Patent Grant
11939515
The present disclosure relates to a composition comprising a refrigerant, a heat transfer medium, and a heat cycle system.
Fluorinated hydrocarbons free of chlorine in their molecular structure, such as difluoromethane (CH2F2), R32, boiling point: −52° C.), pentafluoroethane (CF3CHF2, R125, boiling point: −48° C.), 1,1,1-trifluoroethane (CF3CH3, R143a, boiling point: −47° C.), 1,1,1,2-tetrafluoroethane (CF3CH2F, R134a, boiling point: −26° C.), 1,1-difluoroethane (CHF2CH3, R152a, boiling point: −24° C.), and 2,3,3,3-tetrafluoropropene (CF3CF═CH2, 1234yf, boiling point: −29° C.), have been used in refrigerants for air conditioners, refrigerating machines, refrigerators, and other similar equipment.
Of these fluorinated hydrocarbons, there have been proposed, for example, a three-component mixed refrigerant consisting of R32, R125, and R134a in respective amounts of 23, 25, and 52 wt % (R407C); and a three-component mixed refrigerant consisting of R125, 143a, and R134a in respective amounts of 44, 52, and 4 wt % (R404A). For example, Patent Literature 1 and Patent Literature 2 disclose using R404A as a refrigerant for freezing and refrigeration.
However, R404A is known to have a very high global warming potential (GWP) of 3922, which is higher than that of CHClF2 (R22, GWP=1810),a chlorine-containing fluorinated hydrocarbon. Thus, there is demand for the development of an alternative refrigerant with a reduced GWP for R404A. For example, Patent Literature 3 and Patent Literature 4 disclose a refrigerant composition comprising difluoromethane (R32), pentafluoroethane (R125), 2,3,3,3-tetrafluoropropene (1234yf), and 1,1,1,2-tetrafluoroethane (R134a) as an alternative refrigerant for R404A.
R410A (GWP=2088), as well as R404A, is also known. As an alternative refrigerant therefor, R454B with a reduced GWP (designated as trade name “DR-5A” in Patent Literature 5; 68.9 wt % R32/31.1 wt % R1234yf, GWP: 466, 102% COP (relative to R410A), 97% Cap. (relative to R410A)) has been proposed in Patent Literature 5. However, even in R454B, a GWP of 466 is the limit.
PTL 1: JPH09-324175A
PTL 2: U.S. Pat. No. 8,168,077
PTL 3: WO2010/059677
PTL 4: WO2011/163117
PTL 5: WO2016/075541
An object of the present disclosure is to provide a refrigerant composition (mixed refrigerant) that can serve as an alternative refrigerant for R404A and/or R410A, the refrigerant composition having three types of performance; i.e., a coefficient of performance (COP) and a refrigerating capacity (cooling capacity, capacity (Cap)) that are equivalent to or higher than those of R404A and/or R410A, and a sufficiently low GWP.
1. A composition comprising a refrigerant, the refrigerant comprising difluoromethane (HFC-32), 2,3,3,3-tetrafluoropropene (HFO-1234yf), and at least one of 1,1-difluoroethylene (HFO-1132a) and tetrafluoroethylene (FO-1114).
2. The composition according to Item 1, wherein the refrigerant comprises HFO-1132a.
3. The composition according to Item 2, wherein the refrigerant comprises HFC-32 in an amount of 15.0 to 24.0 mass % and HFO-1132a in an amount of 1.0 to 7.0 mass %, based on the total amount of HFC-32, HFO-1234yf, and HFO-1132a taken as 100 mass %.
4. The composition according to Item 2, wherein the refrigerant comprises HFC-32 in an amount of 19.5 to 23.5 mass % and HFO-1132a in an amount of 3.1 to 3.7 mass %, based on the total amount of HFC-32, HFO-1234yf, and HFO-1132a taken as 100 mass %.
5. The composition according to Item 1, wherein
the refrigerant comprises HFC-32, HFO-1234yf, and HFO-1132a, and
when the mass % of HFC-32, HFO-1132a, and HFO-1234yf based on their sum in the refrigerant is respectively represented by x, y, and z, coordinates (x, y, z) in a ternary composition diagram in which the sum of HFC-32, HFO-1132a, and HFO-1234yf is 100 mass % are within the range of a triangular region surrounded by line segments RS, ST, and TR that connect the following 3 points:
point R (21.80, 3.95, 74.25),
point S (21.80, 3.05, 75.15), and
point T (20.95, 75.30, 3.75),
or on the line segments.
