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Evaluation of refrigeration lubricants for low GWP refrigerants.

Number: 1474

Author(s) : YOSHIDA K., MATSUMOTO T., KITA S., MAEZONO H.

Summary

Hydrofluorocarbon (HFC) refrigerants have been replaced by various low global warming potential (GWP) refrigerants in refrigeration systems due to the regulations on greenhouse gas emissions, such as the 2016 Kigali Amendment to the Montreal Protocol. While next-generation hydrofluoroolefin (HFO) refrigerants like R448A and R454C have relatively low GWP, they exhibit lower thermal stability compared to traditional HFC refrigerants. This issue poses a challenge for drop-in replacement in HFC systems with HFO refrigerants, impacting the thermal stability of refrigeration lubricants. In this report, we have conducted thermal stability evaluations of refrigeration lubricants intended for drop-in systems transitioning from HFC refrigerants to HFO refrigerants. In HFO refrigerants, the appropriate stabilizer has reduced the increasing acid number of refrigeration oils. We confirmed the critical importance of using appropriate stabilizers in thermal stability tests for drop-in replacements from HFC to HFO refrigerants.

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  • Original title: Evaluation of refrigeration lubricants for low GWP refrigerants.
  • Record ID : 30033620
  • Languages: English
  • Subject: Regulation
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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