A novel refrigerant composition useful as a substitute for HCFC-22, comprising a first constituent of difluoromethane (CH2F2, HFC-32); a second constituent of pentafluoroethane (CHF2CF3, HFC-125); a third constituent of 1,1,1-trifluoroethane (CH3CF3, HFC-143a); a fourth constituent selected from the group consisting of cyclopropane (C3H6, RC-270), 1,1,1,2,3,3,3-heptafluoropropane (CF3CHFCF3, HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245cb), isobutane (CH(CH3)2CH3, R-600a), octafluorocyclobutane (C4F8, RC-318), 1,1,1,2,3,3-hexafluoropropane (CHF2CHFCF3, HFC-236ea), butane (C4H10, R-600), bis(difluoromethyl)ether (CHF2OCHF2, HFE-134) and pentafluoroethylmethylether (CF3CF2OCH3, HFE-245).

Description

14 parts

›BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a refrigerant mixture which is useful as a substitute for chlorodifluoromethane (CHCIF 2 , HCFC-22). More particularly, the present invention relates to a refrigerant composition which is useful as a substitute for HCFC-22, which comprises a first constituent of difluoromethane (CH 2 F 2 , HFC-32); a second constituent of pentafluoroethane (CHF 2 CF 3 , HFC-125); a third constituent of 1,1,1-trifluoroethane (CH 3 CF 3 , HFC-143a); a fourth constituent selected from the group consisting of cyclopropane (C 3 H 6 , RC-270), 1,1,1,2,3,3,3-heptafluoropropane (CF 3 CHFCF 3 , HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH 3 CF 2 CF 3 , HFC-245cb), isobutane (CH(CH 3 ) 2 CH 3 , R-600a), octafluorocyclobutane (C 4 F 8 , RC-318), 1,1,1,2,3,3-hexafluoropropane (CHF 2 CHFCF 3 , HFC-236ea), butane (C 4 H 10 , R-600), bis(difluoromethyl)ether (CHF 2 OCHF 2 , HFE-134) and pentafluoroethylmethylether (CF 3 CF 2 OCH 3 , HFE-245).

2. Description of the Background Art

As is well known, CFC compounds have been restricted in production and use in accordance with the Montreal Protocol because they have been found as a main factor in contributing to the destruction of the ozone layer. In advanced nations, the use of such CFC compounds has already been banned since 1996. It is also known that HCFC-based compounds such as HCFC-22 have considerable effects in causing damage to the ozone layer even though this effect is less severe than those of the CFC compounds. For this reason, a restriction has been made to gradually reduce the use of such HCFC-based compounds. A plan has also been made to ban the use of HCFC-based compounds about the year 2020.

This has resulted in a number of world-wide research efforts to produce substitute materials coping with the restriction in use of HCFC-22 which will be more severe in the future. The representative examples of a substitute refrigerant mixtures are HFC-407C and HFC-410A proposed by the American Society of Heating. Refrigerating and Air-Conditioning Engineers (ASHRAE). HFC-407C is a refrigerant mixture of HFC-32/125/134a in a ratio of 23/25/52 (based on weight percent). Meanwhile, HFC-410A is a refrigerant mixture of HFC-32/125 in a ratio of 50/50 (based on weight percent).

In addition, U.S. Pat. No. 5,080,823 discloses a mixed refrigerant composition of HFC-143a/opropane (C 3 H 8 ), U.S. Pat. No. 5,185,094: HFC-32/125/134a, U.S. Pat. No. 5,211,867: HFC-125/143a, U.S. Pat. No. 5,234,613: HFC-32/propane, U.S. Pat. No. 5,236,611: PFC-218/ HFC-143a, U.S. Pat. No. 5,290,466: HFC-32/134a/134, U.S. Pat. No. 5,340,490: HFC-23/CO 2 or HFC-23/116/CO 2 , U.S. Pat. No. 5,403,504: HFC-125/32, U.S. Pat. No. 5,429,760: HFC-23/134a, U.S. Pat. No. 5,538,660: HFC-32/HFC-134a/FC-14 or HFC-32/HFC-134a/PFC-218, and U.S. Pat. No. 5,643,492: HFC-32/125/134a.

