Verbetering lichtinval winterlicht : eindrapportage deelproject Schaalmodellen
2015
Swinkels, G.L.A.M. | Kempkes, F.L.K. | Hemming, S.
During winter product prices are usually high in combination with natural light as a limiting growth factor. Therefore it is important to use all the available sunlight for crop production. Important factors which influence light transmission are the structure of the greenhouse (construction elements, orientation, roof slope, symmetrical or asymmetrical design) and the greenhouse roof material (base material, coating(s), diffuse or clear). In the first phase of the project a simulation model is used for analysing a number of promising new concepts. A combination of these concepts will be integrated in a prototype greenhouse which will be built as part of the IDC Energy. In order to validate the simulation model a practical experiment with scale models in the open field is carried out. During the winter the transmission of these scale models is measured. Despite a number of factors which could not be controlled or modelled, such as rain and condensation, in general there was a good match between measurement and calculation. As an overall conclusion, the simulation model shows no consistent differences with the measurements. It is also proved that an asymmetric cover (saw tooth) in combination with diffuse glass does not constitute significantly to the light transmission in comparison with a Venlo cover. This supports the decisions made during the design of the final full scale demo greenhouse.
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