CN111019610B - Energy-saving environment-friendly mixed refrigerant with temperature application range of-17 ℃ to-42 DEG C - Google Patents
Energy-saving environment-friendly mixed refrigerant with temperature application range of-17 ℃ to-42 DEG C Download PDFInfo
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- CN111019610B CN111019610B CN201911159446.8A CN201911159446A CN111019610B CN 111019610 B CN111019610 B CN 111019610B CN 201911159446 A CN201911159446 A CN 201911159446A CN 111019610 B CN111019610 B CN 111019610B
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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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- 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
- C09K5/047—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for absorption-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
- 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
- C09K2205/34—The mixture being non-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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses an energy-saving and environment-friendly mixed refrigerant with the temperature application range of-17 ℃ to-42 ℃, which is formed by mixing 91.83 wt% of R218 and 8.17 wt% of R846. The invention has the advantages that: (1) when the mixed refrigerant is used for replacing CFC, the heating performance of the system can be obviously improved, and the structure of the existing equipment is not required to be substantially changed; (2) the mixed refrigerant is a non-azeotropic mixed refrigerant, has temperature slippage in the phase change process, is beneficial to improving the efficiency of heat pump circulation and refrigeration circulation, and is very suitable for the application of a variable temperature heat source; (3) after the R846 is added, the oil solubility of R218 can be increased, and the possibility of leakage of the mixed refrigerant in equipment is reduced to a certain extent; (4) the ODP value of the mixed refrigerant is 0, and the mixed refrigerant has no damage effect on the ozone layer of the atmosphere; (5) the mixed refrigerant can be widely used in heat pumps, air conditioners and refrigeration equipment.
Description
Technical Field
The invention relates to a refrigerant, in particular to an energy-saving and environment-friendly mixed refrigerant with the temperature application range of-17 ℃ to-42 ℃, belonging to the technical field of heat pumps and refrigeration.
Background
In the field of heat pumps and refrigeration, refrigerants are indispensable. With the increasing demand of air conditioners, refrigerators and other equipment, the demand of refrigerants is rapidly increasing, the types of refrigerants are various and have characteristics, and the selection of the refrigerants has important influence on the environment. The Montreal protocol and the Kyoto protocol both specify the ozone depletion potential of Freon and its effect on the greenhouse effect, and also provide corresponding regulations on the emission of ozone-depleting substances (such as chlorofluorocarbons) and carbon dioxide. International attention has been paid to comprehensive evaluation of environmental protection performance of refrigerants in terms of protection of the ozone layer and suppression of global warming. It can be seen that it is important to reduce the Ozone Depletion Potential (ODP) and the Global Warming Potential (GWP).
At present, refrigerants commonly used in air conditioning equipment in China are R410a, R134a, R290, R22 and the like, and refrigerants commonly used in refrigerator equipment are R134a, R600a, R404a and the like, wherein:
(1) r22 is a member of Freon family, and has potential harm to environment, so that the R22 is stopped to be originally installed on new air conditioners and new refrigeration equipment in developed countries such as European Union, Japan, United states and the like, and the service life of R22 in China is 2020 years;
(2) r134a is a substitute of R12 (the thermal performance is very excellent, but the environmental protection performance is relatively poor, and the R134a is eliminated), but the cost of the R134a product is high, and when the R12 is replaced by the product, the original equipment using R12 needs to be greatly modified, so that the manufacturing cost of the whole refrigeration equipment is increased, resources are greatly wasted, and the development trend of R134a is eliminated in the future;
(3) r410a has a GWP value of 1730 although the ODP value is 0;
(4) the ODP values of R290 and R600a are both 0, the GWP values are both 20, the refrigerant is the most environment-friendly refrigerant at present, and the refrigerant is compatible with the traditional lubricating oil, but because R290 and R600a have inflammability, the R290 and R600a are only used in equipment with less liquid filling amount or used as a component of low-temperature mixed refrigerant;
(5) r404a is most widely used in China at present, but belongs to the refrigerant limited by the fluorine-containing gas regulation in Europe, and the research on the replacement technology is particularly urgent.
Currently, the international demand in the air conditioning and refrigeration markets is increasing, and global environmental problems are also sounding alarms to mankind. Therefore, in order to meet the market demand and protect beautiful home at the same time, besides using relatively ideal refrigerants alone, the advantages and disadvantages of each component are combined, the advantages and disadvantages are made good, and the research and development and preparation of novel mixed refrigerants are also a hot problem in the technical field of heat pumps and refrigeration at present.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide the energy-saving environment-friendly mixed refrigerant which has the temperature application range of-17 ℃ to-42 ℃, has obvious energy-saving effect and does not damage the ozone layer of the atmosphere.
In order to achieve the above object, the present invention adopts the following technical solutions:
an energy-saving environment-friendly mixed refrigerant with the temperature application range of-17 ℃ to-42 ℃ is characterized in that the mixed refrigerant is formed by mixing octafluoropropane and sulfur hexafluoride, and the mixing ratio of the octafluoropropane and the sulfur hexafluoride is as follows by mass percent:
octafluoropropane 91.83%
8.17 percent of sulfur hexafluoride.
