Comparison of the induced flow obtained with 2D and 3D CFD simulations of a solar chimney at different width-to-gap ratios

IF 1.8 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Y. Q. Nguyen, T. N. Huynh, Khoa Le-Cao
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Abstract

Solar chimneys are among the most common methods for natural ventilation of buildings. Computational Fluid Dynamics (CFD) has been widely applied in research and design of solar chimneys. Most of the previous studies are based on 2D CFD models which ignore the effects of the width (the third dimension) of the air channel. In addition, the applicability of 2D models for the solar chimneys with a low width-to-gap ratio is still questionable. This study investigates both 2D and 3D CFD models for window-sized vertical solar chimneys. The 2D model is applied to the domain comprising the central plane of the channel gap ( G) and height ( H) while the 3D model is applied to the domain consisting of the channel gap, height, and width ( W). The flow fields, flow rates and thermal efficiencies computed with the 2D and 3D models at different heights, gaps, and widths are compared. The results show that W/ G is the most crucial factor. The effects of the side walls are significant at a low W/ G but gradually diminishes as W/ G increases. At W/ G = 15, the side wall effects are confined to a region of about 2.6% W. Particularly, for W/ G>8, the differences between the 2D and 3D flow rates and thermal efficiencies are within ±5%. These findings offer a reference for researchers and engineers to select between 2D and 3D CFD models for a specific solar chimney.
通过二维和三维 CFD 模拟太阳能烟囱在不同宽隙比下的诱导流比较
太阳能烟囱是建筑物自然通风最常用的方法之一。计算流体动力学(CFD)已被广泛应用于太阳能烟囱的研究和设计。以往的研究大多基于二维 CFD 模型,忽略了空气通道宽度(三维)的影响。此外,二维模型是否适用于宽隙比较小的太阳能烟囱仍是个问题。本研究针对窗户大小的垂直太阳能烟囱,研究了二维和三维 CFD 模型。二维模型适用于由通道间隙(G)和高度(H)的中心平面组成的域,而三维模型适用于由通道间隙、高度和宽度(W)组成的域。比较了二维和三维模型在不同高度、间隙和宽度下计算出的流场、流速和热效率。结果表明,W/ G 是最关键的因素。在 W/ G 较低时,侧壁的影响很大,但随着 W/ G 的增加,影响逐渐减小。当 W/ G = 15 时,侧壁效应局限于约 2.6% W 的区域。特别是当 W/ G>8 时,二维和三维流速和热效率的差异在 ±5% 以内。这些发现为研究人员和工程师针对特定太阳能烟囱选择二维和三维 CFD 模型提供了参考。
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
Journal of Building Physics
Journal of Building Physics 工程技术-结构与建筑技术
CiteScore
5.10
自引率
15.00%
发文量
10
审稿时长
5.3 months
期刊介绍: Journal of Building Physics (J. Bldg. Phys) is an international, peer-reviewed journal that publishes a high quality research and state of the art “integrated” papers to promote scientifically thorough advancement of all the areas of non-structural performance of a building and particularly in heat, air, moisture transfer.
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