Environment-friendly mixed refrigerant, preparation method and application thereof

Abstract

The application provides an environment-friendly mixed refrigerant, a preparation method and application thereof. The environment-friendly mixed refrigerant comprises a first component, a second component and a third component, the first component is 1,1,2-trifluoroethylene, the second component is fluoroethane, and the third component is dimethyl ether, difluoroethane, trans-1,3,3,3-tetrafluoropropene, isobutane, n-butane or 1,1,1,3,3-pentafluoropropene. The environment-friendly mixed refrigerant has good environmental characteristics, the GWP is lower than 150, can significantly improve the operation energy efficiency of a refrigeration system, achieves the purpose of energy saving, and can balance low GWP and high system energy efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerants, in particular to an environmentally friendly mixed refrigerant, a preparation method and application thereof. BACKGROUND

[0002] In recent years, in order to cope with the problem of global warming and frequent occurrence of extreme weather, the international community is accelerating the elimination of HCFC refrigerants and gradually reducing the use of HFCs in order to limit the use of high GWP (Global Warming Potential) refrigerants. The next generation of refrigerants should have the characteristics of zero ODP (Ozone Depletion Potential) and low GWP. The global warming potential of HFCs refrigerants such as R134a, R410A, R404A and R407C widely used in the refrigeration and air conditioning industry is very high (GWP≥1300), so it is urgent to find a good alternative working medium with good environmental performance. SUMMARY

[0003] The main purpose of the present application is to provide an environmentally friendly mixed refrigerant, a preparation method and application thereof, so as to solve the problem that the refrigerant in the prior art cannot balance low GWP and high energy efficiency.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an environmentally friendly mixed refrigerant is provided, comprising a first component, a second component and a third component, the first component is 1,1,2-trifluoroethylene, the second component is fluoroethane, and the third component is dimethyl ether, difluoroethane, trans-1,3,3,3-tetrafluoropropene, isobutane, n-butane or 1,1,1,3,3-pentafluoropropane.

[0005] Further, the environmentally friendly mixed refrigerant comprises 5-85 parts by weight of the first component, 5-65 parts by weight of the second component and 10-75 parts by weight of the third component.

[0006] Further, the third component is dimethyl ether, and the weight ratio of the first component, the second component and the third component is (30-70):(5-20):(25-60), preferably (40-45):(15-20):(35-45).

[0007] Further, the third component is difluoroethane, and the weight ratio of the first component, the second component and the third component is (20-60):(5-15):(35-75), preferably (40-45):(10-15):(35-45).

[0008] Further, the third component is trans-1,3,3,3-tetrafluoropropene, and the weight ratio of the first component, the second component and the third component is (20-65):(5-25):(30-60), preferably (35-40):(10-25):(40-50).

[0009] Further, the third component is isobutane, and the weight ratio of the first component, the second component and the third component is (5-75):(5-45):(20-65), preferably (20-25):(20-45):(35-55).

[0010] Further, the third component is n-butane, and the weight ratio of the first component, the second component and the third component is (5-85):(5-60):(10-55), preferably (10-15):(40-60):(30-45).

[0011] Further, the third component is 1,1,1,3,3-pentafluoropropane, and the weight ratio of the first component, the second component and the third component is (20-85):(5-65):(10-15), preferably (50-85):(5-40):(10-15).

[0012] According to another aspect of the present application, there is provided a method for preparing the environmentally friendly mixed refrigerant as described above, which comprises mixing the first component, the second component and the third component in a liquid phase state at room temperature to obtain the environmentally friendly mixed refrigerant.

[0013] According to another aspect of the present application, there is provided a refrigeration system comprising a refrigerant, wherein the refrigerant comprises the environmentally friendly mixed refrigerant as described above.

[0014] The environmentally friendly mixed refrigerant of the present application is based on the temperature glide characteristics of the non-azeotropic refrigerant, and the characteristics of different refrigerants are balanced, so that the characteristics of the components are well balanced, which can ensure that the refrigerant has good environmental characteristics, and the GWP is less than 150, and can significantly improve the operating energy efficiency of the refrigeration system to achieve the purpose of energy saving. The environmentally friendly mixed refrigerant provided by the present application can balance low GWP and high system energy efficiency, and is a good alternative to high GWP refrigerants in the trend of accelerating the development of refrigerants towards zero ODP and low GWP. DETAILED DESCRIPTION

[0015] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments.

