranged between the usage-side end B and the changing section 70 .
- the heat source side valve 82a and the utilization side valve 82b are electronic expansion valves whose degree of opening is adjustable.
- a method for changing the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 by the changing unit 70 will be described.
- the refrigerant is stored in the refrigerant container 72 according to the opening degrees of the heat source side valve 82a and the usage side valve 82b.
- the ratio of the liquid phase to the gas phase of the refrigerant can be increased or decreased.
- the composition ratio of the gas-phase refrigerant and the composition ratio of the liquid-phase refrigerant are approximately the same.
- first refrigerant low boiling point refrigerant
- second refrigerant high boiling point refrigerant
- the opening degrees of the heat source side valve 82a and the usage side valve 82b are adjusted to change the amount of liquid-phase refrigerant and the amount of gas-phase refrigerant stored in the refrigerant container 72, The amount of first refrigerant applied can be increased or decreased.
- the amount of the first refrigerant stored in the refrigerant container 72 is increased, the amount of the first refrigerant existing in the main refrigerant circuit 50 is reduced. can be enhanced. On the other hand, if the amount of the first refrigerant stored in the refrigerant container 72 is reduced, the amount of the first refrigerant existing in the main refrigerant circuit 50 will increase. can be lowered (the ratio of the first refrigerant is increased).
- the detection section 150 detects the composition ratio of the first refrigerant and the second refrigerant in the refrigerant circulating in the main refrigerant circuit 50 .
- the detection unit 150 includes a pipe 151 that connects between the heat source heat exchanger 20 and the expansion mechanism 30 and between the utilization heat exchanger 40 and the expansion mechanism 30 of the main refrigerant circuit 50 .
- the pipe 151 is used for detecting the composition of the refrigerant flowing through the main refrigerant circuit 50, and is not directly necessary for the vapor compression refrigeration cycle.
- the pipe 151 is a pipe having a smaller diameter than the liquid refrigerant pipe 52d, and a very small amount of refrigerant flows therethrough.
- the detection unit 150 includes a refrigerant container 152 and a valve 154 arranged in the pipe 151 .
- Valve 154 includes a first valve 154a and a second valve 154b.
- the first valve 154 a is arranged between the connecting portion of the pipe 151 to the liquid refrigerant pipe 52 d between the heat source heat exchanger 20 and the expansion mechanism 30 and the refrigerant container 152 .
- the second valve 154 b is arranged between the connecting portion of the pipe 151 to the liquid refrigerant pipe 52 d between the utilization heat exchanger 40 and the expansion mechanism 30 and the refrigerant container 152 .
- the first valve 154a and the second valve 154b are, for example, electronic expansion valves with variable opening.
- the detection unit 150 has a pressure sensor 156 that measures the pressure of the refrigerant inside the refrigerant container 152 and a temperature sensor 158 that measures the temperature of the refrigerant inside the refrigerant container 152 .
- the controller 110 opens the first valve 154a and the second valve 154b as necessary so that two-phase (liquid and gaseous) refrigerant exists in the refrigerant container 152.
- the first valve 154a and the second valve 154b are controlled to a predetermined degree of opening.
- the controller 110 opens the first valve 154 a and the second valve 154 b so that two-phase refrigerant is stored in the refrigerant container 152 .
- the valve 154b is controlled to a predetermined degree of opening.
- the composition ratio can be calculated if the type of refrigerant used in the non-azeotropic refrigerant mixture and the pressure and temperature of the two-phase refrigerant are known. Therefore, the detection unit 150 determines the composition ratio of the refrigerant in the refrigerant container 152, in other words, the main The composition ratio between the first refrigerant and the second refrigerant in the refrigerant flowing through the liquid refrigerant pipe 52d of the refrigerant circuit 50 can be detected.
- the composition ratio of the refrigerant is detected by the controller 110 functioning as part of the detection unit 150 and detecting the composition ratio of the refrigerant circulating in the main refrigerant circuit 50 based on the measurement results of the pressure sensor 156 and the temperature sensor 158. (Calculation) may be performed.
- the detection unit 150 may be a device independent of the controller 110 and detect the composition ratio of the refrigerant circulating in the main refrigerant circuit 50 based on the measurement results of the pressure sensor 156 and the temperature sensor 158 .
- the controller 110 detects the composition ratio of the refrigerant circulating through the main refrigerant circuit 50 based on the measurement results of the pressure sensor 156 and the temperature sensor 158 .
- data representing the relationship between the pressure and temperature of the two-phase refrigerant and the composition ratio of the non-azeotropic refrigerant mixture are stored.
- the controller 110 is based on the data stored in the memory representing the relationship between the pressure and temperature of the two-phase refrigerant and the composition ratio of the non-azeotropic refrigerant mixture, and the measurement results of the pressure sensor 156 and the temperature sensor 158. to detect the composition ratio of the refrigerant circulating in the main refrigerant circuit 50 .
- the method of detecting the composition ratio of the refrigerant circulating in the main refrigerant circuit 50 is not necessarily limited to the method exemplified here, and the detection unit 150 can be detected by another method or by using equipment different from the above method. may be used to detect the composition ratio of the refrigerant circulating in the main refrigerant circuit 50 .
- the controller 110 is a control unit for controlling operations of various devices of the refrigeration cycle apparatus 100 .
- the controller 110 mainly includes, for example, a microcontroller unit (MCU) and various electric circuits and electronic circuits (not shown).
- the MCU includes a CPU, memory, I/O interfaces, and the like.
- Various programs for the CPU of the MCU to execute are stored in the memory of the MCU.
- an FPGA or an ASIC may be used for the controller 110 .
- the various functions of the controller 110 do not need to be implemented by software, and may be implemented by hardware or through cooperation between hardware and software.
- the controller 110 may be a device independent of the heat source unit 2 and the utilization unit 4. Further, the controller 110 is not a device independent of the heat source unit 2 and the usage unit 4. For example, a controller (not shown) mounted on the heat source unit 2, a controller (not shown) mounted on the utilization unit 4, may function as the controller 110 by working together.
- the controller 110 is electrically connected to the compressor 10, the flow path switching mechanism 15, and the expansion mechanism 30 of the main refrigerant circuit 50, and controls the operations of the compressor 10, the flow path switching mechanism 15, and the expansion mechanism 30. (See Figure 1). Further, the controller 110 controls the operation of a fan (not shown) that supplies air to the heat source heat exchanger 20 of the heat source unit 2 and a fan (not shown) that supplies air to the utilization heat exchanger 40 of the utilization unit 4. These fans are electrically connected. The controller 110 is also electrically connected to the heat source side valve 82a and the usage side valve 82b of the changing unit 70, and controls the operation of the heat source side valve 82a and the usage side valve 82b (see FIG. 1).
