阅读说明：本技术 一种含反式-1,1,1,4,4,4-六氟-2-丁烯的混合制冷剂及其应用 (Mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene and application thereof ) 是由 方一波 叶恭然 张靖鹏 吴曦蕾 李亚伦 李晨阳 周培旭 韩晓红 于 2021-05-24 设计创作，主要内容包括：本发明提供一种含反式-1,1,1,4,4,4-六氟-2-丁烯的环保混合制冷剂及其应用,该环保混合制冷剂按质量百分比计,由20～50％的反式-1,1,1,4,4,4-六氟-2-丁烯、0～80％的二氟甲烷和0～80％的氟乙烷组成。本发明所述的混合制冷剂不破坏大气臭氧层,GWP值低,对环境十分友好。本发明所述的混合制冷剂具有与R134a或R407C基本相当甚至更高的容积制冷量和系统性能系数,可应用于商业空调、移动空调等多种空调系统,可替代高GWP值的R134a或R407C。(The invention provides an environment-friendly mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene and an application thereof, wherein the environment-friendly mixed refrigerant consists of 20-50% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 0-80% of difluoromethane and 0-80% of fluoroethane in percentage by mass. The mixed refrigerant provided by the invention does not damage the atmospheric ozone layer, has a low GWP value, and is very environment-friendly. The mixed refrigerant has the volume refrigerating capacity and the system performance coefficient which are basically equivalent to or even higher than those of R134a or R407C, can be applied to various air-conditioning systems such as commercial air conditioners, mobile air conditioners and the like, and can replace R134a or R407C with high GWP value.)

1. The mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene is characterized by comprising, by mass, 20-50% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 0-80% of difluoromethane and 0-80% of fluoroethane.

2. The mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene as claimed in claim 1, which comprises 20 to 25% by mass of trans-1, 1,1,4,4, 4-hexafluoro-2-butene and 75 to 80% by mass of fluoroethane.

3. The mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene as claimed in claim 1, which comprises 20 to 25% by mass of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 50 to 65% by mass of difluoromethane and 10 to 30% by mass of fluoroethane.

4. The mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene as claimed in claim 1, which comprises, by mass, 25 to 45% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 10 to 45% of difluoromethane and 10 to 60% of fluoroethane.

5. Use of a mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene, wherein the mixed refrigerant according to any one of claims 1 to 4 is used in an air conditioning system.

Technical Field

The invention relates to the field of environment-friendly mixed refrigerants, in particular to a mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene and application thereof.

Background

Various refrigeration air-conditioning systems are widely applied to various fields of human life, business, industry and the like. According to the international society for refrigeration (IIF/IIR), there are about 3000 tens of thousands of refrigeration, air-conditioning and heat pump units in the international society, which consume about 17% of the global electric energy, and the refrigerant used in the system is still the largest ozone-consuming substance at present. At present, hydrofluorocarbon substances with zero ozone destruction potential, such as R134a, R407C and the like, are widely used as refrigerants in systems such as refrigeration, air-conditioning, heat pump and the like. However, most hydrofluorocarbon refrigerants have relatively high GWP values and are one of the major sources of greenhouse gases. R134a and R407C are two of the more widely used refrigerants in many air conditioning systems today. R134a is mainly used in car air conditioners, refrigerators, commercial central air conditioners, etc., while R407C is widely used in large-scale air conditioners and centrifugal units, especially in rail trains, subways, etc. Therefore, it is an object of the present invention to find alternative refrigerants having better environmental protection performance and system performance equivalent to or better than those of conventional hydrofluorocarbon refrigerants.

In the prior art, patent CN104508076A discloses a composition comprising (i) a first component selected from 90-99% by mass of propylene, and (ii) a second component selected from 1-10% by mass of butylene, ethylene and ethane or a mixture thereof. When used as a refrigerant, the patent recognizes that the mixture has a coefficient of performance of the system comparable to that of R407C. However, lower quality hydrocarbons are extremely flammable and are typically rated as a safety rating of a3(ASHRAE Standard 34). The mixture is composed entirely of combustible hydrocarbon materials, and thus has a very high flammability, requiring extra attention to charge and safety precautions for use. Patent CN112552877A discloses a quaternary mixture of R125, R32, R161, R1216, or a quinary mixture with certain R13I1 added. When used as a refrigerant, the patent states that the quaternary or quinary mixture has a higher volumetric refrigeration capacity and comparable COP than R407C, and that three non-flammable substances R1216, R125, and R13I1 are effective in suppressing the flammability of R32 and R161. However, R1216 has certain toxicity, and the published data shows that the R1216 may have certain damage to organs such as the kidney of a human body. Patent CN110484209B discloses an environment-friendly mixed working fluid, wherein the first component is trifluoroiodomethane, the second component is fluoroethane, the third component is difluoromethane, and the fourth component is trans-1, 3,3, 3-tetrafluoropropene or propylene. Compared with the prior art, the difference is that the binary or ternary mixed refrigerant is formed by matching trans-1, 1,1,4,4, 4-hexafluoro-2-butene with difluoromethane or fluoroethane or a mixture of the difluoromethane and the fluoroethane to be used for an air conditioning system.

