Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11999
Title: Modelling of a condenser-fan control for an air-cooled centrifugal chiller
Authors: Yu, FW
Chan, KT 
Keywords: Air-cooled chiller
Centrifugal compressor
Condenser fan
Condensing temperature
Thermodynamic model
Issue Date: 2007
Publisher: Pergamon Press
Source: Applied energy, 2007, v. 84, no. 11, p. 1117-1135 How to cite?
Journal: Applied energy 
Abstract: There is a lack of detailed experimental and simulation studies on air-cooled centrifugal chillers. This paper investigates how to optimize the control of condenser fans within the chillers to maximize their coefficients of performance (COPs). A thermodynamic model for the chillers was developed and used to analyse the steady-state COP under various load and ambient conditions. An algorithm is introduced to compute the number of staged condenser fans based on settings of the condensing pressure and outdoor temperature. The model was validated using the experimental data and performance data of an existing chiller running under various operating conditions. It is found that the best strategy for switching condenser fans is to vary their rotating speed by the use of a set point of the condensing temperature, which is adjusted in response to the chiller load and condenser air-inlet temperature. The results of this paper provide an important insight into how to increase the COPs of air-cooled chillers.
URI: http://hdl.handle.net/10397/11999
ISSN: 0306-2619
EISSN: 1872-9118
DOI: 10.1016/j.apenergy.2007.05.004
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