CN110628388A - Mixed working medium suitable for scroll compressor and automobile air conditioning system - Google Patents
Mixed working medium suitable for scroll compressor and automobile air conditioning system Download PDFInfo
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- CN110628388A CN110628388A CN201910863328.9A CN201910863328A CN110628388A CN 110628388 A CN110628388 A CN 110628388A CN 201910863328 A CN201910863328 A CN 201910863328A CN 110628388 A CN110628388 A CN 110628388A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
- B60H2001/3257—Cooling devices information from a variable is obtained related to temperature of the refrigerant at a compressing unit
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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
- C09K2205/10—Components
- C09K2205/12—Hydrocarbons
- C09K2205/122—Halogenated hydrocarbons
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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
- C09K2205/10—Components
- C09K2205/12—Hydrocarbons
- C09K2205/126—Unsaturated fluorinated hydrocarbons
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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
- C09K2205/22—All components of a mixture being fluoro compounds
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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
- C09K2205/32—The mixture being azeotropic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses
Abstract
The invention provides a mixed working medium suitable for a scroll compressor, which comprises a first component, a second component and a third component, wherein: the first component is one of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea) and 1,1,1, 2-tetrafluoroethane (R134a), the second component is 3,3, 3-trifluoropropene (R1243zf), and the third component is one of 2,3,3, 3-tetrafluoropropene (R1234yf), 1, 1-difluoroethane (R152a), and trans-1, 3,3, 3-tetrafluoropropene (R1234ze (E)). The GWP of the mixed working medium adopted in the invention is less than or equal to 600, the ODP is 0, the mixed working medium has obvious environmental protection advantages, and the mixed working medium is a near-azeotropic refrigerant, so that the problem of refilling of the refrigerant after leakage is not required to be considered. The scroll compressor adopting the mixed working medium can replace a common R134a refrigerant without changing a device, thereby realizing safe and environment-friendly work.
Description
Technical Field
The invention relates to a refrigeration technology, in particular to a mixed working medium suitable for a scroll compressor and an automobile air conditioning system.
Background
In an air conditioning system of a vehicle or the like, a scroll compressor is currently used to compress a refrigerant, and a commonly used refrigerant is R134a, which has a GWP of 1300 and an ODP of 0. With the trend of environmental protection becoming more serious, and with respect to the "greenhouse effect" of HFCs, the montreal protocol amendment requires a refrigerant which is not ozone-depleting and has a low GWP value to replace the current high GWP refrigerant, and is effectively applied to air conditioning systems. The current technical means always searches a mixed working medium which can be directly applied to an automobile air conditioning system from the perspective of a single working medium and the mixed working medium, but does not find a working medium which can perfectly replace R134 a.
Disclosure of Invention
In view of this, the invention provides a mixed working medium suitable for a scroll compressor, wherein the GWP of the adopted mixed working medium is less than or equal to 600, the ODP is 0, and the mixed working medium has obvious environmental protection advantages. And because the mixed working medium is a near-azeotropic refrigerant, the problem of refilling of the refrigerant after leakage is not required to be considered, meanwhile, the mixed working medium has good thermal performance, is applied to an automobile air-conditioning system, has the capability and the energy efficiency equivalent to those of the R134a refrigerant, can replace the R134a working medium, and does not change the system.
In order to achieve the purpose, the invention adopts the technical scheme that: a mixed working medium suitable for a scroll compressor is a near azeotropic mixture and comprises a first component, a second component and a third component, wherein the mixed working medium comprises the following components in percentage by mass: the first component is one of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea) and 1,1,1, 2-tetrafluoroethane (R134a), the second component is 3,3, 3-trifluoropropene (R1243zf), and the third component is one of 2,3,3, 3-tetrafluoropropene (R1234yf), 1, 1-difluoroethane (R152a), and trans-1, 3,3, 3-tetrafluoropropene (R1234ze (E)); wherein the heat transfer composition has a Global Warming Potential (GWP) of not greater than 600. The near-azeotropic mixture is used in a refrigeration system without concern for refilling after refrigerant leakage.
