Effect of crops on natural ventilation in a screenhouse evaluated by CFD simulations

Flores, Jorge; Ojeda-Bustamante, Waldo; Villarreal‐Guerrero, Federico; Rojano, A.

doi:10.17660/actahortic.2017.1170.10

Cited by 9 publications

(10 citation statements)

References 24 publications

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“…Also qualitatively a pattern of air movement can be observed inside the SH where the air flows that move near the front walls of the structure, which are parallel to the flow of external air are presented vectors of greater speed, this is because in this type of structure where the cover is a porous material promotes the exchange of air between the external and internal environment near these regions, therefore they are areas that have a higher degree of ventilation (Flores-Velazquez et al, 2017;Teitel et al, 2015).…”

Section: Cfd Model Calibrationmentioning

confidence: 95%

“…The study of the microclimatic behavior of SH is not as generalized as that of conventional greenhouses, but probably has contributed empirically to the implementation of SH despite the lack of research on aspects such as architecture, the geometry of the structure and the type of mesh used (Flores-Velazquez et al, 2017). The existing studies on the microclimate in the SH have been addressed mainly through experimental approaches and through numerical computational fluid simulation (CFD) as can be reviewed in Mahmood et al (2018), and in studies analyzing thermal and aerodynamic behavior (Tanny et al, 2008;Teitel et al, 2014Teitel et al, , 2017, as well as the effect of the screen pore size (Kalcsits et al, 2017;Tanny et al, 2018), and the shape and geometry of the structure (Flores-Velazquez et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Microclimatic behavior of a screen house proposed for horticultural production in low-altitude tropical climate conditions

Villagrán

Noreña

2020

Com. Sci.

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In developing countries, horticultural production in low-altitude tropical climate conditions is often limited by biotic and abiotic factors. In these countries, the implementation of highly technical greenhouses is not feasible due to economic, social and cultural issues related to farmers. Therefore, one of the alternatives that has taken a great boom is the use of screen house structures (SH), although information on the microclimatic behavior of these is still limited. The objective of this research was to use an experimentally validated 3D CFD numerical simulation model to study the thermal behavior and airflow patterns in an SH located in the Colombian Caribbean region during the daytime hours (6:00 to18:00 h). The results obtained showed that the air flow patterns inside the SH showed speed reductions of up to 68% with respect to the speed of the external wind. It was also found that the thermal behavior inside the SH was quite homogeneous, the average temperature values in the structures ranged between 23.9 and 39 °C and the difference with external environment temperature did not exceed 1.8 °C. It was concluded that the implementation of this type of structure could be an useful technological tool for the optimization of horticultural production in low-altitude tropical climate regions.

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Section: Cfd Model Calibrationmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Microclimatic behavior of a screen house proposed for horticultural production in low-altitude tropical climate conditions

Villagrán

Noreña

2020

Com. Sci.

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“…The use of insect-proof screenhouses structures (S-MH) for horticultural and fruit production is becoming more and more widespread worldwide and cultivation areas under this production approach are steadily increasing year by year [1]. This type of structure is an intermediate technology between open field production and greenhouse production, in tropical countries with warm and moist climate conditions its implementation is an alternative of sustainable intensification for agricultural production [2][3][4]. The S-MH is generally a simpler and lower cost structure than the greenhouse, it is built on metal or wooden columns supporting a cover made of steel cables.…”

Section: Introductionmentioning

confidence: 99%

“…The architecture and geometric configuration of the S-MH are also parameters influencing the airflow patterns and, therefore, the microclimate generated inside these structures [3]. However, in many regions the establishment of S-HM is based on the empirical criteria of the producers or builders.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Numerical Study of the Microclimate Generated in Three Screenhouses for the Climatic Conditions of the Colombian Caribbean

Villagrán¹

2021

IJHT

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Insect proof screenhouse is increasingly used in tropical countries with a warm climate, as this type of structure is more economical than greenhouses and gives farmers the opportunity to optimize their production systems. In this work we used an experimentally validated two-dimensional numerical model, the objective was to study the air flow patterns and the thermal and hygrometric behavior of three screenhouses differentiated in their geometric configuration of the roof area and under four (4) outside wind speeds. The results obtained allowed us to find that the airflow speed inside the screenhouse can be maximized with respect to the most critical scenario by 29% for a wind speed of 0.5 ms-1 and up to 292% for a wind speed of 3.0 ms-1, which generates reductions in the average temperature inside the structure of -0.2℃ (0.5 ms-1) and up to -2.2℃ (3 ms-1). While the relative humidity presented values of 1.6% and 6.3% higher for these same speeds.

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“…Bartzanas et al [1] developed a two-dimensional CFD study to assess the effect of a screen on radiation distribution, finding that the optical and spectral properties directly affect the distribution of solar radiation, and the degree of porosity of the screen reduces air velocity, affecting the thermal behavior inside the screenhouse. Other relevant studies using 3D CFD modeling were in charge of evaluating the behavior of air flows and the value of temperature in screenhouses used for tomato cultivation, reporting that these parameters are strongly affected by the degree of porosity of the screen [24]. Although these works have not been developed for the warm climate conditions of the Central American Caribbean According to the above, the objective of this work was to determine through 3D CFD simulation the thermal and airflow patterns behavior of an insect proof screen house established in Guanacaste -Costa Rica.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Thermal and Aerodynamic Behavior of an Established Screenhouse under Warm Tropical Climate Conditions: A Numerical Approach

Villagrán¹,

Ramírez²,

Rodriguez³

et al. 2020

IJSDP

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In tropical countries agriculture protected with passive and low-cost structures is one of the main alternatives for intensifying agricultural production in a sustainable manner. This type of greenhouses has adequate efficiency in cold weather conditions meanwhile its use in hot weather conditions presents disadvantages due to the generation of an inadequate microclimate for the growth and development of certain species. This has generated an important interest for the use of screen houses (SH) for the horticultural and fruit production, and currently there are many studies on the behavior of microclimates in SH; however, these experiments were developed for climatic conditions in other latitudes. In this research, a study was developed using a computational fluid dynamics (CFD) 3D numerical simulation, with the aim of evaluating the thermal and aerodynamic behavior of an SH under two specific configurations (under rain (RC) and under dry conditions (DC)). The CFD model was validated by taking experimental temperature data inside the SH. The results showed that: i) the CFD model has an acceptable capacity to predict the behavior of temperature and air flows, ii) simulations can be performed under environmental conditions of day and night, and iii) the RC configuration affected the positive thermal behavior, which limited the presence of the thermal inversion phenomenon under nocturnal conditions, meanwhile under RC daytime conditions, it reduced the velocity of the air flows generating higher thermal gradients compared to DC.

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Effect of crops on natural ventilation in a screenhouse evaluated by CFD simulations

Cited by 9 publications

References 24 publications

Microclimatic behavior of a screen house proposed for horticultural production in low-altitude tropical climate conditions

Microclimatic behavior of a screen house proposed for horticultural production in low-altitude tropical climate conditions

Two-Dimensional Numerical Study of the Microclimate Generated in Three Screenhouses for the Climatic Conditions of the Colombian Caribbean

Simulation of the Thermal and Aerodynamic Behavior of an Established Screenhouse under Warm Tropical Climate Conditions: A Numerical Approach

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