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US20180051198A1 - Fluid composition, refrigerant composition and air conditioner - Google Patents

Fluid composition, refrigerant composition and air conditioner Download PDF

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Publication number
US20180051198A1
US20180051198A1 US15/784,897 US201715784897A US2018051198A1 US 20180051198 A1 US20180051198 A1 US 20180051198A1 US 201715784897 A US201715784897 A US 201715784897A US 2018051198 A1 US2018051198 A1 US 2018051198A1
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United States
Prior art keywords
component
fluid composition
air conditioner
refrigerant
burning velocity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US15/784,897
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English (en)
Inventor
Hidekazu Okamoto
Hiroki HAYAMIZU
Katsuya Ueno
Hirokazu Takagi
Masato Fukushima
Kenji Takizawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Institute of Advanced Industrial Science and Technology AIST
AGC Inc
Original Assignee
Asahi Glass Co Ltd
National Institute of Advanced Industrial Science and Technology AIST
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Filing date
Publication date
Application filed by Asahi Glass Co Ltd, National Institute of Advanced Industrial Science and Technology AIST filed Critical Asahi Glass Co Ltd
Assigned to ASAHI GLASS COMPANY, LIMITED, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY reassignment ASAHI GLASS COMPANY, LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAKAGI, HIROKAZU, TAKIZAWA, KENJI, UENO, KATSUYA, FUKUSHIMA, MASATO, HAYAMIZU, Hiroki, OKAMOTO, HIDEKAZU
Publication of US20180051198A1 publication Critical patent/US20180051198A1/en
Assigned to AGC Inc. reassignment AGC Inc. CHANGE OF NAME Assignors: ASAHI GLASS COMPANY, LIMITED
Priority to US16/683,872 priority Critical patent/US11827831B2/en
Abandoned legal-status Critical Current

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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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a fluid composition, a refrigerant composition and an air conditioner.
  • Alkanes, halogenated alkanes, alkenes and halogenated alkenes which can become a gas or a liquid depending upon conditions such as pressure, etc. are used refrigerants, solvents, blowing agents, cleaning agents, etc.
  • alkanes, halogenated alkanes, alkenes and halogenated alkenes are often flammable, and therefore, at the time of their use, it is necessary to have restrictions or measures in order to inhibit combustion.
  • Patent Document 1 JP-A-2002-98391
  • Patent Document 2 JP-A-2002-98393
  • Patent Document 3 JP-A-6-101913
  • Patent Document 4 JP-A-2003-133000
  • the present invention is to provide a fluid composition and a refrigerant composition having flammability suppressed, and an air conditioner in which restrictions in order to inhibit combustion of the refrigerant composition are reduced and it is thereby possible to omit or simplify measures for inhibiting combustion of the refrigerant composition.
  • the present inventors have made extensive studies on the composition of the fluid composition, and, as a result, have found that in a combination of a component selected from the group consisting of alkanes, halogenated alkanes and alkenes, and a component selected from the group consisting of halogenated alkenes, or in a combination of components selected from the group consisting of halogenated alkenes, there is a specific combination where the measured value of the burning velocity is significantly lower than the estimated value of the burning velocity.
  • the present invention has the following embodiments.
  • a fluid composition being a composition (I) comprising at least one component (A) selected from the group consisting of alkanes (which may, if having two or more carbon atoms, have an etheric oxygen atom), halogenated alkanes (which may, if having two or more carbon atoms, have an etheric oxygen atom) and alkenes (which may, if having three or more carbon atoms, have an etheric oxygen atom), and at least one component (B) selected from halogenated alkenes (which may, if having three or more carbon atoms, have an etheric oxygen atom), or a composition (II) (excluding the composition (I)) comprising at least two components (B) selected from halogenated alkenes (which may, if having three or more carbon atoms, have an etheric oxygen atom), wherein
  • the combustion inhibiting effect as defined by the following formula (1) is at least 10%
  • S u,blend,calc ( ⁇ ) is an estimated value of the burning velocity in each equivalence ratio ⁇
  • n is the number of types of combustible components contained in the fluid composition
  • S u,i ( ⁇ ) is the measured value of the burning velocity of the i-th combustible component
  • ⁇ i is the energy fraction of the i-th combustible component obtainable by the following formula (3).
  • ⁇ H c,i is the heat of combustion of the i-th combustible component
  • x i is the mole fraction of the i-th combustible component.
  • component (A) is a component selected from the group consisting of C 1-3 alkanes (which may, if having two or more carbon atoms, have an etheric oxygen atom), C 1-3 halogenated alkanes (which may, if having two or more carbon atoms, have an etheric oxygen atom) and C 2-3 alkenes (which may, if having three or more carbon atoms, have an etheric oxygen atom).
