Influence of exhaust wind cowls on wind driven ventilation

被引：0

作者：

He G.-Q. ^{[1
]}

Tang Y.-T. ^{[1
]}

机构：

[1] College of Civil Engineering and Architecture, Zhejiang University, Hangzhou

来源：

Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2023年 / 57卷 / 03期

关键词：

gradient wind; openings arrangement; solar chimney; wind cowl; wind driven ventilation; wind tunnel test;

D O I：

10.3785/j.issn.1008-973X.2023.03.017

中图分类号：

学科分类号：

摘要：

A scaled model of solar chimney building was designed and tested in a wind tunnel, to investigate the impact of wind pressure related factors and wind cowls on the discharging performance of high exhaust of a building. A comparison study between a common elbow outlet and two wind cowls (a louver type and a baffle type) was conducted to investigate their influences on wind pressure distributions and the resulting ventilation rate. Results show that under the gradient-profiled wind, the influence of the net height difference between the inlet and outlet on the ventilation rate cannot be ignored. The resulting wind pressure at the high exhaust was in general greater than that of the lower inlet. When the roof-mounted elbow outlet was facing the wind, the reverse flow occurred, which was against the chimney flow and weakened the stack ventilation design. Both wind cowls prevented the reverse flow. However, the baffle type was superior to the other. It produced the largest ventilation rate among the three outlets except for the side-wind case, where its flow rate was 28% lower than that of the elbow outlet case. The flow rate of the baffle type outlet was 57% and 33% higher than that of the elbow outlet in the windward and leeward directions, respectively. In the design of building ventilation systems with high exhaust, such as solar chimneys, the inlet needs to be placed at windward side as much as possible, while the outlet needs to be placed as high as possible. And the baffle type wind cowl is recommended. © 2023 Zhejiang University. All rights reserved.

引用

页码：591 / 597

页数：6

共 22 条

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