Also, Japanese Patent Laid-open Publication No. 172386/1991 discloses a mixed refrigerant composition of HFC-32/125/152, Japanese Patent Laid-open Publication No. 170594/1991: HFC-23/125/134a, Japanese Patent Laid-open Publication No. 170592/1991: HFC-32/143a/152a, Japanese Patent Laid-open Publication No. 170593/1991: HFC-23/125/32, Japanese Patent Laid-open Publication No. 170591/1991: HFC-23/143a/134a, Japanese Patent Laid-open Publication No. 170590/1991: HFC-125/134a/32, Japanese Patent Laid-open Publication No. 170589/1991: HFC-23/143a/152a, Japanese Patent Laid-open Publication No. 170588/1991: HFC-125/143a/134a, Japanese Patent Laid-open Publication No. 170587/1991: HFC-32/134a/152a, Japanese Patent Laid-open Publication No. 170586/1991: HFC-32/143a/134a, Japanese Patent Laid-open Publication No. 170585/1991: HFC-32/125/134a, Japanese Patent Laid-open Publication No. 170584/1991: HFC-23/134a/152a, Japanese Patent Laid-open Publication No. 170583/1991: HFC-125/143a/32, Japanese Patent Laid-open Publication No. 222893/1992: HFC-132/152a, Japanese Patent Laid-open Publication No. 154887/1992: HFC-134/152a , Japanese Patent Laid-open Publication No. 117645/1993: HFC-23/134a/propane, Japanese Patent Laid-open Publication No. 117643/1993: HFC-125/134a/propane, Japanese Patent Laid-open Publication No. 65561/1994: HFC-23/152a/PFC-218, Japanese Patent Laid-Open Publication No. 128872/1994: HFC-32/PFC-218, Japanese Patent Laid-Open Publication No. 220433/1994: HFC-32/125/RC-318, Japanese Patent Laid-Open Publication No. 173462/1995: HFC-143a/125/134a/heptane (C 7 H 16 ), Japanese Patent Laid-open Publication No. 176537/1996: PFC-218/RC-270/HFC-152a, Japanese Patent Laid-open Publication No. 151569/1996: propane/RC-270/HFC-34a, Japanese Patent Laid-open Publication No. 127767/1996: HFC-32/134a/RC-318, Japanese Patent Laid-open Publication No. 25480/1997: HFC-32/134a/125/isobutane, Japanese Patent Laid-open Publication No. 59611/1997: HFC-134a/isobutane, Japanese Patent Laid-Open Publication No. 208941/1997: HFC-32/152a/125/RC-270, and Japanese Patent Laid-open Publication No. 21664/1997: HFC-125/143al134a/RC-270.

Also, Korean Patent Publication No. 93-10514 (Application No. 90-19594) discloses a mixed refrigerant composition of HFC-23/132/152a, HFC-23/125/152a, HFC-32/143a152a, HFC-125/143a/152a, HFC-32/125/125a, HFC-23/143a/152a, or HFC-23/125/152a, Korean Patent Publication No. 93-10515 (Application No. 90-19596): HFC-23/32/134, HFC-23/32/134a, HFC-23/125/134a, HFC-23/125/134, HFC-32/125/134, HFC-23/143a/134a, HFC-32/125/134a, HFC-125/143a/134a, or HFC-125/143a/134, Korean Patent Laid-Open Publication No. 96-4485 (Application No. 95-21221): HFC-32/23/134a, Korean patent Laid-open Publication No. 95-704438 (Application No. 95-701865): HFC-32/125/134a, Korean patent Laid-open Publication No. 96-701168 (Application No. 95-704038): HFC-227ea/HFC-152a, and Korean Patent Laid-open Publication No. 97-704853 (Application No. 97-700436): HFC-134a/HCFC-124/butane.

