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Experimental Study of Wind Effects on Unglazed Transpired Collectors

Title:

Experimental Study of Wind Effects on Unglazed Transpired Collectors

Vasan, N. and Stathopoulos, T. (2014) Experimental Study of Wind Effects on Unglazed Transpired Collectors. Solar Energy, 101 . pp. 138-149.

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Official URL: http://dx.doi.org/10.1016/j.solener.2013.11.037

Abstract

High wind velocity affects the performance of unglazed transpired collectors (UTC); indeed, wind flow on the collector’s surface reduces useful heat transferred to the collector fluid by effectuating convection losses and suction in the pores and thereby outflow from the plenum. Wind does not impinge uniformly on all points on a large area; the velocity distribution depends on wind direction and surroundings of the concerned area. The paper describes an experimental and analytical parametric study to assess the effect of wind on UTCs. Velocity measurements obtained using wind-tunnel experiments were applied to analytical models of UTC performance evaluation and were found to influence UTC performance. The assumption that a reference wind speed acts uniformly throughout the UTC area, as opposed to the more realistic non-uniform distribution, resulted in the overestimation of heat exchange effectiveness up to 50% and underestimation of convective heat transfer coefficients up to 20%. The importance of using actual velocity distribution, as opposed to an assumed uniform velocity distribution in building simulation, has been discussed.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering
Item Type:Article
Refereed:Yes
Authors:Vasan, N. and Stathopoulos, T.
Journal or Publication:Solar Energy
Date:2014
Digital Object Identifier (DOI):10.1016/j.solener.2013.11.037
ID Code:981623
Deposited By: THEODORE STATHOPOULOS
Deposited On:20 Sep 2016 15:25
Last Modified:18 Jan 2018 17:53
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