[0016] As described in the background of the present application, the prior art has the problem that the refrigerant cannot be compatible with low GWP and high energy efficiency. In order to solve the above problem, in a typical embodiment of the present application, an environmentally friendly mixed refrigerant is provided, comprising a first component, a second component and a third component, the first component is 1,1,2-trifluoroethylene, the second component is fluoroethane, and the third component is dimethyl ether, difluoroethane, trans-1,3,3,3-tetrafluoropropene, isobutane, n-butane or 1,1,1,3,3-pentafluoropropane.

[0017] The properties of the components of the environmentally friendly mixed refrigerant of the present application can be well complemented, which can ensure that the refrigerant has good environmental properties, GWP≤150, and the environmental performance is significantly improved compared with the commonly used refrigerant R134a. Moreover, the glide temperature of the environmentally friendly mixed refrigerant of the present application is between 10.1-21℃, which can reduce the heat transfer temperature difference, reduce the irreversible loss in the heat transfer process, make the system cycle close to Lorenz cycle, and also significantly reduce the compression ratio of the compressor, achieve the purpose of improving energy efficiency, and the energy efficiency can be improved by 10.2-14.9% compared with the commonly used refrigerant R134a.

[0018] The inventors unexpectedly found during the research that the proportions of the components of the environmentally friendly mixed refrigerant of the present application are different, and the properties of the mixed refrigerant components will be different, including the normal boiling point, glide temperature, volumetric refrigeration capacity, etc. In a preferred embodiment, the environmentally friendly mixed refrigerant comprises 5-85 parts by weight of the first component, 5-65 parts by weight of the second component and 10-75 parts by weight of the third component, which can make the properties of the components of the environmentally friendly mixed refrigerant better complemented, thereby further reducing GWP and improving system energy efficiency.

[0019] For the purpose of matching the types and contents of the third component, thereby further improving the comprehensive performance of the refrigerant, the present application also preferably limits the content of the corresponding third component.

[0020] In a preferred embodiment, the third component is dimethyl ether, and the weight ratio of the first component, the second component and the third component is (30-70):(5-20):(25-60). Within the above component ratio range, the compression ratio of the environmentally friendly mixed refrigerant is smaller, the volumetric refrigeration capacity is larger, the frequency of the compressor operation is lower, and the energy efficiency of the system is higher; and the glide temperature is higher, the refrigerant temperature matches the temperature of the external heat transfer fluid, and the heat transfer can be realized everywhere with small temperature difference, the irreversible loss in the heat transfer process is small, and the EER (energy efficiency ratio) is larger. Preferably, it is (40-45):(15-20):(35-45). Within the above component ratio range, the energy efficiency improvement effect is more obvious, and the comprehensive performance of the environmentally friendly mixed refrigerant is better.

[0021] For similar reasons, in a preferred embodiment, the third component is difluoroethane, and the weight ratio of the first component, the second component and the third component is (20-60):(5-15):(35-75), preferably (40-45):(10-15):(35-45).

[0022] For similar reasons, in a preferred embodiment, the third component is trans-1,3,3,3-tetrafluoropropene, and the weight ratio of the first component, the second component and the third component is (20-65):(5-25):(30-60), preferably (35-40):(10-25):(40-50).

[0023] For similar reasons, in a preferred embodiment, the third component is isobutane, and the weight ratio of the first component, the second component and the third component is (5-75):(5-45):(20-65), preferably (20-25):(20-45):(35-55).

[0024] For similar reasons, in a preferred embodiment, the third component is n-butane, and the weight ratio of the first component, the second component and the third component is (5-85):(5-60):(10-55), preferably (10-15):(40-60):(30-45).

[0025] For similar reasons, in a preferred embodiment, the third component is 1,1,1,3,3-pentafluoropropane, and the weight ratio of the first component, the second component and the third component is (20-85):(5-65):(10-15), preferably (50-85):(5-40):(10-15).

[0026] In another typical embodiment of the present application, there is further provided a preparation method of the environmentally friendly mixed refrigerant as described above, which comprises mixing the first component, the second component and the third component in a liquid phase state at room temperature, thereby obtaining the environmentally friendly mixed refrigerant of the present application, which can achieve low GWP and high energy efficiency, and the preparation method is simple and low in cost.