Further optionally, when the first component is 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), the third component further comprises 1,1,1, 2-tetrafluoroethane (R134 a). The two components are non-combustible substances, so that the safety performance of the environment-friendly mixed refrigerant is greatly improved.
Further optionally, the mixed working medium for the scroll compressor comprises three components, and the three components comprise, by mass, 4% to 44% of the first component, 4% to 84% of the second component, and 4% to 84% of the third component. The weight ratio of the three components of the environment-friendly mixed refrigerant is respectively in the range, the refrigerant is a near-azeotropic mixture, the thermal performance of the refrigerant is equivalent to that of R134a, and the refrigerant can completely replace R134a refrigerant.
Further optionally, the mixed working fluid for the scroll compressor comprises 44% by mass of 1,1,1, 2-tetrafluoroethane (R134a), 4% by mass of 3,3, 3-trifluoropropene (R1243zf) and 52% by mass of 2,3,3, 3-tetrafluoropropene (R1234 yf). The mixed working medium prepared by mixing the three components has better volume refrigerating capacity which reaches 102.8 percent of R134 a.
The invention provides a composition suitable for use in motor vehicle air conditioners comprising a lubricant and a mixed working fluid according to any one of the preceding claims.
Further optionally, wherein the lubricant is selected from: at least one of mineral oil, silicone oil, polyalkyl benzenes (PABs), polyol esters (POEs), polyalkylene glycols (PAGs), polyalkylene glycol esters (PAG esters), polyvinyl ethers (PVEs), poly (alpha-olefins), or a combination of at least two thereof. The lubricant has good compatibility with the mixed working medium, ensures the normal operation of a refrigeration system using the composition, and has positive influence on the service life of the refrigeration system.
Further optionally, it further comprises a stabilizer selected from the group consisting of: diene-based compounds, phosphates, phenolic compounds and epoxides, and mixtures thereof. The stability of the mixed working medium can be improved, and the heat exchange efficiency of the mixed working medium is improved.
The invention also provides an automobile air-conditioning refrigeration system, which uses the mixed working medium or the composition, wherein the deviation of the compressor discharge temperature of the mixed working medium or the composition is less than 3.5 ℃.
Further optionally, wherein the compressor discharge temperature deviation of the mixed working fluid or composition is less than 2.5 ℃.
The components of the present invention are commercially available or can be prepared by methods known in the art. The content ratio of each component in the invention is obtained by screening a large number of components, and is a condition for ensuring the excellent performance of the mixed working medium.
The invention has the beneficial effects that:
(1) the mixed working medium suitable for the scroll compressor is convenient to use without changing the design of a refrigerating system in the scroll compressor.
(2) The invention relates to a mixed working medium which is suitable for a scroll compressor and is added with 1,1,1,2,3,3, 3-heptafluoropropane (R227ea) and 1,1,1, 2-tetrafluoroethane (R134a), wherein the 1,1,1,2,3, 3-heptafluoropropane and the 1,1,1, 2-tetrafluoroethane are non-combustible components, the flammability of other components can be weakened by increasing the content change of the non-combustible components, and further the mixed working medium which is non-combustible and has good safety performance is obtained, the GWP of the mixed working medium is less than or equal to 600, and the ODP is 0.
(3) Compared with the R134a working medium, the mixed working medium has obvious environmental protection advantages, has good thermal performance, is applied to a scroll compressor, has the capacity and the energy efficiency equivalent to those of the scroll compressor using the R134a working medium, can replace the R134a working medium, and does not change the scroll compressor.
(4) The mixed working medium is a near azeotropic refrigerant. The scroll compressor adopting the mixed working medium does not need to be provided with a corresponding scheme to prevent the reduction of heat exchange efficiency caused by temperature slippage in the scroll compressor.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.
