Transcritical R744 multi-temperature refrigerated container system designed for high ambient temperature operation

Neal Lawrence, Stefan Elbel, Pega Hrnjak

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

Abstract

The paper describes the experimental evaluation of a transcritical R744 system designed to serve in a multi-temperature refrigerated container unit. The high ambient temperatures often encountered in this application, especially for a fluid like CO2, require careful attention to compressor selection and gas cooler design. To evaluate different compressor options, a laboratory breadboard CO2 system was used to test a single-stage compressor compared to an enhanced system with multi-stage compression and intercooler plus an ejector for improved evaporator performance and pressure lift. The results of the experimental evaluation show that the single-stage compression system is limited to an ambient temperature of about 40°C, while the multi-stage compression system is able to operate with sufficient capacity at ambient temperature in excess of 50°C. Also presented is the actual prototype CO2 refrigerated container unit to be evaluated.

Original languageEnglish (US)
Title of host publication6th IIR Conference on Sustainability and the Cold Chain, ICCC 2020 - Proceedings
PublisherInternational Institute of Refrigeration
Pages197-204
Number of pages8
ISBN (Electronic)9782362150364
DOIs
StatePublished - 2020
Event6th IIR Conference on Sustainability and the Cold Chain, ICCC 2020 - Nantes, France
Duration: Aug 26 2020Aug 28 2020

Publication series

NameRefrigeration Science and Technology
Volume2020-August
ISSN (Print)0151-1637

Conference

Conference6th IIR Conference on Sustainability and the Cold Chain, ICCC 2020
CountryFrance
CityNantes
Period8/26/208/28/20

Keywords

  • Booster Cycle
  • Carbon Dioxide (CO, R744)
  • Energy Efficiency
  • High Ambient Temperature
  • Refrigerated Container
  • System Design
  • Two-Phase Ejector

ASJC Scopus subject areas

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

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