- the controller 110 is electrically connected to the first valve 154a and the second valve 154b so as to control the operation of the first valve 154a and the second valve 154b of the detector 150 . Also, the controller 110 is electrically connected to the pressure sensor 156 and the temperature sensor 158 and can acquire the measured values of the pressure sensor 156 and the temperature sensor 158 . The controller 110 is also electrically connected to sensors (not shown) arranged at various locations in the refrigeration cycle apparatus 100 other than the pressure sensor 156 and the temperature sensor 158, and can acquire measurement values of these sensors.
- the controller 110 executes various controls, for example, by the CPU executing a program stored in the memory.
- the controller 110 controls operations of various devices of the refrigeration cycle device 100 when the refrigeration cycle device 100 performs cooling operation or heating operation.
- the controller 110 increases or decreases the rotation speed of the compressor 10 according to the required capacity of the refrigeration cycle device 100, or controls the operation of the change unit 70 to The composition ratio with the second refrigerant is changed.
- composition ratio control to avoid complication of the description
- the controller 110 performs the cooling operation when an instruction to perform the cooling operation is given from a remote controller (not shown) or when it is determined that the cooling operation needs to be performed in view of the temperature of the air-conditioned space. to run.
- the controller 110 controls the operation of the flow path switching mechanism 15 so that the heat source heat exchanger 20 functions as a refrigerant radiator and the utilization heat exchanger 40 functions as a refrigerant evaporator.
- the controller 110 also starts the operation of the compressor 10 and the fans mounted in the heat source unit 2 and the utilization unit 4 (not shown).
- the controller 110 controls the rotation speed of the motor 10a of the compressor 10, the heat source unit 2 and the utilization unit 4 based on the measurement values of various sensors of the refrigeration cycle apparatus 100, the target temperature of the air-conditioned space set by the user, and the like. The number of rotations of the fan mounted on the , and the opening degree of the electronic expansion valve as the expansion mechanism 30 are adjusted.
- the controller 110 performs the heating operation when an instruction to perform the heating operation is given from a remote controller (not shown) or when it is determined that the heating operation needs to be performed in view of the temperature of the air-conditioned space. to run.
- the controller 110 controls the operation of the flow path switching mechanism 15 so that the heat source heat exchanger 20 functions as a refrigerant evaporator and the utilization heat exchanger 40 functions as a refrigerant radiator.
- the controller 110 also starts the operation of the compressor 10 and the fans mounted in the heat source unit 2 and the utilization unit 4 (not shown).
- the controller 110 controls the rotation speed of the motor 10a of the compressor 10, the heat source unit 2 and the utilization unit 4 based on the measurement values of various sensors of the refrigeration cycle apparatus 100, the target temperature of the air-conditioned space set by the user, and the like. The number of rotations of the fan mounted on the , and the opening degree of the electronic expansion valve as the expansion mechanism 30 are adjusted.
- the controller 110 interrupts the heating operation, controls the operation of the flow path switching mechanism 15, and controls the flow direction of the refrigerant in the main refrigerant circuit 50. is switched in the same direction as during cooling operation to perform defrost operation (reverse cycle defrost operation).
- the defrost operation is an operation for removing frost adhering to the heat source heat exchanger 20 . Since the defrost operation of the refrigeration cycle device is generally known, the detailed description of the defrost operation will be omitted.
- the controller 110 operates in a first mode in which the second refrigerant flows substantially independently in the main refrigerant circuit 50, and in a main mode. The reason for switching between the second mode in which the mixed refrigerant of the first refrigerant and the second refrigerant flows through the refrigerant circuit 50 will be described.
- the refrigeration cycle device 100 can be operated with relatively high efficiency.
- a second refrigerant refrigerant with a high boiling point
- a high boiling point refrigerant is used, there is a possibility of insufficient performance during heating operation at low outside temperatures.
- a non-azeotropic mixed refrigerant in which a high boiling point refrigerant is mixed with a first refrigerant (low boiling point refrigerant) such as CO2
- the lack of capacity can be compensated for.
- the efficiency is lower than in the case of using the second refrigerant alone.
- the controller 110 operates in accordance with the required capacity of the refrigeration cycle apparatus 100 to operate in a first mode in which the second refrigerant is allowed to flow substantially solely through the main refrigerant circuit 50, and in which a mixture of the first refrigerant and the second refrigerant flows through the main refrigerant circuit 50.
- a second mode in which the coolant flows is switched and executed.
- the controller 110 executes the first mode during cooling operation in which the required capacity is relatively low and insufficient capacity is unlikely to occur even if the second refrigerant is used substantially alone.
- controller 110 does not execute the second mode during cooling operation.
- the controller 110 executes the first mode when using the utilization heat exchanger 40 as an evaporator. Therefore, although detailed description is omitted, after execution of the second mode (for example, after execution of the second mode during heating operation, when composition ratio control for executing the first mode is not performed) 2), the controller 110 executes composition ratio control for allowing the second refrigerant to flow substantially solely through the main refrigerant circuit 50 at the start of the cooling operation.
- the controller 110 executes the second mode during heating operation when the required capacity tends to be relatively large and the first mode is likely to result in insufficient capacity. In short, the controller 110 executes the second mode when using the utilization heat exchanger 40 as a radiator.
- FIG. 2 shows the change in COP when changing the capacity by changing the rotation speed of the motor 10a of the compressor 10, and the change in COP when changing the capacity by changing the ratio of the first refrigerant in the refrigerant.
- a solid line in FIG. 2 indicates a change in COP when the rotation speed of the motor 10a of the compressor 10 is increased to increase the capacity of the refrigeration cycle apparatus 100.
- controller 110 does not always execute the second mode during heating operation (in other words, when utilizing heat exchanger 40 as a radiator), but according to the required capacity of refrigeration cycle device 100, It is preferable to execute the first mode or the second mode.
- the controller 110 can combine control of the rotational speed of the motor 10a of the compressor 10 and composition ratio control.
- FIG. 3 is an example of a flow chart of control performed when the refrigeration cycle apparatus 100 has insufficient capacity.
- FIG. 4 is an example of a flow chart of control performed when the refrigeration cycle apparatus 100 is overcapacity. The processes of FIGS. 3 and 4 are executed in parallel.
- the position corresponding to the intersection of the line shown by the two-dot chain line in FIG. It is assumed that the rotation speed (upper limit rotation speed) of the motor 10a is obtained in advance.
- the upper limit rotation speed may be obtained by experiments using an actual machine, or may be obtained by simulation or theoretical calculation.
- the memory of the controller 110 stores the value of the upper limit rotation speed obtained in advance.
