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Document IIF

Méthodes d’expérimentation et d’évaluation pour la miscibilité de frigorigènes à base d’oléfines à chaîne courte et d’huile lubrifiante.

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

Type d'article : Article de la RIF

Résumé

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.

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Format PDF

Pages : 10 p.

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    20 €

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Détails

  • Titre original : Experimental and evaluation methods for miscibility of short chain olefin refrigerants with lubricating oil.
  • Identifiant de la fiche : 30034353
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 179
  • Date d'édition : 11/2025
  • DOI : http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2025.07.031

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