Co2 Distribution Under Co2 Enrichment Using Cfd Considering Photosynthesis Model in a Tomato Greenhouse

Nurmalisa, Moliya; Tokairin, Takayuki; Kumazaki, Tadashi; Takayama, Kotaro; Inoue, Takanobu

doi:10.2139/ssrn.4051645

SSRN Journal

2022

DOI: 10.2139/ssrn.4051645

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Co2 Distribution Under Co2 Enrichment Using Cfd Considering Photosynthesis Model in a Tomato Greenhouse

Moliya Nurmalisa¹,

Takayuki Tokairin²,

Tadashi Kumazaki³

et al.

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2024

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Cited by 2 publications

References 28 publications

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Design and Optimization of Air Inlet in Cuttings Incubator

Gu,

Qian,

et al. 2024

Agronomy

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The microclimate environment can be conveniently controlled with accuracy by plant incubators, in which the cuttings propagation method can efficiently enhance seedling production. To ensure air flow evenly throughout the incubator, the scientific design of the air inlet is crucial. This study utilized a computational fluid dynamics (CFD) model to simulate the airflow patterns in a culture layer under different air inlet conditions. Furthermore, the optimal design parameters were determined by way of response surface methodology (RSM) and the Non-dominated Sorting Genetic Algorithm-II (NSGA-II). Adopting the optimal parameters, a prototype was manufactured, and a cuttings experiment was carried out with apple cuttings in the incubator. The results showed that the optimal air inlet radius is 90 mm, the optimal air inlet height is 188 mm, and the optimal uniform flow plate hole diameter is 13 mm. Meanwhile, the apple cuttings were able to root. Therefore, this incubator with optimal parameters can be used for cuttings. The study provides a methodological and theoretical basis for the future optimizing of air inlet parameters and promoting cuttings rooting.

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Design and Optimization of Air Inlet in Cuttings Incubator

Gu,

Qian,

et al. 2024

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Study on the Natural Ventilation Model of a Single-Span Plastic Greenhouse in a High-Altitude Area

Li,

Zhao,

Dai

et al. 2024

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The natural ventilation model plays a crucial role in greenhouse environmental control. It has been extensively studied by previous researchers, but it is limited to low-altitude areas. This study established a numerical model of single-span plastic greenhouses in high-altitude areas. The model was validated using measured data, showing a good agreement between the measured and simulated values. By setting boundary conditions based on on-site monitoring data, ventilation rates were extracted under different conditions for numerical simulations. Through nonlinear fitting, an empirical formula for natural ventilation rates, with a determination coefficient (R2) of 0.9724, was derived. The formula was validated through an energy balance analysis of indoor air. Different ventilation opening sizes were simulated to derive an empirical formula for natural ventilation rates based on opening size. Building on this, the relationship between plant height and ventilation rate was analyzed. As the dominant factors of natural ventilation change with environmental fluctuations, this study also proposed the threshold wind speed for wind pressure ventilation, thermal pressure ventilation, and coupled ventilation, filling the knowledge gap in relevant ventilation rate calculations. This is the first time that a natural ventilation model of single-span plastic greenhouses in high-altitude areas has been proposed, providing the basis in terms of modeling for the further development of local facility agriculture.

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Co2 Distribution Under Co2 Enrichment Using Cfd Considering Photosynthesis Model in a Tomato Greenhouse

Cited by 2 publications

References 28 publications

Design and Optimization of Air Inlet in Cuttings Incubator

Design and Optimization of Air Inlet in Cuttings Incubator

Study on the Natural Ventilation Model of a Single-Span Plastic Greenhouse in a High-Altitude Area

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