Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on the Operating Control of a Heat Pump System with Screw Compressors

스크류 열펌프 시스템의 운전제어 방안에 관한 연구

  • Park, Jun-Tark (Department of Energy Efficiency, Korea Institute of Energy Research(KIER)) ;
  • Lee, Young-Soo (Department of Energy Efficiency, Korea Institute of Energy Research(KIER)) ;
  • Kim, Jiyoung (Department of Energy Efficiency, Korea Institute of Energy Research(KIER)) ;
  • Chae, Kyu-Jung (Environmental Technology Lab, R&BD Center, Kolon Global Corp.) ;
  • Yang, Hee-Jung (Environmental Technology Lab, R&BD Center, Kolon Global Corp.)
  • 박준택 (한국에너지기술연구원(KIER) 에너지효율연구단) ;
  • 이영수 (한국에너지기술연구원(KIER) 에너지효율연구단) ;
  • 김지영 (한국에너지기술연구원(KIER) 에너지효율연구단) ;
  • 채규정 (코오롱글로벌(주) R&BD Center 환경기술연구소) ;
  • 양희정 (코오롱글로벌(주) R&BD Center 환경기술연구소)
  • Received : 2013.01.24
  • Published : 2013.03.10
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Abstract

A preliminary performance test of a 30RT 2-stage screw heat pump was carried out in order to develop a high performance large-scale unutilized energy source heat pump system, which will be used for district heating and cooling. In this study, two issues of the system operating control were investigated. The first issue is the mode switching control from 1-stage to 2-stage. A stable 2-stage heating operation is guaranteed, only if the load-side water inlet temperature is over a certain value, where the 1-stage heating operation should be done first from a cold start. The second issue is oil level control. An oil shortage problem in the low stage compressor, which depends on the degree of suction superheat, was solved by a proper oil level control scheme.

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References

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