Heat transfer composition and application thereof

Abstract

The invention discloses a heat transfer composition, which is prepared from the following components in percentage by mass: 30 to 99 percent of trans-1, 2-difluoroethylene and 1 to 70 percent of trifluoroacetyl fluoride. The ODP value of the heat transfer composition is 0, the GWP value of the heat transfer composition is smaller than 1, the heating capacity of the heat transfer composition is larger than that of trans-1, 2-difluoroethylene or trifluoroacetyl fluoride when the heat transfer composition is applied to a heat pump system, and the heat transfer composition can replace HFC-32 or R410A when the heat transfer composition is applied to a compression refrigeration system.

Description

Technical Field

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

[0002] Heat pump systems are highly efficient thermal systems that utilize external heat sources (such as geothermal, hydrothermal, air thermal, or solar energy). Their main function is to convert low-temperature heat into high-temperature heat to meet the needs of heating and hot water. The working principle of a heat pump system is based on thermodynamic principles. The specific process includes: absorbing heat from a low-temperature heat source (such as groundwater, surface water, soil, or air), and then converting the low-temperature heat into high-temperature heat through compression and expansion by equipment such as compressors, and then delivering it to the indoor environment or hot water system.

[0003] The working fluid in a heat pump can affect the system in many ways, including system performance, energy efficiency, and operational stability. Therefore, when selecting a heat pump working fluid, various factors need to be considered comprehensively to ensure the overall performance and economic benefits of the heat pump system. With increasing environmental awareness and technological advancements, future selection of heat pump working fluids will place greater emphasis on improving environmental performance and energy efficiency. Currently, the working fluids widely used in heat pump systems mainly include: 1) HFC-134a. HFC-134a is colorless, non-toxic, non-flammable, has low viscosity, and high latent heat of vaporization; however, its global warming potential (GWP = 1300) is facing reduction, and its heating performance is relatively poor. 2) HFO-1234yf. The physicochemical properties of HFO-1234yf are similar to those of HFC-134a, but its main limitation in application in the heat pump field is insufficient low-temperature heating capacity. 3) CO2: CO2 is currently a hot research topic. As a natural working fluid, it has excellent environmental performance. The main problem is that the transcritical cycle pressure is relatively high, and the system pressure resistance requirements need to be greatly improved compared with conventional working fluids, resulting in a higher overall system cost. 4) R410A: R410A is suitable for cryogenic conditions, but its high GWP (2256) limits its application prospects.

[0004] A compression refrigeration system mainly consists of a compressor, condenser, expansion valve, and evaporator. The refrigerant boils at low pressure. The compressor continuously draws in the vapor produced in the evaporator and compresses it to the condensing pressure, then sends it to the condenser. There, it isobarically cooled and condenses into a liquid at a higher pressure. The heat released during cooling and condensation is transferred to the cooling medium (usually water or air). The condensing temperature corresponding to the condensing pressure must be higher than the temperature of the cooling medium. The condensed liquid then enters the evaporator through the expansion valve or other throttling components. Utilizing the heat absorption and release phenomena that occur during the phase change of the refrigerant with its very low boiling point, and through a continuous cycle of compressor compression, condenser release, throttling and pressure reduction by the expansion valve, and evaporator absorption and vaporization, the system achieves the goal of lowering the temperature of the object being cooled.

[0005] The core of a compression heat transfer system is the refrigerant, which is often referred to as the system's "blood," directly affecting system performance and energy efficiency. As regulations on greenhouse gas emissions become increasingly stringent globally, particularly restrictions on the use of fluorocarbons, the refrigerant industry is being driven towards more environmentally friendly and efficient products. my country has officially frozen the production and consumption of high-GWP hydrofluorocarbon refrigerants (HFCs) and released relevant quota setting and allocation schemes. On July 2, 2024, my country's Ministry of Ecology and Environment released the "National Plan for China's Implementation of the Montreal Protocol on Substances that Deplete the Ozone Layer (2024-2030) (Draft for Comments)," which lists the controlled status of relevant industries and products, as detailed in the table below.

[0006]

[0007] Currently, refrigerants widely used in residential, commercial, and automotive air conditioning systems, such as R410A, R32, and R290, all have certain drawbacks. R410A and R32 have GWP values ​​of 2256 and 771 respectively, limiting their use. R290 has excellent environmental performance but high flammability, requiring a secondary circuit to enhance its safety, which in turn leads to poor system performance. Therefore, developing refrigerant compositions with both excellent environmental and system performance is a pressing issue for the refrigerant and refrigeration industries. Summary of the Invention

[0008] The purpose of this invention is to provide a heat transfer composition to solve the problem that existing working fluids do not take into account both environmental performance and system performance.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows:

[0010] The present invention provides a heat transfer composition comprising 30-99% by mass of trans-1,2-difluoroethylene and 1-70% by mass of trifluoroacetyl fluoride.

[0011] Furthermore, the heat transfer composition comprises 50-90% by mass of trans-1,2-difluoroethylene and 1-50% by mass of trifluoroacetyl fluoride.

