Étude expérimentale des stratégies et méthodes de régulation pour le fonctionnement hors conception du cycle à éjecteur diphasique transcritique au R744

Translated title of the contribution: Experimental investigation on control methods and strategies for off-design operation of the transcritical R744 two-phase ejector cycle

Neal Lawrence, Stefan Elbel

Research output: Contribution to journalArticle

Abstract

Numerous recent studies have demonstrated the significant opportunity to enhance vapor-compression cycle COP by integration of a two-phase ejector, especially for transcritical CO2 cycles. However, this significant improvement in performance relies on proper control of the ejector cycle. This paper investigates different methods for controlling the high-side pressure of a transcritical CO2 ejector cycle. The use of an ejector with an adjustable motive nozzle throat area as well as a simple expansion valve in series or parallel with a fixed-geometry ejector to actively control high-side pressure are investigated over a range of conditions. Additionally, proper control of evaporator flow rate, which is often overlooked in studies addressing ejector cycle control, for different conditions is also investigated. Ejector cycle control is investigated over a range of capacities and ambient temperatures in order to see the performance penalties to a transcritical CO2 ejector cycle when it is not controlled properly.

Translated title of the contributionExperimental investigation on control methods and strategies for off-design operation of the transcritical R744 two-phase ejector cycle
Original languageFrench
Pages (from-to)570-582
Number of pages13
JournalInternational Journal of Refrigeration
Volume106
DOIs
StatePublished - Oct 2019

Keywords

  • Adjustable ejector
  • Cycle optimization
  • Ejector
  • Evaporator performance
  • Expansion work recovery

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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