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 496378
Title Verbetering lichtinval winterlicht : Improving the availability of natural light in winter
Author(s) Kempkes, F.L.K.; Swinkels, G.L.A.M.; Hemming, S.
Source Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1375) - 55 p.
Department(s) WUR GTB Tuinbouw Technologie
Publication type Research report
Publication year 2015
Keyword(s) glastuinbouw - kasgewassen - kastechniek - constructie - natuurlijk licht - lichtdoorlating - condenseren - diffuus glas - greenhouse horticulture - greenhouse crops - greenhouse technology - construction - natural light - light transmission - condensation - diffused glass
Categories Greenhouse Technology / Horticulture
Abstract In winter at northern latitudes light is the limiting factor for crop growth. The design of the Venlo greenhouse has not changed for many years although the development of diffuse glass and use of Anti Reflection coatings were only recent. This report shows results of Ray-tracing calculations of the effect of several measures as roof slope, ridge orientation, symmetry of the roof, reflection of the construction elements and the effect of condensation on light transmission of the greenhouse. Results show that it is possible to increase light transmission by more than 10% in case a combination of measures are taken. Effects of standard glass on transmission are higher than with diffuse glass. The measurements on the effect of condensation shows a hugh variation but in average condensation can cost you light, 2% (standard glass) but can gain light as well, up to 6%. Economic feasibility and restrictions in constructions are not taken into account. The optimal winter light greenhouse means a complete re-design of the Venlo type greenhouse cover.
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