CN116179161A - Environment-friendly energy-saving mixed refrigerant and preparation method and application thereof - Google Patents

Environment-friendly energy-saving mixed refrigerant and preparation method and application thereof Download PDF

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CN116179161A
CN116179161A CN202210653298.0A CN202210653298A CN116179161A CN 116179161 A CN116179161 A CN 116179161A CN 202210653298 A CN202210653298 A CN 202210653298A CN 116179161 A CN116179161 A CN 116179161A
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mixed refrigerant
trifluoroethylene
difluoromethane
component
environment
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梁祥飞
皇甫启捷
吕如兵
徐璐
黄泽清
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
    • C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
    • C09K5/044—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds
    • C09K5/045—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds containing only fluorine as halogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
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    • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
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    • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
    • C09K2205/34—The mixture being non-azeotropic
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    • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
    • C09K2205/40—Replacement mixtures
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract

The invention relates to the technical field of refrigeration, and discloses an environment-friendly energy-saving mixed refrigerant, and a preparation method and application thereof. The mixed refrigerant comprises a first component, a second component and a third component; the first component is 1, 2-trifluoroethylene, the second component is difluoromethane, the third component is propylene, propane, 2, 3-tetrafluoropropene, dimethyl ether trans 1, 3-tetrafluoropropene, isobutane, butane or 1, 3-pentafluoropropane. The invention provides an environment-friendly energy-saving mixed refrigerant with low GWP and high system energy efficiency based on the temperature sliding characteristic of non-azeotropic refrigerants by weighing the characteristics of different refrigerants, the mixed refrigerant has good environmental performance, the GWP is lower than 140, and the GWP of most of the mixed refrigerant is lower than 120, and meanwhile, the mixed refrigerant can remarkably improve the operation energy efficiency of refrigeration equipment and achieve the purpose of energy saving.

Description

Environment-friendly energy-saving mixed refrigerant and preparation method and application thereof
The application is divided application with the application number 202111437306.X and the creative name of 'an environment-friendly and energy-saving mixed refrigerant, a preparation method and application' of the environment-friendly and energy-saving mixed refrigerant, wherein the application number is 2021, 11 and 29.
Technical Field
The application relates to the technical field of refrigeration, in particular to an environment-friendly and energy-saving mixed refrigerant and a preparation method and application thereof.
Background
In recent years, in order to cope with the global warming and the frequent occurrence of extreme weather, a series of policies have been internationally established to accelerate the elimination of HCFCs refrigerants and to gradually reduce the usage of HFCs to limit the use of high GWP refrigerants. According to the Montreal protocol and the Kyoto protocol, the next generation of refrigerants should have the characteristics of zero ODP and low GWP.
The heat potential values (GWP is more than or equal to 1300) of the refrigerants such as HFCs refrigerants R134A, R410A, R A, R407C and the like which are widely applied to the refrigeration and air-conditioning industry at present are very high, so that a substitute working medium with excellent environmental protection performance is urgently needed to be searched. The refrigerant meets the environmental protection property and simultaneously meets the energy conservation property of the refrigerating system, so that the energy efficiency or the capacity of the system is improved. Therefore, there is an urgent need to develop a refrigerant having both low GWP and high system energy efficiency to replace the high GWP refrigerant used.
At present, no alternative scheme capable of meeting the requirements of environmental protection and energy conservation at the same time can be found in pure working media. In view of this, the mixed refrigerant which can balance the physical properties of each pure working medium becomes a hot spot for researching environment-friendly refrigerants.
Disclosure of Invention
In view of the above, the present invention aims to provide an environment-friendly and energy-saving mixed refrigerant and a preparation method thereof, so that the mixed refrigerant has both low GWP and high system energy efficiency;
another object of the present invention is to provide an environment-friendly and energy-saving type mixed refrigerant and a method for preparing the same, which can reduce a compression ratio of a compressor in a refrigerating apparatus and has a high relative capacity refrigerating capacity;
another object of the present invention is to provide an application of the above-mentioned environment-friendly and energy-saving mixed refrigerant in preparing a refrigeration device, and to provide a refrigeration device using the mixed refrigerant as a heat transfer fluid.
