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Title: Cooling effectiveness of mist precooler for improving energy performance of air-cooled chiller
Authors: Yu, FW 
Chan, KT 
Yang, J 
Sit, RKY 
Keywords: Air-cooled chiller
Coefficient of performance
Mist precooling
Issue Date: 2018
Publisher: Vinča Institute of Nuclear Sciences
Source: Thermal science, 2018, v. 22, no. 1, pt. A, p. 193-204 How to cite?
Journal: Thermal science 
Abstract: Mist is increasingly applied to precool outdoor air in heat rejection. This study investigates how the coefficient of performance of an air-cooled chiller varies with a mist precooler at different levels of cooling effectiveness. A multi-variate regression model was developed to simulate the operating variables of an air-cooled chiller with mist precooling. The model was validated with typical performance data of an air-cooled centrifugal chiller. The coefficient of performance would increase by up to 30%, depending on the cooling effectiveness and the wet bulb depression - the difference between the dry bulb and wet bulb temperatures of outdoor air. At a large wet bulb depression, the percentage increase of coefficient of performance tended to correlate linearly with the chiller capacity. Yet at a small wet bulb depression, the dynamic control of condensing temperature resulted in a non-linear relationship between the percentage change of coefficient of performance and the cooling effectiveness. Further experimental work is required to optimize cooling effectiveness for the maximum coefficient of performance.
ISSN: 0354-9836
DOI: 10.2298/TSC1151112071Y
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