Refrigeration cycle apparatus and refrigeration oil

Abstract

To provide a refrigeration cycle apparatus and a refrigeration oil that improve refrigeration capacity and performance factor.SOLUTION: An apparatus uses a working fluid containing a refrigerant that includes HFO-1132(E), R32, and HFO-1234yf, as well as refrigeration oil, and includes a compressor, and a refrigerant circuit in which the working fluid circulates. Regarding the working fluid, S (%) is 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 (hereinafter referred to as TW), Q (%) is the ratio of the weight of refrigeration oil to TW, A (%) is the ratio of the weight of HFO-1132(E) to TW, and Sa (%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigeration oil to the weight of the refrigeration oil. When 22.5≤A≤42.5, under specific operating conditions, the value of X, represented by X=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sa+{A / (100-QS)}, satisfies a specific range.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a refrigeration cycle device and a refrigerating machine oil. [Background technology]

[0002] BACKGROUND ART In recent years, in order to suppress global warming, the use of refrigerants with low global warming potential (GWP) as refrigerants for use in refrigeration cycle devices such as air conditioners has been considered.

[0003] For example, Patent Document 1 (JP 2015-200480 A) proposes the use of refrigerants with low GWP, such as ethylene-based hydrogen fluorides such as trans-1,2,difluoroethylene (HFO-1132(E)), and propylene-based fluorohydrocarbons such as difluoromethane (R32) and 2,3,3,3-tetrafluoropropene (HFO-1234yf). DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] Here, when a mixed refrigerant containing HFO-1132(E), R32, and HFO-1234yf is used as the refrigerant, the solubilities of HFO-1132(E), R32, and HFO-1234yf in the refrigeration oil used as a lubricant in the compressor differ, and it has become clear that this results in a difference in the composition of the refrigerant filled in the refrigerant circuit and the composition of the refrigerant circulating when the refrigeration cycle is performed in the refrigerant circuit.

[0005] Therefore, when a mixed refrigerant containing HFO-1132(E), R32, and HFO-1234yf is used together with a refrigerating machine oil, it is desirable to improve the refrigeration capacity and coefficient of performance. [Means for solving the problem]

[0006] The refrigeration cycle device according to the first aspect is a refrigeration cycle device using a working fluid including a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), and refrigeration oil, and includes a refrigerant circuit. The refrigerant circuit has a compressor through which the working fluid circulates. For 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 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. When 30.3 < A ≤ 42.5, X ≤ 56.6 is satisfied. Further, 22.5 ≤ A ≤ 42.5 is satisfied. The weight of R32 with respect 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 with respect to the weight of the refrigeration oil in the first total weight. The first total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigeration oil. Q(%) is the ratio of the weight of the refrigeration oil with respect 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) with respect to the second total weight. Sa(%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigeration oil with respect to the weight of the refrigeration oil.

[0007] Here, the first total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit that are dissolved in the refrigerant oil, but not the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit. Also, the second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit, and is a value unrelated to whether or not they are dissolved in the refrigerant oil.

[0008] In this refrigeration cycle device, it is possible to ensure a ratio (refrigeration capacity ratio) of 90% or more of the refrigeration capacity of the refrigerant circulating through the refrigerant circuit without dissolving in refrigerating machine oil to the refrigeration capacity calculated when the refrigerant with the refrigerant composition filled in the refrigerant circuit is assumed to circulate through the refrigerant circuit. Furthermore, it is possible to ensure a ratio (coefficient of performance ratio) of 99% or more of the COP calculated when the refrigerant with the refrigerant composition filled in the refrigerant circuit is assumed to circulate through the refrigerant circuit without dissolving in refrigerating machine oil.

[0009] A refrigeration cycle device according to a second aspect is the refrigeration cycle device of the first aspect, in which Sa (%) under operating conditions is 5.7 or more.

[0010] In this refrigeration cycle device, it is possible to maintain good lubrication performance in the compressor.

[0011] A refrigeration cycle apparatus according to a third aspect is the refrigeration cycle apparatus according to the first or second aspect, wherein under the above operating conditions, -4 ×A 2 +9.34385×10 -1 ×A-1.18947≦X is further satisfied.

[0012] This refrigeration cycle device can ensure a refrigeration capacity ratio of 95% or more.

[0013] A refrigeration cycle apparatus according to a fourth aspect is the refrigeration cycle apparatus according to the first or second aspect, further satisfying A≦X under the above operating conditions.

[0014] In this refrigeration cycle device, it is possible to ensure a refrigeration capacity ratio of 100% or more.

[0015] A refrigeration cycle apparatus according to a fifth aspect is a refrigeration cycle apparatus using a working fluid containing a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), and refrigerating machine oil, and is provided with a refrigerant circuit. The refrigerant circuit has a compressor, through which the working fluid circulates. 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)}, is -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 -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2When 53.6 < B ≤ 75.0 and it satisfies ×B + 36.0237, then Y ≤ 100. Further, 40.0 ≤ B ≤ 75.0. Here, S(%) is the ratio with respect to the weight of the refrigerating machine oil of the first total weight. 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 with respect 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 with respect 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 with respect to the weight of the refrigerating machine oil.

[0016] Here, the first total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigerating machine oil among those filled in the refrigerant circuit, and not the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit. Also, the second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit, and is a value independent of the presence or absence of dissolution in the refrigerating machine oil.

[0017] In this refrigeration cycle device, it is possible to ensure that the ratio of the refrigeration capacity (refrigeration capacity ratio) of the refrigerant circulating in the refrigerant circuit without dissolving in the refrigerating machine oil to the refrigeration capacity grasped when assuming that the refrigerant of the refrigerant composition filled in the refrigerant circuit circulates in the refrigerant circuit is 90% or more. Further, it is possible to ensure that the ratio of the coefficient of performance (coefficient of performance ratio) of the refrigerant circulating in the refrigerant circuit without dissolving in the refrigerating machine oil to the coefficient of performance grasped when assuming that the refrigerant of the refrigerant composition filled in the refrigerant circuit circulates in the refrigerant circuit is 99% or more.

[0018] The refrigeration cycle device according to the sixth aspect is the refrigeration cycle device of the fifth aspect, and under the above operating conditions, -2.62798×10 -4 ×B 2 +9.34385×10 -1×B-2.10281≦Y is further satisfied.

[0019] This refrigeration cycle device can ensure a refrigeration capacity ratio of 95% or more.

[0020] A refrigeration cycle apparatus according to a seventh aspect is the refrigeration cycle apparatus of the fifth aspect, further satisfying B≦Y under the above operating conditions.

[0021] In this refrigeration cycle device, it is possible to ensure a refrigeration capacity ratio of 100% or more.

[0022] A refrigeration cycle apparatus according to an eighth aspect is the refrigeration cycle apparatus according to any one of the first aspect to the seventh aspect, in which S(%) under operating conditions is 10 or more.

[0023] In this refrigeration cycle device, the lubrication performance of the compressor is maintained at a good level when the refrigerant is compressed.

[0024] A refrigeration cycle apparatus according to a ninth aspect is the refrigeration cycle apparatus according to any one of the first to eighth aspects, 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. This refrigeration cycle apparatus further satisfies 20≦Q≦60.

[0025] In this refrigeration cycle device, The refrigeration cycle device according to the 10th aspect is a refrigeration cycle device using a working fluid containing a refrigerant including trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), and refrigeration oil, and includes a refrigerant circuit. The refrigerant circuit has a compressor through which the working fluid circulates. The compressor includes a compression element that compresses the refrigerant and an oil sump portion in which the refrigeration oil is stored. For 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 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 -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. Further,​​​Here, the third total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit that is dissolved in the refrigerating machine oil in the oil reservoir, not the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit. Also, the second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit, and is a value unrelated to whether or not they are dissolved in the refrigerating machine oil.

[0027] In this refrigeration cycle device, it is possible to ensure a ratio (refrigeration capacity ratio) of 90% or more of the refrigeration capacity of the refrigerant circulating through the refrigerant circuit without dissolving in refrigerating machine oil to the refrigeration capacity calculated when the refrigerant with the refrigerant composition filled in the refrigerant circuit is assumed to circulate through the refrigerant circuit. Furthermore, it is possible to ensure a ratio (coefficient of performance ratio) of 99% or more of the COP calculated when the refrigerant with the refrigerant composition filled in the refrigerant circuit is assumed to circulate through the refrigerant circuit without dissolving in refrigerating machine oil.

[0028] A refrigeration cycle apparatus according to an eleventh aspect is a refrigeration cycle apparatus using a working fluid containing a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), and refrigerating machine oil, and is provided with a refrigerant circuit. The refrigerant circuit has a compressor, through which the working fluid circulates. 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 Ya, expressed as Ya=[{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Tb+{B / (100-RT)}, is -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914≦Ya. Furthermore, when 40.0≦B≦53.6, Ya≦2.03558×10 -5 ×B4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B + 36.0237 is satisfied. Also, when 53.6 < B ≤ 75.0, Ya ≤ 100 is satisfied. Furthermore, 40.0 ≤ B ≤ 75.0 is satisfied. Here, T(%) is the ratio with respect to the weight of the refrigeration oil in the oil sump of the third total weight. The third total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigeration oil in the oil sump. R(%) is the ratio of the weight of the refrigeration oil in the oil sump with respect 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 with respect to the second total weight. Tb(%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigeration oil in the oil sump with respect to the weight of the refrigeration oil in the oil sump.

[0029] Here, the third total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigeration oil in the oil sump among those filled in the refrigerant circuit, and is not the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit. Also, the second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit, and is a value independent of the presence or absence of dissolution in the refrigeration oil.