- the controller 110 controls the rotation speed of the motor 10a of the compressor 10 according to the flowchart of FIG. Control the composition ratio.
- step S1 of the flow chart in Fig. 3 it is determined whether the required capacity cannot be achieved in the current operation (whether the capacity is insufficient). The determination of step S1 is repeatedly executed until it is determined that the ability is insufficient.
- step S2 it is determined whether or not the current rotation speed of the motor 10a of the compressor 10 is the upper limit rotation speed. If it is determined that the rotation speed of the motor 10a of the compressor 10 has not reached the upper limit rotation speed, the process proceeds to step S3.
- step S3 the controller 110 increases the rotation speed of the motor 10a of the compressor 10.
- the controller 110 may increase the rotational speed by a predetermined value, or may change the increment of the rotational speed according to the performance that is insufficient for the required performance. After performing step S3, the process returns to step S1.
- step S2 if it is determined in step S2 that the rotation speed of the motor 10a of the compressor 10 has reached the upper limit rotation speed, the process proceeds to step S4.
- step S ⁇ b>4 the controller 110 performs composition ratio control to increase the ratio of the first refrigerant in the refrigerant flowing through the main refrigerant circuit 50 .
- the controller 110 executes the second mode when the required capacity cannot be obtained even if the rotation speed of the compressor 10 is increased to a predetermined rotation speed (upper limit rotation speed) while executing the first mode,
- the changing unit 70 is controlled so that the mixed refrigerant of the first refrigerant and the second refrigerant flows through the main refrigerant circuit 50 .
- the controller 110 may increase the ratio of the first refrigerant by a predetermined value (for example, increase by 2 wt%), or the ratio of the first refrigerant may be determined by how much to increase
- step S4 the controller 110 changes the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 detected by the detection unit 150 to the target composition ratio.
- the opening degrees of the heat source side valve 82a and the usage side valve 82b of the unit 70 are controlled.
- the controller 110 opens the heat source side valve 82a and the utilization side valve 82b. close up. After performing step S4, the process returns to step S1.
- step S4 when the process of step S4 is performed again after step S4 is performed, the controller 110 controls the operation of the changing unit 70 in the second mode so that the first refrigerant in the refrigerant flowing through the main refrigerant circuit 50
- the composition ratio of the refrigerant and the second refrigerant is changed between the first composition ratio and the second composition ratio in which the ratio of the first refrigerant is higher than the first composition ratio.
- the controller 110 executes the process described in the flowchart of FIG. 4 in parallel with the process described in the flowchart of FIG. 3 during the heating operation.
- the controller 110 controls the rotational speed of the motor 10a of the compressor 10 according to the flow chart of FIG. , to control the composition ratio.
- step S11 of the flow chart of FIG. 4 it is determined whether or not the capacity is excessive with respect to the required capacity in the current operation. The determination of step S11 is repeatedly executed until it is determined that the capacity is excessive.
- step S12 it is determined whether or not the current ratio of the first refrigerant in the refrigerant flowing through the main refrigerant circuit 50 (in other words, the concentration of the first refrigerant) is the lower limit value.
- the lower limit value of the ratio of the first refrigerant is, for example, a predetermined concentration at which the controller 110 determines that the refrigerant flowing through the main refrigerant circuit 50 is substantially the single second refrigerant.
- the controller 110 determines whether or not the mode being executed is the first mode.
- step S12 If it is determined in step S12 that the ratio of the first refrigerant in the current refrigerant flowing through the main refrigerant circuit 50 is the lower limit value (if it is determined that the first mode is being executed), the process proceeds to step S13. . On the other hand, if it is determined that the current ratio of the first refrigerant in the refrigerant flowing through the main refrigerant circuit 50 is not the lower limit value, the process proceeds to step S14.
- step S13 the controller 110 reduces the rotation speed of the motor 10a of the compressor 10.
- the controller 110 may reduce the rotation speed by a predetermined value, or may change how much the rotation speed is reduced according to the excess capacity with respect to the required capacity. After performing step S13, the process returns to step S11.
- step S ⁇ b>14 the controller 110 performs composition ratio control to reduce the ratio of the first refrigerant in the refrigerant flowing through the main refrigerant circuit 50 .
- the controller 110 may reduce the ratio of the first refrigerant by a predetermined value, or determine how much the ratio of the first refrigerant should be reduced according to the excess capacity with respect to the required capacity. You can change it.
- step S14 the controller 110 changes the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 detected by the detection unit 150 to the target composition ratio.
- the opening degrees of the heat source side valve 82a and the usage side valve 82b of the unit 70 are controlled.
- the controller 110 opens the heat source side valve 82a and the utilization side valve 82b. close up.
- the refrigeration cycle device 100 includes a main refrigerant circuit 50, a changing section 70, and a controller 110 as an example of a control section.
- the main refrigerant circuit 50 uses a non-azeotropic mixed refrigerant containing a first refrigerant and a second refrigerant.
- the changing unit 70 changes the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 .
- Controller 110 controls the operation of changing unit 70 .
- Controller 110 executes a first mode and a second mode.
- the first mode is a mode in which the operation of the changing unit 70 is controlled to allow the second refrigerant to flow through the main refrigerant circuit 50 substantially independently.
- the second mode is a mode in which the operation of the changing unit 70 is controlled to allow the mixed refrigerant of the first refrigerant and the second refrigerant to flow through the main refrigerant circuit 50 .
- the refrigeration cycle device 100 can use the second refrigerant substantially alone, or can use a non-azeotropic mixed refrigerant containing the first refrigerant and the second refrigerant. Refrigerants with different compositions can be used.
- a refrigerant having a second refrigerant concentration of 92 wt % or more is allowed to flow through the main refrigerant circuit 50.
- the main refrigerant circuit 50 in the first mode, is fed with a second refrigerant having a concentration of 98 wt% or more.
- the refrigeration cycle device 100 includes a detection section 150 .
- the detection unit 150 detects the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 .
- the controller 110 controls the operation of the changing unit 70 so that the composition ratio of the first refrigerant and the second refrigerant detected by the detection unit 150 becomes the target composition ratio.
- the composition ratio between the first refrigerant and the second refrigerant is changed while detecting the composition ratio of the refrigerant, so refrigerant with an appropriate composition can be used according to the operating conditions.
- the boiling point of the second refrigerant is higher than the boiling point of the first refrigerant.
- the first refrigerant is CO2.
- the second refrigerant is R1234Ze or R1234yf.
- the main refrigerant circuit 50 includes the utilization heat exchanger 40 that adjusts the temperature of a temperature-adjusted object.
- the controller 110 executes the first mode.
