Pressure field and airflow at the opening of a naturally ventilated greenhouse

dc.contributor.author	Boulard, T	en
dc.contributor.author	Kittas, C	en
dc.contributor.author	Papadakis, G	en
dc.contributor.author	Mermier, M	en
dc.date.accessioned	2014-06-06T06:43:29Z
dc.date.available	2014-06-06T06:43:29Z
dc.date.issued	1998	en
dc.identifier.issn	00218634	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/1307
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0012472850&partnerID=40&md5=2b3572cd4a101d2ffa170e0af1fede8b	en
dc.title	Pressure field and airflow at the opening of a naturally ventilated greenhouse	en
heal.type	journalArticle	en
heal.publicationDate	1998	en
heal.abstract	Direct estimation of airflow at the vent opening by means of differential pressure measurements were performed in a twin-span greenhouse equipped with a continuous vent at the gutter. Application of Bernoulli's equation provided a spatial estimate of mean air velocities and turbulent flows through the opening. In the particular case investigated, a wind blowing parallel to the greenhouse ridge gave rise to an inflow at the downwind end of the ventilator. In qualitative terms, this result is in good agreement with previous measurements performed with sonic anemometers in the same greenhouse with the same wind conditions but, on average, the airflows deduced from the pressure measurements gave higher values. A global wind effect coefficient, deduced from the mean pressure measurements, is in good accord with the sonic anemometer and tracer gas measurements. © 1998 Silsoe Research Institute.	en
heal.journalName	Journal of Agricultural Engineering Research	en
dc.identifier.issue	1	en
dc.identifier.volume	71	en
dc.identifier.spage	93	en
dc.identifier.epage	102	en