›SUMMARY OF THE INVENTION

Therefore, an object of the present invention is to provide a novel refrigerant mixture which is useful as a substitute for HCFC-22. That is, the present invention has an object to provide a refrigerant composition produced by mixing additionally one component of RC-270, HFC-227ea, HFC-245cb, R-600a, RC-318, HFC-236ea, R-600, HFE-134 and HFE-245 with a mixture of HFC-32, HFC-125 and HFC-143a, thereby producing a composition capable of exhibiting properties similar to HCFC-22.

›DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS · 1 of 2

The present invention relates to a refrigerant composition which is useful as a substitute for HCFC-22, which comprises a first constituent of difluoromethane (CH 2 F 2 , HFC-32); a second constituent of pentafluoroethane (CHF 2 CF 3 , HFC-125); a third constituent of 1,1,1-trifluoroethane (CH 3 CF 3 , HFC-143a); a fourth constituent selected from the group consisting of cyclopropane (C 3 H 6 , RC-270), 1,1,1,2,3,3,3-heptafluoropropane (CF 3 CHFCF 3 , HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH 3 CF 2 CF 3 , HFC-245cb), isobutane (CH(CH 3 ) 2 CH 3 , R-600a), octafluorocyclobutane (C 4 F 8 , RC-318), 1,1,1,2,3,3-hexafluoropropane (CHF 2 CHFCF 3 , HFC-236ea), butane (C 4 H 10 , R-600), bis(difluoromethyl)ether (CHF 2 OCHF 2 , HFE-134) and pentafluoroethylmethylether (CF 3 CF 2 OCH 3 , HFE-245).

It is preferred that the refrigerant composition of the present invention comprises a first constituent of 15 to 95% by weight difluoromethane (CH 2 F 2 , HFC-32); a second constituent of an amount up to 60% by weight pentafluoroethane (CHF 2 CF 3 , HFC-125); a third constituent of an amount up to 70% by weight 1,1,1-trifluoroethane (CH 3 CF 3 , HFC-143a); a fourth constituent of an amount up to 50% by weight comprising one selected from the group consisting of cyclopropane (C 3 H 6 , RC-270), 1,1,1,2,3,3,3-heptafluoropropane (CF 3 CHFCF 3 , HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH 3 CF 2 CF 3 , HFC-245cb), isobutane (CH(CH 3 ) 2 CH 3 , R-600a), octafluorocyclobutane (C 4 F 8 , RC-318), 1,1,1,2,3,3-hexafluoropropane (CHF 2 CHFCF 3 , HFC-236ea), butane (C 4 H 10 , R-600), bis(difluoromethyl)ether (CHF 2 OCHF 2 , HFE-134) and pentafluoroethylmethylether (CF 3 CF 2 OCH 3 , HFE-245).

In accordance with the present invention, the refrigerant composition as mentioned above is applied to a refrigeration system which comprises a compressor, a condenser, an expansion valve, and an evaporator in order to evaluate the coefficient of performance (COP), the volumetric capacity of refrigereant (VC), and pressures in the compressor and evaporator. The novel refrigerant mixture according to the present invention is evaluated to be substantially equivalent to HFC407C or HFC-410A in terms of performance. Accordingly, the refrigerant mixture of the present invention is useful as a substitute for HCFC-22.

Where the refrigerant composition of the present invention includes HFC-32, HFC-125, HFC-143a and RC-270, the composition comprises 15 to 60% by weight of HFC-32, an amount up to 50% by weight of HFC-125, 20 to 70% by weight of HFC-143a and an amount up to 15% by weight of RC-270, and preferably, the composition comprises 25 to 45% by weight of HFC-32, 2 to 35% is by weight of HFC-125, 28 to 60% by weight of HFC-143a and an amount up to 10% by weight of RC-270.

