Refrigerant Blend Composition for Low-GWP R-410A Replacement
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Solution Overview
Problem
There is a need for a refrigerant that can replace R-410A in heat exchange systems, offering excellent heat transfer properties, chemical stability, non-flammability, lubricant miscibility, and low Global Warming Potential (GWP) without requiring significant modifications to existing systems, as R-410A has a high GWP and is not a drop-in replacement for R-22.
Innovation Solution
A refrigerant composition comprising between 38% and 48% difluoromethane (HFC-32), 6% to 12% pentafluoroethane (HFC-125), 33% to 41% trifluoroiodomethane (CF3I), and 2% to 16% 2,3,3,3-tetrafluoropropene (HFO-1234yf), with specific weight ratios to achieve non-flammability and reduced GWP, ensuring compatibility with R-410A systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If R-410A is used as a refrigerant, then heat transfer efficiency is improved, but Global Warming Potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the refrigerant by blending HFC-32, HFC-125, and HFO-1234yf in specific proportions (38-48%, 6-12%, and 2-16% respectively) to achieve a GWP of less than 750 while maintaining heat transfer efficiency comparable to R-410A
Solution Approach 2:
The patent creates a composite refrigerant composition by combining multiple refrigerant components (HFC-32, HFC-125, HFO-1234yf) with specific weight ratios to achieve desired thermodynamic properties and environmental performance that individual components cannot provide alone
2Object-generated harmful factors
If a replacement refrigerant is developed, then environmental acceptability is improved, but system compatibility and heat transfer properties become difficult to achieve
Solution Approach 1:
The patent optimizes multiple composition parameters simultaneously (proportions of HFC-32, HFC-125, HFO-1234yf) to achieve a balance between environmental performance (GWP < 750) and system compatibility (non-flammability, lubricant miscibility, heat transfer properties)
Solution Approach 2:
The patent develops a refrigerant composition that serves multiple functions: it provides acceptable environmental performance, maintains non-flammability, ensures lubricant compatibility, and delivers adequate heat transfer properties, making it a versatile replacement for R-410A in existing systems
3Object-affected harmful factors
If non-flammable compounds are used, then safety is improved, but heat transfer properties and lubricant compatibility become harder to achieve
Solution Approach 1:
The patent adjusts the composition parameters by selecting specific ratios of non-flammable HFC and HFO components that maintain non-flammability (meeting ASHRAE Standard 34) while preserving adequate heat transfer properties through the synergistic effect of the blended components
Data Source
AI summary
Disclosed are refrigerants comprising at least about 97% by weight of a blend of three compounds, said blend consisting of:from about 38% by weight to about 48% by weight difluoromethane (HFC-32),from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125),from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) andfrom about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf)wherein the percentages are based on the total weight of the three compounds in the blend, and methods and systems which use same.