Disclosure of Invention

Based on the problems in the prior art, the invention provides a mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene and application thereof, and aims to provide a green environment-friendly refrigerant which can be applied to various mobile and commercial air-conditioning systems.

Difluoromethane (R32) is a highly efficient hydrofluorocarbon refrigerant. Difluoromethane has a GWP of about 675, about half that of R134a, one third that of R407C. The volume refrigerating capacity and COP value of difluoromethane are both higher, but the boiling point of difluoromethane is relatively lower, the system operates the pressure high, the compressor exhaust temperature is high, need to design the specialized compressor. Furthermore, difluoromethane also has some flammability. Fluoroethane (R161) is also a highly efficient hydrofluorocarbon refrigerant with a GWP of only about 12, which is not subject to the regulation list of the Bulgarian amendment, and therefore can be used as a potential substitute refrigerant under the current situation of controlling carbon emission. From both theoretical and experimental aspects, some scholars compare the system performances of fluoroethane and R134a and R407C, and consider that fluoroethane has the potential to be a direct substitute for the two. However, fluoroethane also has a certain flammability, and when used, the safety of the system needs to be paid attention. Trans-1, 1,1,4,4, 4-hexafluoro-2-butene (R1336mzz (E)) is a hydrofluoroolefin with very little GWP of about 7, is non-flammable, has a normal boiling point of about 7.5 ℃, has good thermal performance, and is considered as one of the potential working fluids in high temperature heat pump systems and organic rankine cycles.

Different substances are mixed in a proper proportion, so that the defects of pure working media can be effectively complemented, and a mixed working medium with better comprehensive performance is formed. The technical idea of the invention is as follows: the non-combustible trans-1, 1,1,4,4, 4-hexafluoro-2-butene with extremely low GWP value is mixed with difluoromethane or fluoroethane and a mixture thereof, so that the GWP value of the mixed working medium can be further reduced by utilizing the good environmental friendliness of the trans-1, 1,1,4,4, 4-hexafluoro-2-butene on one hand; on the other hand, the incombustibility of the trans-1, 1,1,4,4, 4-hexafluoro-2-butene is utilized to inhibit the combustibility of difluoromethane or fluoroethane and the mixture thereof, thereby improving the safety performance during operation. In addition, trans-1, 1,1,4,4, 4-hexafluoro-2-butene, which has a relatively high boiling point, can further reduce the system operating pressure and the compressor discharge temperature, which is particularly beneficial for difluoromethane and mixtures thereof, thereby ensuring that the mixed refrigerant in a certain ratio can have an operating pressure and discharge temperature substantially close to that of R134a or R407C.

Specifically, the invention adopts the following technical scheme:

a mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene comprises, by mass, 20-50% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 0-80% of difluoromethane and 0-80% of fluoroethane.

As one of the preferable schemes of the invention, the mixed refrigerant comprises the following components in percentage by mass: 20-25% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene and 75-80% of fluoroethane.

As one of the preferable schemes of the invention, the mixed refrigerant comprises the following components in percentage by mass: 20-25% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 50-65% of difluoromethane and 10-30% of fluoroethane.

As one of the preferable schemes of the invention, the mixed refrigerant comprises the following components in percentage by mass: 25-45% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 10-45% of difluoromethane and 10-60% of fluoroethane.

The invention also provides an application of the mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene, and the mixed refrigerant is applied to an air-conditioning system to improve the environmental protection performance of the air-conditioning system.

Compared with the existing R407C and R134a working media, the invention has the following beneficial effects:

(1) better environmental protection performance: the ODP of the mixed refrigerant provided by the invention is 0, the mixed refrigerant has no damage effect on the atmospheric ozone layer, the GWP values are all less than 630, and the mixed refrigerant meets the current environmental protection requirements for protecting the ozone layer and reducing the greenhouse effect.

(2) Similar or superior refrigeration performance: the mixed refrigerant provided by the invention has volume refrigerating capacity and COP basically equivalent to or even better than R134a or R407C, and when the mixed refrigerant is applied to an air-conditioning system, the exhaust temperature is close to the exhaust pressure and R134a or R407C, and the mixed refrigerant can be directly applied to the existing R134a or R407C air-conditioning system.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Those skilled in the art should understand that they can make modifications and equivalents without departing from the spirit and scope of the present invention, and all such modifications and equivalents are intended to be included within the scope of the present invention.

