Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 495071
Title Optimalisering Ventilationjet systeem
Author(s) Weel, P.A. van
Source Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1376) - 38 p.
Department(s) WUR GTB Tuinbouw Technologie
Publication type Research report
Publication year 2015
Keyword(s) glastuinbouw - klimaatregeling - kastechniek - snijbloemen - sierteelt - gerbera - kunstmatige ventilatie - energiebesparing - thermische schermen - greenhouse horticulture - air conditioning - greenhouse technology - cut flowers - ornamental horticulture - artificial ventilation - energy saving - thermal screens
Categories Cut Flowers / Cropping Systems
Abstract The Ventilationjet system is used to dehumidify a greenhouse with a fully closed blackout screen during the night. Gerbera producer Zuijderwijk and Witzier in the Netherlands uses this equipment but was not satisified with the duhumidification capacity since the RH was rising to unwanted levels. That forced him to pull a gap in the screens but that resulted in local temperature drops and botrytis. In this research project the cause of the high humidity was found to be the result of a combination of unwanted transpiration from the floor area and a limited air supply through the screens as a result of a turbulent flow in the outlet of the fans. The problem was fixed by developing a new version of the Ventilationjet where the air was supplied through a vertical duct instead of a simple round opening in the screens. Also the air supply capacity was increased from 3 m3/m2.hr to 14 m3/ m2.hr with a speed controllable fan. In addition, measures were taken to prevent humid, warm air to reach the area above the blackout screen by guiding this air to a central opening in the screen above the concrete path in the middle of the greenhouse. The ventilation windows above this ventilation gap in the screen release this humid air to the outside world, without causing a temperature drop since the fans create an overpressure.
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