Refrigerant composition, refrigeration cycle working medium, and refrigeration cycle system

Abstract

To provide a refrigerant composition that contains trifluoroethylene (HFO-1123) and difluoromethane (R32) and has a lower GWP and a sufficiently higher COP compared with R410A.SOLUTION: In a 3-component composition diagram where the sum of trifluoroethylene, difluoromethane, and propane is 100 mass% when x, y, and z are each a mass% of trifluoroethylene, difluoromethane, and propane based on the sum thereof respectively, the coordinate (x, y, z) falls in the range enclosed with segment GH connecting point G and point H, segment HC connecting point H and point C, segment CD connecting point C and point D, segment DE connecting point D and point E, and segment EG connecting point E and point G, or on at least any one segment among segment DE, segment EG, and segment GH (but, excluding point D, point E, and point G) among specific points A-H.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a refrigerant composition containing trifluoroethylene, a refrigerant cycle working medium containing this refrigerant composition, and a refrigerant cycle system.

Background Art

[0002] As a refrigerant composition used in a refrigerant cycle working medium, R410A (refrigerant number based on the Standard 34 (2016) standard of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)) containing difluoromethane (R32) and pentafluoroethane (R125) is known. R410A has a relatively high GWP (Global Warming Potential. The value of GWP used in the present disclosure refers to the global warming potential based on the values in the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC)). Therefore, as an alternative refrigerant to R410A, as disclosed in Patent Document 1, a refrigerant composition containing difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and difluoromethane (R32) and having a relatively low GWP is also known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For a refrigerant composition, for example, it is required to have a low GWP and a high COP (Coefficient of Performance, also referred to as energy consumption efficiency). The refrigerant composition disclosed in Patent Document 1 has a lower GWP than R410A, but its COP is not so high.

[0005] Therefore, the present disclosure aims to obtain a refrigerant composition containing trifluoroethylene (HFO-1123) and difluoromethane (R32) that has a lower GWP and a sufficiently higher COP compared to R410A. [Means for solving the problem]

[0006] Through their research, the inventors of the present invention have confirmed that a refrigerant composition (refrigerant or heat transfer medium) containing trifluoroethylene (HFO-1123), difluoromethane (R32), and propane (R290), with their mass ratios precisely set, exhibits a lower GWP and a higher COP compared to R410A. This disclosure is based on these findings.

[0007] That is, one aspect of the present disclosure is a refrigerant composition comprising trifluoroethylene (HFO-1123), difluoromethane (R32), and propane (R290). When the mass percentages based on the sum of trifluoroethylene, difluoromethane, and propane are denoted as x, y, and z, respectively, in a three-component composition diagram where the sum of trifluoroethylene, difluoromethane, and propane is 100% by mass, the coordinates (x, y, z) are: Point A (100.0, 0.0, 0.0), Point B (0.0, 100.0, 0.0), Point C (0.0, 0.0, 100.0), Point D (74.5, 0.0, 25.5), Point E (62.0, 12.4, 25.6), Point F (91.2, 0. The figure is located within the area enclosed by the line segment GH connecting point G and point H, the line segment HC connecting point H and point C, the line segment CD connecting point C and point D, the line segment DE connecting point D and point E, and the line segment EG connecting point E and point G, or it lies on at least one of the line segments DE, EG, and GH (excluding points D, E, and G). The line segment DE is at coordinates (x, 0.0266x 2 -4.6248x + 196.8859, -0.0266x 2The coordinates are given by (+3.6248x-96.8859). The line segment EF connecting point E and point F is given by coordinates (0.1171z). 2 -5.7627z + 132.8115, -0.1171z 2 It is expressed as +4.7627z-32.8115, z). Furthermore, the line segments GH, HC, and CD are straight lines.