  • component (A) is a component selected from the group consisting of a C 1 or 2 alkane (which may, if having two or more carbon atoms, have an etheric oxygen atom), a C 1 or 2 halogenated alkane (which may, if having two or more carbon atoms, have an etheric oxygen atom) and a C 2 alkene.
  • component (A) is a component selected from the group consisting of difluoromethane, fluoromethane, methane, 1,1,1-trifluoroethane, 1,1,2-trifluoroethane, 1,1-difluoroethane, 1,2-difluoroethane, fluoroethane, ethane, 1,1,1,3,3-pentafluorobutane, trifluoromethyl methyl ether, pentafluoroethyl methyl ether, heptafluoropropyl methyl ether, 1,1,2,2-tetrafluoroethoxymethane, dichloromethane, chloromethane, 1,1-dichloroethane, 1,2-dichloroethane, chloroethane, 1,1-dichloro-1-fluoroethane and 1-chloro-1,1-difluoroethane.
  • component (A) is a component selected from the group consisting of difluo
  • the maximum value among measured values of the burning velocity in each equivalence ratio of the component (B) is at least 1 cm/sec.
  • a refrigerant composition comprising the fluid composition as defined in any one of [1] to [9].
  • the air conditioner according to [11] which is a floor type air conditioner wherein an indoor unit housing a part of said refrigeration cycle, is installed on the floor in a room.
  • the air conditioner according to [11] which is an air conditioner for an automobile.
  • the fluid composition and refrigerant composition of the present invention become ones having flammability suppressed.
  • the air conditioner of the present invention is such that restrictions in order to inhibit combustion of the refrigerant composition are reduced, and it is thereby possible to omit or simplify measures for inhibiting combustion of the refrigerant composition.
  • FIG. 1 is a schematic diagram showing an example of an air conditioner.
  • FIG. 2 is a schematic diagram showing an apparatus for measuring the burning velocity.
  • FIG. 3 is an example of an image showing the state of a flame in a cylindrical vessel, as photographed by a high-speed video camera of the apparatus in FIG. 2 .
  • a “fluid” is a general term for a gas and a liquid.
  • An “equivalence ratio” is a ratio of the mixing ratio (combustible component/air) of a combustible component to air in a mixed gas as an object for measurement or estimation of the burning velocity, to the mixing ratio (combustible component/air) in the stoichiometric mixed gas.
  • the “stoichiometric mixed gas” is a mixed gas of a combustible component and air, which contains oxygen in an amount just enough for complete combustion of the combustible component.
  • a “combustible component” is a component, of which a mixed gas with air, has a flammable range.
  • a “flammable range” is a range of the mixing ratio of the combustible component to air, in which the mixed gas becomes flammable.
  • a “refrigerant” is a compound that can be vaporized and liquefied in a refrigeration cycle.
  • a “halogenated alkane” is a compound having some or all of hydrogen atoms in an alkane substituted by halogen atoms.
  • halogenated alkene is a compound having some or all of hydrogen atoms in an alkene substituted by halogen atoms.
  • a “partially fluorinated alkane” is a compound having some of hydrogen atoms in an alkane substituted by fluorine atoms.
  • a “partially fluorinated alkene” is a compound having some of hydrogen atoms in an alkene substituted by fluorine atoms.
  • etheric oxygen atom is an oxygen atom forming an ether bond (—O—) between carbon-carbon atoms.
  • the fluid composition of the present invention is the following composition (I) or the following composition (II), wherein the combustion inhibiting effect to be described later is at least 10%.
  • composition (I) comprises at least one of the following component (A) and at least one of the following component (B).
  • Component (A) component selected from the group consisting of alkanes (which may, if having two or more carbon atoms, contain an etheric oxygen atom), halogenated alkanes (which may, if having two or more carbon atoms, contain an etheric oxygen atom) and alkenes (which may, if having three or more carbon atoms, contain an etheric oxygen atom).
  • Component (B) component selected from halogenated alkenes (which may, if having three or more carbon atoms, contain an etheric oxygen atom).
  • component (A) from the viewpoint of having a preferred boiling point as a refrigerant, solvent, blowing agent or cleaning agent, preferred is a component selected from the group consisting of a C 1-6 alkane, a C 1-6 halogenated alkane and a C 2-6 alkene.
  • a component selected from the group consisting of a C 1-3 alkane, a C 1-3 halogenated alkane and a C 2 or 3 alkene is particularly preferred is a component selected from the group consisting of a C 1 or 2 alkane, a C 1 or 2 halogenated alkane and a C 2 alkene.
  • component (A) one having a global warming potential (GWP) of at most 1,000 is preferred, and a component selected from the group consisting of alkanes and partially fluorinated alkanes, is preferred. Since such component (A) is often flammable, by combining it with component (B), it is possible to suppress the global warming potential and to suppress the flammability, whereby effects of the present invention will be sufficiently exhibited.
