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首页> 外文期刊>Acta Horticulturae >Measurement and numerical simulation of microclimate in a naturally-ventilated large multi-span glasshouse.
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Measurement and numerical simulation of microclimate in a naturally-ventilated large multi-span glasshouse.

机译：自然通风的大跨度温室的小气候的测量和数值模拟。

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Within the practical context of mechanisms comprehension involved in greenhouse climate, this paper considers the problem of natural ventilation with particular attention paid to the determination of the ventilation rate. In view to gain some physical insight on to this process under temperate climate, both experimental and numerical approaches have been developed. Measurements were carried out in a 2500 m2 commercial glasshouse equipped with continuous roof vents. Speed and direction of the wind and air temperature were measured outside the building. Temperature was also recorded both on the walls and in the middle of the greenhouse. The tracer gas (N2O) technique was used to assess the ventilation rate. Numerical resolution was performed using a commercial computational fluid dynamics (CFD) package. The model solves the 2D Navier-Stokes equations with a kappa - epsilon closure. The boundary conditions were inferred from the experimental data. The simulated ventilation rate was compared to the experimental data, for three different openings configurations, and with other results already published in the literature. Results show that wind speed and direction combined with vent opening size strongly affect the inside air flow and temperature patterns as well as the ventilation rate. Simulated ventilation flux seems however to be underestimated probably because the model does not consider leakage rates and 3D circulations. Such a tool could nevertheless be improved in order to be used as a design device to optimize ventilation in greenhouses..
机译：在涉及温室气候的机制理解的实际背景下，本文考虑了自然通风问题，尤其要注意通风率的确定。为了在温带气候下对此过程获得一些物理见解，已经开发了实验方法和数值方法。在配有连续屋顶通风口的2500平方米的商业温室中进行测量。在建筑物外测量了风速和风向以及空气温度。在墙壁和温室中间也记录了温度。示踪气体（N2O）技术用于评估通风率。使用商业计算流体动力学（CFD）软件包执行数值解析。该模型使用kappa-epsilon封闭求解二维Navier-Stokes方程。从实验数据推断出边界条件。对于三种不同的开口配置，将模拟通风率与实验数据进行了比较，并与其他已在文献中发表的结果进行了比较。结果表明，风速和风向与通风口的大小相结合会强烈影响内部气流和温度模式以及通风速率。但是，似乎模拟通风量被低估了，这可能是因为该模型未考虑泄漏率和3D循环。尽管如此，仍可以改进这种工具，以用作优化温室中通风的设计设备。

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