Economic benefits of optimal control for water-cooled chiller systems serving hotels in a subtropical climate

F. W. Yu, K. T. Chan

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

A water-cooled chiller system in an air-conditioned hotel can take up about one-quarter of the total electricity consumption and considerable amounts of water in the heat rejection process. This paper evaluates operating cost savings of a chiller system integrated with optimal control of cooling towers and condenser water pumps. A sophisticated chiller system model was used to ascertain how different control methods influence the annual electricity and water consumption of chillers operating for the cooling load profile of a reference hotel. It is estimated that applying load-based speed control to the cooling tower fans and condenser water pumps could reduce the annual system electricity use by 8.6% and operating cost by 9.9% relative to the equivalent system using constant speed fans and pumps with a fixed set point of 29.4 °C for cooling water temperature control. The ways to implement this advanced control for system optimization are discussed.

Original languageEnglish
Pages (from-to)203-209
Number of pages7
JournalEnergy and Buildings
Volume42
Issue number2
DOIs
Publication statusPublished - Feb 2010

Keywords

  • Cooling tower
  • Economic analysis
  • Optimum control
  • Water-cooled chiller

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