[0030] In this refrigeration cycle device, it is possible to ensure that the ratio of the refrigeration capacity (refrigeration capacity ratio) of the refrigerant that circulates through the refrigerant circuit without dissolving in the refrigeration oil to the refrigeration capacity grasped when assuming that the refrigerant of the refrigerant composition filled in the refrigerant circuit circulates through the refrigerant circuit is 90% or more. Furthermore, it is possible to ensure that the ratio of the coefficient of performance (coefficient of performance ratio) of the refrigerant that circulates through the refrigerant circuit without dissolving in the refrigeration oil to the coefficient of performance grasped when assuming that the refrigerant of the refrigerant composition filled in the refrigerant circuit circulates through the refrigerant circuit is 99% or more.

[0031] A refrigeration cycle apparatus according to a twelfth aspect is the refrigeration cycle apparatus according to the tenth or eleventh aspect, in which T(%) under the above operating conditions is 10 or more.

[0032] In this refrigeration cycle device, the lubrication performance of the compressor is maintained at a good level when the refrigerant is compressed.

[0033] A refrigeration cycle apparatus according to a thirteenth aspect is the refrigeration cycle apparatus according to any one of the tenth to twelfth aspects, 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. This refrigeration cycle apparatus further satisfies 20≦R≦60.

[0034] A refrigeration cycle apparatus according to a fourteenth aspect is the refrigeration cycle apparatus according to any one of the first aspect to the thirteenth aspect, wherein the second total weight of the refrigerant is 95% or more.

[0035] The second total weight of the refrigerant is preferably 99% or more, and more preferably 99.5% or more.

[0036] A refrigeration cycle device according to a fifteenth aspect is a refrigeration cycle device according to any one of the first to fourteenth aspects, wherein the refrigeration oil contains at least one selected from the group consisting of polyol ester (POE), polyvinyl ether (PVE), and polyalkylene glycol (PAG).

[0037] The refrigeration oil of the refrigeration cycle device according to the 16th aspect is the refrigeration oil of the refrigeration cycle device 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 and the working fluid circulates. 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 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. When 30.3 < A ≤ 42.5, X ≤ 56.6. Further, 22.5 ≤ A ≤ 42.5 is satisfied. The weight of R32 with respect 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 with respect to the weight of the refrigeration oil of the first total weight. The first total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigeration oil. Q(%) is the ratio of the weight of the refrigeration oil with respect 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) with respect to the second total weight. Sa(%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigeration oil with respect to the weight of the refrigeration oil.

[0038] Here, the first total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit that are dissolved in the refrigerant oil, but not the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit. Also, the second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit, and is a value unrelated to whether or not they are dissolved in the refrigerant oil.

[0039] With this refrigeration cycle device, it is possible to ensure a ratio (refrigeration capacity ratio) of 90% or more of the refrigeration capacity of the refrigerant circulating through the refrigerant circuit without dissolving in the refrigerant oil to the refrigeration capacity assumed when the refrigerant with the refrigerant composition filled in the refrigerant circuit circulates through the refrigerant circuit.Furthermore, it is possible to ensure a ratio (coefficient of performance ratio) of 99% or more of the refrigeration capacity of the refrigerant circulating through the refrigerant circuit without dissolving in the refrigerant oil to the refrigeration capacity assumed when the refrigerant with the refrigerant composition filled in the refrigerant circuit circulates through the refrigerant circuit.

[0040] A refrigeration oil for a refrigeration cycle apparatus according to a seventeenth aspect 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 apparatus includes a refrigerant circuit. The refrigerant circuit has a compressor, through which a working fluid circulates. 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)} is -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 -5 ×B 4 -1.04176×10 -3 ×B3 +2.01822×10 -2 ×B 2 -3.18195×10 -2 ×B + 36.0237 is satisfied, and when 53.6 < B ≤ 75.0, Y ≤ 100 is satisfied. Further, 40.0 ≤ B ≤ 75.0 is satisfied. Here, S(%) is the ratio with respect to the weight of the refrigeration oil of the first total weight. The first total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigeration oil. Q(%) is the ratio of the weight of the refrigeration oil with respect 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 with respect to the second total weight. Sb(%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigeration oil with respect to the weight of the refrigeration oil.

[0041] Here, the first total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigeration oil among those filled in the refrigerant circuit, and is not the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit. Also, the second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit, and is a value independent of the presence or absence of dissolution in the refrigeration oil.

[0042] According to the refrigeration oil of this refrigeration cycle device, it is possible to ensure that the ratio of the refrigeration capacity grasped for the refrigerant that circulates in the refrigerant circuit without dissolving in the refrigeration oil to the refrigeration capacity grasped when assuming that the refrigerant of the refrigerant composition filled in the refrigerant circuit circulates in the refrigerant circuit (refrigeration capacity ratio) is 90% or more. Further, it is possible to ensure that the ratio of the coefficient of performance grasped for the refrigerant that circulates in the refrigerant circuit without dissolving in the refrigeration oil to the coefficient of performance grasped when assuming that the refrigerant of the refrigerant composition filled in the refrigerant circuit circulates in the refrigerant circuit (coefficient of performance ratio) is 99% or more.

[0043] The refrigeration oil of the refrigeration cycle device according to the 18th aspect is the refrigeration oil of the refrigeration cycle device 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 through which the working fluid circulates. The compressor includes a compression element that compresses the refrigerant and an oil sump where the refrigeration oil is stored. For 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 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 -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 with respect to the second total weight is not less than 21.0×A / 28 and not more than 22.0×A / 28. Here, T(%) is the ratio with respect to the weight of the refrigeration oil in the oil sump of the third total weight. The third total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigeration oil in the oil sump. R(%) is the ratio of the weight of the refrigeration oil in the oil sump with respect 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) with respect to the second total weight. Ta(%) is the ratio of the weight of HFO-1132(E) dissolved in the refrigeration oil in the oil sump with respect to the weight of the refrigeration oil in the oil sump.

[0044] Here, the third total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit that is dissolved in the refrigerating machine oil in the oil reservoir, not the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit. Also, the second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled into the refrigerant circuit, and is a value unrelated to whether or not they are dissolved in the refrigerating machine oil.

[0045] With this refrigeration cycle device, it is possible to ensure a ratio (refrigeration capacity ratio) of 90% or more of the refrigeration capacity of the refrigerant circulating through the refrigerant circuit without dissolving in the refrigerant oil to the refrigeration capacity assumed when the refrigerant with the refrigerant composition filled in the refrigerant circuit circulates through the refrigerant circuit.Furthermore, it is possible to ensure a ratio (coefficient of performance ratio) of 99% or more of the refrigeration capacity of the refrigerant circulating through the refrigerant circuit without dissolving in the refrigerant oil to the refrigeration capacity assumed when the refrigerant with the refrigerant composition filled in the refrigerant circuit circulates through the refrigerant circuit.

[0046] A refrigeration oil for a refrigeration cycle apparatus according to a nineteenth aspect 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 apparatus includes a refrigerant circuit. The refrigerant circuit has a compressor, and a working fluid circulates through the refrigerant circuit. The compressor includes a compression element that compresses the refrigerant, and an oil reservoir in which the refrigeration oil is stored. 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 as Ya=[{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Tb+{B / (100-RT)}, is -4.78507×10 -4 ×B 2 +8.71607×10 -1It satisfies Ya ≤ -4.19914 + B. 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. Also, when 53.6 < B ≤ 75.0, Ya ≤ 100 is satisfied. Further, 40.0 ≤ B ≤ 75.0 is satisfied. Here, T(%) is the ratio with respect to the weight of the refrigerant oil in the oil sump of the third total weight. The third total weight is the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigerant oil in the oil sump. R(%) is the ratio of the weight of the refrigerant oil in the oil sump with respect 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 with respect to the second total weight. Tb(%) is the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigerant oil in the oil sump with respect to the weight of the refrigerant oil in the oil sump.

[0047] Here, the third total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigerant oil in the oil sump among those filled in the refrigerant circuit, and is not the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit. Also, the second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit, and is a value independent of the presence or absence of dissolution in the refrigerant oil.

[0048] With this refrigeration cycle device, it is possible to ensure a ratio (refrigeration capacity ratio) of 90% or more of the refrigeration capacity of the refrigerant circulating through the refrigerant circuit without dissolving in the refrigerant oil to the refrigeration capacity assumed when the refrigerant with the refrigerant composition filled in the refrigerant circuit circulates through the refrigerant circuit.Furthermore, it is possible to ensure a ratio (coefficient of performance ratio) of 99% or more of the refrigeration capacity of the refrigerant circulating through the refrigerant circuit without dissolving in the refrigerant oil to the refrigeration capacity assumed when the refrigerant with the refrigerant composition filled in the refrigerant circuit circulates through the refrigerant circuit. [Brief explanation of the drawings]

[0049] [Figure 1] FIG. 1 is a schematic diagram of a refrigeration cycle device. [Figure 2] FIG. 2 is a schematic cross-sectional view of a compressor. [Figure 3] 1 is a graph showing a line connecting plots of aQS against Q. [Figure 4] 1 is a graph showing an approximate formula of aQS with respect to Q. [Figure 5] This is a graph showing the relationship between X and A. [Figure 6] 10 is a graph showing the value of X relative to Sa for each Q. [Figure 7] 10 is a graph showing the relationship between Y and B. [Figure 8] 10 is a graph showing the value of Y relative to Sb for each Q. DETAILED DESCRIPTION OF THE INVENTION

[0050] Hereinafter, embodiments of a refrigeration cycle device and a refrigerating machine oil for a refrigeration cycle device according to the present disclosure will be described.

[0051] (1) Refrigeration cycle equipment The refrigeration cycle device 1 of this embodiment performs heat load treatment by performing a vapor compression refrigeration cycle operation. The refrigeration cycle device 1 includes a refrigerant circuit 10.

[0052] The refrigerant circuit 10 has a compressor 2, a first heat exchanger 3, an expansion valve 4, and a second heat exchanger 5, and is filled with a working fluid including a refrigerant and refrigerating machine oil.