Where the refrigerant composition of the present invention includes HFC-32, HFC-125, HFC-143a and HFC-227a, the composition comprises 20 to 60% by weight of HFC-32, an amount up to 60% by weight of HFC-125, an amount up to 70% by weight of HFC-143a and an amount up to 50% by weight of HFC-227a, and preferably, the composition comprises 28 to 50% by weight of HFC-32, 2 to 50% by weight of HFC-125, 5 to 60% by weight of HFC-143a and an amount up to 40% by weight of HFC-227ea.

Where the refrigerant composition of the present invention includes HFC-32, HFC-125, HFC-143a and HFC-245cb, the composition comprises 20 to 90% by weight of HFC-32, an amount up to 60% by weight of HFC-125, an amount up to 60% by weight of HFC-143a and an amount up to 50% by weight of HFC-245cb, and preferably, the composition comprises 30 to 85% by weight of HFC-32, 2 to 45% by weight of HFC-125, 3 to 50% by weight of HFC-143a and an amount up to 40% by weight of HFC-245cb.

Where the refrigerant composition of the present invention includes HFC-32, HFC-125, HFC-143a and R-600a, the composition comprises 30-60% by weight of HFC-32, an amount up to 45% by weight of HFC-125, 15 to 50% by weight of HFC-143a and an amount up to 20% by weight of R-600a, and preferably, the composition comprises 38 to 50% by weight of HFC-32, 5 to 35% by weight of HFC-125, 20 to 43% by weight of HFC-143a and an amount up to 15% by weight of R-600a.

Where the refrigerant composition of the present invention includes HFC-32, HFC-125, HFC-143a and RC-318, the composition comprises 20 to 60% by weight of HFC-32, an amount up to 45% by weight of HFC-125, 10 to 50% by weight of HFC-143a and an amount up to 20% by weight of RC-318, and preferably, the composition comprises 30 to 48% by weight of HFC-32, 10 to 35% by weight of HFC-125, 20 to 40% by weight of HFC-143a and an amount up to 15% by weight of RC-318.

Where the refrigerant composition of the present invention includes HFC-32, HFC-125, HFC-143a and HFC-236ea, the composition comprises 20 to 85% by weight of HFC-32, an amount up to 40% by weight of HFC-125, an amount up to 60% by weight of HFC-143a and an amount up to 30% by weight of HFC-236ea, and preferably, the composition comprises 30 to 75% by weight of HFC-32, 5 to 30% by weight of HFC-125, 5 to 48% by weight of HFC-143a and an amount up to 20% by weight of HFC-236ea.

Where the refrigerant composition of the present invention includes HFC-32, HFC-125, HFC-143a and R-600, the composition comprises 25 to 70% by weight of HFC-32, an amount up to 60% by weight of HFC-125, an amount up to 40% by weight of HFC-143a and an amount up to 20% by weight of R-600, and preferably, the composition comprises 35 to 60% by weight of HFC-32, 5 to 50% by weight of HFC-125, 5 to 33% by weight of HFC-143a and an amount up to 12% by weight of R-600.

Where the refrigerant composition of the present invention includes HFC-32, HFC-125, HFC-143a and HFE-134, the composition comprises 30 to 95% by weight of HFC-32, an amount up to 50% by weight of HFC-125, an amount up to 40% by weight of HFC-143a and an amount up to 15% by weight of HFE-134, and preferably, the composition comprises 40 to 88% by weight of HFC-32, 2 to 40% by weight of HFC-125, 2 to 30% by weight of HFC-143a and an amount up to 10% by weight of HFE-134.

›DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS · 2 of 2

Where the refrigerant composition of the present invention includes HFC-32, HFC-125, HFC-143a and HFE-245, the composition comprises 30 to 90% by weight of HFC-32, an amount up to 50% by weight of HFC-125, an amount up to 45% by weight of HFC-143a and an amount up to 15% by weight of HFE-245, and preferably, the composition comprises 40 to 85% by weight of HFC-32, 5 to 40% by weight of HFC-125, 5 to 38% by weight of HFC-143a and an amount up to 10% by weight of HFE-245.

