3-D CFD analysis of relative humidity distribution in greenhouse with a fog cooling system and refrigerative dehumidifiers

Kim, Keesung; Yoon, Jeong Yeol; Kwon, Hyuck Jin; Han, Jin Hee; Son, Jung Eek; Nam, Sang Woon; Giacomelli, G. A.; Lee, In Bok

doi:10.1016/j.biosystemseng.2008.03.006

Cited by 105 publications

(54 citation statements)

References 10 publications

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“…However, in those studies, radiation was not simulated directly through a radiative transfer equation but its effect was indirectly incorporated either through specific boundary conditions or through the addition of an extra source term in the energy transport equation. More recently, Kim [13] included the short wave length radiation in their simulations (diurnal conditions) while Bournet [6] implemented a bi-band radiation model distinguishing short and long wave length contributions to take account of the diverse optical properties of the glass within these different bands. 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.…”

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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Section: Introductionmentioning

confidence: 99%

Thermal analysis of greenhouses installed under semi arid climate

Mesmoudi¹,

Meguellati²,

Bournet³

2017

IJHT

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“…Campen (2008) showed that climate through a ventilation system is more homogeneous and the control is more efficient than with the conventional method of steam extraction. Dehumidifiers and cooling reduce the overall difference in humidity between the middle and lower areas of a greenhouse, as demonstrated by Kim (2008) using a 3D model could identify the heterogeneous distribution of relative humidity in a greenhouse. According to Majdobi et al (2009), an increase in air temperature precedes a more moderate increase in specific humidity.…”

Section: Incorporation Crop Effects and Crop Modelingmentioning

confidence: 97%

Advances in Computational Fluid Dynamics Applied to the Greenhouse Environment

Flores-Velázquez¹,

Torre-Gea²,

Rico-García³

et al. 2012

Applied Computational Fluid Dynamics

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“…A number of papers have been produced taken into account these aspects (Fatnassi et al, 2003;Molina-Aiz et al, 2004;Rouboa and Monteiro, 2007;Kim et al, 2008;Franco et al, 2011). A recent review on other aspects of crop production and greenhouses can be found in Bartzanas et al (2013).…”

Section: Computational Fluid Dynamics In Buildings and Infrastructurementioning

confidence: 99%

Present and future of the numerical methods in buildings and infrastructures areas of biosystems engineering

Ayuga

2015

J Agricult Engineer

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Biosystem engineering is a discipline resulting from the evolution of the traditional agricultural engineering to include new engineering challenges related with biological systems, from the cell to the environment. Modern buildings and infrastructures are needed to satisfy crop and animal production demands. In this paper a review on the status of numerical methods applied to solve engineering problems in the field of buildings and infrastructures in biosystem engineering is presented. The history and basic background of the finite element method is presented. This is the first numerical method implemented and also the more developed one. The history and background of other two more recent methods, with practical applications, the computer fluids dynamics and the discrete element method are also presented. Besides, a review on the scientific and professional applications on the field of buildings and infrastructures for biosystem engineering needs is presented. Today we can simulate engineering problems with solids, engineering problems with fluids and engineering problems with particles and get to practical solutions faster and cheaper than in the past. The paper encourages young engineers and researchers to make progress these tools and their engineering applications. The capacities of all numerical methods in their present development status go beyond the present practical applications. There is a broad field to work on it. IntroductionThe present paper is a review of the numerical methods at present and their applications in solving engineering problems. The field is too wide to be considered in a single article. This is why the paper focuses on presenting the fundamentals of the most significant numerical methods that can be applied for buildings and infrastructures areas of biosystems engineering. The three next numerical methods will be considered: i) finite element method (FEM); ii) computer fluid dynamics (CFD); iii) discrete element method (DEM).In the paper the main features of these methods will be presented along with showing some examples in areas of biosystems engineering. Modern engineering can be considered to begin with the industrial revolution in the late eighteenth and early nineteenth century. From the very beginning, it has used the most powerful mathematical tools of the time in order to solve problems arising in practice. It was considered a fact that it was essential acquiring solid mathematical foundations for being a good engineer. The programs of studies from all Universities of the time prove it so. Even great figures on mathematics of the nineteenth and twentieth centuries were formally engineers. This symbiosis has produced good results for society. In the second half of XX Century, the fast development of computer science produced a great advance in numerical methods applied to physics and engineering.Based on this premise, the predictable future is that calculation and structural analysis in all fields of engineering will be based on modern numerical methods. This power...

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3-D CFD analysis of relative humidity distribution in greenhouse with a fog cooling system and refrigerative dehumidifiers

Cited by 105 publications

References 10 publications

Thermal analysis of greenhouses installed under semi arid climate

Thermal analysis of greenhouses installed under semi arid climate

Advances in Computational Fluid Dynamics Applied to the Greenhouse Environment

Present and future of the numerical methods in buildings and infrastructures areas of biosystems engineering

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