[0053] The compressor 2, first heat exchanger 3, expansion valve 4, and second heat exchanger 5 are connected in this order via refrigerant piping in a refrigerant circuit 10. The refrigerant circuit 10 has a switching valve 6 for switching between a connection state enabling a first operation in which the first heat exchanger 3 functions as a refrigerant radiator and the second heat exchanger 5 functions as a refrigerant evaporator, and a connection state enabling a second operation in which the first heat exchanger 3 functions as a refrigerant evaporator and the second heat exchanger 5 functions as a refrigerant radiator. The first operation is, for example, a cooling operation, and the second operation is, for example, a heating operation.

[0054] The compressor 2 is a positive displacement compressor or the like that is driven by a compressor motor, and has a compression element 21 and an oil reservoir 37. The compressor motor may be driven by receiving a supply of electric power via, for example, an inverter device (not shown).

[0055] The expansion valve 4 is capable of adjusting the valve opening, for example, and thereby is capable of adjusting the pressure of the refrigerant passing through it.

[0056] The refrigeration cycle device 1 includes a microcomputer, a memory, etc., and a control unit 7 for controlling the driving of various actuators. The control unit 7 can control the operating state of the compressor 2, the opening degree of the expansion valve 4, etc.

[0057] The refrigeration cycle device 1 is not particularly limited, and examples thereof include cooling devices for room air conditioners, packaged air conditioners, refrigerators, automotive air conditioners, water heaters, dehumidifiers, freezers, refrigerated and frozen warehouses, vending machines, showcases, chemical plants, etc.

[0058] (2) Compressor The compressor 2 is not particularly limited, and various types of compressors such as a scroll compressor or a rotary compressor can be used.

[0059] Here, a scroll compressor as shown in FIG. 2 will be taken as an example for explanation.

[0060] The compressor 2 includes a casing 20, a compression element 21, a drive motor 24, a crankshaft 25, a lower bearing 26, a balance weight 30, an oil reservoir 37, and the like.

[0061] The casing 20 includes a cylindrical member 20a having a generally cylindrical shape with open top and bottom, and an upper cover 20b and a lower cover 20c provided at the upper and lower ends of the cylindrical member 20a. The casing 20 accommodates components of the compressor 2, including the compression element 21, drive motor 24, crankshaft 25, and lower bearing 26. An oil reservoir 37 is formed within the casing 20 from its lower end to a predetermined height. The oil reservoir 37 includes an oil reservoir space 37a for storing refrigeration oil for lubricating the compression element 21 and other components. The oil reservoir 37 is provided with an oil temperature sensor 38 for detecting the temperature of the stored refrigeration oil. An intake pipe 12 is provided at the top of the casing 20, penetrating the upper cover 20b. The intake pipe 12 draws in low-pressure gas refrigerant in the refrigeration cycle of the refrigerant circuit 10 and supplies the gas refrigerant to the compression element 21. The lower end of the intake pipe 12 is connected to the fixed scroll 22 of the compression element 21. The suction pipe 12 communicates with the compression chamber Sc of the compression element 21. A discharge pipe 13, through which refrigerant passes to be discharged to the outside of the casing 20, is provided in the middle of the cylindrical member 20a of the casing 20. An end of the discharge pipe 13 inside the casing 20 is disposed so as to protrude into a high-pressure space Sh formed below the housing 27 of the compression element 21. The high-pressure refrigerant in the refrigeration cycle after being compressed by the compression element 21 flows through the discharge pipe 13.

[0062] The compression element 21 mainly includes a housing 27, a fixed scroll 22 disposed above the housing 27, and a movable scroll 23 that is combined with the fixed scroll 22 to form a compression chamber Sc.

[0063] The fixed scroll 22 has a flat fixed end plate 22a, a spiral fixed wrap 22b protruding downward from the lower surface of the fixed end plate 22a, and an outer edge portion 22c surrounding the fixed wrap 22b. A non-circular discharge port 22d communicating with the compression chamber Sc of the compression element 21 is formed in the center of the fixed end plate 22a and penetrates the fixed end plate 22a in the thickness direction. Refrigerant compressed in the compression chamber Sc is discharged from the discharge port 22d, passes through refrigerant passages (not shown) formed in the fixed scroll 22 and the housing 27, and flows into the high-pressure space Sh. The compressor 2 is a high-pressure dome-type compressor in which high-pressure refrigerant is present in a region of the casing 20 outside the compression element 21.

[0064] The movable scroll 23 has a flat movable end plate 23a, a spiral movable wrap 23b protruding upward from the upper surface of the movable end plate 23a, and a cylindrical boss portion 23c protruding from the back surface of the movable end plate 23a. The fixed wrap 22b of the fixed scroll 22 and the movable wrap 23b of the movable scroll 23 are combined with each other such that the lower surface of the fixed end plate 22a faces the upper surface of the movable end plate 23a. A compression chamber Sc is formed between the adjacent fixed wrap 22b and movable wrap 23b. As the movable scroll 23 revolves relative to the fixed scroll 22 as described below, the volume of the compression chamber Sc changes periodically, and the compression element 21 draws, compresses, and discharges refrigerant. The boss portion 23c is a cylindrical portion with a closed upper end. The movable scroll 23 and the crankshaft 25 are connected by inserting an 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 communicates with the high-pressure space Sh via an 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 end plate 23a in the eccentric space 28 upward toward the fixed scroll 22. This force brings the movable scroll 23 into close contact with the fixed scroll 22. The movable scroll 23 is supported by the housing 27 via an Oldham ring 29 arranged in an "Oldham ring space Sr." The Oldham ring 29 is a member that prevents the movable scroll 23 from rotating on its axis and allows it to revolve. By using the Oldham ring 29, when the crankshaft 25 rotates, the movable scroll 23 connected to the crankshaft 25 at the boss portion 23c revolves relative to the fixed scroll 22 without rotating, and the refrigerant in the compression chamber Sc is compressed.

[0065] The housing 27 is press-fitted into the cylindrical member 20a and fixed to the cylindrical member 20a along its entire outer circumferential surface. The housing 27 and the fixed scroll 22 are fixed together so that the upper end surface of the housing 27 is in close contact with the lower surface of the outer peripheral portion 22c of the fixed scroll 22. The housing 27 has a recess 27a recessed in the center of its upper surface and an upper bearing portion 27b disposed below the recess 27a. The side surface of the eccentric portion space 28 is defined by the inner surface of the recess 27a. An upper bearing 35, which is 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 rotatably supports the main shaft 25a inserted in the upper bearing 35. The housing 27 also has an Oldham ring space Sr in which an Oldham ring 29 is disposed.

[0066] The drive motor 24 has an annular stator 33 fixed to the inner wall surface of the cylindrical member 20a, and a rotor 32 rotatably housed inside the stator 33 with a small gap (air gap passage) between them. The stator 33 is configured with a coil. The rotor 32 is connected to the movable scroll 23 via a crankshaft 25 arranged to extend in the vertical direction along the axis of the cylindrical member 20a. As the rotor 32 rotates, the movable scroll 23 revolves relative to the fixed scroll 22.

[0067] The crankshaft 25 transmits the driving force of the drive motor 24 to the movable scroll 23. The crankshaft 25 is disposed to extend vertically along the axis of the cylindrical member 20a and connects the rotor 32 of the drive motor 24 to the movable scroll 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 with respect 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 23. A pin bearing 31, which is a cylindrical metal member that supports the eccentric portion 25b, is provided radially outward of the eccentric portion 25b. The main shaft 25a is rotatably 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. 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 refrigeration 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 in an oil reservoir space 37a of an oil reservoir 37 formed in the lower part of the casing 20, and the refrigeration oil in the oil reservoir space 37a is supplied to the compression element 21 and the like through the oil supply path 39.

[0068] The balance weight 30 is a separate member from the crankshaft 25, has an annular shape, and is fitted onto the main shaft 25a. The balance weight 30 has a cylindrical portion 30a and an eccentric portion 30b formed on a portion of the circumferential direction of the cylindrical portion 30a. The center of gravity of the entire balance weight 30 is eccentric in a predetermined direction from the axis of the crankshaft 25. The movable scroll 23 is slidably supported near its center by the eccentric portion 25b of the crankshaft 25. As a result, the movable scroll 23 is also eccentric in the same direction as the eccentric portion 25b.

[0069] The lower bearing 26 is disposed below the drive motor 24. The lower bearing 26 is fixed to the lower inside of the cylindrical member 20a. The lower bearing 26 constitutes a bearing on the lower end side of the crankshaft 25 and is a cylindrical metal member that rotatably supports the main shaft 25a of the crankshaft 25.

[0070] The compressor 2 described above operates as follows.

[0071] First, when the drive motor 24 is started, the rotor 32 rotates relative to the stator 33, thereby rotating the crankshaft 25 fixed to the rotor 32. As the crankshaft 25 rotates, the movable scroll 23 connected to the crankshaft 25 revolves relative to the fixed scroll 22. Then, low-pressure gas refrigerant in the refrigeration cycle passes through the suction pipe 12 and is drawn into the compression chamber Sc from the peripheral edge side of the compression chamber Sc. As the movable scroll 23 revolves, communication between the suction pipe 12 and the compression chamber Sc is lost. Then, as the volume of the compression chamber Sc decreases, the pressure in the compression chamber Sc begins to rise.

[0072] The refrigerant in the compression chamber Sc is compressed as the volume of the compression chamber Sc decreases, and finally becomes high-pressure gas refrigerant. The high-pressure gas refrigerant is discharged from the discharge port 22d located near the center of the fixed-side end plate 22a. The high-pressure gas refrigerant then passes through a refrigerant passage (not shown) formed in the fixed scroll 22 and the housing 27, and flows into the high-pressure space Sh. The high-pressure gas refrigerant in the refrigeration cycle that has flowed into the high-pressure space Sh and been compressed by the compression element 21 is discharged from the discharge pipe 13.

[0073] (3) Refrigerating machine oil The refrigerant circuit 10 is filled with refrigerant and refrigerating machine oil.

[0074] Known refrigerating machine oils can be used together with the refrigerant. As the refrigerating machine oil, it is preferable to use at least one or two or more selected from the group consisting of polyol ester (POE), polyvinyl ether (PVE), and polyalkylene glycol (PAG).