[0012] The heat transfer composition also includes other impurities, such as hydrogen fluoride, carbon dioxide, or impurities that are difficult to remove during the preparation of trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroacetyl fluoride.

[0013] The heat transfer composition is an azeotropic mixture or a near-azeotropic mixture.

[0014] The heat transfer composition has an ODP value of 0 and a GWP value of <1.

[0015] The present invention also provides an application of a heat transfer composition, wherein the heat transfer composition is used as a working fluid in a heat pump system.

[0016] Furthermore, the heat transfer composition, when used as a working fluid in a heat pump system, has a greater heating capacity than trans-1,2-difluoroethylene when used in a heat pump system; the heat transfer composition, when used as a working fluid in a heat pump system, has a greater heating capacity than trifluoroacetyl fluoride when used in a heat pump system.

[0017] This invention also provides an application of a heat transfer composition, which is used as a working fluid in a compression refrigeration system. The refrigeration system is selected from household and commercial air conditioners, refrigerators (freezers), automotive air conditioners, commercial refrigeration equipment, and industrial refrigeration equipment.

[0018] The heat transfer composition replaces HFC-32 or R410A as the working fluid in compression refrigeration systems.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0020] (1) The heat transfer composition provided by the present invention has excellent environmental and safety performance, with an ODP value of 0 and a GWP value of <1.

[0021] (2) When the heat transfer composition provided by the present invention is applied to a heat pump system, the heating capacity of the system is greater than that of trans-1,2-difluoroethylene or trifluoroacetyl fluoride.

[0022] (3) When the heat transfer composition provided by the present invention is applied to a compression refrigeration system, it can replace HFC-32 or R410A and the system performance is excellent. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a heat pump system, where 1 is the evaporator, 2 is the compressor, 3 is the heat exchanger, 4 is the liquid storage tank, 5 is the filter, and 6 is the expansion valve.

[0024] Figure 2 This is a schematic diagram of a compression refrigeration system, where 1 is the evaporator, 2 is the compressor, 3 is the condenser, and 4 is the expansion valve. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments, but the invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all alternatives, improvements, and equivalents that may be included within the scope of the claims.

[0026] The basic physical properties of the components involved in this invention are shown in Table 1 below.

[0027] Table 1 Basic physical properties of substances

[0028] Component Chemical formula Molecular weight, g / mol Standard boiling point, °C ODP GWP Flammability R32 CH2F2 52.023 -51.6 0 771 Weakly flammable R410A / / -51.6 0 1730 Non-flammable HFO-1132(E) C2H2F2 64.034 -52.5 0 ＜1 Flammable Trifluoroacetyl fluoride C2F4O 116.014 -59.0 0 ＜1 Non-flammable

[0029] The heat transfer composition of this invention is prepared as follows: the components are mixed in liquid form at room temperature and pressure according to the corresponding mass percentages, and shaken evenly to form a uniform and stable composition.

[0030] Example 1:

[0031] The trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroacetyl fluoride were physically mixed at a mass ratio of 3:7 in a liquid phase at room temperature and pressure to obtain a composition.

[0032] Example 2:

[0033] The trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroacetyl fluoride were physically mixed at a mass ratio of 4:6 in a liquid phase at room temperature and pressure to obtain a composition.

[0034] Example 3:

[0035] The trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroacetyl fluoride were physically mixed at a mass ratio of 5:5 in a liquid phase at room temperature and pressure to obtain a composition.

[0036] Example 4:

[0037] The trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroacetyl fluoride were physically mixed at a mass ratio of 6:4 in a liquid phase at room temperature and pressure to obtain a composition.

[0038] Example 5:

[0039] The trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroacetyl fluoride were physically mixed at a mass ratio of 7:3 in a liquid phase at room temperature and pressure to obtain a composition.

[0040] Example 6:

[0041] The trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroacetyl fluoride were physically mixed at a mass ratio of 8:2 in a liquid phase at room temperature and pressure to obtain a composition.

[0042] Example 7:

[0043] The trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroacetyl fluoride were physically mixed at a mass ratio of 9:1 under normal temperature and pressure in the liquid phase to obtain a composition.

[0044] Example 8:

[0045] The trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroacetyl fluoride were physically mixed at a mass ratio of 99:1 in a liquid phase at room temperature and pressure to obtain a composition.

[0046] Comparative Example 1: Difluoromethane (HFC-32)

[0047] Comparative Example 2: R410A (HFC-32 / HFC-125, 50 / 50)

[0048] Comparative Example 3: trans-1,2-difluoroethylene (HFO-1132(E))

[0049] Comparative Example 4: Trifluoroacetylfluoride

[0050] The temperature glide at 1 MPa for each embodiment is shown in Table 2.

[0051] Table 2 Temperature glide of each embodiment

[0052] Item Temperature glide, °C (1 MPa) Example 1 0.2169 Example 2 0.7695 Example 3 1.4107 Example 4 1.8940 Example 5 2.0630 Example 6 1.8304 Example 7 1.1494 Example 8 0.1361

[0053] (1) Performance comparison of heat pump systems under operating conditions:

[0054] Table 3 shows the system heating capacity and system energy efficiency when using the heat transfer compositions of Examples 1-8 and Comparative Examples 1-4 under heat pump system operating conditions (i.e., evaporation temperature: -20℃; condensation temperature: 20℃).

