Refrigerant Mixture Composition for Low-GWP R-404A Replacement
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Solution Overview
Problem
The refrigeration industry faces challenges in finding refrigerants with low global warming potential (GWP), non-flammability, and compatibility with existing systems, as current alternatives like HFC-404A and HFC-507A have high GWP and compressor discharge temperature issues, leading to equipment degradation.
Innovation Solution
A refrigerant composition comprising 11-28 weight percent difluoromethane, 34-59 weight percent pentafluoroethane, and 21-38 weight percent 2,3,3-tetrafluoropropene, which is non-flammable and has a global warming potential less than 2150, allowing for direct replacement of R-404A and R-507A with minimal system modifications, maintaining comparable cooling performance and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC-404A or HFC-507A are used as refrigerants, then cooling performance is maintained, but global warming potential becomes high
Solution Approach 1:
The patent changes the chemical composition parameters by using a mixture of HFC-32 (11-28 wt%), HFC-125 (34-59 wt%), and HFO-1234yf (21-38 wt%) to achieve low GWP while maintaining refrigeration performance. This compositional parameter change resolves the contradiction between environmental sustainability and cooling effectiveness.
2Object-affected harmful factors
If alternative refrigerants like R-407A or R-407F are used to reduce GWP, then global warming potential decreases, but compressor discharge temperature increases
Solution Approach 1:
The patent optimizes the compositional parameters by carefully selecting the ratios of HFC-32, HFC-125, and HFO-1234yf to achieve a balance that maintains acceptable compressor discharge temperatures while achieving low GWP. The specific composition ranges are designed to prevent excessive temperature rise in the compressor.
3Object-affected harmful factors
If refrigerant composition is changed to achieve low GWP, then environmental sustainability improves, but system compatibility and performance may deteriorate
Solution Approach 1:
The patent modifies the refrigerant composition parameters within specific ranges (HFC-32: 11-28 wt%, HFC-125: 34-59 wt%, HFO-1234yf: 21-38 wt%) to ensure compatibility with existing refrigeration systems while achieving low GWP. These parameter changes maintain performance characteristics such as pressure-temperature relationships and heat transfer properties.
Data Source
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AI summary
In accordance with the present invention refrigerant compositions are disclosed. The refrigerant compositions contain comprise 11-28 weight percent difluoromethane; 34-59 weight percent pentafluoroethane; and 21-38 weight percent 2,3,3,3-tetrafluoropropene. The refrigerant compositions are useful in processes to produce cooling, in methods for replacing refrigerant R-404A or R-507A, and in refrigeration systems. These inventive refrigerant compositions can be used in stationary and mobile refrigeration equipment, and are particularly useful for transport refrigeration units.