The present invention will now be described in more detail referring to the following examples. It is to be understood that these examples are merely illustrative and it is not intended to limit the scope of the present invention to these examples.

›EXAMPLE

Evaluation of Performance of Refrigerant Composition

In order to evaluate the performance of the refrigerant mixture according to the present invention, a refrigeration system including a compressor, a condenser, an expansion valve, and an evaporator was used which has the following performance evaluation conditions:

Refrigeration capacity: 2 kW

Overall Heat Transfer coefficient in evaporator (UA): 0.20 kW/K

Overall Heat Transfer coefficient in condenser (UA): 0.24 kW/K

Degree of subcooling in condenser: 5° C.

Degree of superheating in evaporator: 5° C.

Efficiency of compressor: 0.8

Temperature of secondary fluid at inlet of condenser: 25° C.

Temperature of secondary fluid at outlet of condenser: 35° C.

Temperature of secondary fluid at inlet of evaporator: 15° C.

Temperature of secondary fluid at outlet of evaporator: 5° C.

Under the above conditions, the refrigerant compositions according to the present invention were compared to HCFC-22, HFC-407C and HFC-410A in terms of the main factors for evaluating the refrigerant performance, that is, the coefficient of performance (COP), the volumetric capacity of refrigerant (VC), and evaporator pressure (P L ), and condenser pressure (P H )

Comparative Examples 1 to 3

HCFC-22, HFC-407C and HFC-410A compared to the refrigerant compositions of the present invention have the following evaluated performances.

Referring to Table 1, it can be seen that HFC-407C exhibits a COP slightly less than that of HCFC-22 while exhibiting a VC and pressures similar to those of HCFC-22. On the other hand, HFC-410A has a COP similar to that of HCFC-22 while exhibiting pressures slightly higher than those of HCFC-22. It should be noted that a composition exhibiting a refrigerant performance defined as above is useful as a substitute refrigerant for HCFC-22. Accordingly, the performances of the refrigerant mixtures according to the present invention were evaluated and compared with the above evaluated results.

›Examples9

›Example 1. Evaluation of Performance of Refrigerant Mixture of HFC-32/HFC-125/HFC-143a/RC-270

The evaluated performances of the refrigerant mixture comprising HFC-32/HFC-125/HFC-143a/RC-270 at different weight percent of each constituents are described in Table 2, respectively. Referring to Table 2, it can be found that the performance of the compositions indicated in each item of Table 2 fall within the range between those of HFC407C and HFC-410A, so that the tested refrigerant mixture is useful as a substitute for HCFC-22.

›Example 2. Evaluation of Performance of Refrigerant Mixture of HFC-32/HFC-125/HFC-143a/HFC-227ea

The evaluated performances of the refrigerant mixture comprising HFC-32/HFC-125/HFC-143a/HFC-227ea at different weight percent of each constituents are described in Table 3, respectively. Referring to Table 3, it can be found that the performance of the compositions indicated in each item of Table 2 fall with ranges between those of HFC407C and HFC-410A, so that the tested refrigerant mixture is useful as a substitute for HCFC-22.

›Example 3. Evaluation of Performance of Refrigerant Mixture of HFC-32/HFC-125/HFC-143a/HFC-245cb

The evaluated performances of the refrigerant mixture comprising HFC-32/HFC-125/HFC-143a/HFC-245cb at different weight percent of each constituents are described in Table 4, respectively. Referring to Table 4, it can be found that the performance of the compositions indicated in each item of Table 2 fall within the ranges between those of HFC407C and HFC-410A, so that the tested refrigerant mixture is useful as a substitute for HCFC-22.

