Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/65376
Title: Economic analysis of air-cooled chiller with advanced heat rejection [Analyse économique d'un refroidisseur à air avec système de rejet thermique avancé]
Authors: Yu, FW
Ho, WT
Chan, KT
Sit, RKY
Yang, J
Keywords: Air-cooled chiller
Condenser fan
Mist precooling
Random forest
Variable speed control
Issue Date: 2017
Publisher: Elsevier
Source: International journal of refrigeration, 2017, v. 73, p. 54-64 How to cite?
Journal: International journal of refrigeration 
Abstract: This study analyses economic benefits of an air-cooled chiller retrofitted with advanced heat rejection features. The rated capacity was 282 kW and operating variables were monitored comprehensively to develop random forest models. The top five variables to ensure model accuracy were identified. Electricity savings were predicted by the models with 3 advanced operating modes: variable speed control for condenser fans with an adjustable condensing temperature (the VSD mode), mist precooling of condenser air (the Mist mode), and their composites (the VSD + Mist mode). The integrated part load value (IPLV) was 2.90, 3.31, 2.93 and 3.34 for the normal mode, VSD mode, Mist mode, and the VSD + Mist mode, respectively. For a chiller system serving an office building, the VSD mode gave the highest economic benefit with a simple payback of 10.83 yrs and an internal rate of return of 4.38% over a 15-yr life cycle.
URI: http://hdl.handle.net/10397/65376
ISSN: 0140-7007
EISSN: 1879-2081
DOI: 10.1016/j.ijrefrig.2016.09.016
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