Study on characteristics of natural ventilation strengthened by solar chimney in underground space

被引：0
|
作者：
Yao L. [1 ]
Chen Z. [1 ]
Li M. [1 ]
Zeng Z. [2 ]
机构：
[1] College of Engineering and Technology, Southwest University, Chongqing
[2] Department of Engineering Mechanics, Chongqing University, Chongqing
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2021年 / 42卷 / 06期
关键词：
Aspect ratio; Natural convection; Rayleigh number; Solar chimney; Ventilation equipment;
D O I：
10.19912/j.0254-0096.tynxb.2019-0180
中图分类号：
学科分类号：
摘要：
Solar chimney has become an effective method to strengthen indoor ventilation. Therefore, the characteristics of natural ventilation induced by the solar chimney in an underground space is numerically investigated. Firstly, a model representing the underground space equipped with a vertical solar chimney is built. Then the influence of Rayleigh number ([Ra]) and chimney aspect ratio on the mass flow rate at the outlet are studied. The results show that with the increase of[Ra], the dimensionless mass flow rate at the outlet increases for a certain aspect ratio, but its growth tends to decline when[Ra]exceeds a critical value. It is also found that, for a comparatively smaller[Ra(Ra=103~106), ] the dimensionless mass flow rate at the outlet climbs up first and then declines with the aspect ratio increase, which leads to a peak value. And the corresponding aspect ratio for such peak value decreases as [Ra]increases. While, for a relatively larger[Ra(Ra=107~107), ] the dimensionless mass flow rate at the outlet decreases when the aspect ratio grows. Moreover, the numerical results indicate that, the reverse flow will appear in the chimney for certain [Ra] or aspect ratio, which is a key factor to affect the mass flow rate. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.
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页码：184 / 190
页数：6
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