Refrigeration cycle apparatus and refrigeration machine oil

Abstract

This disclosure provides a refrigeration cycle device and a refrigeration oil that enable good cooling capacity and coefficient of performance. A refrigeration cycle device uses a working fluid comprising a refrigerant and a refrigeration oil. The refrigerant comprises HFO-1132(E), R32, and HFO-1234yf. The refrigeration cycle device has a compressor and a refrigerant circuit for circulating the working fluid. Regarding the working fluid, the ratio of the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigeration oil to the weight of the refrigeration oil is defined as S (%), the ratio of the weight of the refrigeration oil to the total weight of HFO-1132(E), R32, and HFO-1234yf is defined as Q (%), and the ratio of the weight of HFO-1132(E) to the total weight of HFO-1132(E), R32, and HFO-1234yf is defined as Q (%). Let A (%) be the proportion of the total weight of f, and Sa (%) be the proportion of the weight of HFO-1132(E) dissolved in the refrigeration oil to the weight of the refrigeration oil. Given that 22.5 ≤ A ≤ 42.5, and the weight of R32 relative to the total weight of HFO-1132(E), R32, and HFO-1234yf is greater than 21.0 × A / 28 and less than 22.0 × A / 28, under operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66℃ and the discharge pressure is 2.1 MPa, the value of X, expressed as X = [{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sa+{A / (100-QS)}, satisfies -8.45932 × 10⁻¹⁰. ‑4 ×A 2 +8.71607×10 ‑1 Given that ×A-2.37527≤X, and 22.5≤A≤30.3, then X≤1.12468×10 ‑4 ×A 4 -3.25583×10 ‑3 ×A 3 +3.56792×10 ‑2 ×A 2 -3.18195×10 ‑2 ×A+20.377, at 30.3

Description

Technical Field

[0001] This disclosure relates to refrigeration cycle devices and refrigeration oil. Background Technology

[0002] In recent years, in order to mitigate global warming, research is underway on refrigerants with low Global Warming Potential (GWP) used in refrigeration cycle devices such as air conditioning units.

[0003] For example, in Patent Document 1 (Japanese Patent Application Publication No. 2015-200480), refrigerants with low GWP such as trans-1,2-difluoroethylene (HFO-1132(E)) and propylene-based fluorinated hydrocarbons such as difluoromethane (R32) and 2,3,3,3-tetrafluoropropylene (HFO-1234yf) were proposed as refrigerants. Summary of the Invention

[0004] The problem that the invention aims to solve

[0005] Here, when using a mixed refrigerant containing HFO-1132(E), R32, and HFO-1234yf as the refrigerant, the solubility of HFO-1132(E), R32, and HFO-1234yf differs for the refrigeration oil used as lubricant in the compressor. This indicates that the composition of the refrigerant filling the refrigerant circuit differs from the composition of the refrigerant circulating when performing the refrigeration cycle in the refrigerant circuit.

[0006] Therefore, when using a mixed refrigerant containing HFO-1132(E), R32 and HFO-1234yf with refrigeration oil, it is desirable to achieve good cooling capacity and coefficient of performance.

[0007] Methods for solving problems

[0008] The refrigeration cycle device of the first viewpoint uses a working fluid containing refrigerant and refrigeration oil. The refrigerant includes trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropylene (HFO-1234yf). This refrigeration cycle device includes a refrigerant circuit. The refrigerant circuit has a compressor for circulating the working fluid. Regarding the working fluid, under operating conditions where the refrigerant discharged from the compressor has a discharge temperature of 66°C and a discharge pressure of 2.1 MPa, the value of X, expressed as X=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sa+{A / (100-QS)}, satisfies -8.45932×10 -4 ×A2 +8.71607×10 -1 ×A-2.37527≤X. Further, when 22.5≤A≤30.3, X≤1.12468×10 is satisfied -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377; when 30.3<A≤42.5, X≤56.6 is satisfied. Further, 22.5≤A≤42.5 is satisfied. The weight of R32 relative to the second total weight is 21.0×A / 28 or more and 22.0×A / 28 or less. Here, S(%) is the ratio of the first total weight to the weight of the refrigerating machine oil. The first total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil. Q(%) is the ratio of the weight of the refrigerating machine oil to the second total weight. The second total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf. A(%) is the ratio of the weight of HFO-1132(E) to the second total weight. Sa(%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil.

[0009] Here, the first total weight refers to the total weight of the portions of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit that are dissolved in the refrigerating machine oil, rather than the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit. In addition, the second total weight refers to the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit, and is a value independent of whether or not they are dissolved in the refrigerating machine oil.

[0010] In this refrigeration cycle apparatus, it is possible to ensure that the ratio of refrigeration capacity (refrigeration capacity ratio) is 90% or more, and the ratio of refrigeration capacity refers to the ratio of the refrigeration capacity possessed by the refrigerant that is not dissolved in the refrigerating machine oil and circulates in the refrigerant circuit, relative to the refrigeration capacity that would be possessed by a refrigerant of the charged refrigerant composition circulating in the refrigerant circuit. Further, it is possible to ensure that the ratio of coefficient of performance (coefficient of performance ratio) is 99% or more, and the ratio of coefficient of performance refers to the ratio of the coefficient of performance possessed by the refrigerant that is not dissolved in the refrigerating machine oil and circulates in the refrigerant circuit, relative to the coefficient of performance that would be possessed by a refrigerant of the charged refrigerant composition circulating in the refrigerant circuit.

[0011] The refrigeration cycle device of the second viewpoint is the same as the refrigeration cycle device of the first viewpoint, wherein Sa (%) under operating conditions is 5.7 or more.

[0012] In this refrigeration cycle unit, the lubrication performance of the compressor can be maintained well.

[0013] The refrigeration cycle device of the third viewpoint is the refrigeration cycle device of the first viewpoint or the second viewpoint, wherein, under the above operating conditions, it also satisfies -4.64589×10 -4 ×A 2 +9.34385×10 -1 ×A-1.18947≤X.

[0014] This refrigeration cycle device can ensure a refrigeration capacity ratio of over 95%.

[0015] The refrigeration cycle device of the fourth viewpoint is the refrigeration cycle device of the first viewpoint or the second viewpoint, wherein, under the above operating conditions, A≤X is also satisfied.

[0016] This refrigeration cycle device can ensure a refrigeration capacity ratio of over 100%.

[0017] The refrigeration cycle device of viewpoint 5 uses a working fluid containing refrigerant and refrigeration oil. The refrigerant includes trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropylene (HFO-1234yf). This refrigeration cycle device includes a refrigerant circuit. The refrigerant circuit has a compressor for circulating the working fluid. Regarding the working fluid, under operating conditions where the refrigerant discharged from the compressor has a discharge temperature of 66°C and a discharge pressure of 2.1 MPa, the value of Y, expressed as Y=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sb+{B / (100-QS)}, satisfies -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Y. Furthermore, when 40.0≤B≤53.6, Y≤2.03558×10⁻⁶ is satisfied. -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2×B+36.0237; when 53.6<B≤75.0, Y≤100 is satisfied. Further, 40.0≤B≤75.0 is satisfied. Herein, S(%) is the ratio of the first total weight to the weight of the refrigerating machine oil. The first total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil. Q(%) is the ratio of the weight of the refrigerating machine oil to the second total weight. The second total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf. B(%) is the ratio of the total weight of HFO-1132(E) and R32 to the second total weight. Sb(%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil.

[0018] Herein, the first total weight refers to the total weight of the portions of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit that are dissolved in the refrigerating machine oil, rather than the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit. In addition, the second total weight refers to the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit, which is a value independent of whether or not they are dissolved in the refrigerating machine oil.

[0019] In this refrigeration cycle device, it is possible to ensure that the ratio of refrigeration capacity (refrigeration capacity ratio) is 90% or more, and the ratio of refrigeration capacity refers to the ratio of the refrigeration capacity possessed by the refrigerant that circulates in the refrigerant circuit without being dissolved in the refrigerating machine oil to the refrigeration capacity possessed by the refrigerant of the assumed refrigerant composition charged into the refrigerant circuit when it circulates in the refrigerant circuit. In addition, it is possible to ensure that the ratio of coefficient of performance (coefficient of performance ratio) is 99% or more, and the ratio of coefficient of performance refers to the ratio of the coefficient of performance possessed by the refrigerant that circulates in the refrigerant circuit without being dissolved in the refrigerating machine oil to the coefficient of performance possessed by the refrigerant of the assumed refrigerant composition charged into the refrigerant circuit when it circulates in the refrigerant circuit.

[0020] The refrigeration cycle device according to the sixth aspect is the refrigeration cycle device according to the fifth aspect, wherein under the above operating conditions, -2.62798×10 is further satisfied -4 ×B 2 +9.34385×10 -1 ×B-2.10281≤Y.

[0021] In this refrigeration cycle device, the refrigeration capacity ratio can be ensured to be 95% or more.

[0022] The refrigeration cycle device of the seventh viewpoint is the refrigeration cycle device of the fifth viewpoint, wherein, under the above operating conditions, B≤Y is also satisfied.

[0023] This refrigeration cycle device can ensure a refrigeration capacity ratio of over 100%.

[0024] The refrigeration cycle device of the eighth viewpoint is the refrigeration cycle device described in any one of the first to seventh viewpoints, wherein S(%) under operating conditions is 10 or more.

[0025] In this refrigeration cycle device, the lubrication performance of the compressor can be well maintained when the refrigerant is compressed.

[0026] The refrigeration cycle device of the ninth viewpoint is the refrigeration cycle device described in any one of the views from the first to the eighth viewpoint, wherein the weight proportion of HFO-1132(E) in the refrigerant is 27% to 29%, the weight proportion of R32 in the refrigerant is 20.5% to 22.5%, and the weight proportion of HFO-1234yf in the refrigerant is 49.5% to 51.5%. This refrigeration cycle device also satisfies 20 ≤ Q ≤ 60.

[0027] The refrigeration cycle device of viewpoint 10 uses a working fluid containing refrigerant and refrigeration oil. The refrigerant includes trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropylene (HFO-1234yf). This refrigeration cycle device includes a refrigerant circuit. The refrigerant circuit has a compressor for circulating the working fluid. The compressor includes a compression element for compressing the refrigerant and an oil reservoir for storing the refrigeration oil. Regarding the working fluid, under operating conditions where the refrigerant discharged from the compressor has a discharge temperature of 66°C and a discharge pressure of 2.1 MPa, the value of Xa, expressed as Xa=[{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Ta+{A / (100-RT)}, satisfies -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤Xa. Furthermore, given 22.5≤A≤30.3, Xa≤1.12468×10 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2×A+20.377; when 30.3<A≤42.5, Xa≤56.6 is satisfied. Further, 22.5≤A≤42.5 is satisfied. The weight of R32 is 21.0×A / 28 or more and 22.0×A / 28 or less relative to the second total weight. Here, T(%) is the ratio of the third total weight to the weight of the refrigerating machine oil in the oil reservoir. The third total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil in the oil reservoir. R(%) is the ratio of the weight of the refrigerating machine oil in the oil reservoir to the second total weight. The second total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf. A(%) is the ratio of the weight of HFO-1132(E) to the second total weight. Ta(%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil in the oil reservoir to the weight of the refrigerating machine oil in the oil reservoir.

[0028] Here, the third total weight refers to the total weight of the portion of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit that is dissolved in the refrigerating machine oil in the oil reservoir, rather than the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit. In addition, the second total weight refers to the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit, which is a value independent of whether the refrigerant is dissolved in the refrigerating machine oil or not.