The invention has the advantages that:
(1) experimental data show that when the mixed refrigerant is used for replacing CFC, along with the increase of the heat exchange quantity of a heat regenerator, although the power consumption of a compressor is increased by 30.3%, the heating quantity of a system is increased by 85.5%, the heating coefficient is increased by 41.7%, the heating performance is obviously improved, and the energy-saving effect is obvious;
(2) the mixed refrigerant is a non-azeotropic mixed refrigerant, has temperature slippage in the phase change process, can reduce the heat transfer temperature difference in the phase change process of an evaporator and a condenser, further reduces the heat transfer irreversible loss of a heat exchanger, is beneficial to improving the efficiency of heat pump circulation and refrigeration circulation, and is very suitable for the application of a temperature-variable heat source;
(3) generally, the fluorocarbon is incompatible with lubricating oil, the oil quantity needs to be strictly regulated when the working medium is selected, and after sulfur hexafluoride is added into the fluorocarbon, the oil solubility of octafluoropropane can be increased, so that the possibility of leakage of the mixed refrigerant in equipment is reduced to a certain extent;
(4) the ODP value of the mixed refrigerant is 0, the mixed refrigerant has no damage effect on the ozone layer of the atmosphere, and the environment performance is higher;
(5) the temperature application range of the mixed refrigerant is-17 ℃ to-42 ℃, and the mixed refrigerant can be widely used in heat pumps, air conditioners and refrigeration equipment;
(6) when the mixed refrigerant is used for replacing CFC, only the flow of the expansion part of the existing heat pump, air conditioner and refrigeration equipment in the current market is required to be changed, and the structure of the existing equipment is not required to be substantially changed, so that the reconstruction cost of the existing equipment is relatively low.
Drawings
FIG. 1 is a saturated vapor pressure curve of the mixed refrigerant and its components provided by the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
The mixed refrigerant provided by the invention takes octafluoropropane (R218) and sulfur hexafluoride (R846) as raw materials, and the ODP values of the octafluoropropane (R218) and the sulfur hexafluoride (R846) are both 0. Generally, the fluorocarbon is incompatible with lubricating oil, the oil quantity is strictly regulated when the working medium is selected, and after the R846 is added into the R218, the oil solubility of the R218 can be increased, so that the possibility of leakage of the mixed refrigerant in equipment is reduced to a certain extent.
In the invention, the mixing ratio of R218 and R846 is selected by an experimental data analysis method, specifically:
weighing R218 and R846, performing 36 groups of experiments in the regenerative mixed working medium throttling heat pump system according to different mass ratios, and then combining experimental data with refrigerant physical property parameters inquired through refprep 9.0 to find out the optimal ratio of R218 to R846.
Finally, the optimal ratio of R218 and R846 we obtain is:
R218 91.83％
R846 8.17％。
subsequently, we measured the basic parameters of the mixed refrigerant (91.83% R218+ 8.17% R846) as follows:
TABLE 3 basic parameters of mixed refrigerants
As can be seen from Table 3, the mixed refrigerant is ideal in thermodynamic properties, environmental protection properties and safety properties.
Then, a saturated vapor pressure curve is made for the mixed refrigerant and each component of the mixed refrigerant, and the change relation of the saturated vapor pressure curve P along with the temperature T comprises the important thermophysical properties of the working medium, such as normal boiling point, eccentricity factor, polarity, latent heat, critical parameter, compression factor and the like. The results are shown in FIG. 1.
As can be seen from fig. 1, the mixed refrigerant and the R218 saturated vapor pressure curve are very close, so that the system structure does not need to be substantially changed when the new mixed refrigerant is used for replacing the R218 refrigeration system.
Because the mixed refrigerant shows the characteristics of wet working medium, a heat regenerator is required to be arranged, so that the operation of the compressor in a superheat region can be ensured. Although the addition of the regenerator increases the cost of equipment modification, the improvement in thermal economy is far greater than the cost of equipment modification.
When the mixed refrigerant is used, the influence of temperature slippage is required to be considered in the type selection of the heat exchanger, otherwise, the normal heat exchanger allowance cannot be ensured, and a heat regenerator can be arranged to improve the performance of the whole system. The heat exchanger sealing performance is high due to the non-azeotropic characteristic. Experimental data show that when the mixed refrigerant is used for replacing CFC, along with the increase of the heat exchange quantity of the heat regenerator, the power consumption of a compressor is increased by 30.3%, the heating quantity of a system is increased by 85.5%, the heating coefficient is increased by 41.7%, the heating performance is obviously improved, and the energy-saving effect is obvious.
It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the protection scope of the present invention.
Claims (1)
1. An energy-saving environment-friendly mixed refrigerant with the temperature application range of-17 ℃ to-42 ℃ is characterized in that the mixed refrigerant is formed by mixing octafluoropropane and sulfur hexafluoride, and the mixing ratio of the octafluoropropane and the sulfur hexafluoride is as follows by mass percent:
octafluoropropane 91.83%
8.17 percent of sulfur hexafluoride.
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| CN111019610B true CN111019610B (en) | 2021-05-04 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0676459A1 (en) * | 1993-09-29 | 1995-10-11 | Cooperative "Elegaz" | Working mixture for refrigeration equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050029492A1 (en) * | 2003-08-05 | 2005-02-10 | Hoshang Subawalla | Processing of semiconductor substrates with dense fluids comprising acetylenic diols and/or alcohols |
| US7736529B2 (en) * | 2007-10-12 | 2010-06-15 | Honeywell International Inc | Azeotrope-like compositions containing sulfur hexafluoride and uses thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0676459A1 (en) * | 1993-09-29 | 1995-10-11 | Cooperative "Elegaz" | Working mixture for refrigeration equipment |
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