Heat transfer compositions and use thereof

Abstract

This invention relates to the field of refrigeration and heating, and discloses a heat transfer composition and its application. The heat transfer composition comprises: halomethane I, fluoropropylene II, and fluoroethane III, wherein the content of halomethane I is x wt%, the content of fluoropropylene II is y wt%, and the content of fluoroethane III is z wt%. In the three-phase composition diagram, the coordinates (x, y, z) are located on the triangular region enclosed by points A (75.1, 23.9, 1.0), B (75.1, 5.0, 19.9), and C (94.0, 5.0, 1.0), line segments AB, BC, and CA. The heat transfer composition provided by this invention has a low GWP value, is environmentally friendly, has good heat exchange performance, low application cost, and is applicable to a wide range of scenarios. It can directly replace heat transfer compositions R410A or R404A without requiring modification or replacement of existing heat exchange devices.

Description

Heat transfer compositions and their applications Technical Field

[0001] This invention relates to the field of refrigeration and heating, and more specifically to a heat transfer composition and its application. Background Technology

[0002] With the increasing prominence of ozone layer depletion and the greenhouse effect, the international community successively adopted the Montreal Protocol and the Kyoto Protocol to phase out chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) and limit greenhouse gas emissions. The Montreal Protocol has successfully phased out nearly 99% of ozone-depleting substances, including CFCs with high global warming potential (GWP). However, some alternatives, such as hydrofluorocarbons (HFCs), still have high GWP values. Therefore, in accordance with the requirements of the Montreal Protocol and the Kyoto Protocol, the demand for alternative refrigerants is increasing in various countries. Besides requiring new refrigerants to be non-damaging to the ozone layer, they also need to have low GWP values ​​and superior energy efficiency.

[0003] The composition R410A (composed of 50% difluoroethylene and 50% pentafluoroethane) is non-toxic, non-flammable, non-corrosive, and has an ODP value of 0. It exhibits good safety and refrigeration performance and is used to replace the traditional HCFC-22 refrigerant, primarily in central air conditioning multi-split systems, chillers, and other refrigeration applications. However, R410A has a high GWP value of 2088, indicating a strong greenhouse effect, and is classified as a greenhouse gas under the Kyoto Protocol.

[0004] Currently, there are many heat transfer compositions available to replace R410A, with GWP values ​​ranging from 150 to 1000. CN102482560B discloses a heat transfer composition containing difluoromethane, 2,3,3,3-tetrafluoropropylene, and 1,1-difluoroethane, whose COP (coefficient of performance) is comparable to that of R410A. However, the difluoromethane content in this composition is less than 75 wt%, resulting in an average boiling point above -48°C, higher than R410A's -51.5°C. Due to its excessively high boiling point, replacing R410A with this heat transfer composition requires modification or replacement of existing equipment, making direct replacement impossible and increasing the cost of replacing R410A. CN117136224A and CN117242154A disclose heat transfer compositions containing 2,3,3,3-tetrafluoropropylene, difluoromethane, and 1,1-difluoroethane, respectively. These compositions are environmentally friendly and suitable for automotive air conditioning thermal management systems. However, their average boiling points are much higher than R410A, making them unsuitable for heat transfer systems that use R410A, thus increasing the cost of replacing R410A. Composition R454B (composed of 68.9% difluoroethylene and 31.1% 2,3,3,3-tetrafluoropropylene) has a weaker greenhouse effect, but its heat transfer efficiency is lower than that of R410A, and its operating cost is high. Therefore, given the increasing demands for energy conservation and environmental protection, continued efforts are needed to find more environmentally friendly, efficient, and cost-effective alternatives to R410A. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of severe greenhouse effect, poor cooling effect and high cost in the existing technology, and to provide a heat transfer composition with low GWP value, environmental friendliness, good heat exchange effect, low cost and wide applicability and its application.

[0006] According to a first aspect of the present invention, a heat transfer composition is provided, comprising: halomethane I, fluoropropylene II, and fluoroethane III. As shown in FIG1, by mass, the content of halomethane I is x wt%, the content of fluoropropylene II is y wt%, and the content of fluoroethane III is z wt%. In the composition ternary diagram, the coordinates (x, y, z) are located on the triangular region enclosed by points A (75.1, 23.9, 1.0), B (75.1, 5.0, 19.9), and C (94.0, 5.0, 1.0), line segments AB, BC, and CA.

