Numerical Study and Geometrical Investigation of an Inclined Passive Wall Solar Chimney over the Ventilation Performance of an Attached Room

IF 1.3 4区工程技术 Q3 ENGINEERING, MECHANICAL Journal of Engineering Thermophysics Pub Date : 2024-04-10 DOI:10.1134/s1810232824010077

M. R. Leão, G. Lorenzini, T. M. Claudino, C. B. Maia, L. A. O. Rocha, L. A. Isoldi, E. S. D. Estrada, E. D. Dos Santos

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Abstract

The present numerical work investigates by means of Constructal Design the influence of the geometry of an inclined passive wall solar chimney on the ventilation performance of an attached room. The main purpose is to maximize the mass flow rate of air in the chimney/attached room. The problem is subjected to two constraints: the chimney and room areas. Three degrees of freedom are investigated: the ratio between the exit and inferior bases widths of the chimney (\(W_{e}/W_{g})\), the ratio between the width of the chimney inferior basis and the absorber wall height (\(W_{g}/H_{a})\), and the ratio between the opening that connects chimney and room and the absorber wall height (\(H_{i}/H_{a})\). It is considered unsteady, incompressible, free convective, turbulent flows in a two-dimensional domain. The finite volume method is used to solve the time-averaged equations of continuity, momentum and conservation of energy. For closure of turbulence, it is employed the \(k\)-\(\varepsilon\) model. Results showed that the best geometric configuration led to a mass flow rate 5.7 times superior than the worst configuration, showing the importance of solar chimney desing in this problem. Moreover, a strong sensibility of the investigated ratios on the mass flow rate was noticed.

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倾斜式被动墙太阳能烟囱对附属房间通风性能的数值研究和几何调查

摘要本数值研究通过结构设计方法研究了倾斜被动墙太阳能烟囱的几何形状对附属房间通风性能的影响。主要目的是最大限度地提高烟囱/附属房间的空气质量流量。该问题有两个约束条件：烟囱和房间面积。对三个自由度进行了研究：烟囱出口和下底座宽度之比（\(W_{e}/W_{g})\）、烟囱下底座宽度与吸收壁高度之比（\(W_{g}/H_{a})\）以及连接烟囱和房间的开口与吸收壁高度之比（\(H_{i}/H_{a})\）。考虑的是二维域中的非稳态、不可压缩、自由对流、湍流。采用有限体积法求解连续性、动量和能量守恒的时间平均方程。为了封闭湍流，采用了（k）-（varepsilon）模型。结果表明，最佳几何配置的质量流量是最差配置的 5.7 倍，这表明了太阳能烟囱设计在这个问题上的重要性。此外，还注意到所研究的比率对质量流量有很强的敏感性。

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来源期刊

Journal of Engineering Thermophysics THERMODYNAMICS-ENGINEERING, MECHANICAL

CiteScore

2.30

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： Journal of Engineering Thermophysics is an international peer reviewed journal that publishes original articles. The journal welcomes original articles on thermophysics from all countries in the English language. The journal focuses on experimental work, theory, analysis, and computational studies for better understanding of engineering and environmental aspects of thermophysics. The editorial board encourages the authors to submit papers with emphasis on new scientific aspects in experimental and visualization techniques, mathematical models of thermophysical process, energy, and environmental applications. Journal of Engineering Thermophysics covers all subject matter related to thermophysics, including heat and mass transfer, multiphase flow, conduction, radiation, combustion, thermo-gas dynamics, rarefied gas flow, environmental protection in power engineering, and many others.