JP2009019164A - Refrigerant composition and refrigeration unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant composition capable of reducing global warming potential. <P>SOLUTION: The refrigerant composition comprises a first component consisting of 1,1,1,3,3-pentafluoropropane, a second component consisting of 1,1-difluoroethane, a third component consisting of hexafluoroethane, and a fourth component consisting of perfluoromethane. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a refrigerant composition and a refrigeration apparatus using the same. Specifically, the present invention relates to a refrigerant composition used as a mixed refrigerant in a refrigeration apparatus including a multi-stage cascade heat exchanger.

For example, Patent Document 1 discloses 1,1,1,3,3-pentafluoropropane (CF ₃ —CH ₂ —CHF) as a non-azeotropic refrigerant mixture used in a refrigeration apparatus including a multi-stage cascade heat exchanger. _2, a first component consisting of HFC245fa), a second component consisting of 1,1-difluoroethane _{(CH 3} -CHF 2, HFC152a), and a third component consisting of trifluoromethane _(CHF 3, HFC23), perfluoromethane A mixed refrigerant containing a fourth component composed of (CF ₄ , FC14), a fifth component composed of krypton (Kr), and a sixth component composed of argon (Ar) is disclosed.
Japanese Patent Laid-Open No. 2004-2492

  However, the refrigerant composition described in Patent Document 1 contains a relatively large amount of trifluoromethane having a relatively high global warming potential (hereinafter referred to as GWP) as an essential component. For this reason, there exists a problem that GWP as the whole refrigerant composition will become high.

  This invention is made | formed in view of this point, The place made into the objective is to provide the refrigerant | coolant composition which can reduce a global warming potential.

According to one aspect of the present invention, the refrigerant composition comprises:
A first component comprising 1,1,1,3,3-pentafluoropropane;
A second component comprising 1,1-difluoroethane;
A third component comprising hexafluoroethane (perfluoroethane), and
Contains a fourth component of perfluoromethane.

  According to this configuration, instead of trifluoromethane, which is an essential component (third component) in the refrigerant composition described in Patent Document 1, hexafluoroethane having a GWP value lower than that of trifluoromethane is used as a component. To do. In other words, the GWP of trifluoromethane is 11,700, and the GWP of hexafluoroethane is 9,200. (The GWP here is a legal construction ordinance on promotion of global warming countermeasures (April 7, 1999). According to Japanese Government Ordinance No. 143)). Therefore, GWP as the whole refrigerant composition is suppressed.

  The content of the first component is set to 5 to 40% by mole percentage, the content of the second component is set to 5 to 35% by mole percentage, and the content of the third component is The molar percentage may be set to 5 or more and 40% or less, and the content of the fourth component may be set to 10 to 45% by mole percentage.

  Here, hexafluoroethane, which is the third component, has a property that it is more easily aggregated (liquefied) than conventional trifluoromethane. Therefore, the content of hexafluoroethane can be reduced compared to the content when trifluoromethane is contained. As a result, the GWP of the third component alone is significantly reduced as compared with the conventional one, so that the GWP as the whole refrigerant composition is also greatly reduced as compared with the conventional one.

  The refrigerant composition may further include a fifth component made of krypton. Further, the content of the fifth component may be set to be more than 0 and 40% or less in terms of mole percentage. By further containing the fifth component, the ultimate temperature of the refrigeration apparatus using the refrigerant composition becomes lower.

  The refrigerant composition may further include a first additive composed of at least one of trifluoromethane and ethane. The content of the first additive may be set to more than 0 and 20% or less in terms of mole percentage.

  The third component, hexafluoroethane, has a relatively high melting point (−106.3 ° C.). For this reason, when the ultimate temperature of the refrigeration apparatus is set to −100 ° C. or lower, for example, the refrigerant pipe may solidify and close the pipe. Therefore, it is desirable not to add a large amount of hexafluoroethane.

