Low-GWP Refrigerant Composition for Cold Storage
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Solution Overview
Problem
There is a lack of studies on which refrigerant with low Global Warming Potential (GWP) should be used for refrigerant cycle apparatuses for freezing or cold storage, despite the need for alternatives to high-GWP refrigerants like R410A and R404A due to global warming concerns.
Innovation Solution
A refrigerant cycle apparatus using a refrigerant composition that includes CO2, trans-1,2-difluoroethylene (HFO-1132(E)), and 2,3,3-tetrafluoro-1-propene (R1234yf), with specific mass percentage ranges defined by curves and points in a ternary composition diagram to optimize refrigerating capacity, GWP, and flammability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-GWP refrigerants like R410A or R404A are used, then refrigerating capacity is maintained at high levels, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the refrigerant by using a specific mixture of HFO-1132(E), R32, and R1234yf with controlled mass percentages, achieving both low GWP and high refrigerating capacity through optimized compositional parameters
Solution Approach 2:
The patent creates a composite refrigerant mixture combining multiple components (HFO-1132(E), R32, R1234yf) in specific proportions to achieve properties that individual components cannot provide alone, balancing environmental compatibility with refrigerating performance
2Object-affected harmful factors
If low-GWP refrigerants are used, then global warming potential is reduced, but refrigerating capacity decreases
Solution Approach 1:
The patent optimizes the mass percentage parameters of each refrigerant component to achieve the desired balance between low GWP and high refrigerating capacity through precise compositional control
Solution Approach 2:
The patent assigns specific functional roles to different refrigerant components based on their individual properties, with HFO-1132(E) providing low GWP characteristics and R32/R1234yf contributing to refrigerating capacity, creating local optimization within the mixture
3Object-affected harmful factors
If refrigerant composition is optimized for low GWP, then environmental compatibility improves, but flammability may increase
Solution Approach 1:
The patent controls the mass percentage parameters of flammable components R32 and R1234yf within specific ranges to limit flammability while maintaining low GWP characteristics through the presence of HFO-1132(E)
Solution Approach 2:
The patent uses HFO-1132(E) as a non-flammable intermediary component that dilutes and stabilizes the mixture, reducing the overall flammability risk while preserving the low GWP benefits of the other components
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 proposed solution achieves a refrigerating capacity ratio of 80% or more relative to R410A, a GWP of 350 or less, and lower flammability, making it suitable as a low-GWP alternative for refrigerant cycle apparatuses.
Implementation Method 1
a heat absorber... The refrigerant contains at least 1,2-difluoroethylene
Implementation Method 2
heat absorber... refrigerant cycle apparatus for freezing or cold storage
Implementation Method 3
a radiator... refrigerant cycle apparatus for freezing or cold storage
Implementation Method 4
a compressor... refrigerant circuit includes a compressor
Implementation Method 5
a decompressing portion... refrigerant circuit includes a decompressing portion
Data Source
AI summary
A showcase includes a refrigerant circuit and a refrigerant enclosed in the refrigerant circuit. The refrigerant circuit includes a compressor (121), a radiator (122), an expansion valve (123), and an evaporator (124). The refrigerant is a low-GWP refrigerant.