6. The composition according to any one of Items 1 to 5, for use as an alternative refrigerant for R404A.
7. The composition according to Item 1,
wherein
point L (74.0, 19.9, 6.1),
point F (49.1, 25.9, 25.0),
point G (0.0, 48.6, 51.4),
point O (0.0, 0.0, 100), and
point B (73.9, 0.0, 26.1),
or on the line segments (excluding the line segments GO and OB) ,
8. The composition according to Item 1,
wherein
point P (59.1, 23.2, 17.7),
point F (49.1, 25.9, 25.0),
point G (0.0, 48.6, 51.4),
point O (0.0, 0.0, 100), and
point B′ (59.0, 0.0, 40.2),
or on the line segments (excluding the line segments GO and OB′ ),
9. The composition according to Item 1,
wherein
point M (74.0, 19.5, 6.5),
point I (62.9, 15.5, 21.6),
point J (33.5, 0.0, 66.5), and
point B (73.9, 0.0, 26.1),
or on the line segments (excluding the line segment JB),
10. The composition according to Item 1,
wherein
point Q (59.1, 12.7, 28.2),
point J (33.5, 0.0, 66.5), and
point B′ (59.0, 0.0, 40.2),
or on the line segments (excluding the line segment JB′),
11. The composition according to Item 1,
wherein
point Q (59.1, 12.7, 28.2),
point U (59.0, 5.5, 35.5), and
point V (52.5, 8.4, 39.1),
or on the line segments,
12. The composition according to any one of Items 7 to 11, for use as an alternative refrigerant for R410A.
13. The composition according to any one of Items 1 to 5, for use as an alternative refrigerant for R12, R134a, R407A, R407C, R407F, R407H, R410A, R413A, R417A, R422A, R422B, R422C, R422D, R423A, R424A, R426A, R427A, R430A, R434A, R437A, R438A, R448A, R449A, R449B, R449C, R452A, R452B, R454A, R454B, R454C, R455A, R459A, R465A, R502, R507, or R513A.
14. The composition according to any one of Items 7 to 11, for use as an alternative refrigerant for R12, R134a, R404A, R407A, R407C, R407F, R407H, R413A, R417A, R422A, R422B, R422C, R422D, R423A, R424A, R426A, R427A, R430A, R434A, R437A, R438A, R448A, R449A, R449B, R449C, R452A, R452B, R454A, R454B, R454C, R455A, R459A, R465A, R502, R507, or R513A.
15. The composition according to any one of Items 1 to 14, for use as a working fluid for a refrigerating machine, wherein the composition further comprises a refrigeration oil.
16. A refrigerating machine comprising the composition according to any one of Items 1 to 14 as a working fluid.
17. A heat transfer medium comprising the composition according to any one of Items 1 to 14.
18. A heat cycle system using the heat transfer medium according to Item 17.
19. A composition comprising a refrigerant, the refrigerant comprising 1,1-difluoroethylene (HFO-1132a), the composition being for use as an alternative refrigerant for R12, R22, R134a, R404A, R407A, R407C, R407F, R407H, R410A, R413A, R417A, R422A, R422B, R422C, B422D, R423A, R424A, R426A, R427A, R430A, R434A, R437A, R438A, R448A, R449A, R449B, R449C, R452A, R452B, R454A, R454B, R454C, R455A, R459A, R465A, R502, R507, or R513A.
The refrigerant (mixed refrigerant) according to the present disclosure has three types of performance; i.e., a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R404A and/or R410A, and a sufficiently low GWP.
The present inventors conducted extensive research to solve the above problem, and consequently found that a refrigerant (mixed refrigerant) comprising difluoromethane (HFC-32), 2,3,3,3-tetrafluoropropene (HFO-1234yf), and at least one of 1,1-difluoroethylene (HFO-1132a) and tetrafluoroethylene (FO-1114) has the performance described above.
The present disclosure has been completed as a result of further research based on this finding. The present disclosure includes the following embodiments.
In the present specification, the term “refrigerant” includes at least compounds that are specified in ISO 817 (International Organization for Standardization), and that are given a refrigerant number (ASHRAE number) representing the type of refrigerant with “R” at the beginning; and further includes refrigerants that have properties equivalent to those of such refrigerants, even though a refrigerant number is not yet given.
Refrigerants are broadly divided into fluorocarbon compounds and non-fluorocarbon compounds in terms of the structure of the compounds. Fluorocarbon compounds include chlorofluorocarbons (CFC), hydrochlorofluorocarbons (HCFC), and hydrofluorocarbons (HFC). Non-fluorocarbon compounds include propane (R290), propylene (R1270), butane (R600), isobutane (R600a), carbon dioxide (R744), ammonia (R717), and the like.
In the present specification, the phrase “composition comprising a refrigerant” at least includes (1) a refrigerant itself (including a mixture of refrigerants); (2) a composition that further comprises other components, and that can be mixed with at least a refrigeration oil to obtain a working fluid for a refrigerating machine; and (3) a working fluid for a refrigerating machine containing a refrigeration oil.
In the present specification, of these three embodiments, the composition (2) is referred to as a “refrigerant composition” so as to distinguish it from a refrigerant itself (including a mixture of refrigerants). Further, the working fluid for a refrigerating machine (3) is referred to as a “refrigeration oil-containing working fluid” so as to distinguish it from the “refrigerant composition.”
