Effect of Crop Row Orientation on the Passive Ventilation of a Plastic Greenhouse

Hernandez, J.; Fernandez-Tapia, J.M.; Hita, Oscar; Soriano, T.; Morales, M.I.; Castilla, N.; Escobar, I.

doi:10.17660/actahortic.2006.719.21

Cited by 2 publications

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“…The effect on the crop is particularly important for greenhouses, as side openings may be partly obstructed by the crop rows. Hernandez et al . studied the effects of crop row orientation (perpendicular or parallel to the wall equipped with side openings) on the ventilation and microclimate of a plastic multispan greenhouse.…”

Section: Introductionmentioning

confidence: 99%

“…The analysis of the humidity issues in greenhouse climate using the CFD tools at different scales-the leaf, the canopy and the greenhouse itself-was also conducted by Bournet et al 7 The effect on the crop is particularly important for greenhouses, as side openings may be partly obstructed by the crop rows. Hernandez et al 8 studied the effects of crop row orientation (perpendicular or parallel to the wall equipped with side openings) on the ventilation and microclimate of a plastic multispan greenhouse. More recently, based on a computational fluid dynamics (CFD) model and an experimental approach, Majdoubi 9 analyzed the effect of crop row orientation on internal climate in a large type greenhouse and found the ventilation rate to be heavily dependent on the orientation of the crop rows with respect to the dominant wind direction.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the greenhouse design on the thermal behavior and microclimate distribution in greenhouses installed under semi‐arid climate

Mesmoudi

Meguallati

Bournet

2017

Heat Trans. Asian Res.

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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.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the greenhouse design on the thermal behavior and microclimate distribution in greenhouses installed under semi‐arid climate

Mesmoudi

Meguallati

Bournet

2017

Heat Trans. Asian Res.

View full text Add to dashboard Cite

show abstract

“…The effect of the crop is particularly important for greenhouses, as side openings may be partly obstructed by the crop rows. Hernandez [8] studied the effects of crop row orientation (perpendicular or parallel to the wall equipped with side openings) on the ventilation and microclimate of a plastic multi span greenhouse. More recently, based on a computational fluid dynamics (CFD) model and an experimental approach, Majdoubi [9] analyzed the effect of crop row orientation on internal climate in a large type greenhouse, and found the ventilation rate to be heavily dependent on the orientation of the crop rows with respect to the dominant wind direction.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of greenhouses installed under semi arid climate

Mesmoudi¹,

Meguellati²,

Bournet³

2017

IJHT

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The greenhouse design as well as the cover material properties in particular may strongly impact the greenhouse energy. To study the effect of these parameters, three typical unheated greenhouses equipped with rows of canopy were considered. Experiments were launched to establish the boundary conditions and validate the model. Two parametric studies were carried out: for the nocturnal period when the energy performance of each type of greenhouse was investigated, and 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 nocturnal period, the ambient air temperature in the tunnel and vertical wall greenhouse was relatively homogenous and warmer compared with the temperature distribution in the Venlo greenhouse. The plastic greenhouse, especially the tunnel one had better performances concerning the homogenization of the climate and the thermal energy storage. Concerning 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 ms -1 ; for the Venlo glasshouse, the recirculation loop situated above the crop improved the air mixing and induced a good homogenization. Results indicate that the cover material with highest absorptivity, deteriorated the natural ventilation, increasing the air temperature by convection, and reduced the available Photosynthetically Active Radiation.

show abstract

Effect of Crop Row Orientation on the Passive Ventilation of a Plastic Greenhouse

Cited by 2 publications

References 0 publications

Effect of the greenhouse design on the thermal behavior and microclimate distribution in greenhouses installed under semi‐arid climate

Effect of the greenhouse design on the thermal behavior and microclimate distribution in greenhouses installed under semi‐arid climate

Thermal analysis of greenhouses installed under semi arid climate

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