[0055] Table 3 Comparison of various performance indicators of heat pump system under operating conditions

[0056]

[0057] In all embodiments of the present invention, the system heating performance is superior to that of HFO-32 and R410A under heat pump system operating conditions.

[0058] Example 1 showed an improvement of 17.0% and 25.0% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0059] Example 2 showed improvements of 18.2% and 26.2% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0060] Example 3 showed improvements of 19.5% and 27.6% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0061] Example 4 showed improvements of 18.9% and 27.0% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0062] Example 5 showed improvements of 18.7% and 26.7% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0063] Example 6 showed improvements of 18.5% and 26.5% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0064] Example 7 showed improvements of 16.3% and 24.2% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0065] Example 8 showed improvements of 15.8% and 23.6% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0066] In addition, in addition to having a significant advantage in heating performance compared to existing heat pump working fluids, Examples 1-7 also have advantages over any one component of the composition, meaning that the heating performance of the composition is better than that of any one component used alone.

[0067] Example 1 showed an improvement of 0.9% and 8.3% compared to Comparative Examples 3 and 4, respectively.

[0068] Example 2 showed improvements of 2.0% and 9.5% compared to Comparative Examples 3 and 4, respectively.

[0069] Example 3 showed an improvement of 3.1% and 10.7% compared to Comparative Examples 3 and 4, respectively.

[0070] Example 4 showed an improvement of 2.6% and 10.1% compared to Comparative Example 3 and Comparative Example 4, respectively.

[0071] Example 5 showed improvements of 2.4% and 9.9% compared to Comparative Examples 3 and 4, respectively.

[0072] Example 6 showed improvements of 2.3% and 9.8% compared to Comparative Examples 3 and 4, respectively.

[0073] Example 7 showed an improvement of 0.4% and 7.7% compared to Comparative Examples 3 and 4, respectively.

[0074] (2) Comparison of refrigeration performance

[0075] Table 4 shows the system cooling capacity and system energy efficiency when using the heat transfer compositions of Examples 1-8 and Comparative Examples 1-4 under compression refrigeration system conditions (i.e., evaporation temperature: 5°C; condensation temperature: 40°C).

[0076] Table 4 Comparison of performance indicators of compression refrigeration systems

[0077]

[0078] In all embodiments of the present invention, the system cooling performance is superior to that of HFO-32 and R410A under compression refrigeration system conditions.

[0079] Example 1 showed an improvement of 0.7% and 11.6% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0080] Example 2 showed improvements of 4.1% and 15.4% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0081] Example 3 showed improvements of 6.8% and 18.4% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0082] Example 4 showed improvements of 12.1% and 24.2% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0083] Example 5 showed improvements of 13.7% and 26.0% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0084] Example 6 showed improvements of 15.3% and 27.7% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0085] Example 7 showed improvements of 15.6% and 28.1% compared to Comparative Example 1 and Comparative Example 2, respectively.

[0086] In terms of environmental performance, the environmental performance (GWP) of all embodiments of the present invention is significantly better than that of Comparative Example 1 and Comparative Example 2.

Claims

1. A heat transfer composition characterized by: The heat transfer composition comprises 30-99% by mass of trans-1,2-difluoroethylene and 1-70% by mass of trifluoroacetyl fluoride.

2. The heat transfer composition of claim 1 wherein: The heat transfer composition comprises 50-90% by mass of trans-1,2-difluoroethylene and 1-50% by mass of trifluoroacetyl fluoride.

3. The heat transfer composition of claim 1 or 2 wherein: The composition is an azeotropic or azeotrope-like composition.

4. The heat transfer composition of claim 1 or 2 wherein: The ODP value of the heat transfer composition is 0, The GWP value is <1.

5. Use of a heat transfer composition according to any of claims 1 to 4, characterized in that: The heat transfer composition is used as a working medium in a heat pump system.

6. Use of a heat transfer composition according to claim 5, characterized in that: The heating capacity of the heat transfer composition used as a working medium in a heat pump system is greater than that of trans-1,2-difluoroethylene used as a working medium in a heat pump system; the heating capacity of the heat transfer composition used as a working medium in a heat pump system is greater than that of trifluoroacetyl fluoride used as a working medium in a heat pump system.

7. Use of a heat transfer composition according to any of claims 1 to 4, characterized in that: The heat transfer composition is used as a working medium in a compression refrigeration system.

8. Use of a heat transfer composition according to claim 7, characterized in that: The refrigeration system is selected from the group consisting of household and commercial air conditioners, refrigerators (cabinets), automobile air conditioners, commercial refrigeration equipment, and industrial refrigeration equipment.

9. Use of a heat transfer composition according to claim 7, characterized in that: The heat transfer composition is used as a working medium in a compression refrigeration system instead of HFC-32 or R410A.

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