FIG. 1 is a diagram of a single-stage compression cycle of a scroll compressor system in accordance with an embodiment of the present invention;
in the figure:
1-a turbo compressor; 2-a condenser; 3-an evaporator; 40-a throttle valve;
Detailed Description
Conventionally, as a refrigerant for a refrigerator, chlorofluorocarbons (CFCs), Hydrochlorofluorocarbons (HCFCs), and the like have been used, but since they are compounds containing chlorine which causes environmental problems, alternative refrigerants containing no chlorine, such as Hydrofluorocarbons (HFCs), have been studied. As such hydrofluorocarbons, compounds represented by, for example, 1,1,1, 2-tetrafluoroethane, difluoromethane, pentafluoroethane, and 1,1, 1-trifluoroethane (hereinafter referred to as R134a, R32, R125, and R143a, respectively) have attracted attention, and for example, R134a has been mainly used in automobile air-conditioning systems. However, this HFC also has concerns about the effect on global warming, for example, because of the high Global Warming Potential (GWP) of R134a, and therefore a refrigerant suitable for environmental protection and having better thermal performance is further sought.
However, for the scroll compressor commonly used in the automotive air conditioning system, there are specific requirements for the refrigerant:
1. the abrasion problems of oil shortage of the compressor and insufficient lubrication of the compressor caused by the refrigerant are avoided. The scroll compressor has the outstanding wear problem, the exhaust temperature is high, the required refrigerant has good thermal property and thermal stability, the wear of the compressor can be adapted, and the thermal property of the working medium is ensured when the temperature of the exhaust or the top of the compressor is overhigh; the lubricating oil cooling system has the advantages that the good compatibility between the refrigerant and the lubricating oil is avoided, the problems that the lubricating oil of a compressor is less due to the fact that the system returns liquid or the refrigerant migrates to dilute the lubricating oil and the system refrigerant leaks, other chemical substances exist in the system, the lubricating oil is deteriorated after the chemical reaction with the lubricating oil, and the like are avoided. If the system contains air or moisture, such as during refrigerant recharge, it is likely that the compressor will be starved of oil and the compressor will be starved of lubrication.
2. The liquid impact problem caused by the refrigerant is avoided. When a large amount of liquid returns from the compressor, the liquid drops generate great impulsive force on the scroll disk in the compression process, and the scroll disk can be broken; lubricating oil containing a large amount of liquid refrigerant has low viscosity, and cannot form a sufficient oil film on a friction surface, so that moving parts in the compressor are quickly abraded; the refrigerant in the lubricating oil can be boiled when heated in the conveying process, and the normal conveying of the lubricating oil is influenced. The fluid-impacted scroll debris falls onto the coil, damaging the coil insulation, and potentially causing current protection or compressor built-in protection to fail. Further, if the refrigerant is excessively added, the liquid slugging problem may be caused by an excessive amount of oil.
3. In a compression refrigerator, since the temperature in the compressor is high and the temperature in the cooler is low, it is required that a refrigerant and a refrigerator oil circulate in the system without phase separation in a wide temperature range from low temperature to high temperature, and that the refrigerant has good compatibility with the refrigerator oil and sufficient stability. Therefore, in the refrigeration system of an automobile air conditioner, a refrigerant having a low Global Warming Potential (GWP), being environmentally friendly, having excellent compatibility with a refrigerator oil, having excellent stability, and having good thermal properties has been demanded.
The invention provides a mixed working medium suitable for a scroll compressor, which can be directly applied to an automobile air conditioning system. Preferably, the vehicle air conditioning system does not require any modification. The GWP of the mixed working medium used by the system is less than or equal to 600, the ODP is 0, and the system has obvious environmental protection advantages, the mixed working medium is a near-azeotropic refrigerant, the boiling points of the components of the mixed working medium are similar, the contents of all the components cannot be changed after the working medium is evaporated and condensed in the system, the refrigerant can be directly additionally filled after leakage, and the waste of resources is caused without evacuation and re-filling.
