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ÉLABORATION D'UN MODÈLE DU CLIMAT DISTRIBUÉ À L'ÉCHELLE DE L'ABRI ET DE LA PLANTE EN CULTURES ORNEMENTALES SOUS SERRES : ANALYSE DES TRANSFERTS DE MASSE ET DE CHALEUR, BILANS ÉNERGÉTIQUES

Abstract : The objectives of this thesis are to develop a numerical tool which would be able to provide exhaustive information on the evolution of the distributed climate in a greenhouse. The thesis is based on experimental and numerical approaches and aims for giving information on the main concerns of the growers: the temperature and the humidity management with a special attention giving to the reduction of the energy consumptions. This is the reason why the study considers two situations in which these main concerns are the most pronounced. Experimental investigations on the climatic parameters have been led at the end of spring 2010 and at winter 2011 in order to increase the comprehension of the interaction between the physical mechanisms governing the climate and to provide data carry on the numerical part of this study. The higher heating needs and lower roof wall temperature during clear nights were evidence as well as most important role played by the solar radiation during days especially on temperature, the crop transpiration and the phenomenon of storage and restitution of heat in the ground. Then, the sensible ventilation efficiency impact on humidity and the lower on temperature are evidenced. Last, experimental data were also exploited through the application of transpiration models adapted to greenhouse conditions. Water balance on a crop divided into two layers provides supply information on the transpiration distribution. The unsteady 2D simulations consider night (clear, cloudy) and daytime (under clear sky conditions) situations. Innovative improvements are implemented into existing models : the RTE is solved in the canopy volume and provide the exact absorbed radiation in each crop layer all along the day and a condensation sub-routine is activated to simulate humidity rate evolution during the night. Models are validated against a large number of experimental climatic parameters. Simulations show good agreements with experimental data even if slight underestimations of humidity and temperature differences between above and inside crop air evidence the need of improvements on this point. Last, water and energy balances are obtained thanks to these models.
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https://tel.archives-ouvertes.fr/tel-00958617
Contributor : Benjamin Morille <>
Submitted on : Thursday, March 13, 2014 - 4:41:09 AM
Last modification on : Monday, July 6, 2020 - 3:38:28 PM
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  • HAL Id : tel-00958617, version 1

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B. Morille. ÉLABORATION D'UN MODÈLE DU CLIMAT DISTRIBUÉ À L'ÉCHELLE DE L'ABRI ET DE LA PLANTE EN CULTURES ORNEMENTALES SOUS SERRES : ANALYSE DES TRANSFERTS DE MASSE ET DE CHALEUR, BILANS ÉNERGÉTIQUES. Sciences de l'environnement. Agrocampus - Centre d'Angers, 2012. Français. ⟨tel-00958617⟩

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