Heat Transfer Enhancement with Advanced Refrigerants

Fluoropropene-based refrigerant compositions that meet evolving regulatory requirements for refrigerants with low ozone depletion potential (ODP) and low global warming potential (GWP). The compositions contain Z-1,3,3,3-tetrafluoropropene as the fluorinated component, with HFC-1234ze(Z) and HFC-1336mzz(E) as additional components. The Z-isomer is produced through selective isomerization of the starting material in the gas phase or liquid phase, followed by recovery and conversion to the Z-isomer.

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Refrigerant compositions for replacing R-410A and R-32 in air conditioning and refrigeration systems with lower global warming potentials. The compositions are miscible with common lubricants, have good heat transfer, stability, and flammability, and can be used in existing systems without major changes. The refrigerant blends contain HFC-32, HFO-1234yf, and a trace of HFC-161. The compositions have GWPs below 300 and can be used as alternatives to R-410A and R-32 in stationary air conditioning, refrigeration, and heat pump systems.

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Refrigerant compositions for hermetic compressors in vapor compression systems that achieve low discharge temperatures and high heat capacities while meeting regulatory requirements for low global warming potential (GWP) refrigerants. The compositions contain a combination of difluoromethane (R-32), 2,3,3,3-tetrafluoropropene (R-1234yf), and isobutane (R-600a) in a specific weight ratio. The refrigerant composition exhibits lower discharge temperatures compared to conventional refrigerants like R-404A, while maintaining high heat capacity. This composition is suitable for hermetic compressors used in refrigeration applications.

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Refrigerant composition for hermetic compressors in vapor compression systems that maintains low global warming potential (GWP) while providing comparable refrigeration performance. The composition comprises difluoromethane (R-32), 2,3,3,3-tetrafluoropropene (R-1234yf), and propane (R-290) in a blend ratio optimized for hermetic compressor operation. The composition achieves a balance of low GWP and high refrigerant properties, particularly in applications requiring medium to low evaporator temperatures.

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Heat transfer compositions that provide similar or better refrigeration performance, capacity, and safety compared to existing refrigerants like R-22 and R-404A, while achieving lower global warming potential. The compositions exhibit reduced flammability and maintain reduced flammability upon fractionation between liquid and vapor phases, with minimal changes in composition or pressure following leakage. They also maintain high efficiency and COP compared to R-22 and R-404A.

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A refrigerant composition for refrigeration systems that achieves low global warming potential (GWP) while maintaining excellent performance characteristics. The composition comprises at least 98.5% by weight of difluoromethane (HFC-32), 69.5% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf), and 9.0% by weight of fluoroethane (HFC-161), with the remaining percentage comprising other HFCs. This composition provides a GWP of 150 or less while maintaining high heat transfer coefficients and chemical stability. The composition is suitable for use in residential air conditioning, variable refrigerant flow air conditioning, residential heat pumps, commercial air conditioning chillers, residential air-to-water heat pump hydronic systems, medium temperature refrigeration, low temperature refrigeration, mobile air conditioning, and mobile heat pumps.

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A refrigerant composition that combines the high performance of R410A with the low GWP of HFC-32, achieving both excellent performance and environmental benefits. The composition comprises a refrigerant comprising HFO-1132, HFO-1123, and HFC-32.

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Refrigerant blend with improved properties for air conditioning and heat pump systems compared to R-410A. The blend contains specific proportions of HFC-32, HFC-125, CF3I, and HFO-1234yf. It has better heat transfer, miscibility, and lubricant compatibility compared to R-410A. The blend ratio is about 46-48% HFC-32, 11-12% HFC-125, 34-36% CF3I, and 5-7% HFO-1234yf.

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An environmentally friendly refrigerant blend for air conditioning systems with lower global warming potential (GWP) compared to commonly used refrigerants like R134a. The blend contains fluoroethane (R161), trifluoromethyl methyl ether (RE143a), and dimethyl ether (RE170) in a specific proportion. The blend provides similar cooling capacity and efficiency to R134a while reducing GWP. The refrigerant blend can be used in existing air conditioning systems as a drop-in replacement.

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A refrigerant composition that enables environmentally friendly air conditioning systems while maintaining performance characteristics comparable to existing refrigerants. The composition comprises a mixture of difluoromethane (HFC-32), fluoromethane (HFC-41), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), with a composition ratio optimized for refrigerant charge reduction and global warming potential (GWP) performance. The optimized ratio achieves a GWP of 300 or less, reduced refrigerant charge (8-10%), and improved volumetric capacity compared to conventional HFC-410A.