  • GWP global warming potential
  • the alkanes include methane, ethane, propane, butane, isobutane, pentane, isopentane, neopentane, cyclopentane, hexane, cyclohexane, dimethyl ether, ethyl methyl ether, diethyl ether, etc.
  • the alkane one type may be used alone, or two or more types may be used in combination.
  • alkane from such a viewpoint that the effects of the present invention can be sufficiently exhibited when combined with component (B), methane or ethane is preferred, and methane is more preferred.
  • the halogen atom in a halogenated alkane may, for example, be a fluorine atom, a chlorine atom, a bromine atom or the like, and from the viewpoint of less impact on the ozone layer, a fluorine atom is preferred.
  • the halogenated alkanes include difluoromethane (HFC-32), fluoromethane (HFC-41), pentafluoroethane (HFC-125), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,1-trifluoroethane (HFC-143a), 1,1,2-trifluoroethane (HFC-143), 1,1-difluoroethane (HFC-152a), 1,2-difluoroethane (HFC-152), fluoroethane (HFC-161), 1,1,1,3,3-pentafluorobutane (HFC-365mfc), trifluoromethyl methyl ether (HFE-143a), pentafluoroethyl methyl ether, heptafluoropropyl methyl ether, 1,1,2,2-tetrafluoroethoxy methane,
  • halogenated alkane from such a viewpoint that the effects of the present invention are sufficiently exhibited when combined with component (B), preferred is at least one member selected from the group consisting of HFC-32, HFC-41, HFC-143a, HFC-143, HFC-152a, HFC-152, HFC-161, HFC-365mfc, HFE-143a, pentafluoroethyl methyl ether, heptafluoropropyl methyl ether, 1,1,2,2-tetrafluoroethoxymethane, dichloromethane, chloromethane, 1,1-dichloroethane, 1,2-dichloroethane, chloroethane, HCFC-141b and HCFC-142b.
  • the alkenes include known compounds, such as ethylene, propylene, etc.
  • the alkene one type may be used alone, or two or more types may be used in combination.
  • component (B) from the viewpoint of having a preferred boiling point as a refrigerant, solvent, blowing agent or cleaning agent, preferred is a component consisting of a C 2-5 halogenated alkene. Among them, more preferred is a component consisting of a C 2 or 3 halogenated alkene.
  • component (B) from such a viewpoint that it is easy to suppress combustion of the fluid composition, preferred is one wherein the number of hydrogen atoms is at most the number of halogen atoms.
  • component (B) from the viewpoint of less impact on the ozone layer and less impact on global warming, a component consisting of a partially fluorinated alkene is preferred.
  • the halogen atom in a halogenated alkene may, for example, be a fluorine atom, a chlorine atom, a bromine atom or the like, and from the viewpoint of less impact on the ozone layer, a fluorine atom is preferred.
  • the halogenated alkenes include tetrafluoroethylene (PFO-1114), 1,1,2-trifluoroethylene (HFO-1123), cis-1,2-difluoroethylene (HFO-1132 (Z)), trans-1,2-difluoroethylene (HFO-1132 (E)), 1,1-difluoroethylene (HFO-1132a), vinyl fluoride (HFO-1141), tetrachloroethylene, 1,1,2-trichloroethylene, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, 1,1-dichloroethylene, vinyl chloride, chlorotrifluoroethylene (CFO-1113), 1,1-dichloro-2,2-difluoroethylene (CFO-1112a), cis-1,2-dichloro-1,2-difluoroethylene (CFO-1112 (Z)), trans-1,2-dichloro-1,2-difluoroethylene (CFO-1112 (E)), cis-1-chlor
  • halogenated alkene from such a viewpoint that the effects of the present invention can be sufficiently exhibited when combined with component (A), preferred is at least one member selected from the group consisting of PFO-1114, HFO-1123, HFO-1132 (Z), HFO-1132 (E), HFO-1132a, HFO-1141, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, 1,1-dichloroethylene, vinyl chloride, CFO-1113, HCFO-1131a, cis-1-chloro-2-fluoroethylene, trans-1-chloro-2-fluoroethylene, PFO-1216, HFO-1225ye, HFO-1234yf, HFO-1234ze (Z), HFO-1234ze (E) and HFO-1243zf.
  • Component (A) and component (B) are selected so that the combustion inhibiting effect of the composition (I) having them combined, would be at least 10%.
  • Preferred combinations of component (A) and component (B) include the following combinations.
  • the mixing ratio of component (A) to component (B) is adjusted to be such a ratio that the combustion inhibiting effect of the composition (I) would be at least 10%.
