Refrigerant composition for air conditioning device

Abstract

The present invention relates to a refrigerant composition for an air conditioning device, the composition having characteristics similar to those of R410A, having a sufficiently low global warming coefficient (GWP), and comprising 1,1-difluoroethene (R1132a) and trifluoroiodomethane (R13I1).

Description

Refrigerant composition for air conditioning equipment

[0001] The present invention relates to a refrigerant composition for an air conditioning device, and more particularly, to a refrigerant composition for an air conditioning device comprising 1,1-difluoroethene (C2F2H2 or R1132a) and trifluoroiodomethane (TFIM; CF3I or R13I1).

[0002] 1,1-Difluoroethene (R1132a) has a boiling point of -84℃, a very low global warming potential (GWP), high heat capacity, and a lower flammability rating compared to hydrocarbons.

[0003] Trifluoroiodomethane (CF3I) is a refrigerant with a very low global warming potential. It is also a non-flammable refrigerant, capable of reducing the flammability of flammable refrigerants. The flammability of a flammable refrigerant can be reduced by physical dilution with a non-flammable refrigerant. For example, R410A refrigerant is made non-flammable by mixing the non-flammable pentafluoroethane (C2HF5; HFC-125 or R125) with the weakly flammable difluoromethane (CH2F2; HFC-32 or R32).

[0004] R410A refrigerant is currently primarily used in air conditioning systems such as air conditioners. However, this refrigerant is non-flammable and has a high global warming potential. Previously, non-flammable refrigerants were primarily used in industrial applications such as refrigeration and freezing warehouses and air conditioning systems. As environmental regulations increasingly restrict the use of these refrigerants with high global warming potentials, the need for refrigerants with low global warming potentials is growing. However, among refrigerants with low global warming potentials, hydrocarbon refrigerants that can replace non-flammable refrigerants are generally highly flammable.

[0005] There is a need for a blended refrigerant having a non-flammable or weakly flammable refrigerant with high heat capacity and low global warming potential.

[0006] The present invention has been proposed to solve the problems of the above-mentioned prior art, and has the same heating and cooling performance as R410A, and the same level of cooling as R1234yf, but especially excellent heating capacity, so that in the case of electric vehicles, the heat absorption capacity (Capacity) is improved so that the heat pump system can be operated alone without an electric heater in a cold region, and the Global Warming Potential (GWP) is sufficiently small in compliance with refrigerant regulations, and has the safety of being non-flammable (A1) or slightly flammable (A2L class), and in addition to all the characteristics generally required for refrigerants, it can be used as is in an R410A air conditioning unit or can be used with minimal modifications, including a hose pipe for preventing vibration, in an air conditioning unit used with R1234yf.

[0007] For the above purpose, the present invention provides a refrigerant composition for an air conditioning device comprising 1,1-difluoroethene (R1132a) and trifluoroiodomethane (R13I1).

[0008] In the above, 1,1-difluoroethene (R1132a) is characterized as being 30 to 60 wt% and trifluoroiodomethane (R13I1) is characterized as being 40 to 70 wt%.

[0009] In the above, 1,1-difluoroethene (R1132a) is characterized as being 35 to 50 wt%, and trifluoroiodomethane (R13I1) is characterized as being 50 to 65 wt%.

[0010] In the above, the composition is characterized in that it includes at least one compound selected from the group consisting of difluoromethane, carbon dioxide, tetrafluoropropene, and trans-1,3,3,3-tetrafluoropropene.

[0011] In the above, the composition is

[0012] 30∼59wt% 1,1-difluoroethene, 40∼69wt% trifluoroiodomethane, 1∼30wt% difluoromethane;

[0013] 30∼59wt% 1,1-difluoroethene, 40∼69wt% trifluoroiodomethane, 1∼10wt% carbon dioxide;

[0014] 30∼59wt% 1,1-difluoroethene, 40∼69wt% trifluoroiodomethane, 1∼30wt% tetrafluoropropene; or

[0015] It is characterized by containing 30∼59 wt% 1,1-difluoroethene, 40∼69 wt% trifluoroiodomethane, and 1∼30 wt% trans-1,3,3,3-tetrafluoropropene.

