Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18011
Title: Modelling of the coefficient of performance of an air-cooled screw chiller with variable speed condenser fans
Authors: Yu, FW
Chan, KT 
Keywords: Air-cooled screw chiller
Coefficient of performance
Condenser fans
Variable speed control
Issue Date: 2006
Publisher: Pergamon Press
Source: Building and environment, 2006, v. 41, no. 4, p. 407-417 How to cite?
Journal: Building and environment 
Abstract: Air-cooled chillers are generally recognized as energy intensive equipment in air-conditioned buildings in the subtropical climate. This paper considers how the use of variable speed condenser fans enables these chillers to operate more efficiently. The thermodynamic model of an air-cooled screw chiller was developed using the simulation program TRNSYS and validated using the field data and specifications of the chiller. The staging of condenser fans and the control of their speed in various operating conditions were described. A comparison was made on the coefficient of performance of the chiller in the steady state with various control strategies: head pressure control with constant or variable speed condenser fans; condensing temperature control (CTC) with constant or variable speed condenser fans. Potential improvements in the chiller COP due to the use of CTC with variable speed condenser fans were discussed. The findings of this paper are useful in developing more energy efficient air-cooled chillers.
URI: http://hdl.handle.net/10397/18011
ISSN: 0360-1323
EISSN: 1873-684X
DOI: 10.1016/j.buildenv.2005.02.002
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