[0029] In this refrigeration cycle apparatus, it is possible to ensure that the ratio of refrigeration capacity (refrigeration capacity ratio) is 90% or more, and the ratio of refrigeration capacity refers to the ratio of the refrigeration capacity possessed by the refrigerant that circulates in the refrigerant circuit without being dissolved in the refrigerating machine oil to the refrigeration capacity that would be possessed by the refrigerant of the refrigerant composition charged into the refrigerant circuit assumed to circulate in the refrigerant circuit. In addition, it is possible to ensure that the ratio of coefficient of performance (coefficient of performance ratio) is 99% or more, and the ratio of coefficient of performance refers to the ratio of the coefficient of performance possessed by the refrigerant that circulates in the refrigerant circuit without being dissolved in the refrigerating machine oil to the coefficient of performance that would be possessed by the refrigerant of the refrigerant composition charged into the refrigerant circuit assumed to circulate in the refrigerant circuit.

[0030] The refrigeration cycle apparatus according to the eleventh aspect is a refrigeration cycle apparatus using a working fluid containing a refrigerant and a refrigerating machine oil, the refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the refrigeration cycle apparatus includes a refrigerant circuit. The refrigerant circuit has a compressor for circulating the working fluid. The compressor includes a compression element that compresses the refrigerant, and an oil reservoir that stores the refrigerating machine oil. Regarding the working fluid, under the operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, the value of Ya represented by Ya=[{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Tb+{B / (100-RT)} satisfies -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Ya. Further, when 40.0≤B≤53.6, Ya≤2.03558×10 -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B+36.0237 is satisfied; when 53.6<B≤75.0, Ya≤100 is satisfied. Further, 40.0≤B≤75.0 is satisfied. Here, T(%) is the ratio of the third total weight to the weight of the refrigerating machine oil in the oil reservoir. The third total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigerating machine oil in the oil reservoir. R(%) is the ratio of the weight of the refrigerating machine oil in the oil reservoir to the second total weight. The second total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf. B(%) is the ratio of the total weight of HFO-1132(E) and R32 to the second total weight. Tb(%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil in the oil reservoir to the weight of the refrigerating machine oil in the oil reservoir.

[0031] Here, the third total weight refers to the total weight of the portion of refrigerant oil dissolved in the oil reservoir of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit, not the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit. Furthermore, the second total weight refers to the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit, and is a value independent of whether or not refrigerant oil is dissolved in it.

[0032] In this refrigeration cycle device, the refrigeration capacity ratio (refrigeration capacity ratio) can be ensured to be 90% or more. This refrigeration capacity ratio refers to the ratio of the refrigeration capacity possessed by the refrigerant circulating in the refrigerant circuit without dissolving in the refrigeration oil to the refrigeration capacity possessed by a refrigerant composed of refrigerant assuming it fills the refrigerant circuit and circulates in the refrigerant circuit. Furthermore, the coefficient of performance (COP) ratio can be ensured to be 99% or more. This COP ratio refers to the ratio of the COP possessed by the refrigerant circulating in the refrigerant circuit without dissolving in the refrigeration oil to the COP possessed by a refrigerant composed of refrigerant assuming it fills the refrigerant circuit and circulates in the refrigerant circuit.

[0033] The refrigeration cycle device of the 12th viewpoint is the refrigeration cycle device of the 10th or 11th viewpoint, wherein T(%) under the above operating conditions is 10 or more.

[0034] In this refrigeration cycle device, the lubrication performance of the compressor can be well maintained when the refrigerant is compressed.

[0035] The refrigeration cycle device of viewpoint 13 is a refrigeration cycle device of any one of views 10 to 12, wherein the weight proportion of HFO-1132(E) in the refrigerant is 27% to 29%, the weight proportion of R32 in the refrigerant is 20.5% to 22.5%, and the weight proportion of HFO-1234yf in the refrigerant is 49.5% to 51.5%. This refrigeration cycle device also satisfies 20 ≤ R ≤ 60.

[0036] The refrigeration cycle device of the 14th viewpoint is the refrigeration cycle device of any one of the 1st to 13th viewpoints, wherein the total weight of the second refrigerant is more than 95%.

[0037] It should be noted that the second total weight of the refrigerant is preferably 99% or more, and more preferably 99.5% or more.

[0038] The refrigeration cycle device according to the fifteenth aspect is the refrigeration cycle device according to any one of the first to fourteenth aspects, wherein the refrigerating machine oil contains at least one selected from the group consisting of polyol ester (POE), polyvinyl ether (PVE), and polyalkylene glycol (PAG).

[0039] The refrigerating machine oil for a refrigeration cycle device according to the sixteenth aspect is a refrigerating machine oil for a refrigeration cycle device that is used as a working fluid together with a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf). The refrigeration cycle device includes a refrigerant circuit. The refrigerant circuit has a compressor for circulating the working fluid. Regarding the working fluid, under operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, the value of X represented by X = [{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sa+{A / (100-QS)} satisfies -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤X. Further, when 22.5≤A≤30.3, X≤1.12468×10 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377 is satisfied; when 30.3<A≤42.5, X≤56.6 is satisfied. Further, 22.5≤A≤42.5 is satisfied. The weight of R32 relative to the second total weight is not less than 21.0×A / 28 and not more than 22.0×A / 28. Here, S (%) is the ratio of the first total weight to the weight of the refrigerating machine oil. The first total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigerating machine oil. Q (%) is the ratio of the weight of the refrigerating machine oil to the second total weight. The second total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf. A (%) is the ratio of the weight of HFO-1132(E) to the second total weight. Sa (%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil.

[0040] Here, the first total weight refers to the total weight of the portion of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit that is dissolved in the refrigerant oil, not the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit. Furthermore, the second total weight refers to the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit, and is a value independent of whether or not it is dissolved in the refrigerant oil.

[0041] According to the refrigeration oil in this refrigeration cycle device, the refrigeration capacity ratio (cooling capacity ratio) can be ensured to be 90% or more. This refrigeration capacity ratio refers to the ratio of the refrigeration capacity possessed by the refrigerant circulating in the refrigerant circuit but not dissolved in the refrigeration oil to the refrigeration capacity possessed by a refrigerant composed of refrigerant assuming it fills the refrigerant circuit and circulates in the refrigerant circuit. Furthermore, the coefficient of performance (COP) ratio can be ensured to be 99% or more. This COP ratio refers to the ratio of the COP possessed by the refrigerant circulating in the refrigerant circuit but not dissolved in the refrigeration oil to the COP possessed by a refrigerant composed of refrigerant assuming it fills the refrigerant circuit and circulates in the refrigerant circuit.

[0042] The refrigeration oil in the refrigeration cycle unit of viewpoint 17 is the refrigeration oil used as the working fluid in a refrigeration cycle unit containing a refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropylene (HFO-1234yf). The refrigeration cycle unit has a refrigerant circuit. The refrigerant circuit has a compressor for circulating the working fluid. Regarding the working fluid, under operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, the value of Y, expressed as Y=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sb+{B / (100-QS)}, satisfies -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Y. Furthermore, when 40.0≤B≤53.6, Y≤2.03558×10⁻⁶ is satisfied. -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2×B+36.0237; in the case of 53.6<B≤75.0, Y≤100 is satisfied. Further, 40.0≤B≤75.0 is satisfied. Herein, S(%) is the ratio of the first total weight to the weight of the refrigerating machine oil. The first total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil. Q(%) is the ratio of the weight of the refrigerating machine oil to the second total weight. The second total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf. B(%) is the ratio of the total weight of HFO-1132(E) and R32 to the second total weight. Sb(%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil.

[0043] Herein, the first total weight refers to the total weight of the portions of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit that are dissolved in the refrigerating machine oil, rather than the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit. In addition, the second total weight refers to the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit, which is a value independent of whether or not they are dissolved in the refrigerating machine oil.

[0044] With the refrigerating machine oil of this refrigeration cycle apparatus, it is possible to ensure that the ratio of refrigeration capacity (refrigeration capacity ratio) is 90% or more, and the ratio of refrigeration capacity refers to the ratio of the refrigeration capacity possessed by the refrigerant that is not dissolved in the refrigerating machine oil and circulates in the refrigerant circuit to the refrigeration capacity possessed by the refrigerant of the assumed refrigerant composition charged into the refrigerant circuit when the refrigerant circulates in the refrigerant circuit. In addition, it is possible to ensure that the ratio of coefficient of performance (coefficient of performance ratio) is 99% or more, and the ratio of coefficient of performance refers to the ratio of the coefficient of performance possessed by the refrigerant that is not dissolved in the refrigerating machine oil and circulates in the refrigerant circuit to the coefficient of performance possessed by the refrigerant of the assumed refrigerant composition charged into the refrigerant circuit when the refrigerant circulates in the refrigerant circuit.

[0045] The refrigerating machine oil for the refrigeration cycle device according to the eighteenth aspect is a refrigerating machine oil for a refrigeration cycle device (1) that is used as a working fluid together with a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32) and 2,3,3,3-tetrafluoropropene (HFO-1234yf). The refrigeration cycle device is provided with a refrigerant circuit. The refrigerant circuit has a compressor for circulating the working fluid. The compressor includes a compression element that compresses the refrigerant and an oil reservoir that stores the refrigerating machine oil. Regarding the working fluid, under operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, the value of Xa represented by Xa = [{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Ta+{A / (100-RT)} satisfies -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤Xa. Further, when 22.5≤A≤30.3, Xa≤1.12468×10 is satisfied -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377; when 30.3<A≤42.5, Xa≤56.6 is satisfied. Further, 22.5≤A≤42.5 is satisfied. The weight of R32 relative to the second total weight is 21.0×A / 28 or more and 22.0×A / 28 or less. Here, T(%) is the ratio of the third total weight to the weight of the refrigerating machine oil in the oil reservoir. The third total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil in the oil reservoir. R(%) is the ratio of the weight of the refrigerating machine oil in the oil reservoir to the second total weight. The second total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf. A(%) is the ratio of the weight of HFO-1132(E) to the second total weight. Ta(%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil in the oil reservoir to the weight of the refrigerating machine oil in the oil reservoir.

[0046] Here, the third total weight refers to the total weight of the portion of refrigerant oil dissolved in the oil reservoir of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit, not the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit. Furthermore, the second total weight refers to the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit, and is a value independent of whether or not refrigerant oil is dissolved in it.

[0047] According to the refrigeration oil in this refrigeration cycle device, the refrigeration capacity ratio (cooling capacity ratio) can be ensured to be 90% or more. This refrigeration capacity ratio refers to the ratio of the refrigeration capacity possessed by the refrigerant circulating in the refrigerant circuit but not dissolved in the refrigeration oil to the refrigeration capacity possessed by a refrigerant composed of refrigerant assuming it fills the refrigerant circuit and circulates in the refrigerant circuit. Furthermore, the coefficient of performance (COP) ratio can be ensured to be 99% or more. This COP ratio refers to the ratio of the COP possessed by the refrigerant circulating in the refrigerant circuit but not dissolved in the refrigeration oil to the COP possessed by a refrigerant composed of refrigerant assuming it fills the refrigerant circuit and circulates in the refrigerant circuit.

[0048] The refrigeration oil of the refrigeration cycle device in viewpoint 19 is the refrigeration oil of the refrigeration cycle device (1) used as the working fluid together with a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32) and 2,3,3,3-tetrafluoropropylene (HFO-1234yf). The refrigeration cycle device has a refrigerant circuit. The refrigerant circuit has a compressor for circulating the working fluid. The compressor includes a compression element for compressing the refrigerant and an oil reservoir for storing the refrigeration oil. Regarding the working fluid, under operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, the value of Ya, expressed by Ya=[{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Tb+{B / (100-RT)}, satisfies -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Ya. Furthermore, given 40.0≤B≤53.6, Ya≤2.03558×10⁻⁶ is satisfied. -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2×B+36.0237; in the case of 53.6<B≤75.0, Ya≤100 is satisfied. Further, 40.0≤B≤75.0 is satisfied. Here, T(%) is the ratio of the third total weight to the weight of the refrigerating machine oil in the oil reservoir. The third total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil in the oil reservoir. R(%) is the ratio of the weight of the refrigerating machine oil in the oil reservoir to the second total weight. The second total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf. B(%) is the ratio of the total weight of HFO-1132(E) and R32 to the second total weight. Tb(%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil in the oil reservoir to the weight of the refrigerating machine oil in the oil reservoir.

