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Multi Ejector and pivoting-supported R744 application with AC for supermarkets

Abstract

CO2 refrigeration units are gaining market shares thanks to the ability to provide an energy efficient
performance for industrial and commercial refrigeration applications in any climate. As with all the
applications, the investment and operation costs should be kept as low as possible, to reduce the payback time
and promote the introduction of innovative system solutions.
In this work the flexibility achieved by implementing the pivoting technology in a supermarket refrigeration
application is investigated both at design- and partial load conditions. The air conditioning (AC) load is also
considered within a wide range of ambient temperatures. The Multi Ejector block utilized will be analyzed in
terms of performance and its effect on the compressor combinations at different operating conditions. The
objective is to increase the flexibility of the centralized rack through a proper design and sizing of the
compressor pack equipped with the pivoting technology, while maintaining the efficiency and reducing the
investment costs. This work shows that a Multi Ejector pivoting-supported system will be beneficial from the
flexibility and capital costs point of view, and the benefit will be more consistent if the AC load is part of the
integrated system architecture. Furthermore, a thorough investigation has been conducted whenever the ejector
capacity is too high compared to the load, proposing two alternative solutions.

Category

Academic chapter/article/Conference paper

Client

  • Research Council of Norway (RCN) / 257632

Language

English

Author(s)

Affiliation

  • Norwegian University of Science and Technology
  • SINTEF Energy Research / Termisk energi

Year

2021

Publisher

International Institute of Refrigeration

Book

9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings

Issue

2021

ISBN

978-2-36215-046-3

Page(s)

148 - 160

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