[0016] In the above, the composition includes at least one of propadiene, myrcene, and libonene, which is added to the mass ratio of refrigerating oil to be 0.001 to 0.1 wt%, respectively, to prevent corrosion of components.

[0017] In addition, a refrigerant composition for an air conditioning device is provided, characterized in that the composition is used as a refrigerant for an air conditioning system.

[0018] In the above, the air conditioning system is characterized in that a rubber hose made of EPDM rubber (Ethylene Propylene Diene Monomer rubber) or HNBR (Hydrogenated nitrile butadiene rubber) is used.

[0019] The refrigerant composition for an air conditioning device according to the present invention has a heating capacity equivalent to that of R410A and superior to that of R1234yf, a global warming potential (GWP) of 150 or less, and is non-flammable (A1 class) or non-flammable (A2L class) according to ASHRAE standards, has an ozone depletion potential (ODP) of 0, is simple to manufacture, and can be used as is in home air conditioning devices using R410A, and can be replaced with minimal modification in automotive air conditioning devices using R134a or R1234yf.

[0020] Figure 1 is a graph showing the saturated vapor pressure according to the mixing ratio.

[0021] All technical and scientific terms used in the description of the present invention, unless otherwise defined, have the meanings commonly understood by those of ordinary skill in the art to which this disclosure pertains. All terms used in this disclosure have been selected for the purpose of more clearly explaining this disclosure and are not intended to limit the scope of rights under this disclosure.

[0022] Expressions such as “comprising,” “having,” and the like used in the description of the present invention should be understood as open-ended terms that imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included.

[0023] The singular forms used in the description of the present invention may include plural meanings unless otherwise stated, and the same applies to the singular forms set forth in the claims.

[0024] The expressions “first,” “second,” etc. used in the description of the present invention are used to distinguish between multiple components, and do not limit the order or importance of the components.

[0025] When it is mentioned in the description of the present invention that a component is "connected" or "coupled" to another component, it should be understood that the component can be directly connected or coupled to the other component, or can be connected or coupled via a new other component.

[0026] Glossary of Terms

[0027] In this specification, the term "replacement", when used in the context of "replacing" a first refrigerant with a second refrigerant, means that, in a device designed to operate using a first refrigerant as the first type, only a few parts (at least one of refrigerant oil, gaskets, packing, expansion valve, dryer, and other parts) need to be changed and the device adjusted, so that the device can be operated under optimal conditions using the second refrigerant. In other words, this type refers to operating the same device by "replacing" the refrigerant.

[0028] As for the forms of this type of "replacement", there are "drop-in replacement", "nearly drop-in replacement", and "retrofit" in order of the degree of change or adjustment required when replacing with a second refrigerant.

[0029] The term "replacement" also includes equipment designed to operate using a second refrigerant, such as Type 2, and using the second refrigerant for the same purpose as the first refrigerant. This type refers to providing a "replacement" refrigerant for the same purpose.

[0030]

[0031] Referring to the attached drawings below, the refrigerant composition for an air conditioning device of the present invention will be described in detail.

[0032] Figure 1 is a graph showing the saturated vapor pressure according to the mixing ratio.

[0033]

[0034] A refrigerant composition for an air conditioning device according to the present invention (hereinafter referred to as a “refrigerant composition” for convenience of explanation) comprises 1,1-difluoroethene (C2F2H2 or R1132a) and trifluoroiodomethane (TFIM; CF3I or R13I1).

[0035] The above refrigerant composition comprises 1,1-difluoroethene (R1132a) in an amount of 30 to 60 wt% and trifluoroiodomethane (R13I1) in an amount of 40 to 70 wt%. It is preferable that the above refrigerant composition comprises 1,1-difluoroethene (R1132a) in an amount of 35 to 50 wt% and trifluoroiodomethane (R13I1) in an amount of 50 to 65 wt%.

[0036] The above refrigerant composition may further include at least one compound selected from the group consisting of difluoromethane, carbon dioxide, tetrafluoropropene, and trans-1,3,3,3-tetrafluoropropene.

