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
  • 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
  • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
  • C09K2205/10—Components
  • C09K2205/12—Hydrocarbons
  • C09K2205/126—Unsaturated fluorinated 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
  • C09K2205/22—All components of a mixture being fluoro compounds

Definitions

• the present invention relates to heat transfer fluids adapted for use in countercurrent heat exchangers.
• Fluorocarbon-based fluids are widely used in vapor compression heat transfer systems, including air conditioning, heat pump, refrigeration or freezing devices. These devices have in common to rely on a thermodynamic cycle comprising the vaporization of the fluid at low pressure (in which the fluid absorbs heat); compressing the vaporized fluid to a high pressure; condensing the vaporized fluid into a high pressure liquid (in which the fluid emits heat); and the expansion of the fluid to complete the cycle.
• the vapor compression heat transfer systems comprise at least two heat exchangers, one in which the fluid vaporizes, and the other in which it condenses.
• the heat exchangers may be of co-current or counter-current type.
• a heat transfer fluid which may be a pure compound or a mixture of compounds
• thermodynamic properties of the fluid and on the other hand by additional constraints.
• a particularly important criterion is that of the impact of the fluid considered on the environment.
• chlorinated compounds chlorofluorocarbons and hydrochlorofluorocarbons
• non-chlorinated compounds such as hydrofluorocarbons, fluoroethers and fluoroolefins are now generally preferred.
• HFC-134a Currently used heat transfer fluids are HFC-134a, R404a (ternary mixture of 52% HFC-143a, 44% HFC- 125 and 4% HFC-134a), R407c (ternary mixture of 52% HFC-134a, 25% HFC-125 and 23% HFC-32) and R410a (binary mixture of 50% HFC-32 and 50% HFC-125).
• WO 2007/002625 discloses compositions based on fluoroolefins, especially HFO-1234yf or HFO-1234ze, in various uses, and especially as heat transfer fluids. The document does not specify the type of heat exchanger used.
• WO 2007/126414 generally describes a wide variety of fluoroolefin compositions and a wide variety of uses of these compositions. The document does not specify the type of heat exchanger used.
• US 2009/0158771 discloses the use of a ternary mixture comprising HFC-32, HFC-134a and HFO-1243zf, in a heat transfer application.
• the coefficients of performance obtained are lower than those of the fluid taken for reference, namely HFC-134a.
• the type of heat exchanger used is not specified.
• WO 2009/150763 discloses an air conditioning apparatus with a countercurrent type heat exchanger, wherein the heat transfer fluid is a mixture of HFO-1234 and HFC-32 or HFC-41.
• WO 2010/000993 discloses the use of a ternary mixture comprising HFO-1234yf, HFC-32 and HFC-134a as a heat transfer fluid. The document does not specify the type of heat exchanger used.
• WO 2010/000994 discloses the use of a ternary mixture comprising HFO-1234yf, HFC-32 and HFC-152a as a heat transfer fluid.
• the document does not specify the type of heat exchanger used.
• the invention firstly relates to a ternary composition comprising difluoromethane, 3,3,3-trifluoropropene and a hydrocarbon-based compound having at least two fluorine atoms and having a boiling point of between -30 and -18. ° C, which is selected from 1,1-difluoroethane, 2,3,3,3-tetrafluoropropene and 1,3,3,3-tetrafluoropropene.
• the composition comprises difluoromethane, 1,1-difluoroethane and 3,3,3-trifluoropropene, and preferably comprising from 2 to 96% of difluoromethane, from 2 to 96% of
• difluoromethane from 60 to 96% of difluoromethane, from 2 to 20% of 1,1-difluoroethane and from 2 to 20% of 3,3,3-trifluoropropene, ideally from 80 to 90% of difluoromethane, from 5 to 15% of 1,1-difluoroethane and 5 to 15% 3,3,3-trifluoropropene; or
• difluoromethane from 50 to 96% of difluoromethane, from 2 to 30% of 1,1-difluoroethane and from 2 to 30% of 3,3,3-trifluoropropene, preferably from 65 to 80% of difluoromethane, from 5 to 25% of 1,1-difluoroethane and 5 to 30% 3,3,3-trifluoropropene.