  • the proportion of HFO-1123 is, in a range of from 0.5-99.5 vol % wherein the combustion inhibiting effect appears, preferably from 5 to 85 vol % wherein the combustion inhibiting effect would be at least 10%, more preferably from 15 to 70 vol % wherein the combustion inhibiting effect would be at least 20%.
  • the proportion of HFO-1123 is, in a range of from 55 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 63 to 90 vol % wherein the combustion inhibiting effect would be at least 10%, more preferably from 70 to 85 vol % wherein the combustion inhibiting effect would be at least 20%.
  • the proportion of PFO-1114 is, in a range of from 0.5 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 3 to 90 vol % wherein the combustion inhibiting effect would be at least 10%, more preferably from 7 to 85 vol % wherein the combustion inhibiting effect would be at least 20%.
  • the proportion of PFO-1114 is, in a range of from 35 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 36 to 90 vol % wherein the combustion inhibiting effect would be at least 10%.
  • the proportion of PFO-1114 is, in a range of from 52 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 53 to 78 vol % wherein the combustion inhibiting effect would be at least 10%.
  • the proportion of PFO-1114 is, in a range of from 0.5 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 1 to 90 vol % wherein the combustion inhibiting effect would be at least 10%.
  • the proportion of PFO-1114 is, in a range of from 36 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 39 to 85 vol % wherein the combustion inhibiting effect would be at least 10%.
  • the proportion of PFO-1114 is, in a range of from 26 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 42 to 90 vol % wherein the combustion inhibiting effect would be at least 10%.
  • the proportion of PFO-1114 is, in a range of from 0.5 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 5 to 90 vol % wherein the combustion inhibiting effect would be at least 10%.
  • the proportion of CFO-1113 is, in a range of from 40 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 50 to 85 vol % wherein the combustion inhibiting effect would be at least 10%.
  • composition (II) comprises at least two components (B) (excluding the composition (I)).
  • component (B) As the component (B), the same ones as described as component (B) in the composition (I) may be mentioned, and its preferred embodiments are also the same.
  • At least two components (B) are selected so that the combustion inhibiting effect of the composition (II) having them combined, would be at least 10%.
  • Preferred combinations of at least two components (B), include the following combinations.
  • the mixing ratio of at least two components (B) is adjusted to be such a ratio that the combustion inhibiting effect of the composition (II) would be at least 10%.
  • the proportion of HFO-1123 is, in a range of from 25 to 99.5 vol % wherein the combustion inhibiting effect appears, preferably from 30 to 80 vol % wherein the combustion inhibiting effect would be at least 10%, more preferably from 40 to 70 vol % wherein the combustion inhibiting effect would be at least 20%.
  • the fluid composition may contain component(s) other than the component (A) and the component (B), in a range not to impair the effects of the present invention.
  • the ratio (halogen atoms/hydrogen atoms) of the total number of halogen atoms to the total number of hydrogen atoms, in compounds in the components (A) and (B) contained in the composition is preferably at least 1.0, more preferably at least 1.03, further preferably at least 1.06.
  • the combustion inhibiting effect of the fluid composition is defined by the following formula (1).
  • S u,max,blend is the maximum value (hereinafter referred to also as the measured maximum burning velocity) among measured values of the burning velocity in each equivalence ratio
  • S u,max,blend,calc is the maximum value (hereinafter referred to also as the estimated maximum burning velocity) among estimated values of the burning velocity in each equivalence ratio obtainable by the following formula (2),
  • S u,blend,calc ( ⁇ ) is an estimated value of the burning velocity in each equivalence ratio ⁇
  • n is the number of types of combustible components contained in the fluid composition
  • S u,i ( ⁇ ) is the measured value of the burning velocity of the i-th combustible component
  • ⁇ i is the energy fraction of the i-th combustible component obtainable by the following formula (3)
  • ⁇ H c,i is the heat of combustion of the i-th combustible component
  • X i is the mole fraction of the i-th combustible component
  • the formula (2) is a Le Chatelier's formula having the mixing ratio replaced by the energy fraction (see Reference 1).
  • the formula (2) can express the burning velocity accurately with respect to a fluid composition wherein each flammable component shows no chemical interaction.
  • a similar formula has already been adopted in the legislation of Japan (see Reference 2).
  • the heat of combustion in the formula (3) is represented by the difference between the sum of the enthalpies of formation of products in the formation system in the combustion reaction formula and the enthalpy of formation of the compound in the reaction system.
  • the enthalpy of formation is described in Chemical Handbook, International Standards (see Reference 3), various handbooks, etc. With respect to an absolutely new compound, it can be obtained by the Benson group additivity rule (see Reference 4) or the computational chemistry techniques.
  • the concept of the combustion reaction formula of a compound containing halogen is defined in international standards (see References 3 and 5).
  • the combustion inhibiting effect of the fluid composition is at least 10%, preferably at least 20%, more preferably at least 30%.
