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

Number: 2209

Author(s) : HAIDER S. A., MILJKOVIC N., ELBEL S.

Summary

The oil circulation ratio (𝑂𝐢𝑅) 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-𝑂𝐢𝑅 compressors, accurate and repeatable 𝑂𝐢𝑅 measurement becomes essential. Various 𝑂𝐢𝑅 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 𝑂𝐢𝑅 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 𝑂𝐢𝑅 measurements.

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Details

  • Original title: Modeling of flashing flows at evacuated sampling cylinder entrance during oil circulation ratio measurements for a vapor compression system.
  • Record ID : 30033084
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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