Classifications

• • 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
• • 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
• • 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
  • C09K5/042—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 compounds containing carbon and hydrogen only
• • 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
  • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
  • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
• • 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
  • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
  • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
  • F25B9/004—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being air
• • 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
  • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
  • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
  • F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
• • 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
• • 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
  • C09K2205/40—Replacement mixtures
  • C09K2205/42—Type R12

Definitions

• the present invention relates to a dimethyl ether (hereinafter, referred to
• DME dimethyl methacrylate-butane mixed refrigerantused as a refrigerant (hereinafter, referred to as "R") in steam compression refrigerators and air conditioners, and more particularly to a mixed refrigerant substituted for an R12 (CFC 12) or an R 134a (HFC 134a), which is widely applied to household refrigerators and car air conditioners.
• R refrigerant
• CFC chlorofluorocarbon
• HCFC hydrochloroflu- orocarbon
• Table 1 states environmental potentials of several refrigerants.
• ODPs of the above refrigerants are value in case that the ODP of CFC 11 is set to 1.0.
• GWPs of the above refrigerants are value in case that the GWP of carbon dioxide is set to 1.0 on the basis of 100 years.
• propane, iso-butane, and DME respectively have ODPs of 0.0, and GWPs, which are remarkably lower than those of other refrigerants. Due to the above characteristics, refrigerants, which have ODPs of 0.0, and GWPs being lower than those of CFC12 or HFC134a, are mixed in EU, Japan, and other Asia countries, thereby obtaining desired thermodynamic characteristics, improving efficiency, and increasing interchangeability with oil. Iso-butane and DME are suitable to the above requirements.
• the material In order to use a material as a substitutefor a conventional refrigerant, the material must have a coefficient of performance (hereinafter, referred to as "COP) similar to that of the conventional refrigerant.
• COP coefficient of performance
• the COP means the total refrigerating effect against force applied to a compressor. The higher the COP is, the higher the energy efficiency of a refrigerator or an air conditioner is.
• the substitute refrigerant In order to use the compressor without modifying the compressor, the substitute refrigerant must have a steam pressure similar to that of the conventional refrigerant, and provide a volumetric capacity (hereinafter, referred to as "VC") similar to that of the conventional refrigerant.
• VC volumetric capacity
• the VC means the refrigerating effect per unit volume, and is a factor representing the size of the compressor.
• the VC is in proportion to the steam pressure, and is expressed in terms of kJ/D.
• the substitute refrigerant has a VC similar to that of the conventional refrigerant, a manufacturer can manufacture refrigerators and air conditionerswithout changing or modifying the compressor, thus being advantageous.
• a refrigerant made of a pure material is substituted for the conventional refrigerant, since the substitute refrigeranthas a VC differing from that of the conventional refrigerant, it is necessary to change or modify the compressor and the substitute refrigerant cannot have a COP similar to that of the conventional refrigerant.
• a mixed refrigerant is used.
• Components of the mixed refrigerant are well mixed so that the mixed refrigerant has a COP similar to that of the conventional refrigerant and a VC similarto that of the conventional refrigerant, thereby not requiring the modification of a compressor.
• various mixedrefrigerants which are substituted for CFC 12, have been proposed.
• Some of the above mixed refrigerants contain HCFCs, the use of which was inhibited by the Montreal Protocol, thus not being a suitable substitute for the conventional refrigerant from a long-term point of view.
• the present invention has been made in view of the above problems, and it is an object of the present invention to provide a mixed refrigerant, which has an ODP of 0.0, so as not to influence an ozone layer in the stratosphere, and a GWP lower than those of other conventional substitute refrigerants, and is used as a substitute for CFC12 and HFC134a without modifying the conventional compressor.
• a mixed refrigerant which has an ODP of 0.0, so as not to influence an ozone layer in the stratosphere, and a GWP lower than those of other conventional substitute refrigerants, and is used as a substitute for CFC12 and HFC134a without modifying the conventional compressor.
• a binary mixed refrigerant for refrigerants and air conditioners including 55-99 % by weight of RE170 (dimethyl ether) and 1-45 % by weight of R600a (iso-butane).
• RE170 dimethyl ether
• R600a iso-butane
