Mathematical modeling and thermodynamic investigation of the use of two-phase ejectors for work recovery and liquid recirculation in refrigeration cycles

Neal Lawrence, Stefan Elbel

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents the results of a numerical investigation on the performance of ejector cycles in which the work recovered is used to recirculate liquid through the evaporator. The ejector recirculation cycle, in which the ejector is only used to recirculate liquid and improve evaporator performance, and the standard ejector cycle, in which the ejector can be used to both recirculate liquid and directly unload the compressor, are investigated. The analysis uses a microchannel evaporator and refrigerants R134a, R410A, and CO2. It is seen that fluids that have large throttling loss but gain little benefit from liquid recirculation (CO2) should use the ejector to directly unload the compressor, while fluids that have lower throttling loss but gain significant benefit from liquid recirculation (R134a) should use the ejector to improve evaporator performance through liquid recirculation. It is also seen that the ejector recirculation cycle is better suited for ejector off-design operation.

Original languageEnglish (US)
Pages (from-to)41-52
Number of pages12
JournalInternational Journal of Refrigeration
Volume58
DOIs
StatePublished - Oct 1 2015

Keywords

  • Cycle comparison
  • Evaporator overfeed
  • Expansion work recovery
  • Liquid recirculation
  • Two-phase ejector

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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