Modelling of cowl performance in building simulation tools using experimental data and computational fluid dynamics

被引:15
|
作者
Pfeiffer, Andreas [1 ]
Dorer, Viktor [1 ]
Weber, Andreas [1 ]
机构
[1] Empa, Swiss Fed Labs Mat Testing & Res, Energy Syst & Bldg Equipment Lab, CH-8600 Dubendorf, Switzerland
关键词
hybrid ventilation; exhaust cowls; simulation; computational fluid dynamics; CFD; natural ventilation; airflow around buildings;
D O I
10.1016/j.buildenv.2007.01.038
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Exhaust cowls are used in conjunction with hybrid ventilation systems to efficiently convert wind energy into negative pressure and thus minimize the electrical energy required by the extract fan. Yet the fact that cowl performance is largely dictated by operating conditions imposes particularly stringent demands on modelling. This paper demonstrates, by way of a concrete example, the need for and potential benefits of a new methodological approach to the modelling of cowls. The study focuses on a specific modelling strategy, applied within a building simulation program, for a cowl used in a hybrid ventilation system. The method is progressively simplified to produce four variants, which chiefly vary according to their level of detail and, hence, the associated modelling effort. Wind pressure coefficients at facade, above roof and in the cowl are needed for all model variants. Some of the investigated variants rely on CFD computations of airflow around the building to determine these values. This study uses the example of a single-family house (SFH) to identify those criteria requiring particular attention in the performance of CFD numerical flow analyses. All four variants are examined on the basis of this example to determine which simplifications to the model are appropriate and permissible without unduly compromising the accuracy of the results. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1361 / 1372
页数:12
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