[0049] Here, the third total weight refers to the total weight of the portion of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit that is dissolved in the refrigerating machine oil in the oil reservoir, rather than the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit. In addition, the second total weight refers to the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit, which is a value independent of whether or not they are dissolved in the refrigerating machine oil.

[0050] With the refrigerating machine oil of this refrigeration cycle apparatus, it is possible to ensure that the ratio of refrigeration capacity (refrigeration capacity ratio) is 90% or more, and the ratio of refrigeration capacity refers to the ratio of the refrigeration capacity possessed by the refrigerant that is not dissolved in the refrigerating machine oil and circulates in the refrigerant circuit to the refrigeration capacity possessed by the refrigerant of the refrigerant composition assumed to be charged into the refrigerant circuit when it circulates in the refrigerant circuit. In addition, it is possible to ensure that the ratio of coefficient of performance (coefficient of performance ratio) is 99% or more, and the ratio of coefficient of performance refers to the ratio of the coefficient of performance possessed by the refrigerant that is not dissolved in the refrigerating machine oil and circulates in the refrigerant circuit to the coefficient of performance possessed by the refrigerant of the refrigerant composition assumed to be charged into the refrigerant circuit when it circulates in the refrigerant circuit. Brief Description of the Drawings

[0051] Figure 1 is a schematic configuration diagram of a refrigeration cycle apparatus.

[0052] Figure 2 is a schematic cross-sectional configuration diagram of a compressor.

[0053] Figure 3 is a graph showing a line formed by connecting the plotted points of aQS with respect to Q.

[0054] Figure 4This is a graph showing the approximation of aQS with respect to Q.

[0055] Figure 5 It is a graph showing the relationship between X and A.

[0056] Figure 6 It is a graph showing the value of X against Sa for each Q.

[0057] Figure 7 It is a graph showing the relationship between Y and B.

[0058] Figure 8 It is a graph showing the value of Y against Sb for each Q. Detailed Implementation

[0059] The following describes embodiments of the refrigeration cycle device and the refrigeration oil of the refrigeration cycle device disclosed herein.

[0060] (1) Refrigeration cycle device

[0061] The refrigeration cycle device 1 of this embodiment handles the heat load by performing a vapor compression refrigeration cycle. The refrigeration cycle device 1 includes a refrigerant circuit 10.

[0062] The refrigerant circuit 10 has a compressor 2, a first heat exchanger 3, an expansion valve 4, a second heat exchanger 5, and is sealed with a working fluid containing refrigerant and refrigeration oil.

[0063] Compressor 2, first heat exchanger 3, expansion valve 4, and second heat exchanger 5 are sequentially connected in refrigerant circuit 10 via refrigerant piping. Refrigerant circuit 10 includes a switching valve 6, which switches between a first operating state and a second operating state. In the first operating state, the first heat exchanger 3 functions as a refrigerant radiator, and the second heat exchanger 5 functions as a refrigerant evaporator. In the second operating state, the first heat exchanger 3 functions as a refrigerant evaporator, and the second heat exchanger 5 functions as a refrigerant radiator. The first operating state is, for example, a cooling operation, and the second operating state is, for example, a heating operation.

[0064] The compressor 2 is a positive displacement compressor or the like, driven by a compressor electric motor, and has a compression element 21 and an oil reservoir 37. The compressor electric motor may also be driven by receiving power from an inverter device (not shown).

[0065] Expansion valve 4, for example, can adjust the valve opening, thereby adjusting the pressure of the refrigerant passing through.

[0066] It should be noted that the refrigeration cycle unit 1 includes a microcomputer, a memory, and a control unit 7 for driving and controlling various actuators. The control unit 7 can control the operating status of the compressor 2, the valve opening degree of the expansion valve 4, etc.

[0067] The refrigeration cycle device 1 is not particularly limited, and examples include indoor air conditioners, cabinet air conditioners, refrigerators, automotive air conditioners, water heaters, dehumidifiers, refrigerated storage rooms, refrigerated warehouses, vending machines, display cases, cooling devices in chemical plants, etc.

[0068] (2) Compressor

[0069] There are no particular limitations on compressor 2; for example, various compressors such as scroll compressors and rotary compressors can be used.

[0070] Here, with Figure 2 The scroll compressor shown is used as an example for illustration.

[0071] The compressor 2 includes a housing 20, a compression element 21, a drive motor 24, a crankshaft 25, a lower bearing 26, a counterweight 30, and an oil reservoir 37.

[0072] The housing 20 has a generally cylindrical component 20a with openings at the top and bottom, and an upper cover 20b and a lower cover 20c respectively disposed at the upper and lower ends of the cylindrical component 20a. The housing 20 houses the compressor 2, which includes a compressor element 21, a drive motor 24, a crankshaft 25, and a lower bearing 26. An oil reservoir 37 is formed from the lower end of the interior of the housing 20 to a predetermined height. The oil reservoir 37 has an oil storage space 37a for storing refrigerant oil used to lubricate the compressor element 21, etc. An oil temperature sensor 38 for detecting the temperature of the stored refrigerant oil is provided in the oil reservoir 37. At the upper part of the housing 20, a suction pipe 12, which draws in low-pressure gaseous refrigerant from the refrigerant circuit 10 and supplies gaseous refrigerant to the compressor element 21, passes through the upper cover 20b. The lower end of the suction pipe 12 is connected to the fixed scroll member 22 of the compressor element 21. The suction pipe 12 communicates with the compression chamber Sc of the compressor element 21. A discharge pipe 13 is provided in the middle of the cylindrical component 20a of the outer casing 20 for the refrigerant to be discharged to the outside of the outer casing 20. The end of the discharge pipe 13 inside the outer casing 20 is configured to protrude into the high-pressure space Sh formed below the housing 27 of the compression element 21. The high-pressure refrigerant in the refrigeration cycle, compressed by the compression element 21, flows in the discharge pipe 13.

[0073] The compression element 21 mainly has a housing 27, a fixed scroll member 22 disposed above the housing 27, and a movable scroll member 23 that is combined with the fixed scroll member 22 to form a compression chamber Sc.

[0074] The fixed scroll member 22 has a flat fixed side end plate 22a, a scroll-shaped fixed side scroll tooth 22b protruding downward from the lower surface of the fixed side end plate 22a, and an outer edge portion 22c surrounding the fixed side scroll tooth 22b. At the center of the fixed side end plate 22a, a non-circular discharge port 22d, communicating with the compression chamber Sc of the compression element 21, is formed penetrating through the fixed side end plate 22a in the thickness direction. The refrigerant compressed in the compression chamber Sc is discharged from the discharge port 22d and flows into the high-pressure space Sh through a refrigerant passage (not shown) formed in the fixed scroll member 22 and the housing 27. It should be noted that this compressor 2 is a high-pressure dome-shaped compressor in which high-pressure refrigerant exists in the region outside the compression element 21 within the housing 20.

[0075] The movable scroll member 23 has a flat movable side end plate 23a, a scroll-shaped movable side scroll tooth 23b protruding upward from the upper surface of the movable side end plate 23a, and a cylindrical boss portion 23c protruding from the back of the movable side end plate 23a. The fixed side scroll tooth 22b of the fixed scroll member 22 and the movable side scroll tooth 23b of the movable scroll member 23 are combined in a state where the lower surface of the fixed side end plate 22a faces the upper surface of the movable side end plate 23a. A compression chamber Sc is formed between adjacent fixed side scroll teeth 22b and movable side scroll teeth 23b. As the movable scroll member 23 revolves relative to the fixed scroll member 22 as described later, the volume of the compression chamber Sc changes periodically, and refrigerant is drawn in, compressed, and discharged in the compression element 21. The boss portion 23c is a cylindrical portion with its upper end sealed. The movable scroll member 23 is connected to the crankshaft 25 by inserting the eccentric portion 25b of the crankshaft 25 (described later) into the hollow portion of the boss portion 23c. An eccentric space 28 is defined by the boss portion 23c and the housing 27. The eccentric space 28 is connected to the high-pressure space Sh via the oil supply path 39 of the crankshaft 25 (described later), and high pressure acts on the eccentric space 28. This pressure presses the lower surface of the movable side plate 23a within the eccentric space 28 upwards toward the fixed scroll member 22. This force causes the movable scroll member 23 to be tightly fitted with the fixed scroll member 22. The movable scroll member 23 is supported on the housing 27 via a cross ring 29 disposed in the "cross ring space Sr". The cross ring 29 is a component that prevents the movable scroll member 23 from rotating and causes it to revolve. By using the cross ring 29, when the crankshaft 25 rotates, the movable scroll member 23 connected to the crankshaft 25 in the boss portion 23c revolves relative to the fixed scroll member 22 without rotating on its own, and the refrigerant in the compression chamber Sc is compressed.

[0076] The housing 27 is pressed into the inner side of the cylindrical member 20a and is fixed to the cylindrical member 20a circumferentially over its entire outer periphery. Furthermore, the housing 27 and the fixed scroll member 22 are fixed in such a way that the upper end face of the housing 27 is in close contact with the lower surface of the outer edge 22c of the fixed scroll member 22. The housing 27 has a recess 27a disposed in the center of its upper surface and an upper bearing portion 27b disposed below the recess 27a. The side of the eccentric space 28 is divided by the inner side of the recess 27a. An upper bearing 35, a cylindrical metal member that supports the main shaft 25a of the crankshaft 25, is disposed in the upper bearing portion 27b. The upper bearing 35 supports the main shaft 25a, into which it is inserted, allowing for free rotation. Additionally, a cross-ring space Sr is formed in the housing 27, in which a cross-ring 29 is disposed.

[0077] The drive motor 24 has an annular stator 33 fixed to the inner wall of the cylindrical member 20a, and a rotor 32 rotatably housed inside the stator 33 through a small gap (air gap passage). The stator 33 is configured to have coils. The rotor 32 is connected to the movable scroll member 23 via a crankshaft 25 arranged to extend vertically along the axis of the cylindrical member 20a. As the rotor 32 rotates, the movable scroll member 23 revolves relative to the fixed scroll member 22.

[0078] The crankshaft 25 transmits the driving force of the drive motor 24 to the movable scroll member 23. The crankshaft 25 is configured to extend vertically along the axis of the cylindrical member 20a, connecting the rotor 32 of the drive motor 24 to the movable scroll member 23 of the compression element 21. The crankshaft 25 has a main shaft 25a whose central axis coincides with the axis of the cylindrical member 20a, and an eccentric portion 25b that is eccentric relative to the axis of the cylindrical member 20a. As described above, the eccentric portion 25b is inserted into the boss portion 23c of the movable scroll member 23. It should be noted that a cylindrical metal component, namely a pin bearing 31, is provided radially outside the eccentric portion 25b to provide shaft support for it. The main shaft 25a is supported by the pin bearing 31, the upper bearing 35 of the upper bearing portion 27b of the housing 27, and the lower bearing 26, allowing it to rotate freely. The main shaft 25a is connected to the rotor 32 of the drive motor 24 between the upper bearing 35 and the lower bearing 26. An oil supply path 39 for supplying refrigerant oil to the compression element 21 and the like is formed inside the crankshaft 25. The lower end of the main shaft 25a is located within the oil storage space 37a of the oil reservoir 37 formed in the lower part of the housing 20, and the refrigerant oil in the oil storage space 37a is supplied to the compression element 21 and the like through the oil supply path 39.

[0079] The counterweight 30, distinct from the crankshaft 25, is ring-shaped and embedded in the main shaft 25a. The counterweight 30 has a cylindrical portion 30a and an eccentric portion 30b formed on a circumferential part of the cylindrical portion 30a. The center of gravity of the counterweight 30 as a whole is eccentrically offset from the axis of the crankshaft 25 in a predetermined direction. The movable scroll member 23 is supported near its center by the eccentric portion 25b of the crankshaft 25, allowing it to slide freely. Consequently, the movable scroll member 23 is also eccentrically offset in the same direction as the eccentric portion 25b.