- the controller 110 executes the second mode.
- the second refrigerant can be used substantially independently to operate with an emphasis on efficiency.
- the heat exchanger 40 which is likely to have insufficient capacity, is used as a radiator, the required capacity can be obtained by using the non-azeotropic mixed refrigerant of the first refrigerant and the second refrigerant. .
- the controller 110 executes the first mode or the second mode according to the required capacity of the refrigerating cycle device 100 .
- the second refrigerant is used substantially independently. It can be used to drive with an emphasis on efficiency.
- main refrigerant circuit 50 includes compressor 10 .
- Controller 110 controls the rotation speed of compressor 10 .
- the controller 110 executes the second mode when the required performance cannot be obtained even if the rotational speed of the compressor 10 is increased to a predetermined rotational speed (upper limit rotational speed) while the first mode is being executed.
- the controller 110 controls the operation of the changing unit 70 to change the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50. , the first composition ratio and the second composition ratio. In the second composition ratio, the proportion of the first refrigerant is higher than in the first composition ratio.
- the composition ratio between the first refrigerant and the second refrigerant is changed in stages, so that the necessary capacity can be obtained while suppressing the decrease in efficiency.
- Refrigeration cycle device 100 includes compressor 10 in main refrigerant circuit 50 .
- Controller 110 controls the rotation speed of compressor 10 .
- the controller 110 controls either the rotational speed of the compressor 10 or the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 in accordance with changes in the required capacity of the refrigeration cycle device 100. to change
- the controller 110 closes the main refrigerant circuit 50 when the ratio of the first refrigerant in the refrigerant flowing through the main refrigerant circuit 50 is higher than a predetermined value (lower limit) when the required capacity is reduced.
- the changing unit 70 is controlled to reduce the ratio of the first refrigerant in the flowing refrigerant, and when the ratio of the first refrigerant in the refrigerant flowing in the main refrigerant circuit 50 is equal to or less than a predetermined value (lower limit value), the compressor 10 Decrease the rpm.
- the mechanism for changing the composition of the refrigerant flowing through the main refrigerant circuit 50 is not limited to the mechanism like the changing section 70 of the above embodiment.
- the refrigeration cycle apparatus 100 may have a changing section 170 instead of the changing section 70 as shown in FIG.
- the changing unit 170 includes a container 172 filled with an adsorbent 172a.
- Other configurations are the same as those of the changing unit 70 of the above embodiment.
- the adsorbent 172a has the property of adsorbing the first refrigerant. Specifically, in the refrigeration cycle apparatus 100 of the first embodiment, the adsorbent 172a has the property of adsorbing CO2.
- the adsorbent 172a has a property of not adsorbing the second refrigerant. Specifically, in the refrigeration cycle apparatus 100 of the first embodiment, the adsorbent 172a does not adsorb R1234Ze or R1234yf used as the second refrigerant. Alternatively, the adsorbent 172a may adsorb the second refrigerant in addition to the first refrigerant, but may have a characteristic that the adsorption performance of the second refrigerant is lower than that of the first refrigerant.
- the adsorbent 172a is, for example, zeolite with high CO2 adsorption performance.
- the adsorbent 172a may be a metal-organic framework (MOF) having high CO2 adsorption performance.
- MOF metal-organic framework
- the type of the adsorbent 172a is the exemplified type if it adsorbs the first refrigerant and does not adsorb the second refrigerant or if the adsorption performance of the second refrigerant is lower than the adsorption performance of the first refrigerant. Not limited to materials.
- the heat source side valve 82 a and the utilization side valve 82 b are opened, and part of the refrigerant flowing through the main refrigerant circuit 50 flows into the container 172 .
- the refrigerant passes through the container 172, the first refrigerant is adsorbed by the adsorbent 172a, while the second refrigerant is not or hardly adsorbed by the adsorbent 172a. becomes a refrigerant with a high ratio of By allowing this to flow into the main refrigerant circuit 50, the ratio of the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 can be increased.
- the heat source side valve 82 a and the utilization side valve 82 b are opened, and part of the refrigerant flowing through the main refrigerant circuit 50 flows into the container 172 .
- the adsorbent 172a in the container 172 is further heated by using the heat of the high-temperature refrigerant discharged from the compressor 10, or by using the heat generated by the illustrated heater or the like.
- the first refrigerant is desorbed from the adsorbent 172a and mixed with the refrigerant flowing through the container 172, so that the refrigerant flowing out of the container 172 has a lower ratio of the second refrigerant (the ratio of the second refrigerant is lower than when it flowed into the container 172). low refrigerant ratio).
- this refrigerant By allowing this refrigerant to flow into the main refrigerant circuit 50, the ratio of the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 can be reduced. In other words, by causing this refrigerant to flow into the main refrigerant circuit 50, the ratio of the first refrigerant in the refrigerant flowing through the main refrigerant circuit 50 can be increased.
- the configuration of the change section is not limited to the illustrated one, and other configurations may be used as long as the composition ratio of the refrigerant flowing through the main refrigerant circuit 50 can be changed.
- the modification may utilize a refrigerant rectification tower.
- the refrigeration cycle apparatus using a non-azeotropic refrigerant mixture in which the first refrigerant is CO2 and the second refrigerant is HFO refrigerant R1234Ze or R1234yf has been described.
- the types of the first refrigerant and the second refrigerant are not limited to the illustrated refrigerants.
- the first refrigerant may be HFO refrigerant R1132(E) (trans-1,2-difluoroethylene) or R1123 (trifluoroethylene).
- the refrigeration cycle device of the present disclosure is described by taking the refrigeration cycle device 100 installed in a building or the like as an example.
- the refrigeration cycle apparatus of the present disclosure is not limited to those installed in buildings.
- the refrigeration cycle device of the present disclosure may be, for example, a device mounted on a vehicle such as an automobile.
- the refrigeration cycle device of the present disclosure is described by taking as an example the case where the refrigeration cycle device 100 includes the heat source unit 2 and the utilization unit 4 connected to the heat source unit 2 through refrigerant piping.
- the refrigeration cycle device of the present disclosure is not limited to such devices.
- the refrigeration cycle apparatus of the present disclosure may be an integrated apparatus in which all devices are mounted in one casing.
- the controller 110 executes the first mode in which the second refrigerant is used substantially alone when the utilization heat exchanger 40 is used as an evaporator.
- the controller 110 is not limited to this, and in addition to the first mode, the controller 110, when using the utilization heat exchanger 40 as an evaporator, if there is a condition that causes a problem of insufficient capacity, A second mode may be performed in which a non-azeotropic refrigerant mixture of the first refrigerant and the second refrigerant is used.