In the present specification, when the term “alternative” is used in a context in which the first refrigerant is replaced with the second refrigerant, the first type of “alternative” means that equipment designed for operation using the first refrigerant can be operated using the second refrigerant under optimum conditions, optionally with changes of only a few parts (at least one of the following: refrigeration oil, gasket, packing, expansion valve, dryer, and other parts) and equipment adjustment. In other words, this type of alternative means that the same equipment is operated with an alternative refrigerant. Embodiments of this type of “alternative” include “drop-in alternative,” “nearly drop-in alternative,” and “retrofit,” in the order in which the extent of changes and adjustment necessary for replacing the first refrigerant with the second refrigerant is smaller.
The term “alternative” also includes a second type of “alternative,” which means that equipment designed for operation using the second refrigerant is operated for the same use as the existing use with the first refrigerant by using the second refrigerant. This type of alternative means that the same use is achieved with an alternative refrigerant.
In the present specification, the term “refrigerating machine” refers to machines in general that draw heat from an object or space to make the temperature thereof lower than the temperature of ambient air, and maintain a low temperature. In other words, refrigerating machines refer to conversion machines that gain energy from the outside to do work; and that perform energy conversion, in order to transfer heat from where the temperature is lower to where the temperature is higher.
In the present specification, the term “temperature glide” can be rephrased as an absolute value of the difference between the starting temperature and the ending temperature of the phase change process of the composition comprising a refrigerant according to the present disclosure within the constituent elements of a heat cycle system.
The refrigerant according to the present disclosure comprises difluoromethane (HFC-32), 2,3,3,3-tetrafluoropropene (HFO-1234yf), and at least one of 1,1-difluoroethylene (HFO-1132a) and tetrafluoroethylene (FO-1114). The refrigerant according to the present disclosure, which has the above feature, has three types of performance; i.e., a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R404A and/or R410A, and a sufficiently low GWP.
In the present disclosure, a coefficient of performance (COP) that is equivalent to or higher than that of R404A means that the COP ratio relative to R404A is 100% or more (preferably 103% or more, and more preferably 105% or more). A refrigerating capacity (Cap) that is equivalent to or higher than that of R404A means that the Cap ratio relative to R404A is 80% or more (preferably 90% or more, more preferably 95% or more, and most preferably 100% or more).
A coefficient of performance (COP) that is equivalent to or higher than that of R410A means that the COP ratio relative to R410A is 90% or more (preferably 93% or more, more preferably 95% or more, and most preferably 100% or more). A refrigerating capacity (Cap) that is equivalent to or higher than that of R410A means that the Cap ratio relative to R410A is 80% or more (preferably 95% or more, more preferably 99% or more, most preferably 100% or more).
Further, a sufficiently low GWP means that the GWP is 500 or less, preferably 400 or less, and more preferably 300 or less. In a refrigerant of a first embodiment described later, a sufficiently low GWP means that the GWP is 200 or less, preferably 170 or less, more preferably 150 or less, and even more preferably 130 or less.
The refrigerant according to the present disclosure comprises HFC-32, HFO-1234yf, and at least one of HFO-1132a and FO-1114. The composition of the refrigerant is not limited, as long as the performance described above is exhibited. In particular, the refrigerant preferably has a composition in which the GWP of the refrigerant is 500 or less (in particular, the GWP is 170 or less in the refrigerant of the first embodiment described later). Regarding at least one of HFO-1132a and FO-1114, the refrigerant may comprise either HFO-1132a or FO-1114, or both. In the present disclosure, the refrigerant preferably comprises HFO-1132a.
Specifically, the refrigerant according to the present disclosure preferably comprises HFC-32, HFO-1234yf, and HFO-1132a, and is preferably a mixed refrigerant comprising HFO-1234yf, HFC-32 in an amount of 15.0 to 24.0 mass %, and HFO-113a in an amount of 1.0 to 7.0 mass, based on the total amount of these three components taken as 100 mass % (the refrigerant of the first embodiment; within the range of a quadrangular region indicated by X, or on the line segments of the quadrangular region in the enlarged view of
The refrigerant (the refrigerant of the first embodiment) according to the present disclosure preferably has a condensation temperature glide of 12° C. or less, more preferably 10° C. or less, and even more preferably 9° C. or less. Moreover, the compressor outlet pressure is preferably within the range of 1.60 to 2.00 MPa, and more preferably 1.73 to 1.91 MPa. The refrigerant according to the present disclosure has a characteristic such that it has good miscibility with a known refrigeration oil described later, when mixed with the refrigeration oil.
The refrigerant of the first embodiment encompasses a refrigerant of a second embodiment within its compositional range.
The refrigerant (the refrigerant of the second embodiment) according to the present disclosure comprises HFC-32, HFO-1234yf, and HFO-1132a,
wherein
point R (21.80, 3.95, 74.25),
point S (21.80, 3.05, 75.15), and
point T (20.95, 75.30, 3.75),
or on the line segments (within the triangular region surrounded by the line segments RS, ST, and TR; or on the line segments in the enlarged view of
When the requirements above are satisfied, the refrigerant (the refrigerant of the second embodiment) according to the present disclosure has a coefficient of performance (COP) that is equivalent to or higher than that of R404A, a refrigerating capacity (Cap) of 95% or more, a GWP of 150 or less, and a condensation temperature glide of 9° C. or less.
