Share

IIR document

Experimental and evaluation methods for miscibility of short chain olefin refrigerants with lubricating oil.

Type of article: IJR article

Summary

New generation environmentally friendly short-chain olefin refrigerants have become a focal point in refrigeration and energy sector research due to their superior thermal properties. Comprehensive studies on the miscibility of these refrigerants with lubricating oils are still lacking. A real-time multi-camera visualization system was designed and constructed for miscibility testing. The evaluation method, based on elemental contributions, molecular polarity, dispersive forces, olefin molecular configurations, and lubricating oil viscosity, was developed. Findings revealed that R1150 and R1270 are fully miscible with PVE32. R1234yf showed immiscibility with mineral oils and was miscible below the Critical Miscibility Temperature (CMT) when mixed with PVE68. At an oil concentration of 15%, the CMT peaked at -43.5 ◦C. R1233zd(E) was found to be fully miscible with non-mineral oils, exhibiting parabolic-like CMT curves with 3GS/4GS, peaking at -23.5 ◦C and -21 ◦C respectively at an oil concentration of 15%. Based on dynamic observations of phase transitions, the R1233zd (E)/3GS and R1234yf/PVE68 were defined as having five stages. The durations of these stages and the corresponding microscopic morphological changes were quantified. The novel evaluation method effectively determines the miscibility between olefin refrigerants and lubricating oils.

Available documents

Format PDF

Pages: 10 p.

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Experimental and evaluation methods for miscibility of short chain olefin refrigerants with lubricating oil.
  • Record ID : 30034353
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 179
  • Publication date: 2025/11
  • DOI: http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2025.07.031

Links


See other articles in this issue (29)
See the source

Indexing