ISHS Acta Horticulturae 578: International Symposium on Design and Environmental Control of Tropical and Subtropical Greenhouses
TROPICAL AND SUBTROPICAL GREENHOUSES - A CHALLENGE FOR NEW PLASTIC FILMS |
| Authors: | S. Hoffmann, D. Waaijenberg |
| Keywords: | plastic film, greenhouses, near infrared, far infrared, photoselective material, spectral filter, greenhouse climate |
| Abstract:
In subtropical and tropical regions it is necessary to get a cooling effect if high irradiation heats up the greenhouse. It is possible to use covering materials, which contain absorbing, reflecting, interference, photo- or thermochromic pigments. Reflecting and coloured films containing absorbing pigments intercept PAR and give a shading effect throughout the year. More intelligent materials with interference pigments are able to reflect parts of the NIR more selectively. Photo- and thermochromic materials are in principle able to keep out NIR only during periods with high irradiation. For the subtropics there is a need for thermic films, which prevent the transmission of FIR during cold nights and so create an insulating effect. | |
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