[0080] The lower bearing 26 is positioned below the drive motor 24. The lower bearing 26 is fixed to the lower inner side of the cylindrical component 20a. The lower bearing 26 constitutes the bearing on the lower end side of the crankshaft 25 and is a metal component that supports the main shaft 25a of the crankshaft 25 in a freely rotatable cylindrical shape.

[0081] The compressor 2 described above operates as follows.

[0082] First, when the drive motor 24 starts, the rotor 32 rotates relative to the stator 33, and the crankshaft 25, which is fixed to the rotor 32, rotates. As the crankshaft 25 rotates, the movable scroll member 23, connected to the crankshaft 25, revolves relative to the fixed scroll member 22. Furthermore, low-pressure gaseous refrigerant in the refrigeration cycle is drawn into the compression chamber Sc from the periphery through the suction pipe 12. As the movable scroll member 23 revolves, the suction pipe 12 becomes disconnected from the compression chamber Sc. And, as the volume of the compression chamber Sc decreases, the pressure in the compression chamber Sc begins to rise.

[0083] The refrigerant in the compression chamber Sc is compressed as the volume of the compression chamber Sc decreases, eventually becoming a high-pressure gaseous refrigerant. This high-pressure gaseous refrigerant is discharged from the outlet 22d located near the center of the fixed side end plate 22a. Then, the high-pressure gaseous refrigerant flows into the high-pressure space Sh through a refrigerant passage (not shown) formed in the fixed scroll member 22 and the housing 27. The high-pressure gaseous refrigerant in the refrigeration cycle, compressed by the compression element 21, flowing into the high-pressure space Sh, is discharged from the outlet pipe 13.

[0084] (3) Refrigeration oil

[0085] In the refrigerant circuit 10, refrigeration oil is sealed in along with the refrigerant.

[0086] As a refrigeration oil used with refrigerant, known refrigeration oils can be used. Preferably, at least one or more of the following are selected from the group consisting of polyol esters (POE), polyvinyl ether (PVE), and polyalkylene glycols (PAG).

[0087] Refrigeration oil may contain, for example, known acid scavengers, extreme pressure agents, and antioxidants.

[0088] It should be noted that there are no particular limitations on the solubility of HFO-1132(E), R32, and HFO-1234yf in refrigeration oils. For example, the solubility can be adjusted by modifying the molecular structure of the organic compounds contained in the refrigeration oil, such as the number of carbon atoms and the presence or absence of branched chains. For instance, when the refrigeration oil contains polyol esters, the solubility of HFO-1132(E), R32, and HFO-1234yf can be adjusted by changing the number of carbon atoms and the branched structure of the carbon chains of the fatty acids constituting the polyol esters, as well as the number of carbon atoms, the number of hydroxyl groups, and the branched structure of the carbon chains of the polyols constituting the polyol esters. Furthermore, when the refrigeration oil contains polyvinyl ether, the solubility of HFO-1132(E), R32, and HFO-1234yf can be adjusted by changing the number of carbon atoms, the branched structure, and the functional groups of the side chains constituting the polyol ethers. Furthermore, when the refrigeration oil contains polyalkylene glycols, the solubility of HFO-1132(E), R32, and HFO-1234yf can be adjusted by changing the ratio of propylene oxide to ethylene oxide in the polyalkylene glycol. These polyol esters, polyvinyl ethers, and polyalkylene glycols can be, for example, substances known as refrigeration oils or commercially available substances.

[0089] (4) Refrigerant

[0090] The refrigerants used in the refrigeration cycle unit 1 include trans-1,2-difluoroethylene (HFO-1132(E), R32 and 2,3,3,3-tetrafluoropropylene (HFO-1234yf).

[0091] It should be noted that the content of HFO-1132(E), R32 and HFO-1234yf in the refrigerant is preferably 95% by weight or more, more preferably 99% by weight or more, and even more preferably 99.5% by weight or more.

[0092] It should be noted that, preferably, the weight percentage of HFO-1132(E) in the refrigerant is 27% to 29%, the weight percentage of R32 in the refrigerant is 20.5% to 22.5%, and the weight percentage of HFO-1234yf in the refrigerant is 49.5% to 51.5%.

[0093] (5) Relationship between refrigerant and refrigeration oil

[0094] (5-1) Regarding the refrigeration oil in the overall refrigerant circuit

[0095] (5-1-1) Regarding the case based on the weight ratio of HFO-1132(E)

[0096] In the present embodiment, regarding a working fluid containing a refrigerant and a refrigerating machine oil, 22.5 ≤ A ≤ 42.5, and the weight of R32 relative to the second total weight is 21.0×A / 28 or more and 22.0×A / 28 or less. Here, the second total weight is the total weight of HFO-1132(E), R32 and HFO-1234yf. Further, regarding the working fluid, under the operating conditions where the discharge temperature of the refrigerant discharged from the compressor 2 is 66°C and the discharge pressure is 2.1 MPa, the value of X represented by X = [{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sa+{A / (100-QS)} satisfies -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤X. Here, when 22.5 ≤ A ≤ 30.3, X ≤ 1.12468×10 is satisfied -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377. In addition, when 30.3 < A ≤ 42.5, X ≤ 56.6 is satisfied.

[0097] Here, S(%) is the ratio of the first total weight, which is the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil, relative to the weight of the refrigerating machine oil. It should be noted that the first total weight refers to the total weight of the portions of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit 10 that are dissolved in the refrigerating machine oil, not the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit 10.

[0098] Q(%) is the ratio of the weight of the refrigerating machine oil relative to the second total weight which is the total weight of HFO-1132(E), R32 and HFO-1234yf. It should be noted that the second total weight refers to the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit 10, and is a value independent of whether or not they are dissolved in the refrigerating machine oil.

[0099] A(%) is the ratio of the weight of HFO-1132(E) relative to the second total weight.

[0100] Sa(%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigeration oil to the weight of the refrigeration oil.

[0101] It should be noted that in this instruction manual, "·" and "×" are sometimes used. Both "·" and "×" refer to the product.

[0102] According to this refrigeration cycle device 1, it is possible to ensure that the refrigeration capacity ratio (refrigeration capacity ratio) is 90% or more. This refrigeration capacity ratio refers to the ratio of the refrigeration capacity possessed by the refrigerant circulating in the refrigerant circuit 10 without dissolving in the refrigeration oil to the refrigeration capacity possessed by a refrigerant assuming it is filled in the refrigerant circuit 10 and circulating in the refrigerant circuit 10. Furthermore, it is possible to ensure that the coefficient of performance (COP) ratio (COP) is 99% or more. This COP ratio refers to the ratio of the COP possessed by the refrigerant circulating in the refrigerant circuit 10 without dissolving in the refrigeration oil to the COP possessed by a refrigerant assuming it is filled in the refrigerant circuit 10 and circulating in the refrigerant circuit.

[0103] It should be noted that the weight of R32 relative to the total weight of the second component is between 21.0×A / 28 and 22.0×A / 28, which is a relatively narrow range. Therefore, within this range, even if the ratio of R32 to HFO-1132(E) changes slightly, the cooling capacity and coefficient of performance are essentially the same.

[0104] In addition, since A is above 22.5, it is easy to ensure cooling capacity, and since A is below 42.5, it is possible to suppress refrigerant combustion even in the event of a leak.

[0105] It should be noted that, from the viewpoint of ensuring a cooling capacity ratio of over 95%, under the above operating conditions of a refrigerant discharge temperature of 66°C and a discharge pressure of 2.1 MPa, it is preferable to further satisfy -4.64589×10 -4 ×A 2 +9.34385×10 -1 ×A-1.18947≤X.

[0106] Furthermore, from the viewpoint of ensuring a cooling capacity ratio of over 100%, under the aforementioned operating conditions of a refrigerant discharge temperature of 66°C and a discharge pressure of 2.1 MPa, it is preferable to further satisfy A≤X.

[0107] The refrigerant and refrigerating machine oil used in the refrigeration cycle device 1 are particularly preferably such that the weight proportion of HFO-1132(E) in the refrigerant is 27% or more and 29% or less, the weight proportion of R32 in the refrigerant is 20.5% or more and 22.5% or less, the weight proportion of HFO-1234yf in the refrigerant is 49.5% or more and 51.5% or less, and 20 ≤ Q ≤ 60 is satisfied.

[0108] Here, from the viewpoint of favorably maintaining the lubricating performance in the compressor 2 when the refrigerant is compressed, it is preferable that S (%) under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa is 10 or more.

[0109] In addition, from the viewpoint of favorably maintaining the lubricating performance in the compressor 2 when the refrigerant is compressed, it is preferable that Sa (%) under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa is 5.7 or more.

[0110] (5-1-2) Regarding the case based on the total weight proportion of HFO-1132(E) and R32

[0111] In the present embodiment, regarding the working fluid containing the refrigerant and the refrigerating machine oil, 40.0 ≤ B ≤ 75.0. Further, regarding the working fluid, under the operating conditions where the discharge temperature of the refrigerant discharged from the compressor 2 is 66°C and the discharge pressure is 2.1 MPa, the value of Y represented by Y = [{(-1.3257S + 1.0919) / (Q + 233.27S - 207.91)} + 1]Sb + {B / (100 - QS)} satisfies -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B - 4.19914 ≤ Y. Here, in the case of 40.0 ≤ B ≤ 53.6, Y ≤ 2.03558×10 is satisfied -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B + 36.0237. In addition, in the case of 53.6 < B ≤ 75.0, Y ≤ 100 is satisfied.

[0112] Here, similarly to (5-1-1), S (%) is the ratio of the first total weight to the weight of the refrigerating machine oil.

[0113] Similarly to (5-1-1), Q (%) is the ratio of the weight of the refrigerating machine oil to the second total weight.

[0114] B(%) is the ratio of the total weight of HFO-1132(E) and R32 to the second total weight.

[0115] Sb(%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigeration oil to the weight of the refrigeration oil.

[0116] According to this refrigeration cycle device 1, it is possible to ensure that the refrigeration capacity ratio (refrigeration capacity ratio) is 90% or more. This refrigeration capacity ratio refers to the ratio of the refrigeration capacity possessed by the refrigerant circulating in the refrigerant circuit 10 without dissolving in the refrigeration oil to the refrigeration capacity possessed by a refrigerant assuming it is filled in the refrigerant circuit 10 and circulating in the refrigerant circuit 10. Furthermore, it is possible to ensure that the coefficient of performance (COP) ratio (COP) is 99% or more. This COP ratio refers to the ratio of the COP possessed by the refrigerant circulating in the refrigerant circuit 10 without dissolving in the refrigeration oil to the COP possessed by a refrigerant assuming it is filled in the refrigerant circuit 10 and circulating in the refrigerant circuit.

[0117] In addition, since B is above 40, it is easy to ensure cooling capacity, and since B is below 75, it is possible to suppress refrigerant combustion even in the event of a leak.

[0118] Furthermore, from the viewpoint of ensuring a cooling capacity ratio of 95% or higher, under the aforementioned operating conditions of a refrigerant discharge temperature of 66°C and a discharge pressure of 2.1 MPa, it is preferable to further satisfy -2.62798 × 10 -4 ×B 2 +9.34385×10 -1 ×B-2.10281≤Y.

[0119] Furthermore, from the viewpoint of ensuring a cooling capacity ratio of over 100%, under the aforementioned operating conditions of a refrigerant discharge temperature of 66°C and a discharge pressure of 2.1 MPa, it is preferable to further satisfy B≤Y.

[0120] The refrigerant and refrigeration oil used in the refrigeration cycle unit 1 are particularly preferably those in which the weight proportion of HFO-1132(E) in the refrigerant is 27% or more and 29% or less, the weight proportion of R32 in the refrigerant is 20.5% or more and 22.5% or less, and the weight proportion of HFO-1234yf in the refrigerant is 49.5% or more and 51.5% or less, and satisfy 20≤Q≤60.