- the refrigeration cycle device may be a device that only performs an operation for cooling the object to be temperature-adjusted.
- the refrigeration cycle device 100 is a device capable of switching between an operation using the heat exchanger 40 as an evaporator and an operation using the heat exchanger 40 as a radiator.
- the refrigeration cycle device 100 is not limited to this, and may be a device that mainly performs only the operation using the utilization heat exchanger 40 as a radiator.
- the relationship between the capacity and the power consumption when the rotation speed of the motor 10a of the compressor 10 is changed, and the ratio of the first refrigerant of the refrigerant flowing through the main refrigerant circuit 50 is changed.
- the relationship between the capacity and the amount of power consumption when the engine is turned on may be obtained, and the upper limit rotation speed of the compressor, which serves as a threshold, may be determined in advance.
- the upper limit rotation speed is stored, for example, in the memory (storage unit) of the controller 110 .
- the compressor 10 may be provided with an ammeter or a watt-hour meter 10d. Then, when the demand for the refrigerating cycle device 100 increases, the controller 110 maintains the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 without changing the composition ratio of the motor 10a of the compressor 10. The change in the current value when the rotation speed is changed, and the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 is changed without changing the rotation speed of the motor 10a of the compressor 10. A change in the current value in each case may be actually measured. Then, the controller 110 may select, of the two controls, the one in which the current value of the compressor 10 actually increased less as the control to be finally executed.
- the composition ratio between the first refrigerant and the second refrigerant is changed stepwise in the second mode, but it is not limited to this.
- the controller 110 controls the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the main refrigerant circuit 50 to always be a predetermined (always the same) composition ratio. good.
- the present disclosure is widely applicable and useful to refrigeration cycle devices.
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Abstract
Description
(1)全体概要
図1を参照して、第1実施形態に係る冷凍サイクル装置100を説明する。図1は、冷凍サイクル装置100の概略構成図である。 <First embodiment>
(1) Overall Overview A
(2-1)主冷媒回路
主冷媒回路50は、図1に示すように、圧縮機10と、流路切換機構15と、熱源熱交換器20と、膨張機構30と、利用熱交換器40と、を主に含む。 (2) Detailed Configuration (2-1) Main Refrigerant Circuit The main
圧縮機10は、吸入口10bから冷凍サイクルにおける低圧の冷媒を吸入して、図示しない圧縮機構において冷媒を圧縮し、冷凍サイクルにおける高圧の冷媒を吐出口10cから吐出する。図1では、圧縮機10は1台だけ描画されているが、主冷媒回路50は、直列又は並列に接続された複数の圧縮機10を有してもよい。 (2-1-1) Compressor The
流路切換機構15は、冷凍サイクル装置100の運転モード(冷房運転モード/暖房運転モード)に応じ、主冷媒回路50における冷媒の流れ方向を切り換える機構である。冷房運転モードは、熱源熱交換器20を放熱器として機能させ、利用熱交換器40を蒸発器として機能させる冷凍サイクル装置100の運転モードである。暖房運転モードは、利用熱交換器40を放熱器として機能させ、熱源熱交換器20を蒸発器として機能させる冷凍サイクル装置100の運転モードである。 (2-1-2) Channel Switching Mechanism The
熱源熱交換器20は、冷凍サイクル装置100が冷房運転モードで運転される際には冷媒の放熱器として機能し、冷凍サイクル装置100が暖房運転モードで運転される際には冷媒の蒸発器として機能する。図1では、熱源熱交換器20は1台だけ描画されているが、主冷媒回路50は、複数の並列に配置された熱源熱交換器20を有してもよい。 (2-1-3) Heat Source Heat Exchanger The heat
膨張機構30は、冷媒の減圧や、冷媒の流量調節を行う機構である。本実施形態では、膨張機構30は、開度調節可能な電子膨張弁である。膨張機構30の開度は、運転状況に応じて適宜調節される。なお、膨張機構30は、電子膨張弁に限定されるものではなく、温度自動膨張弁や、キャピラリチューブであってもよい。 (2-1-4) Expansion Mechanism The
利用熱交換器40は、冷凍サイクル装置100が冷房運転モードで運転される際には冷媒の蒸発器として機能し、冷凍サイクル装置100が暖房運転モードで運転される際には冷媒の放熱器として機能する。利用熱交換器40は、蒸発器として機能する際には、温度調整対象(本実施形態では空気)を冷却する。利用熱交換器40は、放熱器として機能する際には、温度調整対象(本実施形態では空気)を加熱する。 (2-1-5) Utilization heat exchanger The
変更部70は、主冷媒回路50を流れる冷媒中の、第1冷媒と第2冷媒との組成比を変更する機構である。 (2-2) Changer The
検知部150は、主冷媒回路50内を循環する冷媒中の、第1冷媒と第2冷媒との組成比を検知する。 (2-3) Detection Section The
コントローラ110は、冷凍サイクル装置100の各種機器の動作を制御するための制御部である。 (2-4) Controller The
コントローラ110は、図示しないリモコンから冷房運転の実行が指示された時や、空調対象空間の温度から見て冷房運転の実行が必要と判断される時に、冷房運転を実行する。 (2-5-1) Cooling operation The
コントローラ110は、図示しないリモコンから暖房運転の実行が指示された時や、空調対象空間の温度から見て暖房運転の実行が必要と判断される時に、暖房運転を実行する。 (2-5-2) Heating operation The
以下に、コントローラ110が実行する、冷凍サイクル装置100に対する要求能力に応じた圧縮機10及び変更部70の制御について説明する。 (2-5-3) Control of Compressor and Changer Dependent on Required Capability Control of
(3-1)
冷凍サイクル装置100は、主冷媒回路50と、変更部70と、制御部の一例としてのコントローラ110と、を備える。主冷媒回路50は、第1冷媒と第2冷媒とを含む非共沸混合冷媒を用いる。変更部70は、主冷媒回路50を流れる冷媒中の、第1冷媒と第2冷媒との組成比を変更する。コントローラ110は、変更部70の動作を制御する。コントローラ110は、第1モードと、第2モードと、を実行する。第1モードは、変更部70の動作を制御して主冷媒回路50に第2冷媒を略単独で流すモードである。第2モードは、変更部70の動作を制御して主冷媒回路50に第1冷媒と第2冷媒との混合冷媒を流すモードである。 (3) Features (3-1)
The
冷凍サイクル装置100は、検知部150を備える。検知部150は、主冷媒回路50を流れる冷媒中の、第1冷媒と第2冷媒との組成比を検知する。コントローラ110は、検知部150が検知する第1冷媒と第2冷媒との組成比が目標組成比になるように、変更部70の動作を制御する。 (3-2)
The
