CN117984721A - Heat pump air conditioning system of electric automobile - Google Patents
Heat pump air conditioning system of electric automobile Download PDFInfo
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- CN117984721A CN117984721A CN202211381567.9A CN202211381567A CN117984721A CN 117984721 A CN117984721 A CN 117984721A CN 202211381567 A CN202211381567 A CN 202211381567A CN 117984721 A CN117984721 A CN 117984721A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 44
- 238000012546 transfer Methods 0.000 claims abstract description 65
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000010687 lubricating oil Substances 0.000 claims abstract description 20
- MIZLGWKEZAPEFJ-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical group FC=C(F)F MIZLGWKEZAPEFJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 claims abstract description 18
- YHLIEGBCOUQKHU-UHFFFAOYSA-N 1,1-difluoroprop-1-ene Chemical compound CC=C(F)F YHLIEGBCOUQKHU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
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- VJGCZWVJDRIHNC-UHFFFAOYSA-N 1-fluoroprop-1-ene Chemical compound CC=CF VJGCZWVJDRIHNC-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 20
- NGOCAPPEAVAHQM-UHFFFAOYSA-N 2-fluoroprop-1-ene Chemical compound CC(F)=C NGOCAPPEAVAHQM-UHFFFAOYSA-N 0.000 claims description 9
- -1 polyol ester Chemical class 0.000 claims description 5
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
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- HJISFKJQGKPWFE-NSCUHMNNSA-N (e)-1,2-difluoroprop-1-ene Chemical compound C\C(F)=C/F HJISFKJQGKPWFE-NSCUHMNNSA-N 0.000 claims description 2
- HJISFKJQGKPWFE-IHWYPQMZSA-N (z)-1,2-difluoroprop-1-ene Chemical compound C\C(F)=C\F HJISFKJQGKPWFE-IHWYPQMZSA-N 0.000 claims description 2
- INPRTAFPJCUIBZ-UHFFFAOYSA-N 1,3-difluoroprop-1-ene Chemical compound FCC=CF INPRTAFPJCUIBZ-UHFFFAOYSA-N 0.000 claims description 2
- SGGPUNTZIKXDMQ-UHFFFAOYSA-N 2,3-difluoroprop-1-ene Chemical compound FCC(F)=C SGGPUNTZIKXDMQ-UHFFFAOYSA-N 0.000 claims description 2
- BUMFHKJRHRUGNU-UHFFFAOYSA-N 3,3-difluoroprop-1-ene Chemical compound FC(F)C=C BUMFHKJRHRUGNU-UHFFFAOYSA-N 0.000 claims description 2
- 239000010963 304 stainless steel Substances 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
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- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 2
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Abstract
The invention discloses an electric automobile heat pump air conditioning system, which comprises a heat transfer medium with GWP less than 150, a plastic part, a sealing part and a metal part which are contacted with the heat transfer medium, and lubricating oil which is compatible with the heat transfer medium at the oil content of 5-60%, wherein the heat transfer medium comprises the following components: hexafluoropropylene as a first component, trifluoroethylene as a second component, and a third component selected from at least one of fluoropropene, difluoropropene, difluoromethane; the first component accounts for 30-50% of the total mass of the heat transfer medium, the second component accounts for 30-50% of the total mass of the heat transfer medium, and the third component accounts for 10-30% of the total mass of the heat transfer medium. The heat transfer medium can replace R410A to be used for an electric automobile heat pump air conditioning system using R410A originally, parts of the heat pump air conditioning system do not need to be replaced, meanwhile, the environment performance is far better than that of R410A, the circulation performance is equivalent to that of R410A, and the heat transfer medium is far better than that of a large amount of R134a and R1234yf used for a commercial electric automobile heat pump air conditioning system.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a heat pump air conditioning system of an electric automobile, which comprises a heat transfer medium with environmental performance far superior to R410A, good compatibility with plastic parts, sealing parts and metal parts and good compatibility with lubricating oil under the oil content of 5-60%.