[0007] According to a second aspect of the invention, the invention provides an application of the heat transfer composition of the invention, the application comprising: circulating the heat transfer composition as a working fluid in a heat exchange device. Preferably, the heat exchange device is selected from heat exchange devices for residential, commercial, heat pump systems, refrigeration equipment, industrial refrigeration, automotive, data center, and mobile refrigeration equipment; and / or the heat transfer composition is used as a substitute for heat transfer compositions R410A or R404A.

[0008] The heat transfer composition provided by this invention has a low GWP value, is environmentally friendly, and has a good heat exchange effect.

[0009] Furthermore, the present invention provides a heat transfer composition that is low in application cost and widely applicable. Attached Figure Description

[0010] Figure 1 is a three-phase diagram of the composition of halomethane I, fluoropropylene II, and fluoroethane III in the heat transfer composition;

[0011] Figures 2-4 show preferred embodiments when the fluoropropylene II in the heat transfer composition is 3,3,3-trifluoropropylene.

[0012] Figures 5-7 show preferred embodiments when the fluoropropylene II in the heat transfer composition is hexafluoropropylene;

[0013] Figures 8 and 9 show preferred embodiments when the fluoropropylene II in the heat transfer composition is 2,3,3,3-tetrafluoropropylene. Detailed Implementation

[0014] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the invention. The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values; these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0015] This invention provides a heat transfer composition comprising: halomethane I, fluoropropylene II, and fluoroethane III. As shown in Figure 1, by mass, the content of halomethane I is x wt%, the content of fluoropropylene II is y wt%, and the content of fluoroethane III is z wt%. In the three-phase composition diagram, the coordinates (x, y, z) are located on the triangular region enclosed by points A (75.1, 23.9, 1.0), B (75.1, 5.0, 19.9), and C (94.0, 5.0, 1.0), line segments AB, BC, and CA. For example, (x, y, z) can be (85, 10, 5), (85, 5, 10), (90, 5, 5), (81, 15, 4), (88, 5, 7), (84, 15, 1), (87, 5, 8), or (80, 5, 15). The heat transfer composition with the aforementioned characteristics has low GWP, high CAP and COP, and is environmentally friendly while having good heat exchange performance.

[0016] In this invention, the range of possible halomethanes I is relatively wide, as illustrated below, but this does not limit the scope of the invention. According to a preferred embodiment of the invention, halomethane I is difluoromethane.

[0017] In this invention, the range of fluoropropylene II is relatively wide, as illustrated below, but this does not limit the scope of the invention. According to a preferred embodiment of the invention, fluoropropylene II is selected from one or more of 3,3,3-trifluoropropylene, hexafluoropropylene, and 2,3,3,3-tetrafluoropropylene.

[0018] In this invention, the range of fluoroethane III is relatively wide. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, fluoroethane III is selected from one or more of monofluoroethane, 1,1-difluoroethane, 1,1,1,2-tetrafluoroethane, and pentafluoroethane.

[0019] In this invention, when fluoropropylene II is 3,3,3-trifluoropropylene, the range of selectable contents of halomethane I, fluoropropylene II, and fluoroethane III is relatively wide. The following is an illustrative example, but it does not limit the scope of this invention. According to a preferred embodiment of the invention, as shown in FIG2, in the three-phase composition diagram, the coordinates (x, y, z) are located at points A (75.1, 23.9, 1.0), C (94.0, 5.0, 1.0), D (75.1, 16.2, 8.7), and E (82.5, 5.0, 12.5), the straight line segment AD, and the curve segment DE (x, 0.0074089x). 2 -2.6855x+176.093, -0.0074089x 2+1.6855x-76.093), the area enclosed by the line segment EC, the line segment CA, and the line segment. For example, (x, y, z) can be (85, 10, 5), (85, 5, 10), (90, 5, 5), (81, 15, 4), (88, 5, 7). The heat transfer composition having the aforementioned characteristics has a boiling point close to that of the heat transfer composition R410A, and can directly replace R410A.