[0121] Here, from the viewpoint of maintaining good lubrication performance in compressor 2 when refrigerant is compressed, it is preferable that S(%) is 10 or more under the above operating conditions of refrigerant discharge temperature of 66°C and discharge pressure of 2.1 MPa.

[0122] (Experimental Example 1)

[0123] By determining the weight percentage (%) of HFO-1132(E) in the refrigerant filled in the refrigerant circuit 10 and circulating in the refrigerant that is not dissolved in the refrigeration oil, the conditions for ensuring a cooling capacity ratio of 90% or higher and a coefficient of performance ratio of 99% or higher were established. Furthermore, conditions for ensuring a cooling capacity ratio of 95% or higher and a coefficient of performance ratio of 99% or higher, as well as conditions for ensuring a cooling capacity ratio of 100% or higher and a coefficient of performance ratio of 99% or higher, were also established.

[0124] It should be noted that the weight percentage (%) of HFO-1234yf in the circulating refrigerant that is not dissolved in the refrigeration oil is the value obtained by subtracting the combined weight percentage (%) of HFO-1132(E) and R32 from 100(%).

[0125] Specifically, in addition to S, Q, A, and Sa mentioned above, the following parameters are also used. It should be noted that, in the following text, S(%) is the ratio of the weight of the refrigerant dissolved in the refrigerant oil in refrigerant circuit 10 to the weight of the refrigerant oil; Q(%) is the ratio of the weight of the refrigerant oil in refrigerant circuit 10 to the weight of the refrigerant; A(%) is the ratio of the weight of HFO-1132(E) in refrigerant circuit 10 to the weight of the refrigerant; and Sa(%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigerant oil in refrigerant circuit 10 to the weight of the refrigerant oil.

[0126] The composition of the refrigerant filling the refrigerant circuit 10 is set as HFO-1132(E) / R32 / HFO-1234yf=A / A' / F(wt%). Here, A is the same as above.

[0127] The weight of the refrigerant filled in refrigerant circuit 10, i.e., the refrigerant filling amount, is denoted as Wr (g). Therefore, the weight of HFO-1132(E) filled in refrigerant circuit 10 is expressed as Wr·A (g). Additionally, the weight of HFO-1234yf filled in refrigerant circuit 10 is expressed as Wr·F (g). It should be noted that the weight of R32 filled in refrigerant circuit 10 and the weight of HFO-1132(E) are used under a certain relationship, therefore set as Wr·A' (g) = Wr·(A·21.5 / 28)(g).

[0128] The weight of the refrigeration oil filled in the refrigerant circuit 10, i.e. the oil quantity, is set as Wo (g).

[0129] The ratio of the weight of R32 dissolved in the refrigerant circuit 10 to the weight of the refrigerant oil is set as Sa', and is expressed as Sa'=Sa·(21.5 / 28).

[0130] The ratio of the weight of HFO-1234yf dissolved in the refrigerant circuit 10 to the weight of the refrigerant oil is set as Sf, and is represented by Sf=S-Sa-Sa'.

[0131] Here, the weight of the refrigerant dissolved in the refrigerant oil in refrigerant circuit 10 is denoted as Wro(g), expressed as Wro(g) = Wo·S. It should be noted that the weight of HFO-1132(E) dissolved in the refrigerant oil in refrigerant circuit 10 is expressed as Wo·Sa. The weight of R32 dissolved in the refrigerant oil in refrigerant circuit 10 is expressed as Wo·Sa'. The weight of HFO-1234yf dissolved in the refrigerant oil in refrigerant circuit 10 is expressed as Wo·Sf.

[0132] The weight of refrigerant circulating in refrigerant circuit 10 that is not dissolved in the refrigerant oil is expressed as Wr-Wro (g). It should be noted that the weight of HFO-1132(E) circulating in refrigerant circuit 10 that is not dissolved in the refrigerant oil is expressed as Wr·A-Wo·Sa, the weight of R32 circulating in refrigerant circuit 10 that is not dissolved in the refrigerant oil is expressed as Wr·A'-Wo·Sa', and the weight of HFO-1234yf circulating in refrigerant circuit 10 that is not dissolved in the refrigerant oil is expressed as Wr·F-Wo·Sf.

[0133] In this case, if the weight percentage (%) of HFO-1132(E) in the refrigerant circulating in the refrigerant circuit 10 that is not dissolved in the refrigeration oil is set as X, it is expressed as follows.

[0134] X=(Wr·A-Wo·Sa) / (Wr-Wro)

[0135] =(Wr·A-Wo·Sa) / (Wr·A-Wo·Sa+Wr·A'-Wo·Sa'+Wr·F-Wo·Sf)

[0136] =(Wr·A-Wo·Sa) / (Wr·A-Wo·Sa+Wr·A'-Wo·Sa'+Wr·(100-A-A')-Wo·(S-Sa-Sa'))

[0137] =(Wr·A-Wo·Sa) / (Wr·A-Wo·Sa+Wr·(A·21.5 / 28)-Wo·Sa·(21.5 / 28)+Wr·(100-A-(A·21.5 / 28))-Wo·(S-Sa-Sa·(21.5 / 28)))

[0138] =(Wr·A-Wo·Sa) / (Wr·100-Wo·S)

[0139] =(Wr·A) / (Wr·100-Wo·S)-(Wo·Sa) / (Wr·100-Wo·S)

[0140] Furthermore, regarding X, it can be represented as follows by using the coefficients "aQS" and "bQS".

[0141] X=aQS·Sa+bQS

[0142] Here, aQS=-(Wo) / (Wr·100-Wo·S), bQS=(Wr·A) / (Wr·100-Wo·S).

[0143] Here, regarding "aQS", the line is obtained by plotting the value of aQS as the value of Q changes according to the value of S (see reference). Figure 3 )like Figure 4 The approximation, as shown by the curve, can be represented as follows. It should be noted that... Figure 3 , Figure 4 The example illustrates the case where A is 32.5%, S varies within the range of 10 to 100%, and Q varies within the range of 10 to 90%.

[0144] aQS={(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1

[0145] In addition, regarding "bQS", it can be elaborated as follows.

[0146] bQS=(Wr·A) / (Wr·100-Wo·S)

[0147] =(Wr·A / Wr)) / (Wr·100 / Wr-Wo·S / Wr)

[0148] =A / (100-Wo·S / Wr)

[0149] =A / (100-Q·S)

[0150] As mentioned above, X can ultimately be represented as follows.

[0151] X=aQS·Sa+bQS

[0152] =[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]·Sa+{A / (100-Q·S)}

[0153] Here, regarding the solubility of refrigeration oil, HFO-1132(E) is similar to R32, tending to dissolve relative to refrigeration oil at a certain ratio. However, HFO-1132(E) and R32 exhibit a different tendency compared to HFO-1234yf. In this case, if more HFO-1132(E) and R32 dissolve in the refrigeration oil, resulting in a decrease in the total concentration of HFO-1132(E) and R32 in the refrigerant circulating in refrigerant circuit 10, there is a tendency for a decrease in cooling capacity. Therefore, assuming the cooling capacity of the refrigerant circulated in refrigerant circuit 10 is 100, the ratio of cooling capacity (cooling capacity ratio) of the refrigerant circulating in refrigerant circuit 10 but not dissolved in refrigeration oil can be expressed as a function of the weight of HFO-1132(E) used as the filling refrigerant, i.e., A. Furthermore, to ensure a cooling capacity ratio of over 90%, X must satisfy the following conditions in its relationship with A. It should be noted that if the compressor 2 used in the refrigeration cycle unit 1 can be capacity-controlled, the reduction in compressor efficiency can be minimized, and the reduction in cooling capacity can be compensated for.

[0154] X ≥ -8.45932 × 10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527

[0155] Furthermore, if HFO-1234yf dissolves more into the refrigerant oil, increasing the concentrations of HFO-1132(E) and R32 in the refrigerant circulating in the refrigerant circuit 10, there is a tendency for the coefficient of performance (COP) to decrease. Therefore, assuming the COP of the refrigerant circulating in the refrigerant circuit 10 is 100, the ratio of the COPs of the refrigerant circulating in the refrigerant circuit 10 without dissolving in the refrigerant oil (COP ratio) can be expressed as a function of the weight of HFO-1132(E) used in the refrigerant. Furthermore, to ensure a COP ratio of 99% or higher, X must satisfy the following condition in its relationship with A. It should be noted that while the COP is primarily determined by the composition of the refrigerant circulating in the refrigerant circuit 10, the decrease in COP can be compensated by providing a heat medium supply mechanism, such as a fan, capable of controlling the supply of heat mediums like air to the first heat exchanger 3 and the second heat exchanger 5.

[0156] Case where 22.5≤A≤30.3: X≤1.12468×10 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377

[0157] Case where 30.3<A≤42.5: X≤56.6

[0158] From the above, it is necessary for X to satisfy the following relationship in order to ensure that the refrigeration capacity ratio is 90% or more and the coefficient of performance ratio is 99% or more.

[0159] Case where 22.5≤A≤30.3: -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤X≤1.12468×10 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377

[0160] Case where 30.3<A≤42.5: -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤X≤56.6

[0161] It should be noted that the following conditions need to be satisfied in order to ensure that the refrigeration capacity ratio is 95% or more. It should be noted that if the compressor 2 used in the refrigeration cycle device 1 is capable of capacity control, the reduction in refrigeration capacity can be compensated while the compressor efficiency is favorably maintained.

[0162] X≥-4.64589×10 -4 ×A 2 +9.34385×10 -1 ×A-1.18947

[0163] It should be noted that the following conditions need to be satisfied in order to ensure that the refrigeration capacity ratio is 100% or more.

[0164] X≥A

[0165] Figure 5 is a graph showing the relationship of X to A.

[0166] In Figure 5 the graph, it is shown that the further downward, the more HFO-1132(E) and R32 dissolve in the refrigerating machine oil, and the lower the cooling capacity ratio of the working fluid becomes. Further, in Figure 5 the graph, it is shown that the further upward, the more HFO-1234yf dissolves in the refrigerating machine oil, and the lower the coefficient of performance ratio of the working fluid becomes.

[0167] It should be noted that Figure 5 the line (1) shown is a line with a cooling capacity ratio of 90%, and the area below it indicates that the cooling capacity ratio is less than 90%. Figure 5 the line (2) shown is a line with a cooling capacity ratio of 95%, and the area below it indicates that the cooling capacity ratio is less than 95%. Figure 5 the line (3) shown is a line with a cooling capacity ratio of 100%, and the area below it indicates that the cooling capacity ratio is less than 100%. Figure 5 the line (4) shown is a line with a coefficient of performance ratio of 99%, and the area above it indicates that the coefficient of performance ratio is less than 99%. In Figure 5 , the shaded range represents a range where, on the basis of ensuring the cooling capacity ratio of 90% or more and the coefficient of performance ratio of 99% or more, the value of A is a range of 22.5 wt% or more which is preferable from the viewpoint of ensuring cooling capacity and 42.5 wt% or less which is preferable from the viewpoint of suppressing flammability, and is a range of 56.6 wt% or less which is the preferable weight ratio of HFO-1132(E) in the refrigerant that is not dissolved in the refrigerating machine oil and circulates in the refrigerant circuit 10 (the upper limit of X in the case of 30.3<A≤42.5).

[0168] Figure 6 is a graph showing the value of X with respect to Sa for each Q.

[0169] It should be noted that, in Figure 6 , taking the case where A is 28% and S is 60% as an example, the case where Q is varied within the range of 10 to 90% is illustrated. Figure 6 the dashed line (1) shown represents the lower limit line of X required to ensure a cooling capacity ratio of 90% or more. Figure 6 the dashed line (2) shown represents the lower limit line of X required to ensure a cooling capacity ratio of 95% or more. Figure 6 the dashed line (3) shown represents the lower limit line of X required to ensure a cooling capacity ratio of 100% or more. Figure 6 the dashed line (4) shown represents the upper limit line of X required to ensure a coefficient of performance ratio of 99% or more.