The preparation method of the mixed working medium used by the scroll compressor comprises the steps of physically mixing various components such as 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf), 1,1,1, 2-tetrafluoroethane (R134a), 2,3,3, 3-tetrafluoropropene (R1234yf), 1, 1-difluoroethane (R152a) and trans-1, 3,3, 3-tetrafluoropropene (R1234ze (E)) according to different mass percentages in a normal temperature and normal pressure liquid phase state, and uniformly mixing to obtain the mixed working medium. Wherein, 1,1,1,2,3,3, 3-heptafluoropropane (R227ea) and 1,1,1, 2-tetrafluoroethane (R134a) are all non-combustible components, and the combustibility of the rest components can be weakened by adding the non-combustible components, thereby achieving the safety requirement, and achieving the purposes that the mixed working medium has low GWP (not more than 600) and is non-combustible, thereby achieving the safety requirement. The basic parameters of the component materials are shown in Table 1.
TABLE 1 basic parameters of the component substances in the working mixture
Specific examples are given below, wherein the proportions of the components are mass percentages, and the sum of the mass percentages of the component substances of each mixed working medium is 100%. In each embodiment and each comparative example, the components are subjected to liquid phase physical mixing according to a fixed mass percentage under a normal temperature and normal pressure liquid phase state, and the mixed working medium is obtained by uniformly mixing.
In example 1, three components, namely 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and 1, 1-difluoroethane (R152a) are physically mixed according to the mass percent of 16:80:4 under the normal temperature and pressure liquid phase, and the mixture is uniformly mixed to obtain a mixed working medium.
Example 2, three components of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and trans-1, 3,3, 3-tetrafluoropropene (R1234ze (E)) are physically mixed at the normal temperature and pressure in a liquid phase according to the mass percent of 16:80:4, and the mixture is uniformly mixed to obtain a mixed working medium.
Example 3, three components of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and trans-1, 3,3, 3-tetrafluoropropene (R1234ze (E)) are physically mixed at normal temperature and normal pressure in a liquid phase according to the mass percent of 16:48:36, and the mixture is uniformly mixed to obtain a mixed working medium.
Example 4, three components of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and 1,1,1, 2-tetrafluoroethane (R134a) were physically mixed at normal temperature and pressure in a liquid phase at a mass ratio of 4:68:28, and mixed uniformly to obtain a mixed working medium.
Example 5, three components of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and 2,3,3, 3-tetrafluoropropene (R1234yf) were physically mixed at normal temperature and pressure in a liquid phase at a mass ratio of 16:80:4, and a mixed working medium was obtained by mixing them uniformly.
Example 6, three components of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and 2,3,3, 3-tetrafluoropropene (R1234yf) are physically mixed according to the mass percent of 16:76:8 under normal temperature and pressure and are uniformly mixed to obtain a mixed working medium.
Example 7, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and 1, 1-difluoroethane (R152a) were physically mixed at normal temperature and pressure in a liquid phase at a mass ratio of 40:56:4, and mixed uniformly to obtain a mixed working fluid.
In example 8, three components, 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and 1, 1-difluoroethane (R152a) were physically mixed at room temperature and normal pressure in a liquid phase at a mass ratio of 36:36:28, and mixed uniformly to obtain a mixed working fluid.
Example 9, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and 1, 1-difluoroethane (R152a) were physically mixed at normal temperature and pressure in a liquid phase at a mass ratio of 32:64:4, and mixed uniformly to obtain a mixed working fluid.
In example 10, three components, 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and 1, 1-difluoroethane (R152a) were physically mixed at room temperature and normal pressure in a liquid phase at a mass ratio of 36:32:32, and mixed uniformly to obtain a mixed working fluid.
Example 11, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and trans 1,3,3, 3-tetrafluoropropene (R1234ze (E)) were physically mixed at a mass ratio of 40:56:4 in a normal temperature and pressure liquid phase, and a mixed working medium was obtained by mixing them uniformly.
