Impact of the V CAP on induced turbulent air flow in a solar chimney: a computational study

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-04-18 DOI:10.18186/thermal.1285240

N. Phu, Nguyen Hoang Kha, N. Hap

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Abstract

In this paper, a 2D numerical simulation of a solar chimney with a top V cap was performed to evaluate the induced air flow degradation. Dimensions including the width of the cap and the cap offset from the top of chimney are specified as key parameters. Meanwhile, height and width of the chimney are fixed. The numerical model was confirmed to be accurate compared to the published data. The results showed that reducing the offset and increasing the width reduces airflow through the chimney. The effect of offset on chimney intake air is significant. When considering the addition of the top V cap, the airflow is reduced by about 20% compared to the chimney without a cap. This is because the cap forms three primary vortices including one vortex below the cap and two ones above the cap. The vortex under the cap in the direction from the absorber plate to the glass cover increases the air flow out of chimney at the side of the glass cover. The region with great turbulent kinetic energy forms at upper side of the cap. The air flow correlation as a function of the heat flux to the absorber plate, cap offset and cap width have been developed with errors of less than 2.5%.

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V CAP对太阳能烟囱内诱导湍流气流影响的计算研究

本文对带有顶V帽的太阳能烟囱进行了二维数值模拟，以评估其诱导气流退化。尺寸包括帽的宽度和帽与烟囱顶部的偏移量被指定为关键参数。同时，烟囱的高度和宽度是固定的。通过与已发表数据的比较，证实了数值模型的准确性。结果表明，减小偏置和增大宽度可以减少烟囱内的气流。偏置对烟囱进气量的影响是显著的。当考虑增加顶部V帽时，与没有帽的烟囱相比，气流减少了约20%。这是因为帽形成了三个主要涡，包括帽下的一个涡和帽上的两个涡。帽下从吸收板到玻璃罩方向的涡增加了从玻璃罩侧面烟囱流出的气流。湍流动能较大的区域形成于帽的上部。气流与吸收板热流密度、帽偏移量和帽宽度的相关关系得到了误差小于2.5%的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.