The refrigerant according to the present disclosure encompasses refrigerants of the following third to seventh embodiments, in addition to the refrigerants of the first embodiment and the second embodiment. The refrigerants of the third to seventh embodiments are particularly useful as alternative refrigerants for R410A.
The refrigerant (the refrigerant of the third embodiment) according to the present disclosure comprises HFC-32, HFO-1234yf, and HFO-1132a,
wherein
point L (74.0, 19.9, 6.1),
point F (49.1, 25.9, 25.0),
point G (0.0, 48.6, 51.4),
point O (0.0, 0.0, 100), and
point B (73.9, 0.0, 26.1),
or on the line segments (excluding the line segments GO and OB),
When the requirements above are satisfied, the refrigerant (the refrigerant of the third embodiment) according to the present disclosure has a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R410A, a GWP of 500 or less, and a compressor outlet pressure that is less than or equal to 1.25 times that of R410A. The compressor outlet pressure is preferably 3.4 MPa or less, and more preferably 3.0 MPa or less.
For line segment EF (including the line segment LF and line segment PF), an approximate curve was determined from three points; i.e., the point E in a table and
The refrigerant (the refrigerant of the fourth embodiment) according to the present disclosure comprises HFC-32, HFO-1234yf, and HFO-1132a,
wherein
point P (59.1, 23.2, 17.7),
point F (49.1, 25.9, 25.0),
point G (0.0, 48.6, 51.4),
point O (0.0, 0.0, 100), and
point B′ (59.0, 0.0, 40.2),
or on the line segments (excluding the line segments GO and OB′ ),
When the requirements above are satisfied, the refrigerant (the refrigerant of the fourth embodiment) according to the present disclosure has a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R410A, a GWP of 400 or less, and a compressor outlet pressure that is less than or equal to 1.25 times that of R410A. The compressor outlet pressure is preferably 3.4 MPa or less, and more preferably 3.0 MPa or less.
The refrigerant (the refrigerant of the fifth embodiment) according to the present disclosure comprises HFC-32, HFO-1234yf, and HFO-1132a,
wherein
point M (74.0, 19.5, 6.5),
point I (62.9, 15.5, 21.6),
point J (33.5, 0.0, 66.5), and
point B (73.9, 0.0, 26.1),
or on the line segments (excluding the line segment JB),
When the requirements above are satisfied, the refrigerant (the refrigerant of the fifth embodiment) according to the present disclosure has a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R410A, a GWP of 500 or less, and a compressor outlet pressure that is less than or equal to 1.25 times that of R410A. The compressor outlet pressure is preferably 3.4 MPa or less, and more preferably 3.0 MPa or less. Moreover, the refrigerant (the refrigerant of the fifth embodiment) according to the present disclosure has a condensation temperature glide and an evaporating temperature glide that are both as small as 5° C. or less, and is particularly suitable as an alternative for R410A.
For line segment HI (including the line segment MI), an approximate curve was determined from three points; i.e., the point H in a table and
The refrigerant (the refrigerant of the sixth embodiment) according to the present disclosure comprises HFC-32, HFO-1234yf, and HFO-1132a,
wherein
point Q (59.1, 12.7, 28.2),
point J (33.5, 0.0, 66.5), and
point B′ (59.0, 0.0, 40.2),
or on the line segments (excluding the line segment JB′ ),
When the requirements above are satisfied, the refrigerant (the refrigerant of the sixth embodiment) according to the present disclosure has a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R410A, a GWP of 400 or less, and a compressor outlet pressure that is less than or equal to 1.25 times that of R410A. The compressor outlet pressure is preferably 3.4 MPa or less, and more preferably 3.0 MPa or less. Moreover, the refrigerant (the refrigerant of the sixth embodiment) according to the present disclosure has a small evaporating temperature glide of 5° C. or less, preferably 4° C. or less, and more preferably 3.5° C. or less; and is particularly suitable as an alternative for R410A.
The refrigerant (the refrigerant of the seventh embodiment) according to the present disclosure comprises HFC-32, HFO-1234yf, and HFO-1132a,
wherein
point Q (59.1, 12.7, 28.2),
point U (59.0, 5.5, 35.5), and
point V (52.5, 8.4, 39.1),
or on the line segments,
When the requirements above are satisfied, the refrigerant (the refrigerant of the seventh embodiment) according to the present disclosure has a coefficient of performance (COP) and a refrigerating capacity (Cap) (a refrigerating capacity of 99% or more relative to that of R410A) that are equivalent to or higher than those of R410A, a GWP of 400 or less, and a compressor outlet pressure that is less than or equal to 1.25 times that of R410A. The compressor outlet pressure is preferably 3.4 MPa or less, and more preferably 3.0 MPa or less. Moreover, the refrigerant (the refrigerant of the seventh embodiment) according to the present disclosure has a small evaporating temperature glide of 5° C. or less, preferably 4° C. or less, and more preferably 3.5° C. or less; and is particularly suitable as an alternative for R410A.
