Analysis of the role of sidewall vents on buoyancy-driven natural ventilation in parral-type greenhouses with and without insect screens using computational fluid dynamics

Baeza, E.J.; Pérez-Parra, J.J.; Montero, J.I.; Bailey, B.J.; López, J.C.; Gázquez, J.C.

doi:10.1016/j.biosystemseng.2009.04.008

Cited by 72 publications

(51 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…In order to account for gravity forces due to air density (temperature) changes, the Boussinesq hypothesis was used for the whole of the computational domain (Baeza et al, 2009). This method treats density as a constant value in all the solved equations, except for the gravity term (thermal effect) of the momentum equation:…”

Section: The Cfd Modelmentioning

confidence: 99%

“…CFD has also been used for the design of more efficient ventilation systems. For instance Kacira et al (2004) and Baeza et al (2009) conducted CFD simulations to investigate the effect of side vents in relation to the number of spans. Both studies showed the importance of side ventilation combined with roof ventilation in large greenhouses.…”

Section: Introductionmentioning

confidence: 99%

Shading screens for the improvement of the night time climate of unheated greenhouses

Montero¹,

Muñoz²,

Sánchez-Guerrero

et al. 2013

Span. j. agric. res.

View full text Add to dashboard Cite

The objective of this work was to study the effect of shading screens, normally used during the day for cooling purposes, on the night-time climate of unheated greenhouses. For this purpose, first a number of experimental measurements were taken during cold nights to characterise the greenhouse climate both with and without an aluminised external screen. Secondly a Computational Fluid Dynamic (CFD) model of greenhouse was developed. After validation of the model by comparison with experimental data, the model was used to simulate the greenhouse climate for different sky conditions ranging from cloudless to overcast nights. Simulations were performed for a greenhouse with internal and external shading screens and for the same greenhouse without screens. Experimental results showed the positive effect of an external shading screen, whose use increased night-time temperature and reduced the risk of thermal inversion. Its effect was much stronger under clear sky conditions. The CFD model supported this conclusion and provided a detailed explanation of the temperature behaviour of all the greenhouse types considered. CFD simulations proved that an aluminised screen placed inside the greenhouse at gutter height gave the greatest thermal increase. Therefore, external or internal screens can help to increase the sustainability of greenhouse production in areas with mild winter climates by enhancing the use of solar energy stored in the greenhouse soil during the previous day and released at night-time.

show abstract

“…Natural ventilation concepts have been discussed in many subjects of research, including: (1) relative to a naturally ventilated greenhouse, wind direction significantly affects the flow patterns both inside the greenhouse and at the roof openings, also affecting the ventilation rate and the air and crop temperature distributions (Teitel et al, 2008); (2) excessively high internal temperatures have negative effects on the yield and quality of almost all greenhouse crops because that ventilation is generally insufficient, and the reduced CO 2 levels and the creation of high humidity adversely affects inside air composition, and condensation on the cover also reduces the transmission of solar radiation (Parra et al, 2004); (3) to maximise ventilation when wind speeds are low, buoyancy-driven ventilation and combined roof and sidewall ventilation should be used (Baeza et al, 2009);and (4) there is a unique relationship between water use efficiency and the coupling of the greenhouse environment to the outside air, increasing the capacity of the cooling system could reduce ventilation needs of semi-closed greenhouses and so increase water use efficiency (Katsoulas et al, 2015).…”

Section: Natural Ventilationmentioning

confidence: 99%

Green-energy, water-autonomous greenhouse system: an alternative-technology approach towards sustainable smart-green vertical greening in smart cities

Hung

Peng

2017

IRSPSD International

View full text Add to dashboard Cite

Abstract:By means of "going greener", "getting smarter" and "converging smart-green", an innovation-driven smart city could address the steps toward more sustainability and aim toward improved human well-being. A vertical greening means a vertical triumph of greenery in a high density urban area, in some ways it displays the level of smartness and greenness in a city. Researchers have suggested the use of vertical greening in urban areas to improve sustainability of the environment. However, conventional vertical greening is in open fields, unprotected, threatened by climate disasters, lacking in better controlled climate conditions and plant response-based circumstances. In addition are always the challenges of energy saving, reduction of CO 2 emissions, reduction in water use and in pesticide use. A greenhouse system could instead solve different facets of these problems in conventional vertical greening to achieve an optimal balance between an efficient environmental control and efficient plant use of available resources. The greenhouse solution appears to be intellectually justifiable, adaptable and innovative, and appears beneficial to a smart-green and sustainable smart city. Through the literature review and foresighted design point of view, the paper first summarizes the major concepts and trends of smart cities, vertical greening usage and new greenhouse technologies, and approaches an introduction to the relationship and development between vertical greening and greenhouse systems, and is followed by a presentation of a proposed novel prototype of a green-energy, water-autonomous greenhouse system. The sophisticated and multidisciplinary greenhouse system reveals its innovations and advantages by using water resources and solar energy in a rational way, fit for an alternativetechnology approach towards sustainable smart-green vertical greening in smart cities. Aimed at improving responsiveness, efficiency and performance for environmental and resource sustainability, and also aimed at improving well-being, the system is expected to be a foresight with simplicity in evolutionary vertical greening. By means of Industry Foundation Classes file format, with a true BIM model consisting of a digital prototype of the physical elements, further design of the system will allow us to simulate an ideal greenhouse type of vertical greening and understand its behavior in both the computer environment and actual on-site construction, as well as allow the building of a smart-green point cloud with BIM workflow on any network in a smart city.

show abstract

Analysis of the role of sidewall vents on buoyancy-driven natural ventilation in parral-type greenhouses with and without insect screens using computational fluid dynamics

Cited by 72 publications

References 32 publications

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

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

Shading screens for the improvement of the night time climate of unheated greenhouses

Green-energy, water-autonomous greenhouse system: an alternative-technology approach towards sustainable smart-green vertical greening in smart cities

Contact Info

Product

Resources

About