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External wind on the optimum designing parameters of a wall solar chimney in building

机译：外部风在建筑中墙太阳能烟囱的最佳设计参数

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Solar chimney is a reliable renewable energy system that enhances the natural ventilation to reduce the energy consumption in buildings. Under the fact that previous optimization designs usually ignore the external wind, the impacts of external wind on the optimum designing parameters are then investigated. It is confirmed that external wind could affect its optimum designing parameters, which are different from those previously obtained value in the literature without considering the external wind. For the analysed wall solar chimney, it was known that previously obtained optimal cavity depth of 0.2-0.3 m is no longer applicable under the external wind, and the optimal value rises to 0.4-0.5 m, while the same applies to inlet height/area. Solar chimney performance is enhanced under the external wind, which is not only because of the incoming wind flow from the room opening but also the reduced air resistance. It was observed that increased solar intensity shows limited influences on the overall airflow characteristics. Solar chimney performance also presented a generally enhanced trend under a low external wind speed, but a strong wind could dominate its performance with limited fluctuation even though the wind angle is higher as 45 degrees. It was known that the airflow rates through the solar chimney are largely hampered with a small cavity depth (i.e., smaller than 0.2 m) and inlet height under the external wind. And the airflow profiles are less affected when both of cavity depth and inlet height are bigger than 0.2 m. The obtained research outcomes could provide a technical guide on the optimization design of solar chimney in buildings.
机译：太阳烟囱是一种可靠的可再生能源系统，可增强自然通风，以降低建筑物的能源消耗。在先前的优化设计通常忽略外部风的情况下，然后研究了外部风对最佳设计参数的影响。确认外部风可以影响其最佳设计参数，这与文献中先前获得的价值不同，而不考虑外部风。对于分析的墙壁太阳能烟囱，已知先前获得的最佳腔深度为0.2-0.3μ，不再适用于外部风，最佳值升至0.4-0.5米，而同样适用于入口高度/区域。在外部风下，太阳能烟囱性能增强，这不仅是因为从房间开口的进入的风流量，而且还有降低的空气阻力。观察到，由于对整体气流特性，太阳能增加显示了有限的影响。太阳能烟囱性能也在低外部风速下呈现出一般增强的趋势，但是强风可以使其性能占据有限的波动，即使风角高达45度。众所周知，通过太阳烟囱的气流速率在很大程度上被妨碍腔深（即，小于0.2米）和外部风的入口高度。当空腔深度和入口高度大于0.2米时，气流型材的影响较小。获得的研究结果可以提供建筑物太阳能烟囱优化设计技术指南。

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