Feasibility of lowering the condenser's inlet water temperature of a chiller using thermal water storage

J. Asrael, Patrick Phelan, B. D. Wood

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

A novel approach is proposed for applying cool thermal storage to reduce the on-peak demand of a water-cooled chiller. By charging the store at night via a cooling tower, and using this water to supply the condenser of a chiller during on-peak hours, cooler than normal water is supplied to the chiller. A feasibility study of this system was conducted using TRNSYS - a transient simulation modeling program examining varying capacities of cooling tower and thermal store volumes. These systems were tested using geographic weather data that demonstrated conducive diurnal changes in wet-bulb temperature (Twet). Results suggest that the use of cool water thermal storage in this way can reduce both on-peak energy demand and on-peak power use by as much as 35%. System optimization is dependent on the thermal storage efficiency, the capacity of the cooling tower, and the diurnal change in Twet.

Original languageEnglish (US)
Pages (from-to)339-356
Number of pages18
JournalApplied Energy
Volume66
Issue number4
DOIs
StatePublished - Aug 2000

Keywords

  • Chiller
  • Condenser
  • Cool thermal storage
  • Wet-bulb temperature

ASJC Scopus subject areas

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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