[0075] The refrigerating machine oil may contain, for example, a known acid scavenger, extreme pressure agent, or antioxidant.

[0076] The solubilities of HFO-1132(E), R32, and HFO-1234yf in refrigerating machine oils can be adjusted, for example, by adjusting the molecular structure of the organic compounds contained in the refrigerating machine oil, such as the number of carbon atoms and the presence or absence of branching. For example, when the refrigerating machine oil contains a polyol ester, the solubility of HFO-1132(E), the solubility of R32, and the solubility of HFO-1234yf can be adjusted by changing the number of carbon atoms and the branching structure of the carbon chain of the fatty acid constituting the polyol ester, or the number of carbon atoms, the number of hydroxyl groups, and the branching structure of the carbon chain of the polyhydric alcohol constituting the polyol ester. Furthermore, when the refrigerating machine oil contains a polyvinyl ether, the solubility of HFO-1132(E), the solubility of R32, and the solubility of HFO-1234yf can be adjusted by changing the number of carbon atoms, the branching structure, and the functional groups of the side chains constituting the polyol ether. Furthermore, when the refrigeration oil contains a polyalkylene glycol, the solubility of HFO-1132(E), the solubility of R32, and the solubility of HFO-1234yf can each be adjusted by changing the ratio of propylene oxide to ethylene oxide that constitutes the polyalkylene glycol.These polyol esters, polyvinyl ethers, and polyalkylene glycols can be, for example, known or commercially available refrigeration oil products.

[0077] (4) Refrigerant The refrigerant used in the refrigeration cycle device 1 includes trans-1,2-difluoroethylene (HFO-1132(E)), R32, and 2,3,3,3-tetrafluoropropene (HFO-1234yf).

[0078] 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.

[0079] In addition, it is preferable that 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.

[0080] (5) Relationship between refrigerant and refrigerating machine oil (5-1) Regarding the refrigerating machine oil in the entire refrigerant circuit (5-1-1) Regarding the case based on the weight ratio of HFO-1132(E) In this embodiment, for the working fluid containing the refrigerant and the refrigerating machine oil, 22.5 ≦ A ≦ 42.5, and the weight of R32 with respect 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, for 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 -4 ×A 4 -3.25583×10 -3 ×A 3 +3.56792×10 -2 ×A 2 -3.18195×10 -2 ×A + 20.377. Also, when 30.3 < A ≦ 42.5, X ≦ 56.6 is satisfied.

[0081] 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, to the weight of the refrigerating machine oil. Note that the first total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit 10 that are dissolved in the refrigerating machine oil, and is not the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit 10.

[0082] Q (%) is the ratio of the weight of the refrigerating machine oil to the second total weight, which is the total weight of HFO-1132(E), R32, and HFO-1234yf. The second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit 10, and is a value that is unrelated to whether or not they dissolve in the refrigerating machine oil.

[0083] A (%) is the weight ratio of HFO-1132(E) to the second total weight.

[0084] 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.

[0085] In this specification, "·" and "×" may be used, and both "·" and "×" mean a product.

[0086] According to this refrigeration cycle device 1, it is possible to ensure a ratio (refrigeration capacity ratio) of 90% or more of the refrigeration capacity determined for the refrigerant circulating through the refrigerant circuit 10 without dissolving in refrigerating machine oil to the refrigeration capacity determined when a refrigerant with a refrigerant composition filled in the refrigerant circuit 10 is assumed to circulate through the refrigerant circuit 10. Furthermore, it is possible to ensure a ratio (coefficient of performance ratio) of 99% or more of the COP determined for the refrigerant circulating through the refrigerant circuit 10 without dissolving in refrigerating machine oil to the COP determined when a refrigerant with a refrigerant composition filled in the refrigerant circuit 10 is assumed to circulate through the refrigerant circuit.

[0087] The weight of R32 relative to the second total weight is between 21.0 × A / 28 and 22.0 × A / 28, which is a narrow range. Therefore, within this range, even if the ratio of R32 to HFO-1132(E) changes slightly, the refrigeration capacity and the coefficient of performance will be substantially equivalent.

[0088] Furthermore, since A is 22.5 or more, it is easy to ensure refrigeration capacity, and since A is 42.5 or less, combustion of the refrigerant is suppressed even in the unlikely event of a leak.

[0089] In order to ensure a refrigeration capacity ratio of 95% or more, under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa, the -4 ×A 2 +9.34385×10 -1 It is preferable that the relationship ×A−1.18947≦X is further satisfied.

[0090] Furthermore, from the viewpoint of ensuring a refrigeration capacity ratio of 100% or more, it is preferable to further satisfy A≦X under the above operating conditions where the refrigerant discharge temperature is 66° C. and the discharge pressure is 2.1 MPa.

[0091] The refrigerant and refrigeration oil used in the refrigeration cycle device 1 preferably have a weight ratio of HFO-1132(E) in the refrigerant of 27% or more and 29% or less, a weight ratio of R32 in the refrigerant of 20.5% or more and 22.5% or less, and a weight ratio of HFO-1234yf in the refrigerant of 49.5% or more and 51.5% or less, and satisfy 20≦Q≦60.

[0092] Here, from the viewpoint of maintaining good lubrication performance in the compressor 2 when the refrigerant is compressed, it is preferable that S (%) is 10 or more under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa.

[0093] From the viewpoint of maintaining good lubrication performance in the compressor 2 when the refrigerant is compressed, it is preferable that Sa(%) is 5.7 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.

[0094] (5-1-2) Regarding the case based on the total weight ratio of HFO-1132(E) and R32 In this embodiment, for the working fluid containing the refrigerant and the refrigeration oil, 40.0 ≦ B ≦ 75.0. Further, for 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, when 40.0 ≦ B ≦ 53.6, Y ≦ 2.03558×10 -5 ×B 4 -1.04176×10 -3 ×B 3 +2.01822×10 -2 ×B [[ID=2३]] 2 -3.18195×10 -2 ×B + 36.0237 is satisfied. Also, when 53.6 < B ≦ 75.0, Y ≦ 100 is satisfied.

[0095] Here, S(%) is, as in (5-1-1), the ratio of the weight of the refrigeration oil in the first total weight.

[0096] Q(%) is, as in (5-1-1), the ratio of the weight of the refrigeration oil to the second total weight.

[0097] [[ID=ģ7]] B(%) is the ratio of the total weight of HFO-1132(E) and R32 to the second total weight.

[0098] 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.

[0099] According to this refrigeration cycle device 1, it is possible to ensure a ratio (refrigeration capacity ratio) of 90% or more of the refrigeration capacity determined for the refrigerant circulating through the refrigerant circuit 10 without dissolving in refrigerating machine oil to the refrigeration capacity determined when a refrigerant with a refrigerant composition filled in the refrigerant circuit 10 is assumed to circulate through the refrigerant circuit 10. Furthermore, it is possible to ensure a ratio (coefficient of performance ratio) of 99% or more of the COP determined for the refrigerant circulating through the refrigerant circuit 10 without dissolving in refrigerating machine oil to the COP determined when a refrigerant with a refrigerant composition filled in the refrigerant circuit 10 is assumed to circulate through the refrigerant circuit.

[0100] Furthermore, since B is 40 or more, it is easy to ensure refrigeration capacity, and since B is 75 or less, combustion of the refrigerant is suppressed even in the unlikely event of a leak.

[0101] In order to ensure a refrigeration capacity ratio of 95% or more, under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa, -2.62798 × 10 -4 ×B 2 +9.34385×10 -1 It is preferable that the relationship ×B−2.10281≦Y is further satisfied.

[0102] Furthermore, from the viewpoint of ensuring a refrigeration capacity ratio of 100% or more, it is preferable to further satisfy B≦Y under the above operating conditions where the refrigerant discharge temperature is 66° C. and the discharge pressure is 2.1 MPa.

[0103] The refrigerant and refrigeration oil used in the refrigeration cycle device 1 preferably have a weight ratio of HFO-1132(E) in the refrigerant of 27% or more and 29% or less, a weight ratio of R32 in the refrigerant of 20.5% or more and 22.5% or less, and a weight ratio of HFO-1234yf in the refrigerant of 49.5% or more and 51.5% or less, and satisfy 20≦Q≦60.

[0104] Here, from the viewpoint of maintaining good lubrication performance in the compressor 2 when the refrigerant is compressed, it is preferable that S (%) is 10 or more under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa.

[0105] (Test Example 1) By determining the refrigeration capacity ratio and coefficient of performance ratio corresponding to the weight percentage (%) of HFO-1132(E) in the refrigerant circulating without dissolving in the refrigerant oil among the refrigerant filled in the refrigerant circuit 10, the conditions under which a refrigeration capacity ratio of 90% or more and a coefficient of performance ratio of 99% or more were identified. Furthermore, the conditions under which a refrigeration capacity ratio of 95% or more and a coefficient of performance ratio of 99% or more, and conditions under which a refrigeration capacity ratio of 100% or more and a coefficient of performance ratio of 99% or more were identified.

[0106] The weight percentage (%) of HFO-1234yf in the refrigerant circulating without dissolving in the refrigeration oil was calculated by subtracting the total weight percentage (%) of HFO-1132(E) and R32 from 100(%).

[0107] Specifically, in addition to the above S, Q, A, and Sa, the following parameters were used: In the following, S (%) represents the ratio of the weight of refrigerant dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil in the refrigerant circuit 10, Q (%) represents the ratio of the weight of refrigerating machine oil to the weight of refrigerant in the refrigerant circuit 10, A (%) represents the ratio of the weight of HFO-1132(E) to the weight of refrigerant in the refrigerant circuit 10, and Sa (%) represents the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil in the refrigerant circuit 10.

[0108] The composition of the refrigerant filled in the refrigerant circuit 10 was HFO-1132(E) / R32 / HFO-1234yf=A / A' / F (wt %), where A is the same as above.