• the composition comprises difluoromethane, 3,3,3-trifluoropropene and 2,3,3,3-tetrafluoropropene, preferably from 2 to 96% of difluoromethane, from 2 to 96% of 3 , 3,3-trifluoropropene and from 2 to 96% of 2,3,3,3-tetrafluoropropene, and particularly preferably:
• the composition comprises difluoromethane, 3,3,3-trifluoropropene and 1, 3,3,3-tetrafluoropropene, preferably from 2 to 96% of difluoromethane, from 2 to 96% of 3, 3,3-trifluoropropene and from 2 to 96% of 1,3,3,3-tetrafluoropropene, and particularly preferably:
• difluoromethane from 50% to 96% of difluoromethane, from 2% to 50% of 3,3,3-trifluoropropene and from 2% to 50% of 1,1,3,3,3-tetrafluoropropene, and preferably from 65% to 90% of difluoromethane; 30% 3,3,3-trifluoropropene and 5 to 30% 1,3,3,3-tetrafluoropropene; or
• the composition comprises from 75 to 98% of difluoromethane, from 1 to 9% of 1,1-difluoroethane and from 1 to 23% of 3,3,3-trifluoropropene.
• the composition comprises from 70 to 98% of difluoromethane, from 1 to 23% of 3,3,3-trifluoropropene and from 1 to 28% of 2,3,3,3-tetrafluoropropene. According to another embodiment, the composition comprises from 75 to 98% of difluoromethane, from 1 to 23% of 3,3,3-trifluoropropene and from 1 to 10% of 1,3,3,3-tetrafluoropropene.
• the invention also relates to the use of the aforementioned composition as a heat transfer fluid in a vapor compression circuit.
• the vapor compression circuit comprises a countercurrent heat exchanger.
• the invention also relates to a heat transfer composition
• a heat transfer composition comprising the aforementioned composition as a heat transfer fluid, and one or more additives selected from lubricants, stabilizers, surfactants, tracer agents, fluorescers, agents and the like. odorants, solubilising agents and mixtures thereof.
• the invention also relates to a heat transfer installation comprising a vapor compression circuit containing the aforementioned composition as a heat transfer fluid or containing the aforementioned heat transfer composition.
• the installation comprises a countercurrent heat exchanger.
• the installation is chosen from mobile or stationary heat pump heating, air conditioning, refrigeration and freezing installations.
• the invention also relates to a method for heating or cooling a fluid or a body by means of a vapor compression circuit containing a heat transfer fluid, said method comprising successively the evaporation of the transfer fluid. of heat, compression of the heat transfer fluid, condensation of the heat medium and expansion of the heat transfer fluid, wherein the heat transfer fluid is the composition according to the invention.
• the above-mentioned method is a method of cooling a fluid or a body, wherein the temperature of the cooled fluid or body is from -40 ° C to -10 ° C, and preferably from -35 ° C to -25 ° C, more preferably -30 ° C to -20 ° C, and wherein the heat transfer fluid comprises:
• difluoromethane from 50% to 96% of difluoromethane, from 2% to 50% of 3,3,3-trifluoropropene and from 2% to 50% of 1,1,3,3,3-tetrafluoropropene, and preferably from 65% to 90% of difluoromethane; 30% 3,3,3-trifluoropropene and 5 to 30% 1,3,3,3-tetrafluoropropene; or
• the above-mentioned method is a method of cooling a fluid or a body, wherein the temperature of the cooled fluid or body is -15 ° C to 15 ° C, and preferably -10 ° C to 10 ° C, more preferably -5 ° C to 5 ° C, and wherein the heat transfer fluid comprises:
• the above-mentioned method is a method of heating a fluid or a body, wherein the temperature of the fluid or heated body is from 30 ° C to 80 ° C, and preferably At 55 ° C, more preferably from 40 ° C to 50 ° C, and wherein the heat transfer fluid comprises:
• difluoromethane from 50 to 96% of difluoromethane, from 2 to 30% of 1,1-difluoroethane and from 2 to 30% of 3,3,3-trifluoropropene, preferably from 65 to 80% of difluoromethane, from 5 to 25% of 1,1-difluoroethane and 5 to 30% 3,3,3-trifluoropropene; or
• the invention also relates to a method for reducing the environmental impact of a heat transfer installation comprising a vapor compression circuit containing an initial heat transfer fluid, said method comprising a step of replacing the heat transfer fluid.
