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 489920
Title Gebruik van hoogisolerende schermen in een komkommerteelt
Author(s) Janse, J.; Weel, P.A. van; Zwart, H.F. de
Source Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1361) - 36
Department(s) GTB Teelt & Gewasfysiologie
GTB Tuinbouw Technologie
Publication type Research report
Publication year 2015
Keyword(s) glastuinbouw - komkommers - energiebesparing - thermische schermen - schermen - klimaatregeling - greenhouse horticulture - cucumbers - energy saving - thermal screens - blinds - air conditioning
Categories Fruit Vegetables / Cropping Systems
Abstract In 2014 a greenhouse experiment was executed with a high-wire cucumber crop to measure the impact of a multiple layer system of energy screens. The screen systems that have been tested were: • 2 layers of aluminized cloth with a 5 cm cavity operated by a single sliding system closed all night. • 1 layer of high transparency, non-porous PVDF film on a second sliding system, closed all night and when heating was required, usually below an outside radiation level of 150-200 W/m2. • 1 layer of perforated transparent PE film, mounted alongside the double screen, closing as soon as the double screen opened and opening above an outside radiation level of 100-150 W/m2 to reduce the PAR light losses. The result was a 44% reduction in heating energy in the period of January to May compared to a glasshouse with a single energy screen. Production and product quality were comparable. The intense use of screens influenced the greenhouse climate. Plant temperature remained high because the radiation losses were limited. Since the opening and closing of the screens were very gradual, no shocks in plant temperature or vapour deficit occurred. This greatly reduces the risk of condensation on the leaves leading to botrytis or to a sudden drop in transpiration leading to plant cell damages. This test shows the positive effects of a highly insulated greenhouse and the chances to regain sensible and latent heat comprised in the ventilation losses of transpiration.
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