Effect of the greenhouse design on the thermal behavior and microclimate distribution in greenhouses installed under semi-arid climate
| Autor: | K. H. Meguallati, Pierre-Emmanuel Bournet, K. Mesmoudi |
|---|---|
| Přispěvatelé: | Université Hadj Lakhdar Batna 1, University of Batna Hadj Lakhder [Algeria], Unité de Recherche Environnement Physique de la plante Horticole (EPHOR), Université d'Angers (UA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université d'Angers (UA) |
| Rok vydání: | 2017 |
| Předmět: |
Canopy
020209 energy Microclimate Greenhouse 02 engineering and technology Thermal energy storage Atmospheric sciences 7. Clean energy coupled model [SPI]Engineering Sciences [physics] Thermal 0202 electrical engineering electronic engineering information engineering greenhouse design Fluid Flow and Transfer Processes Natural ventilation 04 agricultural and veterinary sciences Condensed Matter Physics radiation 13. Climate action Photosynthetically active radiation Semi-arid climate CFD simulation 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science microclimate thermal analysis |
| Zdroj: | Heat Transfer—Asian Research Heat Transfer—Asian Research, 2017, 35 (3), pp.n/a-n/a. ⟨10.1002/htj.21274⟩ |
| ISSN: | 1099-2871 |
| DOI: | 10.1002/htj.21274 |
| Popis: | International audience; Greenhouse design and cover material properties may strongly impact greenhouse energy. To study the effect of these parameters, three typical unheated agricultural buildings equipped with rows of canopy were considered, and two-dimensional simulations were conducted using the discrete ordinate model for simulating radiative transfers. Experiments were conducted to establish the boundary conditions and to validate the model. Two parametric studies were carried out: one for the nocturnal period when the energy performance of each type of greenhouse was investigated, and one for the diurnal period, when the sun path was simulated taking into account the type of the cover, its spectral optical and thermal properties. Results indicate that for the diurnal period, and for both plastic greenhouses equipped with fully opened side vents, the air located between the rows of canopy and ground surfaces remained very slow, not exceeding 0.2 m/s; for the Venlo glasshouse, the recirculation loop situated above the crop improved the air mixing and induced a good homogenization. Results also indicate that the cover material with the highest absorptivity, deteriorated the natural ventilation, increasing the air temperature by convection, enhancing local air temperature favoring the development of a secondary recirculation, and reduced the available photosynthetically active radiation. Concerning the nocturnal period, the ambient air temperature in the tunnel and in the vertical wall of the greenhouse was relatively homogenous and warmer than the temperature in the Venlo greenhouse. During the nocturnal period, the plastic greenhouse (in particular the one with the tunnel) performed better in regard to the homogenization of the climate and thermal energy storage. |
| Databáze: | OpenAIRE |
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