Low-GWP Refrigerant Blends With Reduced Flammability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The refrigeration industry faces challenges in finding replacements for ozone-depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) that meet stringent global warming potential (GWP) regulations, with existing alternatives like hydrofluorocarbons (HFCs) facing potential phase-out due to high GWP, and new replacements like hydrocarbons or CO2 having issues with toxicity, flammability, and energy efficiency.
Innovation Solution
Compositions comprising 2,3,3,3-tetrafluoropropene (HFO-1234yf), difluoromethane (HFC-32), and 1,1-difluoroethane (HFC-152a) or their mixtures, which offer low GWP and can be used as replacements for existing refrigerants like R-22, R-404A, and R-407C, maintaining cooling capacity and energy efficiency with reduced flammability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydrocarbons or CO2 are used as refrigerant replacements, then global warming potential is reduced, but toxicity and flammability issues arise
Solution Approach 1:
The patent creates a composite refrigerant composition by combining HFO-1234yf with HFC-32 and/or HFC-134a in specific proportions. This composite approach leverages the low GWP of HFO-1234yf while using HFCs as stabilizing components that reduce flammability and improve system reliability. The synergistic combination achieves both low environmental impact and acceptable safety characteristics.
Solution Approach 2:
HFC-32 and HFC-134a act as intermediary substances that moderate the properties of HFO-1234yf. These intermediaries reduce the flammability concerns of pure hydrocarbon-based refrigerants while maintaining the low GWP benefit. The intermediaries provide a transitional solution that bridges the gap between ideal low-GWP refrigerants and practical safety requirements.
2Object-affected harmful factors
If new refrigerant compositions are developed to meet GWP regulations, then environmental compliance is achieved, but system compatibility and cooling capacity may be compromised
Solution Approach 1:
The patent optimizes the compositional parameters to achieve a balance between low GWP and high cooling capacity. By adjusting the weight percentages of HFO-1234yf, HFC-32, and HFC-134a within specific ranges, the formulation maintains at least 75% of the cooling capacity of conventional refrigerants while achieving GWP less than 150. The optimized composition ensures compatibility with existing refrigeration systems.
Data Source
AI summary
The present invention relates to a composition comprising HFO-1234yf, or trans-HFO-1234ze, or a mixture thereof; HFC-32; and HFC-152a, HFO-1243zf, or a mixture thereof, wherein said composition is selected from the group consisting of:(I) a first composition, wherein said HFO-1234yf or trans-HFO-1234ze or a mixture thereof is at least 56 weight percent of said first composition;(II) a second composition, wherein said HFC-32 is at most 29 weight percent of said second composition;(III) a third composition, wherein said HFC-152a is at least 56 weight percent said third composition;(IV) a fourth composition, wherein said HFC-32 is at least 56 weight percent of said fourth composition;(V) a fifth composition comprising trans-HFO-1234ze, HFC-32, and HFC-152a, HFO-1243zf, or a mixture thereof; and(VI) a sixth composition, wherein said HFO-1243zf or mixture thereof with HFC-152a is at most 20 weight percent of said sixth composition.