  Therefore, a first additive composed of at least one of trifluoromethane and ethane may be further contained for the purpose of lowering the melting point of the third component. By carrying out like this, melting | fusing point of a 3rd component falls substantially, reducing the content of hexafluoroethane relatively.

  The refrigerant composition may further contain a second additive substantially consisting of methane. The content of the second additive may be set at a molar percentage exceeding 0 and not more than 10%.

  The refrigerant composition may further include a sixth component made of at least one of helium, neon, argon, and nitrogen. The content of the sixth component may be set at a molar percentage exceeding 0 and not exceeding 20%.

  By doing so, the temperature reached by the refrigeration apparatus further decreases.

  According to another aspect of the present invention, the refrigeration apparatus is a refrigeration apparatus including a refrigerant circuit in which the refrigerant composition circulates as a mixed refrigerant. The refrigerant circuit includes a compressor that compresses the mixed refrigerant, a condenser that cools and liquefies a relatively high boiling point refrigerant out of the compressed mixed refrigerant, and a liquefied mixed refrigerant that is relatively A plurality of gas-liquid separators that sequentially separate liquid refrigerants and gas refrigerants from high-boiling refrigerants to low-boiling refrigerants, and primary-side gas refrigerants separated by the gas-liquid separators, A cascade heat exchanger of a plurality of stages that cools by exchanging heat with a liquid refrigerant on the secondary side separated and reduced in pressure by a gas-liquid separator, and one of the cascade heat exchangers of the last stage of the plurality of stages A refrigerating cycle is configured by connecting an expander that decompresses the refrigerant having a relatively low boiling point that flows out from the secondary side and a main cooler that evaporates the decompressed refrigerant to each other through a refrigerant pipe.

  That is, the refrigerant composition is suitable for a mixed refrigerant used in a refrigeration apparatus having a multi-stage cascade heat exchanger.

  As described above, according to the present invention, GWP of the entire refrigerant composition can be reduced by using hexafluoroethane having a relatively low global warming potential (GWP) as a component.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows the overall configuration of the ultra-low temperature refrigeration apparatus 10. This ultra-low temperature refrigeration apparatus 10 generates cold at an ultra-low temperature level of −100 ° C. or lower using a non-azeotropic refrigerant mixture described later. Although not shown in the drawings, the ultra-low temperature refrigeration apparatus 10 is provided in, for example, a vacuum film forming apparatus, and a cryocoil 52 (to be described later) of the ultra-low temperature refrigeration apparatus 10 directly converts gas and moisture in the vacuum chamber of the vacuum apparatus to an ultra-low temperature level. This is used to capture the gas and the like and raise the vacuum level in the vacuum chamber in a short time.

  In FIG. 1, reference numeral 1 denotes a closed-cycle refrigerant circuit in which the mixed refrigerant is enclosed, and this refrigerant circuit 1 is formed by connecting various devices described below through refrigerant piping. A compressor 20 compresses the gas refrigerant, and a first oil separator 15 is connected to a discharge portion of the compressor 20. The first oil separator 15 separates the compressor lubricating oil mixed in the gas refrigerant discharged from the compressor 20 from the gas refrigerant, and the separated lubricating oil is supplied to the oil return pipe. 18 is returned to the suction side of the compressor 20. Connected to the refrigerant discharge portion of the first oil separator 15 is a water-cooled condenser 21 that cools and condenses the discharged gas refrigerant from the compressor 20 by heat exchange with the cooling water in the cooling water passage 11. The discharge side of the water-cooled condenser 21 is connected to the primary side of the auxiliary condenser 22 via a dryer 17 that removes moisture and contamination in the refrigerant. In the auxiliary condenser 22, the gas refrigerant from the water-cooled condenser 21 is supplied. It cools and condenses by exchanging heat with the low-temperature secondary reflux refrigerant sucked into the compressor 20. In this embodiment, the water-cooled condenser 21 and the auxiliary condenser 22 constitute a condenser, and the condensers 21 and 22 mainly condense the gas refrigerant having the highest boiling point temperature among the mixed refrigerants. It has come to liquefy. In addition, although the water cooling system using the water cooling capacitor | condenser 21 was shown here, it may replace with this and you may comprise in the system using an air cooling capacitor | condenser.