[0020] According to a more preferred embodiment of the present invention, as shown in FIG3, in the composition triphase diagram, the coordinates (x, y, z) are located at points C (94.0, 5.0, 1.0), F (78.3, 20.7, 1.0), and G (87.1, 5.0, 7.9), the straight line segment CF, and the curve segment FG (x, 0.023594x). 2 -5.6878x + 321.331, -0.023594x 2 +4.6878x-221.331), the straight line segment GC, and the area enclosed by the line segment. For example, (x, y, z) can be (85, 10, 5), (90, 5, 5), (88, 5, 7). The heat transfer composition with the aforementioned characteristics has a higher CAP.

[0021] According to another preferred embodiment of the present invention, as shown in FIG4, in the composition triphase diagram, the coordinates (x, y, z) are located at points B (75.1, 5.0, 19.9), H (88.5, 5.0, 6.5), and I (75.1, 22.6, 2.3), the straight line segment BH, and the curve segment HI (x, 0.0047469x). 2 -2.0895x+152.759, -0.0047469x 2 +1.0895x-52.759), the straight line segment IB, and the area enclosed by the line segment. For example, (x, y, z) can be (85, 5, 10) or (88, 5, 7). The heat transfer composition with the aforementioned characteristics has a higher COP.

[0022] According to another preferred embodiment of the invention, in the composition ternary phase diagram, the coordinates (x, y, z) are located at the intersection of points C, F, and G themselves, the straight line segment CF, the curved line segment FG, the straight line segment GC, and the region enclosed by said line segments, and points B, H, and I themselves, the straight line segment BH, the curved line segment HI, the straight line segment IB, and the region enclosed by said line segments. For example, (x, y, z) can be (88, 5, 7). The heat transfer composition having the aforementioned characteristics, with a boiling point close to that of heat transfer composition R410A, can achieve direct substitution of R410A while having higher CAP and COP.

[0023] In this invention, when fluoropropylene II is hexafluoropropylene, the range of selectable contents of halomethane I, fluoropropylene II, and fluoroethane III is relatively wide. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of the invention, as shown in FIG5, in the three-phase composition diagram, the coordinates (x, y, z) are located at points A (75.1, 23.9, 1.0), C (94.0, 5.0, 1.0), D' (75.1, 13.6, 11.3), and E' (81.9, 5.0, 13.1) themselves, the straight line segment AD', and the curve segment D'E' (x, -0.0006946x). 2 -1.1682x + 105.257, 0.0006946x 2 +0.1682x-5.257), line segment E'C, line segment CA, and the area enclosed by the line segments. For example, (x, y, z) can be (84, 15, 1), (85, 5, 10), (90, 5, 5), (87, 5, 8). The heat transfer composition having the aforementioned characteristics has a boiling point close to that of the heat transfer composition R410A, and can directly replace R410A.

[0024] According to a more preferred embodiment of the present invention, as shown in FIG6, in the composition ternary phase diagram, the coordinates (x, y, z) are located at points A (75.1, 23.9, 1.0), C (94.0, 5.0, 1.0), F' (75.1, 19.2, 5.7), and G' (86.2, 5.0, 8.8), the straight line segment AF', and the curve segment F'G' (x, 0.0028304x). 2 -1.7321x+133.303, -0.0028304x 2 +0.7321x-33.303), line segment G'C, line segment CA, and the area enclosed by the line segments. For example, (x, y, z) can be (84, 15, 1), (90, 5, 5), (87, 5, 8). The heat transfer composition with the aforementioned characteristics has a higher CAP.

[0025] According to another preferred embodiment of the present invention, as shown in FIG7, in the composition ternary phase diagram, the coordinates (x, y, z) are located at points B (75.1, 5.0, 19.9), H' (89.5, 5.0, 5.5), I' (75.1, 20.2, 4.7), the straight line segment BH', and the curve segment H'I' (x, 0.0044568x). 2 -1.7837x+128.996, -0.0044568x 2+0.7837x-28.996), the straight line segment I'B, and the area enclosed by the line segment. For example, (x, y, z) can be (85, 5, 10) or (87, 5, 8). The heat transfer composition with the aforementioned characteristics has a higher COP.