In order to solve the above technical problems/achieve the above objects or at least partially solve the above technical problems/achieve the above objects, the present invention provides an environment-friendly and energy-saving mixed refrigerant comprising a first component, a second component, and a third component; wherein the first component is 1, 2-trifluoroethylene (R1123), the second component is difluoromethane (R32), the third component is propylene (R1270), propane (R290), 2, 3-tetrafluoropropene (R1234 yf), dimethyl ether (DME) trans 1, 3-tetrafluoropropene (R1234 ze (E)), isobutane (R600 a), butane (R600) or 1, 3-pentafluoropropane (R245 fa).
The invention provides an environment-friendly energy-saving mixed refrigerant with low GWP and high system energy efficiency by weighing the characteristics of different refrigerants based on the temperature sliding characteristic of non-azeotropic refrigerants. Preferably, the mass percentage of the first component, the second component and the third component is 10-85% of the first component, 5-15% of the second component and 10-85% of the third component.
Further, the mixed refrigerant is selected from any one of the following compositions:
(1) 10-45% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 50-85% of propylene;
(2) 15-55% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 40-70% of propane;
(3) 10-50% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 40-75% of 2, 3-tetrafluoropropene;
(4) 25-80% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 15-60% of dimethyl ether;
(5) 10-70% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 20-75% of trans-1, 3-tetrafluoropropene;
(6) 65-75% of 1,2 trifluoroethylene, 10-15% of difluoromethane and 15-25% of isobutane;
(7) 75-85% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 10-15% of butane;
(8) 85% 1,2 trifluoroethylene, 5% difluoromethane and 10% 1, 3-pentafluoropropane.
Still further, in the composition of (1), the 1,2 trifluoroethylene may be selected to be 10% or 40% by mass, the difluoromethane may be selected to be 5%, 10% or 15% by mass, and the propylene may be selected to be 50%, 75% or 85% by mass;
in the composition of (2), the 1,2 trifluoroethylene is selected to be 15%, 20% or 55% by mass, the difluoromethane is selected to be 5% or 15% by mass, and the propane is selected to be 40%, 65% or 70% by mass;
in the composition of (3), the mass percentage of the 1,2 trifluoroethylene may be selected to be 10%, 30% or 50%, the mass percentage of the difluoromethane may be selected to be 10% or 15%, and the mass percentage of the 2, 3-tetrafluoropropene may be selected to be 40%, 55% or 75%;
in the composition of (4), the 1,2 trifluoroethylene may be selected to be 25%, 40% or 80% by mass, the difluoromethane may be selected to be 5% or 15% by mass, and the dimethyl ether may be selected to be 15%, 45% or 60% by mass;
in the composition of (5), the 1,2 trifluoroethylene may be selected to be 10%, 40% or 70% by mass, the difluoromethane may be selected to be 10% or 15% by mass, and the trans 1, 3-tetrafluoropropene may be selected to be 20%, 45% or 75% by mass;
in the composition of (6), the 1,2 trifluoroethylene is selected to be 65%, 70%, or 75% by mass, the difluoromethane is selected to be 10% by mass, and the isobutane is selected to be 15%, 20%, or 25% by mass;
in the composition of (7), the 1,2 trifluoroethylene may be selected to be 75% or 85% by mass, the difluoromethane may be selected to be 5% or 10% by mass, and the butane may be selected to be 10% or 15% by mass.
Comparing the existing R134a refrigerant with the mixed refrigerant of the invention applied to a refrigerating device, wherein the GWP of the mixed refrigerant of the invention is less than 140, the GWP of most mixed refrigerants is below 120, and the GWP of the R314a refrigerant is as high as 1530; meanwhile, the mass ratio of each component is different from the invention, and the type of each component refrigerant is different from the comparative example of the invention, compared with the mixed refrigerant of the invention, the temperature sliding is larger or smaller, the irreversible loss in the heat exchange process can not be reduced efficiently, and the aim of improving the energy efficiency is achieved.
The invention also compares the R134a, R410A and the refrigerants of each comparative example through simulation calculation, and the results show that the thermal performance of the mixed refrigerant provided by the invention is superior to that of the R134a, the volume refrigerating capacity is higher than that of the R134a, and the compression ratio of the compressor can be obviously reduced. The mixed refrigerant of the invention is adopted as a refrigerant, so that the energy efficiency of the refrigerating device is improved by 10 to 17 percent compared with R134a, 8.7 to 15.7 percent compared with R410A, and the EER lifting amplitude of other comparative examples is lower than that of the mixed refrigerant of the invention.