  A first gas-liquid separator 24 is connected to a primary-side discharge portion of the auxiliary capacitor 22, and the first gas-liquid separator 24 converts a gas-liquid mixed refrigerant from the auxiliary capacitor 22 into a liquid refrigerant and a gas. Separated into refrigerant. The gas refrigerant discharge part of the first gas-liquid separator 24 has the primary side of the cascade type first heat exchanger 25 and the liquid refrigerant discharge part has the same first heat exchange via the first capillary tube 26. The secondary side of the vessel 25 is connected to each other, and the liquid refrigerant separated by the first gas-liquid separator 24 is decompressed by the first capillary tube 26 and then supplied to the secondary side of the first heat exchanger 25. By evaporating, the primary side gas refrigerant is cooled by this evaporation, and among the mixed refrigerants, the gas refrigerant having the second highest boiling point temperature is mainly condensed and liquefied.

  Further, a second gas-liquid separator 30 is connected to the primary discharge portion of the first heat exchanger 25, and the gas from the first heat exchanger 25 is connected to the second gas-liquid separator 30. The liquid mixed refrigerant is separated into a liquid refrigerant and a gas refrigerant. The gas refrigerant discharge part of the second gas-liquid separator 30 has the primary side of the cascade type second heat exchanger 31, and the liquid refrigerant discharge part has the same second heat exchange via the second capillary tube 32. The secondary side of the vessel 31 is connected to each other, and the liquid refrigerant separated by the second gas-liquid separator 30 is decompressed by the second capillary tube 32 and then supplied to the secondary side of the second heat exchanger 31. By evaporating, the primary side gas refrigerant is cooled by this evaporation, and among the mixed refrigerants, the gas refrigerant having the third highest boiling point temperature is mainly condensed and liquefied.

  Further, in the same manner as the connection structure, a third gas-liquid separator 36, a third heat exchanger 37, and a third capillary tube 38 are also provided at the primary discharge portion of the second heat exchanger 31. A fourth gas-liquid separator 42, a fourth heat exchanger 43, and a fourth capillary tube 44 are connected to the discharge section on the primary side in the third heat exchanger 37 (these connection structures are described above). Since it is the same as the connection structure of the first gas-liquid separator 24, the first heat exchanger 25, and the first capillary tube 26, detailed description thereof is omitted), and the liquid separated by the third gas-liquid separator 36 The refrigerant is decompressed by the third capillary tube 38 and then supplied to the secondary side of the third heat exchanger 37 to evaporate. The primary side gas refrigerant is cooled by the evaporation, and the boiling point temperature of the mixed refrigerants. Is the fourth highest temperature gas refrigerant, mainly The liquefied refrigerant is condensed and liquefied, and the liquid refrigerant separated by the fourth gas-liquid separator 42 is decompressed by the fourth capillary tube 44 and then supplied to the secondary side of the fourth heat exchanger 43 to evaporate. Thus, the primary side gas refrigerant is cooled by heat exchange, and among the mixed refrigerants, the gas refrigerant having the fifth highest boiling point temperature is mainly condensed and liquefied.

  And the primary side of the subcooler (subcooler) 47 which consists of a heat exchanger is connected to the primary side discharge part in the said 4th heat exchanger 43, and the primary side discharge part of this subcooler 47 The refrigerant circuit connected to is branched into a main refrigerant circuit 2a and a sub refrigerant circuit 2b in the middle thereof.

  A fifth capillary tube 48 is interposed in the middle of the sub refrigerant circuit 2b, and its downstream end is connected to the secondary side of the same supercooler 47. The secondary side of the subcooler 47 is connected to the secondary side of the fourth heat exchanger 43 via a refrigerant circuit, and the refrigerant discharged from the fourth heat exchanger 43 is supplied to the subcooler 47. After passing through the primary side, a part of the pressure is reduced by the fifth capillary tube 48 of the sub refrigerant circuit 2b, the liquid refrigerant is supplied to the secondary side of the subcooler 47 and evaporated, and the heat of evaporation The gas refrigerant on the primary side is cooled.

