Effects of the cylinder volume ratio of a twin rotary compressor on the heating performance of a vapor injection CO2 cycle

Changhyun Baek, Jaehyeok Heo, Jongho Jung, Honghyun Cho, Yong Chan Kim

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The injection mass flow rate in a vapor injection CO2 cycle is an important design factor to improve the heating performance of a heat pump at low ambient temperatures. The intermediate pressure in a twin rotary compressor strongly affects the injection mass flow rate, and can be adjusted by the cylinder volume ratio of the second-stage to the first-stage. In this study, the heating performances of the vapor injection CO2 cycles including the flash tank vapor injection (FTVI) and sub-cooler vapor injection (SCVI) cycles were measured by varying the cylinder volume ratio of the twin rotary compressor at the ambient temperature of -15 °C. From the results, the optimum injection ratio yielding the maximum COP was determined for each cylinder volume ratio. In addition, in the FTVI and SCVI cycles, the optimum cylinder volume ratio was determined as 0.7 in order to achieve the maximum COP with the designed heating capacity.

Original languageEnglish
Pages (from-to)89-96
Number of pages8
JournalApplied Thermal Engineering
Volume67
Issue number1-2
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • Cylinder volume ratio
  • Heating performance
  • Twin rotary compressor
  • Two-stage
  • Vapor injection

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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