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http://hdl.handle.net/10397/79977
Title: | Cooling effectiveness of mist precooler for improving energy performance of air-cooled chiller | Authors: | Yu, FW Chan, KT Yang, J Sit, RKY |
Issue Date: | 2018 | Source: | Thermal science, 2018, v. 22, no. 1A, p. 193-204 | 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. | Keywords: | Air-cooled chiller Coefficient of performance Mist precooling |
Publisher: | Vinča Institute of Nuclear Sciences | Journal: | Thermal science | ISSN: | 0354-9836 | EISSN: | 0354-9836 | DOI: | 10.2298/TSC1151112071Y | Rights: | © 2017 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This is an open access article distributed under the CC BY-NC-ND 4.0 (https://creativecommons.org/licenses/by-nc-nd/4.0/) terms and conditions. The following publication Yu, F. W., Chan, K. T., Yang, J., & Sit, R. K. Y. (2018). Cooling effectiveness of mist precooler for improving energy performance of air-cooled chiller. Thermal Science, 22(1A), 193-204 is available at https://dx.doi.org/10.2298/TSC1151112071Y |
Appears in Collections: | Journal/Magazine Article |
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Yu_Cooling_Mist_Precooler.pdf | 3.64 MB | Adobe PDF | View/Open |
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