[0008] The refrigerant composition may further contain a halomethane. Furthermore, the mass ratio of difluoromethane when the total sum of trifluoroethylene, difluoromethane, and propane is 100% by mass may be less than 44.4% by mass. Also, the mass ratio of difluoromethane may be less than 29.6% by mass. Furthermore, the mass ratio of difluoromethane may be less than 22.2% by mass. [Effects of the Invention]

[0009] According to each aspect of this disclosure, a refrigerant composition can be obtained that contains trifluoroethylene (HFO-1123) and difluoromethane (R32), and has a lower GWP and a sufficiently higher COP compared to R410A. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a three-component composition diagram of the refrigerant composition according to the first embodiment. [Figure 2] Figure 2 is a three-component composition diagram showing region T of the refrigerant composition according to the first embodiment. [Figure 3] Figure 3 is a three-component composition diagram showing region U of the refrigerant composition according to the first embodiment. [Figure 4] Figure 4 is a three-component composition diagram showing region V of the refrigerant composition according to the first embodiment. [Figure 5] Figure 5 is a block diagram of the refrigeration cycle system according to the first embodiment. [Figure 6] Figure 6 is a block diagram of the refrigeration cycle system according to the second embodiment. [Modes for carrying out the invention]

[0011] The refrigerant composition according to this disclosure contains trifluoroethylene (HFO-1123), difluoromethane (R32), and propane (R290). When the total mass percentage of trifluoroethylene, difluoromethane, and propane is denoted as x, y, and z, respectively, in a three-component composition diagram where the total mass percentage of trifluoroethylene, difluoromethane, and propane is 100% by mass, the coordinates (x, y, z) are: Point A (100.0, 0.0, 0.0), Point B (0.0, 100.0, 0.0), Point C (0.0, 0.0, 100.0), Point D (74.5, 0.0, 25.5), Point E (62.0, 12.4, 25.6), Point F (91.2, 0. The figure is located within the area enclosed by the line segment GH connecting point G and point H, the line segment HC connecting point H and point C, the line segment CD connecting point C and point D, the line segment DE connecting point D and point E, and the line segment EG connecting point E and point G, or it lies on at least one of the line segments DE, EG, and GH (excluding points D, E, and G). The line segment DE is at coordinates (x, 0.0266x 2 -4.6248x + 196.8859, -0.0266x 2 The coordinates are given by (+3.6248x-96.8859). The line segment EF connecting point E and point F is given by coordinates (0.1171z). 2 -5.7627z + 132.8115, -0.1171z 2 It is represented as +4.7627z-32.8115, z). Furthermore, the line segments GH, HC, and CD are straight lines. Hereinafter, the region within the three-component composition diagram of the refrigerant composition determined in this way will also be simply referred to as the "composition region".

[0012] According to the above configuration, by containing trifluoroethylene (HFO-1123), difluoromethane (R32), and propane (R290) in the composition within the above range, a refrigerant composition having a COP equivalent to that of R410A and a lower GWP than R410A can be obtained. Further, this refrigerant composition contains 10% or more of R290, which is a natural refrigerant. For this reason, the content of fluorocarbon-based chemical substances contained in the refrigerant composition can be reduced by 10% by mass or more. Therefore, the impact of fluorocarbon-based chemical substances in the refrigerant composition on the global environment can be reduced.

[0013] This refrigerant composition may further contain halomethane. Thereby, the characteristics of the refrigerant composition can be adjusted by the halomethane. Also, when the total of trifluoroethylene, difluoromethane, and propane is 100% by mass, the mass ratio of difluoromethane may be less than 44.4% by mass as in the above example within the range where the composition of the refrigerant composition is within the above composition region. Thereby, the GWP of the refrigerant composition can be suppressed to a value of less than 300.

[0014] The mass ratio of the difluoromethane may be less than 29.6% by mass. Thereby, the GWP of the refrigerant composition can be suppressed to a value of less than 200. Also, the mass ratio of the difluoromethane may be less than 22.2% by mass. Thereby, the GWP of the refrigerant composition can be suppressed to a value of less than 150.

[0015] The present disclosure also relates to a working medium for a refrigeration cycle containing the above-described refrigerant composition. Thereby, a working medium for a refrigerant cycle having a COP equivalent to that of R410A and a lower GWP than R410A can be obtained. Thus, for example, in the process in which the working medium for the refrigerant cycle circulates in the working medium flow path in the refrigeration cycle system, the working medium can perform work by the energy supplied from the outside and efficiently take heat from the surroundings.

