Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19964
Title: Improved condenser design and condenser-fan operation for air-cooled chillers
Authors: Yu, FW
Chan, KT 
Keywords: Air-cooled chillers
Coefficient of performance
Evaporative pre-cooler
Variable speed condenser fans
Issue Date: 2006
Publisher: Pergamon Press
Source: Applied energy, 2006, v. 83, no. 6, p. 628-648 How to cite?
Journal: Applied energy 
Abstract: Air-cooled chillers traditionally operate under head pressure control via staging constant-speed condenser fans. This causes a significant drop in their coefficient of performance (COP) at part load or low outdoor temperatures. This paper describes how the COP of these chillers can be improved by a new condenser design, using evaporative pre-coolers and variable-speed fans. A thermodynamic model for an air-cooled screw-chiller was developed, within which the condenser component considers empirical equations showing the effectiveness of an evaporative pre-cooler in lowering the outdoor temperature in the heat-rejection process. The condenser component also contains an algorithm to determine the number and speed of the condenser fans staged at any given set point of condensing temperature. It is found that the chiller's COP can be maximized by adjusting the set point based on any given chiller load and wet-bulb temperature of the outdoor air. A 5.6-113.4% increase in chiller COP can be achieved from the new condenser design and condenser fan operation. This provides important insights into how to develop more energy-efficient air-cooled chillers.
URI: http://hdl.handle.net/10397/19964
ISSN: 0306-2619
EISSN: 1872-9118
DOI: 10.1016/j.apenergy.2005.05.007
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