Proceedings of the SAREK Conference (대한설비공학회:학술대회논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on the Operating Control of a 2-Stage Heat Pump System with Screw Compressors

스크류 2단 압축 열펌프 시스템의 운전 제어 방안에 관한 연구

  • Kim, Ji-Young (Unutilized and Geothermal Energy Research Center, Korea Institute of Energy Research(KIER)) ;
  • Baik, Young-Jin (Unutilized and Geothermal Energy Research Center, Korea Institute of Energy Research(KIER)) ;
  • Lee, Young-Soo (Unutilized and Geothermal Energy Research Center, Korea Institute of Energy Research(KIER)) ;
  • Ra, Ho-Sang (Unutilized and Geothermal Energy Research Center, Korea Institute of Energy Research(KIER))
  • 김지영 (한국에너지기술연구원(KIER) 미활용.지열에너지연구센터) ;
  • 백영진 (한국에너지기술연구원(KIER) 미활용.지열에너지연구센터) ;
  • 이영수 (한국에너지기술연구원(KIER) 미활용.지열에너지연구센터) ;
  • 나호상 (한국에너지기술연구원(KIER) 미활용.지열에너지연구센터)
  • Published : 2006.06.21
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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, which will be used in district heating and cooling. Two issues on the system control were investigated in this study, A stable 2-stage heating operation is guaranteed only if the load-side water inlet temperature is over a certain value, to where the 1-stage heating operation should be done first from a cold start. An oil shortage problem in low stage compressor, which depends on the degree of suction superheat, was solved by the proper oil level control scheme.

Keywords