  • the burning velocity is inversely proportional to one-third power of the energy required for ignition (the minimum ignition energy). That is, the fact that the burning velocity decreases by 30%, means that the minimum ignition energy becomes larger by 3 times, and the possibility of ignition decreases correspondingly, whereby it is possible to more simplify measures against static electricity or the ignition source such as an electrical outlet.
  • the measured maximum burning velocity of component (A) is preferably at least 1 cm/sec, more preferably at least 5 cm/sec, further preferably at least 10 cm/sec.
  • the measured maximum burning velocity of component (B) is preferably at least 1 cm/sec, more preferably at least 5 cm/sec.
  • the measured maximum burning velocity of each component being at least the lower limit value in the above range, indicates that flammability of each component is high.
  • such an unpredictable effect is exhibited that despite the combination of highly combustible components (A) and highly combustible component (B), it is possible to obtain a fluid composition having its flammability suppressed.
  • the fluid composition of the present invention is used as a refrigerant composition, a solvent composition, a blowing agent composition, a cleaning agent composition, or the like.
  • a refrigerant composition a solvent composition, a blowing agent composition, a cleaning agent composition, or the like.
  • a refrigerant composition of the present invention is made of the fluid composition of the present invention.
  • the refrigerant composition of the present invention comprises, as a refrigerant, at least one following component (A) and at least one following component (B), or at least two components (B).
  • the refrigerant composition may contain component(s) other than the components (A) and (B) in a range not to impair the effects of the present invention.
  • Such other components include a refrigerant other than the components (A) and (B), a stabilizer, a leak detection material, etc.
  • Specific examples of such other components include an alcohol, ammonia, carbon dioxide, etc.
  • the total proportion of the component (A) and the component (B) is, in the total (100 mass %) of the refrigerant, preferably from 60 to 100 mass %, more preferably from 70 to 100 mass %, further preferably from 80 to 100 mass %, particularly preferably from 90 to 100 mass %, and most preferably 100 mass %.
  • the proportion of another refrigerant is, in the total (100 mass %) of the refrigerant, preferably from 0 to 40 mass %, more preferably 0 to 30 mass %, further preferably from 0 to 20 mass %, particularly preferably from 0 to 10 mass %, most preferably 0 mass %.
  • a stabilizer is a component to improve stability of the refrigerant against heat and oxidation.
  • the stabilizer may, for example, be an oxidation resistance improving agent, a heat resistance improving agent, a metal deactivator, etc.
  • the amount of the stabilizer to be added may be within a range not to substantially reduce the effects of the present invention, and is, in the total (100 parts by mass) of the refrigerant, preferably at most 5 parts by mass, more preferably at most 1 part by mass.
  • the leak detection material may, for example, be an ultraviolet fluorescent dye, an odorous gas, an odor masking agent, etc.
  • a solubilizing agent to enhance the solubility of the leak detection material in the refrigerant may be used.
  • the amount of the leak detection material to be added may be within a range not to substantially reduce the effects of the present invention, and is, in the total (100 parts by mass) of the refrigerant, preferably at most 2 parts by mass, more preferably at most 0.5 part by mass.
  • the air conditioner of the present invention is an air conditioner having the refrigerant composition of the present invention sealed in a refrigeration cycle.
  • a vapor compression refrigeration cycle is employed.
  • the vapor compression refrigeration cycle is constituted by connecting a compressor and a condenser, the condenser and a pressure reducing mechanism, the pressure reducing mechanism and an evaporator, and the evaporator and the compressor, respectively, by piping.
  • other component(s) than the refrigerant composition may be sealed.
  • Other components include a refrigerating machine oil for the compressor, a drying agent, etc.
  • the refrigerating machine oil may, for example, be an oxygen-containing synthetic oil (an ester type synthetic oil, an ether type synthetic oil, etc.), a fluorinated synthetic oil, a hydrocarbon type synthetic oil, a mineral oil, etc.
  • an oxygen-containing synthetic oil an ester type synthetic oil, an ether type synthetic oil, etc.
  • a fluorinated synthetic oil a hydrocarbon type synthetic oil, a mineral oil, etc.
  • the ester type synthetic oil may, for example, be a dibasic acid ester oil, a polyol ester oil, a complex ester oil, a polyol carbonate ester oil, etc.
  • the ether type synthetic oil may, for example, be a polyvinyl ether oil, a polyoxyalkylene type synthetic oil, etc.
  • the fluorinated synthetic oil may, for example, be one obtained by substituting hydrogen atoms of a synthetic oil by fluorine atoms, a perfluoropolyether oil, a fluorinated silicone oil, etc.
  • the hydrocarbon type synthetic oil may, for example, be a poly ⁇ -olefin, an alkylbenzene, an alkylnaphthalene, etc.
