Wind pressure acting on greenhouses: A review

Nan, Bo; Wang, Tieliang; Bai, Yanchao; Li, Yuqing

doi:10.25165/j.ijabe.20211402.5261

Cited by 14 publications

(18 citation statements)

References 55 publications

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“…Sakiyama et al [13] provided an overview of natural ventilation investigations with respect to thermal comfort, the efficiency of energy usage, and indoor air quality. Wang et al [14] summarized the wind pressure coefficients on the surface of different greenhouse types. Zhong et al [15] discussed papers relevant to single-sided natural ventilation.…”

Section: (G1))mentioning

confidence: 99%

“…Typical Chinese solar greenhouses (CSG) have horizontal roof openings. However, the measured wind pressure coefficients of CSG were only used to evaluate the wind load of the greenhouses [14] and to deduce the critical wind speed for wind disasters in various areas of the facility [62][63][64]. The wind pressure coefficient of CSG is often calculated using a scale model with the vents completely closed in the wind tunnel.…”

Section: Displacement Ventilationmentioning

confidence: 99%

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Greenhouse Natural Ventilation Models: How Do We Develop with Chinese Greenhouses?

et al. 2022

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Greenhouse technology has advanced over the past few decades in terms of environmental control (e.g., indoor temperature, relative humidity, and CO2 concentration). Ventilation is an effective way to adjust the indoor climate. Natural ventilation has gained significant research attention recently because of its low energy requirement. To evaluate the ventilation effectiveness, the ventilation rate is often used. This review summarizes the published review papers related to greenhouse ventilation. Ventilation models are reported under different conditions, including wind-induced, buoyancy-induced, and combined effects-induced ventilation in greenhouses. The influencing factors are described, such as the wind and buoyancy strength and distribution, greenhouse geometry, and vent arrangement. Various methods assessing natural ventilation in greenhouses are introduced, consisting of tracer gas techniques, the pressure difference method, the energy balance method, the emptying fluid-filling box method, and numerical simulation. The values of the key coefficients deduced and used in the literature are listed. This paper reports what has been done in the world and where we can start to develop dynamic ventilation models for solar and tunnel-type greenhouses in China. Further valuable investigations are discussed. The pressure distribution function in greenhouses with horizontal openings, a model for cross-ventilation induced by combined wind and buoyancy force, and an analytical plant-considered ventilation model with higher applicability are described. To ensure the accuracy of the ventilation models, other environmental variables, especially geography-dependent ones, can be added. More criteria are suggested to evaluate the ventilation performance rather than the ventilation rate to provide a comprehensive assessment.

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Section: (G1))mentioning

confidence: 99%

Section: Displacement Ventilationmentioning

confidence: 99%

Greenhouse Natural Ventilation Models: How Do We Develop with Chinese Greenhouses?

et al. 2022

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“…At present, the main greenhouse design method is the quasi-static design method, which uses the equivalent static wind load and snow load. Many studies have used this method to simulate and evaluate the wind and snow resistance performance of different types of greenhouses and found that this method has high accuracy in low-rise buildings and simple greenhouse structures [5] .…”

Section: Introductionmentioning

confidence: 99%

New Wind and Pressure-resistant Structural Design and Static Simulation Analysis of Continuous Greenhouse

Chen,

Wang,

Tang

et al. 2023

J. Phys.: Conf. Ser.

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To improve the wind and snow resistance of the continuous round-arch greenhouse skeleton structures, a new wind and pressure-resistant continuous greenhouse with arch spars and diagonal ties is designed in this study. By increasing the number of secondary arches, arch spars, and diagonal ties, and optimizing the traditional spars, this skeleton structure not only improves the snow pressure resistance of arch bars but also enhances the resistance to wind loads. Taking wind load and snow load in the Hangzhou area of Zhejiang province as an example, ANSYS workbench software was used to analyze and calculate the stress and displacement of this shed, and it was found that the maximum stress value could reach 88.641 MPa and the maximum bit amount was 10.316 mm. Compared with the traditional plastic continuous shed, the optimized structure of wind and pressure-resistant continuous shed can effectively reduce the arch displacement and enhance the stability of the structure.

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“…There are currently three main methods to determine wind pressure coefficients, i.e., field experiment, wind tunnel test, and computational fluid dynamics (CFD). These methods were compared and presented, and the effects of greenhouse type, greenhouse roof angle and roof spacing were discussed respectively to determine the wind pressure on low-rise buildings or greenhouses in [11][12][13][14]. In these documents, Agronomy 2023, 13, 553 2 of 19 only Wang et al [14] mentioned the impact of topographic factors such as mountain terrain on greenhouse partial pressure, but they still did not give a specific research plan.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Wind Pressure Coefficients for Single-Span Arched Plastic Greenhouses Located in a Valley Region Using CFD

Liang

et al. 2023

Agronomy

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The wind pressure coefficient is essential for calculating the wind loads on greenhouses. The wind pressure on single-span arched greenhouses built in valleys differs from those in plain regions. To promote our understanding of wind characteristics and ensure the structural safety of greenhouses in valley areas, an analysis of the distribution law of wind pressure on greenhouses is required. Firstly, we carried out a survey on greenhouse distribution and undulate terrain distribution near greenhouses in Tibet and measured the air density in Lhasa, Tibet. Then, employing the validated realizable k-ε turbulence model and the verification of grid independence, the wind pressure on greenhouses with different greenhouse azimuths was investigated. According to the survey results, values, such as the distance between the greenhouse and the mountain in addition to the greenhouse azimuth, were also obtained for calculating the wind pressure on greenhouses placed in valleys. A calculation model considering the relationship between the mountain distance and the wind pressure coefficient is proposed, whose results fit well with the results from computational fluid dynamics. The relative errors between the two different results are within 15%. Research shows that there is a canyon wind effect in the valley area, and its effect on wind pressure should be considered in greenhouse design. This research is valuable for the design of plastic greenhouses built in Tibet or other valley regions.

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Wind pressure acting on greenhouses: A review

Cited by 14 publications

References 55 publications

Greenhouse Natural Ventilation Models: How Do We Develop with Chinese Greenhouses?

Greenhouse Natural Ventilation Models: How Do We Develop with Chinese Greenhouses?

New Wind and Pressure-resistant Structural Design and Static Simulation Analysis of Continuous Greenhouse

Analysis of Wind Pressure Coefficients for Single-Span Arched Plastic Greenhouses Located in a Valley Region Using CFD

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