For the line segment UV, an approximate curve was determined from three points; i.e., the point U in a table and
As exemplified by the refrigerants of the first to seventh embodiments, alternative refrigerants for a conventional refrigerant such as R12, R22, R134a, R404A, R407A, R407C, R407F, R407H, R410A, R413A, R417A, R422A, R422B, R422C, R422D, R423A, R424A, R426A, R427A, R430A, R434A, R437A, R438A, R448A, R449A, R449B, R449C, R452A, R452B, R454A, R454B, R454C, R455A, R459A, R465A, R502, R507, or R513A, the alternative refrigerants comprising HFO-1132a, are proposed for the first time in the present disclosure. The present disclosure encompasses in its broadest sense an invention directed to “a composition comprising a refrigerant, the refrigerant comprising 1,1-difluoroethylene (HFO-1132a), the composition being for use as an alternative refrigerant for R12, R22, R134a, R404A, R407A, R407C, R407F, R407H, R410A, R413A, R417A, R422A, R422B, R422C, R422D, R423A, R424A, R426A, R427A, R430A, R434A, R437A, R438A, R448A, R449A, R449B, R449C, R452A, R452B, R454A, R454B, R454C, R455A, R459A, R465A, R502, R507, or R513A.” In particular, the present disclosure encompasses an invention directed to “a composition comprising a refrigerant, the refrigerant comprising 1,1-difluoroethylene (HFO-1132a), the composition being for use as an alternative refrigerant for R410A” as a preferable one.
The refrigerant according to the present disclosure may be a mixed refrigerant further comprising one or more other additional refrigerants in addition to HFC-32, HFO-1234yf, and at least one of HFO-1132a and FO-1114, as long as the above characteristics and effects are not impaired. In this case, the total amount of HFC-32, HFO-1234yf, and at least one of HFO-1132a and FO-1114 is preferably 99.5 mass % or more and less than 100 mass %, more preferably 99.75 mass % or more and less than 100 mass %, and even more preferably 99.9 mass % or more and less than 100 mass %, based on the entire refrigerant according to the present disclosure.
The additional refrigerants are not limited, and can be selected from a wide range of known refrigerants widely used in the field. The mixed refrigerant may comprise a single additional refrigerant, or two or more additional refrigerants.
The refrigerant according to the present disclosure can be preferably used as a working fluid in a refrigerating machine.
The composition comprising a refrigerant according to the present disclosure is suitable for use as an alternative refrigerant for a conventional refrigerant such as R12, R22, R134a, R404A, R407A, R407C, R407F, R407H, R410A, R413A, R417A, R422A, R422B, R422C, R422D, R423A, R424A, R426A, R427A, R430A, R434A, R437A, R438A, R448A, R449A, R449B, R449C, R452A, R452B, R454A, R454B, R454C, R455A, R459A, R465A, R502, R507, or R513A.
In particular, the composition comprising the refrigerant (in particular, the refrigerant of the first embodiment or the refrigerant of the second embodiment) according to the present disclosure is particularly suitable for use as an alternative refrigerant for R404A. As alternative refrigerants with a reduced GWP for R404A, a refrigerant containing R32 and R1234yf in respective amounts of 21.5% and 78.5% (R454C); a refrigerant containing R32, R1234yf, and R152a in respective amounts of 18%, 70%, and 12% (R457A); and like refrigerants are conventionally known. The refrigerants according to the present disclosure (in particular, the refrigerants of the first embodiment and the second embodiment) are superior in refrigerating capacity to these conventional alternative refrigerants for R404A.
The composition comprising the refrigerant according to the present disclosure (in particular, the third to seventh embodiments) is particularly suitable for use as an alternative refrigerant for R410A. In particular, the refrigerant of the fifth embodiment is suitable as an alternative refrigerant for R410A in terms of a condensation temperature glide and an evaporating temperature glide that are both as small as 5° C. or less in addition to the COP, Cap, and GWP. The refrigerants of the sixth embodiment and the seventh embodiment are suitable as alternative refrigerants for R410A in terms of a small evaporating temperature glide of 5° C. or less, in addition to the COP, Cap, and GWP.
The refrigerant composition according to the present disclosure comprises at least the refrigerant according to the present disclosure, and can be used for the same use as the refrigerant according to the present disclosure.
Moreover, the refrigerant composition according to the present disclosure can be further mixed with at least a refrigeration oil, to thereby obtain a working fluid for a refrigerating machine.
The refrigerant composition according to the present disclosure further comprises at least one other component in addition to the refrigerant according to the present disclosure. The refrigerant composition according to the present disclosure may comprise at least one of the following other components, if necessary.
