Refrigerant Composition Transfer Method to Maintain Blend Stability
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Solution Overview
Problem
The challenge lies in maintaining the compositional integrity of refrigerant compositions containing difluoromethane, pentafluoroethane, and 1,1,1,2-tetrafluoroethane during transfer, as the phase transition leads to significant compositional changes due to varying boiling points, affecting performance and safety, and it is difficult to predict these changes accurately.
Innovation Solution
Adjusting the proportions of the components in the refrigerant composition before transfer to specific ranges (e.g., 32.5-33.5 wt% difluoromethane, 14.3-16.0 wt% pentafluoroethane, and 50.5-53.2 wt% 1,1,1,2-tetrafluoroethane) ensures that the compositional change falls within a tolerance range, even at high transfer rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the refrigerant composition is extracted from the liquid phase during transfer, then the phase transition is avoided, but compositional change still occurs due to pressure decrease and gas phase expansion
Solution Approach 1:
The patent applies parameter changes by adjusting the initial composition ratios of HFC-32, HFC-125, and HFC-134a in the liquid phase before transfer. Specific ratio ranges are defined to compensate for expected compositional changes during transfer, ensuring the final composition remains within acceptable tolerances for performance and safety
2Stability of the object's composition
If the proportion of low boiling point component is increased to compensate for evaporation loss, then compositional change is compensated, but flammability risk increases
Solution Approach 1:
The patent uses parameter changes by defining specific ratio ranges for HFC-32 (low boiling point) relative to HFC-125 and HFC-134a. These ranges are carefully calculated to compensate for evaporation losses while maintaining the composition below flammability thresholds, thus resolving the contradiction between compositional stability and safety
Solution Approach 2:
The patent implements a feedback mechanism by establishing tolerance ranges for final composition after transfer. The initial composition is adjusted based on expected changes, and the final composition is verified to remain within acceptable limits, creating a closed-loop approach to maintaining both performance and safety
3Productivity
If high transfer rate is used to improve productivity, then transfer efficiency increases, but compositional change becomes more significant
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the composition ratios in the liquid phase before transfer begins. The initial composition is specifically formulated to account for and compensate for the compositional changes that will occur during high-rate transfer, allowing fast transfer without sacrificing compositional stability
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
This method ensures that the compositional change of the liquid phase during transfer remains within a tolerance range, thereby maintaining refrigerant performance and safety, and preventing flammability risks.
Implementation Method 1
When the refrigerant composition undergoes phase transition, such as evaporation or condensation, a component having a low boiling point is likely to evaporate, while a component having a high boiling point is likely to condense
Implementation Method 2
a component having a low boiling point is likely to evaporate
Data Source
AI summary
Provided is a method for transferring a refrigerant composition containing three components (difluoromethane, pentafluoroethane, and 1,1,1,2-tetrafluoroethane) such that the compositional change of the liquid phase due to the phase transition that occurs in the supply source when transferring the refrigerant composition falls within a tolerance range. The method for transferring a refrigerant composition containing difluoromethane, pentafluoroethane, and 1,1,1,2-tetrafluoroethane includes transferring a refrigerant composition from a liquid phase in a supply source to a supply destination, wherein the liquid phase of the refrigerant composition in the supply source before the transfer contains 32.5 to 33.5 wt % of difluoromethane, 14.3 to 16.0 wt % of pentafluoroethane, and 50.5 to 53.2 wt % of 1,1,1,2-tetrafluoroethane.