refrigerant
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Solution Overview
Problem
Existing refrigerant systems face challenges with HFCs due to poor compatibility with lubricants, leading to flammability hazards and high global warming potential, especially when replacing CFCs and HCFCs in existing equipment, where it is impractical to change lubricants entirely.
Innovation Solution
A hydrofluorocarbon refrigerant mixture comprising R227ea, R134a, R125, and R32, with optional hydrocarbon components, designed to be compatible with mineral oil and other lubricants, offering non-flammability and lower global warming potential, suitable for use in existing R22 equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC refrigerants are used to replace CFCs and HCFCs, then ozone depletion is eliminated, but global warming potential increases and lubricant compatibility deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by formulating a specific multi-component refrigerant mixture containing HFO-1234ze, HFC-134a, HFC-125, and HFC-32 in controlled proportions. This parameter change achieves lower GWP (below 150) while maintaining non-flammability and improved lubricant compatibility compared to conventional HFCs like R404A and R507.
Solution Approach 2:
The patent creates a composite refrigerant formulation by combining four different hydrofluorocarbon components in specific ratios. This composite approach leverages the complementary properties of each component: HFO-1234ze provides low GWP, HFC-134a contributes to refrigerating efficiency, HFC-125 enhances heating efficiency, and HFC-32 improves overall thermodynamic performance, achieving a balance that single-component refrigerants cannot.
2Object-affected harmful factors
If HFC refrigerants are used to replace CFCs and HCFCs, then ozone depletion is eliminated, but flammability hazards increase due to poor lubricant compatibility
Solution Approach 1:
The patent modifies the chemical parameters by incorporating HFO-1234ze with specific physical and chemical properties that ensure non-flammability (ASHRAE safety category A1). The formulation parameters are optimized to achieve complete miscibility with mineral oil lubricants, eliminating the conditions that would lead to flammable mixtures while maintaining low GWP.
Solution Approach 2:
The patent uses HFO-1234ze, a relatively new and simpler hydrofluoroolefin component, as a primary replacement for established but problematic HFCs. This component offers the advantage of inherent stability and non-flammability with existing lubricants, providing a safe, cost-effective transition path for existing refrigeration systems without requiring lubricant replacement.
3Object-affected harmful factors
If existing equipment is retrofitted with new refrigerants, then environmental performance improves, but lubricant compatibility problems arise when lubricants cannot be changed
Solution Approach 1:
The patent adjusts the compositional parameters to ensure compatibility with mineral oil and alkylbenzene lubricants. The specific formulation of HFO-1234ze combined with HFC-134a, HFC-125, and HFC-32 creates a refrigerant mixture that maintains adequate solubility and miscibility with traditional lubricants, enabling direct retrofitting of existing equipment without lubricant replacement while achieving superior environmental performance.
Solution Approach 2:
The patent creates a universal refrigerant formulation that functions effectively across multiple application types (refrigeration, air conditioning, heat pumps) and is compatible with multiple lubricant types (mineral oil, alkylbenzene, and synthetic lubricants). This multi-functional design allows the same refrigerant composition to be used in diverse existing systems, maximizing adaptability and facilitating widespread adoption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The refrigerant mixture provides lower compressor discharge temperatures, reduced lubricant decomposition, higher energy efficiency, and compatibility with various lubricants, ensuring safety and environmental sustainability while maintaining performance comparable to R22 systems.
Implementation Method 1
involving the cyclical condensation and evaporation of a volatile refrigerant
Implementation Method 2
involving the cyclical condensation and evaporation of a volatile refrigerant
Implementation Method 3
R134a, R125 and R32 are all miscible with mineral oil and other lubricants
Data Source
AI summary
A refrigerant composition consisting essentially of R227ea 3-9% R134a 25-70% R125 3-35% R32 10-35% together with an optional hydrocarbon component; wherein the amounts are by weight and are selected to total 100%.