As described above, when the refrigerant composition according to the present disclosure is used as a working fluid in a refrigerating machine, it is generally used as a mixture with at least a refrigeration oil.
Therefore, it is preferable that the refrigerant composition according to the present disclosure does not substantially comprise a refrigeration oil. Specifically, in the refrigerant composition according to the present disclosure, the content of the refrigeration oil based on the entire refrigerant composition is preferably 0 to 1 mass %, more preferably 0 to 0.5 mass %, even more preferably 0 to 0.25 mass %, and particularly preferably 0 to 0.1 mass %.
The refrigerant composition according to the present disclosure may contain a small amount of water. The water content of the refrigerant composition is preferably 0 to 0.1 mass %, more preferably 0 to 0.075 mass %, even more preferably 0 to 0.05 mass %, and particularly preferably 0 to 0.025 mass % based on the entire refrigerant.
A small amount of water contained in the refrigerant composition stabilizes double bonds in the molecules of unsaturated fluorocarbon compounds that can be present in the refrigerant; and makes it less likely that the unsaturated fluorocarbon compounds will be oxidized, thus increasing the stability of the refrigerant composition. To attain the above effects that are obtained by containing water, the lower limit of the water content is about 0.001 mass %. For example, the water content can be adjusted in the range of 0.001 to 0.1 mass %, 0.001 to 0.075 mass %, 0.001 to 0.05 mass %, and 0.001 to 0.025 mass %.
A tracer is added to the refrigerant composition according to the present disclosure at a detectable concentration such that when the refrigerant composition has been diluted, contaminated, or undergone other changes, the tracer can trace the changes.
The refrigerant composition according to the present disclosure may comprise a single tracer, or two or more tracers.
The tracer is not limited, and can be suitably selected from commonly used tracers. It is preferable that a compound that cannot be an impurity inevitably mixed into the refrigerant according to the present disclosure is selected as the tracer.
Examples of tracers include hydrofluorocarbons, hydrochlorofluorocarbons, chlorofluorocarbons, hydrochlorocarbons, fluorocarbons, deuterated hydrocarbons, deuterated hydrofluorocarbons, perfluorocarbons, fluoroethers, brominated compounds, iodinated compounds, alcohols, aldehydes, ketones, nitrous oxide (N2O), and the like. Of these, hydrofluorocarbons, hydrochlorofluorocarbons, chlorofluorocarbons, hydrochlorocarbons, fluorocarbons, and fluoroethers are preferable.
Specifically, the following compounds (also referred to below as “tracer compounds”) are more preferable as tracers.
The tracer compound can be present in the refrigerant composition at a total concentration of 10 parts per million by weight (ppm) to 1000 ppm. The tracer compound is preferably present in the refrigerant composition at a total concentration of 30 ppm to 500 ppm, more preferably 50 ppm to 300 ppm, even more preferably 75 ppm to 250 ppm, and particularly preferably 100 ppm to 200 ppm.
The refrigerant composition according to the present disclosure may comprise a single ultraviolet fluorescent dye, or two or more ultraviolet fluorescent dyes.
The ultraviolet fluorescent dye is not limited, and can be suitably selected from commonly used ultraviolet fluorescent dyes.
Examples of ultraviolet fluorescent dyes include naphthalimide, coumarin, anthracene, phenanthrene, xanthene, thioxanthene, naphthoxanthene, fluorescein, and derivatives thereof. Of these, naphthalimide and coumarin are preferable.
The refrigerant composition according to the present disclosure may comprise a single stabilizer, or two or more stabilizers.
The stabilizer is not limited, and can be suitably selected from commonly used stabilizers.
Examples of stabilizers include nitro compounds, ethers, amines, and the like.
Examples of nitro compounds include aliphatic nitro compounds, such as nitromethane and nitroethane; aromatic nitro compounds, such as nitro benzene and nitro styrene; and the like.
Examples of ethers include 1,4-dioxane and the like.
Examples of amines include 2,2,3,3,3-pentafluoropropylamine, diphenylamine, and the like.
Examples of stabilizers also include butylhydroxyxylene, benzotriazole, and the like in addition to the nitro compounds, ethers, and amines.
The content of the stabilizer is not limited. The content of the stabilizer is generally 0.01 to 5 mass %, preferably 0.05 to 3 mass %, more preferably 0.1 to 2 mass %, even more preferably 0.25 to 1.5 mass %, and particularly preferably 0.5 to 1 mass %, based on the entire refrigerant.
The stability of the refrigerant composition according to the present disclosure can be evaluated by a commonly used method, without limitation. Examples of such methods include an evaluation method using the amount of free fluorine ions as an index according to ASHRAE Standard 97-2007, and the like. There is, for example, another evaluation method using the total acid number as an index. This method can be performed, for example, according to ASTM D 974-06.
The refrigerant composition according to the present disclosure may comprise a single polymerization inhibitor, or two or more polymerization inhibitors.