Based on the excellent technical effects, the invention provides application of the mixed refrigerant in preparing a refrigeration device. Preferably, the refrigerating device is an air conditioner.
According to the application, the invention provides a refrigeration device, which takes the mixed refrigerant as heat transfer fluid. Meanwhile, the refrigerating device can also comprise one or more than two of main components such as a compressor, a heat exchanger, an expansion device and the like. Wherein the heat exchanger comprises an evaporator and a condenser, any type of heat exchanger may be used in the present invention, preferably a counter-flow heat exchanger having a counter-flow tendency.
In addition, the invention also provides a preparation method of the mixed refrigerant, which is characterized in that the first component, the second component and the third component are physically and uniformly mixed in a room temperature liquid phase state according to the mass percentage of each component, so as to obtain the mixed refrigerant. In general, the room temperature is between 20 and 30 ℃, and the uniform mixing is realized by a stirring device, and the time is generally 1 to 5 hours according to the actual situation.
According to the technical scheme, based on the temperature sliding characteristic of the non-azeotropic refrigerant, the invention provides the environment-friendly and energy-saving mixed refrigerant with low GWP and high system energy efficiency by weighing the characteristics of different refrigerants, the mixed refrigerant has good environment performance, the GWP is lower than 140, the GWP of most of the mixed refrigerants is lower than 120, and meanwhile, the mixed refrigerant can remarkably improve the operation energy efficiency of refrigeration equipment and achieve the purpose of energy saving.
Detailed Description
The invention discloses an environment-friendly energy-saving mixed refrigerant, a preparation method and application thereof, and a person skilled in the art can refer to the content of the environment-friendly energy-saving mixed refrigerant and properly improve the technological parameters. It is expressly noted that all such similar substitutions and modifications will be apparent to those skilled in the art, and are deemed to be included in the present invention. While the products, processes and applications of the present invention have been described in terms of preferred embodiments, it will be apparent to those skilled in the relevant art that the invention can be practiced and practiced with modification and alteration and combination of the products, processes and applications described herein without departing from the spirit and scope of the invention. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
It should be noted that in this document, relational terms such as "first" and "second," "step 1" and "step 2," and "(1)" and "(2)" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The invention improves the energy efficiency of the mixed refrigerant (increases the indexes such as EER lifting amplitude and the like) on the premise of realizing low GWP by weighing the characteristics of different refrigerants based on the temperature sliding characteristic of the non-azeotropic refrigerant; the non-azeotropic working medium is adopted, environmental protection is only one of the consideration, and more importantly, how to work according to or to enable the system circulation to approach Lorentz (Lorenz) circulation characteristics can reduce the heat transfer temperature difference between the condenser and the evaporator and between the high-temperature heat source and the low-temperature heat source, so that the irreversible loss is reduced, the purpose of energy conservation is achieved, and more creative labor is needed compared with the former.
In order to balance the physical properties of the refrigerant of each component and achieve the aim of improving the energy efficiency rather than achieving the equivalent energy efficiency of the current refrigerant under the premise of reducing the environmental protection requirement of GWP, the invention provides a mixed refrigerant which comprises three components, wherein the first component is 1, 2-trifluoroethylene (R1123), the second component is difluoromethane (R32), and the third component is one of the following components:
propylene (R1270), propane (R290), 2, 3-tetrafluoropropene (R1234 yf), dimethyl ether (DME), a trans 1, 3-tetrafluoropropene (R1234 ze (E)), isobutane (R600 a), butane (R600) and 1, 3-pentafluoropropane (R245 fa).
In comparison with the existing R134a refrigerant, the mixed refrigerant of the present invention exhibits excellent properties in various aspects; in addition, in order to further propose the mixed refrigerant meeting the expected aim, the invention also provides a comparative example of the working medium components and the mass ratio which are not in the scope of the invention, thereby determining the composition of the mixed refrigerant capable of achieving the two effects at the same time. In a preferred implementation, the mixed refrigerant has a composition of one of:
(1) 10-45% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 50-85% of propylene;
(2) 15-55% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 40-70% of propane;
(3) 10-50% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 40-75% of 2, 3-tetrafluoropropene;
(4) 25-80% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 15-60% of dimethyl ether;
(5) 10-70% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 20-75% of trans-1, 3-tetrafluoropropene;
(6) 65-75% of 1,2 trifluoroethylene, 10-15% of difluoromethane and 15-25% of isobutane;
(7) 75-85% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 10-15% of butane;
(8) 85% 1,2 trifluoroethylene, 5% difluoromethane and 10% 1, 3-pentafluoropropane.
