Effects of an Ejector in a Refrigeration Cycle with Carbon Dioxide on its Cooling Coefficient of Performance and Cooling Capacity

Shogo Tamaki, Makoto Igarashi, Yuuko Fujii, Yohsuke Matsushita, Hideyuki Aoki, Takatoshi Miura, Koichiro Take, Hidemitsu Hamano

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of an ejector in a refrigeration cycle with carbon dioxide on its cooling capacity and cooling coefficient of performance were numerically analyzed. The effects of an ejector on the entrainment ratio of vapor mixing in suction flow, pressure difference of the suction chamber, environmental temperature, lower side pressure and higher side pressure were numerically investigated. The cooling coefficient of performance and cooling capacity decrease with an increace in vapor quality in suction flow. Furthermore, the cooling coefficient of performance and cooling capacity increase with an increase in pressure difference of the suction chamber. When the environmental temperature is low, the evaporator inlet pressure is low and the compressor discharge pressure is high, an ejector gives a larger cooling coefficient of performance and cooling capacity.

Original languageEnglish
Pages (from-to)513-521
Number of pages9
Journalkagaku kogaku ronbunshu
Volume34
Issue number5
DOIs
Publication statusPublished - 2008 Oct 6

Keywords

  • Carbon dioxide
  • Coefficient of performance
  • Ejector
  • Heat transfer rate
  • Refrigeration cycle

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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