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CFD modeling and testing of an extended-duct air delivery system in high bay buildings

机译：高湾建筑中扩展管道空气输送系统的CFD建模与测试

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Mixing ventilation in high-bay buildings conditioned by rooftop units involves supplying and returning air near the ceiling. Several problems occur in tall spaces, such as higher return air temperatures in the summer and excessive stratification in the winter. An air delivery strategy was investigated that involves supplying and returning air at different heights depending on the season. In the summer, air is supplied low and returned just above the occupied zone to cool the occupied zone directly, letting the upper zone stratify. In the winter, air is supplied high and returned low to draw warm air down from the ceiling, thus promoting destratification. This system's performance was investigated through a computational fluid dynamics (CFD) study. CFD modeling results reveal the effects of supply and return duct locations on room airflow and stratification generation. The room temperature gradient is less sensitive to return duct height than to supply duct height, though increasing the return duct height slightly reduced stratification and the average room temperature. CFD modeling results were validated against full-scale experimental testing results with good agreement.
机译：屋顶单位调节的高湾建筑物中的通风涉及在天花板附近提供和返回空气。高大空间出现了几个问题，例如夏季的较高返回空气温度，冬季过度分层。调查了空中交付策略，涉及根据季节提供和返回不同高度的空气。在夏季，空气供应较低并刚刚返回占用区以上，直接冷却占用区，让上部区域分层。在冬季，空气供应高，返回低电平以从天花板下汲取温暖的空气，从而促进堕落。通过计算流体动力学（CFD）研究调查了该系统的性能。 CFD建模结果揭示了供应和返回管道位置对室内气流和分层发电的影响。房间温度梯度对返回管道高度不如供应管道高度敏感，尽管返回管道高度略微降低分层和平均室温。 CFD建模结果验证了与良好一致性的全规模实验测试结果。

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