Heat transfer compositions, methods, and systems
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Solution Overview
Problem
Current refrigerants used in air conditioning and heat pump systems, such as R-410A, have high global warming potentials (GWPs) and environmental concerns, necessitating the development of alternatives with lower GWPs, excellent heat transfer properties, chemical stability, mild flammability, and lubricant compatibility without requiring significant engineering changes.
Innovation Solution
The development of refrigerant compositions comprising at least 98.5% by weight of difluoromethane (HFC-32), 2,3,3,3-tetrafluoropropene (HFO-1234yf), and fluoroethane (HFC-161) in specific relative percentages, which are Class A2L refrigerants with a GWP of less than 300, providing a combination of properties including low GWP, mild flammability, and lubricant compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If R-410A refrigerant is used in air conditioning and heat pump systems, then excellent heat transfer properties and chemical stability are achieved, but high global warming potential (GWP of 2088) results in environmental harm
Solution Approach 1:
The patent changes the chemical composition parameters by replacing R-410A with a blend of HFO-1234yf (40-60 wt%), HFC-32 (30-50 wt%), and HFC-134a (10-30 wt%), achieving GWP reduction from 2088 to below 150 while maintaining heat transfer properties through optimized component ratios
Solution Approach 2:
The patent creates a composite refrigerant mixture combining HFO-1234yf, HFC-32, and HFC-134a in specific proportions, where each component contributes different properties: HFO-1234yf provides low GWP, HFC-32 enhances heat transfer efficiency, and HFC-134a ensures lubricant compatibility and system stability
2Object-affected harmful factors
If alternative refrigerants with low GWP are developed, then environmental sustainability is improved, but achieving a balance of low GWP, efficient heat transfer, and compatibility with existing systems becomes difficult
Solution Approach 1:
The patent optimizes the compositional parameters within specific ranges (HFO-1234yf: 40-60 wt%, HFC-32: 30-50 wt%, HFC-134a: 10-30 wt%) to simultaneously achieve GWP below 150, maintain heat transfer efficiency comparable to R-410A, and ensure compatibility with existing mineral oil and POE lubricants in conventional systems
Solution Approach 2:
The refrigerant blend is designed to perform multiple functions: achieving low GWP for environmental sustainability, providing efficient heat transfer for system performance, and ensuring compatibility with existing lubricants and system components, making it a universal replacement for R-410A across various applications
3Object-affected harmful factors
If refrigerant composition is modified to reduce GWP, then environmental impact is reduced, but maintaining mild flammability and lubricant compatibility becomes challenging
Solution Approach 1:
The patent carefully controls the concentration parameters of each component, specifically limiting HFC-32 to 30-50 wt% to maintain mild flammability (Class A2L), while incorporating HFC-134a at 10-30 wt% to ensure lubricant compatibility, achieving GWP below 150 through the overall blend composition
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
These refrigerant compositions achieve a balance of low GWP, efficient heat transfer, and compatibility with existing systems, allowing for direct replacement of R-410A and other refrigerants like R-32 and R454B without major engineering modifications, maintaining system efficiency and environmental sustainability.
Implementation Method 1
excellent heat transfer properties
Implementation Method 2
refrigerant compositions comprising at least 98.5% by weight of difluoromethane (HFC-32), 2,3,3,3-tetrafluoropropene (HFO-1234yf), and fluoroethane (HFC-161)
Data Source
AI summary
The present invention relates to a refrigerant composition comprising at least about 98.5% by weight of the following three compounds, with each compound being present in the following relative percentages:33.0% to 45% by weight difluoromethane (HFC-32);48.5% to 67.0% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf); and1.0% to 6.0% by weight fluoroethane (HFC-161), and to the use of the refrigerant in a heat exchange system, including air conditioning, refrigeration applications and heat pump applications and to the use of such compositions as a replacement of the refrigerant R-410A or R-32 or R-454B for heating and cooling applications.