Numerical study on the optimal design of injection-hole geometries of a twin rotary compressor in a liquid injection heat pump

Yongseok Jeon, Sang Hun Lee, Wonuk Kim, Jongho Jung, Yong Chan Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In a liquid injection heat pump, it is very essential to control the compressor discharge temperature without wet-compression problems at extreme outdoor conditions. The objective of this study was to optimize the injection-hole geometries of a liquid injection heat pump in order to prevent the risk of wet-compression while reducing compressor discharge temperature at overload cooling conditions. In this study, a simulation model for predicting the performance of a liquid injection heat pump was developed and validated. The optimum injection-hole geometries were determined to obtain the maximum multiplication ratio, which led to a lower instant injection mass flow rate in terms of R- and θ-directional positions. In addition, the injection-hole diameter was minimized to prevent wet-compression while obtaining the target injection mass flow rate. The discharge temperature of the optimized compressor was decreased by 9.2 °C over the baseline compressor while maintaining the same risk for wet-compression at the overload cooling test condition.

Original languageEnglish
Pages (from-to)1178-1188
Number of pages11
JournalApplied Thermal Engineering
Volume113
DOIs
Publication statusPublished - 2017 Feb 25

Keywords

  • COP
  • Liquid injection
  • Refrigeration cycle
  • Rotary compressor
  • Simulation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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