TRANSIENT THERMAL ANALYSIS OF A DOUBLE DUCT SOLAR ROOF CHIMNEY COUPLED WITH A SCALED ROOM

IF 2.1 4区工程技术 Q3 ENERGY & FUELS

Journal of Solar Energy Engineering-transactions of The Asme Pub Date : 2023-08-16 DOI:10.1115/1.4063185

Jose Ma Navarro, Adolfo Vazquez, J. Hinojosa, Saul F Moreno, V. M. Maytorena

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Abstract

This research presents a detailed transient experimental and computational study of heat transfer and airflow in a scaled room linked with a double-duct vertical roof solar chimney (SC). The analysis was made in the coupled system, varying the heat flux supplied to the roof SC absorber during the day. Experimental temperature profiles were obtained at six different depths and heights, the empirical heat transfer coefficient was computed for the SC absorber, and the variation of air changes per hour was determined. A good agreement between experimental and numerical temperature profiles and average Nusselt number (Nut), being in the latter of average difference of 3.41%. The validated computational model was used to analyze the effect of the transient heating of the SC on temperature fields and flow patterns in the thermal system. Almost symmetrical temperature and y-velocity profiles are formed in the ducts at different hours of the day, with thermal boundary layers of about 4 mm. Correlations of the Nusselt number and air changes per hour (ACH) are provided as a function of the modified Rayleigh number.

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双风道太阳能屋顶烟囱与缩放房间耦合的瞬态热分析

本研究对与双管道垂直屋顶太阳能烟囱（SC）相连的缩放房间中的传热和气流进行了详细的瞬态实验和计算研究。分析是在耦合系统中进行的，在白天改变提供给屋顶SC吸收器的热通量。获得了六种不同深度和高度的实验温度分布，计算了SC吸收器的经验传热系数，并确定了每小时空气变化的变化。实验和数值温度分布与平均努塞尔数（Nut）之间有很好的一致性，后者的平均差值为3.41%。使用经过验证的计算模型分析了SC的瞬态加热对热系统中温度场和流型的影响。在一天中的不同时间，管道中形成了几乎对称的温度和y速度分布，热边界层约为4mm。努塞尔数和每小时空气变化量（ACH）的相关性作为修正瑞利数的函数提供。

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 Solar Energy Engineering-transactions of The Asme 工程技术-工程：机械

CiteScore

5.00

自引率

26.10%

发文量

审稿时长

6.0 months

期刊介绍： The Journal of Solar Energy Engineering - Including Wind Energy and Building Energy Conservation - publishes research papers that contain original work of permanent interest in all areas of solar energy and energy conservation, as well as discussions of policy and regulatory issues that affect renewable energy technologies and their implementation. Papers that do not include original work, but nonetheless present quality analysis or incremental improvements to past work may be published as Technical Briefs. Review papers are accepted but should be discussed with the Editor prior to submission. The Journal also publishes a section called Solar Scenery that features photographs or graphical displays of significant new installations or research facilities.