  On the other hand, the main refrigerant circuit 2a is branched into first and second branch circuits 80 and 81 in the middle thereof.

  A first branch capillary tube 80a is connected to the first branch circuit 80 in series. The second branch circuit 81 is connected in series with an electromagnetic on-off valve 81b and a second branch capillary tube 81a in series from the upstream side. In the present embodiment, the first and second branch capillary tubes 80a and 81a are capillary tubes having different decompression capabilities. However, the first and second branch capillary tubes 80a and 81a may be capillary tubes having the same decompression ability.

  A cryocoil 52 constituting a main cooler is connected in series to the main refrigerant circuit 2a on the downstream side of the downstream end merging portion of both the first and second branch circuits 80 and 81. The downstream end is connected to a refrigerant circuit between the secondary side of the fourth heat exchanger 43 and the secondary side of the subcooler 47. As a result, the remaining refrigerant discharged from the primary side of the supercooler 47 is decompressed by the first branch capillary tube 80a or the first and second branch capillary tubes 80a and 81a, and then is stored in the cryocoil 52. By supplying and evaporating, for example, the gas and moisture in the vacuum chamber are cooled to an ultra-low temperature level of −100 ° C. or lower, and the vacuum level is increased by capturing the gas and moisture. .

  The secondary side of the subcooler 47 and the secondary sides of the fourth heat exchanger 43, the third heat exchanger 37, the second heat exchanger 31, the first heat exchanger 25, and the auxiliary condenser 22 are described. In order, the refrigerant pipes are connected in series, and the secondary side of the auxiliary capacitor 22 is connected to the suction side of the compressor 20, and the refrigerant gasified by evaporation in the mixed refrigerant is sucked into the compressor 20. .

  The condensers 21 and 22, the heat exchangers 25, 31, 37, and 43 and the supercooler 47 may be any of a double tube structure, a plate structure, and a shell and tube structure. Further, instead of the capillary tubes 26, 32, 38, 44, other decompression means such as an expansion valve can be used.

  In FIG. 1, reference numeral 60 denotes a defrost circuit that supplies high-temperature gas refrigerant (hot gas) discharged from the compressor 20 to the cryocoil 52 as it is, and the upstream ends thereof are the first oil separator 15 and the water-cooled condenser. 21 is connected to the refrigerant circuit between the first and second branch circuits 80 and 81, and the downstream end is connected to the main refrigerant circuit 2 a between the cryocoil 52.

  Reference numeral 61 denotes an electromagnetic on-off valve disposed in the middle of the defrost circuit 60, and reference numeral 62 denotes the defrost in the main refrigerant circuit 2a between the junction of the first and second branch circuits 80 and 81 and the cryocoil 52. It is an electromagnetic on-off valve arranged on the upstream side (the first and second branch circuits 80 and 81 side) from the connection position with the downstream end of the circuit 60.

  A second oil separator 16 for separating the compressor lubricating oil from the gas refrigerant is disposed between the upstream end of the defrost circuit 60 and the electromagnetic on-off valve 61. The lubricating oil separated by the second oil separator 16 is returned to the suction side of the compressor 20 through the oil return pipe 18 in the same manner as the first oil separator 15.

  Reference numeral 65 denotes a buffer tank for preventing an abnormal increase in the discharge pressure of the compressor 20 due to insufficiently condensed gas refrigerant at the start of operation of the cryogenic refrigeration apparatus 10. The vicinity of the electromagnetic on-off valve 61 of the defrost circuit 60, the upstream side of the branch position of the first and second branch circuits 80 and 81 in the main refrigerant circuit 2a, the outlet side of the cryocoil 52, and the fourth heat exchanger. First to third manual on-off valves 71, 72, 73 are disposed in the refrigerant circuit between the secondary side of 43 and the secondary side. These first to third manual opening / closing valves 71, 72, 73 are closed when the cryocoil 52 is replaced or maintained, so that the mixed refrigerant remaining in the circuit does not leak to the outside. .