冷凍サイクル装置100では、第2冷媒の沸点は、第1冷媒の沸点より高い。 (3-3)
In the
冷凍サイクル装置100では、主冷媒回路50は、温度調整対象の温度調整を行う利用熱交換器40を含む。利用熱交換器40を蒸発器として利用する際に、コントローラ110は、第1モードを実行する。利用熱交換器40を放熱器として利用する際に、コントローラ110は、第2モードを実行する。 (3-4)
In the
冷凍サイクル装置100は、利用熱交換器40を放熱器として利用する際に、コントローラ110は、冷凍サイクル装置100に対する要求能力に応じて、第1モード又は第2モードを実行する。 (3-5)
When the refrigerating
冷凍サイクル装置100では、主冷媒回路50は、圧縮機10を含む。コントローラ110は、圧縮機10の回転数を制御する。コントローラ110は、第1モードを実行中に、圧縮機10の回転数を所定の回転数(上限回転数)に上げても要求能力が得られない場合に、第2モードを実行する。 (3-6)
In
冷凍サイクル装置100では、コントローラ110は、第2モードを実行する際に、変更部70の動作を制御して、主冷媒回路50を流れる冷媒中の第1冷媒と第2冷媒との組成比を、第1組成比と、第2組成比と、の間で変更する。第2組成比では、第1組成比より第1冷媒の比率が高い。 (3-7)
In the
冷凍サイクル装置100は、主冷媒回路50は、圧縮機10を含む。コントローラ110は、圧縮機10の回転数を制御する。コントローラ110は、冷凍サイクル装置100に対する要求能力の変化に応じて、圧縮機10の回転数、又は、主冷媒回路50を流れる冷媒中の第1冷媒と第2冷媒との組成比、のいずれかを変更する。 (3-8)
冷凍サイクル装置100では、コントローラ110は、要求能力が低下した際に、主冷媒回路50を流れる冷媒中の第1冷媒の比率が所定値(下限値)より高い場合には、主冷媒回路50を流れる冷媒中の第1冷媒の比率を下げるよう変更部70を制御し、主冷媒回路50を流れる冷媒中の第1冷媒の比率が所定値(下限値)以下の場合には、圧縮機10の回転数を下げる。 (3-9)
In the
以下に、上記実施形態の変形例を説明する。なお、以下の変形例は、互いに矛盾しない範囲で適宜組み合わせられてもよい。 (4) Modifications Modifications of the above embodiment will be described below. It should be noted that the following modified examples may be appropriately combined within a mutually consistent range.
主冷媒回路50を流れる冷媒の組成を変更するための機構は、上記実施形態の変更部70のような機構に限定されるものではない。例えば、冷凍サイクル装置100は、図5のように、変更部70に代えて、変更部170を有するものであってもよい。 (4-1) Modification A
The mechanism for changing the composition of the refrigerant flowing through the main
上記実施形態では、第1冷媒はCO2であり、第2冷媒はHFO冷媒のR1234Ze又はR1234yfである非共沸混合冷媒を用いる冷凍サイクル装置について説明を行った。ただし、第1冷媒及び第2冷媒の種類は例示の冷媒に限定されるものではない。例えば、第1冷媒は、HFO冷媒のR1132(E)(トランス-1,2?ジフルオロエチレン)またはR1123(トリフルオロエチレン)であってもよい。このような冷媒の組合せでも、第2冷媒を実質的に単独で用いることで高効率の運転を実現しつつ、第2冷媒を単独で用いる場合には能力が不足する場合には、第1冷媒と第2冷媒との非共沸混合冷媒を用いることで能力不足を補うことができる。 (4-2) Modification B
In the above embodiment, the refrigeration cycle apparatus using a non-azeotropic refrigerant mixture in which the first refrigerant is CO2 and the second refrigerant is HFO refrigerant R1234Ze or R1234yf has been described. However, the types of the first refrigerant and the second refrigerant are not limited to the illustrated refrigerants. For example, the first refrigerant may be HFO refrigerant R1132(E) (trans-1,2-difluoroethylene) or R1123 (trifluoroethylene). Even with such a combination of refrigerants, high-efficiency operation is realized by using the second refrigerant substantially alone, and if the capacity is insufficient when the second refrigerant is used alone, the first refrigerant Insufficient capacity can be compensated for by using a non-azeotropic mixture of refrigerant and the second refrigerant.
上記実施形態では、建物等に設置される冷凍サイクル装置100を例に、本開示の冷凍サイクル装置を説明している。しかし、本開示の冷凍サイクル装置は、建物に設置されるものに限定されない。本開示の冷凍サイクル装置は、例えば、自動車等の乗物に搭載される装置であってもよい。 (4-3) Modification C
In the above embodiment, the refrigeration cycle device of the present disclosure is described by taking the
上記実施形態では、冷凍サイクル装置100が、熱源ユニット2と、熱源ユニット2に冷媒配管により接続される利用ユニット4と、を有する場合を例に、本開示の冷凍サイクル装置を説明している。しかし、本開示の冷凍サイクル装置は、このような装置に限定されるものではない。例えば、本開示の冷凍サイクル装置は、全ての機器が1つのケーシングに搭載される一体式の装置であってもよい。 (4-4) Modification D
In the above-described embodiment, the refrigeration cycle device of the present disclosure is described by taking as an example the case where the
上記実施形態では、コントローラ110は、利用熱交換器40を蒸発器として使用する際には、第2冷媒が実質単独で使用される第1モードを実行する。ただし、これに限定されるものでなく、コントローラ110は、利用熱交換器40を蒸発器として使用する際にも、能力不足が問題となる条件が存在する場合には、第1モードに加え、第1冷媒と第2冷媒との非共沸混合冷媒が使用される第2モードを実行してもよい。この場合、冷凍サイクル装置は、温度調整対象を冷却する運転だけを行う装置であってもよい。 (4-5) Modification E
In the above embodiment, the
上記実施形態では、冷凍サイクル装置100は、利用熱交換器40を蒸発器として使用する運転と、利用熱交換器40を放熱器として使用する運転と、を切り換えて実行可能な装置である。ただし、これに限定されるものでなく、冷凍サイクル装置100は、利用熱交換器40を放熱器として使用する運転だけを主に行う装置であってもよい。 (4-6) Modification F
In the above embodiment, the
上記実施形態では、要求能力の変化に応じて冷凍サイクル装置100の能力を増大させる際に、コントローラ110は、圧縮機10のモータ10aの回転数と、主冷媒回路50を流れる冷媒の組成比のうち、変更後によりCOPを高く維持可能な方を変更する。これに代えて、コントローラ110は、要求能力の変化に応じて冷凍サイクル装置100の能力を増大させる際に、圧縮機10のモータ10aの回転数と、主冷媒回路50を流れる冷媒の組成比のうち、より電力増加量の低い方を変更してもよい。 (4-7) Modification G
In the above embodiment, when increasing the capacity of the
上記実施形態では、第2モードにおいて、第1冷媒と第2冷媒との組成比を段階的に変化させているが、これに限定されるものではない。例えば、第2モードでは、コントローラ110は、主冷媒回路50を流れる冷媒中の第1冷媒と第2冷媒との組成比を、常に所定の(常に同一の)組成比になるよう制御してもよい。 (4-8) Modification H
In the above embodiment, the composition ratio between the first refrigerant and the second refrigerant is changed stepwise in the second mode, but it is not limited to this. For example, in the second mode, the
以上、本開示の実施形態及び変形例を説明したが、特許請求の範囲に記載された本開示の趣旨及び範囲から逸脱することなく、形態や詳細の多様な変更が可能なことが理解されるであろう。 <Appendix>
While embodiments and modifications of the present disclosure have been described above, it will be appreciated that various changes in form and detail are possible without departing from the spirit and scope of the present disclosure as defined in the claims. Will.
