CFD Simulations of the Distributed Climate Time-Evolution inside a Glasshouse at Night

Abstract : Following the rise of energy costs and fuel scarcity, energy becomes today one of the main greenhouse crop production expenses. In this context, growers have to adapt their production system and climate management strategy in order to remain competitive, particularly at night when heat supply is often required and risk of condensation is enhanced. Numerical tools such as Computational Fluid Dynamics (CFD) can help predict the climate inside a greenhouse. CFD however is still scarcely applied in a dynamic way (Nebbali et al., 2011) and under night conditions (Montero et al., 2005). The aim of this study is to implement an unsteady 2D CFD model to predict the time-evolution of greenhouse temperature and humidity distributions all night long in winter, taking account of both radiative transfers and crop interactions with the inside climate. Beyond the classical conservation equations, a radiative submodel and a crop-submodel were activated. The latter takes account of both the heat and transpiration fluxes induced by the plants and their associated mechanical resistances which depend on the transfer mechanisms from the plant to the air. The boundary conditions were modified at each time step. Simulations were performed for a clear night on the basis of data collected in winter 2011 inside a 100 m2 Venlo glasshouse with Impatiens New Guinea crop grown on shelves. Numerical results were validated against data recorded inside the greenhouse: roof temperature, inside air temperature, transpiration flux and air humidity. They highlight the influence of the dynamic boundary conditions on the evolution of the microclimate inside the greenhouse. This study demonstrates the ability of the CFD code to simulate the greenhouse climate evolution with realism. It also suggests a potential exploitation for designing the heating devices in order to optimize the inside climate and energy consumption for various outside conditions.
Type de document :
Communication dans un congrès
Interrnational conference of agricultural engineering, Jul 2012, Valence (ES), Spain
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https://hal-agrocampus-ouest.archives-ouvertes.fr/hal-00918013
Contributeur : Catherine Cliquet <>
Soumis le : jeudi 12 décembre 2013 - 17:45:39
Dernière modification le : vendredi 29 juin 2018 - 11:54:05

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  • HAL Id : hal-00918013, version 1

Citation

B. Morille, R. Genez, Christophe Migeon, Pierre-Emmanuel Bournet, H. Bouhoun Ali. CFD Simulations of the Distributed Climate Time-Evolution inside a Glasshouse at Night. Interrnational conference of agricultural engineering, Jul 2012, Valence (ES), Spain. 〈hal-00918013〉

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