Thermodynamic analysis of regenerated air-cycle refrigeration in high and low pressure configuration

N. Giannetti, A. Milazzo

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A thermodynamic analysis is performed on open, regenerated, inverse air-cycles, focussing on low temperature refrigeration, in order to provide general optimization criteria, support for a rational configuration choice and potential performance improvement for this specific application. The effect of high regenerator effectiveness (0.95) is explored, showing that it may double the air cycle COP in the case at hand. Low and high pressure configurations (i.e. featuring only one heat exchanger on the cold or hot cycle side) are compared. High pressure configuration, normally preferred in the field of low temperature refrigeration, has a lower efficiency, but the gap reduces as regenerator effectiveness increases. Avoidance of a cold heat exchanger eliminates frosting problems and power input for the circulation fan, so that the small COP decrease suffered by the high pressure cycle can easily be compensated for and eventually yield higher average plant efficiency. The feasibility of such a highly effective regenerator, already reported in the literature, is demonstrated using classic Kays and London (1964) data.

Original languageEnglish
Pages (from-to)97-110
Number of pages14
JournalInternational Journal of Refrigeration
Volume40
DOIs
Publication statusPublished - 2014 Apr 1
Externally publishedYes

Keywords

  • Air cycle
  • Low temperature refrigeration
  • Regenerator

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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