In a more specific implementation, the present invention provides the following detailed mixed refrigerants of table 1:
TABLE 1
Figure BDA0003686731840000051
The basic parameters of each working substance in the mixed refrigerant are shown in Table 2:
TABLE 2
Figure BDA0003686731840000052
Figure BDA0003686731840000061
Note that: the difference exists between different versions of GWP, the GWP shown in the invention is mainly derived from IPCC AR6 (2021), and other parameters are given by REFPROP 10.0;
compared with the mixed refrigerants in table 1, the comparative examples and the single refrigerant commonly used at present, the mixed refrigerant provided by the invention has better environmental protection performance than R134a, the GWP of all the mixed refrigerants is less than 140, and the GWP of most of the examples is less than 120; the sliding temperature of the mixed refrigerant can be utilized to reduce irreversible loss in the heat exchange process, so that the aim of improving energy efficiency is fulfilled. The components and their mass ratios in the comparative examples are not within the ranges provided by the invention, and the resulting refrigerant has a temperature glide that is greater or less than that of the examples under the same components.
Comparing R134a, R410A and the mixed refrigerant described above with the mixed refrigerant in the comparative example by simulation calculation, the results show that the mixed refrigerant of the present invention is improved in energy efficiency, not to an extent comparable to each control.
In each of the comparative experiments provided by the present invention, unless otherwise specified, other experimental conditions, materials, etc. were kept consistent to allow for comparability, except for the differences noted in each group.
Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict. The invention further provides an environment-friendly energy-saving mixed refrigerant, a preparation method and application thereof, wherein the proportion of each working medium component is 100% by mass, and the sum of the mass percentages of each working medium substance of each mixed refrigerant is 100%.
Example 1: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and propylene (R1270) are mixed evenly and physically at the normal temperature liquid phase according to the mass percentage of 40:10:50, thus obtaining the environment-friendly energy-saving mixed refrigerant.
Example 2: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and propylene (R1270) are physically and uniformly mixed according to the mass percentage of 10:15:75 at the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 3: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and propylene (R1270) are physically and uniformly mixed according to the mass percentage of 10:5:85 under the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 4: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and propane (R290) are physically and uniformly mixed according to the mass percentage of 55:5:40 at the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 5: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and propane (R290) are physically and uniformly mixed according to the mass percentage of 20:15:65 at the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 6: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and propane (R290) are physically and uniformly mixed according to the mass percentage of 15:15:70 at the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 7: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and 2, 3-tetrafluoropropene (R1234 yf) are physically and uniformly mixed according to the mass percentage of 50:10:40 at normal temperature under liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 8: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and 2, 3-tetrafluoropropene (R1234 yf) are physically and uniformly mixed according to the mass percentage of 30:15:55 at the normal temperature under the liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 9: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and 2, 3-tetrafluoropropene (R1234 yf) are physically and uniformly mixed according to the mass percentage of 10:15:75 under the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 10: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and dimethyl ether (RE 170) are physically and uniformly mixed according to the mass percentage of 80:5:15 under the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 11: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and dimethyl ether (RE 170) are mixed evenly and physically at the normal temperature liquid phase according to the mass percentage of 40:15:45, thus obtaining the environment-friendly energy-saving mixed refrigerant.