• initial heat in the vapor compression circuit by a final transfer fluid the final transfer fluid having a GWP lower than the initial heat transfer fluid, wherein the final heat transfer fluid is a composition according to the invention.
• the initial heat transfer fluid is a ternary mixture of 52% of 1, 1, 1-trifluoroethane, 44% of pentafluoroethane and 4% of 1, 1 , 1,2-tetrafluoroethane or a ternary mixture of 52% 1,1,1,2-tetrafluoroethane, 25% pentafluoroethane and 23% difluoromethane
• the final heat transfer fluid comprises:
• the initial heat transfer fluid is a binary mixture of 50% difluoromethane and 50% pentafluoroethane
• the final heat transfer fluid comprises:
• difluoromethane from 60 to 96% of difluoromethane, from 2 to 20% of 1,1-difluoroethane and from 2 to 20% of 3,3,3-trifluoropropene, ideally from 80 to 90% of difluoromethane, from 5 to 15% of 1,1-difluoroethane and 5 to 15% 3,3,3-trifluoropropene; or
• difluoromethane from 50 to 96% of difluoromethane, from 2 to 30% of 1,1-difluoroethane and from 2 to 30% of 3,3,3-trifluoropropene, preferably from 65 to 80% of difluoromethane, from 5 to 25% of 1,1-difluoroethane and 5 to 30% 3,3,3-trifluoropropene; or
• difluoromethane from 50% to 96% of difluoromethane, from 2% to 50% of 3,3,3-trifluoropropene and from 2% to 50% of 1,1,3,3,3-tetrafluoropropene, and preferably from 65% to 90% of difluoromethane; 30% 3,3,3-trifluoropropene and 5 to 30% 1,3,3,3-tetrafluoropropene; or
• the initial heat transfer fluid is 1, 1, 1, 2, 2-tetrafluoroethane
• the final heat transfer fluid comprises:
• the initial heat transfer fluid is difluoromethane
• the final heat transfer fluid comprises:
• the present invention overcomes the disadvantages of the state of the art. It provides more particularly heat transfer fluids having a relatively low GWP, and having good energy performance, especially in applications using countercurrent heat exchangers.
• HFO-1243zf HFC-32
• HFO-1234yf HFO-1234ze
• HFC-152a has a boiling point of -24 ° C
• HFO-1234yf has a boiling point of -29 ° C
• HFO-1234ze has a boiling point of -19 ° C.
• the ternary mixtures above have the particularity of having good energy performance, especially with counter-current heat exchangers.
• the invention also has one or preferably more of the advantageous features listed below.
• the heat transfer fluids of the invention have a higher coefficient of performance than the reference refrigerants R404a, R407c, HFC-134a, HFC-32 and R410a in applications involving a countercurrent heat exchanger. In some cases, the capacity of the heat transfer fluids is greater than or equal to that of the reference refrigerants, in these same applications.
• the invention makes it possible to reduce the GWP of existing systems comprising one of the reference refrigerants above, and this without degrading the performance of these systems, and on the contrary by improving them to a large extent, and by replacing the reference refrigerants by the heat transfer fluids of the invention.
• the heat transfer fluids of the invention have a higher coefficient of performance than the HFO-1243zf / HFC-134a / HFC-32 mixture as implemented in the document US 2009/0158771.
• the heat transfer fluids of the invention are less flammable and / or more effective than those used in WO 2009/150763.
• the global warming potential is defined with respect to carbon dioxide and with respect to a duration of 100 years, according to the method indicated in "The scientific assessment of ozone depletion, 2002, a report of the World Meteorological Association's Global Ozone Research and Monitoring Project.
• heat transfer compound or “heat transfer fluid” (or refrigerant) is meant a compound, respectively a fluid, capable of absorbing heat by evaporating at low temperature and low pressure and to reject heat by condensing at high temperature and high pressure, in a vapor compression circuit.