Example 12, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and trans 1,3,3, 3-tetrafluoropropene (R1234ze (E)) were physically mixed at a mass ratio of 36:28:36 under normal temperature and pressure in a liquid phase, and a mixed working medium was obtained by mixing them uniformly.
Example 13, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and trans 1,3,3, 3-tetrafluoropropene (R1234ze (E)) were physically mixed at a mass ratio of 40:40:20 in a normal temperature and pressure liquid phase, and a mixed working medium was obtained by mixing them uniformly.
Example 14, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and trans 1,3,3, 3-tetrafluoropropene (R1234ze (E)) were physically mixed at normal temperature and pressure in a liquid phase at a mass ratio of 32:48:20, and mixed uniformly to obtain a mixed working medium.
Example 15, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and 2,3,3, 3-tetrafluoropropene (R1234yf) were physically mixed at normal temperature and pressure in a liquid phase at a mass ratio of 44:40:16, and mixed uniformly to obtain a mixed working medium.
Example 16, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and 2,3,3, 3-tetrafluoropropene (R1234yf) were physically mixed at normal temperature and pressure in a liquid phase at a mass ratio of 44:4:52, and mixed uniformly to obtain a mixed working medium.
Example 17, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and 1, 1-difluoroethane (R152a) were physically mixed at normal temperature and pressure in a liquid phase at a mass ratio of 44:40:16, and mixed uniformly to obtain a mixed working fluid.
Example 18 three components of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and trans 1,3,3, 3-tetrafluoropropene (R1234ze (E)) were physically mixed at room temperature and normal pressure in a liquid phase at a mass ratio of 12:84:4, and a mixed working medium was obtained by mixing them uniformly.
Example 19, three components of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and 1, 1-difluoroethane (R152a) were physically mixed at a normal temperature and pressure in a liquid phase at a mass ratio of 12:4:84, and a mixed working fluid was obtained by mixing them uniformly.
Comparative example 1, three components of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and trans 1,3,3, 3-tetrafluoropropene (R1234ze (E)) are physically mixed according to the mass percent of 0:16:84 under normal temperature and pressure and are uniformly mixed to obtain a mixed working medium.
Comparative example 2, three components of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), 3,3, 3-trifluoropropene (R1243zf) and trans 1,3,3, 3-tetrafluoropropene (R1234ze (E)) are physically mixed according to the mass percent of 46:24:30 under normal temperature and pressure and are uniformly mixed to obtain a mixed working medium.
Comparative example 3, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and trans 1,3,3, 3-tetrafluoropropene (R1234ze (E)) are physically mixed according to the mass percent of 44:0:56 under normal temperature and pressure liquid phase, and the mixture is uniformly mixed to obtain a mixed working medium.
Comparative example 4, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and trans 1,3,3, 3-tetrafluoropropene (R1234ze (E)) are physically mixed according to the mass percent of 4:86:10 under normal temperature and pressure liquid phase, and the mixture is uniformly mixed to obtain a mixed working medium.
Comparative example 5, three components of 1,1,1, 2-tetrafluoroethane (R134a), 3,3, 3-trifluoropropene (R1243zf) and 1, 1-difluoroethane (R152a) are physically mixed according to the mass percent of 10:4:86 under normal temperature and pressure liquid phase, and the mixture is uniformly mixed to obtain the mixed working medium.
Table 2 compares the mixed working fluids of the above examples and comparative examples with basic parameters of R134a, such as molecular weight, normal boiling point, and environmental performance.
TABLE 2 basic thermophysical parameters of the mixed working fluids
As can be seen from Table 2, the environmental performance of the mixed working medium provided by the invention is far better than that of R134a, and the GWP of the mixed working medium is less than 600; the sliding temperature of the mixed working medium is low, the mixed working medium belongs to a near azeotropic mixture, adverse effects caused by temperature sliding are eliminated, and the problem of refilling after the refrigerant leaks is not required to be considered.
