CO2 Mixed Refrigerant Composition for Oil Compatibility
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Solution Overview
Problem
The compatibility of mixed refrigerants containing carbon dioxide with refrigerator oils varies depending on their composition, leading to unsatisfactory performance in existing refrigerator compositions.
Innovation Solution
A composition for a refrigerator comprising a mixed refrigerant with hydrofluorocarbon compounds and carbon dioxide, combined with a refrigerator oil containing polyvinyl ether or polyol ester, optimized within specific mass percentage ranges to enhance compatibility and reduce global warming potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If carbon dioxide is used as a refrigerant to reduce global warming potential, then environmental performance is improved, but compatibility with refrigerator oil becomes problematic
Solution Approach 1:
The patent uses a composite refrigerant composition containing carbon dioxide (25-65 mass%), hydrofluorocarbon compound (35-75 mass%), and optionally unsaturated hydrofluorocarbon compound (0.1-20 mass%). This composite approach allows the system to benefit from carbon dioxide's low GWP while the hydrofluorocarbon and HFO components improve compatibility with polyol ester refrigerator oil, resolving the contradiction between environmental performance and oil compatibility
Solution Approach 2:
The patent specifies precise composition ranges for each component (CO2: 25-65 mass%, HFC: 35-75 mass%, HFO: 0.1-20 mass%) and pairs it with specific refrigerator oil types (polyol ester with 80-100 mass% polyol ester content). By controlling these parameters within defined ranges, the system achieves both low global warming potential and reliable compatibility between refrigerant and lubricant
2Object-affected harmful factors
If mixed refrigerant composition is optimized for low global warming potential, then environmental performance is improved, but compatibility in the entire refrigerator composition varies
Solution Approach 1:
The patent defines specific composition ranges (CO2: 25-65 mass%, HFC: 35-75 mass%, HFO: 0.1-20 mass%) and pairs them with specific refrigerator oil specifications (polyol ester content: 80-100 mass%). This parameter control ensures stable compatibility throughout the system while maintaining low GWP
Solution Approach 2:
The hydrofluorocarbon compound and unsaturated hydrofluorocarbon compound act as intermediaries that improve the compatibility between carbon dioxide and polyol ester refrigerator oil. These components mediate the interaction between CO2 and the lubricant, ensuring stable composition compatibility while preserving the low environmental impact of carbon dioxide
Data Source
Figure 1
AI summary
Provided is a composition for a refrigerator that is a mixture of a mixed refrigerant containing carbon dioxide, the mixed refrigerant being a refrigerant having a low global warming potential, and a refrigerator oil excellent in compatibility with the mixed refrigerant. The composition for a refrigerator is a composition for a refrigerator, including: a mixed refrigerant; and a refrigerator oil containing a base oil, wherein the mixed refrigerant contains a hydrofluorocarbon compound and carbon dioxide, and wherein the base oil contains one or more kinds selected from the group consisting of: a polyvinyl ether; and a polyol ester.