HFO-1234ze and HFC-32 Refrigerant Blend for Low GWP
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Solution Overview
Problem
Current refrigerants like HFC-134a have high global warming potential and lack desirable properties such as low toxicity, low flammability, and chemical stability, while blends of fluorinated olefins like HFO-1234yf and HFO-1234ze fail to fully realize these properties, especially in air conditioning applications.
Innovation Solution
A heat transfer composition comprising HFO-1234ze in amounts of 86% to 95% by weight and HFC-32 in amounts of 5% to 14% by weight, with optional minor components, achieving exceptional heat transfer properties, low global warming potential, and non-hazardous combustion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC-134a is used as refrigerant, then excellent heat transfer properties and chemical stability are achieved, but high global warming potential (GWP of about 1430) occurs
Solution Approach 1:
The patent changes the chemical composition parameters by replacing HFC-134a with a blend of HFO-1234ze and HFO-1234yf fluorinated olefins. This parameter change achieves low GWP (less than 150) while maintaining acceptable heat transfer properties, though the patent acknowledges some trade-off in capacity and efficiency compared to HFC-134a
Solution Approach 2:
The patent uses a composite refrigerant blend combining two different fluorinated olefins (HFO-1234ze and HFO-1234yf) in specific proportions. This composite approach attempts to balance environmental benefits with heat transfer performance, leveraging the complementary properties of each component
2Object-affected harmful factors
If HFO-1234yf is used as refrigerant, then low global warming potential and excellent heat transfer properties are achieved, but increased flammability hazard occurs
Solution Approach 1:
The patent adjusts the compositional parameters by blending HFO-1234yf with HFO-1234ze in specific ratios. This parameter optimization attempts to reduce flammability while maintaining low GWP and acceptable heat transfer properties
Solution Approach 2:
The patent creates a composite refrigerant system combining HFO-1234yf with HFO-1234ze. The composite blend aims to mitigate the flammability hazard of HFO-1234yf while preserving its excellent heat transfer characteristics and low environmental impact
3Object-affected harmful factors
If HFO-1234ze is used as refrigerant, then low global warming potential and low flammability are achieved, but reduced heat transfer capacity occurs
Solution Approach 1:
The patent optimizes compositional parameters by blending HFO-1234ze with HFO-1234yf in specific proportions. This parameter adjustment attempts to enhance heat transfer capacity while maintaining low GWP and acceptable flammability characteristics
Solution Approach 2:
The patent develops a composite refrigerant blend of HFO-1234ze and HFO-1234yf to compensate for the lower heat transfer capacity of pure HFO-1234ze. The composite approach leverages the superior heat transfer properties of HFO-1234yf while benefiting from the low flammability and low GWP of HFO-1234ze
Data Source
AI summary
Heat transfer compositions, methods and use wherein the composition comprising: (a) from about 5 to about 20% by weight of HFC-32 and (b) from about 80% to about 95% by weight of HFO-1234ze.