Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17273
Title: Economic benefits of optimal control for water-cooled chiller systems serving hotels in a subtropical climate
Authors: Yu, FW
Chan, KT 
Keywords: Cooling tower
Economic analysis
Optimum control
Water-cooled chiller
Issue Date: 2010
Publisher: Elsevier
Source: Energy and Buildings, 2010, v. 42, no. 2, p. 203-209 How to cite?
Journal: Energy and buildings 
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.
URI: http://hdl.handle.net/10397/17273
ISSN: 0378-7788
EISSN: 1872-6178
DOI: 10.1016/j.enbuild.2009.08.016
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