(1) Comparison with R134a

Example 1: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene and 80% fluoroethane;

example 2: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 5% difluoromethane and 75% fluoroethane;

example 3: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 10% difluoromethane and 70% fluoroethane;

example 4: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 15% difluoromethane and 65% fluoroethane;

example 5: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 20% difluoromethane and 60% fluoroethane;

example 6: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 25% difluoromethane and 55% fluoroethane;

example 7: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 30% difluoromethane and 50% fluoroethane;

example 8: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene and 75% fluoroethane;

example 9: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 5% difluoromethane and 70% fluoroethane;

example 10: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 10% difluoromethane and 65% fluoroethane;

example 11: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 15% difluoromethane and 60% fluoroethane;

example 12: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 20% difluoromethane and 55% fluoroethane;

example 13: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 25% difluoromethane and 50% fluoroethane;

example 14: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 30% difluoromethane and 45% fluoroethane;

example 15: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 35% difluoromethane and 40% fluoroethane;

example 16: the mixed refrigerant comprises the following components in percentage by mass: 30% trans-1, 1,1,4,4, 4-hexafluoro-2-butene and 70% fluoroethane;

example 17: the mixed refrigerant comprises the following components in percentage by mass: 30% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 5% difluoromethane and 65% fluoroethane;

example 18: the mixed refrigerant comprises the following components in percentage by mass: 30% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 10% of difluoromethane and 60% of fluoroethane;

example 19: the mixed refrigerant comprises the following components in percentage by mass: 30% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 15% difluoromethane and 55% fluoroethane;

example 20: the mixed refrigerant comprises the following components in percentage by mass: 30% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 20% difluoromethane and 50% fluoroethane;

example 21: the mixed refrigerant comprises the following components in percentage by mass: 30% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 25% difluoromethane and 45% fluoroethane;

example 22: the mixed refrigerant comprises the following components in percentage by mass: 30% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 30% difluoromethane and 40% fluoroethane;

example 23: the mixed refrigerant comprises the following components in percentage by mass: 30% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 35% of difluoromethane and 35% of fluoroethane;

example 24: the mixed refrigerant comprises the following components in percentage by mass: 30% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 40% difluoromethane and 30% fluoroethane;

example 25: the mixed refrigerant comprises the following components in percentage by mass: 30% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 45% difluoromethane and 25% fluoroethane;

example 26: the mixed refrigerant comprises the following components in percentage by mass: 35% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 15% difluoromethane and 50% fluoroethane;

example 27: the mixed refrigerant comprises the following components in percentage by mass: 35% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 20% difluoromethane and 45% fluoroethane;

example 28: the mixed refrigerant comprises the following components in percentage by mass: 35% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 25% difluoromethane and 40% fluoroethane;

example 29: the mixed refrigerant comprises the following components in percentage by mass: 35% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 30% difluoromethane and 35% fluoroethane;

example 30: the mixed refrigerant comprises the following components in percentage by mass: 35% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 35% difluoromethane and 30% fluoroethane;

example 31: the mixed refrigerant comprises the following components in percentage by mass: 35% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 40% difluoromethane and 25% fluoroethane;

example 32: the mixed refrigerant comprises the following components in percentage by mass: 35% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 45% difluoromethane and 20% fluoroethane;

example 33: the mixed refrigerant comprises the following components in percentage by mass: 35% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 50% difluoromethane and 15% fluoroethane;

example 34: the mixed refrigerant comprises the following components in percentage by mass: 40% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 25% difluoromethane and 35% fluoroethane;

example 35: the mixed refrigerant comprises the following components in percentage by mass: 40% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 30% difluoromethane and 30% fluoroethane;

example 36: the mixed refrigerant comprises the following components in percentage by mass: 40% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 35% difluoromethane and 25% fluoroethane;

example 37: the mixed refrigerant comprises the following components in percentage by mass: 40% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 40% difluoromethane and 20% fluoroethane;

example 38: the mixed refrigerant comprises the following components in percentage by mass: 40% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 45% difluoromethane and 15% fluoroethane;

example 39: the mixed refrigerant comprises the following components in percentage by mass: 40% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 50% difluoromethane and 10% fluoroethane;

example 40: the mixed refrigerant comprises the following components in percentage by mass: 40% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 55% difluoromethane and 5% fluoroethane;

example 41: the mixed refrigerant comprises the following components in percentage by mass: 45% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 35% of difluoromethane and 20% of fluoroethane;

example 42: the mixed refrigerant comprises the following components in percentage by mass: 45% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 40% of difluoromethane and 15% of fluoroethane;

example 43: the mixed refrigerant comprises the following components in percentage by mass: 45% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 45% difluoromethane and 10% fluoroethane;

example 44: the mixed refrigerant comprises the following components in percentage by mass: 45% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 50% of difluoromethane and 5% of fluoroethane;

example 45: the mixed refrigerant comprises the following components in percentage by mass: 50% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 50% of difluoromethane.

