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Passive Evaporative Cool Tower Study

Analysis and Evaluation of a Passive Evaporative Cool Tower in Conjunction with a Solar Chimney

Mar 11th, 2008

Passive evaporative cooling is one of the most efficient and long recognized ways of inducing thermal comfort in predominantly hot and arid climates. In order to extend the use of evaporative cooling, a downdraft evaporative ‘cool tower’ was integrated at the Solar Lab at ASU’s School of Architecture and Landscape Architecture.

The model explains how elevated temperature and pressure differences can increase the efficiency of a cooling tower and how adding a solar chimney can create that elevated pressure difference. The synergy created by the cool incoming air through the cool tower (positive pressure) and the hot air exiting through the solar chimney (negative pressure) will alter the air movement and therefore the fluid dynamics.

This research analyzed the indoor air velocity increment and the indoor air movement, as well as the possible heat gains through convection and conduction due to increased air circulation. To accomplish this research, a scaled model was built at the Solar Laboratory of the College of Architecture and Environmental Design where we executed, monitored and collected data for a period from 25th April to 5th June, 2005. The time for data under consideration for the paper was 24 hours from 9:17 AM, May 31st to 9:17 AM, June 1st.

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