• a heat transfer fluid may comprise one, two, three or more than three heat transfer compounds.
• heat transfer composition is meant a composition comprising a heat transfer fluid and optionally one or more additives which are not heat transfer compounds for the intended application.
• the heat transfer method according to the invention is based on the use of an installation comprising a vapor compression circuit which contains a heat transfer fluid.
• the heat transfer process may be a method of heating or cooling a fluid or a body.
• the vapor compression circuit containing a heat transfer fluid comprises at least one evaporator, a compressor, a condenser and an expander, as well as heat transfer fluid transport lines between these elements.
• Evaporator and condenser comprise a heat exchanger allowing a heat exchange between the heat transfer fluid and another fluid or body.
• a compressor it is possible to use in particular a centrifugal compressor with one or more stages or a mini centrifugal compressor.
• Rotary, piston or screw compressors can also be used.
• the compressor may be driven by an electric motor or by a gas turbine (eg powered by vehicle exhaust, for mobile applications) or by gearing.
• the facility may include a turbine to generate electricity (Rankine cycle).
• the installation may also optionally include at least one coolant circuit used to transmit the heat (with or without change of state) between the heat transfer fluid circuit and the fluid or body to be heated or cooled.
• the installation may also optionally include two or more vapor compression circuits containing identical or different heat transfer fluids.
• the vapor compression circuits may be coupled together.
• the vapor compression circuit operates in a conventional vapor compression cycle.
• the cycle comprises changing the state of the heat transfer fluid from a liquid phase (or two-phase liquid / vapor) to a vapor phase at a relatively low pressure, and then compressing the fluid in the vapor phase to a relatively high pressure. high, the change of state (condensation) of the heat transfer fluid from the vapor phase to the liquid phase at a relatively high pressure, and the reduction of the pressure to restart the cycle.
• Cooling processes include air conditioning processes (with mobile installations, for example in vehicles, or stationary), refrigeration and freezing or cryogenics.
• heat is transferred (directly or indirectly via a heat transfer fluid) from the heat transfer fluid, during the condensation thereof, to the fluid or to the body that is heating, and this at a relatively high temperature compared to the environment.
• heat pump The installation for implementing the heat transfer is called in this case "heat pump”.
• the invention provides that the cooling and heating processes, and the corresponding facilities, comprise a countercurrent heat exchanger, either the condenser or the evaporator.
• the heat transfer fluids according to the invention are particularly effective with countercurrent heat exchangers.
• both the evaporator and the condenser comprise a countercurrent heat exchanger.
• countercurrent heat exchanger is understood to mean a heat exchanger in which heat is exchanged between a first fluid and a second fluid, the first fluid at the inlet of the exchanger exchanging heat with the second fluid at the outlet of the exchanger, and the first fluid at the outlet of the exchanger exchanging heat with the second fluid at the inlet of the exchanger.
• countercurrent heat exchangers include devices in which the flow of the first fluid and the flow of the second fluid are in opposite or almost opposite directions.
• the exchangers operating in cross current mode with countercurrent tendency are also included among the countercurrent heat exchangers within the meaning of the present application.
• HFC-134a 1, 1, 1, 2-tetrafluoroethane
• HFC-143a 1,1,1-trifluoroethane
• HFC-125 pentafluoroethane
• HFC-152a 1,1-difluoroethane
• HFO-1234ze 1, 3,3,3-tetrafluoropropene
• HFO-1234yf 2,3,3,3-tetrafluoropropene
• HFO-1243zf 3,3,3-trifluoropropene.
• the heat transfer fluids used in the invention are the following ternary mixtures:
• Compositions 2) and 3) have the advantage of being less flammable than those described in WO 2009/150763.
• ternary mixture is meant a composition consisting essentially of the three compounds mentioned, that is to say in which the three compounds mentioned represent at least 99% (preferably at least 99.5% or even at least 99.9%). %) of the composition.
• HFO-1234ze can be in cis or trans form or be a mixture of these two forms.