40 利用熱交換器
50 主冷媒回路(冷凍サイクル)
70 変更部
100 冷凍サイクル装置
110 コントローラ(制御部)
150 検知部
170 変更部 10
70
150
Claims (14)
- 第1冷媒と第2冷媒とを含む非共沸混合冷媒を用いる冷凍サイクル(50)と、
前記冷凍サイクルを流れる冷媒中の、前記第1冷媒と前記第2冷媒との組成比を変更する変更部(70,170)と、
前記変更部の動作を制御する制御部(110)と、
を備え、
前記制御部は、前記変更部の動作を制御して前記冷凍サイクルに前記第2冷媒を略単独で流す第1モードと、前記変更部の動作を制御して前記冷凍サイクルに前記第1冷媒と前記第2冷媒との混合冷媒を流す第2モードと、を実行する、
冷凍サイクル装置(100)。 a refrigeration cycle (50) using a non-azeotropic refrigerant mixture containing a first refrigerant and a second refrigerant;
a changing unit (70, 170) that changes the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the refrigeration cycle;
a control unit (110) for controlling the operation of the changing unit;
with
The control unit controls the operation of the changing unit to allow the second refrigerant to flow substantially alone in the refrigerating cycle, and controls the operation of the changing unit to supply the first refrigerant to the refrigerating cycle. a second mode in which the mixed refrigerant with the second refrigerant flows;
A refrigeration cycle device (100). - 前記第1モードでは、前記冷凍サイクルに前記第2冷媒の濃度が92wt%以上の冷媒が流される、
請求項1に記載の冷凍サイクル装置。 In the first mode, a refrigerant having a concentration of the second refrigerant of 92 wt% or more is passed through the refrigeration cycle,
The refrigeration cycle apparatus according to claim 1. - 前記第1モードでは、前記冷凍サイクルに前記第2冷媒の濃度が98wt%以上の冷媒が流される、
請求項2に記載の冷凍サイクル装置。 In the first mode, a refrigerant having a concentration of 98 wt% or more of the second refrigerant is flowed through the refrigeration cycle,
The refrigeration cycle apparatus according to claim 2. - 前記冷凍サイクルを流れる冷媒中の、前記第1冷媒と前記第2冷媒との組成比を検知する検知部(150)、を更に備え、
前記制御部は、前記検知部が検知する前記第1冷媒と前記第2冷媒との組成比が目標組成比になるように、前記変更部の動作を制御する、
請求項1から3のいずれか1項に記載の冷凍サイクル装置。 further comprising a detection unit (150) for detecting the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the refrigeration cycle,
The control unit controls the operation of the changing unit so that the composition ratio of the first refrigerant and the second refrigerant detected by the detection unit becomes a target composition ratio.
The refrigeration cycle apparatus according to any one of claims 1 to 3. - 前記第2冷媒の沸点は、前記第1冷媒の沸点より高い、
請求項1から4のいずれか1項に記載の冷凍サイクル装置。 The boiling point of the second refrigerant is higher than the boiling point of the first refrigerant,
The refrigeration cycle apparatus according to any one of claims 1 to 4. - 前記冷凍サイクルは、温度調整対象の温度調整を行う利用熱交換器(40)を含み、
前記利用熱交換器を蒸発器として利用する際に、前記制御部は、前記第1モードを実行し、
前記利用熱交換器を放熱器として利用する際に、前記制御部は、前記第2モードを実行する、
請求項5に記載の冷凍サイクル装置。 The refrigeration cycle includes a utilization heat exchanger (40) that adjusts the temperature of a temperature adjustment target,
When using the utilization heat exchanger as an evaporator, the control unit executes the first mode,
When using the utilization heat exchanger as a radiator, the control unit executes the second mode.
The refrigeration cycle apparatus according to claim 5. - 前記利用熱交換器を前記放熱器として利用する際に、前記制御部は、前記冷凍サイクル装置に対する要求能力に応じて、前記第1モード又は前記第2モードを実行する、
請求項6に記載の冷凍サイクル装置。 When using the utilization heat exchanger as the radiator, the control unit executes the first mode or the second mode according to the required capacity of the refrigeration cycle device.
The refrigeration cycle apparatus according to claim 6. - 前記冷凍サイクルは、圧縮機(10)を含み、
前記制御部は、前記圧縮機の回転数を更に制御し、
前記制御部は、前記第1モードを実行中に、前記圧縮機の回転数を所定の回転数に上げても前記要求能力が得られない場合に、前記第2モードを実行する、
請求項7に記載の冷凍サイクル装置(100)。 The refrigeration cycle includes a compressor (10),
The control unit further controls the rotation speed of the compressor,
The control unit executes the second mode when the required capacity cannot be obtained even if the rotation speed of the compressor is increased to a predetermined rotation speed while the first mode is being executed.
