Design and performance evaluation of an R744 multi-temperature refrigerated container

Neal Lawrence, Stefan Elbel, Pega Hrnjak

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


This paper describes the design and experimental validation of a multi-temperature refrigerated container unit using transcritical R744 as the refrigerant. The unit is required to maintain refrigerated and frozen compartment temperatures of 3.3°C and -20.6°C at an ambient temperature of 57°C. The paper discusses the unique design challenges presented by a small-capacity (around 7 kW) R744 system operating at these extreme temperature conditions. A number of system improvements are implemented in order to meet the capacity requirements at the design condition, namely the addition of an internal heat exchanger (IHX) and an ejector for expansion work recovery to the cycle as well as the use of microchannel heat exchangers for gas coolers. The details of the design of the system and components to address the unique challenges of this application are discussed. Initial experimental results investigating the operating range of the compressor are presented.

Original languageEnglish (US)
Title of host publicationICR 2019 - 25th IIR International Congress of Refrigeration
EditorsVasile Minea
PublisherInternational Institute of Refrigeration
Number of pages8
ISBN (Electronic)9782362150357
StatePublished - 2019
Event25th IIR International Congress of Refrigeration, ICR 2019 - Montreal, Canada
Duration: Aug 24 2019Aug 30 2019

Publication series

NameRefrigeration Science and Technology
ISSN (Print)0151-1637


Conference25th IIR International Congress of Refrigeration, ICR 2019


  • Booster cycle
  • Energy efficiency
  • Refrigerated container
  • System design
  • Transcritical carbon dioxide

ASJC Scopus subject areas

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


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