Computational Fluid Dynamics (CFD) research and application in Agricultural and Biological Engineering

Zhang, Guoqiang; Choi, Christopher Y.; Bartzanas, Thomas; Lee, In Bok; Kaçıra, Murat

doi:10.1016/j.compag.2018.04.007

Cited by 13 publications

(7 citation statements)

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“…The total number of grids was maintained at 1.3 × 10 6 . The hexahedral mesh was adopted, and the local meshes were refined to improve the calculation accuracy when meshing the model [ 30 ]. The mesh skewness was below 0.6.…”

Section: Methodsmentioning

confidence: 99%

Effect of external thermal insulation layer on the Chinese solar greenhouse microclimate

et al. 2021

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In order to optimize the heat preservation capacity of Chinese solar greenhouse (CSG) and further reduce energy consumption, we clarified the mechanism of the external thermal insulation layer that affects the microclimate environment of CSG. The most suitable external insulation layer thickness (EILT) of the solar greenhouse envelope structure in high latitude and cold region has been indicated. A three-dimensional mathematical model was developed based on computational fluid dynamics and verified using experimental measurement. The temperature variations, heat variations and economic benefit were analysed. The results indicated that covering the outer surface of the enclosures with a thermal insulation layer could effectively increase the greenhouse temperature by 1.2–4.0°C. The influence degree of the external thermal insulation layer on the greenhouse microclimate was as follows: sidewall (SW) > north wall (NW) > north roof (NR). In high-dimensional and cold areas, covering the outer surface of all enclosures with insulation layer as the suitable solution could raise the greenhouse air temperature maximally. The suitable EILT of each maintenance structure was obtained as follows: NW 80 mm, SW 80 mm, NR 100 mm.

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Section: Methodsmentioning

confidence: 99%

Effect of external thermal insulation layer on the Chinese solar greenhouse microclimate

et al. 2021

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“…Governing equations. CFD technique is a discretized numerical method used to simulate fluid flow and heat transfer in geometric areas [36,37], including three fundamental conservation equations (i.e. mass, momentum and energy equations).…”

Section: Plos Onementioning

confidence: 99%

Effect of internal surface structure of the north wall on Chinese solar greenhouse thermal microclimate based on computational fluid dynamics

Liu

et al. 2020

PLoS ONE

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Chinese solar greenhouses are unique facility agriculture buildings and widely used in northeastern China, providing a favorable requirement for crop growth. The north wall configurations play an essential role in heat storage and thermal insulation and directly affect the management of the internal environment. This research is devoted to further improve the thermal performance of the greenhouse and explore the potential of the north wall. A mathematical model was designed to investigate the concave-convex wall configurations based on computational fluid dynamics. Four passive heat-storage north walls were analyzed by using the same constituent materials, including a plane wall, a vertical wall, a horizontal wall and an alveolate wall. The numerical model was validated by experimental measurements. The temperature distributions of the north walls were examined and a comparative analysis of the heat storage-release capabilities was carried out. The results showed that the heatstorage capacity of the north wall is affected by the surface structure. Moreover, the critical factor influencing the air temperature is the sum of the heat load released by the wall and the energy increment of greenhouse air. The results suggested that the alveolate wall has preferable thermal accumulation capacity. The concave-convex wall configurations have a wider range of heat transfer performance along the thickness direction, while the plane wall has a superior thermal environment. This study provides a basic theoretical reference to rationally design the internal surface structures of the north wall. OPEN ACCESSCitation: Liu X, Li H, Li Y, Yue X, Tian S, Li T (2020) Effect of internal surface structure of the north wall on Chinese solar greenhouse thermal microclimate based on computational fluid dynamics. PLoS ONE 15(4): e0231316. https://doi.

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“…CFD modeling of different parameters in greenhouses has been used to examine various features such as vent configuration [4]; natural and mechanical ventilation [5,6]; ventilation in screenhouses [7]; condensation, transpiration, and heat and mass transfer [8][9][10]; and, more recently, calefaction and HCVA [11] and their interactions [12,13]. The analyses of these systems allow for climate control, thereby offering the possibility to provide large numbers of high-quality crops with greater predictability.…”

Section: Computational Fluid Dynamics (Cfd) In a Greenhouse Simulationmentioning

confidence: 99%

CFD Simulation of Heat and Mass Transfer for Climate Control in Greenhouses

Rodriguez¹,

Velázquez²

2019

Heat and Mass Transfer - Advances in Science and Technology Applications

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Greenhouse plant production involves a number of processes such as transpiration, condensation, photosynthesis, and climate control. Such processes, in turn, set off mass and heat transfer phenomena that influence not only the quality and quantity of crop production but also its environmental cost. While these processes have considerably been analyzed in separate, they strongly interact with one another. For instance, increased radiation (mainly thermal infrared) increases temperature, reduces humidity, consequently increases transpiration, and affects CO 2 exchange as well as other reaction rates. Computational fluid dynamics (CFD) is a numerical tool with a solid physical basis which allows, through the construction of a computational model, to simulate the fluid flow environment. Heating, ventilation, and condensation have been analyzed in the greenhouse environment with CFD techniques. The current challenge is the interaction of these processes and their impact on the production system. The present work summarizes some CFD investigations carried out in this topic, in order to analyze the processes of heat and mass transfer in a greenhouse for agronomic purposes.In greenhouse crop production, climate has peculiar considerations, because the most important data is the impact of the environmental factors on the crop cycle. The cultivation of plants requires a sufficient amount of light, a specific range of temperature, humidity, and CO 2 , among other requirements. These requirements are primarily influenced by the greenhouse design and size and vary according to the local climate conditions. For instance, the radiation quantity inside the greenhouse depends on whether greenhouses are built with PVC or glass, because the surface material is the element to optimally use solar radiation for the required lighting [1].Recently, heating, ventilation, and air conditioning (HVAC) systems have been extensively used in urban spaces, such as offices or stores, at agriculture area, and specifically in greenhouses. For instance, HVAC has been used in buildings in order to analyze the optimization and comfort inner Officine's and several uses. In greenhouses, the concept is incipient, even though the application of the ventilation and calefaction systems as a method to climate control in cold and warm regions is nothing new.The climate produced in a greenhouse is the result of complex mechanisms involving the processes of heat and mass exchange. The internal climate is strongly dependent on the outside conditions, especially in unheated greenhouses. In greenhouse climate models, the parameters of the internal climate such as air, soil, and crop temperatures as well as air humidity are calculated using energy and water vapor balances for the various components of the system [2].Climate in the greenhouse is a consequence of radiation crossing the cover material, usually plastic. After that, climate condition is a strong relationship between several factors, temperature, humidity, wind velocity, and the solar radiation. Environ...

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Computational Fluid Dynamics (CFD) research and application in Agricultural and Biological Engineering

Cited by 13 publications

References 0 publications

Effect of external thermal insulation layer on the Chinese solar greenhouse microclimate

Effect of external thermal insulation layer on the Chinese solar greenhouse microclimate

Effect of internal surface structure of the north wall on Chinese solar greenhouse thermal microclimate based on computational fluid dynamics

CFD Simulation of Heat and Mass Transfer for Climate Control in Greenhouses

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