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A refrigerant composition for refrigeration applications with reduced global warming potential (GWP) compared to common refrigerants like R404A and R134a. The composition contains two hydrofluoroolefin (HFO) compounds, trans-1,2-difluoroethylene (HFO-1132) and 2,3,3,3-tetrafluoropropene (HFO-1234yf), in specific ratios. The compositions have equivalent or better cooling capacity and coefficient of performance compared to R404A and R134a while having lower GWP. This makes them suitable replacements for applications like vehicle air conditioning and refrigeration equipment. The composition ratios are: (1) HFO-1132:HFO-1234yf, 40.5-4

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Novel refrigerant compositions and heat transfer fluids with unique properties that can replace current refrigerants like HFC-134a. The compositions contain at least one fluoroolefin, such as 1-fluoro-2-butene or 1-fluoro-2-pentene. These fluoroolefins have low global warming potential and ozone depletion potential, and can be used in refrigeration, air conditioning, and heat pump systems.

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A refrigerant for air conditioning and refrigeration systems that replaces R-410A while maintaining excellent heat transfer properties. The refrigerant composition comprises at least 97% of a blend of four compounds, with specific percentages based on the total weight of the three compounds. This composition achieves the desired properties while avoiding the immiscibility issues with polyol ester (POE) lubricants commonly used in these applications. The composition is specifically designed to meet the unique requirements of both refrigeration and air conditioning systems, making it suitable for both low- and high-temperature applications.

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Composition de transfert de chaleur à base de difluorométhane, de pentafluoroéthane, de tétrafluoropropène et de propane, utilisée dans les systèmes de transfert de chaleur à basse pression, qui présente des performances élevées et un faible impact environnemental.

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A refrigerant and lubricant combination for refrigeration systems that enables efficient operation in both cooling and heating modes. The composition comprises a refrigerant containing 2,3,3,3-tetrafluoropropene and 1,1,1,2-tetrafluoroethane, combined with a lubricant that is miscible with the refrigerant over its entire operating temperature range. This pairing enables reliable operation in a wide range of refrigeration applications, including domestic refrigeration, commercial refrigeration, and industrial refrigeration systems.

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A refrigerant and lubricant blend for heat transfer applications, particularly in air conditioning systems, that offers superior performance and environmental benefits over conventional R-410A. The blend comprises a refrigerant with a specific molecular structure, a lubricant comprising polyol ester (POE) or polyvinyl ether (PVE), and a stabilizer that enhances the refrigerant's chemical stability and non-flammability. The stabilizer composition, comprising a blend of alkylated naphthalene and an acid depleting moiety, provides critical properties such as excellent heat transfer performance, chemical stability, and low toxicity, making it suitable for both new system design and retrofitting applications.

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Refrigerant compositions comprising difluoromethane and at least one multi-fluorinated olefin and/or fluoroiodocarbon, which exhibit zeotropic properties and are suitable for use in heat transfer systems such as refrigeration systems and air conditioning systems, particularly for applications requiring low global warming potential and high performance.

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A heat transfer method using a composition containing hydrofluoroolefin in heat pumps, particularly for high-temperature applications. The composition, comprising a hydrofluoroolefin with four carbon atoms, exhibits negligible ozone depletion equivalent (ODEP) and a greenhouse gas equivalent (GWP) of less than 1300. This hydrofluoroolefin-based refrigerant exhibits superior performance characteristics compared to traditional HFC-134a, particularly at high condensation temperatures. The composition enables efficient heat transfer in compression systems, particularly in multi-stage compression systems, while maintaining low environmental impact.

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A refrigerant composition for refrigeration systems that achieves high compatibility and thermal stability through a specific blend of hydrofluoroethane, difluoromethane, and tetrafluoropropene. The composition, comprising a refrigerant containing these components and a compatible base oil, demonstrates superior compatibility and performance characteristics compared to conventional refrigerants. The refrigerant composition enables efficient operation in refrigeration systems, particularly in applications requiring high cooling efficiency, such as compressors and evaporators.

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Refrigerant composition for automotive air conditioning systems that combines superior performance with environmentally friendly characteristics. The composition comprises 2,3,3,3-tetrafluoropropene and trans-1,3,3,3-tetrafluoropropene in a weight ratio of 60-80 parts to 15-30 parts fluoroethane. The refrigerant exhibits low GWP (4) and ODP (0), while maintaining excellent performance characteristics including low exhaust temperature and high saturated liquid specific volume. The composition is prepared through physical mixing in a liquid phase, enabling direct charging and application in existing systems.

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Refrigerant gas composition for inverter air conditioners and heat pumps that provides improved performance and efficiency compared to conventional R410A blends. The composition consists of a blend of 1,1,1,2-tetrafluoroethane (R134A), difluoromethane (R32), and pentafluoroethane (R125), with a specific weight ratio of 94-96% R134A, 2-3% R32, and 2-3% R125.

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Chloro-trifluoropropenes as refrigerants in negative pressure liquid coolers, particularly for replacement of R-11 and R-123. The refrigerants exhibit high efficiency and unexpectedly high capacity in liquid cooler applications, making them suitable for environmentally sustainable refrigeration systems. The refrigerants, particularly 1-chloro-3,3,3-trifluoropropene, have unique properties that enable them to replace traditional refrigerants like R-123 and R-11 in negative pressure chillers.

