Refrigerator Composition with Low Hydroxyl Base Oil
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Solution Overview
Problem
The practical use of refrigerants containing HFO in compression-type refrigerators faces challenges with varying discharge temperatures and the need for improved thermal and oxidation stability, which affects the lifetime and efficiency of the refrigeration system.
Innovation Solution
A composition comprising a mixed refrigerant with a specific blend of saturated fluorinated hydrocarbons (HFC) like difluoromethane (R32) and 1,1,1,2,2-pentafluoroethane (R125), combined with an unsaturated fluorinated hydrocarbon (HFO) such as 2,3,3,3-tetrafluoropropene (R1234yf), and a base oil with a hydroxy number of 15 mgKOH/g or less, selected from polyvinyl ether, polyalkylene glycol, and polyol ester, to enhance thermal and oxidation stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a mixed refrigerant containing HFO and HFC is used to reduce global warming potential, then environmental performance is improved, but thermal stability and oxidation stability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the refrigerant mixture by specifying precise mass ratio ranges of HFO (10-40%) and HFC components (R32, R125, R134a). It also changes the base oil parameters by limiting hydroxyl value (≤15 mgKOH/g) and specifying viscosity ranges, thereby achieving both low GWP and improved stability
Solution Approach 2:
The patent creates a composite refrigerant composition by combining multiple components: HFO (unsaturated fluorinated hydrocarbon), HFC (saturated fluorinated hydrocarbon), and a specifically formulated base oil. This composite approach allows the mixture to achieve properties that individual components cannot provide alone, particularly balancing environmental performance with thermal and oxidation stability
2Object-affected harmful factors
If a new mixed refrigerant is used, then global warming potential is reduced, but discharge temperature varies causing system reliability to worsen
Solution Approach 1:
The patent adjusts the compositional parameters of the refrigerant mixture, specifically the ratio of HFO to HFC components and the selection of base oil properties, to control the discharge temperature characteristics. By optimizing these parameters within specified ranges, the system achieves stable discharge temperature despite using a new low-GWP refrigerant formulation
3Object-affected harmful factors
If refrigerant composition is changed to lower GWP, then environmental performance is improved, but lifetime of refrigeration system deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the refrigerant composition, including the specific ratios of HFO and HFC components and the base oil characteristics (hydroxyl value, viscosity). These parameter changes are designed to enhance chemical stability and reduce degradation, thereby extending system lifetime while maintaining low GWP
Solution Approach 2:
The patent employs a composite refrigerant formulation combining HFO, HFC, and a specially selected base oil. This composite structure provides synergistic effects that improve long-term stability and durability of the refrigeration system, ensuring extended operational lifetime alongside environmental benefits
Data Source
AI summary
The present invention relates to a composition for refrigerator containing a mixed refrigerant, and a refrigerator oil containing a base oil (P), the mixed refrigerant containing a saturated fluorinated hydrocarbon compound (HFC) and an unsaturated fluorinated hydrocarbon compound (HFO), the saturated fluorinated hydrocarbon compound (HFC) containing at least difluoromethane (R32) and 1,1,1,2,2-pentafluoroethane (R125) in the particular amounts, the base oil (P) containing one or more kind selected from the group consisting of a polyvinyl ether (PVE), a polyalkylene glycol (PAG), and a polyol ester (POE), and the base oil (P) having a hydroxy number of 15 mgKOH/g or less.