Effect of cold inflow on chimney height of natural draft cooling towers

Chu, Christopher and Rahman, Mizanur Mizanur Gohar and Kumaresan, Sivakumar (2012) Effect of cold inflow on chimney height of natural draft cooling towers. Nuclear Engineering and Design , 249 . pp. 125-131. ISSN 0029-5493

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Official URL: http://dx.doi.org/10.1016/j.nucengdes.2011.08.046

Abstract

Temperature and pressure drop data obtained from an air-cooled heat exchanger model with cross-sectional flow areas of 0.56 m², 1.00 m² and 2.25 m² operating under natural convection are presented that indicate significant cold inflow, resulting in the reduction of effective chimney height. Cold inflows encountered in actual applications where the Froude number is typically 0.2, may not be as severe as described in this paper, which was of the order of 10 ¯⁶₋₁₀¯⁴. Additional tests on smaller scale models appeared to favor the explanation that the occurrence of cold inflow in the air-cooled heat exchanger model was primarily due to the relative ease in either drawing cold air from inlet or from outlet, and to a lesser extent the Froude number of the chimney or the critical velocity estimated by Jörg and Scorer's (1967) formula. A CFD study will bring much understanding of the phenomenon for the different situations.

Item Type:Article
Uncontrolled Keywords:Air-cooled heat exchanger, Cold air, Critical velocities, Flow area, Natural draft cooling towers, Scale models, Cooling systems, Froude number, Heat exchangers, Chimneys
Subjects:?? TH7005-7699 ??
Divisions:SCHOOL > School of Engineering and Information Technology
ID Code:5424
Deposited By:IR Admin
Deposited On:30 Nov 2012 15:50
Last Modified:18 Feb 2015 10:31

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