Background
The contract prescription of Montreal protocol achieves the basic calix amendment in 2016, aims at limiting and controlling greenhouse gases Hydrofluorocarbon (HFCs), and opens a new chapter of history of synergetic response to ozone depletion and climate change. Implementation of the keplus amendment, which was effective in China at 9 and 15 days 2021, is expected to reduce emissions of 88% HFCs and prevent global warming of 0.5℃at the end of this century.
Along with establishment of a double-carbon target in China, development of a low-carbon green technology is important. As the automobile industry of the national post industry, especially the new energy automobile field, the prior HFCs with high GWP value are cut down, and the development of novel environment-friendly alternative refrigerants is urgent.
The EU MAC instruction, the automobile air conditioner refrigerant is not filled with fluorine-containing gas with GWP exceeding 150 in all vehicles after 2017, 1 month and 1 day. The european union F-GAS regulations 517 prescribes that the european union region exercise quota for the production or import volumes of HFCs producers and importers from 1 month 1 day 2015. The European requirements of outlets of the existing air-conditioning refrigerants R134a and R410A are paid with quota fees. Therefore, the development of the novel environment-friendly alternative refrigerant not only has social benefit, but also has economic benefit, and can promote the healthy development of industry.
The substitution development of the refrigerant needs to give consideration to environmental protection and usability, one of the main problems in the use process of the electric automobile at present is the anxiety of the endurance mileage of the user, and the problem is more obvious in winter, especially in cold areas due to the fact that the heating of the cockpit is involved. The heat pump air conditioning system of the electric automobile replaces the traditional PTC heating, so that the consumption of electric quantity can be effectively reduced, and meanwhile, the heating requirement of a cockpit is met. The essence of the heat pump technology is that heat outside the vehicle is "carried" to the interior of the vehicle for heating, no heat is generated by the heat pump technology itself, and the working principle is based on the "reverse Carnot cycle".
At present, the heat transfer working medium of the heat pump air conditioning system of the electric automobile mainly comprises:
1. R134a has the characteristics of no color, no toxicity, incombustibility, low viscosity, high vaporization latent heat, large specific heat and the like, is the most commonly used refrigerant in the automobile air conditioner in the current development China, has high greenhouse effect potential value (GWP=1300), is relatively reduced, has poor heating performance, and does not meet the requirement that the GWP of the refrigerant of the automobile air conditioner in European MAC instructions is less than 150.
2. The R1234yf has similar thermal physical properties to R134a, and the performance parameters such as refrigerating capacity and COP are similar to those of R134a through test, so that the R134a in the existing automobile air conditioner can be directly replaced, but the R1234yf has insufficient low-temperature heating capacity, high price and weak combustibility.
3. CO2 (R744) has the advantages of excellent environmental performance, incombustibility, no toxicity, low kinematic viscosity and low cost, and is one of hot spots in current research, but the main problems are large transcritical circulating pressure, large throttling loss, poor high-temperature refrigeration performance and high cost caused by high system pressure resistance requirement.
4. R410A has a lower boiling point (-51 ℃) and obviously better refrigerating and heating performance than R134a, and is suitable for low-temperature working conditions, but has GWP as high as 2088 and is subject to reduction or even elimination.
The existing heat transfer working medium applied to the heat pump air conditioning system of the electric automobile can not meet the requirements of refrigeration and heating at the same time or has the problem that the environmental performance can not meet the environmental protection requirement, and a novel working medium needs to be developed for replacement.
Disclosure of Invention
In order to solve the technical problems, the invention provides the heat pump air conditioning system of the electric automobile, which is filled with a heat transfer medium with low GWP, excellent refrigerating and heating performance, moderate operating pressure, good material compatibility and good intersolubility with lubricating oil, so that the heat pump air conditioning system not only can meet the cooling requirement of the electric automobile in summer, but also can effectively solve the heating problem in winter.
The invention aims at realizing the following technical scheme:
An electric vehicle heat pump air conditioning system comprising a heat transfer medium having a GWP < 150, a plastic part, a sealing part and a metal part in contact with the heat transfer medium, a lubricating oil compatible with the heat transfer medium at an oil content of 5-60%, the heat transfer medium comprising:
Hexafluoropropylene as a first component;
trifluoroethylene as a second component;
and a third component selected from at least one of fluoropropenes, difluoropropenes, difluoromethanes.