  • the mineral oil may, for example, be a paraffinic mineral oil, a naphthenic mineral oil, etc.
  • refrigerating machine oil one type may be used alone, or two or more types may be used in combination.
  • the refrigerating machine oil from the viewpoint of compatibility with the refrigerant composition, preferred is a polyol ester oil or a polyglycol oil, and from such a viewpoint that a significant antioxidant effect is obtainable by the stabilizer, particularly preferred is a polyalkylene glycol oil.
  • the sealed amount of the refrigerating machine oil may be within a range not to substantially reduce the effects of the present invention, and although it may vary also depending on the application, the format of the compressor, etc., it is preferably from 10 to 100 parts by mass, more preferably from 20 to 50 parts by mass, based on the refrigerant composition (100 parts by mass).
  • the drying agent may, for example, be silica gel, activated alumina, zeolite, etc.
  • a zeolite type drying agent is preferred from the viewpoint of the chemical reactivity of the drying agent and the refrigerant, and the moisture absorption capability of the drying agent.
  • the size of the zeolite type drying agent is preferably from 0.5 to 5 mm, since if it is too small, clogging in a valve or a narrow portion of piping tends to be caused, and if it is too large, the drying capacity tends to be reduced. As the shape, granular or cylindrical is preferred.
  • the amount of the zeolite type drying agent to be sealed is not particularly limited.
  • FIG. 1 is a schematic diagram showing an example of an air conditioner.
  • An air conditioner 1 comprises a compressor 11 to compress a refrigerant, a four-way valve 12 for switching between a refrigerant circuit during cooling operation and a refrigerant circuit during heating operation, an outdoor heat exchanger 13 to exchange the heat of the refrigerant and the heat of the outdoor air, an expansion valve 14 to decompress the refrigerant, an indoor heat exchanger 15 to exchange the heat of the refrigerant and the heat of the indoor air, an outdoor blower (not shown) to blow outdoor air to the outdoor heat exchanger 13 , an indoor blower (not shown) to blow indoor air to the indoor heat exchanger 15 , and a control unit (not shown) to control overall operation of the air conditioner 1 .
  • the refrigeration cycle 10 in the air conditioner 1 is constituted, in the case of cooling operation, by switching the four-way valve 12 to the solid line side, to connect the compressor 11 and the outdoor heat exchanger 13 (condenser) via the four-way valve 12 by a first pipe 21 and a second pipe 22 , to connect the outdoor heat exchanger 13 (condenser) and the expansion valve 14 (pressure reducing mechanism) by a third pipe 23 , to connect the expansion valve 14 (pressure reducing mechanism) and the indoor heat exchanger 15 (evaporator) by a fourth pipe 24 , and to connect the indoor heat exchanger 15 (evaporator) and the compressor 11 via the four-way valve 12 by a fifth pipe 25 and a sixth pipe 26 .
  • the refrigeration cycle 10 in the air conditioner 1 is constituted, in the case of heating operation, by switching the four-way valve 12 to the broken line side, to connect the compressor 11 and the indoor heat exchanger 15 (condenser) via the four-way valve 12 by the first pipe 21 and the fifth pipe 25 , to connect the indoor heat exchanger 15 (condenser) and the expansion valve 14 (pressure reducing mechanism) by the fourth pipe 24 , to connect the expansion valve 14 (pressure reducing mechanism) and the outdoor heat exchanger 13 (evaporator) by the third pipe 23 , and to connect the outdoor heat exchanger 13 (evaporator) and the compressor 11 via the four-way valve 12 by the second pipe 22 and the sixth pipe 26 .
  • the compressor 11 In the air conditioner 1 , the compressor 11 , the four-way valve 12 , the outdoor heat exchanger 13 , the expansion valve 14 , the first pipe 21 , the second pipe 22 , the third pipe 23 , the sixth pipe 26 and an outdoor blower (not shown) are accommodated in the outdoor unit 2 .
  • the indoor heat exchanger 15 In the air conditioner 1 , the indoor heat exchanger 15 , an indoor air blower (not shown) and a control unit (not shown) are accommodated in the indoor unit 3 .
  • the fourth pipe 24 and the fifth pipe 25 constitute communication pipes for communicating the outdoor unit 2 and the indoor unit 3 .
  • the four-way valve 12 is switched to the solid line side.
  • the refrigerant compressed by the compressor 11 becomes a high-temperature and high-pressure gas refrigerant, which is then sent to the outdoor heat exchanger 13 .
  • the outdoor heat exchanger 13 condenser
  • the gas refrigerant undergoes heat exchange with outdoor air to release heat and be condensed to become a high-pressure liquid refrigerant, which is then sent to the expansion valve 14 .