[0170] exist Figure 6 From the viewpoint of maintaining good lubrication performance in compressor 2, Sa is preferably 5.7% by weight or more. Figure 6 In the diagram, the shaded range represents the preferred range for maintaining good lubrication performance in compressor 2 while ensuring a cooling capacity ratio of 90% or higher and a coefficient of performance (COP) ratio of 99% or higher. The upper limit of Sa in this shaded range, 33.9% by weight, is based on... Figure 6 The example shown is obtained when S is 60% and there is a tendency for HFO-1132(E) and R32 to dissolve in a ratio of 28:21.5.

[0171] It should be noted that, based on the above... Figure 4 , Figure 5 , Figure 6 It can understand the behavior of other parameters when each parameter changes.

[0172] It should be noted that the refrigeration capacity (sometimes also expressed as cooling capacity or capacity) and coefficient of performance (COP) of the mixed refrigerants HFO-1132(E), R32 and HFO-1234yf were obtained by performing theoretical calculations of the refrigeration cycle of the mixed refrigerants using the Reference Fluid Thermodynamic and Transport Properties Database (REFPROP 10.0) created by the National Institute of Science and Technology (NIST) under the following conditions.

[0173] Evaporation temperature: 5℃

[0174] Condensation temperature: 45℃

[0175] Overheating: 5K

[0176] Supercooling: 5K

[0177] Compressor efficiency: 70%

[0178] It should be noted that the formulas for calculating cooling capacity and COP are as follows.

[0179] Cooling capacity = Refrigerant circulation volume × Enthalpy difference of cooling effect

[0180] COP = Enthalpy difference of cooling effect / Enthalpy difference of compression work

[0181] (Experimental Example 2)

[0182] In the above-mentioned Experimental Example 1, the calculation of each parameter was illustrated by focusing on the tendency to use HFO-1132(E) and R32 under certain relationships.

[0183] In contrast, in Test Example 2 described below, HFO-1132(E) and R32 tend to exhibit similar behavior. Therefore, the parameters were calculated for refrigerants that treat HFO-1132(E) and R32 as a whole.

[0184] In Experimental Example 2, by determining the weight percentage (%) of the total refrigerant HFO-1132(E) and R32 in the refrigerant circulating in the refrigerant circuit 10 that is not dissolved in the refrigerant oil, the conditions that ensure a refrigerant capacity ratio of 90% or higher and a coefficient of performance ratio of 99% or higher were determined. Furthermore, conditions that ensure a refrigerant capacity ratio of 95% or higher and a coefficient of performance ratio of 99% or higher, as well as conditions that ensure a refrigerant capacity ratio of 100% or higher and a coefficient of performance ratio of 99% or higher, were determined.

[0185] It should be noted that the weight percentage (%) of HFO-1234yf in the circulating refrigerant that is not dissolved in the refrigeration oil is the value obtained by subtracting the combined weight percentage (%) of HFO-1132(E) and R32 from 100(%).

[0186] Specifically, S and Q are used similarly as described above, with B replacing A and Sb replacing Sa, and the following parameters are used. It should be noted that, in the following, S (%) is the ratio of the weight of the refrigerant dissolved in the refrigerant oil in refrigerant circuit 10 to the weight of the refrigerant oil; Q (%) is the ratio of the weight of the refrigerant oil in refrigerant circuit 10 to the weight of the refrigerant; B (%) is the ratio of the total weight of HFO-1132(E) and R32 in refrigerant circuit 10 to the weight of the refrigerant; and Sb (%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigerant oil in refrigerant circuit 10 to the weight of the refrigerant oil.

[0187] Regarding the composition of the refrigerant filling the refrigerant circuit 10, it is set as HFO-1132(E)+R32 / HFO-1234yf=B / F(wt%). Here, B is the same as above.

[0188] The weight of the refrigerant filled in the refrigerant circuit 10, i.e., the refrigerant filling amount, is denoted as Wr (g). Therefore, the total weight of HFO-1132(E) and R32 filled in the refrigerant circuit 10 is expressed as Wr·B (g). Furthermore, the weight of HFO-1234yf filled in the refrigerant circuit 10 is expressed as Wr·F (g).

[0189] Let the weight ratio of HFO-1234yf dissolved in the refrigerant circuit 10 to the weight of the refrigerant oil be Sf, which is expressed by Sf=S-Sb.

[0190] Here, the weight of the refrigerant dissolved in the refrigeration oil in refrigerant circuit 10 is denoted as Wro(g), expressed as Wro(g) = Wo·S. It should be noted that the combined weight of HFO-1132(E) and R32 dissolved in the refrigeration oil in refrigerant circuit 10 is expressed as Wo·Sb. The weight of HFO-1234yf dissolved in the refrigeration oil in refrigerant circuit 10 is expressed as Wo·Sf.

[0191] The weight of the refrigerant circulating in refrigerant circuit 10 that is not dissolved in the refrigerant oil is expressed as Wr-Wro (g). It should be noted that the total weight of HFO-1132(E) and R32 circulating in refrigerant circuit 10 that is not dissolved in the refrigerant oil is expressed as Wr·B-Wo·Sb, and the weight of HFO-1234yf circulating in refrigerant circuit 10 that is not dissolved in the refrigerant oil is expressed as Wr·F-Wo·Sf.

[0192] In this case, if the total weight ratio (%) of HFO-1132(E) and R32 in the refrigerant circulating in the refrigerant circuit 10 that is not dissolved in the refrigeration oil is set as Y, it is expressed as follows.

[0193] Y=(Wr·B-Wo·Sb) / (Wr-Wro)

[0194] =(Wr·B-Wo·Sb) / (Wr·B-Wo·Sb+Wr·F-Wo·Sf)

[0195] =(Wr·B-Wo·Sb) / (Wr·B-Wo·Sb+Wr·(100-B)-Wo·(S-Sb))

[0196] =(Wr·B-Wo·Sb) / (Wr·100-Wo·S)

[0197] =(Wr·B-Wo·Sb) / (Wr·100-Wo·S)

[0198] =(Wr·B) / (Wr·100-Wo·S)-(Wo·Sb) / (Wr·100-Wo·S)

[0199] Furthermore, Y can be represented as follows by using the coefficients "cQS" and "dQS".

[0200] Y=cQS·Sb+dQS

[0201] Here, cQS=-(Wo) / (Wr·100-Wo·S), cQS=(Wr·A) / (Wr·100-Wo·S).

[0202] Here, with Figure 3 and Figure 4 Similarly, by obtaining an approximation for “cQS”, it can be represented as follows.

[0203] cQS={(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1

[0204] In addition, regarding "bQS", it can be expanded as follows.

[0205] bQS=(Wr·B) / (Wr·100-Wo·S)

[0206] =(Wr·B / Wr)) / (Wr·100 / Wr-Wo·S / Wr)

[0207] =B / (100-Wo·S / Wr)

[0208] =B / (100-Q·S)

[0209] As mentioned above, Y can ultimately be represented as follows.

[0210] Y=cQS·Sb+dQS

[0211] =[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]·Sa+{B / (100-Q·S)}

[0212] Here, regarding the solubility of refrigeration oil, HFO-1132(E) is similar to R32, tending to dissolve relative to refrigeration oil at a certain ratio. However, HFO-1132(E) and R32 exhibit a different tendency compared to HFO-1234yf. In this case, if more HFO-1132(E) and R32 dissolve in the refrigeration oil, resulting in a decrease in the total concentration of HFO-1132(E) and R32 in the refrigerant circulating in refrigerant circuit 10, there is a tendency for a decrease in cooling capacity. Therefore, assuming the cooling capacity of the refrigerant circulated in refrigerant circuit 10 is 100, the ratio of the cooling capacity of the refrigerant circulating in refrigerant circuit 10 that is not dissolved in refrigeration oil (cooling capacity ratio) can be expressed as a function of the ratio of the total weight of HFO-1132(E) and R32 used as the filling refrigerant, i.e., B. Furthermore, to ensure a cooling capacity ratio of over 90%, Y needs to meet the following conditions in its relationship with B. It should be noted that if the compressor 2 used in the refrigeration cycle unit 1 can be capacity-controlled, the reduction in compressor efficiency can be minimized, and the reduction in cooling capacity can be compensated for.

[0213] Y≥-4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914

[0214] Furthermore, if HFO-1234yf dissolves more into the refrigerant oil, increasing the concentrations of HFO-1132(E) and R32 in the refrigerant circulating in refrigerant circuit 10, there is a tendency for the coefficient of performance (COP) to decrease. Therefore, assuming the COP of the refrigerant circulating in refrigerant circuit 10 is 100, the ratio of the COP of the refrigerant circulating in refrigerant circuit 10 that is not dissolved in the refrigerant oil (COP ratio) can be expressed as a function of B, the ratio of the total weight of HFO-1132(E) and R32 in the refrigerant. Furthermore, to ensure a COP ratio of 99% or higher, Y must satisfy the following condition in its relationship with B. It should be noted that the coefficient of performance is mainly determined by the composition of the refrigerant circulating in the refrigerant circuit 10. However, if a heat medium supply machine, such as a fan, is provided that can control the supply of heat medium such as air to the first heat exchanger 3 and the second heat exchanger 5, the reduction in the coefficient of performance can be compensated.

[0215] In the case where 40.0 ≤ B ≤ 53.6: Y ≤ 2.03558 × 10 -5 ×B 4 -1.04176×10-3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B+36.0237

[0216] For the case of 53.6<B≤75.0: Y≤100

[0217] From the above, it is known that Y needs to satisfy the following relationship in order to ensure that the cooling capacity ratio is 90% or more and the coefficient of performance ratio is 99% or more.

[0218] For the case of 40.0≤B≤53.6: -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Y≤2.03558×10 -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B+36.0237

[0219] For the case of 53.6<B≤75.0: -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Y≤100

[0220] It should be noted that the following conditions need to be satisfied in order to ensure that the cooling capacity ratio is 95% or more. It should be noted that if the compressor 2 used in the refrigeration cycle apparatus 1 is capable of capacity control, the reduction in cooling capacity can be compensated while the compressor efficiency is favorably maintained.

[0221] Y≥-2.62798×10 -4 ×B 2 +9.34385×10 -1 ×B-2.10281

[0222] It should be noted that the following conditions need to be satisfied in order to ensure that the cooling capacity ratio is 100% or more.

[0223] Y≥B

[0224] Figure 7 is a graph showing the relationship of Y to B.

[0225] In Figure 7 The graph shows that the further down the flow path, the more HFO-1132(E) and R32 dissolve into the refrigeration oil, resulting in a lower cooling capacity compared to the working fluid. Additionally, in... Figure 7 The graph shows that the higher the HFO-1234yf moves, the more it dissolves into the refrigeration oil, resulting in a lower coefficient of performance (COP) for the working fluid.

[0226] It should be noted that, Figure 7 The line shown in (5) is the line with a cooling capacity ratio of 90%, and below it, it indicates a cooling capacity ratio of less than 90%. Figure 7 The line shown in (6) is the line with a cooling capacity ratio of 95%, and below it, it indicates a cooling capacity ratio of less than 95%. Figure 7 The line shown in (7) is the line with a cooling capacity ratio of 100%, and below it, it indicates a cooling capacity ratio of less than 100%. Figure 7 The line shown in (8) represents a performance coefficient ratio of 99%, and lines above it indicate performance coefficient ratios less than 99%. Figure 7 In the diagram, the shaded range indicates that, based on ensuring a cooling capacity ratio of 90% or more and a coefficient of performance ratio of 99% or more, the value of B is preferably 40 wt% or more from the viewpoint of ensuring cooling capacity and preferably 75 wt% or less from the viewpoint of suppressing flammability.

[0227] Figure 8 It is a graph showing the value of Y against Sb for each Q.

