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Modélisation des écoulements instantanés à l’entrée d’un cylindre d’échantillonnage à évacuation lors des mesures du débit de circulation de l’huile pour un système à compression de vapeur.

Modeling of flashing flows at evacuated sampling cylinder entrance during oil circulation ratio measurements for a vapor compression system.

Numéro : 2209

Auteurs : HAIDER S. A., MILJKOVIC N., ELBEL S.

Résumé

The oil circulation ratio (𝑂𝐶𝑅) significantly impacts automotive air conditioning system performance, both at system and component levels. It represents the mass percentage of oil in a representative oil-refrigerant mixture sample drawn from the system at steady state. With industries increasingly favoring low-𝑂𝐶𝑅 compressors, accurate and repeatable 𝑂𝐶𝑅 measurement becomes essential. Various 𝑂𝐶𝑅 measurement techniques rely on calibration per ASHRAE standard 41.4, which outlines sampling using an evacuated cylinder connected to the system liquid line. However, factors like cylinder orientation and valve opening speed can influence 𝑂𝐶𝑅 results. During sampling, the initial flow contains liquid refrigerant and oil. As the sampling valve opens, refrigerant undergoes flashing, vapor recompression, and re-condensation, filling the cylinder until pressure equalization occurs. This two-phase, two-component, phase changing flow is complex, and for the present study, flow visualization using a high-speed camera and analytical tools are used to study the flashing flow entering an evacuated sampling cylinder. Insights gained shed light on how sampling cylinder orientation and valve speed can impact 𝑂𝐶𝑅 measurements.

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Pages : 10 p.

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Détails

  • Titre original : Modeling of flashing flows at evacuated sampling cylinder entrance during oil circulation ratio measurements for a vapor compression system.
  • Identifiant de la fiche : 30033084
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 17/07/2024

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