  • the expansion valve 14 pressure reducing mechanism
  • the liquid refrigerant is depressurized and becomes a low-temperature low-pressure gas-liquid two-phase refrigerant, which is then fed to the indoor heat exchanger 15 .
  • the gas-liquid two-phase refrigerant undergoes heat exchange with indoor air to absorb heat and be evaporated to become a gas refrigerant, which is then returned to the compressor 11 .
  • Indoor air having heat-exchanged with the refrigerant in the indoor heat exchanger 15 is cooled.
  • the four-way valve 12 is switched to the broken line side.
  • the refrigerant compressed by the compressor 11 becomes a high-temperature and high-pressure gas refrigerant which is then sent to the indoor heat exchanger 15 .
  • the indoor heat exchanger 15 (condenser)
  • the gas refrigerant undergoes heat exchange with indoor air to release heat and is condensed to become a high-pressure liquid refrigerant, which is then sent to the expansion valve 14 .
  • the indoor air having heat-exchanged with the refrigerant in the indoor heat exchanger 15 is heated.
  • the liquid refrigerant is depressurized and becomes a low-temperature low-pressure gas-liquid two-phase refrigerant, which is then sent to the outdoor heat exchanger 13 .
  • the outdoor heat exchanger 13 evaporator
  • the gas-liquid two-phase refrigerant undergoes heat exchange with outdoor air to absorb heat and is evaporated to become a gas refrigerant, which is then returned to the compressor 11 .
  • the air conditioner of the present invention is not limited to the air conditioner of the illustrated example.
  • the air conditioner of the illustrated example is a heat pump type air conditioner capable of switching between cooling operation and heating operation
  • the air conditioner of the present invention may be an air conditioner for cooling only, or it may be an air conditioner for heating only.
  • the heat exchanger is not limited to the refrigerant-air heat exchanger and may be a refrigerant-liquid heat exchanger.
  • the decompression mechanism is not limited to the expansion valve and may be a capillary tube or the like.
  • the air conditioner of the present invention may be any of a home air conditioner, a business air conditioner or an automotive air conditioner.
  • the connection mode of the indoor unit may be either integral type, separate type or multi-type.
  • the mounting installation mode of the indoor unit may be either floor-standing type, wall-hanging type, ceiling-hanging type, ceiling cassette type, built-in type or embedding type.
  • the air conditioner of the present invention employs a refrigerant composition having flammability suppressed and thus, even if the refrigerant leaks from the indoor unit, is safe as compared with a conventional air conditioner employing a highly flammable refrigerant.
  • the air conditioner of the present invention is suitable for applications to install the indoor unit in the vicinity of the floor or in a closed narrow space where the refrigerant is likely to accumulate.
  • the air conditioner of the present invention is suitable for a floor-standing type air conditioner wherein the indoor unit accommodating a portion of the refrigeration cycle is installed on the floor in a room, or suitable for an automotive air conditioner.
  • the air conditioner of the present invention is suitable for a business air conditioner (such as a multi air conditioner for buildings) in which the amount of the refrigerant to be charged, is large.
  • the air conditioner of the present invention employs a refrigerant composition having flammability suppressed, also for a recovery apparatus for recovering the refrigerant from the air conditioner, it is not necessary to particularly provide a combustion inhibiting function, and therefore, it is possible to use a known recovery apparatus.
  • the refrigerant composition sealed in the refrigeration cycle is a refrigerant composition of the present invention having flammability suppressed, whereby restrictions in order to inhibit combustion of the refrigerant composition is reduced, and measures for inhibiting combustion of the refrigerant composition may be omitted or simplified.
  • the filling amount of the refrigerant sealed in the refrigeration cycle can be increased as compared with a conventional air conditioner employing a highly flammable refrigerant.
  • the air conditioner of the present invention it is possible to omit or simplify various measures (such as providing a gas leak sensor, providing a ventilator to the indoor unit, preventing sparks from electrical equipment or electrical wiring of the unit, etc.) required in a conventional air conditioner employing a highly flammable refrigerant.
  • a burning velocity was measured by visualizing a flame of a mixture of a gas to be measured and air in a closed vessel by using the closed vessel, by the Schlieren visualization method (Schlieren method: ASHRAE Research PJ RP-1583, Appendix E), and directly observing and photographing it by a high-speed video camera.
  • the burning velocity measuring apparatus 30 comprises a xenon lamp 31 being a Schlieren light source, a first plane mirror 32 , a first concave mirror 33 , a cylindrical vessel 34 , a second plane mirror 35 , a second concave mirror 36 , a third plane mirror 37 , a ring filter 38 and a high-speed video camera 39 .
  • Light from the xenon lamp 31 is reflected by the first plane mirror 32 toward the first concave mirror 33 .