[0026] According to another preferred embodiment of the invention, in the composition ternary phase diagram, the coordinates (x, y, z) are located at the intersection of the regions enclosed by points A, C, F', and G' themselves, line segment AF', curve segment F'G', line segment G'C, line segment CA, and the regions enclosed by these line segments, and points B, H', and I' themselves, line segment BH', curve segment H'I', line segment I'B, and the regions enclosed by these line segments. For example, (x, y, z) could be (87, 5, 8). The heat transfer composition having the aforementioned characteristics, with a boiling point close to that of heat transfer composition R410A, can achieve a direct substitution of R410A while having higher CAP and COP.

[0027] In this invention, when fluoropropylene II is 2,3,3,3-tetrafluoropropylene, the range of selectable contents of halomethane I, fluoropropylene II, and fluoroethane III is relatively wide. The following is an illustrative example, but it does not limit the scope of this invention. According to a preferred embodiment of the invention, as shown in FIG8, in the three-phase composition diagram, the coordinates (x, y, z) are located at points A (75.1, 23.9, 1.0), C (94.0, 5.0, 1.0), D (75.1, 13.9, 11.0), and E (81.9, 5.0, 13.1), the straight line segment AD", and the curve segment D"E (x, 0.0008961x). 2 -1.4673x+119.098, -0.0008961x 2 +0.4673x-19.098), line segment E”C, line segment CA, and the area enclosed by the line segments. For example, (x, y, z) can be (85, 5, 10), (90, 5, 5), (84, 15, 1). The heat transfer composition having the aforementioned characteristics has a boiling point close to that of the heat transfer composition R410A, and can directly replace R410A.

[0028] According to another preferred embodiment of the present invention, as shown in FIG9, in the composition ternary phase diagram, the coordinates (x, y, z) are located at points A (75.1, 23.9, 1.0), B (75.1, 5.0, 19.9), H (86.3, 5.0, 8.7), I (84.4, 14.6, 1.0), the line segment AB, the line segment BH”, and the curve segment H”I (x, 2.2978x). 2 -397.304x+17178.778,-2.2978x 2+396.304x-17078.778), the straight line segment I”A and the area enclosed by the line segment. For example, (x, y, z) can be (85, 5, 10), (80, 5, 15), (84, 15, 1). The heat transfer composition with the aforementioned characteristics has a higher COP.

[0029] According to another preferred embodiment of the invention, in the composition ternary phase diagram, the coordinates (x, y, z) are located at the intersection of the regions enclosed by points A, C, D”, and E” themselves, line segment AD”, curve segment D”E”, line segment E”C, line segment CA, and the regions enclosed by these line segments, and points A, B, H”, and I” themselves, line segment AB, line segment BH”, curve segment H”I, line segment I”A, and the regions enclosed by these line segments. For example, (x, y, z) can be (85, 5, 10) or (84, 15, 1). The heat transfer composition having the aforementioned characteristics, with a boiling point close to that of the heat transfer composition R410A, can achieve a direct substitution of R410A while having higher CAP and COP.

[0030] According to a preferred embodiment of the present invention, the heat transfer composition further includes: substance IV.

[0031] In this invention, the range of possible substances IV is relatively wide. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, substance IV is selected from one or more of the following: fluorinated olefins other than 3,3,3-trifluoropropene, hexafluoropropene and 2,3,3,3-tetrafluoropropene, C1-C4 alkanes, trifluoroiodomethane, carbon dioxide and dimethyl ether.

[0032] In this invention, the range of fluorinated olefins is relatively wide; fluorinated olefins other than 3,3,3-trifluoropropylene, hexafluoropropylene, and 2,3,3,3-tetrafluoropropylene can all achieve the objectives of this invention. According to a preferred embodiment of this invention, the fluorinated olefin is selected from one or more of 1,1,2-trifluoroethylene, trans-1,3,3,3-tetrafluoropropylene, and trans-1,2-difluoroethylene.

[0033] In this invention, the range of alkanes is relatively wide; all C1-C4 alkanes can achieve the objectives of this invention. According to a preferred embodiment of this invention, the alkanes are selected from one or more of propane and isobutane.

