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The solubility of refrigerants in lubricating oil is a crucial property that determines system characteristics and machine life, and is also an important basis for evaluating refrigerant alternatives. The solubility of refrigerants in lubricating oil is an important thermodynamic property of mixed refrigerant systems, and it is also the main factor determining whether the refrigerant system can be widely used Based on the mutual solubility of refrigerant and lubricating oil, the solubility of refrigerant in lubricating oil is crucial for the stable and reliable operation of the refrigeration system. In the compressor, the refrigerant will also dissolve in the lubricating oil, causing a decrease in the working viscosity of the lubricating oil. The working viscosity of lubricating oil is too small, which makes it difficult to form an oil film and affects the lubrication effect. Moreover, the sealing performance is poor, and the refrigerant is prone to leakage; The working viscosity of lubricating oil is too high, the flow resistance increases, and the power consumption of the compressor increases. When a large amount of refrigerant is dissolved in the lubricating oil, the decrease in working viscosity causes the oil film to become thinner, which in turn leads to poor resistance and wear reduction performance of the lubricating oil, as well as a decrease in load-bearing capacity. Energy loss increases with the increase in refrigerant solubility. On the other hand, the high solubility of refrigerant in lubricating oil can cause a large amount of lubricating oil to be taken away during the refrigerant circulation process, affecting the cooling, sealing, and lubrication performance of the lubricating oil in the compressor. In evaporators and condensers, the refrigerant containing lubricating oil can lead to a decrease in its heat transfer coefficient and an increase in pressure drop. At the same time, the refrigerant cannot evaporate after being dissolved in the lubricating oil, and the corresponding reduction in latent heat can also lead to a decrease in system performance The purpose of this article is to study and test the solubility of environmentally friendly refrigerants in lubricating oil, provide accurate and reasonable refrigerant/lubricating oil basic physical property data for the optimization design of refrigeration systems, and also provide theoretical basis for the synthesis and selection of lubricating oil in environmentally friendly refrigerant refrigeration systems Sample Preparation Samples: R32 refrigerant, a certain POE oil Test conditions Test instrument: VLE2000 solubility tester Test method: Equal volume saturation method Test temperature: 273K~353K Test conclusion The solubility of R32 in POE base oil decreases with increasing temperature and increases with increasing pressure. . This is because as the temperature increases, the thermal motion of refrigerant molecules intensifies, making it easier for refrigerant molecules to escape from the base oil. Moreover, as the temperature increases, the distance between molecules increases, the gravitational effect weakens, and the viscosity of the base oil decreases, making it easier for gas molecules to escape. When the pressure increases, the distance between molecules decreases, the gravitational effect increases, and the viscosity of the base oil increases, making it difficult for gases to escape Testing standard Product name Testing item Testing standard Solubility of refrigerant in refrigerant oil Isovolumetric saturation methodFunction of testing report:1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report 2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems100% inspection and testing process:1. Telephone communication and confirmation of requirements 2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:1. The testing industry is fully covered, meeting different testing needs 2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate 4. Free initial testing, with no testing fees charged 5. Self service order delivery for free on-site sampling 6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China
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