• the mixed refrigerant of the present invention has an ODP of 0.0 so as not to influence an ozone layer in the stratosphere, thus being more advantageous than CFC 12 and HFC 134a in terms of environmental preservation.
• the mixed refrigerant of the present invention contains DME and iso-butane, which have low ODPs, and reduce the amount of HFC used, thus reducing global warming.
• FIG. 1 is a circuit diagram of a refrigerating system used in a refrigerator or an air conditioner using a refrigerant in accordance with the present invention.
• FIG. 2 is a graph illustrating the relation between a variation of temperature and a variation of the composite ratio of DME and iso-butane of a binary mixed refrigerant. Best Mode for Carrying Out the Invention
• the binary mixed refrigerant of the present invention has an ODP of 0.0 so as not to influence an ozone layer in the stratosphere, and a GWP lower than those of other substitute refrigerants, and is used as a substitute for CFC12 and HFC134a without modifying the conventional compressor.
• the binary mixed refrigerant of the present invention contains
• the binary mixed refrigerant of the present invention has an ODP of 0.0, a GWP lower than those of other substitute refrigerants, and a COP and a VC, which are similar to or higher than those of CFC12 and HFC 134a.
• FIG. 1 is a circuit diagram of a general refrigerating system of a refrigerator or an air conditioner used in the present invention.
• the refrigerating system comprises an evaporator, a condenser, a compressor, and an expansion valve.
• FIG. 1 is a circuit diagram of a general refrigerating system of a refrigerator or an air conditioner used in the present invention.
• the refrigerating system comprises an evaporator, a condenser, a compressor, and an expansion valve.
• Qc represents a direction of the flow of heat in the condenser (refrigerants air)
• Qe represents a direction of the flow of heat in the evaporator (air ⁇ refrigerant)
• TSl represents an inlet temperature of air in the evaporator
• TS7 represents an outlet tem- peratureof air in the evaporator
• TS3 represents an outlet temperature of air in the condenser
• TS 6 represents an inlet temperature of air in the condenser.
• FIG. 2 is a graph illustrating the relation between a variation of temperature and a variation of the composite ratio of DME and iso-butane of the binary mixed refrigerant at a pressure of 15OkPa.
• the composition ratio of a material is expressed by % by weight of arefrigerant having a low boiling point, i.e., a refrigerant having a high steam pressure, according to the international standard agreement.
• Table 2 states indexes of the substitute refrigerant of the present invention and CFC
• VC Volumetric capacity
• GTD Gliding temperature difference
• Tdis Compressor discharge temperature
• COPdiff Difference of COPs between corresponding mixed refrigerant and CFC 12
• VCdiff Difference of VCs between corresponding mixed refrigerant and CFC 12 [40] [41]
• mixed refrigerants of examples 1 to 10 of the present invention have COPs higher than those of CFC 12 and R 134a, while having VCs similar to those of CFC 12 and R 134a.
• the mixed refrigerants of the examples 1 to 10 of the present invention are useful.
• the Tdiss of the mixed refrigerants of the examples 1 to 10 of the present invention are similar to those of CFC 12 and HFC 134a or higher than those of CFC 12 and HFC 134a by 1O 0 C, the mixed refrigerants of the examples 1 to 12 of the present invention are useful also.
• the mixed refrigerants of the examples 1 to lOof the present invention are 0.0, the mixed refrigerants do not destroy an ozone layer, thus being advantageous in terms of environmental preservation, compared to CFC 12 and HFC 134a.
• HFC 134a which has a high GWP, is restricted by the Kyoto Protocol. Accordingly, the mixed refrigerants contain DME and iso-butane, which have low GWPs, reduce the amount of HFC used, thus reducing global warming.
• the GTD of the mixed refrigerant exceeds I 0 C. Accordingly, preferably, the composition ratioof RE 170 in the mixed refrigerant is more than 55 % by weight. Particularly, in accordance with the examples 5 to 10, when the composition ratio of RE170 in the mixed refrigerant is more than 75 % by weight, the GTD of the mixed refrigerant is reduced less than 0.1 0 C, so that the mixed refrigerant has the characteristic of an azeotropic mixed refrigerant similar to a pure refrigerant.
• the mixed refrigerant of the present invention preferably contains 60 to 90 % by weight of RE 170.
• the mixed refrigerants of the examples 2 to 7 of the present invention satisfy the above requirement.
• the mixed refrigerant of the present invention has an ODP of 0.0 so as not to destroy an ozone layer in the stratosphere, thus being more advantageous than CFC12 and HFC 134a in terms of environmental preservation.
• the mixed refrigerant of the present invention contains DME and iso-butane, which have low GWPs, and reduce the amount of HFC used, thus reducing global warming.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Combustion & Propulsion (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Lubricants (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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Citations (3)

• 2005
  • 2005-05-13 KR KR1020050039944A patent/KR100633730B1/ko not_active IP Right Cessation
• 2006
  • 2006-05-04 WO PCT/KR2006/001691 patent/WO2006121261A1/en active Application Filing

Patent Citations (3)

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