Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8453
Title: Thermodynamic-behaviour model for air-cooled screw chillers with a variable set-point condensing temperature
Authors: Chan, KT 
Yu, FW
Keywords: Air-cooled chillers
Coefficient of performance
Condensing temperature
Screw compressors
Issue Date: 2006
Publisher: Pergamon Press
Source: Applied energy, 2006, v. 83, no. 3, p. 265-279 How to cite?
Journal: Applied energy 
Abstract: This paper presents a thermodynamic model to evaluate the coefficient of performance (COP) of an air-cooled screw chiller under various operating conditions. The model accounts for the real process phenomena, including the capacity control of screw compressors and variations in the heat-transfer coefficients of an evaporator and a condenser at part load. It also contains an algorithm to determine how the condenser fans are staged in response to a set-point condensing temperature. The model parameters are identified, based on the performance data of chiller specifications. The chiller model is validated using a wide range of operating data of an air-cooled screw chiller. The difference between the measured and modelled COPs is within ±10% for 86% of the data points. The chiller's COP can increase by up to 115% when the set-point condensing temperature is adjusted, based on any given outdoor temperature. Having identified the variation in the chiller's COP, a suitable strategy is proposed for air-cooled screw chillers to operate at maximum efficiency as much as possible when they have to satisfy a building's cooling-load.
URI: http://hdl.handle.net/10397/8453
ISSN: 0306-2619
EISSN: 1872-9118
DOI: 10.1016/j.apenergy.2005.01.009
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