Refrigeration cycle apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing refrigeration cycle apparatuses face challenges in replacing refrigerants like R32 due to high condensing pressures and potential disproportionation reactions of HFO1123, while requiring refrigerants with lower global warming potential and ozone depletion potential.
Innovation Solution
A refrigeration cycle apparatus using a refrigerant composition of R1234yf, HFO1123, and R290 in specific mass ratios, which suppresses disproportionation reactions and maintains pressure resistance, allowing retrofitting into existing systems without altering pressure specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO1123 is used as refrigerant to reduce global warming potential, then GWP is reduced to about 0.3, but disproportionation reaction occurs under high temperature and high pressure conditions
Solution Approach 1:
The patent uses a composite refrigerant system containing HFO1123 combined with other refrigerants (such as R32, R125, or R134a) to create a mixture that maintains chemical stability while preserving the low GWP benefits of HFO1123. The composite composition prevents disproportionation reactions by diluting HFO1123 with stabilizing components.
Solution Approach 2:
The patent modifies the chemical composition parameters of the refrigerant system by introducing specific ratios of HFO1123 mixed with other refrigerants. This parameter change optimizes both the GWP reduction and chemical stability, ensuring the refrigerant mixture remains stable under high temperature and pressure conditions while maintaining environmental benefits.
2Reliability
If R744 is added to suppress disproportionation reaction of HFO1123, then chemical stability is improved, but condensing pressure increases beyond existing apparatus pressure resistance
Solution Approach 1:
The patent adjusts the composition ratios of refrigerant components to control condensing pressure within acceptable limits. By optimizing the mixture ratios of HFO1123, R32, R125, or R134a, the patent achieves chemical stability without allowing condensing pressure to exceed the pressure resistance of existing apparatus.
Solution Approach 2:
The patent applies different refrigerant component ratios for different operating conditions and system configurations. The composition is tailored to match the specific pressure resistance capabilities of existing apparatus while maintaining chemical stability and low GWP.
3Object-affected harmful factors
If R32 is replaced with low GWP refrigerant, then global warming influence is reduced, but pressure resistance compatibility with existing apparatus is compromised
Solution Approach 1:
The patent creates a composite refrigerant mixture that combines HFO1123 with other refrigerants having different pressure characteristics. This composite approach allows the system to achieve low GWP while maintaining pressure levels compatible with existing apparatus pressure resistance.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the refrigerant mixture to match the operating parameters of existing R32-based systems. By carefully selecting component ratios, the patent ensures that condensing pressure and other critical parameters remain within the adaptability range of existing apparatus.
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 composition achieves lower global warming potential, maintains safety and performance, and ensures compatibility with existing refrigeration cycle apparatuses, while suppressing flammability and disproportionation reactions.
Implementation Method 1
HFO1123, however, is prone to disproportionation reaction under high temperature and high pressure conditions
Data Source
AI summary
A refrigeration cycle apparatus includes a refrigeration circuit including a compressor, an outdoor heat exchanger, an indoor heat exchanger, and an expansion valve, refrigerant is enclosed in the refrigeration circuit, the refrigerant contains three components R1234yf, HFO1123, and R290, a composition diagram is represented by triangular coordinates includes: a point A representing R1234yf/HFO1123/R290=100/0/0% by mass, a point B representing R1234yf/HFO1123/R290=85/0/15% by mass, a point C representing R1234yf/HFO1123/R290=20/80/0% by mass, and a point D representing R1234yf/HFO1123/R290=6.2/78.8/15% by mass, the mass ratio between the three components falls in a first range enclosed by a straight line 1 connecting the point A to the point B, a straight line 2 connecting the point A to the point C, a straight line 3 connecting the point B to the point D, and a curve 1 connecting the point C to the point D.