The environmental parameters and thermal performance of the refrigerant of the above examples are shown in table 1 under the ARI Standard 520 international Standard air conditioning conditions (condensation temperature 54.4 ℃, evaporation temperature 7.2 ℃, superheat temperature 11.1 ℃, subcooling temperature 8.3 ℃, compressor isentropic efficiency 0.75).

TABLE 1 refrigeration Performance of examples and comparative example (R134a)

As can be seen from Table 1, the GWP of the binary or ternary mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene provided by the invention is less than 520 and is much lower than that of R134a, and the ODP is 0 and is environment-friendly.

From the aspect of refrigeration performance, the binary or ternary mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene provided by the invention has excellent comprehensive system performance, has the capacity refrigeration capacity and COP which are basically equivalent to or even better than R134a, and the capacity refrigeration capacity is 102-135% of R134a, and the COP is 95-103% of R134 a. In addition, the discharge temperature of the binary or ternary mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene provided by the invention is close to the discharge pressure and R134a, and the binary or ternary mixed refrigerant can be directly applied to a pipeline system of the conventional R134a air conditioner.

Preferably, aiming at the binary or ternary mixed refrigerant provided by the invention, a heat regenerator is additionally arranged in the system flow, and a countercurrent heat exchange device is selected, so that the temperature-changing matching capability of the non-azeotropic working medium is further exerted, and the comprehensive performance of the system is further improved.

(2) Comparison with R407C

Example 46: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 40% difluoromethane and 40% fluoroethane;

example 47: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 45% difluoromethane and 35% fluoroethane;

example 48: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 50% difluoromethane and 30% fluoroethane;

example 49: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 55% difluoromethane and 25% fluoroethane;

example 50: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 60% difluoromethane and 20% fluoroethane;

example 51: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 65% difluoromethane and 15% fluoroethane;

example 52: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 70% difluoromethane and 10% fluoroethane;

example 53: the mixed refrigerant comprises the following components in percentage by mass: 20% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 75% difluoromethane and 5% fluoroethane;

example 54: the mixed refrigerant comprises the following components in percentage by mass: 20% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene and 80% of difluoromethane;

example 55: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 55% difluoromethane and 20% fluoroethane;

example 56: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 60% difluoromethane and 15% fluoroethane;

example 57: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 65% difluoromethane and 10% fluoroethane;

example 58: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene, 70% difluoromethane and 5% fluoroethane;

example 59: the mixed refrigerant comprises the following components in percentage by mass: 25% trans-1, 1,1,4,4, 4-hexafluoro-2-butene and 75% difluoromethane;

example 60: the mixed refrigerant comprises the following components in percentage by mass: 30% of trans-1, 1,1,4,4, 4-hexafluoro-2-butene and 70% of difluoromethane.

The environmental parameters and thermal performance of the refrigerant of the above examples are shown in table 2 under the ARI Standard 520 international Standard air conditioning conditions (condensation temperature 54.4 ℃, evaporation temperature 7.2 ℃, superheat temperature 11.1 ℃, subcooling temperature 8.3 ℃, compressor isentropic efficiency 0.75).

TABLE 2 refrigeration Performance of examples and comparative example (R407C)

As can be seen from Table 2, the GWP values of the binary or ternary mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene provided by the invention are both less than 630 and much lower than that of R407C, and the ODP is 0 and is environment-friendly.

From the aspect of refrigeration performance, the binary or ternary mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene provided by the invention has excellent comprehensive system performance, has volume refrigeration capacity and COP which are basically equivalent to or even better than R407C, and the volume refrigeration capacity is 91-113% of R407C, and the COP is 92-100% of R407C. In addition, the discharge temperature of the binary or ternary mixed refrigerant containing trans-1, 1,1,4,4, 4-hexafluoro-2-butene provided by the invention is close to the discharge pressure and R407C, and the binary or ternary mixed refrigerant can be directly applied to a pipeline system of the conventional R407C air conditioner.

Preferably, aiming at the binary or ternary mixed refrigerant provided by the invention, a heat regenerator is additionally arranged in the system flow, and a countercurrent heat exchange device is selected, so that the temperature-changing matching capability of the non-azeotropic working medium is further exerted, and the comprehensive performance of the system is further improved.

In conclusion, compared with the R134a or R407C, the mixed refrigerant provided by the invention has better environmental protection performance, better meets the current requirements of controlling carbon emission, has equivalent or even better system performance, has approximate operating pressure and exhaust temperature, and has good adaptability to the existing R134a air-conditioning system and the R407C air-conditioning system. Therefore, the mixed refrigerant provided by the invention has excellent application prospect.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core ideas. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.