[0109] The refrigerant charge amount, which is the weight of the refrigerant charged into the refrigerant circuit 10, is defined as Wr (g). Thus, the weight of HFO-1132(E) charged into the refrigerant circuit 10 is expressed as Wr·A(g). Furthermore, the weight of HFO-1234yf charged into the refrigerant circuit 10 is expressed as Wr·F(g). Note that the weight of R32 charged into the refrigerant circuit 10 is used in a certain relationship with the weight of HFO-1132(E), so Wr·A'(g) = Wr·(A·21.5 / 28)(g).

[0110] The amount of oil, which is the weight of the refrigerating machine oil filled in the refrigerant circuit 10, was designated as Wo (g).

[0111] The ratio of the weight of R32 dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil in the refrigerant circuit 10 was defined as Sa', and was expressed as Sa'=Sa·(21.5 / 28).

[0112] The ratio of the weight of HFO-1234yf dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil in the refrigerant circuit 10 was taken as Sf, and was expressed as Sf=S−Sa−Sa′.

[0113] Here, the weight of the refrigerant dissolved in the refrigerating machine oil in the refrigerant circuit 10 is represented as Wro(g) and expressed as Wro(g) = Wo·S. The weight of HFO-1132(E) dissolved in the refrigerating machine oil in the refrigerant circuit 10 is represented as Wo·Sa. The weight of R32 dissolved in the refrigerating machine oil in the refrigerant circuit 10 is represented as Wo·Sa'. The weight of HFO-1234yf dissolved in the refrigerating machine oil in the refrigerant circuit 10 is represented as Wo·Sf.

[0114] The weight of the refrigerant circulating within the refrigerant circuit 10 without dissolving in the refrigerating machine oil is expressed as Wr-Wro (g). The weight of HFO-1132(E) circulating within the refrigerant circuit 10 without dissolving in the refrigerating machine oil is expressed as Wr·A-Wo·Sa, the weight of R32 circulating within the refrigerant circuit 10 without dissolving in the refrigerating machine oil is expressed as Wr·A'-Wo·Sa', and the weight of HFO-1234yf circulating within the refrigerant circuit 10 without dissolving in the refrigerating machine oil is expressed as Wr·F-Wo·Sf.

[0115] In this case, if the weight percentage (%) of HFO-1132(E) in the refrigerant circulating in the refrigerant circuit 10 without dissolving in the refrigerating machine oil is X, it can be expressed as follows. X = (Wr A - Wo Sa) / (Wr - Wro) =(Wr·A-Wo·Sa) / (Wr·A-Wo·Sa+Wr·A'-Wo·Sa'+Wr·F-Wo·Sf) =(Wr·A-Wo·Sa) / (Wr·A-Wo·Sa+Wr·A'-Wo·Sa'+Wr·(100-A-A')-Wo·(S-Sa-Sa')) =(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))) =(Wr·A-Wo·Sa) / (Wr·100-Wo·S) =(Wr·A) / (Wr·100-Wo·S)-(Wo·Sa) / (Wr·100-Wo·S)

[0116] Then, this X can be expressed as follows using the coefficients "aQS" and "bQS". X = aQS·Sa + bQS

[0117] Here, aQS = -(Wo) / (Wr·100-Wo·S), and bQS = (Wr·A) / (Wr·100-Wo·S).

[0118] Here, "aQS" can be expressed as follows by approximating the line obtained by plotting the aQS values ​​when the value of Q is changed for each value of S (see Figure 3) to the approximate curve shown in Figure 4. Note that Figures 3 and 4 illustrate the case where A is 32.5%, S is changed in the range of 10 to 100%, and Q is changed in the range of 10 to 90%. aQS={(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1

[0119] Furthermore, "bQS" can be expanded as follows: bQS=(Wr A) / (Wr 100-Wo S) =(Wr·A / Wr)) / (Wr·100 / Wr-Wo·S / Wr) =A / (100-Wo S / Wr) =A / (100-Q S)

[0120] From the above, X can finally be expressed as follows: X = aQS·Sa + bQS =[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]·Sa+{A / (100-Q·S)}

[0121] Here, HFO-1132(E) and R32 have similar solubilities in refrigerating machine oil and tend to dissolve in refrigerating machine oil at a constant ratio, while HFO-1132(E), R32, and HFO-1234yf tend to be dissimilar. In this case, if HFO-1132(E) and R32 dissolve in refrigerating machine oil in large amounts, reducing the total concentration of HFO-1132(E) and R32 in the refrigerant circulating through the refrigerant circuit 10, the refrigeration capacity tends to decrease. Therefore, when the refrigeration capacity calculated assuming that a refrigerant with the refrigerant composition charged in the refrigerant circuit 10 circulates through the refrigerant circuit 10 is 100, the ratio of the refrigeration capacity of the refrigerant circulating through the refrigerant circuit 10 without dissolving in the refrigerating machine oil (refrigeration capacity ratio) can be expressed as a function using A, which is the weight fraction of HFO-1132(E) in the charged refrigerant. To ensure a refrigeration capacity ratio of 90% or more, X must satisfy the following relationship with A: If the compressor 2 used in the refrigeration cycle device 1 is a capacity-controllable one, it becomes possible to compensate for the decrease in refrigeration capacity while minimizing the degree of decrease in compressor efficiency. X ≧ -8.45932 × 10 -4 ×A 2 +8.71607×10 -1 ×A-2.37527

[0122] Furthermore, when a large amount of HFO-1234yf dissolves in the refrigeration oil and the concentrations of HFO-1132(E) and R32 in the refrigerant circulating in the refrigerant circuit 10 increase, the coefficient of performance tends to decrease. Therefore, when the coefficient of performance grasped assuming that the refrigerant of the refrigerant composition filled in the refrigerant circuit 10 circulates through the refrigerant circuit 10 is 100, the ratio of the coefficient of performance grasped for the refrigerant that circulates through the refrigerant circuit 10 without dissolving in the refrigeration oil (coefficient of performance ratio) can be expressed as a function using A which is the ratio of the weight of HFO-1132(E) in the filled refrigerant. And in order to ensure that the coefficient of performance ratio is 99% or more, X needs to satisfy the following in relation to A. Note that the coefficient of performance is mainly determined by the composition of the refrigerant circulating through the refrigerant circuit 10, but when a heat medium supply device such as a fan capable of controlling the supply amount of a heat medium such as air is provided for the first heat exchanger 3 and the second heat exchanger 5, it becomes possible to compensate for the decrease in the coefficient of performance. When 22.5 ≦ A ≦ 30.3: X ≦ 1.12468×10 -4 ×A<00s0117>-3.25583×10 -3 ×A 3 +3.56792×10<00sk0120>×A 2 -3.18195×10 -2 ×A + 20.377 When 30.3 < A ≦ 42.5: X ≦ 56.6

[0123] From the above, it has become clear that in order to ensure that the refrigerating capacity ratio is 90% or more and the coefficient of performance ratio is 99% or more, X needs to satisfy the following relationship. <00006s6>When 22.5 ≦ A ≦ 30.3: -8.qs932×10 -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 When 30.3 < A ≤ 42.5: -8.45932×10 -4 ×A 2 +8.71607×10 -1 ×A - 2.37527 ≤ X ≤ 56.6

[0124] In addition, in order to ensure that the refrigerating capacity ratio is 95% or more, it is necessary to satisfy the following. If the compressor 2 used in the refrigeration cycle device 1 is capable of capacity control, it is possible to compensate for the decrease in the refrigerating capacity while maintaining good compressor efficiency. X ≥ -4.64589×10 -4 ×A 2 +9.34385×10 -1 ×A - 1.18947

[0125] In addition, in order to ensure that the refrigerating capacity ratio is 100% or more, it is necessary to satisfy the following. X ≥ A

[0126] Figure 5 is a graph showing the relationship between X and A.

[0127] In the graph of Figure 5, the working fluid in which HFO-1132(E) and R32 dissolve more in the refrigeration oil and the refrigerating capacity ratio decreases is shown as going downward. Also, in the graph of Figure 5, the working fluid in which HFO-1234yf dissolves more in the refrigeration oil and the coefficient of performance ratio decreases is shown as going upward.

[0128] Note that the line (1) shown in FIG. 5 is a line with a refrigerating capacity ratio of 90%, indicating that below this line, the refrigerating capacity ratio will be less than 90%. The line (2) shown in FIG. 5 is a line with a refrigerating capacity ratio of 95%, indicating that below this line, the refrigerating capacity ratio will be less than 95%. The line (3) shown in FIG. 5 is a line with a refrigerating capacity ratio of 100%, indicating that below this line, the refrigerating capacity ratio will be less than 100%. The line (4) shown in FIG. 5 is a line with a coefficient of performance ratio of 99%, indicating that above this line, the coefficient of performance ratio will be less than 99%. In FIG. 5, the hatched area is a range that ensures a refrigerating capacity ratio of 90% or more and a coefficient of performance ratio of 99% or more, and is a range of 22.5 wt% or more, which is preferable from the viewpoint of ensuring the refrigerating capacity as the value of A, and 42.5 wt% or less, which is preferable from the viewpoint of suppressing flammability. It is a range of 56.6 wt% or less, which is the preferable weight ratio of HFO-1132(E) in the refrigerant circulating through the refrigerant circuit 10 without dissolving in the refrigerating machine oil (the upper limit of X when 30.3 < A ≤ 42.5).

[0129] FIG. 6 is a graph showing the value of X with respect to Sa for each Q.

[0130] Note that in FIG. 6, taking the case where A is 28% and S is 60% as an example, the case where Q is changed in the range of 1~90% is illustrated. The dotted line (I) shown in FIG. 6 indicates the lower limit value line of X required to ensure a refrigerating capacity ratio of 90% or more. The dotted line (2) shown in FIG. 6 indicates the lower limit value line of X required to ensure a refrigerating capacity ratio of 95% or more. The dotted line (3) shown in FIG. 6 indicates the lower limit value line of X required to ensure a refrigerating capacity ratio of 100% or more. The dotted line (4) shown in FIG. 6 indicates the upper limit value line of X required to ensure a coefficient of performance ratio of 99% or more.