[0034] In this invention, the range of selectable content of substance IV is relatively wide. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the content of substance IV, based on the total mass of the composition, is 0.1-6 wt%, for example, 0.5 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, or 5 wt%.

[0035] Substance IV, which has the aforementioned characteristics, can further improve the CAP and COP of the heat transfer composition provided by the present invention, resulting in better heat exchange performance.

[0036] In this invention, the heat transfer composition can achieve the purpose of the invention as long as it possesses the aforementioned technical features. There are no special requirements for its preparation method. The following is an illustrative description of the preparation method of the heat transfer composition, but it does not limit the scope of the invention. For example, halomethane I, fluoropropylene II, fluoroethane III, and optionally substance IV are mixed in the liquid phase.

[0037] The present invention provides an application of the heat transfer composition of the present invention, the application including: the heat transfer composition being circulated as a working fluid in a heat exchange device.

[0038] In this invention, the heat exchange device has no special requirements, and commonly used types can achieve the purpose of this invention. According to a preferred embodiment of the present invention, the heat exchange device is selected from one of the following: heat exchange devices for household, commercial, heat pump systems, refrigeration equipment, industrial refrigeration, automotive, data center, and mobile refrigeration equipment.

[0039] The heat transfer composition of the present invention is particularly suitable as an alternative to heat transfer compositions R410A or R404A.

[0040] The application of heat transfer compositions with the aforementioned characteristics is compatible with various heat exchange devices during application. It can directly replace heat transfer compositions R410A or R404A without requiring modification or replacement of the original heat exchange devices, resulting in low application costs.

[0041] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

[0042] The present invention will be described in detail below through embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above description.

[0043] The average boiling point, relative CAP, and relative COP in the examples and comparative examples were obtained through theoretical calculations using the Refprop 10.0 database of fluid thermodynamics and transport properties from the National Institute of Standards and Technology (NIST).

[0044] Average boiling point: The average temperature of the gas and liquid phases of the composition at one standard atmosphere (101.3 kPa).

[0045] CAP: The product of the latent heat of the composition and its vapor density under refrigeration and heating cycle conditions.

[0046] COP: The ratio of the cooling capacity (or heating capacity) of the composition to the power consumption of the compressor under the following refrigeration (or heating) cycle conditions: evaporation temperature 5°C, condensation temperature 45°C, superheating temperature 10K, subcooling temperature 5K, and compressor efficiency 70%.

[0047] Relative CAP, relative COP: The ratio of the CAP and COP values ​​of the composition to the CAP and COP values ​​of R454B.

[0048] In the examples and comparative examples, the GWP values ​​were calculated as a weighted average of the GWP values ​​of each component by mass fraction. The GWP values ​​of each component were taken from the Fifth Report of the Intergovernmental Panel on Climate Change (IPCC).

[0049] Example 1

[0050] The following components were mixed in the liquid phase to obtain a heat transfer composition: 85g difluoromethane, 10g 3,3,3-trifluoropropylene, and 5g 1,1-difluoroethane.

[0051] Example 2

[0052] The following components were mixed in the liquid phase to obtain a heat transfer composition: 85g difluoromethane, 5g 3,3,3-trifluoropropylene, and 10g 1,1-difluoroethane.

[0053] Example 3

[0054] The following components were mixed in the liquid phase to obtain a heat transfer composition: 90g difluoromethane, 5g 3,3,3-trifluoropropylene, and 5g 1,1-difluoroethane.

[0055] Example 4

[0056] The following components were mixed in the liquid phase to obtain a heat transfer composition: 84g difluoromethane, 15g hexafluoropropylene, and 1g 1,1-difluoroethane.

[0057] Example 5

[0058] The following components were mixed in the liquid phase to obtain a heat transfer composition: 85g difluoromethane, 5g hexafluoropropylene, and 10g 1,1-difluoroethane.

[0059] Example 6

[0060] The following components were mixed in the liquid phase to obtain a heat transfer composition: 90g difluoromethane, 5g hexafluoropropylene, 5g 1,1-difluoroethane, and 3g trans-1,3,3,3-tetrafluoropropylene.

[0061] Example 7

[0062] The following components were mixed in the liquid phase to obtain a heat transfer composition: 85g difluoromethane, 5g 2,3,3,3-tetrafluoropropylene, and 10g 1,1-difluoroethane.