[0037] When the above compound is included in the above refrigerant composition, the 1,1-difluoroethene (R1132a) is included in an amount of 30 to 59 wt%, and the trifluoroiodomethane (R13I1) is included in an amount of 40 to 69 wt%.

[0038] The above difluoromethane may be included in the refrigerant composition in an amount of 1 to 30 wt% for the purpose of reducing the temperature gradient of the two phases.

[0039] The above carbon dioxide may be included in the refrigerant composition of the present invention in an amount of 1 to 10 wt% for the purpose of reducing the temperature gradient of the two phases.

[0040] The above tetrafluoropropene may be included in the refrigerant composition of the present invention in an amount of 1 to 30 wt% for the purpose of reducing the temperature gradient of the two phases.

[0041] The above trans-1,3,3,3-tetrafluoropropene may be included in the refrigerant composition of the present invention in an amount of 1 to 30 wt% for the purpose of reducing the temperature gradient of the two phase.

[0042] A refrigerant comprising the above refrigerant composition may further include refrigerating oil in the refrigerant composition.

[0043] The above refrigerating oil is typically POE (Polyolester) oil and may additionally contain a small amount of additives. The refrigerating oil is added to the refrigerant composition to lubricate the compressor's moving parts and thereby improve the durability of the compressor.

[0044] The above refrigerating oil may contain a small amount of one or more of the additives propadiene, myrcene, and libonene. The small amount of the additive is included in an amount of 0.001 to 0.1 wt% of the refrigerating oil for the purpose of solving the problem of filter clogging caused by the formation of a coagulant by the reaction of trifluoroiodomethane (CF3I) and a metal.

[0045] Table 1 below shows the physical properties of each single substance, 1,1-difluoroethene (R1132a) and trifluoroiodomethane (R13I1).

[0046] Item 1,1-Difluoroethene (R1132a) Trifluoroiodomethane (R13I1) Molecular weight (g / mol) 64 195.9 Boiling point (℃) -83 -21.9 Vapor pressure (@20℃, MPa) 3.5 70.43 LFL (vol%) 5.5 - Heat of combustion (MJ / ㎏) 170.9 Burning velocity (㎝ / s) 27.8 - Flammability class A2A1 Global warming potential (GWP) < 31 Ozone layer depletion potential (ODP) 00

[0047] (LFL: Lower Flammability Limit)

[0048] Hereinafter, the refrigerant composition of the present invention will be described in more detail by way of examples, but these examples are merely illustrative of the present invention, and the scope of the present invention is not limited to the examples.

[0049] A refrigerant composition comprising 35 wt% of 1,1-difluoroethene (R1132a) and 65 wt% of trifluoroiodomethane (R13I1) according to the present invention (hereinafter referred to as “refrigerant composition example of the present invention”) is described in comparison with R410A and R1234yf.

[0050] The above refrigerant compositions, 1,1-difluoroethene (R1132a) and trifluoroiodomethane (R13I1), do not change their properties even when mixed at a certain ratio, and are a near-aerobic composition in which each other's shortcomings are compensated for, thereby maintaining environmentally friendly characteristics.

[0051] The molecular weight, boiling point, saturated vapor pressure, flammability rating, global warming potential (GWP), and ozone layer depletion potential (ODP) values ​​of the refrigerant composition examples of the present invention were compared with those of R410A and R1234yf, and the results are shown in Table 2 below.

[0052] Classification R410 AR1234yf Example of the refrigerant composition of the present invention Molecular weight (g / mol) 72.6 114 114 Boiling point (℃) -51.4-29.5-80 Saturated vapor pressure (@25℃, MPa) 1.7 0.6 1.3 Flammability rating A1 A2 LA 1~A2L Global warming potential (GWP) 208 84 1 Ozone layer depletion potential (ODP) 000

[0053] Looking at the saturated vapor pressure graph at 25°C shown in Fig. 1, the saturated vapor pressure of the refrigerant composition example of the present invention is 1.3 MPa, R410A is 1.7 MPa, and R1234yf is 0.6 MPa. Therefore, it can be seen that the saturated vapor pressure of the example is reduced by about 23% compared to R410A, and the saturated vapor pressure is increased by 216% compared to R1234yf.