[0027] In another typical embodiment of the present application, there is further provided a refrigeration system comprising the environmentally friendly mixed refrigerant as described above. The main components of the refrigeration system are a compressor, a condenser, an evaporator and a throttling device (expansion valve), which can be assembled according to a conventional method, and the heat transfer fluid in the system is the refrigerant (i.e. the environmentally friendly mixed refrigerant as described above). The evaporator and the condenser are heat exchangers, and any type of heat exchanger can be used in the present application, preferably a parallel flow heat exchanger, or preferably a heat exchanger with a tendency of counterflow. The above refrigeration system is more matched with the environmentally friendly mixed refrigerant of the present application, and can further achieve high energy efficiency under low GWP.

[0028] Typically but not limitedly, in the environmentally friendly mixed refrigerant, the weight fraction of the first component is 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts or any range value composed of any two of the above values; the weight fraction of the second component is 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts or any range value composed of any two of the above values; the weight fraction of the third component is 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or any range value composed of any two of the above values.

[0029] Typically but not limitedly, in the environmentally friendly mixed refrigerant, the third component is dimethyl ether, at this time, the weight fraction of the first component is 30-70 parts (such as 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts or any range value composed of any two of the above values), the weight fraction of the second component is 5 parts, 10 parts, 15 parts, 20 parts or any range value composed of any two of the above values, and the weight fraction of the third component is 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or any range value composed of any two of the above values.

[0030] Typically but not limitedly, in the environmentally friendly mixed refrigerant, the third component is difluoroethane, at this time, the weight fraction of the first component is 20-60 parts (such as 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or any range value composed of any two of the above values), the weight fraction of the second component is 5 parts, 10 parts, 15 parts or any range value composed of any two of the above values, and the weight fraction of the third component is 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or any range value composed of any two of the above values.

[0031] Typically but not limitedly, in the environmentally friendly mixed refrigerant, the third component is trans-1,3,3,3-tetrafluoropropene, at this time, the weight fraction of the first component is 20-65 parts (such as 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts or any range value composed of any two of the above values), the weight fraction of the second component is 5 parts, 10 parts, 15 parts, 20 parts, 25 parts or any range value composed of any two of the above values, and the weight fraction of the third component is 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or any range value composed of any two of the above values.

[0032] Typically but not limitedly, in the environmentally friendly mixed refrigerant, the third component is isobutane, at this time, the weight fraction of the first component is 5-75 parts (such as 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or any range value composed of any two of the above values), the weight fraction of the second component is 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or any range value composed of any two of the above values, and the weight fraction of the third component is 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts or any range value composed of any two of the above values.

[0033] Typically but not limitedly, in the environmentally friendly mixed refrigerant, the third component is n-butane, at this time, the weight fraction of the first component is 5-85 parts (such as 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts or any range value composed of any two of the above values), the weight fraction of the second component is 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or any range value composed of any two of the above values, and the weight fraction of the third component is 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or any range value composed of any two of the above values.

[0034] Typically but not limitedly, in the environmentally friendly mixed refrigerant, the third component is 1,1,1,3,3-pentafluoropropane, at this time, the weight fraction of the first component is 20-85 parts (such as 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts or any range value composed of any two of the above values), the weight fraction of the second component is 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts or any range value composed of any two of the above values, and the weight fraction of the third component is 10 parts, 12 parts, 14 parts, 15 parts or any range value composed of any two of the above values.

[0035] The application will be further described in conjunction with specific examples, which cannot be understood as limiting the scope of the application claimed.

[0036] It should be noted that there may be slight differences in different versions of GWP, and the GWP shown in the present application is mainly derived from IPCC AR6 (2021), and other parameters are from REFPROP 10.0 software.

[0037] The basic parameters of the refrigerant components used in the following examples and comparative examples are shown in Table 1.

[0038] Table 1

[0039]

[0040] Example 1

[0041] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and dimethyl ether (RE170) were physically uniformly mixed in a weight ratio of 30:10:60 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0042] Example 2

[0043] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and dimethyl ether (RE170) were physically uniformly mixed in a weight ratio of 40:15:45 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0044] Example 3

[0045] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and dimethyl ether (RE170) were physically uniformly mixed in a weight ratio of 45:20:35 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0046] Example 4

[0047] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and dimethyl ether (RE170) were physically uniformly mixed in a weight ratio of 70:5:25 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0048] Example 5

[0049] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and difluoroethane (R152a) were physically uniformly mixed in a weight ratio of 20:5:75 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0050] Example 6

[0051] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and difluoroethane (R152a) are physically uniformly mixed in a weight ratio of 40:15:45 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0052] Example 7

[0053] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and difluoroethane (R152a) are physically uniformly mixed in a weight ratio of 45:10:45 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0054] Example 8