[0016] The present disclosure also relates to a refrigeration cycle system having the above-described working medium for a refrigeration cycle. Thereby, a refrigeration cycle system capable of efficiently refrigerating an object while suppressing the impact on global warming can be realized.

[0017] Hereinafter, each embodiment will be described with reference to the drawings. (First Embodiment) [Refrigeration Cycle Working Medium] The refrigeration cycle working medium according to the first embodiment includes a refrigerant composition and other components that can be used in combination therewith. FIG. 1 is a ternary composition diagram of the refrigerant composition according to the first embodiment. The refrigerant composition includes trifluoroethylene (HFO-1123), difluoromethane (R32), and propane (R290). The mass ratio (%) of this trifluoroethylene (HFO-1123), difluoromethane (R32), and propane (R290) is determined by the composition region represented as region S in FIG. 1. By including trifluoroethylene (HFO-1123) in the refrigerant composition, the GWP of the refrigerant composition can be lowered and the COP can be increased. In addition, by including difluoromethane (R32) in the refrigerant composition, the GWP of the refrigerant composition can be further lowered, and it is easier to adjust the refrigerant composition to have slightly flammable properties. The "slightly flammable" mentioned here refers to flammability that satisfies some or all of the indicators used when determining "A2L" in accordance with the Standard 34 (2016) of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).

[0018] In addition, the refrigerant composition includes propane (R290) in addition to trifluoroethylene (HFO-1123) and difluoromethane (R32), and is strictly set so that the mass ratio of these three components is determined by the composition region, so that it has a lower GWP than R410A and has a sufficiently higher COP performance than R410A. For example, when a refrigerant composition containing only trifluoroethylene (HFO-1123) is used in an air conditioner, the COP of the refrigerant composition remains at about 90% of the COP of R410A. In contrast, the COP of the refrigerant composition of this embodiment has improved to 92.5% or more of the COP of R410A because the refrigerant composition has a composition determined by the composition region. Thus, the refrigerant composition of this embodiment has excellent performance in both COP and GWP.

[0019] Here, Figure 2 is a three-component composition diagram showing region T of the refrigerant composition according to the first embodiment. As shown in Figure 2, as another example, a more desirable region within the composition region is region T on the side of point H when region S is divided into two regions by a line segment IJ connecting point I at coordinates (0.0, 47.0, 53.0) and point J at coordinates (65.0, 0.0, 35.0). Within region T, for example, the volume capacity (capacity per suction volume) ratio of the refrigerant composition of this embodiment to R410 can be set to 100%.

[0020] Figure 3 is a three-component composition diagram showing region U of the refrigerant composition according to the first embodiment. As shown in Figure 3, as another example, among the composition regions, the more desirable region is region U on the side of point C when region S is divided into two regions by the line segment KL connecting point K at coordinates (0.0, 50.0, 50.0) and point L at coordinates (50.0, 0.0, 50.0). Within region U, for example, the solubility of the refrigerant composition of this embodiment in refrigerant oil (ether oil, ester oil, etc.) can be improved.

[0021] Figure 4 is a three-component composition diagram showing region V of the refrigerant composition according to the first embodiment. As shown in Figure 4, as another example, a more desirable region among the composition regions is region V on the side of point C when region S is divided into two regions by a line segment MN connecting point M with coordinates (0.0, 20.0, 80.0) and point N with coordinates (60.0, 40.0, 0.0). Within region V, for example, the difference between the temperature of the refrigerant composition immediately after discharge from the refrigerant compressor (discharge temperature) and the discharge temperature of R410 can be kept within 5K.

[0022] The mass ratio of difluoromethane, when the sum of trifluoroethylene, difluoromethane, and propane is taken as 100% by mass, is less than 44.4% by mass, as an example, within the range in which the composition of the refrigerant composition falls within the aforementioned compositional range. This allows the GWP of the refrigerant composition to be suppressed to a value of less than 300.

[0023] In the first modification of this embodiment, the mass ratio of difluoromethane is less than 29.6% by mass when the total amount of trifluoroethylene, difluoromethane, and propane is 100% by mass. This allows the GWP of the refrigerant composition to be suppressed to a value of less than 200. In the second modification of this embodiment, the mass ratio of difluoromethane is less than 22.2% by mass. This allows the GWP of the refrigerant composition to be suppressed to a value of less than 150.

