Halogenated Alkene Refrigerant Composition for Improved Oil Return
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Solution Overview
Problem
The refrigeration industry faces challenges with low miscibility and oil return issues when using hydrofluorocarbon (HFC) refrigerants with traditional mineral oil lubricants, leading to inefficiencies and increased costs due to the need for oxygenated oils or surfactants, which can cause corrosion and incompatibility issues.
Innovation Solution
The use of halogenated alkenes, such as hydrofluoroolefins and hydrochlorofluoroolefins, which are miscible with hydrocarbon lubricating oils like mineral oil and alkyl benzene oil, improving oil flow and return without the need for surfactants or oxygenated oils, thereby enhancing the performance and compatibility of refrigerant compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydrofluorocarbon (HFC) refrigerants are used, then ozone depletion is reduced, but miscibility with mineral oil lubricants deteriorates leading to poor oil return
Solution Approach 1:
The patent uses small amounts of hydrocarbons (0.5-20% by weight) as intermediary substances to mediate between HFC refrigerants and mineral oil lubricants. The hydrocarbon component improves miscibility and oil return while the majority HFC content maintains low ozone depletion potential, thus resolving the contradiction between environmental protection and reliable oil return
Solution Approach 2:
The invention creates a composite refrigerant composition combining HFCs (for low ozone depletion) with hydrocarbons (for improved oil return). This composite approach allows the system to benefit from both components: the HFC portion provides environmental advantages while the hydrocarbon portion ensures adequate lubricant miscibility and oil circulation
2Reliability
If oxygenated lubricants (POE, PAG, PVE) are used to improve miscibility with HFCs, then oil return improves, but hygroscopicity increases leading to acid formation and corrosion
Solution Approach 1:
The patent extracts the oil return function from oxygenated lubricants by using hydrocarbon-based lubricants combined with small amounts of hydrocarbon refrigerant components. This eliminates the need for hygroscopic POE/PAG/PVE lubricants while maintaining adequate oil return through the hydrocarbon-HFC-lubricant combination, thus removing the source of corrosion and sludge problems
Solution Approach 2:
The invention replaces expensive, problematic oxygenated lubricants with cheaper, more stable hydrocarbon lubricants. The small amount of hydrocarbon in the refrigerant composition (0.5-20%) provides sufficient miscibility improvement to enable reliable oil return with traditional mineral or alkyl benzene lubricants, eliminating the need for costly POE/PAG/PVE alternatives
3Reliability
If hydrocarbons are added to improve miscibility, then oil return improves, but flammability risk increases
Solution Approach 1:
The patent carefully controls the concentration parameter of hydrocarbon in the refrigerant composition, limiting it to 0.5-20% by weight. This parameter optimization provides sufficient hydrocarbon content to improve miscibility and oil return while maintaining the majority HFC content that suppresses flammability, thus resolving the contradiction between oil return improvement and safety
Solution Approach 2:
The invention applies local quality by introducing hydrocarbon specifically in the amount needed for miscibility improvement (0.5-20% portion) while the remaining 80-99.5% HFC portion provides non-flammable characteristics. This localized application of hydrocarbon achieves the desired oil return benefit without compromising overall system safety
Data Source
AI summary
The invention relates to heat transfer agents and heat transfer compositions containing hydrocarbon lubricating oils and halogentaed alkene heat transfer fluid that promote oil flow and provide for improved oil return. The heat transfer compositions are useful in various heat transfer systems such as refrigeration, cooling, air conditioning, chiller operations.