The polymerization inhibitor is not limited, and can be suitably selected from commonly used polymerization inhibitors. Examples of polymerization inhibitors include 4-methoxy-1-naphthol, hydroquinone, hydroquinone methyl ether, dimethyl-t-butylphenol, 2, 6-di-tert-butyl-p-cresol, benzotriazole, and the like.
The content of the polymerization inhibitor is not limited. The content of the polymerization inhibitor is generally 0.01 to 5 mass %, preferably 0.05 to 3 mass %, more preferably 0.1 to 2 mass %, even more preferably 0.25 to 1.5 mass %, and particularly preferably 0.5 to 1 mass %, based on the entire refrigerant.
The refrigeration oil-containing working fluid according to the present disclosure comprises at least the refrigerant or refrigerant composition according to the present disclosure and a refrigeration oil, for use as a working fluid in a refrigerating machine. Specifically, the refrigeration oil-containing working fluid according to the present disclosure is obtained by mixing a refrigeration oil used in a compressor of a refrigerating machine with the refrigerant or the refrigerant composition.
The content of the refrigeration oil is not limited. The content of the refrigeration oil is generally 10 to 50 mass %, preferably 12.5 to 45 mass %, more preferably 15 to 40 mass %, even more preferably 17.5 to 35 mass %, and particularly preferably 20 to 30 mass %, based on the entire refrigeration oil-containing working fluid.
The refrigeration oil-containing working fluid according to the present disclosure may comprise a single refrigeration oil, or two or more refrigeration oils.
The refrigeration oil is not limited, and can be suitably selected from commonly used refrigeration oils. In this case, refrigeration oils that are superior in the action of increasing the miscibility with the mixture of refrigerants according to the present disclosure (the mixed refrigerant according to the present disclosure) and the stability of the mixed refrigerant according to the present disclosure, for example, can be suitably selected as necessary.
The base oil of the refrigeration oil is preferably, for example, at least one member selected from the group consisting of polyalkylene glycols (PAG), polyol esters (POE), and polyvinyl ethers (PVE).
The refrigeration oil may further contain additives in addition to the base oil.
The additive may be at least one member selected from the group consisting of antioxidants, extreme-pressure agents, acid scavengers, oxygen scavengers, copper deactivators, rust inhibitors, oil agents, and antifoaming agents.
A refrigeration oil with a kinematic viscosity of 5 to 400 cSt at 40° C. is preferable from the standpoint of lubrication.
The refrigeration oil-containing working fluid according to the present disclosure may further optionally contain at least one additive. Examples of additives include the compatibilizing agents described below.
The refrigeration oil-containing working fluid according to the present disclosure may comprise a single compatibilizing agent, or two or more compatibilizing agents.
The compatibilizing agent is not limited, and can be suitably selected from commonly used compatibilizing agents.
Examples of compatibilizing agents include polyoxyalkylene glycol ethers, amides, nitriles, ketones, chlorocarbons, esters, lactones, aryl ethers, fluoroethers, 1,1,1-trifluoroalkanes, and the like, of these, polyoxyalkylene glycol ethers are preferable.
The method for operating a refrigerating machine according to the present disclosure is a method for operating a refrigerating machine using the refrigerant according to the present disclosure.
Specifically, the method for operating a refrigerating machine according to the present disclosure comprises circulating the composition comprising a refrigerant according to the present disclosure as a working fluid in a refrigerating machine.
The heat transfer medium according to the present disclosure comprises the composition containing a refrigerant according to the present disclosure. The heat transfer medium according to the present disclosure can be suitably used for various heat cycle systems. A heat cycle system with high cooling capacity can be obtained by comprising the heat transfer medium according to the present disclosure.
Moreover, since the refrigerant according to the present disclosure has a sufficiently low GWP, a high degree of safety can be imparted to a heat cycle system by comprising the heat transfer medium according to the present disclosure, compared with the case of using an existing refrigerant.
Further, since the heat transfer medium according to the present disclosure has a low temperature glide, a highly stable heat cycle system can be provided.
The type of heat cycle system is not limited. Examples of heat cycle systems include room air conditioners, packaged air conditioners for stores, packaged air conditioners for buildings, packaged air conditioners for facilities, separate air conditioners connected with one or more indoor units and outdoor units through a refrigerant pipe, window air conditioners, portable air conditioners, rooftop or central air conditioners that send cool or warm air through a duct, gas engine heat pumps, air conditioners for trains, air conditioners for automobiles, built-in showcases, separate showcases, refrigerator-freezers for businesses, ice machines, integrated refrigerating machines, vending machines, automobile air conditioners, refrigerating machines for cooling containers or refrigerators such as for marine shipping, turbo refrigerating machines, and apparatuses exclusively used for a heating cycle. Examples of apparatuses exclusively used for a heating cycle include water-heating devices, floor-heating devices, snow-melting devices, and the like.
As long as the heat cycle systems listed above comprise the heat transfer medium according to the present disclosure, the other features of the heat cycle systems are not limited. For example, such a heat cycle system may have a structure similar to that of a known heat cycle system.