[0024] Other components included in the refrigeration cycle working fluid may include, for example, compounds other than saturated hydrocarbons having 2 to 5 carbon atoms that can suppress disproportionation reactions. Examples of such other disproportionation inhibitors include halomethanes (halogenated methanes) having the structure shown in Formula 1 below.

[0025] [Formula 1] CHmXn However, in formula (1), X is a halogen atom selected from the group consisting of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I), m is an integer greater than or equal to 0, n is an integer greater than or equal to 1, and furthermore, the sum of n and m is 4, and when n is 2 or greater, X is the same or different types of halogen atoms.

[0026] Examples of such halomethanes include, but are not limited to, one or more of the following: (mono)iodomethane (CH3I), diiodomethane (CH2I2), dibromomethane (CH2Br2), bromomethane (CH3Br), dichloromethane (CH2Cl2), chloroiodomethane (CH2ClI), dibromochloromethane (CHBr2Cl), methane tetraiodide (Cl4), carbon tetrabromethane (CBr4), bromotrichloromethane (CBrCl3), dibromodichloromethane (CBr2Cl2), tribromofluoromethane (CBr3F), fluoroiodomethane (CHFI2), difluorodiiodomethane (CF2I2), dibromodifluoromethane (CBr2F2), and trifluoroiodomethane (CF3I). In the refrigerant composition of this embodiment, halomethanes are not essential components and are added as needed.

[0027] The working fluid for the refrigeration cycle may contain the above-mentioned halomethane or the like as a disproportionation inhibitor to suppress the disproportionation reaction of trifluoroethylene (HFO-1123). This disproportionation reaction includes, for example, a self-decomposition reaction in which trifluoroethylene (HFO-1123) molecules decompose, and a polymerization reaction in which the carbon produced by this self-decomposition reaction polymerizes to form soot. The content of the disproportionation inhibitor in the working fluid for the refrigeration cycle can be set as appropriate.

[0028] The refrigeration cycle working fluid is used in a refrigeration cycle system. For example, the refrigeration cycle working fluid can be used in combination with lubricating oil (refrigerant oil) that lubricates the compressor in the refrigeration cycle system. When the refrigeration cycle working fluid is used in combination with lubricating oil, the working fluid-containing composition consists of a refrigerant composition, a disproportionation inhibitor, lubricating oil components, and other components added as needed. In the working fluid-containing composition, the disproportionation inhibitor may be mixed with either the refrigeration cycle working fluid or the lubricating oil components.

[0029] Examples of lubricants include various known lubricants used in refrigeration cycle systems. Specific examples of lubricants include at least one of the following: ester-based lubricants, ether-based lubricants, glycol-based lubricants, alkylbenzene-based lubricants, fluorine-based lubricants, mineral oils, hydrocarbon-based synthetic oils, etc. The lubricant content of the working fluid for the refrigeration cycle can be set as appropriate, but as an example, it is in the range of greater than 0% by mass and 300% by mass or less.

[0030] Furthermore, the working fluid for the refrigeration cycle may contain various known additives other than disproportionation inhibitors as other components. Specific examples of additives include, but are not limited to, at least one of the following: antioxidants, moisture scavengers, metal deactivators, anti-wear agents, defoamers, ultraviolet fluorescent dyes, stabilizers, polymerization inhibitors, tracers, etc.

[0031] Antioxidants improve the thermal stability, oxidation resistance, and chemical stability of refrigerant compositions or lubricating oils. Moisture scavenging agents remove moisture that has entered the refrigeration cycle system, thereby suppressing changes in properties, for example, of lubricating oil. Metal deactivators suppress or prevent catalytic chemical reactions of metal components in the refrigerant cycle system. Anti-wear agents reduce wear on sliding parts in the compressor and other parts of the refrigeration cycle system. Antifoaming agents suppress the generation of bubbles in lubricating oil, for example. Various additives can be used within a range that does not impair the properties of the working fluid for the refrigeration cycle, or the working fluid-containing composition containing it.

