Dimethyl Ether Refrigerant Mixtures for Low-GWP R134a Replacement
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Solution Overview
Problem
R134a, a commonly used refrigerant, has a high global warming potential (GWP) leading to regulatory limitations, necessitating the development of alternative refrigerant gas mixtures with lower production costs and improved environmental impact for applications in air conditioning and refrigeration.
Innovation Solution
A gaseous mixture comprising dimethyl ether and propylene or propane within specific concentration ranges (85-95% dimethyl ether and 5-15% propylene, or 71-85% dimethyl ether and 15-29% propane) is used as a replacement for R134a, offering improved thermodynamic characteristics and reduced GWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If R134a is used as refrigerant, then cooling performance is maintained, but global warming potential is high
Solution Approach 1:
The patent changes the chemical composition parameters by replacing fluorinated hydrocarbons (R134a with high GWP) with non-fluorinated hydrocarbon mixtures (dimethyl ether and propylene/propane) to achieve lower GWP while maintaining acceptable cooling performance through optimized concentration ratios
Solution Approach 2:
The patent uses composite refrigerant mixtures combining dimethyl ether with propylene or propane in specific ratios to create a new refrigerant composition that balances environmental performance (low GWP) with thermodynamic properties suitable for cooling applications
2Object-affected harmful factors
If alternative refrigerant mixtures are used, then environmental impact is improved, but production cost increases
Solution Approach 1:
The patent optimizes the concentration parameters of dimethyl ether and propylene/propane to find the most cost-effective mixture ratios that achieve the required environmental performance (GWP < 150) while minimizing production costs through balanced composition
3Object-affected harmful factors
If flammable refrigerant mixtures are used, then GWP is reduced, but system safety decreases
Solution Approach 1:
The patent carefully selects concentration parameters within specific ranges (85-95% dimethyl ether with 5-15% propylene, or 71-85% dimethyl ether with 15-29% propane) to achieve optimal balance between flammability reduction and GWP minimization, ensuring safety while maintaining environmental benefits
4Reliability
If refrigerant mixture composition is optimized, then thermodynamic properties are improved, but concentration range becomes limited
Solution Approach 1:
The patent identifies specific optimal concentration ranges for dimethyl ether and propylene/propane that deliver the best thermodynamic performance for refrigeration cycles, accepting the trade-off of limited concentration flexibility in exchange for optimized cooling efficiency and environmental performance
Data Source
AI summary
A method providing a replacement or alternative refrigerant, wherein the replacement of alternative refrigerant is a gaseous mixture, selected from: the gaseous mixture consisting of:dimethyl ether in a concentration from 85% to 95% by weight and propylene in a concentration from 5% to 15% by weight, and the gaseous mixture consisting of:dimethyl ether in a concentration from 71% to 85% by weight and propane in a concentration from 15% to 29% by weight as a replacement or alternative refrigerant for R134a and/or for other refrigerants which are replacements or alternatives to R134a containing HFC (hydrofluorocarbons), HFO (hydrofluoro olefins) and HFE (hydrofluoro ethers).