›Example 4. Evaluation of Performance of Refrigerant Mixture of HFC-32/HFC-125/HFC-143a/R-600a

The evaluated performances of the refrigerant mixture comprising HFC-32/HFC-125/HFC-143a/R-600a at different weight percent of each constituents are described in Table 5, respectively. Referring to Table 5, it can be found that the performance of the compositions indicated in each item of Table 2 fall within the ranges between those of HFC407C and HFC-410A, so that the tested refrigerant mixture is useful as a substitute for HCFC-22.

›Example 5. Evaluation of Performance of Refrigerant Mixture of HFC-32/HFC-125/HFC-143a/RC-318

The evaluated performances of the refrigerant mixture comprising HFC-32/HFC-125/HFC-143a/RC-318 at different weight percent of each constituents are described in Table 6, respectively. Referring to Table 6, it can be found that the performance of the compositions indicated in each item of Table 2 fall within the ranges between those of HFC407C and HFC-410A, so that the tested refrigerant mixture is useful as a substitute for HCFC-22.

›Example 6. Evaluation of Performance of Refrigerant Mixture of HFC-32/H FC-125/H FC-143a/HFC-236ea

The evaluated performances of the refrigerant mixture comprising HFC-32/HFC-125/HFC-143a/HFC-236ea at different weight percent of each constituents are described in Table 7, respectively. Referring to Table 7, it can be found that the performance of the compositions indicated in each item of Table 2 fall within the ranges between those of HFC407C and HFC-410A, so that the tested refrigerant mixture is useful as a substitute for HCFC-22.

›Example 7. Evaluation of Performance of Refrigerant Mixture of HFC-32/HFC-125/HFC-143a/R-600

The evaluated performances of the refrigerant mixture comprising HFC-32/HFC-125/HFC-143a/R-600 at different weight percent of each constituents are described in Table 8, respectively. Referring to Table 8, it can be found that the performance of the compositions indicated in each item of Table 2 fall within the ranges between those of HFC407C and HFC-410A, so that the tested refrigerant mixture is useful as a substitute for HCFC-22.

›Example 8. Evaluation of Performance of Refrigerant Mixture of HFC-32/HFC-125/HFC-143a/HFE-134

The evaluated performances of the refrigerant mixture comprising HFC-32/HFC-125/HFC-143a/HFE-134 at different weight percent of each constituents are described in Table 9, respectively. Referring to Table 9, it can be found that the performance of the compositions indicated in each item of Table 2 fall within the range between those of HFC407C and HFC-410A, so that the tested refrigerant mixture is useful as a substitute for HCFC-22.

›Example 9. Evaluation of Performance of Refrigerant Mixture of HFC-32/HFC-125/HFC-143a/HFE-245

The evaluated performances of the refrigerant mixture comprising HFC-32/HFC-125/HFC-143a/HFE-245 at different weight percent of each constituents are described in Table 10, respectively. Referring to Table 10, it can be found that the formance of the compositions indicated in each item of Table 2 fall within the ranges between those of HFC407C and HFC-410A, so that the tested ant mixture is useful as a substitute for HCFC-22.

As apparent from the above description, the present invention provides a refrigerant composition, which is useful as a substitute for HCFC-22, produced by mixing additionally any one component of RC-270, HFC-227ea, HFC-245cb, R-600a, RC-318, HFC-236ea, R-600, HFE-134 and HFE-245 with a mixture of HFC-32, HFC-125 and HFC-143a. The refrigerant composition according to the present invention has an advantage in that it does not damage the ozone layer, so there is no possibility of restricted in use in the future. The above materials, which are components of the refrigerant composition according to the present invention, are currently commercially available, or active research for those materials is being conducted to make them commercially available in the near future.

As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalence of such meets and bounds are therefore intended to be embraced by the appended claims.