[0131] In Fig. 6, Sa is preferably 5.7% by weight or more from the viewpoint of maintaining good lubrication performance in the compressor 2. The hatched range in Fig. 6 indicates a preferred range in which good lubrication performance in the compressor 2 is maintained while ensuring a refrigeration capacity ratio of 90% or more and a coefficient of performance ratio of 99% or more. The upper limit of Sa in this hatching is 33.9% by weight because Fig. 6 illustrates an example in which S is 60%, and HFO-1132(E) and R32 tend to dissolve at a ratio of 28:21.5.

[0132] 4, 5 and 6, it is possible to understand the behavior of each parameter when the other parameters are changed.

[0133] The refrigeration capacity (cooling capacity, sometimes written as capacity) and coefficient of performance (COP) of the mixed refrigerant of HFO-1132(E), R32 and HFO-1234yf were determined by performing theoretical calculations of the refrigeration cycle of the mixed refrigerant under the following conditions using the Reference Fluid Thermodynamic and Transport Properties Database (REFPROP 10.0) created by the National Institute of Science and Technology (NIST). Evaporation temperature: 5℃ Condensation temperature: 45℃ Superheat degree: 5K Supercooling degree: 5K Compressor efficiency: 70%

[0134] The formula for calculating refrigeration capacity and COP is as follows: Refrigeration capacity = refrigerant circulation amount x refrigeration effect enthalpy difference COP = refrigeration effect enthalpy difference / compression work enthalpy difference

[0135] (Test Example 2) In the above Test Example 1, an example was given in which each parameter was calculated, focusing on the tendency for HFO-1132(E) and R32 to be used in a certain relationship.

[0136] In contrast, in Test Example 2 described below, since HFO-1132(E) and R32 tend to behave similarly, HFO-1132(E) and R32 were treated as a single refrigerant and each parameter was calculated.

[0137] In Test Example 2, conditions were identified that enable a refrigerating capacity ratio of 90% or more and a COP of 99% or more to be ensured by determining the refrigerating capacity ratio and COP of 99% or more corresponding to the total weight percentage (%) of HFO-1132(E) and R32 in the refrigerant circulating without dissolving in the refrigerant oil among the refrigerants filled in the refrigerant circuit 10. Furthermore, conditions were identified that enable a refrigerating capacity ratio of 95% or more and a COP of 99% or more to be ensured, and conditions that enable a refrigerating capacity ratio of 100% or more and a COP of 99% or more to be ensured.

[0138] The weight percentage (%) of HFO-1234yf in the refrigerant circulating without dissolving in the refrigeration oil was calculated by subtracting the total weight percentage (%) of HFO-1132(E) and R32 from 100(%).

[0139] Specifically, while the above S and Q were used in the same way, B was used instead of A, Sb was used instead of Sa, and the following parameters were also used: In the following, S (%) was the ratio of the weight of refrigerant dissolved in the refrigerant oil to the weight of the refrigerant in the refrigerant circuit 10, and Q (%) was the ratio of the weight of the refrigerant oil to the weight of the refrigerant in the refrigerant circuit 10. B (%) was the ratio of the total weight of HFO-1132(E) and R32 to the weight of the refrigerant in the refrigerant circuit 10, and Sb (%) was the ratio of the total weight of HFO-1132(E) and R32 dissolved in the refrigerant oil to the weight of the refrigerant in the refrigerant circuit 10.

[0140] The composition of the refrigerant filled in the refrigerant circuit 10 was HFO-1132(E)+R32 / HFO-1234yf=B / F (wt %), where B is the same as above.

[0141] The refrigerant charge amount, which is the weight of the refrigerant charged into the refrigerant circuit 10, is represented as Wr (g). As a result, the total weight of HFO-1132(E) and R32 charged into the refrigerant circuit 10 is represented as Wr·B (g). Furthermore, the weight of HFO-1234yf charged into the refrigerant circuit 10 is represented as Wr·F (g).

[0142] The ratio of the weight of HFO-1234yf dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil in the refrigerant circuit 10 was taken as Sf, and was expressed as Sf=S−Sb.

[0143] Here, the weight of the refrigerant dissolved in the refrigerating machine oil in the refrigerant circuit 10 is represented as Wro(g) and expressed as Wro(g) = Wo·S. The total weight of HFO-1132(E) and R32 dissolved in the refrigerating machine oil in the refrigerant circuit 10 is represented as Wo·Sb. The weight of HFO-1234yf dissolved in the refrigerating machine oil in the refrigerant circuit 10 is represented as Wo·Sf.

[0144] The weight of the refrigerant circulating within the refrigerant circuit 10 without dissolving in the refrigerating machine oil is expressed as Wr-Wro (g). The total weight of HFO-1132(E) and R32 circulating within the refrigerant circuit 10 without dissolving in the refrigerating machine oil is expressed as Wr·B-Wo·Sb, and the weight of HFO-1234yf circulating within the refrigerant circuit 10 without dissolving in the refrigerating machine oil is expressed as Wr·F-Wo·Sf.

[0145] In this case, if the weight percentage (%) of the total of HFO-1132(E) and R32 in the refrigerant circulating in the refrigerant circuit 10 without dissolving in the refrigerating machine oil is Y, it can be expressed as follows: Y = (Wr B - Wo Sb) / (Wr - Wro) =(Wr·B-Wo·Sb) / (Wr·B-Wo·Sb+Wr·F-Wo·Sf) =(Wr·B-Wo·Sb) / (Wr·B-Wo·Sb+Wr·(100-B)-Wo·(S-Sb)) =(Wr·B-Wo·Sb) / (Wr·100-Wo·S) =(Wr·B-Wo·Sb) / (Wr·100-Wo·S) =(Wr·B) / (Wr·100-Wo·S)-(Wo·Sb) / (Wr·100-Wo·S)

[0146] Then, this Y can be expressed as follows using the coefficients "cQS" and "dQS". Y = cQS·Sb + dQS

[0147] Here, cQS = -(Wo) / (Wr·100-Wo·S), and cQS = (Wr·A) / (Wr·100-Wo·S).

[0148] Here, by obtaining an approximate formula for "cQS" in the same way as in Figures 3 and 4, we were able to express it as follows: cQS={(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1

[0149] Furthermore, "bQS" can be expanded as follows: bQS=(Wr B) / (Wr 100-Wo S) =(Wr·B / Wr)) / (Wr·100 / Wr-Wo·S / Wr) =B / (100-Wo S / Wr) =B / (100-Q S)

[0150] From the above, Y can finally be expressed as follows: Y = cQS·Sb + dQS =[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]·Sa+{B / (100-Q·S)}

[0151] Here, HFO-1132(E) and R32 have similar solubilities in refrigerating machine oil and tend to dissolve in refrigerating machine oil at a constant ratio, while HFO-1132(E), R32, and HFO-1234yf tend to be dissimilar. In this case, if HFO-1132(E) and R32 dissolve in refrigerating machine oil in large amounts, reducing the total concentration of HFO-1132(E) and R32 in the refrigerant circulating through the refrigerant circuit 10, the refrigeration capacity tends to decrease. Therefore, when the refrigeration capacity calculated assuming that a refrigerant with the refrigerant composition charged in the refrigerant circuit 10 circulates through the refrigerant circuit 10 is 100, the refrigeration capacity ratio (refrigeration capacity ratio) calculated for the refrigerant circulating through the refrigerant circuit 10 without dissolving in refrigerating machine oil can be expressed as a function using B, which is the weight ratio of the combined HFO-1132(E) and R32 in the charged refrigerant. To ensure a refrigeration capacity ratio of 90% or more, Y must satisfy the following relationship with B: If the compressor 2 used in the refrigeration cycle device 1 is a capacity-controllable one, it becomes possible to compensate for the decrease in refrigeration capacity while minimizing the degree of decrease in compressor efficiency. Y ≥ -4.78507 × 10 -4 ×B 2 +8.71607×10 -1 ×B-4.19914

[0152] Furthermore, when a large amount of HFO-1234yf dissolves in the refrigeration oil and the concentrations of HFO-1132(E) and R32 in the refrigerant circulating in the refrigerant circuit 10 increase, the coefficient of performance tends to decrease. Therefore, when the coefficient of performance grasped assuming that the refrigerant of the refrigerant composition filled in the refrigerant circuit 10 circulates through the refrigerant circuit 10 is 100, the ratio of the coefficient of performance grasped for the refrigerant that circulates through the refrigerant circuit 10 without dissolving in the refrigeration oil (coefficient of performance ratio) can be expressed as a function using B which is the ratio of the total weight of HFO-1132(E) and R32 in the filled refrigerant. And in order to ensure that the coefficient of performance ratio is 99% or more, Y needs to satisfy the following in relation to B. Note that the coefficient of performance is mainly determined by the composition of the refrigerant circulating through the refrigerant circuit 10, but when a heat medium supply device such as a fan capable of controlling the supply amount of a heat medium such as air is provided for the first heat exchanger 3 and the second heat exchanger 5, it becomes possible to compensate for the decrease in the coefficient of performance. When 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

[0153] From the above, it has become clear that in order to ensure that the refrigerating capacity ratio is 90% or more and the coefficient of performance ratio is 99% or more, Y needs to satisfy the following relationship. When 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 When 53.6 < B ≤ 75.0: -4.78507×10 -4 ×B 2 +8.71607×10 -1 ×B - 4.19914 ≤ Y ≤ 100

[0154] In addition, in order to ensure that the refrigerating capacity ratio is 95% or more, it is necessary to satisfy the following. If the compressor 2 used in the refrigeration cycle device 1 is capable of capacity control, it is possible to compensate for the decrease in the refrigerating capacity while maintaining good compressor efficiency. Y ≥ -2.62798×10 -4 ×B<00\00163>+9.34385×10 -1 ×B - 2.10281

[0155] In addition, in order to ensure that the refrigerating capacity ratio is 100% or more, it is necessary to satisfy the following. <00\00744>Y ≥ B<00\00745><00\00746><00\00747>Fig. 7 is a graph showing the relationship between Y and B. <00\00748><00\00749><00\00750>In the graph of Fig. 7, the lower the direction, the more HFO-1132(E) and R32 dissolve in the refrigeration oil, indicating a working fluid with a decreasing refrigerating capacity ratio. Also, in the graph of Fig. 7, the higher the direction, the more HFO-1234yf dissolves in the refrigeration oil, indicating a working fluid with a decreasing coefficient of performance ratio. <00\00751><00\00752><00\00753>Note that line (5) in FIG. 7 indicates a 90% refrigeration capacity ratio, below which the refrigeration capacity ratio falls below 90%. Line (6) in FIG. 7 indicates a 95% refrigeration capacity ratio, below which the refrigeration capacity ratio falls below 95%. Line (7) in FIG. 7 indicates a 100% refrigeration capacity ratio, below which the refrigeration capacity ratio falls below 100%. Line (8) in FIG. 7 indicates a 99% COP ratio, above which the COP ratio falls below 99%. The hatched range in FIG. 7 indicates a range of 40 wt% or more, which is preferable from the viewpoint of ensuring refrigeration capacity, and 75 wt% or less, which is preferable from the viewpoint of suppressing flammability, while ensuring a refrigeration capacity ratio of 90% or more and a COP of 99% or more.

