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Design optimization of R744 ejector for compressor oil pumping.

Number: 2274

Author(s) : ALAM M., ELBEL S.

Summary

Standard two-phase refrigerant ejectors have been widely considered for the recovery of expansion work in vapor compression refrigeration systems so far. However, one innovative way through which ejectors could be utilized in HVAC&R systems is to pump the compressor lubricant logged in the evaporator as well as other system components and ensure improved oil return to the compressor with time. In this regard, the design of an ejector dedicated to oil pumping is crucial and the design guidelines could be very different from that of the standard two-phase ejector. For design procedures of an oil ejector, no literature study has ever been reported. This paper presents an approach for gaining insights about the design of ejectors dedicated to oil pumping considering a suitable ejector cycle. This unconventional ejector cycle might be very important for some immiscible refrigerant-lubricant combinations concerning HVAC&R systems. Initially, numerical modeling has been performed regarding this ejector model for compressor lubricant pumping. Preliminary modeling results reveal insights about the bypass flow required to pump the compressor oil and ensure oil return to the compressor. An experimental layout of the oil entrainment test setup is designed and integrated with the existing test facility for the standard two-phase ejector cycle. For initial test experiments, standard two-phase R744 ejectors can be used to get insights about the oil entrainment capability for fixed motive flow rates. In the next step, different motive flow rates and pressures are considered in a wide range of operating conditions to assess the oil entrainment capability through the ejector of fixed geometry conditions. Depending upon the results from these sets of experiments, the ejector design for oil pumping can be optimized.

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Pages: 10 p.

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  • Original title: Design optimization of R744 ejector for compressor oil pumping.
  • Record ID : 30030640
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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