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Effects of orientation and valve opening speed on oil circulation rate measurements using an evacuated type sampling cylinder.

Number: 2214

Author(s) : HAIDER S. A., WANG X., ELBEL S.

Summary

The lubricating oil used in vapor compression systems helps to reduce the wear and tear between the moving parts of the compressor and in the long run extends the useful life of the compressor. But at the same time, the oil can leave the compressor and be in circulation or get held up in certain locations. The percentage by mass of oil present in the oil-refrigerant mixture which moves through the system is known as the oil circulation rate (OCR). The OCR can affect the system performance, so accurate knowledge of OCR and OCR measurement is crucial. The ASHRAE standard 41.4 describes the method of OCR measurement through sampling using an evacuated type sampling cylinder, but this method can often be open to interpretation. Factors such as sampling cylinder orientation, shape and size, valve opening speed, etc. can influence the OCR measurements, but the standard provides little to no information regarding these.
The present study investigates OCR sampling results for different evacuated sampling cylinder orientations, namely, horizontal, vertically downward, and vertically upward flow to a dead end. The flow patterns inside the sampling cylinders were visualized by using transparent sampling cylinders and high-speed camera. The study also compares the OCR results obtained with the sampling cylinder valves opened at different speeds for the different orientations.

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  • Original title: Effects of orientation and valve opening speed on oil circulation rate measurements using an evacuated type sampling cylinder.
  • Record ID : 30030609
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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