Example 12: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and dimethyl ether (RE 170) are physically and uniformly mixed according to the mass percentage of 25:15:60 at the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 13: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and trans-1, 3-tetrafluoropropene (R1234 ze (E)) are physically and uniformly mixed according to the mass percentage of 70:10:20 at normal temperature under liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 14: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and trans-1, 3-tetrafluoropropene (R1234 ze (E)) are physically and uniformly mixed according to the mass percentage of 40:15:45 at normal temperature under liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 15: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and trans-1, 3-tetrafluoropropene (R1234 ze (E)) are physically and uniformly mixed according to the mass percentage of 10:15:75 at normal temperature under liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 16: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and isobutane (R600 a) are mixed evenly and physically at the normal temperature liquid phase according to the mass percentage of 75:10:15, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 17: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and isobutane (R600 a) are physically and uniformly mixed according to the mass percentage of 70:10:20 at the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 18: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and isobutane (R600 a) are physically and uniformly mixed according to the mass percentage of 65:10:25 at the normal temperature liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Example 19: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and butane (R600) are physically and uniformly mixed according to the mass percentage of 85:5:10 at the normal temperature and the liquid phase to obtain the environment-friendly energy-saving mixed refrigerant
Example 20: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and butane (R600) are mixed evenly and physically at the normal temperature liquid phase according to the mass percentage of 75:10:15, thus obtaining the environment-friendly energy-saving mixed refrigerant.
Example 21: the mixed refrigerant of the invention
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and 1, 3-pentafluoropropane (R245 fa) are physically and uniformly mixed according to the mass percentage of 85:5:10 at normal temperature under liquid phase, so as to obtain the environment-friendly energy-saving mixed refrigerant.
Comparative example 1: control mixed refrigerant
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and propane (R290) are physically and uniformly mixed according to the mass percentage of 60:20:20 under the normal temperature liquid phase, so as to obtain a contrast mixed refrigerant.
Comparative example 2: control mixed refrigerant
The preparation method comprises the steps of physically and uniformly mixing three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and 2, 3-tetrafluoropropene (R1234 yf) according to a mass percentage of 5:5:90 at normal temperature under a liquid phase to obtain a control mixed refrigerant.
Comparative example 3: control mixed refrigerant
The three components of 1, 2-trifluoroethylene (R1123), difluoromethane (R32) and trifluoroiodomethane (CF 3I) are physically and uniformly mixed according to the mass percentage of 10:10:80 at the normal temperature under the liquid phase to obtain a control mixed refrigerant.
Comparative example 4: control mixed refrigerant
The three components of 1, 2-trifluoroethylene (R1123), pentafluoroethane (R125) and propylene (R1270) are physically and uniformly mixed according to the mass percentage of 10:5:85 at normal temperature under liquid phase, so as to obtain a control mixed refrigerant.
Comparative example 5: control mixed refrigerant
The butane (R600), pentafluoroethane (R125) and propylene (R1270) are physically and uniformly mixed according to the mass percentage of 70:10:20 at normal temperature liquid phase to obtain a control mixed refrigerant.
Example 22: basic performance contrast of refrigerant
The refrigerating device is composed of a compressor, a condenser, an evaporator, an expansion device and the like as main components, and the heat transfer fluid in the system is the refrigerant in the embodiment or the comparative example. The evaporator and condenser are heat exchangers, which have a tendency to reverse flow.
The mixed refrigerants of the above examples and comparative examples were applied to the same refrigeration system and compared with the R134a refrigerant used in the prior art. Table 3 compares the basic parameters of the molecular weight, normal boiling point, environmental properties, etc. of the above examples, comparative examples and R134 a.
TABLE 3 Table 3
Figure BDA0003686731840000091
Figure BDA0003686731840000101
Note that: the slip temperature is the difference between the dew point temperature and the bubble point temperature at the operating pressure;
as can be seen from Table 3, the mixed refrigerant provided by the present invention has environmental properties superior to R134a, and GWP of all examples is less than or equal to 140; the sliding temperature of the mixed refrigerant is between 7.4 and 18.2 ℃, and the small temperature difference heat exchange at each part of the heat exchanger can be realized by utilizing the matching of the sliding temperature and the temperature difference between the inlet and the outlet of the heat exchange medium, so that the irreversible loss in the heat exchange process is reduced, and the aim of improving the energy efficiency is fulfilled. The mass ratio of each component in comparative examples 1 to 3 was not in the range provided by the invention, and the temperature glide of the obtained refrigerant was large or small. In comparative examples 4-5, the type of working medium in the mixed refrigerant was changed, the GWP value was higher, and the energy efficiency improvement of the system was lower than that of the present invention (see the following table).
