Performance improvements of R744 Glass door merchandiser using low-cost two-phase ejector

Neal Lawrence, Stefan Elbel

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

Abstract

Glass door merchandisers are used in grocery and convenience stores to display chilled beverages or refrigerated foods. Among other possible choices for this application, carbon dioxide (R744, CO2) is seen as a promising low global warming potential (GWP) refrigerant alternative that is non-flammable and non-toxic. Earlier studies demonstrated that it is possible to design high-performance transcritical R744 glass door merchandiser systems that deliver cooling capacities and energy efficiencies that are comparable to results obtained with an R134a baseline system. In this present study, the performance of the R744 refrigeration system has been further improved by implementing a very small-scale ejector, a device that uses the expansion of a high-pressure fluid to provide a pumping effect to a low pressure fluid. A low-cost design has been devised and implemented. Performance of the improved system is compared against the baseline without ejector in terms of energy consumption and production pull-down times.

Original languageEnglish (US)
Title of host publication4th IIR International Conference on Sustainability and the Cold Chain, Proceedings
EditorsDon Cleland, Andrew East, James Carson, Richard Love
PublisherInternational Institute of Refrigeration
Pages33-40
Number of pages8
ISBN (Electronic)9782362150142
DOIs
StatePublished - 2016
Event4th IIR International Conference on Sustainability and the Cold Chain - Albany, Auckland, New Zealand
Duration: Apr 7 2016Apr 9 2016

Publication series

NameRefrigeration Science and Technology
Volume2016-January
ISSN (Print)0151-1637

Conference

Conference4th IIR International Conference on Sustainability and the Cold Chain
CountryNew Zealand
CityAlbany, Auckland
Period4/7/164/9/16

Keywords

  • Glass door merchandiser
  • Light commercial refrigeration
  • Low-cost miniature ejector
  • Transcritical CO

ASJC Scopus subject areas

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

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