Heat transfer compositions, methods and systems
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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 without requiring significant modifications to existing systems, and must function effectively across a range of temperatures.
Innovation Solution
A refrigerant composition comprising at least 99.5% by weight of a blend of difluoromethane (HFC-32), pentafluoroethane (HFC-125), trifluoroiodomethane (CF3I), and 2,3,3,3-tetrafluoropropene (HFO-1234yf) in specific ratios, ensuring non-flammability and matching the efficiency and capacity of R-410A while having a lower Global Warming Potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If R-410A is used as a refrigerant replacement for R-22, then ozone depletion potential is reduced, but global warming potential increases significantly
Solution Approach 1:
The patent uses a composite refrigerant formulation consisting of multiple HFO compounds (1234ze(E), 1234yf, 1225ye(E)) combined in specific ratios. This composite approach allows the refrigerant to achieve both low GWP (less than 150) and acceptable heat transfer properties, resolving the contradiction between environmental performance and functional effectiveness.
Solution Approach 2:
The patent changes the chemical composition parameters by transitioning from HFC-based refrigerants (R-410A) to HFO-based refrigerants. This parameter change fundamentally alters the environmental profile, reducing both ozone depletion potential and global warming potential while maintaining refrigerant functionality through careful selection of molecular structures and ratios.
2Reliability
If a refrigerant composition is designed to meet multiple conflicting properties (heat transfer efficiency, chemical stability, non-flammability, lubricant compatibility), then system performance improves, but development complexity increases
Solution Approach 1:
The patent applies local quality by optimizing specific regions of the composition space - selecting particular HFO compounds and ratios that locally satisfy multiple requirements. The specific formulation (HFO-1234ze(E) 5-20%, HFO-1234yf 5-20%, HFO-1225ye(E) 55-85%) creates localized optimal properties for heat transfer, stability, and compatibility without requiring system redesign.
Solution Approach 2:
The patent copies the functional performance characteristics of R-410A (high efficiency, non-flammability) while using fundamentally different chemical constituents (HFOs instead of HFCs). This allows the new refrigerant to replicate the desired performance profile without inheriting the high GWP problem, simplifying the path to market acceptance.
3Object-generated harmful factors
If R-410A is replaced with a new refrigerant composition, then environmental impact is reduced, but heat transfer performance may be compromised
Solution Approach 1:
The patent employs a composite refrigerant system combining multiple HFO compounds, each contributing different properties. HFO-1234ze(E) and HFO-1234yf provide desirable heat transfer characteristics and volatility, while HFO-1225ye(E) contributes to thermodynamic efficiency and low GWP. The synergistic combination maintains heat transfer performance comparable to R-410A while achieving GWP less than 150.
Solution Approach 2:
The patent changes key thermodynamic parameters of the refrigerant system by using HFO compounds with different molecular weights and saturation pressures compared to HFCs. These parameter changes are optimized to maintain appropriate evaporating and condensing temperatures, ensuring heat transfer efficiency is preserved despite the chemical substitution.
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) and from 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.