›Tables in the description — 10

TABLE 1 — Evaluated performance of HCFC-22, HFC-407C and HFC-410A

Comparative		HCFC-22	HFC-32	HFC-125	HFC-134a		VC	P L	P H
example No.	refrigerant	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kPa)
1	HCFC-22	100	—	—	—	5.45	3338	455	1254
2	HFC-407C	—	23	25	52	4.98	3412	460	1445
3	HFC-410A	—	50	50	—	5.31	5117	730	1993

TABLE 2 — Evaluated performance of refrigerant mixture of HFC-32/HFC-125/HFC-143a/RC-270

Composition	HFC-32	HFC-125	HFC-143a	RC-270		VC	P L	P H
No.	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kpa)
1	40	30	30	0	5.20	4797	701	1919
2	30	35	30	5	5.06	4702	714	1949
3	35	30	30	5	5.09	4820	726	1975
4	25	35	35	5	4.98	4548	698	1923
5	40	30	28	2	5.17	4868	718	1957
6	42	25	30	3	5.18	4929	728	1973
7	42	23	32	3	5.18	4922	728	1970
8	42	18	37	3	5.20	4910	726	1959
9	42	10	45	3	5.20	4889	724	1948
10	42	5	50	3	5.20	4877	724	1942
11	42	0	55	3	5.20	4865	723	1937
12	45	0	55	0	5.26	4814	702	1891
13	33	0	60	7	5.11	4759	726	1941
14	33	0	58	7	5.11	4761	727	1942
15	28	2	60	10	5.04	4677	725	1940

TABLE 3 — Evaluated performance of refrigerant mixture of HFC-32/HFC-125/HFC-143a/HFC-277ea

Composition	HFC-32	HFC-125	HFC-143a	HFC-227ea		VC	P L	P H
No.	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kpa)
1	28	2	60	10	5.04	4322	644	1803
2	35	0	60	5	5.14	4554	673	1847
3	45	10	45	0	5.26	4841	705	1904
4	30	30	35	5	5.06	4493	667	1865
5	30	40	28	2	5.06	4554	677	1891
6	40	5	50	5	5.20	4688	687	1875
7	35	33	25	7	5.13	4631	679	1891
8	40	15	30	15	5.18	4642	674	1872
9	50	15	15	20	5.26	4866	695	1917
10	45	20	10	25	5.17	4705	673	1897
11	50	20	0	30	5.22	4807	681	1918
12	48	7	5	40	5.09	4572	649	1875
13	35	45	12	8	5.11	4670	684	1919
14	40	50	7	3	5.18	4870	708	1962
15	40	5	50	3	5.20	4688	687	1875

TABLE 4 — Evaluated performance of refrigerant mixture of HFC-32/HFC-125/HFC-143a/HFC-245cb

Composition	HFC-32	HFC-125	HFC-143a	HFC-245cb		VC	P L	P H
No.	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kpa)
1	40	5	50	5	5.19	4633	676	1854
2	30	40	20	10	4.99	4360	641	1839
3	50	20	10	20	5.20	4630	652	1843
4	60	10	5	25	5.25	4720	655	1847
5	70	2	13	15	5.41	5040	701	1899
6	80	2	3	15	5.47	5180	712	1917
7	85	0	0	15	5.51	5235	716	1916
8	45	30	15	10	5.22	4739	678	1886
9	45	45	8	2	5.24	4946	712	1959
10	55	8	30	7	5.35	4927	701	1895
11	50	10	40	0	5.31	4940	714	1919
12	60	5	5	30	5.21	4908	638	1822
13	50	6	4	40	5.03	4180	576	1732

TABLE 5 — Evaluated performance of refrigerant mixture of HFC-32/HFC-125/HFC-143a/R600a

Composition	HFC-32	HFC-125	HFC-143a	R-600a		VC	P L	P H
No.	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kpa)
1	40	20	30	10	5.08	4722	716	1947
2	45	10	40	5	5.20	4887	726	1953
3	40	30	30	0	5.20	4797	701	1919
4	38	35	20	7	5.10	4748	714	1955
5	48	15	35	2	5.26	4951	723	1946
6	50	5	43	2	5.28	4963	724	1940
7	45	0	40	15	5.02	4673	714	1946