[0228] It should be noted that, in Figure 8 In the example, with B at 49.5% and S at 60%, the case of Q varying within the range of 10% to 90% is illustrated. Figure 8 The dashed line (5) shown represents the lower limit of X required to ensure a cooling capacity ratio of over 90%. Figure 8 The dashed line (6) shown represents the lower limit of X required to ensure a cooling capacity ratio of 95% or higher. Figure 8 The dashed line (7) shown represents the lower limit of X required to ensure a cooling capacity ratio of 100% or higher. Figure 8 The dashed line (8) shown represents the upper limit of X required to ensure a performance coefficient ratio of 99% or higher.

[0229] exist Figure 8 From the viewpoint of maintaining good lubrication performance in compressor 2, S is preferably 10% by weight or more, and Sb is preferably 10% by weight or more. Figure 8In the diagram, the shaded range represents the preferred range for maintaining good lubrication performance in compressor 2 while ensuring a cooling capacity ratio of 90% or higher and a coefficient of performance of 99% or higher. The upper limit of Sb in this shaded area, 60% by weight, is based on... Figure 8 The example shown is obtained when S is 60%.

[0230] It should be noted that, based on the above... Figure 7 , Figure 8 It can understand the behavior of other parameters when each parameter changes.

[0231] It should be noted that the coefficient of performance and cooling capacity of the mixed refrigerants HFO-1132(E), R32 and HFO-1234yf are the same as those in Test Example 1.

[0232] (5-2) Regarding the refrigerant oil in the compressor's oil reservoir

[0233] In the above (5-1), the parameters were studied with regard to the overall refrigerant oil filling the refrigerant circuit 10. However, from the point of view that most of the refrigerant oil in the refrigerant circuit 10 exists in the oil reservoir 37 of the compressor 2, and the amount of refrigerant oil flowing from the compressor 2 to other parts of the refrigerant circuit 10 is substantially negligible, the relationship between the refrigerant and the refrigerant oil can also be determined as follows.

[0234] (5-2-1) Regarding the case based on the weight ratio of HFO-1132(E)

[0235] Regarding the working fluid containing refrigerant and refrigeration oil, the value is 22.5 ≤ A ≤ 42.5. Furthermore, regarding the working fluid, under operating conditions where the refrigerant discharged from compressor 2 has a discharge temperature of 66°C and a discharge pressure of 2.1 MPa, the value of Xa, expressed as Xa = [{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Ta+{A / (100-RT)}, satisfies -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤Xa. Here, when 22.5≤A≤30.3, Xa≤1.12468×10 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2×A+20.377. Further, in the case of 30.3<A≤42.5, Xa≤56.6 is satisfied.

[0236] Here, T(%) is the ratio of the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil in the oil reservoir 37, which is the third total weight, to the weight of the refrigerating machine oil in the oil reservoir 37. The third total weight refers to the total weight of the portion of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit 10 that is dissolved in the refrigerating machine oil in the oil reservoir 37, rather than the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit 10.

[0237] R(%) is the ratio of the weight of the refrigerating machine oil in the oil reservoir 37 to the total weight of HFO-1132(E), R32 and HFO-1234yf, which is the second total weight. Further, the second total weight refers to the total weight of HFO-1132(E), R32 and HFO-1234yf charged into the refrigerant circuit 10, and is a value independent of whether or not they are dissolved in the refrigerating machine oil.

[0238] Similar to the case described in (5-1-1), A(%) is the ratio of the weight of HFO-1132(E) to the second total weight.

[0239] Ta(%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil in the oil reservoir 37 to the weight of the refrigerating machine oil in the oil reservoir 37.

[0240] According to this refrigeration cycle device 1, it is possible to ensure that the ratio of refrigeration capacity (refrigeration capacity ratio) is 90% or more, and the ratio of refrigeration capacity refers to the ratio of the refrigeration capacity possessed by the refrigerant that circulates in the refrigerant circuit 10 without being dissolved in the refrigerating machine oil to the refrigeration capacity possessed by the refrigerant of the refrigerant composition assumed to be charged into the refrigerant circuit 10 when it circulates in the refrigerant circuit 10. In addition, it is possible to ensure that the ratio of coefficient of performance (coefficient of performance ratio) is 99% or more, and the ratio of coefficient of performance refers to the ratio of the coefficient of performance possessed by the refrigerant that circulates in the refrigerant circuit 10 without being dissolved in the refrigerating machine oil to the coefficient of performance possessed by the refrigerant of the refrigerant composition assumed to be charged into the refrigerant circuit 10 when it circulates in the refrigerant circuit.

[0241] It should be noted that the weight of R32 relative to the second total weight is in a relatively narrow range of 21.0×A / 28 or more and 22.0×A / 28 or less, and therefore within this range, even if the ratio of R32 to HFO-1132(E) changes slightly, the refrigeration capacity and the coefficient of performance are in a substantially equivalent relationship.

[0242] In addition, since A is above 22.5, it is easy to ensure cooling capacity, and since A is below 42.5, it is possible to suppress refrigerant combustion even in the event of a leak.

[0243] It should be noted that, from the viewpoint of ensuring a cooling capacity ratio of over 95%, under the above operating conditions of a refrigerant discharge temperature of 66°C and a discharge pressure of 2.1 MPa, it is preferable to further satisfy -4.64589×10 -4 ×A 2 +9.34385×10 -1 ×A-1.18947≤X.

[0244] Furthermore, from the viewpoint of ensuring a cooling capacity ratio of over 100%, under the aforementioned operating conditions of a refrigerant discharge temperature of 66°C and a discharge pressure of 2.1 MPa, it is preferable to further satisfy A≤X.

[0245] The refrigerant and refrigeration oil used in the refrigeration cycle unit 1 are particularly preferred to have the following weight ratios: HFO-1132(E) in the refrigerant is 27% or more and 29% or less; R32 in the refrigerant is 20.5% or more and 22.5% or less; and HFO-1234yf in the refrigerant is 49.5% or more and 51.5% or less, and the condition 20 ≤ R ≤ 60 is met.

[0246] Here, from the viewpoint of maintaining good lubrication performance in compressor 2 when refrigerant is compressed, it is preferable that T(%) is 10 or more under the above operating conditions of refrigerant discharge temperature of 66°C and discharge pressure of 2.1 MPa.

[0247] (5-2-2) Regarding the case based on the total weight ratio of HFO-1132(E) and R32

[0248] Regarding the working fluid containing refrigerant and refrigeration oil, 40 ≤ B ≤ 75. Furthermore, regarding the working fluid, under operating conditions where the refrigerant discharged from compressor 2 has a discharge temperature of 66°C and a discharge pressure of 2.1 MPa, the value of Ya, expressed as Ya = [{(-1.3257T + 1.0919) / (R + 233.27T - 207.91)} + 1]Tb + {B / (100 - RT)}, satisfies -4.78507 × 10⁻¹⁰. -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Ya. Here, when 40.0≤B≤53.6, Ya≤2.03558×10 is satisfied. -5 ×B 4 -1.04176×10-3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B+36.0237. Further, in the case of 53.6<B≤75.0, Ya≤100 is satisfied.

[0249] Here, similarly to (5-2-1), T(%) is the ratio of the third total weight to the weight of the refrigerating machine oil in the oil reservoir 37.

[0250] Similarly to (5-2-1), R(%) is the ratio of the weight of the refrigerating machine oil in the oil reservoir 37 to the second total weight.

[0251] B(%) is the ratio of the total weight of HFO-1132(E) and R32 to the second total weight.

[0252] Tb(%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil in the oil reservoir 37 to the weight of the refrigerating machine oil in the oil reservoir 37.

[0253] According to this refrigeration cycle apparatus 1, it is possible to ensure that the ratio of the refrigeration capacity (refrigeration capacity ratio) is 90% or more, and the ratio of the refrigeration capacity refers to the ratio of the refrigeration capacity possessed by the refrigerant that circulates in the refrigerant circuit 10 without being dissolved in the refrigerating machine oil to the refrigeration capacity possessed by the refrigerant of the refrigerant composition assumed to be charged into the refrigerant circuit 10 when it circulates in the refrigerant circuit 10. In addition, it is possible to ensure that the ratio of the coefficient of performance (coefficient of performance ratio) is 99% or more, and the ratio of the coefficient of performance refers to the ratio of the coefficient of performance possessed by the refrigerant that circulates in the refrigerant circuit 10 without being dissolved in the refrigerating machine oil to the coefficient of performance possessed by the refrigerant of the refrigerant composition assumed to be charged into the refrigerant circuit 10 when it circulates in the refrigerant circuit.

[0254] Further, since B is 40 or more, it is easy to ensure the refrigeration capacity, and since B is 75 or less, combustion of the refrigerant can be suppressed even in the event of a leak.

[0255] Further, from the viewpoint of ensuring that the refrigeration capacity ratio is 95% or more, under the above operating conditions where the discharge temperature of the refrigerant is 66°C and the discharge pressure is 2.1 MPa, it is preferable to further satisfy -2.62798×10 -4 ×B 2 +9.34385×10 -1 ×B-2.10281≤Y.

[0256] Furthermore, from the viewpoint of ensuring a cooling capacity ratio of over 100%, under the aforementioned operating conditions of a refrigerant discharge temperature of 66°C and a discharge pressure of 2.1 MPa, it is preferable to further satisfy B≤Y.

[0257] The refrigerant and refrigeration oil used in the refrigeration cycle unit 1 are particularly preferred to have the following weight ratios: HFO-1132(E) in the refrigerant is 27% or more and 29% or less; R32 in the refrigerant is 20.5% or more and 22.5% or less; and HFO-1234yf in the refrigerant is 49.5% or more and 51.5% or less, and the condition 20 ≤ R ≤ 60 is met.

[0258] Here, from the viewpoint of maintaining good lubrication performance in compressor 2 when refrigerant is compressed, it is preferable that T(%) is 10 or more under the above operating conditions of refrigerant discharge temperature of 66°C and discharge pressure of 2.1 MPa.

[0259] (Postscript)

[0260] The embodiments of this disclosure have been described above, but it should be understood that various changes in manner and details can be made without departing from the spirit and scope of this disclosure as set forth in the claims.

[0261] Symbol Explanation

[0262] 1. Refrigeration cycle device

[0263] 2. Compressor

[0264] 10 Refrigerant Circuit

[0265] 21 Compression element

[0266] 37. Oil Storage Department

[0267] Existing technical documents

[0268] Patent documents

[0269] Patent Document 1: Japanese Patent Application Publication No. 2015-200480

Claims

1. A refrigeration cycle device (1) that uses a working fluid containing a refrigerant and a refrigerating machine oil, wherein the refrigerant comprises trans-1,2-difluoroethylene HFO-1132(E), difluoromethane R32, and 2,3,3,3-tetrafluoropropene HFO-1234yf, wherein the refrigeration cycle device has a compressor (2) and is provided with a refrigerant circuit (10) for the working fluid to circulate therethrough, with regard to the working fluid, when the ratio of the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil, i.e., the first total weight, relative to the weight of the refrigerating machine oil is defined as S, with the unit being %, the ratio of the weight of the refrigerating machine oil relative to the total weight of HFO-1132(E), R32 and HFO-1234yf, i.e., the second total weight, is defined as Q, with the unit being %, the ratio of the weight of HFO-1132(E) relative to the second total weight is defined as A, with the unit being %, and the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil relative to the weight of the refrigerating machine oil is defined as Sa, with the unit being %, 22.5≤A≤42.5， the weight of R32 relative to the second total weight is 21.0×A / 28 or more and 22.0×A / 28 or less, under the operating condition that the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, The value of X, expressed as X = [{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sa+{A / (100-QS)}, satisfies -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤X, Given 22.5 ≤ A ≤ 30.3, X ≤ 1.12468 × 10 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377, when 30.3 < A ≤ 42.5, X ≤ 56.6 is satisfied.

2. The refrigeration cycle device according to claim 1, wherein, The Sa under the operating condition is 5.7 or more, and the unit of Sa is %.

3. The refrigeration cycle device according to claim 1 or 2, wherein, Under the aforementioned operating conditions, the following condition is also satisfied: -4.64589 × 10 -4 ×A 2 +9.34385×10 -1 ×A-1.18947≤X.