In the operation process of the heat pump air conditioning system, the heat transfer medium can be in direct contact with plastic parts, sealing parts, metal parts and the like, wherein the material of the plastic parts is at least one of epoxy resin, ABS and nylon 66, the material of the sealing parts is at least one of natural rubber, butyl rubber, ethylene propylene diene monomer rubber and nitrile rubber, and the material of the metal parts is at least one of copper, aluminum and 304 stainless steel. The heat transfer medium of the application has good compatibility with the materials, and specifically: the compatibility coefficient of the plastic piece, the sealing piece and the heat transfer medium is 0.8-0.9 at 100-120 ℃; the compatibility coefficient of the metal piece and the heat transfer medium is 0.9-1 at 150-175 ℃.
In the operation process of the heat pump air conditioning system, the heat transfer medium is mixed with lubricating oil for use, so that the stability of the heat transfer medium in the operation process of the system is improved. The heat transfer medium is provided for a heat pump air conditioning system adopting polyol ester (POE) or polyether lubricating oil (PAG) as lubricating oil, wherein the polyol ester (POE) or polyether lubricating oil (PAG) can be commercial lubricating oil with the brand of Suniso SL-32S, cryolant RB, suniso T68, danfoss 160sz or CPI RPAG 65 and the like, and is clear and transparent with lubricating oil at the oil content of 5-60% at the temperature of more than-29.6 ℃, and has good intersolubility.
According to the electric automobile heat pump air conditioning system, the fluoropropene is at least one selected from E-1-fluoro-1-propylene, Z-1-fluoro-1-propylene, 2-fluoropropene and 3-fluoro-1-propylene; the difluoropropene is at least one selected from 3, 3-difluoro-1-propene, 2, 3-difluoro-1-propene, 1-difluoropropene, (E) -1, 2-difluoro-1-propene, 1, 3-difluoro-1-propene and 1, 2-difluoro-1-propene.
Preferably, the fluoropropene is selected from 2-fluoropropenes and the difluoropropene is selected from 1, 1-difluoropropenes.
The heat transfer medium is obtained by physically mixing the components according to the mass ratio to form a stable composition.
The heat transfer medium of the present invention is mainly used for replacing R410A, and thus, it is also required to have refrigerating and heating properties equivalent to or higher than R410A on the basis of having outstanding environmental performance advantages. Therefore:
the first component accounts for 30-50% of the total mass of the heat transfer medium;
the second component accounts for 30-50% of the total mass of the heat transfer medium;
the third component accounts for 10 to 30 percent of the total mass of the heat transfer medium.
In the running process of the heat pump air conditioning system of the electric automobile, the smaller temperature slippage can reduce the leakage rate of low-boiling-point components in the composition; in addition, considering low temperature conditions, such as ambient temperature below-15 ℃, in order to reduce the dependence on PTC, it is desirable that the composition have excellent low temperature heating properties. Therefore, it is further preferable that,
The first component accounts for 35-45% of the total mass of the heat transfer medium;
The second component accounts for 35-40% of the total mass of the heat transfer medium;
the third component accounts for 15-25% of the total mass of the heat transfer medium.
In one embodiment, the third component is difluoromethane and the heat transfer medium comprises: hexafluoropropylene 35-45%, trifluoroethylene 30-40%, difluoromethane 15-20%; the formula can simultaneously give consideration to safety performance and environmental protection performance, and has more excellent cycle performance.
In another embodiment, the third component is difluoromethane and 2-fluoropropene, and the heat transfer medium comprises: 35-45% of hexafluoropropylene, 30-40% of trifluoroethylene, 15-19% of difluoromethane and 1-10% of 2-fluoropropene, and the formula can simultaneously give consideration to safety performance and cycle performance and has more excellent environmental protection performance.