[0055] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and difluoroethane (R152a) are physically uniformly mixed in a weight ratio of 60:5:35 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0056] Example 9

[0057] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) are physically uniformly mixed in a weight ratio of 20:20:60 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0058] Example 10

[0059] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) are physically uniformly mixed in a weight ratio of 35:25:40 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0060] Example 11

[0061] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) are physically uniformly mixed in a weight ratio of 40:10:50 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0062] Example 12

[0063] 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) are physically uniformly mixed in a weight ratio of 65:5:30 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0064] Example 13

[0065] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and isobutane (R600a) were physically uniformly mixed in a weight ratio of 5:30:65 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0066] Example 14

[0067] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and isobutane (R600a) were physically uniformly mixed in a weight ratio of 20:45:35 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0068] Example 15

[0069] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and isobutane (R600a) were physically uniformly mixed in a weight ratio of 25:20:55 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0070] Example 16

[0071] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and isobutane (R600a) were physically uniformly mixed in a weight ratio of 75:5:20 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0072] Example 17

[0073] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and n-butane (R600) were physically uniformly mixed in a weight ratio of 5:40:55 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0074] Example 18

[0075] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and n-butane (R600) were physically uniformly mixed in a weight ratio of 10:60:30 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0076] Example 19

[0077] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and n-butane (R600) were physically uniformly mixed in a weight ratio of 15:40:45 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0078] Example 20

[0079] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and n-butane (R600) were physically uniformly mixed in a weight ratio of 85:5:10 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0080] Example 21

[0081] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and 1,1,1,3,3-pentafluoropropane (R245fa) were physically uniformly mixed in a weight ratio of 20:65:15 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0082] Example 22

[0083] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and 1,1,1,3,3-pentafluoropropane (R245fa) were physically uniformly mixed in a weight ratio of 50:40:10 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0084] Example 23

[0085] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and 1,1,1,3,3-pentafluoropropane (R245fa) were physically uniformly mixed in a weight ratio of 85:5:10 in a liquid phase at room temperature to obtain an environmentally friendly mixed refrigerant.

[0086] Comparative Example 1

[0087] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and dimethyl ether (RE170) were physically uniformly mixed in a weight ratio of 5:5:90 in a liquid phase at room temperature to obtain a mixed refrigerant.

[0088] Comparative Example 2

[0089] Three components of 1,1,2-trifluoroethylene (R1123), fluoroethane (R161) and difluoroethane (R152a) were physically uniformly mixed in a weight ratio of 5:5:90 in a liquid phase at room temperature to obtain a mixed refrigerant.

[0090] Comparative Example 3

[0091] A mixed refrigerant was obtained by physically uniformly mixing 1,1,2-trifluoroethylene (R1123), fluoromethane (R161), and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) at a weight ratio of 5:15:80 in a liquid phase at normal temperature.

[0092] Comparative Example 4

[0093] A mixed refrigerant was obtained by physically uniformly mixing 1,1,2-trifluoroethylene (R1123), fluoromethane (R161), and isobutane (R600a) at a weight ratio of 90:5:5 in a liquid phase at normal temperature.

[0094] Comparative Example 5

[0095] A mixed refrigerant was obtained by physically uniformly mixing 1,1,2-trifluoroethylene (R1123), fluoromethane (R161), and n-butane (R600) at a weight ratio of 5:20:75 in a liquid phase at normal temperature.

[0096] Comparative Example 6

[0097] A mixed refrigerant was obtained by physically uniformly mixing 1,1,2-trifluoroethylene (R1123), fluoromethane (R161), and 1,1,1,3,3-pentafluoropropane (R245fa) at a weight ratio of 10:85:5 in a liquid phase at normal temperature.

[0098] Comparative Example 7

[0099] A mixed refrigerant was obtained by physically uniformly mixing 1,1,2-trifluoroethylene (R1123), fluoromethane (R161), and 2,3,3,3-tetrafluoropropene (R1234yf) at a weight ratio of 5:45:50 in a liquid phase at normal temperature.

[0100] Comparative Example 8

[0101] A mixed refrigerant was obtained by physically uniformly mixing 1,1,2-trifluoroethylene (R1123), trans-1,3,3,3-tetrafluoropropene (R1234ze(E)), and n-butane (R600) at a weight ratio of 10:35:55 in a liquid phase at normal temperature.