4. The refrigeration cycle device according to claim 1 or 2, wherein, Under the operating condition, A ≤ X is further satisfied.

5. A refrigeration cycle device (1) that uses a working fluid containing a refrigerant and a refrigerating machine oil, wherein the refrigerant comprises trans-1,2-difluoroethylene HFO-1132(E), difluoromethane R32, and 2,3,3,3-tetrafluoropropene HFO-1234yf, wherein the refrigeration cycle device has a compressor (2) and is provided with a refrigerant circuit (10) for the working fluid to circulate therethrough, with regard to the working fluid, when the ratio of the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil, i.e., the first total weight, relative to the weight of the refrigerating machine oil is defined as S, with the unit being %, the ratio of the weight of the refrigerating machine oil relative to the total weight of HFO-1132(E), R32 and HFO-1234yf, i.e., the second total weight, is defined as Q, with the unit being %, the ratio of the total weight of HFO-1132(E) and R32 relative to the second total weight is defined as B, with the unit being %, and the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil relative to the weight of the refrigerating machine oil is defined as Sb, with the unit being %, 40.0≤B≤75.0， under the operating condition that the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, The value of Y, expressed by Y=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sb+{B / (100-QS)}, satisfies -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Y, Given 40.0 ≤ B ≤ 53.6, Y ≤ 2.03558 × 10 -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B+36.0237, In a case where 53.6<B≤75.0, Y≤100 is satisfied.

6. The refrigeration cycle device according to claim 5, wherein, Under the aforementioned operating conditions, it also satisfies -2.62798×10 -4 ×B 2 +9.34385×10 -1 ×B-2.10281≤Y.

7. The refrigeration cycle device according to claim 5, wherein, Under the said operating condition, B≤Y is further satisfied.

8. The refrigeration cycle apparatus according to any one of claims 1 to 7, wherein, The S under the said operating condition is 10 or more, and the unit of S is %.

9. The refrigeration cycle apparatus according to any one of claims 1 to 8, wherein, The proportion by weight of HFO-1132(E) in the refrigerant is 27% to 29%, the proportion by weight of R32 in the refrigerant is 20.5% to 22.5%, and the proportion by weight of HFO-1234yf in the refrigerant is 49.5% to 51.5%, 20≤Q≤60 is satisfied.

10. A refrigeration cycle device, which is a refrigeration cycle device (1) using a working fluid containing a refrigerant and a refrigerating machine oil, the refrigerant comprising trans-1,2-difluoroethylene HFO-1132(E), difluoromethane R32 and 2,3,3,3-tetrafluoropropene HFO-1234yf, wherein the refrigeration cycle device has a compressor (2) and is provided with a refrigerant circuit (10) for circulating the working fluid, and the compressor (2) comprises a compression element (21) that compresses the refrigerant and an oil reservoir (37) that stores the refrigerating machine oil, with regard to the working fluid, where T is defined as the ratio of the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil in the oil reservoir, that is, the third total weight, relative to the weight of the refrigerating machine oil in the oil reservoir, with the unit being %, R is defined as the ratio of the weight of the refrigerating machine oil in the oil reservoir relative to the total weight of HFO-1132(E), R32 and HFO-1234yf, that is, the second total weight, with the unit being %, A is defined as the ratio of the weight of HFO-1132(E) relative to the second total weight, with the unit being %, and Ta is defined as the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil in the oil reservoir relative to the weight of the refrigerating machine oil in the oil reservoir, with the unit being %, 22.5≤A≤42.5， the weight of R32 relative to the second total weight is 21.0×A / 28 or more and 22.0×A / 28 or less, under the operating condition that the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, The value of Xa, expressed as Xa = [{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Ta+{A / (100-RT)}, satisfies -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤Xa, Given 22.5 ≤ A ≤ 30.3, Xa ≤ 1.12468 × 10 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377, in a case where 30.3<A≤42.5, Xa≤56.6 is satisfied.

11. A refrigeration cycle device, which is a refrigeration cycle device (1) using a working fluid containing a refrigerant and a refrigerating machine oil, the refrigerant comprising trans-1,2-difluoroethylene HFO-1132(E), difluoromethane R32 and 2,3,3,3-tetrafluoropropene HFO-1234yf, wherein the refrigeration cycle device has a compressor (2) and is provided with a refrigerant circuit (10) for circulating the working fluid, and the compressor (2) comprises a compression element (21) that compresses the refrigerant and an oil reservoir (37) that stores the refrigerating machine oil, with regard to the working fluid, Let T be the ratio (in %) of the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil in the oil reservoir, that is the third total weight, to the weight of the refrigerating machine oil in the oil reservoir, let R be the ratio (in %) of the weight of the refrigerating machine oil in the oil reservoir to the total weight of HFO-1132(E), R32 and HFO-1234yf, that is the second total weight, let B be the ratio (in %) of the total weight of HFO-1132(E) and R32 to the second total weight, and let Tb be the ratio (in %) of the total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil in the oil reservoir to the weight of the refrigerating machine oil in the oil reservoir, 40.0≤B≤75.0 is satisfied, under the operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1MPa, The value of Ya, expressed as Ya = [{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Tb+{B / (100-RT)}, satisfies -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Ya, Given 40.0 ≤ B ≤ 53.6, Ya ≤ 2.03558 × 10 -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B+36.0237, in the case of 53.6<B≤75.0, Ya≤100 is satisfied.

12. The refrigeration cycle apparatus according to claim 10 or 11, wherein, The T under the operating conditions is 10 or more, and the unit of T is %.

13. The refrigeration cycle apparatus according to any one of claims 10 to 12, wherein, The weight ratio of HFO-1132(E) in the refrigerant is 27% or more and 29% or less, the weight ratio of R32 in the refrigerant is 20.5% or more and 22.5% or less, and the weight ratio of HFO-1234yf in the refrigerant is 49.5% or more and 51.5% or less, 20≤R≤60 is satisfied.

14. The refrigeration cycle apparatus according to any one of claims 1 to 13, wherein, The second total weight in the refrigerant is 95% or more.

15. The refrigeration cycle apparatus according to any one of claims 1 to 14, wherein, The refrigerating machine oil contains at least one selected from the group consisting of polyol ester POE, polyvinyl ether PVE and polyalkylene glycol PAG.

16. A refrigerating machine oil for a refrigeration cycle device, which is the refrigerating machine oil for a refrigeration cycle device (1) used as a working fluid together with a refrigerant containing trans-1,2-difluoroethylene HFO-1132(E), difluoromethane R32 and 2,3,3,3-tetrafluoropropene HFO-1234yf, wherein the refrigeration cycle device has a compressor (2) and is provided with a refrigerant circuit (10) for circulating the working fluid, with regard to the working fluid, let S be the ratio (in %) of the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil, that is the first total weight, to the weight of the refrigerating machine oil, let Q be the ratio (in %) of the weight of the refrigerating machine oil to the total weight of HFO-1132(E), R32 and HFO-1234yf, that is the second total weight, let A be the ratio (in %) of the weight of HFO-1132(E) to the second total weight, and let Sa be the ratio (in %) of the weight of HFO-1132(E) dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil, 22.5≤A≤42.5， the weight of R32 relative to the second total weight is 21.0×A / 28 or more and 22.0×A / 28 or less, Under the operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, The value of X, expressed as X = [{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sa+{A / (100-QS)}, satisfies -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤X, Given 22.5 ≤ A ≤ 30.3, X ≤ 1.12468 × 10 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377, When 30.3<A≤42.5, X≤56.6 is satisfied.

17. A refrigerating machine oil for a refrigeration cycle device, which is a refrigerating machine oil for a refrigeration cycle device (1) used as a working fluid together with a refrigerant comprising trans-1,2-difluoroethylene HFO-1132(E), difluoromethane R32 and 2,3,3,3-tetrafluoropropene HFO-1234yf, wherein The refrigeration cycle device has a compressor (2) and is provided with a refrigerant circuit (10) for circulating the working fluid, Regarding the working fluid, Where S is defined as the ratio (in %) of the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil, that is, the first total weight, to the weight of the refrigerating machine oil, Where Q is defined as the ratio (in %) of the weight of the refrigerating machine oil to the total weight of HFO-1132(E), R32 and HFO-1234yf, that is, the second total weight, Where B is defined as the ratio (in %) of the total weight of HFO-1132(E) and R32 to the second total weight, Where Sb is defined as the ratio (in %) of the total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil, 40.0≤B≤75.0， Under the operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, The value of Y, expressed by Y=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sb+{B / (100-QS)}, satisfies -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Y, Given 40.0 ≤ B ≤ 53.6, Y ≤ 2.03558 × 10 -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B+36.0237, When 53.6<B≤75.0, Y≤100 is satisfied.

18. A refrigerating machine oil for a refrigeration cycle device, which is a refrigerating machine oil for a refrigeration cycle device (1) used as a working fluid together with a refrigerant comprising trans-1,2-difluoroethylene HFO-1132(E), difluoromethane R32 and 2,3,3,3-tetrafluoropropene HFO-1234yf, wherein The refrigeration cycle device has a compressor (2) and is provided with a refrigerant circuit (10) for circulating the working fluid, and the compressor (2) comprises a compression element (21) for compressing the refrigerant and an oil reservoir (37) for storing the refrigerating machine oil, Regarding the working fluid, Where T is defined as the ratio (in %) of the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil in the oil reservoir, that is, the third total weight, to the weight of the refrigerating machine oil in the oil reservoir, Where R is defined as the ratio (in %) of the weight of the refrigerating machine oil in the oil reservoir to the total weight of HFO-1132(E), R32 and HFO-1234yf, that is, the second total weight, Where A is defined as the ratio (in %) of the weight of HFO-1132(E) to the second total weight, Where Ta is defined as the ratio (in %) of the weight of HFO-1132(E) dissolved in the refrigerating machine oil in the oil reservoir to the weight of the refrigerating machine oil in the oil reservoir, 22.5≤A≤42.5， The weight of R32 is 21.0×A / 28 or more and 22.0×A / 28 or less relative to the second total weight, Under the operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, The value of Xa, expressed as Xa = [{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Ta+{A / (100-RT)}, satisfies -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527≤Xa, Given 22.5 ≤ A ≤ 30.3, Xa ≤ 1.12468 × 10 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A+20.377, when 30.3<A≤42.5, Xa≤56.6 is satisfied.

19. A refrigerating machine oil for a refrigeration cycle device, which is a refrigerating machine oil for a refrigeration cycle device (1) that is used as a working fluid together with a refrigerant comprising trans-1,2-difluoroethylene HFO-1132(E), difluoromethane R32 and 2,3,3,3-tetrafluoropropene HFO-1234yf, wherein the refrigeration cycle device has a compressor (2) and is provided with a refrigerant circuit (10) for the working fluid to circulate, and the compressor (2) includes a compression element (21) that compresses the refrigerant and an oil storage section (37) that stores the refrigerating machine oil, regarding the working fluid, let T be the ratio, in %, of the third total weight, which is the total weight of HFO-1132(E), R32 and HFO-1234yf dissolved in the refrigerating machine oil in the oil storage section, relative to the weight of the refrigerating machine oil in the oil storage section, let R be the ratio, in %, of the weight of the refrigerating machine oil in the oil storage section relative to the second total weight, which is the total weight of HFO-1132(E), R32 and HFO-1234yf, let B be the ratio, in %, of the total weight of HFO-1132(E) and R32 relative to the second total weight, and let Tb be the ratio, in %, of the total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil in the oil storage section relative to the weight of the refrigerating machine oil in the oil storage section, 40.0≤B≤75.0 is satisfied, under the operating conditions where the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, The value of Ya, expressed as Ya = [{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Tb+{B / (100-RT)}, satisfies -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≤Ya, Given 40.0 ≤ B ≤ 53.6, Ya ≤ 2.03558 × 10 -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B+36.0237, when 53.6<B≤75.0, Ya≤100 is satisfied.

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