  Further, a refrigerant supply line 70 for supplying a mixed refrigerant into the refrigerant circuit 1 of the cryogenic refrigeration apparatus 10 is provided in the refrigerant pipe between the outlet side of the cryocoil 52 and the secondary side of the fourth heat exchanger 43. Is connected. The refrigerant supply pipe 70 also serves as a discharge pipe for discharging the mixed refrigerant from the refrigerant circuit 1. The refrigerant supply pipe 70 is provided with a supply opening / closing valve 75 that opens when the refrigerant is supplied or discharged.

The mixed refrigerant sealed in the refrigerant circuit 1 is configured by mixing the following first to sixth component refrigerants. That is, the first component refrigerant is made of 1,1,1,3,3-pentafluoropropane (HFC245fa, CF ₃ —CH ₂ —CHF ₂ , boiling point 15.3 ° C.). The second component refrigerant is made of 1,1-difluoroethane (HFC152a, CH ₃ —CHF ₂ , boiling point −24.0 ° C.). The third component refrigerant is hexafluoroethane (FC116, C ₂ F ₆ , boiling point -78.3 ° C.). The fourth component refrigerant is composed of perfluoromethane (FC14, CF ₄ , boiling point-127.9 ° C.). The fifth component refrigerant is composed of krypton (Kr, boiling point −153.4 ° C.). The refrigerant of the sixth component is helium (He, boiling point -268.9 ° C.), argon (R740, Ar, boiling point-185.7 ° C.), neon (Ne, boiling point-246.1 ° C.) and nitrogen (N ₂ , Boiling point of 195.8 ° C.).

  In the mixed refrigerant, the first component refrigerant is contained in a molar percentage of 5 to 40 mol%, the second component refrigerant is contained in an amount of 5 to 35 mol%, and the third component refrigerant is contained in an amount of 5 to 40 mol%. The fourth component refrigerant is contained in an amount of 10 to 45 mol%, the fifth component refrigerant is contained in an amount of 0 to 40 mol%, and the sixth component refrigerant is contained in an amount of 0 to 20 mol%.

In addition, a first additive composed of at least one of trifluoromethane (HFC23, CHF ₃ , boiling point −82.1 ° C.) and ethane (C ₂ H ₆ , boiling point −89 ° C.) is added to the mixed refrigerant. And a second additive substantially consisting of methane (CH ₄ , boiling point −162 ° C.) is added.

  Among these, the 1st additive contains 0-20 mol%, and the 2nd additive contains 0-10 mol%.

  Next, the operation of the ultra-low temperature refrigeration apparatus 10 having the above configuration will be described. During operation of the cryogenic refrigeration apparatus 10, the defrost circuit 60 is closed by closing the electromagnetic on-off valve 61, and the main refrigerant circuit 2 a is opened by opening the electromagnetic on-off valve 62. Further, the second branch circuit 81 is opened by opening the electromagnetic on-off valve 81b. Thus, the mixed refrigerant discharged from the compressor 20 is cooled to, for example, about 20 ° C. by the secondary-side refrigerant that is cooled by the water-cooled condenser 21 and then returned to the compressor 20 by the auxiliary condenser 22. Thereby, most of the first component and the corresponding portion of the second component of the mixed refrigerant are mainly condensed and liquefied. This refrigerant is separated into a gas refrigerant and a liquid refrigerant in the first gas-liquid separator 24, and the liquid refrigerant evaporates on the secondary side of the first heat exchanger 25 after being depressurized by the first capillary tube 26. The gas refrigerant from the first gas-liquid separator 24 is cooled to, for example, about −30 ° C. by heat, and most of the second component and the corresponding portion of the third component of the mixed refrigerant are mainly condensed and liquefied. . Thereafter, similarly, in the second to fourth heat exchangers 31, 37, 43, the cooling temperatures are set to about −60 ° C., −90 ° C., and −100 ° C., respectively, and the boiling point temperature of the mixed refrigerant. The gas refrigerant is condensed and liquefied in order from the highest temperature. Thus, in the fourth heat exchanger 43, the portion corresponding to the fifth component and the portion corresponding to the sixth component of the mixed refrigerant are condensed.