According to the use scene, other components can be added into the formula of the mixed working medium provided by the invention, and the obtained composition can ensure that the mixed working medium has better energy efficiency in the use scene.
The embodiment also provides a composition suitable for an automobile air conditioner, which comprises a lubricant and the mixed working fluid of the embodiment. Preferably, the lubricant is selected from: at least one of mineral oil, silicone oil, polyalkyl benzenes (PABs), polyol esters (POEs), polyalkylene glycols (PAGs), polyalkylene glycol esters (PAG esters), polyvinyl ethers (PVEs), poly (alpha-olefins), or a combination of at least two thereof. Preferably, the stabilizer is further contained, and the stabilizer is selected from the following group: diene-based compounds, phosphates, phenolic compounds and epoxides, and mixtures thereof. The refrigerant can play the greatest role under the condition of safe and efficient operation of the heat exchange system of the automobile air conditioner. Preferably, the deviation of the compressor discharge temperature of the mixed working fluid or composition in the automotive air conditioning system is less than 3.5 ℃. It is further preferred that the deviation in the compressor discharge temperature of the mixed working fluid or composition in the automotive air conditioning system is less than 2.5 ℃.
The above-described embodiments and comparative examples are applied to the system of the scroll compressor proposed in the present invention, instead of the R134a refrigerant. One cycle mode of the system, a single stage compression cycle, is shown in fig. 1. The refrigerant is compressed into high-temperature and high-pressure gas in the scroll compressor 1, is condensed into medium-temperature and medium-pressure liquid through the condenser 2, is throttled into medium-temperature and low-pressure gas-liquid two phases through the throttle valve 40, is evaporated into low-temperature and low-pressure gas through the evaporator 3, and finally enters the scroll compressor 1 for circulation.
Table 3 compares the thermodynamic parameters (i.e. compression ratio and exhaust temperature) and relative thermodynamic properties (i.e. relative refrigerating capacity per unit volume and relative efficiency COP) of the mixed working media in the above examples and comparative examples under the refrigeration condition (i.e. evaporation temperature of 6 ℃, condensation temperature of 36 ℃, superheat degree of 5 ℃ and supercooling degree of 5 ℃) with R134 a.
TABLE 3 comparison of Performance of working mixtures with R134a
(slip temperature is the difference between dew point temperature and bubble point temperature under working pressure, maximum value is taken)
As can be seen from Table 3, the thermal performance, namely the volume heating capacity and the COP value of the mixed working medium are equivalent to those of R134a, and the mixed working medium can be used as an environment-friendly refrigerant for replacing R134 a.
In conclusion, when the content of the components in the formula is changed or the prepared mixed working medium is formed, the components cannot play a synergistic role, the sliding temperature and/or the inflammability of the mixed working medium can be increased, and the heat exchange effect and the environmental protection performance of a unit are influenced when the mixed working medium is used. Specifically, varying the amounts of components in the formulation also increases the slip temperature and/or the flammability and/or GWP, as in comparative example 2/4/5; when the components of the formula are reduced, if the component one is removed in the comparative example 1, the relative volume refrigerating capacity of the obtained mixed working medium is smaller, only the component two and the component three in the invention are reserved in the comparative example 3, the temperature slippage of the obtained mixed working medium is larger, the content of the mixed working medium of the total comparative example is out of the range of the invention, and the combination data shows that the boiling point of the mixed working medium of the comparative example is far smaller than R134a and the mixed working medium is used for directly replacing R134a, so that the performance of a unit is deteriorated.
Therefore, the near-azeotropic mixed working medium provided by the invention not only has the environmental protection characteristics of low GWP and zero ODP, but also has the thermal performance equivalent to R134a through the synergistic effect of all the components.