[0032] According to the refrigerant composition, refrigeration cycle working medium containing the refrigerant composition, and working medium-containing composition of this embodiment having the above configuration, an object can be efficiently cooled by externally supplied energy while suppressing the impact on global warming during the process of circulation within the refrigeration circuit in a refrigeration cycle system.

[0033] [Refrigeration cycle system] The following describes a refrigeration cycle system using the working fluid for the refrigeration cycle of this embodiment. The specific configuration and application of the refrigeration cycle system are not particularly limited. For example, a refrigeration cycle system may have a configuration in which components such as a compressor, condenser, expansion means, and evaporator are connected by piping. Examples of refrigeration cycle systems include, but are not limited to, air conditioners, refrigerators (household and commercial), dehumidifiers, display cases, ice makers, heat pump water heaters, heat pump washer-dryers, or vending machines.

[0034] Figure 5 is a block diagram of a refrigeration cycle system 10 according to the first embodiment. The refrigeration cycle system 10 is, for example, an air conditioning system. As shown in Figure 5, the refrigeration cycle system 10 comprises an indoor unit 11, an outdoor unit 12, and piping 13 connecting them. The indoor unit 11 comprises an indoor heat exchanger 14. The outdoor unit 12 comprises an outdoor heat exchanger 15, a compressor 16, and a pressure reducing device 17.

[0035] The indoor heat exchanger 14 and the outdoor heat exchanger 15 are connected by piping 13. Specifically, the indoor heat exchanger 14, compressor 16, outdoor heat exchanger 15, and pressure reducing device 17 are connected in the same order in a ring shape by piping 13, and the working fluid for the refrigeration cycle circulates through them. A four-way valve 18 for switching between heating and cooling is provided in the middle of the piping 13 connecting the indoor heat exchanger 14, compressor 16, and outdoor heat exchanger 15. The indoor unit 11 further includes a blower fan, temperature sensor, control panel, etc. The outdoor unit 12 further includes a blower, accumulator, etc. Various valve devices other than the four-way valve 18 and strainers are provided in the middle of the piping 13 as needed.

[0036] The indoor heat exchanger 14 exchanges heat between indoor air introduced into the indoor unit 11 by a blower fan and the refrigeration cycle working fluid flowing inside the indoor heat exchanger 14. During heating, the indoor unit 11 blows air heated by the heat exchange into the room, and during cooling, it blows air cooled by the heat exchange into the room. The refrigeration cycle working fluid that has passed through the indoor heat exchanger 14 is sent to the outdoor heat exchanger 15. The outdoor heat exchanger 15 exchanges heat between outside air introduced into the outdoor unit 12 by a blower and the refrigeration cycle working fluid flowing inside the outdoor heat exchanger 15. The refrigeration cycle working fluid that has passed through the outdoor heat exchanger 15 is sent back to the indoor heat exchanger 14.

[0037] The specific configuration of the indoor unit 11 and the outdoor unit 12, or the specific configuration of the indoor heat exchanger 14 or outdoor heat exchanger 15, compressor 16, pressure reducing device 17, four-way valve 18, blower fan, temperature sensor, control unit, blower, accumulator, other valve devices, strainer, etc., is not particularly limited.

[0038] During cooling or dehumidification operation of the refrigeration cycle system 10, which is an air conditioning device, the compressor 16 of the outdoor unit 12 compresses the vaporized refrigeration cycle working fluid and discharges it into the piping 13. The vaporized refrigeration cycle working fluid is sent to the outdoor heat exchanger 15 via the four-way valve 18. The outdoor heat exchanger 15 exchanges heat between the vaporized refrigeration cycle working fluid and the outside air. As a result of this heat exchange, the refrigeration cycle working fluid condenses and liquefies. The liquefied refrigeration cycle working fluid flows through the piping 13, is depressurized by the pressure reducing device 17, and sent to the indoor heat exchanger 14. The indoor heat exchanger 14 exchanges heat between the liquefied refrigeration cycle working fluid and the indoor air. As a result of this heat exchange, the refrigeration cycle working fluid evaporates and vaporizes. The vaporized refrigeration cycle working fluid flows through the piping 13 and returns to the compressor 16 via the four-way valve 18.

