Heat transfer methods, systems and compositions
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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, and low toxicity, while maintaining compatibility with existing system conditions without requiring significant redesign, and having a low Global Warming Potential (GWP).
Innovation Solution
A refrigerant composition comprising difluoromethane (HFC-32), pentafluoroethane (HFC-125), trifluoroiodomethane (CF3I), and trans 1,3,3,3-tetrafluoropropene (HFO-1234ze) in specific weight percentages, which is substantially free or contains minimal amounts of carbon dioxide, ensuring non-flammability and efficient performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
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 using HFC-32 (difluoromethane) as the primary component instead of the R-410A mixture of HFC-32 and HFC-125. This parameter change maintains the heat transfer efficiency needed for productive cooling while reducing the Global Warming Potential from 2088 to a lower value, thus resolving the contradiction between productivity and environmental harm.
2Reliability
If a replacement refrigerant is developed with excellent heat transfer properties, chemical stability, non-flammability, and low toxicity, then performance requirements are met, but the complexity of achieving all properties simultaneously increases
Solution Approach 1:
The patent employs a composite refrigerant formulation consisting of HFC-32 as the main component (70-90 weight %) combined with specific additives including HFO-1234ze (5-20 weight %), CF3I (0.1-5 weight %), and CO2 (0-10 weight %). This composite approach allows the refrigerant to simultaneously achieve excellent heat transfer properties, chemical stability, non-flammability, and low toxicity by leveraging the complementary characteristics of each component, thus meeting multiple performance requirements without excessive complexity.
3Object-generated harmful factors
If R-410A is replaced with an alternative refrigerant, then environmental impact is reduced, but compatibility with existing system conditions may be compromised
Solution Approach 1:
The patent maintains compatibility with existing R-410A systems by carefully controlling the operating pressure and temperature parameters within ranges similar to R-410A, and by selecting HFC-32 as the base component which shares chemical compatibility characteristics with the original R-410A formulation. This allows the replacement refrigerant to reduce environmental impact while adapting to existing system conditions without requiring significant redesign.
4Reliability
If flammability is reduced to non-flammable levels, then safety is improved, but the range of available refrigerant compounds is limited
Solution Approach 1:
The patent achieves non-flammability (safety) by formulating a composite refrigerant where HFC-32 (non-flammable) serves as the primary component and is combined with HFO-1234ze, CF3I, and CO2 in specific proportions. This composite formulation maintains non-flammable characteristics while expanding the range of available compounds through the synergistic combination of multiple substances, each contributing different properties to the overall mixture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed refrigerant composition provides exceptional heat transfer properties, chemical stability, and low toxicity, matching or exceeding the efficiency of R-410A while being non-flammable and having a reduced GWP, allowing for seamless integration into existing systems without redesign and minimizing environmental impact.
Implementation Method 1
Mechanical refrigeration systems, and related heat transfer devices, such as heat pumps and air conditioners, using refrigerant liquids are well known in the art
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 40% by weight to about 49% 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 40% by weight trifluoroiodomethane (CF3I); andfrom about 2% by weight to about 12% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentages are based on the total weight of the three compounds in the blend, and systems and method using same.