Composition containing refrigerant and application of said composition
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Solution Overview
Problem
Current refrigerants like R404A have high global warming potential (GWP) and are being phased out, while R22 is also being abolished due to environmental regulations, necessitating a refrigerant with similar performance but lower GWP and non-flammability for refrigeration systems.
Innovation Solution
A composition of difluoromethane (R32), pentafluoroethane (R125), and 1,1,1,2-tetrafluoroethane (R134a) at specific concentrations, forming a mixture that replaces R404A or R22, offering equal refrigerating capacity, improved coefficient of performance (COP), and meeting ASHRAE non-flammability standards with a GWP of 1500 or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If R404A is used as a refrigerant, then refrigerating capacity and COP are maintained at high levels, but global warming potential becomes extremely high (GWP=3922)
Solution Approach 1:
The invention changes the chemical composition parameters by replacing R404A with a specific mixture of R32, R125, and R134a in optimized proportions (15-30 wt% R32, 5-20 wt% R125, 60-75 wt% R134a). This parameter optimization achieves GWP of 1500 or less while maintaining refrigerating capacity equal to R404A and COP equal to or superior to R404A
Solution Approach 2:
The invention uses a composite refrigerant mixture combining three different fluorinated hydrocarbons (R32, R125, R134a) in specific proportions. This composite approach leverages the complementary properties of each component: R32 provides high refrigerating capacity, R125 provides stability and low flammability, and R134a provides low GWP, achieving a balance that none of the individual components can achieve alone
2Object-affected harmful factors
If alternative refrigerant mixtures are developed to reduce GWP, then environmental performance improves, but compressor outlet temperature becomes too high (above 130°C)
Solution Approach 1:
The invention optimizes the composition parameters within specific ranges (15-30 wt% R32, 5-20 wt% R125, 60-75 wt% R134a) to control the thermodynamic properties of the refrigerant mixture. This parameter optimization ensures that the compressor outlet temperature remains at 130°C or lower while achieving GWP of 1500 or less, resolving the trade-off between environmental performance and operational temperature
3Object-affected harmful factors
If refrigerant composition is modified to achieve low GWP, then environmental impact is reduced, but flammability performance deteriorates (ASHRAE non-flammability not achieved)
Solution Approach 1:
The invention carefully controls the concentration parameters of R32 (15-30 wt%), R125 (5-20 wt%), and R134a (60-75 wt%) to simultaneously achieve low GWP and ASHRAE non-flammability (class 1 refrigerant). The specific proportion ranges are optimized to maintain the mixture within safe flammability limits while minimizing environmental impact
Data Source
AI summary
This invention provides a composition comprising a refrigerant, the composition being non-flammable like R404A (R125/R134a/R143a=44/4/52 wt %), and having a refrigerating capacity that can replace that of R404A, a COP that is equal or superior to that of R404A, and a GWP of 1500 or less. Specifically, the invention provides a composition comprising a refrigerant, the refrigerant comprising a mixture of fluorinated hydrocarbons, the mixture comprising difluoromethane (R32), pentafluoroethane (R125), and 1,1,1,2-tetrafluoroethane (R134a) at specific concentrations, the fluorinated hydrocarbons contained in the mixture having a specific composition ratio. This composition is for use as an alternative refrigerant for R22 or an alternative refrigerant for R404A.