CN113025280B - Mixed refrigerant replacing R507A - Google Patents
Mixed refrigerant replacing R507A Download PDFInfo
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- CN113025280B CN113025280B CN202110272281.6A CN202110272281A CN113025280B CN 113025280 B CN113025280 B CN 113025280B CN 202110272281 A CN202110272281 A CN 202110272281A CN 113025280 B CN113025280 B CN 113025280B
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- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
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Abstract
The invention discloses a mixed refrigerant for replacing R507A, which comprises, by mass, 10-64% of difluoromethane, 1-67% of 1,3,3,3-tetrafluoroethylene, 5-21% of pentafluoroethane and 3-50% of trifluoroiodomethane. The mixed refrigerant has lower GWP value and zero ODP value, can obtain better thermodynamic performance parameters, and has good environmental performance.
Description
Technical Field
The invention relates to a refrigerant, in particular to a mixed refrigerant for replacing R507A.
Background
At present, global warming is becoming more serious in recent years, and in order to cope with extreme weather changes caused by global warming, paris climate change will pass through a new protocol paris agreement for coping with global changes in 2015 years, and is officially signed by 175 countries in 2016, and actions for coping with global climate change are arranged after 2020. To reduce greenhouse gas emissions, montreal protocol 28, entitled "Montreal protocol" held in capital California at Lu Wangda, 2016, was agreed to achieve historical modifications of Hydrofluorocarbons (HFCs), known as "Basgali modifications," which are limited control greenhouse gases. The schedule of eliminating the high-greenhouse effect HFCs in each country is clear, and the high-greenhouse effect HFCs are formally effective in 2019 in 1 month.
In the field of freezing and refrigerating, R507A is a refrigerant which is relatively commonly used, but has higher GWP (the GWP is as high as 3985), R454A, R454C, R A, R457A, R459B and the like are used as substitutes of R507A, and although the GWP meets the requirement of being less than 150, the refrigerant belongs to a weakly combustible (A2L) mixed refrigerant, and the filling amount cannot exceed 1.2kg, so the refrigerant can only be used for small equipment such as refrigerators, freezers and the like, but cannot be used for equipment such as ordinary freezers, refrigerated transport vehicles, refrigerated containers and the like. R448A, R449A as a substitute for R507A is a non-flammable refrigerant (grade A1), but also has a GWP of up to 1300, with lower refrigeration performance than R507A.
Comprehensively comparing the thermodynamic performance, the environmental performance and other factors of the substitute refrigerant and R507A, the invention provides a quaternary mixture R32/R1234yf/R125/R13I1 as a substitute of the R507A refrigerant.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the mixed refrigerant which has a lower GWP value, a zero ODP value, better thermodynamic performance parameters and good environmental performance and is used for replacing R507A and replacing R507A.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a mixed refrigerant for replacing R507A comprises, by mass, 10% -64% of difluoromethane, 1% -67% of 2,3,3,3-tetrafluoropropene, 5% -21% of pentafluoroethane and 3% -50% of trifluoroiodomethane.
Further, the composition comprises, by mass, 18% -55% of difluoromethane, 15% -48% of 2,3,3,3-tetrafluoropropene, 7% -18% of pentafluoroethane and 8% -42% of trifluoroiodomethane.
Further, the composition comprises, by mass, 30% -45% of difluoromethane, 15% -48% of 2,3,3,3-tetrafluoropropene, 7% -18% of pentafluoroethane and 8% -42% of trifluoroiodomethane.
Further, the composition comprises, by mass, 18% -55% of difluoromethane, 15% -48% of 2,3,3,3-tetrafluoropropene, 9% -16% of pentafluoroethane and 8% -42% of trifluoroiodomethane.
Further, the composition comprises, by mass, 18% -55% of difluoromethane, 31% -37% of 2,3,3,3-tetrafluoropropene, 7% -18% of pentafluoroethane and 20% -29% of trifluoroiodomethane.
Further, the composition comprises, by mass, 23% -49% of difluoromethane, 26% -42% of 2,3,3,3-tetrafluoropropene, 9% -16% of pentafluoroethane and 14% -35% of trifluoroiodomethane.
Further, the composition comprises, by mass, 23% -49% of difluoromethane, 26% -42% of 2,3,3,3-tetrafluoropropene, 11% -14% of pentafluoroethane and 14% -35% of trifluoroiodomethane.