  Then, the gas-liquid mixed refrigerant discharged from the primary side of the fourth heat exchanger 43 and containing the fifth component and the sixth component passes through the primary side of the subcooler 47 and then passes through the main refrigerant. The circuit 2a and the sub refrigerant circuit 2b are separated. Then, the refrigerant flowing into the sub refrigerant circuit 2b is decompressed by the fifth capillary tube 48 and then supplied to the secondary side of the subcooler 47 to evaporate. From this evaporative heat, the refrigerant is supercooled from the fourth heat exchanger 43. The refrigerant in the gas-liquid mixed state supplied to the primary side of the vessel 47 is further cooled to about -120 ° C, for example.

  The remaining refrigerant in the gas-liquid mixed state that flows into the main refrigerant circuit 2a after being discharged from the primary side of the subcooler 47 is opened by the electromagnetic on-off valve 81b, and the first and second branch capillary tubes 80a, Each of the branches branches to 81a and is depressurized. After the depressurization, it evaporates in the cryocoil 52 and imparts cooling to, for example, −150 ° C. or lower to the gas or moisture in the vacuum chamber.

  The refrigerant that has flowed out of the cryocoil 52 and the supercooler 47 is sequentially joined by the refrigerant decompressed by the capillary tubes 44, 38, 32, and 26, and from the fourth heat exchanger 43 to the first heat exchanger 25. The mixed refrigerant flowing into the auxiliary condenser 22 and flowing through the outer tubes as described above is cooled. Then, the refrigerant flows out of the auxiliary capacitor 22 and then returns to the compressor 20.

  As described above, according to the refrigerant composition (mixed refrigerant) according to the present embodiment, GWP as the entire mixed refrigerant is suppressed by using hexafluoroethane having a lower GWP value than trifluoromethane as a component. The Moreover, since the content of hexafluoroethane may be relatively small due to the property of being relatively easy to aggregate, the GWP as a whole of the mixed refrigerant is further reduced. Here, as described above, the content of hexafluoroethane is 5 to 40 mol% in terms of a mole percentage. More preferably, it is 5-30 mol%, More preferably, it is 5-20 mol%.

  In addition, since hexafluoroethane has a relatively high melting point, when used in the cryogenic refrigeration apparatus 10 as in the refrigeration apparatus of the present embodiment, there is a risk of solidification in the refrigerant pipe, but the mixing according to the present embodiment Since the refrigerant further contains the first additive composed of at least one of trifluoromethane and ethane, the content of hexafluoroethane can be further reduced. As a result, this is equivalent to a decrease in the substantial melting point of the third component of the mixed refrigerant and can be used as the mixed refrigerant of the ultra-low temperature refrigeration apparatus 10. Further, if hexafluoroethane and ethane are combined, the ethane content is relatively reduced. Therefore, it is possible to ensure the safety of the mixed refrigerant.

  The refrigeration apparatus to which the refrigerant composition (mixed refrigerant) according to the present invention can be applied is not limited to the above configuration. For example, in the present embodiment, in the first to fourth heat exchangers 25, 31, 37, and 43, the refrigerant that goes to the cryocoil 52 is returned to the primary side, and the refrigerant that recirculates from the cryocoil 52 to the compressor 20 is secondary. In contrast to this, the refrigerant directed to the cryocoil 52 may be introduced to the secondary side, and the refrigerant returning from the cryocoil 52 to the compressor 20 may be introduced to the primary side. Of course. Moreover, it is good also as a structure which combined these separately.