TABLE 6 — Evaluated performance of refrigerant mixture of HFC-32/HFC-125/HFC-143a/RC-318

Composition	HFC-32	HFC-125	HFC-143a	RC-318		VC	P L	P H
No.	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kpa)
1	35	30	25	10	5.11	4791	716	1970
2	45	20	30	5	5.23	4955	724	1967
3	48	10	40	2	5.28	4938	718	1933
4	30	15	40	15	5.00	4623	705	1952
5	40	30	30	0	5.20	4797	701	1919
6	43	0	50	7	5.22	4883	721	1943
7	40	35	20	5	5.17	4890	719	1972

TABLE 7 — Evaluated performance of refrigerant mixture of HFC-32/HFC-125/HFC-143a/HFC-236ea

Composition	HFC-32	HFC-125	HFC-143a	HFC-236ea		VC	P L	P H
No.	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kpa)
1	40	20	30	10	5.06	4487	646	1844
2	55	30	10	5	5.31	5076	722	1972
3	30	20	48	2	5.08	4467	663	1842
4	60	5	20	15	5.20	4781	671	1884
5	70	10	0	20	5.13	4789	661	1899
6	35	18	40	7	5.08	4457	650	1832
7	75	0	5	20	5.22	4902	677	1904
8	50	25	25	0	5.31	4994	718	1941

TABLE 8 — Evaluated performance of refrigerant mixture of HFC-32/HFC-125/HFC-143a/R600

Composition	HFC-32	HFC-125	HFC-143a	RF-600		VC	P L	P H
No.	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kpa)
1	40	25	30	5	5.14	4708	698	1911
2	50	20	20	10	5.09	4711	693	1920
3	55	10	33	2	5.34	5042	728	1945
4	53	15	25	7	5.28	4970	726	1948
5	35	30	32	3	5.13	4635	689	1893
6	60	0	28	12	5.10	4797	705	1938
7	45	40	10	5	5.21	4886	715	1954
8	45	50	0	5	5.20	4920	717	1972
9	40	45	15	0	5.19	4859	708	1951

TABLE 9 — Evaluated performance of refrigerant mixture of HFC-32/HFC-125/HFC-143a/HFE-134

Composition	HFC-32	HFC-125	HFC-143a	HFE-134		VC	P L	P H
No.	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kpa)
1	70	20	5	5	5.21	4904	675	1904
2	80	10	2	8	5.09	4766	647	1878
3	85	5	0	10	5.02	4665	629	1857
4	88	0	10	2	5.42	5248	721	1938
5	65	15	15	5	5.18	4815	669	1890
6	75	2	20	3	5.72	5054	702	1917
7	60	8	30	2	5.30	4950	700	1909
8	50	30	15	5	5.10	4619	649	1865
9	40	40	15	5	4.99	4440	632	1847
10	50	25	25	0	5.31	4994	718	1941

TABLE 10 — Evaluated performance of refrigerant mixture of HFC-32/HFC-125/HFC-143a/HFE-245

Composition	HFC-32	HFC-125	HFC-143a	HFE-245		VC	P L	P H
No.	(wt %)	(wt %)	(wt %)	(wt %)	COP	(kJ/m 3 )	(kPa)	(kpa)
1	40	40	15	5	5.03	4545	655	1881
2	80	5	5	10	5.10	4868	674	1921
3	70	10	12	8	5.24	4952	690	1920
4	60	0	38	2	5.37	5047	719	1924
5	50	25	20	5	5.20	4795	683	1902
6	50	32	13	5	5.19	4807	683	1912
7	52	15	30	3	5.31	4921	703	1909
8	85	7	0	8	5.47	5289	725	1946
9	65	15	15	5	5.26	4980	707	1936
10	50	25	25	0	5.31	4994	718	1941

Claims as granted

9 claims

Classifications

2 codes

IPC · International Patent Classification

Section C — Chemistry; metallurgy

C09K5/04

USPC · US Patent Classification

252/67

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