[0039] Furthermore, during heating operation of the refrigeration cycle system 10, which is an air conditioning device, the compressor 16 of the outdoor unit 12 compresses the vaporized refrigeration cycle working fluid and discharges it into the piping 13. The vaporized refrigeration cycle working fluid is sent to the indoor heat exchanger 14 via the four-way valve 18. The indoor heat exchanger 14 exchanges heat between the vaporized refrigeration cycle working fluid and the indoor air. As a result of this heat exchange, the refrigeration cycle working fluid condenses and liquefies. The liquefied refrigeration cycle working fluid flows through the piping 13, is depressurized by the depressurization device 17 to become a gas-liquid two-phase fluid, and is sent to the outdoor heat exchanger 15. The outdoor heat exchanger 15 exchanges heat between the gas-liquid two-phase refrigeration cycle working fluid and the outside air. As a result of this heat exchange, the gas-liquid two-phase refrigeration cycle working fluid evaporates and vaporizes. The vaporized refrigeration cycle working fluid flows through the piping 13 and returns to the compressor 16 via the four-way valve 18.

[0040] The refrigeration cycle system 10, which operates as described above, includes the aforementioned refrigeration cycle working medium. This refrigeration cycle working medium includes the refrigerant composition of this embodiment. In this embodiment, by using a refrigerant composition that is excellent in GWP and COP, a refrigeration cycle system 10 can be realized that can efficiently freeze objects while suppressing the impact on global warming. The second embodiment will now be described, focusing on the differences from the first embodiment.

[0041] (Second Embodiment) Figure 6 is a block diagram of a refrigeration cycle system 20 according to the second embodiment. The refrigeration cycle system 20 of this embodiment is, for example, a refrigerator. As shown in Figure 6, the refrigeration cycle system 20 includes a compressor 21, a condenser 22, a pressure reducing device 23, an evaporator 24, and piping 25 connecting these, etc. The refrigeration cycle system 20 also includes a housing, a blower, an operating unit, and a control unit, etc., which are not shown. The refrigeration cycle system 20 includes the refrigeration cycle operating medium of the first embodiment.

[0042] The compressor 21 compresses the working fluid for the refrigeration cycle to produce high-temperature, high-pressure vaporized working fluid. The condenser 22 cools the vaporized working fluid to liquefy it. The pressure reducing device 23 reduces the pressure of the liquefied working fluid. The pressure reducing device 23 has, for example, a capillary tube. The evaporator 24 evaporates the working fluid to produce low-temperature, low-pressure vaporized working fluid. The compressor 21, condenser 22, pressure reducing device 23, and evaporator 24 are connected in this order in a ring by piping 25, and the working fluid for the refrigeration cycle circulates. The specific configuration of the compressor 21, condenser 22, pressure reducing device 23, evaporator 24, piping 25, main housing, blower, operating unit, control unit, etc., is not particularly limited.

[0043] When the refrigeration cycle system 20, which is a refrigerator, is in operation, the compressor 21 compresses the vaporized refrigeration cycle working fluid and discharges it to the condenser 22. The condenser 22 cools the vaporized refrigeration cycle working fluid to produce liquefied refrigeration cycle working fluid. The liquefied refrigeration cycle working fluid is depressurized by the depressurization device 23 and sent to the evaporator 24. In the evaporator 24, the liquefied refrigeration cycle working fluid vaporizes by absorbing heat from the surroundings. The vaporized refrigeration cycle working fluid returns to the compressor 21. The same effects as the refrigeration cycle system 10 can be obtained in this type of refrigeration cycle system 20.

[0044] (Confirmation test) Next, a confirmation test for verifying the performance of the refrigerant composition of this disclosure will be described, but this disclosure is not limited to the examples shown below. Those skilled in the art can make various changes, modifications, and alterations without departing from the scope of this disclosure.