  Moreover, although the system which performs gas-liquid separation 4 steps was shown in this embodiment, it replaces with this and the refrigerant composition of this invention can be used also for the system which performs gas-liquid separation 3 steps or less or 5 steps or more. . In that case, what is necessary is just to adjust the component of a refrigerant | coolant composition suitably.

  As described above, since the present invention can reduce the global warming potential, it is useful for a refrigerant composition used in, for example, an ultra-low temperature refrigeration apparatus.

It is a refrigerant | coolant system | strain diagram which shows the whole structure of the freezing apparatus which concerns on embodiment of this invention.

Explanation of symbols

1 Refrigerant circuit 10 Ultra-low temperature refrigeration system 20 Compressor 21 Water-cooled condenser (condenser)
22 Auxiliary condenser (condenser)
24 1st gas-liquid separator 25 1st heat exchanger 30 2nd gas-liquid separator 31 2nd heat exchanger 36 3rd gas-liquid separator 37 3rd heat exchanger 42 4th gas-liquid separator 43 4th heat Exchanger 52 Cryocoil (main cooler)
80a First branch capillary tube (expander)
81a Second branch capillary tube (expander)

Claims (11)

A first component comprising 1,1,1,3,3-pentafluoropropane;
A second component comprising 1,1-difluoroethane;
A third component comprising hexafluoroethane, and
A refrigerant composition containing a fourth component made of perfluoromethane. The refrigerant composition according to claim 1,
The content of the first component is set to 5 to 40% by mole percentage,
The content of the second component is set to 5 to 35% by mole percentage,
The content of the third component is set to 5 to 40% by mole percentage,
The content of the fourth component is a refrigerant composition set in a molar percentage of 10 to 45%. In the refrigerant composition according to claim 1 or 2,
A refrigerant composition further comprising a fifth component made of krypton. In the refrigerant composition according to claim 3,
The content of the fifth component is a refrigerant composition that is set at a molar percentage exceeding 0 and not exceeding 40%. In the refrigerant composition according to any one of claims 1 to 4,
A refrigerant composition further comprising a first additive comprising at least one of trifluoromethane and ethane. The refrigerant composition according to claim 5,
The content of the first additive is a refrigerant composition that is set to be more than 0 and 20% or less in terms of mole percentage. In the refrigerant composition according to any one of claims 1 to 6,
A refrigerant composition further comprising a second additive consisting essentially of methane. The refrigerant composition according to claim 7,
The content of the second additive is a refrigerant composition that is set to be more than 0 and 10% or less in terms of mole percentage. In the refrigerant composition according to any one of claims 1 to 8,
A refrigerant composition further comprising a sixth component consisting of at least one of helium, neon, argon, and nitrogen. The refrigerant composition according to claim 9,
The content of the sixth component is a refrigerant composition that is set to be more than 0 and 20% or less in terms of mole percentage. A refrigerant apparatus comprising a refrigerant circuit in which the refrigerant composition according to any one of claims 1 to 10 circulates as a mixed refrigerant,
The refrigerant circuit is
A compressor for compressing the mixed refrigerant;
Among the compressed mixed refrigerant, a condenser that cools and liquefies a relatively high boiling point refrigerant,
A multi-stage gas-liquid separator that sequentially separates the liquefied mixed refrigerant from a relatively high boiling point refrigerant into a low boiling point refrigerant into a liquid refrigerant and a gas refrigerant,
A plurality of stages in which the primary-side gas refrigerant separated by each gas-liquid separator is cooled by heat exchange with the secondary-side liquid refrigerant separated and decompressed by each gas-liquid separator. Cascade heat exchanger,
An expander that depressurizes a relatively low boiling point refrigerant that has flowed out from the primary side of the cascade heat exchanger at the final stage of the plurality of stages; and
A refrigerating apparatus in which a main cooler for evaporating the decompressed refrigerant is connected to each other by a refrigerant pipe to constitute a refrigeration cycle.

Images