[0063] Example 8

[0064] The following components were mixed in the liquid phase to obtain a heat transfer composition: 90g difluoromethane, 5g 2,3,3,3-tetrafluoropropylene, 5g 1,1-difluoroethane, and 3g trans-1,3,3,3-tetrafluoropropylene.

[0065] Example 9

[0066] The following components were mixed in the liquid phase to obtain a heat transfer composition: 81g difluoromethane, 15g 3,3,3-trifluoropropylene, 4g 1,1-difluoroethane, and 3g carbon dioxide.

[0067] Example 10

[0068] The following components were mixed in the liquid phase to obtain a heat transfer composition: 88g difluoromethane, 5g 3,3,3-trifluoropropylene, and 7g 1,1-difluoroethane.

[0069] Example 11

[0070] The following components were mixed in the liquid phase to obtain a heat transfer composition: 87g difluoromethane, 5g hexafluoropropylene, and 8g 1,1-difluoroethane.

[0071] Example 12

[0072] The following components were mixed in the liquid phase to obtain a heat transfer composition: 90g difluoromethane, 5g 2,3,3,3-tetrafluoropropylene, and 5g 1,1-difluoroethane.

[0073] Example 13

[0074] The following components were mixed in the liquid phase to obtain a heat transfer composition: 80g difluoromethane, 5g 2,3,3,3-tetrafluoropropylene, 15g 1,1-difluoroethane, and 6g propane.

[0075] Example 14

[0076] The following components were mixed in the liquid phase to obtain a heat transfer composition: 88g difluoromethane, 5g 3,3,3-trifluoropropylene, and 7g monofluoroethane.

[0077] Example 15

[0078] The following components were mixed in the liquid phase to obtain a heat transfer composition: 84g difluoromethane, 15g 3,3,3-trifluoropropylene, and 1g 1,1,1,2-tetrafluoroethane.

[0079] Comparative Example 1

[0080] The heat transfer composition is R410A.

[0081] Comparative Example 2

[0082] The heat transfer composition is R404A.

[0083] Comparative Example 3

[0084] The heat transfer composition is R454B.

[0085] Table 1 shows the regions where the embodiments are located.

[0086]

[0087]

[0088] Table 2. Average boiling point, CAP, COP, and GWP of the Examples and Comparative Examples

[0089]

Claims

1. A heat transfer composition, characterized in that, The composition comprises difluoromethane, hexafluoropropylene, and 1,1-difluoroethane, with the following mass percentages: difluoromethane content x wt%, hexafluoropropylene content y wt%, and 1,1-difluoroethane content z wt%. In the three-phase composition diagram, the coordinates (x, y, z) are located on the points A (75.1, 23.9, 1.0), B (75.1, 5.0, 19.9), and C (94.0, 5.0, 1.0), as well as on the triangular region enclosed by line segments AB, BC, and CA. The heat transfer composition is used as a substitute for heat transfer composition R410A.

2. The heat transfer composition according to claim 1, wherein, In the composition triphase diagram, the coordinates (x, y, z) are located at points A (75.1, 23.9, 1.0), C (94.0, 5.0, 1.0), D' (75.1, 13.6, 11.3), and E' (81.9, 5.0, 13.1), as well as the line segment AD' and the curve segment D'E' (x, -0.0006946x). 2 -1.1682x + 105.257, 0.0006946x 2 +0.1682x-5.257), on the area enclosed by line segment E'C, line segment CA, and the line segment.

3. The heat transfer composition according to claim 2, wherein, The coordinates (x, y, z) lie within the points A (75.1, 23.9, 1.0), C (94.0, 5.0, 1.0), F' (75.1, 19.2, 5.7), and G' (86.2, 5.0, 8.8), the line segment AF', and the curve segment F'G' (x, 0.0028304x). 2 -1.7321x+133.303, -0.0028304x 2 +0.7321x-33.303), on the area enclosed by line segment G'C, line segment CA, and the line segment.

