Aerodynamic analysis and CFD simulation of several cellulose evaporative cooling pads used in Mediterranean greenhouses

Franco, Antônio; Valera, D.L.; Peña, Araceli; Pérez, Antonio Solanas

doi:10.1016/j.compag.2011.01.019

Cited by 71 publications

(43 citation statements)

References 44 publications

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“…The packing material in the cooling chamber is the key element in the heat and mass transfer process, as it fulfills two important functions: it provides a large contact surface for the mixing of the water and air flows, while at the same time ensuring that the transfer process takes as little time as possible [9]. As a result, the amount of water evaporated increases and the temperature of the non-saturated air decreases.…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency in Greenhouse Evaporative Cooling Techniques: Cooling Boxes versus Cellulose Pads

2014

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Abstract:Evaporative cooling systems using a combination of evaporative pads and extractor fans require greenhouses to be hermetic. The greatest concentration of greenhouses in the world is located in southeast Spain, but these tend not to be hermetic structures and consequently can only rely on fogging systems as evaporative cooling techniques. Evaporative cooling boxes provide an alternative to such systems. Using a low-speed wind tunnel, the present work has compared the performance of this system with four pads of differing geometry and thickness manufactured by two different companies. The results obtained show that the plastic packing in the cooling unit produces a pressure drop of 11.05 Pa at 2 m·s, which is between 51.27% and 94.87% lower than that produced by the cellulose pads. This pressure drop was not influenced by increases in the water flow. The evaporative cooling boxes presented greater saturation efficiency at the same flow, namely 82.63%, as opposed to an average figure of 65% for the cellulose pads; and also had a lower specific consumption of water, at around 3.05 L·h . Consequently, we conclude that evaporative cooling boxes are a good option for cooling non-hermetic greenhouses such as those most frequently used in the Mediterranean basin.

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Section: Introductionmentioning

confidence: 99%

Energy Efficiency in Greenhouse Evaporative Cooling Techniques: Cooling Boxes versus Cellulose Pads

2014

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“…Its code uses a discretization procedure of finite volumes and it incorporates the equations that govern heat flow and transfer, such as the continuity equation, momentum conservation and energy conservation. The overall methodology used to carry out a complete study with the commercial software used in this work is summarized as follows: generating the geometry of the fluid domain, meshing, defining the boundary conditions and the physical properties of the model (pre-processing), solving and finally analysis (post-processing) [8]. The classical mass, momentum, energy and concentration equations can be represented for a steady-state, three-dimensional flow with the following conservation equation.…”

Section: Cfd Numerical Simulation Methodsmentioning

confidence: 99%

Research on Effect of Ventilated Region to Grape Rain Shed Performance Based on CFD

Wang

Yang

2012

Computer and Computing Technologies in Agriculture V

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Abstract. Two different kinds of multi-span grape rain sheds are constructed and the wind field and rainfall field distribution are simulated based on CFD and computer simulation techniques. The airflow distribution, temperature variation, wind pressure distribution and rainfall vectors distribution are compared under two conditions with ventilated region and without ventilated area in multi-span grape rain shed. The research results show that set the ventilated area on the top of grape rain shed can improve effectively the high temperature and high humidity climate environment, and it has a benefit to grapes fertility.

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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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Aerodynamic analysis and CFD simulation of several cellulose evaporative cooling pads used in Mediterranean greenhouses

Cited by 71 publications

References 44 publications

Energy Efficiency in Greenhouse Evaporative Cooling Techniques: Cooling Boxes versus Cellulose Pads

Energy Efficiency in Greenhouse Evaporative Cooling Techniques: Cooling Boxes versus Cellulose Pads

Research on Effect of Ventilated Region to Grape Rain Shed Performance Based on CFD

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

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