Study on the use of ejectors for capacity modulation and performance improvement in CO2 commercial refrigeration systems

Neal Lawrence, Stefan Elbel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Expansion work recovery by means of a two-phase ejector is an attractive option for improving the efficiency of CO2 commercial refrigeration systems. However, the use of ejectors in a system subject to varying ambient conditions and capacity requirements presents a significant challenge, as ejectors have been seen to offer poor performance at off-design conditions. In order for ejector systems to be a realistic option for efficiency improvement, they must be able to operate efficiently at off-design and reduced capacity conditions. In this paper, existing CO2 ejector data from the open literature is analyzed in order to see the impact on ejector component and system performance for operating an ejector cycle at off-design conditions, and different methods for addressing the issue of off-design and reduced capacity operation of ejector cycles are discussed. A theoretical model is used to investigate the performance of different CO2 commercial refrigeration cycle configurations with two-phase ejectors.

Original languageEnglish (US)
Title of host publication24th IIR International Congress of Refrigeration, ICR 2015
PublisherInternational Institute of Refrigeration
Pages1816-1823
Number of pages8
ISBN (Electronic)9782362150128
DOIs
StatePublished - Jan 1 2015
Event24th IIR International Congress of Refrigeration, ICR 2015 - Yokohama, Japan
Duration: Aug 16 2015Aug 22 2015

Publication series

NameRefrigeration Science and Technology
ISSN (Print)0151-1637

Other

Other24th IIR International Congress of Refrigeration, ICR 2015
CountryJapan
CityYokohama
Period8/16/158/22/15

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Condensed Matter Physics

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