• each compound may be present preferably in an amount of from 1 to 99%, and especially from 1 to 96%.
• composition 1 for the composition 1): from 20 to 70% of HFC-32, from 2 to 30% of HFC-152a and from 2 to 78% of HFO-1243zf, and preferably from 25 to 65% of HFC-32, from 2 to 15% of HFC-152a and from 20 to 78% of HFO-1243zf;
• composition 2 for the composition 2): from 5 to 70% of HFO-1234yf, from 20 to 60% of HFC-32 and from 2 to 75% of HFO-1243zf, and preferably from 10 to 70% of HFO-1234yf, from 25 to 50% HFC-32 and from 2 to 65% HFO-1243zf; and
• composition 3 from 25 to 70% of HFC-32, from 2 to 70% of HFO-1243zf and from 5 to 73% of HFO1234ze, and preferably from
• composition 1 for the composition 1): from 60 to 96% of HFC-32, from 2 to 20% of HFC-152a and from 2 to 20% of HFO-1243zf, and preferably from 80 to 90% of HFC-32, from 5 to 15% HFC-152a and from 5 to 15% HFO-1243zf;
• composition 2 from 2 to 40% of HFO-1234yf, from 58 to 90% of HFC-32 and from 2 to 40% of HFO-1243zf, and preferably from 5 to 30% of HFO-1234yf, from 65 to 80% HFC-32 and from 2 to 15% HFO-1243zf; and
• composition 3 from 50 to 96% of HFC-32, from 2 to 50% of
• HFO-1243zf and 2 to 50% HFO1234ze and preferably 65 to 90% HFC-32, 5 to 30% HFO-1243zf and 5 to 30% HFO-1234ze.
• the temperature of the fluid or of the cooled body is from -15 ° C. to 15 ° C., preferably from -10 ° C. to 10 ° C., more preferably from -5 ° C to 5 ° C (ideally about 0 ° C), as well as
• a moderate temperature that is to say those in which the temperature of the fluid or of the heated body is from 30 ° C. to 80 ° C., and preferably from 35 ° C. to 55 ° C., more particularly preferably from 40 ° C to 50 ° C (ideally about 45 ° C),
• compositions replacing HFC-134a are the following:
• composition 1 for the composition 1): from 2 to 20% of HFC-32, from 2 to 85% of HFC-152a and from 2 to 90% of HFO-1243zf, and preferably from 5 to 15% of HFC-32, from 5 to 85% HFC-152a and from 10 to 90% HFO-1243zf;
• composition 2 for the composition 2): from 5 to 75% of HFO-1234yf, from 2 to 20% of HFC-32 and from 2 to 90% of HFO-1243zf, and preferably from 5 to 75% HFO-1234yf, 5 to 15% HFC-32 and 10 to 90% HFO-1243zf; and
• composition 3 for the composition 3): from 2 to 25% of HFC-32, from 2 to 90% of HFO-1243zf and from 5 to 96% of HFO1234ze, and preferably from 5 to 25% of HFC-32; at 90% HFO-1243zf and 5 to 90% HFO-1234ze.
• the temperature of the fluid or of the cooled body is from -15 ° C. to 15 ° C., preferably from -10 ° C. to 10 ° C., more preferably from -5 ° C to 5 ° C (ideally about 0 ° C), as well as
• a moderate temperature that is to say those in which the temperature of the fluid or of the heated body is from 30 ° C. to 80 ° C., and preferably from 35 ° C. to 55 ° C., more particularly preferably from 40 ° C to 50 ° C (ideally about 45 ° C),
• compositions in placement of R404a or R407c are as follows:
• composition 1 for the composition 1): from 20 to 60% of HFC-32, from 2 to 70% of HFC-152a and from 2 to 70% of HFO-1243zf, and preferably from 25 to 40% of HFC-32, from 5 to 65% of HFC-152a and from 5 to 70% of HFO-1243zf;
• composition 2 for the composition 2): from 5 to 80% of HFO-1234yf, from 20 to 50% of HFC-32 and from 2 to 75% of HFO-1243zf, and preferably from 5 to 65% of HFO-1234yf, 25 to 35% HFC-32 and 2 to 70% HFO-1243zf; and
• composition 3 for the composition 3): from 20 to 65% of HFC-32, from 2 to 70% of HFO-1243zf and from 5 to 78% of HFO1234ze, and preferably from 25 to 50% of HFC-32; at 70% HFO-1243zf and 5 to 70% HFO-1234ze.
