Working fluid composition and refrigerator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing refrigerating machine working fluid compositions using unsaturated hydrofluorocarbon refrigerants like HFO-1234yf lack stability and refrigerant dissolution viscosity, necessitating improved formulations.
Innovation Solution
A novel working fluid composition comprising a refrigerating machine oil with specific base oils (polyol ester and polyvinyl ether) and additives (carbodiimide-based acid scavenger and phenol-based antioxidant) combined with refrigerants HFO-1132(E) and HFO-1234yf, optimized for refrigerant fraction and viscosity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional refrigerants like R134a or R125 are used, then refrigeration performance is maintained, but global warming potential and ozone depletion issues occur
Solution Approach 1:
The patent uses composite refrigerant formulations combining HFO-1234ze(E) as the base refrigerant with specific proportions of R125 (5-15 mass%), R134a (5-30 mass%), and R32 (5-20 mass%). This composite approach maintains refrigeration performance while achieving low GWP values below 150, resolving the contradiction between environmental protection and system reliability.
2Object-affected harmful factors
If natural refrigerants like propane or isobutane are used, then environmental friendliness is improved, but flammability hazards increase
Solution Approach 1:
The patent applies local quality by assigning different functional roles to each refrigerant component: HFO-1234ze(E) provides base cooling with non-flammable properties, R125/R134a/R32 enhance refrigeration efficiency in controlled proportions, and the specific composition ranges ensure the mixture remains non-flammable while maintaining excellent refrigeration performance and zero ozone depletion potential.
3Object-affected harmful factors
If HFO-1234ze(E) is used as pure refrigerant, then GWP is reduced below 150, but refrigeration performance and lubricating oil compatibility deteriorate
Solution Approach 1:
The patent changes the compositional parameters by formulating a multi-component mixture where HFO-1234ze(E) constitutes 65-90 mass% to maintain low GWP below 150, while precisely controlling the addition of R125 (5-15 mass%), R134a (5-30 mass%), and R32 (5-20 mass%) to optimize refrigeration performance, heat transfer characteristics, and lubricating oil compatibility, thereby resolving the performance deterioration issue.
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
Enhances refrigerant dissolution viscosity and stability under specified temperature and pressure conditions, surpassing compositions using HFO-1234yf alone and other oils, ensuring superior performance in refrigerating machines.
Implementation Method 1
a refrigerant composition comprising a compound of formula (1) and/or its stereoisomers, or a mixture containing a compound of formula (1) and/or its stereoisomers as an active substance
Implementation Method 2
wherein R1 to R6 independently represent a hydrogen atom or a methyl group, with the proviso that R1 and R2, R3 and R4, or R5 and R6 are not two methyl groups, respectively
Implementation Method 3
improving the global warming potential and the ozone depletion potential
Data Source
Figure 1
Figure 2
AI summary
A working fluid composition containing a refrigerating machine oil; and a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)) and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the working fluid composition has a refrigerant fraction at 80°C and 2.5 MPa of 80% by mass or less, wherein the refrigerating machine oil contains: at least one base oil selected from the group consisting of a polyol ester and a polyvinyl ether; a carbodiimide-based acid scavenger; and a phenol-based antioxidant.