Performance evaluation and modeling of a hybrid cooling system combining a screw water chiller with a ground source heat pump in a building

Jongug Jeon, Sunil Lee, Daehie Hong, Yong Chan Kim

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33 Citations (Scopus)


The performance of a hybrid cooling system that combines a screw water chiller with a ground source heat pump (GSHP) was measured and analyzed at various cooling loads. In addition, the hybrid cooling system in a building was modelled sophisticatedly using EnergyPlus and then validated with the measured data. The coefficient of performance of the GSHP was lower than that of a conventional chiller in the monitored building, but the hybrid cooling system helped to stably provide the required cooling capacity at high-load conditions. The mean bias error and the normalized root-mean squared error of the predicted cooling load of the building were -8% and 12.4%, respectively. The hybrid cooling system was simulated by varying four operating parameters: the operating schedule, chilled water temperature (TCW), dry-bulb temperature (TDB), and entering water temperature (TEW). The TCW is ascertained as being the most effective control parameter in the hybrid cooling system.

Original languageEnglish
Pages (from-to)2006-2012
Number of pages7
Issue number5
Publication statusPublished - 2010 May 1



  • Ground source heat pump (GSHP)
  • HVAC system
  • Modeling
  • Screw water chiller

ASJC Scopus subject areas

  • Energy(all)
  • Pollution

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