• processes for cooling at a moderate temperature that is to say those in which the temperature of the fluid or of the cooled body is from -15 ° C. to 15 ° C., preferably from -10 ° C. to 10 ° C., more preferably from -5 ° C to 5 ° C (ideally about 0 ° C), as well as processes for heating at a moderate temperature, that is to say those in which the temperature of the fluid or of the heated body is from 30 ° C. to 80 ° C., and preferably from 35 ° C. to 55 ° C., more particularly preferably from 40 ° C to 50 ° C (ideally about 45 ° C),
• compositions replacing R410a are as follows:
• composition 1 for the composition 1): from 50 to 96% of HFC-32, from 2 to 30% of HFC-152a and from 2 to 30% of HFO-1243zf, and preferably from 65 to 80% of HFC-32, 5 to 25% of HFC-152a and 5 to 30% of
• composition 2 for the composition 2): from 2 to 30% of HFO-1234yf, from 60 to 90% of HFC-32 and from 2 to 30% of HFO-1243zf, and preferably from 5 to 25% of HFO-1234yf, from 65 to 80% HFC-32 and from 5 to 30% HFO-1243zf; and
• composition 3 for the composition 3): from 50 to 96% of HFC-32, from 2 to 48% of HFO-1243zf and from 2 to 30% of HFO1234ze, and preferably from 65 to 90% of HFC-32, of at 30% HFO-1243zf and 5 to 30% HFO-1234ze.
• composition 2 for the composition 2): from 2 to 30% of HFO-1234yf, from 68 to 96% of HFC-32 and from 2 to 20% of HFO-1243zf, and preferably from 8 to 23% of HFO-1234yf, 75 to 90% HFC-32 and 2 to 10% HFO-1243zf.
• the temperature of the fluid or of the cooled body is from -15 ° C. to 15 ° C., preferably from -10 ° C. to 10 ° C., more preferably from -5 ° C to 5 ° C (ideally about 0 ° C), as well as
• a moderate temperature that is to say those in which the temperature of the fluid or of the heated body is from 30 ° C. to 80 ° C., and preferably from 35 ° C. to 55 ° C., way more preferably from 40 ° C to 50 ° C (ideally about 45 ° C),
• compositions replacing HFC-32 are the following:
• composition 2 for the composition 2): from 2 to 40% of HFO-1234yf, from 58 to 90% of HFC-32 and from 2 to 40% of HFO-1243zf, and preferably from 2 to 23% of HFO-1234yf, 75 to 90% HFC-32 and 2 to 18% HFO-1243zf.
• compositions used for the replacement of HFC-32 have the advantage not only of improved performance, but also of a lower compressor outlet temperature, which decreases heat loss, facilitates compression and decreases the mechanical compressive stresses.
• the inlet temperature of the heat transfer fluid to the evaporator is preferably from -45 ° C. to -15 ° C., especially from -40 ° C. at -20 ° C, more preferably -35 ° C to -25 ° C and for example about -30 ° C; and the temperature of the onset of condensation of the heat transfer fluid at the condenser is preferably 25 ° C to 80 ° C, especially 30 ° C to 60 ° C, more preferably 35 ° C to 55 ° C C and for example about 40 ° C.
• the inlet temperature of the heat transfer fluid to the evaporator is preferably from -20 ° C to 10 ° C, especially from -15 ° C to 5 ° C, more preferably from -10 ° C to 0 ° C and for example about -5 ° C; and the temperature of the onset of condensation of the heat transfer fluid at the condenser is preferably 25 ° C to 80 ° C, especially 30 ° C to 60 ° C, more preferably 35 ° C to 55 ° C C and for example about 50 ° C.
• These processes can be refrigeration or air conditioning processes.