The embodiments are described above; however, it will be understood that various changes in forms and details can be made without departing from the spirit and scope of the claims.
The present disclosure is described in more detail below with reference to Examples. However, the present disclosure is not limited to the Examples.
The GWP of the mixed refrigerant shown in each of the Examples and the Comparative Examples, the GWP of R404A (R125/143a/R134a=44/52/4 wt %), and the GWP of R410A (R32/R125=50/50 wt %) were evaluated based on the values in the Intergovernmental Panel on Climate Change (IPCC) fourth report.
Further, the COP and refrigerating capacity of the mixed refrigerant shown in each of the Examples and the Comparative Examples, and the COP and refrigerating capacity of R404A were determined using the National Institute of Science and Technology (NIST), Reference Fluid Thermodynamic and Transport Properties Database (Refprop 9.0). Specifically, the COP and refrigerating capacity in Examples 1 to 16 and Comparative Example 1 (corresponding to the refrigerants of the first embodiment and the second embodiment) were determined by performing theoretical refrigeration cycle calculations for the mixed refrigerants under the following conditions.
Evaporating temperature: −40° C.
Condensation temperature: 40° C.
Superheating temperature: 20K
Subcooling temperature: 0K
Compressor efficiency: 70%
The COP and refrigerating capacity in Examples 17 to 87 and Comparative Examples 2 to 18 (corresponding to the refrigerants of the third to seventh embodiments) were determined by performing theoretical refrigeration cycle calculations for the mixed refrigerants under the following conditions.
Evaporating temperature: 5° C.
Condensation temperature: 45° C.
Superheating temperature: 5K
Subcooling temperature: 5K
Compressor efficiency: 70%
Further, the condensation temperature glide, the evaporating temperature glide, and the compressor outlet pressure when the mixed refrigerant shown in each of the Examples and the Comparative Examples was used were also determined using Refprop 9.0.
Table 1 and Tables 2-1 to 2-12 show the GWP, COP, and refrigerating capacity calculated based on these results. The COP ratio and the refrigerating capacity ratio refer to the ratios (%) relative to R404A in Examples 1 to 16 and Comparative Example 1, and refer to the ratios (8) relative to R410A in Examples 17 to 87 and Comparative Examples 2 to 18.
The coefficient of performance (COP) was calculated according to the following equation.
COP=(refrigerating capacity or heating capacity)/amount of electrical power consumed
As is clear from the results in Table 1, the refrigerant of the second embodiment, in particular, has a coefficient of performance (COP) that is equivalent to or higher than that of R404A, a refrigerating capacity (Cap) of 95% or more, a GWP of 150 or less, and a condensation temperature glide of 9° C. or less; and is particularly excellent as an alternative refrigerant for R404A.
As is clear from the results in Tables 2-1 to 2-12, when the predetermined requirements are satisfied, the refrigerant of the third embodiment has a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R410A, a GWP of 500 or less, and a compressor outlet pressure that is less than or equal to 1.25 times that of R410A; when the predetermined requirements are satisfied, the refrigerant of the fourth embodiment has a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R410A, a GWP of 400 or less, and a compressor outlet pressure that is less than or equal to 1.25 times that of R410A; when the predetermined requirements are satisfied, the refrigerant of the fifth embodiment has a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R410A, a GWP of 500 or less, a compressor outlet pressure that is less than or equal to 1.25 times that of R410A, and a condensation temperature glide and an evaporating temperature glide that are both as small as 5° C. or less; when the predetermined requirements are satisfied, the refrigerant of the sixth embodiment has a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R410A, a GWP of 400 or less, a compressor outlet pressure that is less than or equal to 1.25 times that of R410A, and a small evaporating temperature glide of 5° C. or less; and when the predetermined requirements are satisfied, the refrigerant of the seventh embodiment has a coefficient of performance (COP) and a refrigerating capacity (Cap) (99% or more relative to that of R410A) that are equivalent to or higher than those of R410A, a GWP of 400 or less, a compressor outlet pressure that is less than or equal to 1.25 times that of R410A, and a small evaporating temperature glide of 5° C. or less. All of the refrigerants of the third to seventh embodiments are suitable as alternative refrigerants for R410A. In particular, the refrigerant of the fifth embodiment or the sixth embodiment, both of which have a small condensation temperature glide and/or a small evaporating temperature glide, is particularly suitable as an alternative refrigerant for R410A. Furthermore, the refrigerant of the seventh embodiment, which has a small condensation temperature glide and/or a small evaporating temperature glide, and a coefficient of performance (COP) and a refrigerating capacity (Cap) (99% or more relative to that of R410A) that are equivalent to or higher than those of R410A, is further excellent as an alternative refrigerant for R410A.
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| Filing Document | Filing Date | Country | Kind |
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| PCT/JP2019/027031 | 7/8/2019 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2020/017386 | 1/23/2020 | WO | A |
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