Natural cross-ventilation in buildings: Building-scale experiments, numerical simulation and thermal comfort evaluation

Stavrakakis, GM; Koukou, MK; Vrachopoulos, MGr; Markatos, NC

dc.contributor.author	Stavrakakis, GM	en
dc.contributor.author	Koukou, MK	en
dc.contributor.author	Vrachopoulos, MGr	en
dc.contributor.author	Markatos, NC	en
dc.date.accessioned	2014-03-01T01:28:50Z
dc.date.available	2014-03-01T01:28:50Z
dc.date.issued	2008	en
dc.identifier.issn	0378-7788	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18988
dc.subject	Buoyancy	en
dc.subject	CFD	en
dc.subject	Cross-ventilation	en
dc.subject	Natural ventilation	en
dc.subject	Thermal comfort	en
dc.subject	Turbulence	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Civil	en
dc.subject.other	Air pollution	en
dc.subject.other	Buildings	en
dc.subject.other	Energy utilization	en
dc.subject.other	Global warming	en
dc.subject.other	Thermal comfort	en
dc.subject.other	Buoyancy effects	en
dc.subject.other	Natural cross ventilation	en
dc.subject.other	Natural ventilation	en
dc.subject.other	Ventilation	en
dc.title	Natural cross-ventilation in buildings: Building-scale experiments, numerical simulation and thermal comfort evaluation	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.enbuild.2008.02.022	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enbuild.2008.02.022	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	The constantly increasing energy consumption due to the use of mechanical ventilation contributes to atmospheric pollution and global warming. An alternative method to overcome this problem is natural ventilation. The proper design of natural ventilation must be based on detailed understanding of airflow within enclosed spaces, governed by pressure differences due to wind and buoyancy forces. In the present study, natural cross-ventilation with openings at non-symmetrical locations is examined experimentally in a test chamber and numerically using advanced computational fluid dynamics techniques. The experimental part consisted of temperature and velocity measurements at strategically selected locations in the chamber, during noon and afternoon hours of typical summer days. External weather conditions were recorded by a weather station at the chamber's site. The computational part of the study consisted of the steady-state application of three Reynolds-Averaged Navier-Stokes (RANS) models modified to account for both wind and buoyancy effects: the standard k-epsilon, the RNG k-epsilon and the so-called "realizable" k-epsilon models. Two computational domains were used, corresponding to each recorded wind incidence angle. It is concluded that all turbulence models applied agree relatively well with the experimental measurements. The indoor thermal environment was also studied using two thermal comfort models found in literature for the estimation of thermal comfort under high-temperature experimental conditions. (C) 2008 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Energy and Buildings	en
dc.identifier.doi	10.1016/j.enbuild.2008.02.022	en
dc.identifier.isi	ISI:000257349700007	en
dc.identifier.volume	40	en
dc.identifier.issue	9	en
dc.identifier.spage	1666	en
dc.identifier.epage	1681	en