Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/7730
Title: Environmental performance and economic analysis of all-variable speed chiller systems with load-based speed control
Authors: Yu, FW
Chan, KT 
Keywords: Electricity and water consumption
Simulation
Variable speed
Water-cooled chiller
Issue Date: 2009
Publisher: Pergamon Press
Source: Applied thermal engineering, 2009, v. 29, no. 8-9, p. 1721-1729 How to cite?
Journal: Applied thermal engineering 
Abstract: There are increasing views on implementing all-variable speed chiller plants in place of conventional constant speed plants. Supporters of these views claim that all-variable speed chiller systems can operate much more efficiently at part load in response to changes in building cooling load. This paper introduces load-based speed control for all-variable speed plants to optimize their environmental performance. Thermodynamic-behaviour chiller system models were developed to perform environmental assessment (in terms of annual electricity and water consumption) for typical constant speed and all-variable speed chiller systems operating for the cooling load profile of a local office building. Operating cost differences between the two systems were calculated and compared in an economic analysis. Applying load-based speed control to the variable speed chiller plant can decrease the annual total electricity use by 19.7% and annual water use by 15.9% relative to the corresponding constant speed plant. The significance of this study is to provide more insights into how to make chiller systems more sustainable.
URI: http://hdl.handle.net/10397/7730
ISSN: 1359-4311
EISSN: 1873-5606
DOI: 10.1016/j.applthermaleng.2008.08.003
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