To sum up, the mixed working medium suitable for the scroll compressor has the environmental protection characteristics of low GWP and zero ODP, has excellent thermal performance, is applied to the scroll compressor under the same refrigeration working condition, has the capacity refrigeration capacity and the energy efficiency COP equivalent to those of the scroll compressor using the R134a working medium, and can be used as the mixed working medium for replacing R134 a. The temperature slippage is small, the mixed working medium is a near azeotropic mixed working medium, the volume refrigerating capacity and the energy efficiency of the mixed working medium are equivalent to those of an automobile air conditioning system using R134a refrigerant, the system does not need to be modified, and the problem of refilling after the refrigerant leaks is not considered. Meanwhile, the mixed working medium provided by the invention can be selectively added with additives such as lubricant, stabilizer, super-strong agent and the like according to the requirements of a refrigerating system to enhance the performance of the mixed working medium and the stability of the refrigerating system.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. The utility model provides a be suitable for mixed working medium of scroll compressor which characterized in that: the mixed working medium is a near-azeotropic mixture and comprises a first component, a second component and a third component, wherein the mixed working medium comprises the following components in percentage by mass: the first component is one of 1,1,1,2,3,3, 3-heptafluoropropane (R227ea) and 1,1,1, 2-tetrafluoroethane (R134a), the second component is 3,3, 3-trifluoropropene (R1243zf), and the third component is one of 2,3,3, 3-tetrafluoropropene (R1234yf), 1, 1-difluoroethane (R152a), and trans-1, 3,3, 3-tetrafluoropropene (R1234ze (E)); wherein the heat transfer composition has a Global Warming Potential (GWP) of not greater than 600.
2. The mixed working medium applicable to the scroll compressor as claimed in claim 1, wherein: when the first component is 1,1,1,2,3,3, 3-heptafluoropropane (R227ea), the third component further comprises 1,1,1, 2-tetrafluoroethane (R134 a).
3. The mixed working medium applicable to the scroll compressor as claimed in claim 2, wherein: the mixed working medium used by the scroll compressor comprises three components, and the three components comprise 4-44% of the first component, 4-84% of the second component and 4-84% of the third component in percentage by mass.
4. The mixed working medium suitable for the scroll compressor as claimed in any one of claims 1 to 3, wherein: the mixed working medium used by the scroll compressor comprises 44% of 1,1,1, 2-tetrafluoroethane (R134a), 40% of 3,3, 3-trifluoropropene (R1243zf) and 16% of 1, 1-difluoroethane (R152a) in percentage by mass.
5. The mixed working medium suitable for the scroll compressor as claimed in any one of claims 1 to 3, wherein: the mixed working medium for the scroll compressor comprises 44% of 1,1,1, 2-tetrafluoroethane (R134a), 4% of 3,3, 3-trifluoropropene (R1243zf) and 52% of 2,3,3, 3-tetrafluoropropene (R1234yf) in percentage by mass.
6. A composition suitable for use in automotive air conditioning comprising a lubricant and a mixed working fluid according to any one of the preceding claims.
7. The composition of claim 6, wherein the lubricant is selected from the group consisting of: at least one of mineral oil, silicone oil, polyalkyl benzenes (PABs), polyol esters (POEs), polyalkylene glycols (PAGs), polyalkylene glycol esters (PAG esters), polyvinyl ethers (PVEs), poly (alpha-olefins), or a combination of at least two thereof.
8. The composition of any one of claims 6-7, further comprising a stabilizer selected from the group consisting of: diene-based compounds, phosphates, phenolic compounds and epoxides, and mixtures thereof.
9. An automobile air-conditioning refrigeration system, which uses the mixed working medium or composition as claimed in any one of claims 1-8, wherein the compressor discharge temperature deviation of the mixed working medium or composition is less than 3.5 ℃.
10. A vehicle air conditioning refrigeration system as set forth in claim 9 wherein: wherein the compressor discharge temperature deviation of the mixed working medium or the composition is less than 2.5 ℃.
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