Low-Temperature Refrigerant Blend With Lower GWP and Oil Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current refrigerants like R404A and R507 have high Global Warming Potential (GWP) and are ozone-depleting, requiring replacement in refrigeration systems without significant changes to lubricants or hardware, while also needing to be non-flammable and energy-efficient.
Innovation Solution
A refrigerant composition comprising HFCs such as HFC 134a, HFC 125, HFC 32, HFC 227ea, and HFC 152a, with optional hydrocarbon components, which reduces GWP to below 2000 and ensures non-flammability under all conditions, allowing the use of hydrocarbon oils and compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HFC compositions R404A and R507 are used as replacements for ODS, then energy efficiency and non-flammability are improved, but Global Warming Potential increases to the high end of the range
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific blend of HFCs (R134a, R125, R32, R227ea, R152a) with controlled percentages to achieve a new refrigerant composition that maintains desirable thermodynamic properties while reducing GWP below 2000
Solution Approach 2:
The patent creates a composite refrigerant mixture combining multiple HFC components in specific ratios, where each component contributes different properties: R134a and R125 provide stability and low GWP, R32 enhances refrigerating effect, R227ea and R152a improve lubricant compatibility and oil return
2Object-generated harmful factors
If R404A and R507 are replaced with lower GWP alternatives, then environmental impact is reduced, but compatibility with existing lubricants and hardware becomes problematic
Solution Approach 1:
The patent adjusts the compositional parameters to include R227ea (2-12%) and R152a (2-10%) which have specific solubility characteristics that enable compatibility with both hydrocarbon and synthetic lubricants, allowing retrofitting of existing systems
Solution Approach 2:
The patent uses R227ea and R152a as intermediary components that mediate between the refrigerant and lubricant, improving solubility and preventing oil return problems that occur with traditional low-GWP alternatives
3Object-generated harmful factors
If hydrocarbon components are added to reduce GWP further, then environmental performance improves, but flammability risk increases
Solution Approach 1:
The patent precisely controls the percentage of flammable components (R32 at 25-45%, R152a at 2-10%) and combines them with non-flammable HFCs (R134a, R125, R227ea) in ratios that maintain the blend below flammability thresholds while achieving GWP reduction
Solution Approach 2:
The patent creates a composite mixture where flammable and non-flammable components are combined in specific proportions, leveraging the properties of each: R32 and R152a provide refrigerating effect and lubricant compatibility, while R134a, R125, and R227ea provide stability and fire suppression
Data Source
AI summary
Non ozone depleting and non flammable refrigerant compositions with GWPs less than 2,000 ITH which replace R404A, R507, HCFC22 and CFC502 in refrigeration systems.