Greenhouse ventilation rates through combined roof and side openings: An experimental study

dc.contributor.author	Kittas, C	en
dc.contributor.author	Papadakis, G	en
dc.contributor.author	Boulard, T	en
dc.date.accessioned	2014-06-06T06:43:15Z
dc.date.available	2014-06-06T06:43:15Z
dc.date.issued	1997	en
dc.identifier.issn	05677572	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/1121
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-33749334184&partnerID=40&md5=5099ec16158c72255997350dce3e4214	en
dc.subject	Chimney and wind effects	en
dc.subject	Mediterranean greenhouse	en
dc.subject	Natural ventilation	en
dc.title	Greenhouse ventilation rates through combined roof and side openings: An experimental study	en
heal.type	conferenceItem	en
heal.publicationDate	1997	en
heal.abstract	A simple statistical relation between the ventilation rate of a greenhouse and its roof and side openings was proposed and tested on experimental data. This relation combines thermal buoyancy and wind effects as driving forces of the natural ventilation. It is shown that both effects are dependent on the total area of openings. The wind effect is related to a global wind-dependence coefficient. In our experimental conditions the wind effect predominates over the chimney effect when the ratio of wind velocity to the square root of air temperature difference becomes greater than 1. The comparison between the combined roof and side ventilation system and the roof alone system shows that for typical conditions of temperature difference (=5 K), the first ventilation system is more efficient than the second for wind velocities smaller than 2.5 ms-1 because of the significant role of the chimney effect.	en
heal.journalName	Acta Horticulturae	en
dc.identifier.volume	443	en
dc.identifier.spage	31	en
dc.identifier.epage	38	en