The mixed refrigerants of R134a, R410A and the above examples and comparative examples were compared by a simulation calculation, which is: the inlet and outlet temperatures of the evaporator side heat exchange fluid were 27 ℃ and 14.5 ℃ respectively, the inlet and outlet temperatures of the condenser side heat exchange fluid were 14.5 ℃ and 41 ℃ respectively, the logarithmic average Wen Chafen of the evaporator and condenser was 11 ℃ and 10 ℃ respectively, the refrigerant at the outlet of the evaporator was in a superheated state, the degree of superheat was 1 ℃, the refrigerant at the outlet of the condenser was in a supercooled state, the outlet temperature was 18 ℃, and the adiabatic efficiency of the compressor was 0.7.
And under the nominal working condition of the dehumidifier, performing system simulation calculation, and comparing the results with the table 4.
TABLE 4 Table 4
Figure BDA0003686731840000102
Figure BDA0003686731840000111
As can be seen from Table 4, the thermal performance of the mixed working medium provided by the invention is superior to R134a, and the volume refrigerating capacity is far higher than that of R134a, so that the compressor with smaller discharge capacity can be selected under the same requirement, and the effect of reducing the volume of the compressor is achieved. The volume refrigeration capacity of R410A is 2.28 times that of R134a, and the solvent refrigeration capacity of the embodiments of the present invention has a higher level due to the physical property differences of the components in the refrigerant composition, and the EER of all embodiments is significantly higher than R410, which is one of the expected technical effects expected to be achieved by the present invention, although the volume refrigeration capacity of some embodiments is higher than R410A and the volume refrigeration capacity of some embodiments is lower than or close to R410A. The mixed working medium can obviously reduce the compression ratio of the compressor, wherein the compression ratio in the embodiment is 2.10-2.32, compared with R134a, the compression ratio is obviously reduced, compared with R410, only the embodiment 15 is slightly higher by 0.01, and the other embodiments are obviously reduced. The mixed refrigerant in the embodiment of the invention can improve the energy efficiency of the refrigeration system by 10.2-16.2% compared with R134a and 8.9-14.9% compared with R410A. The EER increases in comparative examples 1-5 are less than in examples. The results show that the characteristics among the substances and the heat transfer conditions of the fluid inside and outside the heat exchanger are well balanced only when the mass ratio and the composition of the substances are adopted, so that the refrigerant has good environmental characteristics, the energy efficiency of the system can be effectively improved, and the refrigerant becomes a good alternative scheme of the high GWP refrigerant.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. An environment-friendly energy-saving mixed refrigerant is characterized by comprising a first component, a second component and a third component; wherein the first component is 1, 2-trifluoroethylene, and the mass percentage is 10-85%; the second component is difluoromethane, the mass percentage is 5-15%; the third component is isobutane, butane or 1, 3-pentafluoropropane, and the mass percentage is 10-85%.
2. The mixed refrigerant according to claim 1, wherein the mixed refrigerant is selected from any one of the following compositions:
(1) 65-75% of 1,2 trifluoroethylene, 10-15% of difluoromethane and 15-25% of isobutane;
(2) 75-85% of 1,2 trifluoroethylene, 5-15% of difluoromethane and 10-15% of butane;
(3) 85% 1,2 trifluoroethylene, 5% difluoromethane and 10% 1, 3-pentafluoropropane.
3. The mixed refrigerant according to claim 2, wherein the mixed refrigerant is selected from any one of the following compositions:
(1) 75% 1,2 trifluoroethylene, 10% difluoromethane and 15% isobutane;
(2) 70% 1,2 trifluoroethylene, 10% difluoromethane and 20% isobutane;
(3) 65% 1,2 trifluoroethylene, 10% difluoromethane and 25% isobutane;
(4) 85% 1,2 trifluoroethylene, 5% difluoromethane and 10% butane;
(5) 75% 1,2 trifluoroethylene, 10% difluoromethane and 15% butane;
(6) 85% 1,2 trifluoroethylene, 5% difluoromethane and 10% 1, 3-pentafluoropropane.
4. Use of a mixed refrigerant according to any one of claims 1-3 for the preparation of a refrigeration device.
5. The use according to claim 4, wherein the refrigeration device is an air conditioner.
6. A refrigeration device characterized in that the mixed refrigerant according to any one of claims 1 to 3 is used as a heat transfer fluid.
7. The method for preparing a mixed refrigerant according to any one of claims 1 to 3, wherein the first component, the second component and the third component are physically and uniformly mixed in a liquid phase state at room temperature according to mass percentages of the components, thereby obtaining the mixed refrigerant.
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