ISHS Acta Horticulturae 456: II Modelling Plant Growth, Environmental Control and Farm Management in Protected Cultivation
MODELLING OF TRANSPORT PHENOMENA NEAR GREENHOUSE SCREENS |
| Authors: | A.F. Miguel, A.M. Silva, N.J. van de Braak, G.P.A. Bot |
| Keywords: | screens, greenhouse, airflow, free convective heat transfer |
| Abstract:
Experiments were conducted with the aim to examine the airflow characteristics (permeability and porosity) of some currently employed greenhouse screens, and to obtain equation coefficients for estimation of free convection heat transfer between heating pipes and the air, and horizontal screen and the air. Experiments demonstrated that thermal and shading screens have permeabilities of approximately 10-11m2 and their porosities are less than 10%. Free convective heat transfer coefficient ( | |
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) for the upper and lower screen surface is given, respectively by 