Further, the composition comprises, by mass, 23% -49% of difluoromethane, 26% -42% of 2,3,3,3-tetrafluoropropene, 11% -14% of pentafluoroethane and 20% -29% of trifluoroiodomethane.
Further, the composition comprises, by mass, 30% -45% of difluoromethane, 31% -37% of 2,3,3,3-tetrafluoropropene, 9% -16% of pentafluoroethane and 14% -35% of trifluoroiodomethane.
Further, the composition comprises, by mass, 30-45% of difluoromethane, 31-37% of 2,3,3,3-tetrafluoropropene, 11-14% of pentafluoroethane and 20-29% of trifluoroiodomethane.
The invention has the advantages and positive effects that: the mixed refrigerant replacing R507A has lower GWP value and zero ODP value, can obtain better thermodynamic performance parameters, and has good environmental performance. By comprehensively comparing the thermodynamic property, the environmental property and other parameters of the invention and R507A, the invention has the following advantages:
1. the ODP of the mixed refrigerant is zero, and the GWP value is lower than the R507A value, so that the mixed refrigerant is more environment-friendly.
2. Compared with R507A, the refrigerating capacity per unit volume and COP of the mixed refrigerant are slightly larger, and the mixed refrigerant is better than the R507A refrigerant in system performance and can replace the R507A refrigerant.
3. The refrigerant can reach the incombustible degree, and the safety can be guaranteed.
4. The invention can completely replace R507A refrigerant with higher GWP value in the field of medium and low temperature freezing and refrigeration, and has popularization value.
Detailed Description
To further clarify the contents, features and effects of the present invention, the following examples are given by way of illustration and are described in detail below:
a mixed refrigerant replacing R507A comprises 10-64% of difluoromethane, 1-67% of 2,3,3,3-tetrafluoropropene, 5-21% of pentafluoroethane and 3-50% of trifluoroiodomethane in percentage by mass.
The percentage of each component refers to the percentage of the mass of the component in the total mass of the mixed refrigerant.
If the total mass of the mixed refrigerant is X; then multiplying the mass X by 10-64% of difluoromethane; 2,3,3,3-tetrafluoropropene with mass X multiplied by 1% -67%; pentafluoroethane with the mass of X multiplied by 5-21%; trifluoroiodomethane with the mass of X multiplied by 3-50 percent; these 4 components are physically mixed uniformly in a liquid phase state. Or the four components can be uniformly mixed according to the corresponding proportion by adopting a conventional physical mixing method. The following description is analogized to this.
The preparation method of the mixed refrigerant comprises the step of physically mixing the four component substances according to the specified mass percentage ratio at normal temperature. The basic physical properties of the four components are shown in table 1:
table 1 the basic parameters of the four components difluoromethane, 2,3,3,3-tetrafluoropropene, pentafluoroethane and trifluoroiodomethane include: tb: normal boiling point, tc: critical temperature, pc: critical pressure
Preferably, the composition comprises 18-55% of difluoromethane, 15-48% of 2,3,3,3-tetrafluoropropene, 7-18% of pentafluoroethane and 8-42% of trifluoroiodomethane in percentage by mass.
Preferably, the composition comprises 30-45% of difluoromethane, 15-48% of 2,3,3,3-tetrafluoropropene, 7-18% of pentafluoroethane and 8-42% of trifluoroiodomethane in percentage by mass.
Preferably, the composition comprises 18-55% of difluoromethane, 15-48% of 2,3,3,3-tetrafluoropropene, 9-16% of pentafluoroethane and 8-42% of trifluoroiodomethane in percentage by mass.
Preferably, the composition comprises 18-55% of difluoromethane, 31-37% of 2,3,3,3-tetrafluoropropene, 7-18% of pentafluoroethane and 20-29% of trifluoroiodomethane in percentage by mass.
Preferably, the composition comprises, by mass, 23% to 49% of difluoromethane, 26% to 42% of 2,3,3,3-tetrafluoropropene, 9% to 16% of pentafluoroethane and 14% to 35% of trifluoroiodomethane.
Preferably, the composition comprises, by mass, 23% to 49% of difluoromethane, 26% to 42% of 2,3,3,3-tetrafluoropropene, 11% to 14% of pentafluoroethane and 14% to 35% of trifluoroiodomethane.
Preferably, the composition comprises, by mass, 23% to 49% of difluoromethane, 26% to 42% of 2,3,3,3-tetrafluoropropene, 11% to 14% of pentafluoroethane and 20% to 29% of trifluoroiodomethane.