[0159] FIG. 8 is a graph showing the value of Y relative to Sb for each Q.

[0160] Note that Figure 8 illustrates the case where Q is changed in the range of 10 to 90%, using the example where B is 49.5% and S is 60%. Dotted line (5) in Figure 8 indicates the lower limit of X required to ensure a refrigeration capacity ratio of 90% or more. Dotted line (6) in Figure 8 indicates the lower limit of X required to ensure a refrigeration capacity ratio of 95% or more. Dotted line (7) in Figure 8 indicates the lower limit of X required to ensure a refrigeration capacity ratio of 100% or more. Dotted line (8) in Figure 8 indicates the upper limit of X required to ensure a coefficient of performance ratio of 99% or more.

[0161] In Fig. 8, from the viewpoint of maintaining good lubrication performance in the compressor 2, S is preferably 10% by weight or more, and Sb is preferably 10% by weight or more. The hatched range in Fig. 8 indicates a preferred range in which good lubrication performance in the compressor 2 is maintained while ensuring a refrigeration capacity ratio of 90% or more and a coefficient of performance ratio of 99% or more. The upper limit of Sb in this hatching is 60% by weight because Fig. 8 illustrates an example in which S is 60%.

[0162] In addition, according to FIGS. 7 and 8 above, the behavior of other parameters when each parameter is changed can be grasped.

[0163] Note that the coefficient of performance and refrigerating capacity of the mixed refrigerant of HFO-1132(E), R32, and HFO-1234yf are the same as those in Test Example 1.

[0164] (5-2) Regarding the refrigerating oil in the oil sump of the compressor In the above (5-1), the examination of each parameter has been carried out by focusing on the whole of the refrigerating oil filled in the refrigerant circuit 10 as the refrigerating oil. However, most of the refrigerating oil in the refrigerant circuit 10 exists in the oil sump 37 of the compressor 2, and from the viewpoint that the amount of the refrigerating oil flowing out from the compressor 2 to other parts of the refrigerant circuit 10 can be substantially ignored, the relationship between the refrigerant and the refrigerating oil can also be specified as follows.

[0165] (5-2-1) Regarding the case based on the weight ratio of HFO-1132(E) For the working fluid containing the refrigerant and the refrigerating oil, 22.5 ≦ A ≦ 42.5. Further, for 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 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. 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. Also, when 30.3 < A ≦ 42.5, Xa ≦ 56.6 is satisfied.

[0166] Here, T (%) is the ratio of a 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 reservoir 37, to the weight of the refrigerating machine oil in the oil reservoir 37. The third total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit 10 that is dissolved in the refrigerating machine oil in the oil reservoir 37, and is not the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit 10.

[0167] R (%) is the ratio of the weight of the refrigeration oil in the oil reservoir 37 to the second total weight, which is the total weight of HFO-1132(E), R32, and HFO-1234yf. The second total weight means the total weight of HFO-1132(E), R32, and HFO-1234yf filled in the refrigerant circuit 10, and is a value that is unrelated to whether or not they dissolve in the refrigeration oil.

[0168] A (%) is the same as described in (5-1-1) and is the weight ratio of HFO-1132(E) to the second total weight.

[0169] 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 .

[0170] According to this refrigeration cycle device 1, it is possible to ensure a ratio (refrigeration capacity ratio) of 90% or more of the refrigeration capacity determined for the refrigerant circulating through the refrigerant circuit 10 without dissolving in refrigerating machine oil to the refrigeration capacity determined when a refrigerant with a refrigerant composition filled in the refrigerant circuit 10 is assumed to circulate through the refrigerant circuit 10. Furthermore, it is possible to ensure a ratio (coefficient of performance ratio) of 99% or more of the COP determined for the refrigerant circulating through the refrigerant circuit 10 without dissolving in refrigerating machine oil to the COP determined when a refrigerant with a refrigerant composition filled in the refrigerant circuit 10 is assumed to circulate through the refrigerant circuit.

[0171] The weight of R32 relative to the second total weight is between 21.0 × A / 28 and 22.0 × A / 28, which is a narrow range. Therefore, within this range, even if the ratio of R32 to HFO-1132(E) changes slightly, the refrigeration capacity and the coefficient of performance will be substantially equivalent.

[0172] Furthermore, since A is 22.5 or more, it is easy to ensure refrigeration capacity, and since A is 42.5 or less, combustion of the refrigerant is suppressed even in the unlikely event of a leak.

[0173] In order to ensure a refrigeration capacity ratio of 95% or more, under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa, the -4 ×A 2 +9.34385×10 -1 It is preferable that the relationship ×A−1.18947≦X is further satisfied.

[0174] Furthermore, from the viewpoint of ensuring a refrigeration capacity ratio of 100% or more, it is preferable to further satisfy A≦X under the above operating conditions where the refrigerant discharge temperature is 66° C. and the discharge pressure is 2.1 MPa.

[0175] The refrigerant and refrigeration oil used in the refrigeration cycle device 1 preferably have a weight ratio of HFO-1132(E) in the refrigerant of 27% or more and 29% or less, a weight ratio of R32 in the refrigerant of 20.5% or more and 22.5% or less, and a weight ratio of HFO-1234yf in the refrigerant of 49.5% or more and 51.5% or less, and satisfy 20≦R≦60.

[0176] Here, from the viewpoint of maintaining good lubrication performance in the compressor 2 when the refrigerant is compressed, it is preferable that T(%) is 10 or more under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa.

[0177] (5-2-2) When the total weight ratio of HFO-1132(E) and R32 is used as the standard For the working fluid containing refrigerant and refrigeration oil, 40 ≦ B ≦ 75. Further, for 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 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. Here, 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. Also, when 53.6 < B ≦ 75.0, Ya ≦ 100 is satisfied.

[0178] Here, T(%) is, similar to (5 - 2 - 1), the ratio of the weight of the refrigeration oil in the oil sump 37 of the third total weight.

[0179] R(%) is, similar to (5 - 2 - 1), the ratio of the weight of the refrigeration oil in the oil sump 37 to the second total weight.

[0180] B(%) is the ratio of the total weight of HFO - 1132(E) and R32 to the second total weight.

[0181] Tb(%) is the ratio of the total weight of HFO - 1132(E) and R32 dissolved in the refrigeration oil in the oil sump 37 to the weight of the refrigeration oil in the oil sump 37.

[0182] According to this refrigeration cycle device 1, it is possible to ensure a ratio (refrigeration capacity ratio) of 90% or more of the refrigeration capacity determined for the refrigerant circulating through the refrigerant circuit 10 without dissolving in refrigerating machine oil to the refrigeration capacity determined when a refrigerant with a refrigerant composition filled in the refrigerant circuit 10 is assumed to circulate through the refrigerant circuit 10. Furthermore, it is possible to ensure a ratio (coefficient of performance ratio) of 99% or more of the COP determined for the refrigerant circulating through the refrigerant circuit 10 without dissolving in refrigerating machine oil to the COP determined when a refrigerant with a refrigerant composition filled in the refrigerant circuit 10 is assumed to circulate through the refrigerant circuit.

[0183] Furthermore, since B is 40 or more, it is easy to ensure refrigeration capacity, and since B is 75 or less, combustion of the refrigerant is suppressed even in the unlikely event of a leak.

[0184] In order to ensure a refrigeration capacity ratio of 95% or more, under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa, -2.62798 × 10 -4 ×B 2 +9.34385×10 -1 It is preferable that the relationship ×B−2.10281≦Y is further satisfied.

[0185] Furthermore, from the viewpoint of ensuring a refrigeration capacity ratio of 100% or more, it is preferable to further satisfy B≦Y under the above operating conditions where the refrigerant discharge temperature is 66° C. and the discharge pressure is 2.1 MPa.

[0186] The refrigerant and refrigeration oil used in the refrigeration cycle device 1 preferably have a weight ratio of HFO-1132(E) in the refrigerant of 27% or more and 29% or less, a weight ratio of R32 in the refrigerant of 20.5% or more and 22.5% or less, and a weight ratio of HFO-1234yf in the refrigerant of 49.5% or more and 51.5% or less, and satisfy 20≦R≦60.

[0187] Here, from the viewpoint of maintaining good lubrication performance in the compressor 2 when the refrigerant is compressed, it is preferable that T(%) is 10 or more under the above operating conditions where the refrigerant discharge temperature is 66°C and the discharge pressure is 2.1 MPa.