[0102] Comparative Example 9

[0103] A mixed refrigerant was obtained by physically uniformly mixing propane (R290), fluoromethane (R161), and dimethylether (RE170) at a weight ratio of 65:5:30 in a liquid phase at normal temperature.

[0104] The refrigerants of the above examples and comparative examples are applied to the refrigeration system of the present application, and compared with the currently used R134a (1,1,1,2-tetrafluoroethane) refrigerant. The basic parameters such as molecular weight, normal boiling point and environmental performance are compared, and the results are shown in Table 2.

[0105] The design conditions of the refrigeration system are as follows: the inlet and outlet temperatures of the evaporator side heat exchange fluid are 300.15 K and 287.65 K respectively, the inlet and outlet temperatures of the condenser side heat exchange fluid are 287.65 K and 314.15 K respectively, the logarithmic mean temperature differences of the evaporator and the condenser are 11 K and 10 K respectively, the refrigerant at the outlet of the evaporator is in a superheated state with a superheat of 1 K, the refrigerant at the outlet of the condenser is in a subcooled state with an outlet temperature of 291.15 K, and the adiabatic efficiency of the compressor is 0.7. The system parameters and energy efficiency of the above examples and comparative examples and R134a are compared, and the results are shown in Table 3.

[0106] Table 2

[0107]

[0108]

[0109] (*Note: The glide temperature is the difference between the dew point temperature and the bubble point temperature at the working pressure)

[0110] As shown in Table 2, the environmental performance of the environmentally friendly mixed refrigerant provided by the present application is better than that of R134a, and the GWP of all examples is ≤ 150; the glide temperature is between 10.1-21℃, and the matching of the glide temperature and the temperature difference between the inlet and outlet of the heat exchange medium can realize small temperature difference heat exchange at each place of the heat exchanger, reduce the irreversible loss in the heat exchange process, and achieve the purpose of improving the energy efficiency. In the comparative examples 1-6, the weight ratio of each component is not within the range provided by the present application, and in the comparative examples 7-9, the refrigerant composition of the present application is not used, and the glide temperature of the obtained refrigerant is too large or too small, which is not matched with the system.

[0111] Table 3

[0112]

[0113]

[0114]

[0115] As shown in Table 3, the thermal performance of the environment-friendly mixed refrigerant provided by each embodiment of the present application is superior to that of R134a, the volumetric refrigeration capacity is much higher than that of R134a, the system filling amount can be reduced, the system volume can be reduced, and the compression ratio of the compressor can be significantly reduced. By using the mixed refrigerant in each embodiment of the present application and cooperating with the corresponding flow path configuration, the energy efficiency of the mixed refrigerant system can be improved by 10.2-14.9% compared with R134a. The weight ratio of each component in Comparative Examples 1-6 is not within the range provided by the present application, and Comparative Examples 7-9 do not use the refrigerant combination of the present application, and the energy efficiency improvement of the system is lower than that of each embodiment of the present application.

[0116] As can be seen from the above, under the composition of the present application, the characteristics of each component of the environment-friendly mixed refrigerant of the present application and the heat transfer of the fluid inside and outside the heat exchanger can be well balanced, which can ensure that the refrigerant has good environmental characteristics and can effectively improve the system energy efficiency. The environment-friendly mixed refrigerant provided by the present application can take into account low GWP and high system energy efficiency, and become a good alternative scheme for high-GWP refrigerants in the trend of accelerating the development of refrigerants towards zero ODP and low GWP.

[0117] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An environmentally friendly mixed refrigerant, characterized in that, The product comprises, by weight, 5 to 85 parts of a first component, 5 to 65 parts of a second component, and 10 to 75 parts of a third component, wherein the first component is 1,1,2-trifluoroethylene, the second component is fluoroethane, and the third component is difluoroethane, wherein the difluoroethane is R152a.

2. The environmentally friendly mixed refrigerant according to claim 1, characterized in that, The weight ratio of the first component, the second component and the third component is (20~60):(5~15):(35~75).

3. The environmentally friendly mixed refrigerant according to claim 2, characterized in that, The weight ratio of the first component, the second component and the third component is (40~45):(10~15):(35~45).

4. The method for preparing the environmentally friendly mixed refrigerant according to any one of claims 1 to 3, characterized in that, The first component, the second component, and the third component are mixed in a liquid phase at room temperature to obtain the environmentally friendly mixed refrigerant.

5. A refrigeration system comprising a refrigerant, characterized in that, The refrigerant includes the environmentally friendly mixed refrigerant as described in any one of claims 1 to 3.

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