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首页> 外文期刊>Acta Horticulturae >Numerical analysis of wind microclimatic effects on a plastic greenhouse protected by a windbreak in different seasonal periods
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Numerical analysis of wind microclimatic effects on a plastic greenhouse protected by a windbreak in different seasonal periods

机译：不同季节性时期防风雨保护塑料温室的风微跨越效应的数值分析

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摘要

Windbreaks are frequently used to protect greenhouses. Agricultural plastic nets are widely used for the construction of such windbreaks replacing the traditional natural windbreaks formed by trees. When installed against the dominant wind direction at an optimized distance from the greenhouse side walls, windbreaks may reduce wind loads. An additional effect of the provided protection against strong cold winds is the reduction of heat losses during the winter period. However, the effect of windbreaks in situations when cooling is necessary, particularly in cases of low wind speeds during summer period, has not been investigated so far. The present work aims to analyse the energy efficiency and the wind flow around and through an arched-roof greenhouse with two side and one roof opening (windows) in two extreme cases, namely a) a high velocity cold wind causing important heat losses on the greenhouse (closed windows), and b) a low velocity wind speed resulting to buoyancy-driven ventilation in thegreenhouse (open windows). In the first case the reduction of heat losses due to the windbreak are explored. In the second case, the possible dissipation of the ventilation airflow and the corresponding temperature variations by the windbreak is investigated. Computational Fluid Dynamics (CFD) numerical simulations are used in the present work.
机译：防风妇经常用于保护温室。农业塑料网广泛用于建设这种挡风果，取代树木形成的传统自然风沙。当从温室侧壁的优化距离安装在优势风向上时，防风会可能会降低风力载荷。提供的额外效果对强烈的冷风的效果是在冬季期间减少热量损失。然而，到目前为止，在需要冷却时，防风在避暑速度的情况下，尤其是在夏季的低风速的情况下。目前的工作旨在分析能源效率和风流在两个极端情况下用两侧和一个屋顶开口（窗户）的拱形屋顶温室，即a）高速冷风导致重要的热量损失温室（封闭的窗户）和b）低速风速，导致在Greenhouse（敞开窗户）中浮现驱动的通风。在第一种情况下，探讨了防风所引起的热量损失。在第二种情况下，研究了通风气流的可能耗散和防风纹的相应温度变化。在本作工作中使用计算流体动力学（CFD）数值模拟。

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