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.

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Record number 525883
Title Impact van een schermkier boven het middenpad bij een Ventilationjet systeem
Author(s) Vanthoor, B.H.E.; Tsafaras, I.
Source Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Rapport GTB 1446) - 22
Department(s) WUR GTB Tuinbouw Technologie
Publication type Research report
Publication year 2017
Abstract Between growers there is discussion if a (controllable) gap above the central path of the greenhouse is needed to
extract the surplus of heat and vapour in a greenhouse equipped with artificial lights and Ventilation Jets. Based
on this discussion, this research was started at a tomato greenhouse with artificial lights to analyse the impact
of this gap. To determine the effectiveness of this gap, the air flow through the Ventilation Jet was measured
with an air flow measurement device, the air flow through the gap at the central path was determined using
air velocity sensors and horizontal temperature differences were measured with wireless temperature sensors.
Based on this study we can conclude that: (1) at this grower the measured flow of the Ventilationjet at 2 closed
screens (6.7 m3/m2/hour) was much lower than expected (12 m3/m2/hour); (2) the impact of the gap at the
central path was small (a maximum of 2.8% of the incoming air through the Ventilation Jets left the greenhouse
through this gap), the gap at this grower is this not needed since almost all air leaves the greenhouse through
the screens and; (3) in case that the artificial lights were switched on and both screens were closed, large
horizontal temperature differences of maximum 2.7°C occurred.
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