[0054] The boiling point of the refrigerant composition example of the present invention is -80°C, that of R410A is -51.4°C, and that of R1234yf is -29.5°C. It can be seen that the boiling point of the example is about 29°C lower than that of R410A and 50°C lower than that of R1234yf.

[0055] As can be seen from the saturated vapor pressure graph illustrated in FIG. 1 and Table 2, the refrigerant composition of the refrigerant composition example of the present invention has properties that can be used as a refrigerant, and is environmentally friendly with a significantly lower global warming potential (GWP) of 1 and an ozone layer depletion potential (ODP) of 0 compared to R410A and R1234yf.

[0056]

[0057] Hereinafter, in order to examine whether the refrigerant composition of the present invention [R1132a (35 wt%) + R13I1 (65 wt%)] can be directly applied as a replacement for the refrigerant composition of the present invention under the conditions of use of equipment in which R410A is used, theoretical cycle characteristic experiments such as condensation and evaporation pressure, compression ratio, discharge temperature, heating heat amount, power consumption, and coefficient of performance (COP) under heating conditions were performed, and the results are as shown in Tables 3 to 5 below.

[0058] Experimental results of the characteristics of the existing refrigerant (R410A) according to the compressor rotation speed under heating conditions (-16℃) Rotation speed (rpm) 1800 2000 2200 2400 2600 2800 3000 Condensing temperature (℃) 21.1 24.3 27.2 30.8 34.2 37.5 4 1.2 Condensing pressure (㎪) 1667 1815 195 42 146 2335 252 42 752 Evaporating temperature (℃) -24.2 - 25.0 - 25.4 - 25.6 - 25.6 - 25.5 - 25.1 Evaporating pressure (㎪) 389 385 378 3733 743 52356Compression ratio 4.24.75.25.76.27.27.7Discharge temperature (℃) 80.786.892.2101.8107.3114.4126.7Heating heat (kW) 3.794.114.404.785.135.475.88Power consumption (kW) 1.631.892.122.552.793.183.72Coefficient of performance (COP) 2.322.182.071.881.881.721.58

[0059] Experimental results of the characteristics of the refrigerant composition of the present invention according to the compressor rotation speed under heating conditions (-20℃) Rotation speed (rpm) 1800 2000 2200 2400 2600 2800 3000 Condensing temperature (℃) 6.9 9.8 12.9 16.1 19.1 21.9 24.9 Condensing pressure (㎪) 195 120 75 220 9 234 5 247 6 260 6 2747 Evaporating temperature (℃) -24.2 - 24.8 - 25.2 - 25.4 - 25.6 - 26.2 - 26.6 Evaporating pressure (㎪) 428 40 9 39 6 38 6 37 7 36 1355Compression ratio 4.65.15.66.16.67.27.7Discharge temperature (℃) 80.483.890.899.0106.4111.7120.1Heating heat (kW) 3.233.523.854.184.504.805.13Power consumption (kW) 1.761.932.212.542.873.173.57Coefficient of performance (COP) 1.841.831.741.651.571.511.44

[0060] Comparison of cycle characteristics experimental results under heating conditions R410A (-16℃) Refrigerant composition of the present invention [R1132a (35wt%) + R13I1 (65wt%)] (-20℃) Condensing temperature (℃) 41.2 24.9 Condensing pressure (㎪) 275 22 747 Evaporating temperature (℃) -25.1 - 26.6 Evaporating pressure (㎪) 356 355 Compression ratio 7.7 7.7 Discharge temperature (℃) 126.7 120.1 Heating heat (㎾) 5.88 5.13 Power consumption (㎾) 3.72 3.57 Coefficient of performance (COP) 1.58 1.44

[0061] The refrigerant composition of the present invention [R1132a (35 wt%) + R13I1 (65 wt%)] has similar condensation pressure and evaporation pressure when compared to R410A.

[0062] In addition, it has a significantly lower global warming potential (GWP) of 1 than R410A (the global warming potential of R410A is 2088), an ozone depletion potential (ODP) of 0, and is environmentally friendly. It also has the advantage of having a lower discharge temperature than R410A.

