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 546071
Title Het verticale temperatuurprofiel in een tomaten kas uitgerust met belichting, 2 schermen en een VentilationJet systeem : Als onderdeel van het monitorings project
Author(s) Tsafaras, I.; Vanthoor, B.H.E.
Source Bleiswijk : Stichting Wageningen Research, Wageningen Plant Research, Business unit Glastuinbouw (Rapport Wageningen Plant Research GTB-817) - 42
Department(s) GTB Tuinbouw Technologie
Publication type Research report
Publication year 2018
Abstract During the current research the effect of greenhouse climate control equipment use on vertical air temperature profile as well as on the fruit temperature and flue gas concentration was studied. It was observed that when significant heat input (radiation) at the top of the crop takes place a vertical temperature gradient exists, with the bottom of the crop being colder than the top. This temperature gradient cannot be reduced by using only the lower vertical air circulation fans but it can be minimized by additional heat input at the bottom; this may result in excess heat that has to be removed (from the top of the greenhouse) through either natural ventilation or with the use of VentilationJets when the screens are deployed. During the studied period about a quarter of the daily gas use for heating took place at the same time when the VentilationJets were removing warm and humid air from the top of the greenhouse. The use of the VentilationJets was also important to prevent supra-optimal humidity levels. It was also found that minimum a ventilation is needed (especially on not windy days) to ensure that concentration of NOx will not rise up to dangerous for the crop levels
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