In another embodiment, the third component is difluoromethane and 1, 1-difluoropropene, and the heat transfer medium comprises: 35-45% of hexafluoropropylene, 30-40% of trifluoroethylene, 15-19% of difluoromethane and 1-10% of 1, 1-difluoropropylene; the formula can simultaneously give consideration to safety performance and cycle performance, and has more excellent environmental protection performance.
The heat transfer medium is developed aiming at the original electric automobile heat pump air conditioning system using R410A, has good material compatibility and lubricating oil intersolubility with the original heat pump air conditioning system, and can be directly filled without replacing parts of the original heat pump air conditioning system when the heat transfer medium is used for replacing R410A in the original electric automobile heat pump air conditioning system using R410A.
Compared with the prior art, the invention has the following beneficial effects:
1. the heat transfer medium in the heat pump air conditioning system of the electric automobile has good compatibility with materials in the heat pump air conditioning system and good intersolubility with lubricating oil in the heat pump air conditioning system, can be stably carried out for a long time, can replace R410A to be used without any change of the system, has environmental performance (ODP is 0 and GWP is less than 150) far superior to R410A, and has circulation performance equivalent to R410A far superior to the circulation performance of R134a and R1234yf adopted in the commercialized heat pump air conditioning system of the electric automobile.
2. The boiling point (1 atm) of the heat transfer medium in the heat pump air conditioning system of the electric automobile is less than or equal to-45 ℃, the heat transfer medium is nonflammable, the safety performance is high, and the safety problem caused by weak combustibility of R1234yf is solved.
3. The heat transfer medium of the heat pump air conditioning system of the electric automobile has excellent low-temperature heating performance and high-temperature refrigerating performance, and solves the problems that R1234yf is insufficient in low-temperature heating capability, CO2 is better in low-temperature heating capability and poor in high-temperature refrigerating performance.
Detailed Description
The invention will be further illustrated with reference to the following specific examples, without limiting the invention to these specific embodiments. It will be appreciated by those skilled in the art that the invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
The embodiment of the invention mainly provides the preparation of a heat transfer medium, the basic physical property test, the cycle performance test, the material compatibility test and the lubricating oil intersolubility test in the heat pump air conditioning system of the electric automobile.
The heat transfer medium is physically mixed according to the mass ratio of the components to form a stable composition.
Example 1: according to hexafluoropropylene: trifluoroethylene: difluoromethane=50:35:15 mass percent.
Example 2: according to hexafluoropropylene: trifluoroethylene: the fluoropropene=50:40:10 mass percent was physically mixed.
Example 3: according to hexafluoropropylene: trifluoroethylene: difluoromethane=45:37:18 mass percent.
Example 4: according to hexafluoropropylene: trifluoroethylene: difluoromethane=42:39:19 mass percent.
Example 5: according to hexafluoropropylene: trifluoroethylene: difluoromethane=41:40:19 mass percent.
Example 6 hexafluoropropylene: trifluoroethylene: difluoromethane=40:40:20 mass percent.
Example 7 was performed as hexafluoropropylene: trifluoroethylene: difluoromethane=38:42:20 mass percent.
Example 8: according to hexafluoropropylene: trifluoroethylene: difluoromethane: physical mixing was performed with a mass percentage of 2-fluoropropene=41:35:19:5.
Example 9: according to hexafluoropropylene: trifluoroethylene: difluoromethane: physical mixing was performed with 2-fluoropropene=40:30:15:15 mass percent.
Example 10: according to hexafluoropropylene: trifluoroethylene: difluoromethane: physical mixing was performed with a mass percentage of 1, 1-difluoropropene=36:35:19:10.
Comparative example 1: r134a
Comparative example 2: r1234yf
Comparative example 3: R410A
Comparative example 4: R410A disclosed in patent CN108559451B replaces composition R170/R1270/R13I1 (15/63.2/21.6 mass%).
Comparative example 5: R410A replacement composition R290/R600A/R1336mzz-E (50/30/20, mass percent) disclosed in patent CN 113789155A.
Comparative example 6: according to hexafluoropropylene: trifluoroethylene: difluoromethane=70:20:10 mass percent.
Comparative example 7: according to hexafluoropropylene: trifluoroethylene: difluoromethane: physical mixing was performed with 2-fluoropropene=70:20:5:5 mass percent.