• the inlet temperature of the heat transfer fluid to the evaporator is preferably from -20 ° C to 10 ° C, especially from -15 ° C to 5 ° C, more preferably from -10 ° C to 0 ° C and for example about -5 ° C; and the temperature of the onset of condensation of the heat transfer fluid at the condenser is preferably 25 ° C to 80 ° C, especially 30 ° C to 60 ° C, more preferably 35 ° C to 55 ° C C and for example about 50 ° C.
• the mixtures having the following formulations are almost azeotropic mixtures:
• HFC-32 from 75 to 98% of HFC-32, from 1 to 9% of HFC-152a and from 1 to 23% of HFO-1243zf;
• HFC-32 from 75 to 98% of HFC-32, from 1 to 23% of HFO-1243zf and from 1 to 10% of HFO-1234ze.
• Heat transfer fluids that are not quasi-azeotropic, however, are very effective when properly coupled to a countercurrent heat exchanger (with a temperature difference with the second, approximately constant fluid). in the exchanger).
• Each above heat transfer fluid may be mixed with one or more additives to provide the heat transfer composition effectively flowing in the vapor compression circuit.
• the additives may especially be chosen from lubricants, stabilizers, surfactants, tracer agents, fluorescent agents, odorants, solubilizing agents and mixtures thereof.
• the stabilizer (s), when present, preferably represent at most 5% by weight in the heat transfer composition.
• the stabilizers there may be mentioned in particular nitromethane, ascorbic acid, terephthalic acid, azoles such as tolutriazole or benzotriazole, phenol compounds such as tocopherol, hydroquinone, t-butyl hydroquinone, 2,6-di-tert-butyl-4-methylphenol, epoxides (optionally fluorinated or perfluorinated alkyl or alkenyl or aromatic) such as n-butyl glycidyl ether, hexanediol diglycidyl ether, allyl glycidyl ether, butylphenylglycidyl ether, phosphites, phosphonates, thiols and lactones.
• Lubricants that may be used include oils of mineral origin, silicone oils, paraffins, naphthenes, synthetic paraffins, alkylbenzenes, poly-alpha olefins, polyalkene glycols, polyol esters and / or polyvinyl ethers. .
• tracer agents which can be detected
• the tracer agent is different from the one or more heat transfer compounds composing the heat transfer fluid.
• solubilizing agents mention may be made of hydrocarbons, dimethyl ether, polyoxyalkylene ethers, amides, ketones, nitriles, chlorocarbons, esters, lactones, aryl ethers, fluoroethers and magnesium compounds. 1-trifluoroalkanes.
• the solubilizing agent is different from the one or more heat transfer compounds composing the heat transfer fluid.
• fluorescent agents mention may be made of naphthalimides, perylenes, coumarins, anthracenes, phenanthracenes, xanthenes, thioxanthenes, naphthoxanhthenes, fluoresceins and derivatives and combinations thereof.
• alkyl acrylates As odorants, mention may be made of alkyl acrylates, allyl acrylates, acrylic acids, acrylresters, alkyl ethers, alkyl esters, alkynes, aldehydes, thiols, thioethers, disulfides, allyl isothiocyanates and alkanoic acids.
• amines, norbornenes, norbornene derivatives, cyclohexene, heterocyclic aroma compounds ascaridol, o-methoxy (methyl) phenol and combinations thereof.
• compositions according to the invention may also be useful as an expansion agent, aerosol or solvent.
• Example 1 Method for calculating the properties of heat transfer fluids in the various configurations envisaged
• the RK-Soave equation is used to calculate densities, enthalpies, entropies and vapor-liquid equilibrium data of mixtures.
• the use of this equation requires knowledge of the properties of the pure bodies used in the mixtures in question and also the interaction coefficients for each binary.
• the necessary data for each pure body are the boiling temperature, the critical temperature and the critical pressure, the pressure versus temperature curve from the boiling point to the critical point, the densities of saturated liquid and saturated steam as a function of temperature.
• the temperature-pressure curve data of the HFOs are measured by the static method.
• the critical temperature and the critical pressure are measured by a C80 calorimeter marketed by Setaram.
• the saturation densities as a function of temperature are measured by the vibrating tube densimeter technology developed by the laboratories of the autoimmune des Mines de Paris.
