Dynamic simulation of the distributed radiative and convective climate within a cropped greenhouse

Nebbali, R.; Roy, J.C.; Boulard, Thierry

doi:10.1016/j.renene.2011.12.003

Cited by 87 publications

(40 citation statements)

References 26 publications

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“…Mistriotis et al (1997) recommended CK and RNG models for their study. Nebbali et al (2012) compared three different models and they proposed standard k-ɛ model as ideal in the results of their study.…”

Section: Solution With Fluentmentioning

confidence: 99%

Evaluation of temperature distribution in different greenhouse models using computational fluid dynamics (CFD)

Cemek¹,

Atiş²,

Küçüktopcu³

2017

Anadolu Journal of Agricultural Sciences

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Areas of air inlet and outlet openings, orientation of openings, height difference between air inlet and outlet openings, wind direction, greenhouse geometry, and type of plant grown are among the many factors that should be taken into consideration in designing an effective ventilation system for greenhouses. In this study, five different model plastic greenhouses with different sidewall heights, air inlet and outlet opening areas and roof shapes were used to evaluate the ventilation efficiencies and they were compared with a conventional type of the region. A computational fluid dynamics (CFD) program was used to evaluate the behavior of the internal environment (internal flow rate and temperature distributions) and natural ventilation rates for all model greenhouses and a conventional greenhouse involved in the study. External wind speeds of 0.5, 1, and 2 ms -1 were used in the simulations for all conditions. The results of simulations and experimental studies were evaluated and used for recommendation of a better greenhouse model for this region. CFD software "FLUENT" was used to determine the effectiveness of greenhouse ventilation system and k-ɛ Renormalization Group (RNG) turbulence model was used in solutions.

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Section: Solution With Fluentmentioning

confidence: 99%

Evaluation of temperature distribution in different greenhouse models using computational fluid dynamics (CFD)

Cemek¹,

Atiş²,

Küçüktopcu³

2017

Anadolu Journal of Agricultural Sciences

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“…Moreover, few studies have addressed the question of the dynamics of solar radiation and temperature distribution as [14] did it for a tunnel greenhouse at a daily time scale. More recently [15] presented numerical simulations of the climatic parameter distribution of a ventilated tunnel greenhouse on the basis of a 3D CFD approach using a bi-band discrete ordinates (DO) model, and calculating the sensible and latent heat transfers between leaves and the surrounding air by including the long wave and shortwave radiation fluxes in each crop control volume taking account of the sun position at each time step.…”

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.

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“…In the greenhouse engineering community, many researchers have employed CFD to study the effects of greenhouse design (Bartzanas, Boulard, & Kittas, 2004;, Bournet, Ould Khaoua, Boulard, Migeon, & Chassériaux, 2007Hong et al, 2008;Kacira, Sase, & Okushima, 2004;Kacira, Short, & Stowell, 1998;Kittas and Bartzanas, 2007;Lee, Short, Sase, Okushima, & Qiu, 2000;Ould Khaoua, Bournet, Migeon, Boulard, & Chassériaux, 2006), specific equipment (Baeza et al, 2009;Fatnassi, Boulard, & Bouirden, 2003;Fatnassi, Boulard, Poncet, & Chave, 2006;Montero et al, 2013;Tamimi, Kacira, Choi, & An, 2013) and external weather conditions (Hong et al, 2008;Nebbali, Roy, & Boulard, 2012; Ould 400 K. He et al Khaoua et al, 2006;Teitel, Ziskind, Liran, Dubovsky, & Letan, 2008;Tong et al, 2009) on greenhouse climates. Their results provide valuable guidance for ventilation system management; however, they are limited to specific greenhouse structures and local climate conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Their results provide valuable guidance for ventilation system management; however, they are limited to specific greenhouse structures and local climate conditions. So far, most numerical studies of natural ventilation have focused on greenhouse climate and ventilation performance during the summer (Baeza et al, 2009;Bartzanas et al, 2004;Fatnassi et al, 2003Fatnassi et al, , 2006Hong et al, 2008;Kacira et al, 1998Kacira et al, , 2004Kichah, Bournet, Migeon, & Boulard, 2012;Nebbali et al, 2012;Ould Khaoua et al, 2006;Teitel et al, 2008). Few have examined the effect of vent opening on greenhouse climates during the different seasons of summer and winter when natural ventilation is respectively used for cooling and dehumidification.…”

Section: Introductionmentioning

confidence: 99%

The effect of vent openings on the microclimate inside multi-span greenhouses during summer and winter seasons

Chen

Sun

et al. 2015

Engineering Applications of Computational Fluid Mechanics

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In research literature, little attention has been applied to the effect of vent openings on greenhouse climates during cooling and dehumidification processes with natural ventilation, which would provide guidelines for greenhouse management. To address this problem, a 3D CFD model was successfully designed based on 11-span plastic greenhouses. The model was validated with the measured air temperature and relative humidity, and then used to investigate the effects of vent configuration and opening size on the greenhouse climate. The simulations show that the vent configuration affects greenhouse microclimate patterns and the spatial and temporal variations of the internal climate. Meanwhile, the vent opening size affects greenhouse dehumidification time, air temperature and relative humidity during the dehumidification process. Finally, the assessments of ventilation performance highlight that the roof plus side opening is most suitable for summer cooling, while the roof opening is most suitable for winter dehumidification.

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Dynamic simulation of the distributed radiative and convective climate within a cropped greenhouse

Cited by 87 publications

References 26 publications

Evaluation of temperature distribution in different greenhouse models using computational fluid dynamics (CFD)

Evaluation of temperature distribution in different greenhouse models using computational fluid dynamics (CFD)

Thermal analysis of greenhouses installed under semi arid climate

The effect of vent openings on the microclimate inside multi-span greenhouses during summer and winter seasons

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