A laboratory experiment of shear-induced natural ventilation

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Title:	A laboratory experiment of shear-induced natural ventilation
Authors:	Chu,CR;Chen,RH;Chen,JW
Contributors:	土木工程學系
Keywords:	FLUCTUATING WIND PRESSURES;DRIVEN CROSS-VENTILATION;FLOW-RATES;BUILDINGS;SIMULATION;DESIGN;TUNNEL
Date:	2011
Issue Date:	2012-03-27 16:17:13 (UTC+8)
Publisher:	國立中央大學
Abstract:	When the wind direction is parallel to the opening facade, the wind shear near the building opening generates turbulence and entrains air across the opening. This kind of shear-induced ventilation cannot be predicted by the orifice equation because the time-averaged pressure difference across the opening is close to zero. This study uses wind tunnel experiments and the tracer gas decay method to investigate the ventilation rate of shear-induced ventilation. The influences of opening area A. external wind speed U and wind direction on the ventilation rates Q, of single-sided and two-sided openings are systemically examined. The experimental results indicate that the dimensionless ventilation rate, Q(center dot) = Q/UA, of shear-induced ventilation is independent of the wind speed and opening area, and the value of Q. of two-sided openings is larger than that of a single-sided opening. In addition, a cosine law was used to predict the ventilation rate of building with two-sided openings under various wind directions, and the results are compared with the prediction of the multizone ventilation model COMIS. (C) 2011 Elsevier B.V. All rights reserved.
Relation:	ENERGY AND BUILDINGS
Appears in Collections:	[Department of Civil Engineering] journal & Dissertation

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