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 423749
Title Calculation of NIR effect on greenhouse climate in various conditions
Author(s) Kempkes, F.L.K.; Hemming, S.
Source In: ISHS 28th Int. Horticultural Congress - Science and Horticulture for People (IHC 2010): International Symposium on Greenhouse 2010 and Soilless Cultivation. - Lisbon, Portugal : ISHS - ISBN 9789066057241 - p. 543 - 550.
Event Lisbon, Portugal : ISHS - ISBN 9789066057241 28th International Horticultural Congress, 2010-08-22/2010-08-27
Department(s) WUR GTB Tuinbouw Technologie
Publication type Contribution in proceedings
Publication year 2012
Abstract In Northern regions of Europe glass is mainly used as greenhouse covering material whereas in Southern regions plastic films are commonly used. The develop-ment of covering material optical properties focuses on high light transmission, reduction of heating energy losses (higher latitudes) and reduction of cooling energy load by radiation (lower latitudes). Solar radiation can be divided into photosynthetic active radiation PAR and near infrared radiation NIR. Whereas the PAR is needed for crop growth and development, the energy fraction of the NIR heats the greenhouse and crop and contributes to transpiration, which is not necessarily always desirable during periods with high radiation. Materials or additives for greenhouse covers that reflect or absorb a fraction of the NIR radiation have become available on the market. Excluding NIR from the greenhouse will reduce the greenhouse air temperature. However, there are several side-effects of the reduction of NIR, which are important to consider, such as a higher energy use in winter and a smaller impact on reduction of heat load as expected because of the high NIR reflection of the crop itself. In this study model calculations of the effect on greenhouse climate of different NIR-absorbing prototype plastic films for the climatic conditions of Southern Spain are presented. The effect on greenhouse air temperature and humidity, and on crop transpiration are analyzed. The most appropriate application of a NIR-selective greenhouse cover for that climate is presented.
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