The refrigeration cycle apparatus (100) according to claim 7. - 前記制御部は、前記第2モードを実行する際に、前記変更部の動作を制御して、前記冷凍サイクルを流れる冷媒中の前記第1冷媒と前記第2冷媒との組成比を、第1組成比と、前記第1組成比より前記第1冷媒の比率が高い第2組成比と、の間で変更する、
請求項6又は7に記載の冷凍サイクル装置。 When executing the second mode, the control unit controls the operation of the changing unit to change the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the refrigeration cycle to a first change between the composition ratio and a second composition ratio in which the ratio of the first refrigerant is higher than the first composition ratio;
The refrigeration cycle device according to claim 6 or 7. - 前記冷凍サイクルは、圧縮機(10)を含み、
前記制御部は、前記圧縮機の回転数を更に制御し、
前記制御部は、前記冷凍サイクル装置に対する要求能力の変化に応じて、前記圧縮機の回転数、又は、前記冷凍サイクルを流れる冷媒中の前記第1冷媒と前記第2冷媒との組成比、のいずれかを変更する、
請求項9に記載の冷凍サイクル装置。 The refrigeration cycle includes a compressor (10),
The control unit further controls the rotation speed of the compressor,
The control unit adjusts the rotation speed of the compressor or the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the refrigeration cycle according to changes in the required capacity of the refrigeration cycle device. change any
The refrigeration cycle apparatus according to claim 9. - 前記制御部は、前記要求能力が増大した際に、前記圧縮機の回転数、及び、前記冷凍サイクルを流れる冷媒中の前記第1冷媒と前記第2冷媒との組成比のうち、変更した際の前記圧縮機の電力増加量が少ない方を変更する、
請求項10に記載の冷凍サイクル装置。 When the required capacity increases, the control unit changes the rotation speed of the compressor and the composition ratio of the first refrigerant and the second refrigerant in the refrigerant flowing through the refrigeration cycle. change the one with the smaller power increase amount of the compressor of
The refrigeration cycle device according to claim 10. - 前記制御部は、前記要求能力が低下した際に、前記冷凍サイクルを流れる冷媒中の前記第1冷媒の比率が所定値より高い場合には、前記冷凍サイクルを流れる冷媒中の前記第1冷媒の比率を下げるよう前記変更部を制御し、前記冷凍サイクルを流れる冷媒中の前記第1冷媒の比率が前記所定値以下の場合には、前記圧縮機の回転数を下げる、
請求項10又は11に記載の冷凍サイクル装置。 If the ratio of the first refrigerant in the refrigerant flowing through the refrigerating cycle is higher than a predetermined value when the required capacity is lowered, the control unit controls the amount of the first refrigerant in the refrigerant flowing through the refrigerating cycle. controlling the changing unit to reduce the ratio, and reducing the rotation speed of the compressor when the ratio of the first refrigerant in the refrigerant flowing through the refrigeration cycle is equal to or less than the predetermined value;
The refrigeration cycle apparatus according to claim 10 or 11. - 前記第1冷媒は、CO2であり、
前記第2冷媒は、R1234Ze又はR1234yfである、
請求項1から12のいずれか1項に記載の冷凍サイクル装置。 the first refrigerant is CO2,
The second refrigerant is R1234Ze or R1234yf,
The refrigeration cycle apparatus according to any one of claims 1 to 12. - 前記第1冷媒は、R1132(E)またはR1123であり、
前記第2冷媒は、R1234Ze又はR1234yfである、
請求項1から12のいずれか1項に記載の冷凍サイクル装置。
the first refrigerant is R1132 (E) or R1123,
The second refrigerant is R1234Ze or R1234yf,
The refrigeration cycle apparatus according to any one of claims 1 to 12.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP22781007.4A EP4317849A4 (en) | 2021-03-31 | 2022-03-29 | Refrigeration cycle device |
CN202280026142.8A CN117098959A (en) | 2021-03-31 | 2022-03-29 | Refrigeration cycle device |
US18/374,327 US20240019178A1 (en) | 2021-03-31 | 2023-09-28 | Refrigeration cycle apparatus |
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JP2021-062241 | 2021-03-31 | ||
JP2021062241A JP7216308B2 (en) | 2021-03-31 | 2021-03-31 | refrigeration cycle equipment |
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US18/374,327 Continuation US20240019178A1 (en) | 2021-03-31 | 2023-09-28 | Refrigeration cycle apparatus |
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US (1) | US20240019178A1 (en) |
EP (1) | EP4317849A4 (en) |
JP (2) | JP7216308B2 (en) |
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WO (1) | WO2022210796A1 (en) |
Citations (5)
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JPS62162853A (en) * | 1986-01-10 | 1987-07-18 | 株式会社日立製作所 | Refrigeration cycle |
JPH06337177A (en) * | 1993-03-29 | 1994-12-06 | Toshiba Corp | Refrigerating device |
JP2002039648A (en) * | 2000-07-25 | 2002-02-06 | Mitsubishi Electric Corp | Refrigerant charging method and air conditioner |
JP2004232951A (en) * | 2003-01-30 | 2004-08-19 | Mitsubishi Electric Corp | Refrigerant sealing method |
JP2008281326A (en) | 2007-04-11 | 2008-11-20 | Calsonic Kansei Corp | Refrigerating unit and heat exchanger used for the refrigerating unit |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3128257B1 (en) * | 2014-03-17 | 2020-04-22 | Mitsubishi Electric Corporation | Method for operating a refrigeration cycle device |
JP6567167B2 (en) * | 2016-03-23 | 2019-08-28 | 三菱電機株式会社 | Air conditioner |
-
2021
- 2021-03-31 JP JP2021062241A patent/JP7216308B2/en active Active
-
2022
- 2022-03-29 CN CN202280026142.8A patent/CN117098959A/en active Pending
- 2022-03-29 EP EP22781007.4A patent/EP4317849A4/en active Pending
- 2022-03-29 WO PCT/JP2022/015713 patent/WO2022210796A1/en active Application Filing
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2023
- 2023-01-18 JP JP2023005586A patent/JP2023038281A/en active Pending
- 2023-09-28 US US18/374,327 patent/US20240019178A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS62162853A (en) * | 1986-01-10 | 1987-07-18 | 株式会社日立製作所 | Refrigeration cycle |
JPH06337177A (en) * | 1993-03-29 | 1994-12-06 | Toshiba Corp | Refrigerating device |
JP2002039648A (en) * | 2000-07-25 | 2002-02-06 | Mitsubishi Electric Corp | Refrigerant charging method and air conditioner |
JP2004232951A (en) * | 2003-01-30 | 2004-08-19 | Mitsubishi Electric Corp | Refrigerant sealing method |
JP2008281326A (en) | 2007-04-11 | 2008-11-20 | Calsonic Kansei Corp | Refrigerating unit and heat exchanger used for the refrigerating unit |
Non-Patent Citations (1)
Title |
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See also references of EP4317849A4 |
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Publication number | Publication date |
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EP4317849A4 (en) | 2024-04-17 |
US20240019178A1 (en) | 2024-01-18 |
EP4317849A1 (en) | 2024-02-07 |
CN117098959A (en) | 2023-11-21 |
JP2023038281A (en) | 2023-03-16 |
JP7216308B2 (en) | 2023-02-01 |
JP2022157804A (en) | 2022-10-14 |
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