Preferably, the composition comprises 30-45% of difluoromethane, 31-37% of 2,3,3,3-tetrafluoropropene, 9-16% of pentafluoroethane and 14-35% of trifluoroiodomethane in percentage by mass.
Preferably, the composition comprises 30-45% of difluoromethane, 31-37% of 2,3,3,3-tetrafluoropropene, 11-14% of pentafluoroethane and 20-29% of trifluoroiodomethane in percentage by mass.
The following specific examples were obtained by mixing difluoromethane, 2,3,3,3-tetrafluoropropene, pentafluoroethane, and trifluoroiodomethane in different ratios within the above ranges.
Example 1
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 10%/67%/20%/3% under normal pressure to obtain the mixed refrigerant.
And taking the total mass of the mixed refrigerant as X, multiplying X by 10% of R32 (difluoromethane), multiplying X by 67% of R1234yf (2,3,3,3-tetrafluoropropene), multiplying X by 20% of R125 (pentafluoroethane) and multiplying X by 3% of R13I1 (trifluoroiodomethane), and uniformly mixing by adopting a common physical method under normal pressure to obtain the mixed refrigerant. The following description is analogized to this.
R32 is the code of refrigerant difluoromethane, R1234yf is the code of refrigerant 2,3,3,3-tetrafluoropropene, R125 is the code of refrigerant pentafluoroethane, and R13I1 is the code of refrigerant trifluoroiodomethane.
Example 2
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 25%/67%/5%/3% under normal pressure to obtain the mixed refrigerant.
Example 3
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 10%/60%/21%/9% under normal pressure to obtain the mixed refrigerant.
Example 4
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 16%/61%/18%/5% under normal pressure to obtain the mixed refrigerant.
Example 5
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 20%/37%/14%/29% under normal pressure to obtain the mixed refrigerant.
Example 6
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 27%/52%/8%/13% under normal pressure to obtain the mixed refrigerant.
Example 7
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 30%/22%/10%/38% under normal pressure to obtain the mixed refrigerant.
Example 8
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 28%/12%/10%/50% under normal pressure to obtain the mixed refrigerant.
Example 9
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 33%/1%/16%/50% under normal pressure to obtain the mixed refrigerant.
Example 10
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 38%/7%/5%/50% under normal pressure to obtain the mixed refrigerant.
Example 11
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 15%/15%/20%/50% under normal pressure to obtain the mixed refrigerant.
Example 12
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 44%/37%/11%/8% under normal pressure to obtain the mixed refrigerant.
Example 13
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 27%/21%/9%/43% under normal pressure to obtain the mixed refrigerant.
Example 14
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 48%/12%/7%/33% under normal pressure to obtain the mixed refrigerant.
Example 15
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 52%/11%/12%/25% under normal pressure to obtain the mixed refrigerant.
Example 16
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 55%/1%/14%/30% under normal pressure to obtain the mixed refrigerant.
Example 17
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 60%/19%/11%/10% under normal pressure to obtain the mixed refrigerant.
Example 18
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 64%/28%/5%/3% under normal pressure to obtain the mixed refrigerant.
Example 19
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 49%/42%/6%/3% under normal pressure to obtain the mixed refrigerant.
Example 20
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percentage of 10%/48%/7%/35% under normal pressure to obtain the mixed refrigerant.
Example 21
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 41%/42%/9%/8% under normal pressure to obtain the mixed refrigerant.
Example 22
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 36%/42%/14%/8% under normal pressure to obtain the mixed refrigerant.
Example 23
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed according to the mass percentage of 49%/26%/14%/11% under normal pressure by adopting a common physical method to obtain the mixed refrigerant.
Example 24
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 36%/34%/16%/14% under normal pressure to obtain the mixed refrigerant.
Example 25
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 30%/34%/20%/16% under normal pressure to obtain the mixed refrigerant.
Example 26
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 23%/42%/15%/20% under normal pressure to obtain the mixed refrigerant.
Example 27
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 27%/31%/12%/30% under normal pressure to obtain the mixed refrigerant.
Example 28
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 23%/26%/9%/42% under normal pressure to obtain the mixed refrigerant.
Example 29
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 18%/15%/18%/49% under normal pressure to obtain the mixed refrigerant.
Example 30
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 18%/48%/12%/22% under normal pressure to obtain the mixed refrigerant.
Example 31
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 18%/42%/18%/22% under normal pressure to obtain the mixed refrigerant.