[0188] (Addendum) Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as defined in the claims. [Explanation of symbols]

[0189] 1 Refrigeration cycle device 2 Compressor 10 Refrigerant circuit 21 compression elements 37 Oil reservoir [Prior art documents] [Patent documents]

[0190] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-200480

Claims

1. A refrigeration cycle device (1) using a working fluid containing a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a refrigerating machine oil, a refrigerant circuit (10) having a compressor (2) and through which the working fluid circulates; Regarding the working fluid, a ratio of a first total weight, which is a total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigerating machine oil, to the weight of the refrigerating machine oil is S (%); Q (%) represents a ratio of the weight of the refrigerating machine oil to a second total weight which is the total weight of HFO-1132(E), R32, and HFO-1234yf, The weight ratio of HFO-1132(E) to the second total weight is A (%), When the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil is Sa (%), 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 operating conditions in which the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, X=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sa+{A / (100-QS)} The value of X, expressed as -8.45932×10 －４ ×A ２ +8.71607×10 －１ ×A-2.37527≦X Fulfilling In the case of 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 If 30.3<A≦42.5, then X≦56.6 fulfill, Refrigeration cycle equipment.

2. Under the operating conditions, the Sa (%) is 5.7 or more; The refrigeration cycle device according to claim 1.

3. Under the operating conditions, -4.64589×10 －４ ×A ２ +9.34385×10 －１ ×A-1.18947≦X Further satisfying The refrigeration cycle device according to claim 1.

4. Under the operating conditions, A≦X Further satisfying The refrigeration cycle device according to claim 1.

5. A refrigeration cycle device (1) using a working fluid containing a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a refrigerating machine oil, a refrigerant circuit (10) having a compressor (2) and through which the working fluid circulates; Regarding the working fluid, a ratio of a first total weight, which is a total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigerating machine oil, to the weight of the refrigerating machine oil is S (%); Q (%) represents a ratio of the weight of the refrigerating machine oil to a second total weight which is the total weight of HFO-1132(E), R32, and HFO-1234yf, The ratio of the total weight of HFO-1132(E) and R32 to the second total weight is B (%), When 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 is Sb (%), 40.0≦B≦75.0, Under operating conditions in which the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, Y=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sb+{B / (100-QS)} The value of Y expressed as -4.78507×10 －４ ×B ２ +8.71607×10 －１ ×B-4.19914≦Y Fulfilling In the case of 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 If 53.6<B≦75.0, Y≦100 fulfill, Refrigeration cycle equipment.

6. Under the operating conditions, -2.62798×10 －４ ×B ２ +9.34385×10 －１ ×B-2.10281≦Y Further satisfying The refrigeration cycle device according to claim 5.

7. Under the operating conditions, B≦Y Further satisfying The refrigeration cycle device according to claim 5.

8. Under the operating conditions, the S (%) is 10 or more; The refrigeration cycle device according to any one of claims 1 to 7.

9. the weight percentage of HFO-1132(E) in the refrigerant is 27% or more and 29% or less, the weight percentage of R32 in the refrigerant is 20.5% or more and 22.5% or less, and the weight percentage of HFO-1234yf in the refrigerant is 49.5% or more and 51.5% or less, 20≦Q≦60 fulfill, The refrigeration cycle device according to any one of claims 1 to 7.

10. A refrigeration cycle device (1) using a working fluid containing a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a refrigerating machine oil, a compressor (2) including a compression element (21) for compressing the refrigerant and an oil reservoir (37) for storing the refrigeration oil, and a refrigerant circuit (10) through which the working fluid circulates; Regarding the working fluid, a ratio of a 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 reservoir, to the weight of the refrigerating machine oil in the oil reservoir is T (%); a ratio of the weight of the refrigeration oil in the oil reservoir to a second total weight which is the total weight of HFO-1132(E), R32, and HFO-1234yf is R (%); The weight ratio of HFO-1132(E) to the second total weight is A (%), When 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 is Ta (%), 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 operating conditions in which the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, Xa=[{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Ta+{A / (100-RT)} The value of Xa expressed as -8.45932×10 －４ ×A ２ +8.71607×10 －１ ×A-2.37527≦Xa Fulfilling In the case of 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 fulfill, Refrigeration cycle equipment.

11. A refrigeration cycle device (1) using a working fluid containing a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a refrigerating machine oil, a compressor (2) including a compression element (21) for compressing the refrigerant and an oil reservoir (37) for storing the refrigeration oil, and a refrigerant circuit (10) through which the working fluid circulates; Regarding the working fluid, a ratio of a 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 reservoir, to the weight of the refrigerating machine oil in the oil reservoir is T (%); a ratio of the weight of the refrigeration oil in the oil reservoir to a second total weight which is the total weight of HFO-1132(E), R32, and HFO-1234yf is R (%); The ratio of the total weight of HFO-1132(E) and R32 to the second total weight is B (%), When 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 is Tb (%), 40.0≦B≦75.0, Under operating conditions in which the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, Ya=[{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Tb+{B / (100-RT)} The value of Ya expressed as -4.78507×10 －４ ×B ２ +8.71607×10 －１ ×B-4.19914≦Ya Fulfilling In the case of 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 fulfill, Refrigeration cycle equipment.

12. Under the operating conditions, the T (%) is 10 or more; The refrigeration cycle device according to claim 10 or 11.

13. the weight percentage of HFO-1132(E) in the refrigerant is 27% or more and 29% or less, the weight percentage of R32 in the refrigerant is 20.5% or more and 22.5% or less, and the weight percentage of HFO-1234yf in the refrigerant is 49.5% or more and 51.5% or less, 20≦R≦60 fulfill, The refrigeration cycle device according to claim 10 or 11.

14. The second total weight of the refrigerant is 95% or more. A refrigeration cycle device according to any one of claims 1 to 7, 10 to 11.

15. The refrigerating machine oil contains at least one selected from the group consisting of polyol ester (POE), polyvinyl ether (PVE), and polyalkylene glycol (PAG). A refrigeration cycle device according to any one of claims 1 to 7, 10 to 11.

16. A 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), The refrigeration cycle device includes a compressor (2) and a refrigerant circuit (10) through which the working fluid circulates, Regarding the working fluid, a ratio of a first total weight, which is a total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigerating machine oil, to the weight of the refrigerating machine oil is S (%); Q (%) represents a ratio of the weight of the refrigerating machine oil to a second total weight which is the total weight of HFO-1132(E), R32, and HFO-1234yf, The weight ratio of HFO-1132(E) to the second total weight is A (%), When the ratio of the weight of HFO-1132(E) dissolved in the refrigerating machine oil to the weight of the refrigerating machine oil is Sa (%), 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 operating conditions in which the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, X=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sa+{A / (100-QS)} The value of X, expressed as -8.45932×10 －４ ×A ２ +8.71607×10 －１ ×A-2.37527≦X Fulfilling In the case of 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 If 30.3<A≦42.5, then X≦56.6 fulfill, Refrigerant oil for refrigeration cycle equipment.

17. A 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), The refrigeration cycle device includes a compressor (2) and a refrigerant circuit (10) through which the working fluid circulates, Regarding the working fluid, a ratio of a first total weight, which is a total weight of HFO-1132(E), R32, and HFO-1234yf dissolved in the refrigerating machine oil, to the weight of the refrigerating machine oil is S (%); Q (%) represents a ratio of the weight of the refrigerating machine oil to a second total weight which is the total weight of HFO-1132(E), R32, and HFO-1234yf, The ratio of the total weight of HFO-1132(E) and R32 to the second total weight is B (%), When 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 is Sb (%), 40.0≦B≦75.0, Under operating conditions in which the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, Y=[{(-1.3257S+1.0919) / (Q+233.27S-207.91)}+1]Sb+{B / (100-QS)} The value of Y expressed as -4.78507×10 －４ ×B ２ +8.71607×10 －１ ×B-4.19914≦Y Fulfilling In the case of 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 If 53.6<B≦75.0, Y≦100 fulfill, Refrigerant oil for refrigeration cycle equipment.

18. A 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), The refrigeration cycle device has a compressor (2) including a compression element (21) that compresses the refrigerant and an oil reservoir (37) in which the refrigeration oil is stored, and is provided with a refrigerant circuit (10) in which the working fluid circulates, Regarding the working fluid, a ratio of a 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 reservoir, to the weight of the refrigerating machine oil in the oil reservoir is T (%); a ratio of the weight of the refrigeration oil in the oil reservoir to a second total weight which is the total weight of HFO-1132(E), R32, and HFO-1234yf is R (%); The weight ratio of HFO-1132(E) to the second total weight is A (%), When 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 is Ta (%), 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 operating conditions in which the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, Xa=[{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Ta+{A / (100-RT)} The value of Xa expressed as -8.45932×10 －４ ×A ２ +8.71607×10 －１ ×A-2.37527≦Xa Fulfilling In the case of 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 fulfill, Refrigerant oil for refrigeration cycle equipment.

19. A 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), The refrigeration cycle device has a compressor (2) including a compression element (21) that compresses the refrigerant and an oil reservoir (37) in which the refrigeration oil is stored, and is provided with a refrigerant circuit (10) in which the working fluid circulates, Regarding the working fluid, a ratio of a 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 reservoir, to the weight of the refrigerating machine oil in the oil reservoir is T (%); a ratio of the weight of the refrigeration oil in the oil reservoir to a second total weight which is the total weight of HFO-1132(E), R32, and HFO-1234yf is R (%); The ratio of the total weight of HFO-1132(E) and R32 to the second total weight is B (%), When 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 is Tb (%), 40.0≦B≦75.0, Under operating conditions in which the discharge temperature of the refrigerant discharged from the compressor is 66°C and the discharge pressure is 2.1 MPa, Ya=[{(-1.3257T+1.0919) / (R+233.27T-207.91)}+1]Tb+{B / (100-RT)} The value of Ya expressed as -4.78507×10 －４ ×B ２ +8.71607×10 －１ ×B-4.19914≦Ya Fulfilling In the case of 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 fulfill, Refrigerant oil for refrigeration cycle equipment.

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