[0045] As shown in Table 1 below, refrigerant compositions for Examples 1 to 5 were prepared, each containing trifluoroethylene, difluoromethane, and propane in a predetermined mass ratio (%) when their total sum is 100% by mass. Similarly, as shown in Table 2 below, refrigerant compositions for Comparative Examples 1 to 5 were prepared, each containing trifluoroethylene, difluoromethane, and propane in a predetermined mass ratio (%) when their total sum is 100% by mass. The COP of these refrigerant compositions for Examples 1 to 5 and Comparative Examples 1 to 5 was calculated as a relative value with the COP of R410A set to 100%, using the physical property data from "REFPROP Ver.10," a refrigerant thermophysical property database software created by the National Institute of Standards and Technology (NIST). The calculation conditions were as follows. Evaporation temperature: 5℃ Condensation temperature: 45℃ Superheat degree: 3K Supercooling degree: 5K The calculation results based on the above calculation conditions are shown in Tables 1 and 2.

[0046] [Table 1]

[0047] [Table 2]

[0048] As shown in Table 1, the refrigerant compositions of Examples 1 to 5, which have compositions located within the aforementioned compositional range in the three-component composition diagram shown in Figure 1, were confirmed to have a COP of 92.5% of that of R410A. In contrast, as shown in Table 2, the refrigerant compositions of Comparative Examples 1 to 5, which have compositions outside the aforementioned compositional range, were confirmed to have a COP inferior to that of Examples 1 to 5.

[0049] (Example composition) Next, Table 3 shows examples of compositions on line segment DE (excluding points D and E) within the composition region where the COP of the refrigerant composition of this disclosure is 92.5% of the COP of R410A.

[0050] [Table 3]

[0051] Table 4 also shows examples of compositions on the line segment EG (excluding points E and G) within the composition region in which the COP of the refrigerant composition of this disclosure is 92.5% of the COP of R410A.

[0052] [Table 4]

[0053] This disclosure is not limited to the embodiments described above, and its configuration may be modified, added to, or deleted without departing from the spirit of this disclosure. [Explanation of Symbols]

[0054] 10. Air conditioning system (refrigeration cycle system) 20 Refrigerator (Freezing Cycle System)

Claims

1. In a three-component composition diagram containing trifluoroethylene (HFO-1123), difluoromethane (R32), propane (R290), and halomethane, where x, y, and z are the mass percentages based on the sum of trifluoroethylene, difluoromethane, and propane, respectively, the sum of trifluoroethylene, difluoromethane, and propane is 100% by mass, The coordinates (x, y, z) are Point A (100.0, 0.0, 0.0), Point B (0.0, 100.0, 0.0), Point C (0.0, 0.0, 100.0), Point D (74.5, 0.0, 25.5), Point E (62.0, 12.4, 25.6), Point F (91.2, 0.0, 8.8), Point G (86.9, 3.1, 10.0), Point H (0.0, 90.0, 10.0), Among these, the figure is located within the range enclosed by the line segment GH connecting point G and point H, the line segment HC connecting point H and point C, the line segment CD connecting point C and point D, the line segment DE connecting point D and point E, and the line segment EG connecting point E and point G, or it lies on at least one of the line segments DE, EG, and GH (excluding points D, E, and G). The aforementioned line segment DE is at coordinates (x, 0.0266x ２ -4.6248x+196.8859, -0.0266x ２ It is expressed as +3.6248x - 96.8859, The line segment EF connecting point E and point F is at coordinate (0.1171z). ２ -5.7627z+132.8115, -0.1171z ２ It is expressed as +4.7627z - 32.8115, z), Furthermore, the refrigerant composition wherein the line segment GH, the line segment HC, and the line segment CD are straight lines.

2. The refrigerant composition according to claim 1, wherein the mass ratio of difluoromethane is less than 44.4% by mass when the total sum of trifluoroethylene, difluoromethane, and propane is 100% by mass.

3. The refrigerant composition according to claim 2, wherein the mass ratio of the difluoromethane is less than 29.6% by mass.

4. The refrigerant composition according to claim 3, wherein the mass ratio of the difluoromethane is less than 22.2% by mass.

5. A working medium for a refrigeration cycle comprising the refrigerant composition according to any one of claims 1 to 4.

6. A refrigeration cycle system having the working medium for the refrigeration cycle described in claim 5.

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