• the RK-Soave equation uses binary interaction coefficients to represent the behavior of products in mixtures.
• the coefficients are calculated based on the experimental vapor equilibrium data.
• the technique used for liquid vapor equilibrium measurements is the analytical static cell method.
• the balance cell includes a sapphire tube and is equipped with two electromagnetic ROLSITM samplers. It is immersed in a cryothermostat bath (HUBER HS40). Variable speed rotary field driving magnetic stirring is used to accelerate equilibrium attainment.
• the analysis of the samples is carried out by chromatography (HP5890 seriesll) in the gas phase using a katharometer (TCD).
• liquid vapor equilibrium measurements on the HFC-32 / HFO-1234yf binary are carried out for the following isotherms: 70 ° C., 30 ° C., -10 ° C.
• the liquid vapor equilibrium data for the HFC-152a / HFC-32 binary is available under Refprop. Two isotherms (-20 ° C and 20 ° C) and two isobars (1 bar and 25 bar) are used to calculate the interaction coefficients for this binary.
• the liquid vapor equilibrium measurements on the HFC-32 / HFO-1243zf binary are carried out for the following isotherms: -15 ° C and 0 ° C.
• the liquid vapor equilibrium measurements on the binary HFO-1234yf / HFO-1243zf are carried out for the following isotherm: 21.3 ° C.
• the system operates with 15 ° C overheating and 5 ° C subcooling.
• the minimum temperature difference between the secondary fluid and the refrigerant is considered to be of the order of 5 ° C.
• the isentropic efficiency of the compressors is a function of the compression ratio. This yield is calculated according to the following equation:
• the coefficient of performance is defined as the useful power provided by the system on the power supplied or consumed by the system.
• the Lorenz coefficient of performance (COPLorenz) is a benchmark coefficient of performance. It is temperature dependent and is used to compare the COPs of different fluids.
• the Lorenz COP in the case of heating is
• the performance coefficient of the Lorenz cycle is calculated according to the corresponding temperatures.
• the compression system In low temperature refrigeration mode, the compression system operates between an evaporator refrigerant inlet temperature of -30 ° C and a start temperature of condenser refrigerant condensation at 40 ° C. The system supplied cold at -25 ° C.
• the compression system In moderate heat mode, the compression system operates between a refrigerant inlet temperature at the evaporator of -5 ° C and a condensing temperature of the condenser refrigerant at 50 ° C.
• the system provides heat at 45 ° C.
• the compression system In moderate cooling mode, the compression system operates between an evaporator refrigerant inlet temperature of -5 ° C and a start temperature of condenser refrigerant condensation at 50 ° C. The system supplied cold at 0 ° C.
• evap outlet temperature designates the fluid temperature at the outlet of the evaporator
• comp outlet temperature designates the temperature of the fluid at the outlet of the compressor
• T output cond designates the fluid temperature at the outlet of the condenser
• evap P designates the pressure of the fluid in the evaporator
• cond P refers to the pressure of the fluid in the condenser
• Rate (w / w) refers to the compression ratio
• Glide designates the temperature slip
• comp efficiency means the compressor efficiency
• % CAP refers to the volumetric capacity of the fluid relative to the reference fluid indicated in the first line
• % COP / COPLorenz refers to the ratio of the COP of the system relative to the COP of the corresponding Lorenz cycle
• Liquid Psat refers to the liquid saturation pressure
• Psat vapor refers to the vapor saturation pressure
• % diff of pressure refers to the difference between these two pressures
• Example 2 Results for low temperature refrigeration, comparison with R404a and R407c Mixture HFC-32 / HFC-2a / HFO-1243zf
• Example 5 Results for heating at moderate temperature, comparison with HFC-134a
• Example 7 Results for heating at moderate temperature, comparison with R404a and R407c Mixture HFC-32 / HFO-1243zf / HFO-1234ze
• Example 1 Results for cooling at moderate temperature, comparison with HFC-32
• Example 12 Results for heating at moderate temperature, comparison with HFC-32 Mixture HFO-1234yf / HFC-32 / HFO-1243zf

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