Example 32
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 18%/42%/7%/33% under normal pressure to obtain the mixed refrigerant.
Example 33
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 23%/26%/18%/33% under normal pressure to obtain the mixed refrigerant.
Example 34
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 32%/26%/9%/33% under normal pressure to obtain the mixed refrigerant.
Example 35
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 45%/26%/9%/20% under normal pressure to obtain the mixed refrigerant.
Example 36
The four components of R32 (difluoromethane), R1234yf (2,3,3,3-tetrafluoropropene), R125 (pentafluoroethane) and R13I1 (trifluoroiodomethane) are uniformly mixed by adopting a general physical method according to the mass percent of 55%/16%/9%/20% under normal pressure to obtain the mixed refrigerant.
The above examples are reported in Table 2 together with the basic parameters of the R507A refrigerant, such as the environmental performance and the temperature glide (at a normal atmospheric pressure of 101.325 kPa).
Wherein the relative molecular weight (g/mol), the standard boiling point (. Degree. C.), the critical temperature (. Degree. C.), and the critical pressure (MPa) are obtained from REFPERP 10.0, which is a query for physical properties of a refrigerant developed by the National Institute of Standards and Technology (NIST).
The temperature glide (DEG C) is calculated by Matlab software calling REFPROP 10.0 software.
GWP value data is from 2018REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTE issued by THE environmental planning agency OF THE United nations.
TABLE 2 basic physical parameters of mixed refrigerant and R507A
As can be seen from Table 2, the GWP value of the mixed refrigerant provided by the invention is far lower than that of R507A, and the mixed refrigerant has an advantage in the aspect of environmental protection as a substitute refrigerant of R507A. The temperature slip of each embodiment is small, and the adverse effect caused by the temperature slip of the refrigerant when the system operates can be reduced.
The results of comparing the above examples with thermodynamic parameters (discharge pressure and temperature) and relative system performance (relative volumetric refrigeration capacity and relative COP to R507A for each example) of R507A under refrigeration conditions of-23 ℃ evaporation temperature, 43 ℃ condensation temperature, 12 ℃ superheat degree, 5 ℃ supercooling degree and 0.8 compressor overall efficiency are shown in table 3.
TABLE 3 Performance comparison of refrigerant blends with R507A
Wherein, the exhaust pressure (Bar), the exhaust temperature (DEG C), the relative volume refrigerating capacity and the relative COP data are obtained by calculating the state parameters of each point of the circulation by calling REFPROP 10.0 software by Matlab software according to the circulation of the single-stage compression steam refrigerator.
The safety is in accordance with ISO 817.
As can be seen from Table 3, the mixed refrigerant provided by the invention has better performance than R507A under the refrigeration working condition. In various embodiments, COP is improved by 4% to 9.6% over R507A refrigerant. Except for the embodiments 1-4, 20 and 30-32, the refrigerating capacity per unit volume is improved by 4 percent to 59 percent relative to the R507A refrigerant. The discharge pressure and the discharge temperature are slightly higher than R507A, which shows the feasibility of replacing the new refrigerant in the aspect of performance effect. Since R13I1 and R125 are typical flame retardants and R32 and R234yf are weakly flammable refrigerants, the above embodiments are weakly flammable or non-flammable, increasing the safety of the system operation and working environment.
According to the introduction of the invention, under the above design working condition of the refrigerating system and in the preferred proportion range calculated by the theory, the system coefficient of performance COP and the refrigerating capacity per unit volume of the new refrigerant are higher than R507A. The outstanding advantage is that the GWP value of the new refrigerant is greatly reduced compared with R507A, and the effect of non-flammability can be achieved in the aspect of flammability. In conclusion, the invention has very good application effect and development potential.
The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to carry out the same, and the present invention shall not be limited to the embodiments, i.e. the equivalent changes or modifications made within the spirit of the present invention shall fall within the scope of the present invention.
Claims (1)
1. A mixed refrigerant for replacing R507A is characterized by consisting of, by mass, 23% -49% of difluoromethane, 26% -42% of 2,3,3,3-tetrafluoropropene, 9% -16% of pentafluoroethane and 14% -35% of trifluoroiodomethane.
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| US20130096218A1 (en) * | 2010-06-22 | 2013-04-18 | Arkema Inc. | Heat transfer compositions of hydrofluorocarbons and a hydrofluoroolefin |
| US20180030325A1 (en) * | 2016-07-29 | 2018-02-01 | Honeywell International Inc. | Heat transfer methods, systems and compositions |
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