Method for filling refrigerant mixture containing HFO-1132(e) and HFO-1234yf
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Solution Overview
Problem
The composition of non-azeotropic refrigerant mixtures comprising trans-1,2-difluoroethylene (HFO-1132(E)) and 2,3,3-tetrafluoropropene (HFO-1234yf) changes significantly during transfer due to differences in boiling points, affecting performance and safety.
Innovation Solution
A refrigerant mixture filling method that adjusts the proportion of HFO-1132(E) in the liquid phase of the mixture before transfer to specific ranges, using fill constants based on specific gravity at 45°C or 65°C, to maintain composition changes within acceptable limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the refrigerant mixture is transferred from source container to target container, then the refrigerant can be filled into the target container, but the composition of the non-azeotropic mixture changes significantly due to different boiling points
Solution Approach 1:
The source container is pre-filled to a specific level (50-90% of total capacity) before transfer begins. This preliminary filling state ensures that during the transfer process, the liquid-vapor equilibrium maintains a stable composition ratio, preventing significant composition changes in the transferred refrigerant mixture.
Solution Approach 2:
The invention controls the filling ratio parameter of the source container (50-90% of total capacity) to optimize the transfer process. By adjusting this parameter, the composition stability of the non-azeotropic mixture is maintained during transfer, resolving the contradiction between ease of operation and composition stability.
2Quantity of substance
If the source container is filled to maximum capacity, then the storage efficiency is improved, but the composition change during transfer becomes more significant
Solution Approach 1:
The invention optimizes the source container filling ratio to 50-90% of total capacity. This parameter adjustment balances the quantity of refrigerant stored with the composition stability during transfer, preventing excessive composition changes while maintaining efficient storage.
Solution Approach 2:
Instead of filling the source container to 100% capacity, the invention uses partial filling (50-90%). This partial action approach ensures that there is sufficient liquid-vapor equilibrium space to maintain composition stability during transfer, while still achieving adequate storage capacity.
3Reliability
If the refrigerant mixture has different boiling point components, then the refrigerant performance can be optimized, but the composition separates during transfer
Solution Approach 1:
The source container is prepared in advance with a specific filling ratio (50-90% capacity) to establish stable liquid-vapor equilibrium before transfer. This preliminary preparation ensures that the non-azeotropic mixture maintains its designed composition ratio during the subsequent transfer process, preventing separation of components with different boiling points.
Solution Approach 2:
By controlling the filling ratio parameter within 50-90% of total capacity, the invention maintains the thermal equilibrium conditions necessary for non-azeotropic mixture stability during transfer, preserving both refrigerant performance and composition integrity.
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 method ensures that composition changes during transfer remain within a controlled range, preserving refrigerant performance and safety.
Implementation Method 1
the composition of non-azeotropic refrigerant mixtures comprising trans-1,2-difluoroethylene (HFO-1132(E)) and 2,3,3-tetrafluoropropene (HFO-1234yf) changes significantly during transfer due to differences in boiling points
Implementation Method 2
the proportion of HFO-1132(E) in the liquid phase of the refrigerant mixture in the source container before the transfer
Data Source
AI summary
An object of the present invention is to provide a filling method for a refrigerant mixture comprising HFO-1132(E) and HFO-1234yf, the method enabling control of composition changes of a non-azeotropic refrigerant mixture comprising HFO-1132(E) and HFO-1234yf during refrigerant transfer to keep the composition changes within an acceptable range for refrigerant performance.