1. Basic physical Property test
Basic physical properties of the heat transfer medium of the above examples and comparative examples were studied, and the results are shown in table 1 below:
TABLE 1 basic Properties
Note that: boiling points are calculated averages of the composition bubble point temperature and dew point temperature, and temperature slip is the difference between the composition bubble point temperature and dew point temperature.
As can be seen from Table 1 above, the GWP of the embodiments of the present invention is less than 150, which is much lower than 1530 of R134a and 2088 of R410A, and has better environmental performance; and the boiling point is close to that of R410A, so that the material has the potential of replacing R410A. As can be seen from the comparison of examples with comparative example 2, the boiling point of each example is significantly lower than that of comparative example 2, indicating that the heat transfer medium of each example is more capable of meeting the heating requirements in low temperature environments.
Comparative example 4 and comparative example 5 are both alternative compositions of R410A, but both have too high temperature glide, are not suitable for the electric automobile heat pump air conditioning condition, are prone to leakage, and heat transfer performance is greatly affected once leaked.
Comparative example 6 and comparative example 7 are the same as the composition components provided by the invention, but have different ratio ranges, and both slip too high at a temperature of more than 10 ℃, are not suitable for the working condition of a heat pump air conditioner of an electric automobile, are easy to leak, and have great influence on heat transfer performance once leaking.
2. Cycle performance test
The heat transfer media of the above examples and comparative examples were subjected to a cycle performance study, and the results are shown in table 2 below:
TABLE 2 results of cycle performance test
Note that: refrigeration working condition: the evaporation temperature is 5 ℃, the condensation temperature is 40 ℃, and the supercooling and superheat degrees are 5 ℃; heating working conditions: the evaporation temperature was-20 ℃, the supercooling degree was 5 ℃, and the superheat degree was 10 ℃.
As can be seen from the data in table 2 above, comparing each example with comparative examples 1 and 2, each example of the present invention has significantly higher volume heating capacity and volume cooling capacity, i.e., has more excellent cooling and heating capacity, than the most commonly used working mediums (R134 a and R1234 yf) of the heat pump air conditioning system of the electric vehicle.
As can be seen from comparing each example with comparative example 3, the volume refrigeration capacity, volume heating capacity and energy efficiency of each example were lower than those of R410A, but the levels equivalent to R410A could be reached, especially the heat transfer medium of examples 5 to 7, which had both volume refrigeration capacity and volume heating capacity of greater than 95.4% and 95.8% of R410A, and refrigeration COP and heating COP of greater than 94.7% and 94.3% of R410A, respectively.
The volume refrigeration performance of the comparative example 4 is lower than that of each example, the refrigeration and heating performance of the comparative example 5 is lower than that of each example, and the two are combined to have higher temperature slippage, so that the heat transfer medium is not suitable for being used as an R410A substituted composition, and the heat transfer medium has more excellent comprehensive performance.
Comparative example 6 and comparative example 7 are identical to the composition components provided by the present invention, but differ in the ratio ranges, both of which have significantly lower volumetric refrigeration capacity and volumetric refrigeration capacity than the composition provided by the present invention, and both of which have higher temperature glide in combination, and are unsuitable as R410A substitute compositions.
3. Material compatibility test
With reference to ASHRAE 97-2007 standard of sealed glass tube method for testing chemical stability of materials used in refrigeration systems, compatibility between each example and the materials was studied, the experimental conditions of the nonmetallic materials were 110 ℃ and 14d, the experimental conditions of the metallic materials were 175 ℃ and 14d, and the results of the study are shown in Table 3 below:
TABLE 3 results of Material compatibility studies
Note that: the values in the table are the mass change of the material before and after the experiment.
From table 3 above, it can be seen that the materials of the plastic part, the sealing part and the metal part commonly used in the heat pump air conditioning system of the electric automobile in each embodiment before and after the experiment have good material compatibility, so that the system can be ensured to stably operate for a long time, and the operation and maintenance cost is reduced.
