منابع مشابه
On-line Estimation of the Ventilation Rate of Greenhouses
Using an unknown input observer, with an output linearising feedback, an online estimator for the ventilation flow or rate is developed for natural ventilated greenhouses. The paper shows how to design, implement and tune such an estimator in practice and shows that it performs well. Furthermore the practical value for the grower is discussed. Copyright © 2005 IFAC
متن کاملSonic Anemometry to Measure Natural Ventilation in Greenhouses
The present work has developed a methodology for studying natural ventilation in Mediterranean greenhouses by means of sonic anemometry. In addition, specific calculation programmes have been designed to enable processing and analysis of the data recorded during the experiments. Sonic anemometry allows us to study the direction of the airflow at all the greenhouse vents. Knowing through which v...
متن کاملWeb-based estimation model of natural ventilation efficiency in greenhouses using 3D computational fluid dynamics
In this work a model to estimate the efficiency of natural ventilation in a commercial twin-span greenhouse is presented. A numerical simulation approach was adopted using the theory of three-dimensional computational fluid dynamics (CFD). With this approach, it was able to generate three-dimensional patterns for temperature and airspeed inside the greenhouse, using specific boundary conditions...
متن کاملREVIEW PAPER: Convective and Ventilation Transfers in Greenhouses, Part 2: Determination of the Distributed Greenhouse Climate
T. Boulard; C. Kittas; J.C. Roy; S. Wang 1 INRA, Unit! e Plantes et Syst" emes de Culture Horticoles, Domaine St Paul, Site Agroparc, 84914 Avignon Cedex 09, France; e-mail of corresponding author: [email protected] School of Agriculture, University of Thessaly, Phytokou Street, 38446 N. Ionia Magnisias, Greece; e-mail:[email protected] CRESTUMR CNRS 6000, Universit! e de Franche-Comt! e, 2,...
متن کاملEvolving Greenhouses
To explore the space between the theories of the Diffusion of Innovations and Universal Darwinism, we first examine a case study of the history of the greenhouse horticulture sector of the Netherlands, comparing and contrasting the narrow focus of Diffusion of Innovations and the wider focus of Universal Darwinism. We then build an agent-based model using elements of both in order to test how w...
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ژورنال
عنوان ژورنال: Journal of Agricultural Meteorology
سال: 1980
ISSN: 0021-8588,1881-0136
DOI: 10.2480/agrmet.36.3