Analyzing convective heat transfer in combined solar chimneys: A theoretical and numerical study of key influencing parameters

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy Pub Date : 2024-11-19 DOI:10.1016/j.renene.2024.121933

Huimin Cui , Mengjiao Han , Jitao Zhang , Zhiming Han , Qingkuan Liu

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引用次数: 0

Abstract

Combined solar chimneys represent a potent mechanism for harnessing solar energy to bolster natural ventilation in green building designs. This study focuses on the impact of structural parameters and external conditions on the ventilation and heat transfer performance of such systems. Through scaling analysis and numerical simulations, this study investigate the flow dynamics and heat transfer mechanisms. The mechanism and the influence of three critical control parameters: inlet size ratio (h/H), ratio of inclined to vertical section lengths (L/H), and Rayleigh number (Ra) is examined. The results indicate that ventilation and heat exchange performance exhibit an initial increase followed by a decline as the inlet size ratio expands from 0.10 to 0.40. Optimal ventilation efficiency is observed at a Rayleigh number of 1.98 × 10¹⁴ with an inlet size ratio of 0.15. Conversely, a low ratio of inclined to vertical section lengths (L/H = 0.20) correlates with suboptimal ventilation performance. Both ventilation intensity and efficiency are positively correlated with increases in Ra. This research quantitatively delineates these relationships, providing a theoretical foundation for the design of natural ventilation systems in sustainable buildings using combined solar chimneys.

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分析组合式太阳能烟囱中的对流传热：关键影响参数的理论和数值研究

组合式太阳能烟囱是在绿色建筑设计中利用太阳能促进自然通风的有效机制。本研究的重点是结构参数和外部条件对此类系统通风和传热性能的影响。通过缩放分析和数值模拟，本研究探讨了流动动力学和传热机制。研究了三个关键控制参数：入口尺寸比（h/H）、倾斜段与垂直段长度比（L/H）和瑞利数（Ra）的机制和影响。结果表明，当入口尺寸比从 0.10 扩大到 0.40 时，通风和热交换性能呈现先上升后下降的趋势。当雷利数为 1.98 × 1014 时，入口尺寸比为 0.15，通风效率最佳。相反，倾斜段长度与垂直段长度之比过低（L/H = 0.20）则通风效果不理想。通风强度和效率都与 Ra 的增加呈正相关。这项研究定量地描述了这些关系，为在可持续建筑中使用组合式太阳能烟囱设计自然通风系统提供了理论基础。

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

Renewable Energy 工程技术-能源与燃料

CiteScore

18.40

自引率

9.20%

发文量

1955

审稿时长

6.6 months

期刊介绍： Renewable Energy journal is dedicated to advancing knowledge and disseminating insights on various topics and technologies within renewable energy systems and components. Our mission is to support researchers, engineers, economists, manufacturers, NGOs, associations, and societies in staying updated on new developments in their respective fields and applying alternative energy solutions to current practices. As an international, multidisciplinary journal in renewable energy engineering and research, we strive to be a premier peer-reviewed platform and a trusted source of original research and reviews in the field of renewable energy. Join us in our endeavor to drive innovation and progress in sustainable energy solutions.