Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30649
Title: Effects of discharge recirculation in cooling towers on energy efficiency and visible plume potential of chilling plants
Authors: Ge, G
Xiao, F 
Wang, S 
Pu, L
Keywords: Control strategy
Energy efficiency
Evaporative cooling tower
Recirculation
Visible plume
Issue Date: 2012
Publisher: Pergamon Press
Source: Applied thermal engineering, 2012, v. 39, p. 37-44 How to cite?
Journal: Applied thermal engineering 
Abstract: Due to limited space and/or improper placement of evaporative cooling towers, discharge recirculation likely occurs in practical applications. The air recirculation may adversely affect energy efficiency of the chilling plants and increase the potential of visible plume around the towers. In this study, the amount of recirculation in a counter-flow cooling tower is evaluated by computational fluid dynamics (CFD) simulation tests under different enclosure structures and crosswind conditions. Then the effects of recirculation in cooling towers on energy performance of a chilling plant and plume potential are investigated. The evaluation is conducted on a dynamic simulation platform using the weather data in a typical meteorological year of Hong Kong. Results show that crosswind can enhance recirculation in cooling towers under lower air flow rate conditions. The recirculation ratio can reach up to 15%. Results also reveal that air recirculation in cooling towers could result in the increase of overall chilling plant energy consumption by over 1.5%. The recirculation also results in significant increase of plume occurrence frequency, particularly in spring season.
URI: http://hdl.handle.net/10397/30649
ISSN: 1359-4311
EISSN: 1873-5606
DOI: 10.1016/j.applthermaleng.2012.01.043
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