07 May 2025

Oil Meets Cool: Inside the World of Lubricant-Refrigerant Properties

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The interaction between lubricants/oils and refrigerants plays a pivotal role in the performance and reliability of HVAC and refrigeration systems, yet it is often overlooked in system design. This article explores the dual impact of oil and natural refrigerants mixtures on thermophysical properties and heat transfer. It highlights how dissolved refrigerants affect lubricant behavior in the compressor, and conversely, how oil presence in the circulating refrigerant influences system efficiency. Through analysis of miscibility curves and thermodynamic behavior, particularly with propane (R290) and various synthetic oils, the article emphasizes the importance of selecting appropriate refrigerant-oil combinations. A comprehensive understanding of these interactions is essential for optimizing system performance and ensuring stable lubrication.