[0063] Therefore, the refrigerant composition of the present invention can be used as a substitute for R410A, can be applied to existing R410A systems in an environmentally friendly manner, and can be applied to home appliance VRF (Variable Refrigerant Flow).

[0064] Furthermore, by increasing the proportion of R13I1, it can be applied to both internal combustion engine-only cooling vehicles using R1234yf or R134a, as well as hybrid and electric vehicles. In particular, its heating capacity is significantly superior to that of R1234yf, which is used in electric vehicles, potentially increasing their driving range in winter. It also has the advantage of being easy to manufacture as a binary refrigerant mixture.

[0065] For example, the refrigerant composition for an air conditioning device according to the present invention manufactured as described above can be used as a refrigerant in an air conditioning system. The air conditioning system can be applied and used in an automobile, and when used in an automobile, a rubber hose through which the refrigerant flows is made of EPDM rubber (Ethylene Propylene Diene Monomer rubber) or HNBR (Hydrogenated Nitrile Butadiene Rubber). The rubber hose made of EPDM rubber or HNBR reflects the characteristics of the density of the refrigerant and improves the pressure resistance and impermeability of the hose, thereby having the effect of preventing refrigerant leakage.

[0066] The refrigerant composition for an air conditioning device according to the present invention has a heating capacity equivalent to that of R410A and superior to that of R1234yf, a global warming potential (GWP) of 150 or less, and is non-flammable (A1 class) or non-flammable (A2L class) according to ASHRAE standards, and an ozone depletion potential (ODP) of 0, so that it is simple to manufacture, and an air conditioning device for home use that uses R410A can be used as is, so that no separate device is required, and an air conditioning device for automobiles that uses R134a or R1234yf can be replaced with minimal modification, so that costs can be reduced.

Claims

A refrigerant composition for an air conditioning device comprising 1.1,1-difluoroethene (R1132a) and trifluoroiodomethane (R13I1).

2. A refrigerant composition for an air conditioning device, characterized in that in the first paragraph, the 1,1-difluoroethene (R1132a) is 30 to 60 wt% and the trifluoroiodomethane (R13I1) is 40 to 70 wt%.

3. A refrigerant composition for an air conditioning device, characterized in that in the first paragraph, the 1,1-difluoroethene (R1132a) is 35 to 50 wt% and the trifluoroiodomethane (R13I1) is 50 to 65 wt%.

4. A refrigerant composition for an air conditioning device, characterized in that the composition comprises at least one compound selected from the group consisting of difluoromethane, carbon dioxide, tetrafluoropropene, and trans-1,3,3,3-tetrafluoropropene, according to any one of claims 1 to 3.

5. In the fourth paragraph, the composition 30∼59wt% 1,1-difluoroethene, 40∼69wt% trifluoroiodomethane, 1∼30wt% difluoromethane; 30∼59wt% 1,1-difluoroethene, 40∼69wt% trifluoroiodomethane, 1∼10wt% carbon dioxide; 30∼59wt% 1,1-difluoroethene, 40∼69wt% trifluoroiodomethane, 1∼30wt% tetrafluoropropene; or A refrigerant composition for an air conditioning device, characterized in that it comprises 30 to 59 wt% 1,1-difluoroethene, 40 to 69 wt% trifluoroiodomethane, and 1 to 30 wt% trans-1,3,3,3-tetrafluoropropene.

6. A refrigerant composition for an air conditioning device, characterized in that it comprises the composition according to any one of claims 1 to 5, and at least one of propadiene, myrcene, and libonene is added to the mass ratio of refrigerating oil to be 0.001 to 0.1 wt%, respectively, to prevent corrosion of components.

7. A refrigerant composition for an air conditioning device, characterized in that it is used as a refrigerant in an air conditioning system, comprising the composition of any one of claims 1 to 5.

8. A refrigerant composition for an air conditioning device, characterized in that in the 7th paragraph, a rubber hose made of EPDM rubber (Ethylene Propylene Diene Monomer rubber) or HNBR (Hydrogenated nitrile butadiene rubber) is used in the air conditioning system.

Images