  • the light is reflected by the first concave mirror 33 and becomes parallel light, which passes through the cylindrical vessel 34 disposed coaxially with the parallel light, and is reflected by the second plane mirror 35 toward the second concave mirror 36 .
  • the light is reflected by the second concave mirror 36 and becomes a convergent beam, which is reflected by the third plane mirror 37 , then passes through the ring filter 38 disposed at the focal point of the Schlieren image and is photographed by the high speed video camera 39 .
  • the xenon lamp 31 one having a convex lens 40 and a pinhole 41 disposed in front of the lamp body, was used.
  • cylindrical vessel 34 a cylindrical vessel (inner diameter 155 mm ⁇ length 200 mm) having an internal volume of 3.8 L and provided with a temperature control means and stirring blades, was used which was provided with transparent acrylic windows 42 at openings at both ends, and had a pair of electrodes 43 (inter-electrode distance 5 ⁇ 10 ⁇ 3 m) inserted at the center.
  • the high speed video camera 39 As the high speed video camera 39 , a high-speed CCD video camera (photographing 1,000 images per second) was used.
  • the gas to be measured one having a purity of at least 99.8% was used.
  • a gas to be measured and dry air were introduced into the cylindrical vessel 34 so that they would be in a predetermined equivalence ratio, followed by stirring for about 10 minutes to prepare a mixed gas of the gas to be measured and air with the predetermined equivalence ratio.
  • the temperature in the cylindrical vessel 34 was adjusted to be within a range of 25.0 ⁇ 2.0° C. by the temperature adjusting function of the cylindrical vessel 34 .
  • the burning velocity can be approximated by the following equation (4).
  • S u is the burning velocity
  • r f is the flame radius
  • ⁇ u is the gas density in the unburned region
  • ⁇ b is the gas density in the burned region.
  • the mixed gas was prepared by filling HFC-32 and HFO-1123 in a container having an inner volume of 2 L, which was preliminarily evacuated to at most 1.333 Pa, and adjusting the mixing ratio by measuring the masses of the respective components by an electronic balance.
  • the mixed gas was prepared a total of 5 times, whereby the measuring error of the mixing ratio was within ⁇ 0.2 mass %.
  • ⁇ u of the mixed gas was obtained assuming ideal gas, and ⁇ b was obtained by adiabatic equilibrium calculation.
  • the burning velocity of the mixed gas was measured at various equivalence ratios, to obtain the measured maximum burning velocity.
  • the estimated value of the burning velocity in each equivalence ratio was obtained from the formula (2), to obtain the estimated maximum burning velocity.
  • the measured maximum burning velocity, the estimated maximum burning velocity and the combustion inhibiting effect obtained from the formula (1) are shown in Table 1.
  • the measured maximum burning velocity, the estimated maximum burning velocity and the combustion inhibiting effect were obtained in the same manner as in Ex. 1 except that component (A), component (B), and their mole fractions were changed as shown in Table 1 and the air used for the measurement of the burning velocity was changed to an air with an oxygen concentration ratio of 29.8%.
  • the results are shown in Table 1 and Table 2.
  • the combustion inhibiting effect of the fluid composition of the present invention is one caused by the fact that the mechanisms for combustion reaction of the components (A) and (B) are quite different.
  • the reaction proceeds by the following two types of reactions.
  • combustion proceeds by an exothermic reaction due to self-decomposition of the halogenated alkene being component (B).
  • component (A) being polyatomic molecules
  • the component (A) acts as a diluent, whereby the self-decomposition combustion reaction by the component (B) is suppressed.
  • combustion of the component (A) proceeds.
  • This combustion reaction is a usual radical chain reaction, and its rate is determined by a chain branching reaction of hydrogen atoms, oxygen atoms and OH radicals which are chain-carrying species.
  • This burning velocity is known to be proportional to the concentration of hydrogen atoms present in the reaction zone of the flame.
  • the hydrogen-halogen binding energy is very strong, and therefore, if a halogen is introduced into the reaction zone of the flame, a very stable hydrogen halide will be formed by the combustion reaction, and hydrogen being the active species is excluded from the reaction system, whereby it is possible to suppress the radical chain reaction.
  • component (B) a highly reactive halogenated alkene having the number of halogen atoms excessively relative to the number of hydrogen atoms, it is possible to supply a large amount of halogen atoms to the combustion reaction system, and to substantially reduce the concentration of hydrogen atoms in the flame, whereby it is possible to suppress the radical chain reaction by the component (A).
  • the component (A) may be a compound having any flammability. Therefore, from the viewpoint of less impact on global warming, it is preferred to select one having low GWP as the component (A).
  • the component (B) is preferably one having halogen atoms excessively to satisfy this condition as a mixture.
  • the fluid composition of the present invention is useful as a refrigerant composition, a solvent composition, a blowing agent composition, a cleaning agent composition, etc.

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