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, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

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
JournalEnergy
Volume35
Issue number5
DOIs
Publication statusPublished - 2010 May

Bibliographical note

Funding Information:
This research was supported by Grant No. 2008NBLHME090000 from the Korea Institute of Energy and Resources Technology Evaluation and Planning. The authors gratefully acknowledge technical support from the EnergyPlus support team.

Keywords

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

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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