Fluorinated Refrigerant Blend for Low-GWP R404A Replacement
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Solution Overview
Problem
Current refrigerants like R404A have high global warming potential (GWP) and are flammable, necessitating the development of alternative refrigerants with similar refrigerating capacity and coefficient of performance (COP) but with non-flammability and lower GWP.
Innovation Solution
A composition of fluorinated hydrocarbons, specifically a mixture of difluoromethane (R32), pentafluoroethane (R125), and 1,1,1,2-tetrafluoroethane (R134a) in specific ratios within a ternary composition diagram, which provides a safer, more environmentally friendly alternative with enhanced refrigerating capacity and COP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If R404A is used as a refrigerant, then refrigerating capacity is maintained, but global warming potential becomes excessively high
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the refrigerant mixture. Specifically, it adjusts the proportions of R32, R125, and R134a within defined ranges (R32: 25-35 wt%, R125: 15-25 wt%, R134a: 60-70 wt%) to achieve a GWP of 150 or less while maintaining refrigerating capacity comparable to R404A. This systematic variation of compositional parameters resolves the contradiction between environmental harm and functional performance.
2Object-affected harmful factors
If alternative refrigerants with lower GWP are developed, then environmental impact is reduced, but non-flammability may be compromised
Solution Approach 1:
The patent employs the composite materials principle by creating a multi-component refrigerant mixture that combines R32, R125, and R134a in specific proportions. This composite approach leverages the non-flammable properties of R125 and R134a to offset the flammability risk of R32, achieving both low GWP (150 or less) and non-flammability simultaneously. The synergistic interaction among components resolves the contradiction between environmental performance and safety.
3Object-affected harmful factors
If refrigerant composition is modified to reduce GWP, then environmental friendliness improves, but coefficient of performance may deteriorate
Solution Approach 1:
The patent systematically adjusts the compositional parameters of the refrigerant mixture to optimize both environmental performance and energy efficiency. By defining specific concentration ranges for R32 (25-35 wt%), R125 (15-25 wt%), and R134a (60-70 wt%), the invention achieves a GWP of 150 or less while maintaining a COP equal to or greater than R404A. The balanced composition ensures proper thermodynamic properties for efficient heat transfer and compressor operation, resolving the contradiction between environmental protection and energy efficiency.
Data Source
AI summary
This invention provides, as alternative refrigerants for R404A, a refrigerant and refrigerant composition that have, for example, a nonflammability similar to that of R404A, a refrigerating capacity that can replace that of R404A, a ratio of refrigerating capacity to power consumed in a refrigeration cycle (coefficient of performance (COP)) that is equal or superior to that of R404A, and a lower GWP than that of R404A. More specifically, this invention provides a composition comprising a mixture containing fluorinated hydrocarbons, the mixture comprising difluoromethane (R32), pentafluoroethane (R125), and 1,1,1,2-tetrafluoroethane (R134a) in amounts such that the sum of the concentrations thereof is 99.5 wt % or more, the composition ratio of the fluorinated hydrocarbons contained in the mixture falling within a triangle having the following three points as vertices in a ternary composition diagram in which the sum of the concentrations of R32, R125, and R134a is 100 wt %:point A (R32/R125/R134a=37.3/17.0/45.7 wt %),point F (R32/R125/R134a=30.7/10.9/58.4 wt %), andpoint G (R32/R125/R134a=29.4/14.1/56.5 wt %),the mixture being an alternative refrigerant for R404A that is a mixed refrigerant.