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A refrigerant composition comprising a multi-fluorinated olefin and HFC-32, with the composition achieving superior performance characteristics compared to existing refrigerants. The composition comprises at least one C3-C4 tetra- or pentafluorinated olefin, more preferably tetrafluoropropene, and at least one compound having an unsaturated terminal carbon having no more than one fluorine substituent, in certain embodiments consisting essentially of said at least one compound.

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Azeotropic mixture for heat transfer fluids in two-phase heat exchangers that combines the benefits of azeotropic mixtures with improved performance characteristics. The mixture comprises a fluorinated compound with a boiling point greater than 23°C and low relative volatility, and a non-fluorinated compound with a carbonyl or alcohol function. The mixture achieves a negative azeotropic deviation, where the composition of the vapor phase remains constant over a wide range of liquid compositions, while maintaining low relative volatility. This unique composition enables efficient operation in two-phase heat exchangers, particularly in applications requiring low-temperature boiling points and high-boiling-point components.

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A refrigerant composition comprising tetrafluoropropene and difluoromethane that achieves ozone depletion potential (ODP) and global warming potential (GWP) limits. The composition, which can be used as a refrigerant in air conditioning and heating systems, has a GWP of less than 1000, less than 600, less than 500, less than 400, less than 300, less than 150, less than 100, or less. This composition enables the replacement of high-GWP refrigerants like R-410A while maintaining low ODP and GWP.

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Heat transfer compositions for refrigeration and air-conditioning systems that offer improved performance and environmental sustainability compared to existing refrigerants. The compositions comprise a blend of fluorinated hydrocarbons (R-32, R-125, R-1234ze, and R-134) in specific weight ratios, with the R-32 component making up 2-97% of the total composition. These compositions exhibit non-flammability, minimal vapor pressure changes upon leakage, and maintain their refrigerant properties during fractionation. They can be used in both existing and new systems, including retrofitting existing equipment with R-22 or R-407C systems.

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Heat transfer composition with low glide, specifically <10 °C, for refrigeration, air conditioning, and heat pump systems. The composition comprises 2,3,3,3-tetrafluoropropene, difluoromethane, pentafluoroethane, and 1,1,1,2-tetrafluoroethane in a specific ratio, with a total weight percentage of 1% to 97% of R-32, from about 1% to 97% of R-125, from about 1% to 97% of R-1234yf, and from about 1% to 97% of R134a. The composition exhibits minimal change in composition or vapor pressure after leakage from a vessel, with non-flammable properties.

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A refrigerant and lubricant combination for refrigeration systems that combines high-performance HFC-1234yf with compatible PEO-based lubricants. The refrigerant contains 2,3,3,3-tetrafluoropropene (HFO-1234yf) and trans-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze), while the lubricant is a PEO-based solution. This composition enables efficient refrigeration performance with minimal environmental impact, particularly in applications requiring high cooling capacities like commercial refrigeration and industrial air conditioning.

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A refrigerant system for air conditioning and refrigeration applications that utilizes a novel heat transfer process involving multiple stages of compression and expansion. The system comprises a refrigerant fluid comprising a combination of 60-95% propane and 5-40% amyl-based burners, with at least one control in the heat accumulated during use. The system achieves efficient heat transfer through a multi-stage compression-expansion process, where the refrigerant fluid undergoes evaporation, compression, and expansion stages, with the fluid temperature reaching above 35°C in the condensing stage.

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Refrigerants for air conditioning and refrigeration systems that achieve high energy efficiency while maintaining low global warming potential (GWP) and ozone depletion potential (ODP). The refrigerants in question are compositions of 2,3,3,3-tetrafluoropropene and 1,1,1,2-tetrafluoroethane, with specific weight percentages ranging from 6 to 70% 2,3,3,3-tetrafluoropropene and 30 to 94% 1,1,1,2-tetrafluoroethane. These compositions exhibit azeotropic behavior, meaning their boiling points are fixed at a constant value, and demonstrate superior performance in terms of volumetric cooling capacity compared to traditional refrigerants like HFC-134a and CFC-12. The compositions can be used in both flooded and direct expansion chillers, with the latter offering improved condenser performance.

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A ternary fluorocarbon-based heat transfer fluid with significantly reduced global warming potential (GWP) compared to conventional HFC-134a, while maintaining comparable performance characteristics. The fluid, comprising a 52% HFO-1234ze, 25% HFC-125, and 23% HFO-1234yf mixture, demonstrates a GWP of approximately 0.1 relative to carbon dioxide over a 100-year time horizon, making it a suitable replacement for traditional refrigerants. The fluid exhibits superior energy efficiency and environmental performance in vapor compression systems, particularly in low-temperature refrigeration and moderate-temperature heating applications.

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