4. The heat transfer composition according to claim 1, wherein, In the composition triphase diagram, the coordinates (x, y, z) are located at points B (75.1, 5.0, 19.9), H' (89.5, 5.0, 5.5), I' (75.1, 20.2, 4.7), the straight line segment BH', and the curved segment H'I' (x, 0.0044568x). 2 -1.7837x+128.996,-0.0044568x 2 +0.7837x-28.996), the area enclosed by the straight line segment I'B and the line segment.

5. The heat transfer composition according to claim 4, wherein, The coordinates (x, y, z) lie at the intersection of the regions enclosed by points A, C, F', and G' themselves, line segment AF', curve segment F'G', line segment G'C, line segment CA, and the regions enclosed by these line segments, and points B, H', I' themselves, line segment BH', curve segment H'I', line segment I'B, and the regions enclosed by these line segments.

6. A heat transfer composition, characterized in that, The composition comprises difluoromethane, hexafluoropropylene, 1,1-difluoroethane, and substance IV in an amount of 0.1-6 wt%; by mass, the content of difluoromethane is x wt%, the content of hexafluoropropylene is y wt%, and the content of 1,1-difluoroethane is z wt%. In the composition ternary diagram, the coordinates (x, y, z) are located at points A (75.1, 23.9, 1.0), B (75.1, 5.0, 19.9), and C (94.0, 5.0, 1.0), as well as the triangular region enclosed by line segments AB, BC, and CA; substance IV is selected from one or more of fluoroolefins other than 3,3,3-trifluoropropylene, hexafluoropropylene, and 2,3,3,3-tetrafluoropropylene, C1-C4 alkanes, trifluoroiodomethane, carbon dioxide, and dimethyl ether; the heat transfer composition is used as a substitute for heat transfer composition R410A.

7. The heat transfer composition according to claim 6, wherein, In the composition triphase diagram, the coordinates (x, y, z) are located at points A (75.1, 23.9, 1.0), C (94.0, 5.0, 1.0), D' (75.1, 13.6, 11.3), and E' (81.9, 5.0, 13.1), as well as the line segment AD' and the curve segment D'E' (x, -0.0006946x). 2 -1.1682x + 105.257, 0.0006946x 2 +0.1682x-5.257), on the area enclosed by line segment E'C, line segment CA, and the line segment.

8. The heat transfer composition according to claim 7, wherein, The coordinates (x, y, z) lie within the points A (75.1, 23.9, 1.0), C (94.0, 5.0, 1.0), F' (75.1, 19.2, 5.7), and G' (86.2, 5.0, 8.8), the line segment AF', and the curve segment F'G' (x, 0.0028304x). 2 -1.7321x+133.303, -0.0028304x 2 +0.7321x-33.303), on the area enclosed by line segment G'C, line segment CA, and the line segment.

9. The heat transfer composition according to claim 6, wherein, In the composition triphase diagram, the coordinates (x, y, z) are located at points B (75.1, 5.0, 19.9), H' (89.5, 5.0, 5.5), I' (75.1, 20.2, 4.7), the straight line segment BH', and the curved segment H'I' (x, 0.0044568x). 2 -1.7837x+128.996,-0.0044568x 2 +0.7837x-28.996), the area enclosed by the straight line segment I'B and the line segment.

10. The heat transfer composition according to claim 9, wherein, The coordinates (x, y, z) lie at the intersection of the regions enclosed by points A, C, F', and G' themselves, line segment AF', curve segment F'G', line segment G'C, line segment CA, and the regions enclosed by these line segments, and points B, H', I' themselves, line segment BH', curve segment H'I', line segment I'B, and the regions enclosed by these line segments.

11. The heat transfer composition according to any one of claims 6-10, wherein, The fluoroolefins are selected from one or more of 1,1,2-trifluoroethylene, trans-1,3,3,3-tetrafluoropropylene and trans-1,2-difluoroethylene; and / or the C1-C4 alkanes are selected from one or more of propane and isobutane.

12. The application of a heat transfer composition according to any one of claims 1-11, characterized in that, The heat transfer composition circulates as a working fluid in the heat exchange device.

13. The application according to claim 12, wherein, The heat exchange device is selected from one of the following: heat exchange devices for household, commercial, heat pump systems, refrigeration equipment, industrial refrigeration, automotive, data center, and mobile refrigeration equipment.

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