4. Lubricating oil compatibility test
The results of the intersolubility studies of the examples and POE oils of different types are shown in the following Table 4 by referring to SH/T0699 "test method for compatibility of refrigerator oil and refrigerant", and it is known that the heat transfer medium and lubricating oil are clear and transparent at different oil contents (5% -60%) at a temperature of more than-29.6 ℃ with Suniso SL-32S, cryolant RB, suniso T68, danfoss 160sz and CPI RPAG 65, and have good intersolubility.
TABLE 4 results of lubricating oil miscibility studies
Note that: the values in the table are the temperatures and experimental phenomena of the two-phase separation of the examples from the lubricating oil.
Claims (9)
1. An electric automobile heat pump air conditioning system, comprising a heat transfer medium with GWP < 150, a plastic part, a sealing part and a metal part contacted with the heat transfer medium, and lubricating oil compatible with the heat transfer medium under the oil content of 5-60%, which is characterized in that: the heat transfer medium includes:
Hexafluoropropylene as a first component;
trifluoroethylene as a second component;
and a third component selected from at least one of fluoropropenes, difluoropropenes, difluoromethanes.
2. The electric vehicle heat pump air conditioning system according to claim 1, characterized in that: the compatibility coefficient of the plastic piece, the sealing piece and the heat transfer medium is 0.8-0.9 at 100-120 ℃; the compatibility coefficient of the metal piece and the heat transfer medium is 0.9-1 at 150-175 ℃.
3. The electric vehicle heat pump air conditioning system according to claim 2, characterized in that: the material of the plastic part is at least one of epoxy resin, ABS and nylon 66, the material of the sealing part is at least one of natural rubber, butyl rubber, ethylene propylene diene monomer rubber and nitrile rubber, and the material of the metal part is at least one of copper, aluminum and 304 stainless steel.
4. The electric vehicle heat pump air conditioning system according to claim 1, characterized in that: the lubricating oil is a polyol ester (POE) or a polyether lubricating oil (PAG).
5. The electric vehicle heat pump air conditioning system according to any of claims 1-4, wherein: the fluoropropene is at least one selected from E-1-fluoro-1-propylene, Z-1-fluoro-1-propylene, 2-fluoropropene and 3-fluoro-1-propylene; the difluoropropene is at least one selected from 3, 3-difluoro-1-propene, 2, 3-difluoro-1-propene, 1-difluoropropene, (E) -1, 2-difluoro-1-propene, 1, 3-difluoro-1-propene and 1, 2-difluoro-1-propene.
6. The electric vehicle heat pump air conditioning system according to claim 5, wherein: the fluoropropene is selected from 2-fluoropropenes and the difluoropropene is selected from 1, 1-difluoropropenes.
7. The electric vehicle heat pump air conditioning system according to any of claims 1-6, characterized in that:
the first component accounts for 30-50% of the total mass of the heat transfer medium;
the second component accounts for 30-50% of the total mass of the heat transfer medium;
the third component accounts for 10 to 30 percent of the total mass of the heat transfer medium.
8. The electric vehicle heat pump air conditioning system of claim 7, wherein:
The first component accounts for 35-45% of the total mass of the heat transfer medium;
The second component accounts for 35-40% of the total mass of the heat transfer medium;
the third component accounts for 15-25% of the total mass of the heat transfer medium.
9. The electric vehicle heat pump air conditioning system according to claim 7 or 8, characterized in that: the heat transfer medium is used for replacing R410A in the original heat pump air conditioning system of the electric automobile using R410A, and parts of the heat pump air conditioning system do not need to be replaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211381567.9A CN117984721A (en) | 2022-11-04 | 2022-11-04 | Heat pump air conditioning system of electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211381567.9A CN117984721A (en) | 2022-11-04 | 2022-11-04 | Heat pump air conditioning system of electric automobile |
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| Publication Number | Publication Date |
|---|---|
| CN117984721A true CN117984721A (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211381567.9A Pending CN117984721A (en) | 2022-11-04 | 2022-11-04 | Heat pump air conditioning system of electric automobile |
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| Country | Link |
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| CN (1) | CN117984721A (en) |
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