Effective Efficiency Analysis of Artificially Roughed Solar Air Heater

IF 1.7 4区工程技术 Q3 THERMODYNAMICS Heat Transfer Research Pub Date : 2024-03-01 DOI:10.1615/heattransres.2024052712

MAN AZAD

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Abstract

The solar air heater is a very simple and economical device, but its thermal performance is quite poor. The thermal performance of a solar air heater can be enhanced by increasing the heat transfer between absorber plates and blowing air. Applying artificial roughness to the absorber plate is a unique method for improving the thermal performance of solar air heaters compared to other methods. In this study, diagonally chamfered cuboids were used as roughness elements to investigate the enhancement in the performance of a solar air heater. This roughness is achieved by attaching diagonally chamfered cuboids to the surface of the absorber plate. A thorough experimental investigation was carried out to examine how this roughness affects the perfor-mance of solar air heaters. The study considered several parameters, such as relative roughness pitch (RRP) (ranging from 5 to 8), cuboid arm length (ALC) (varying between 4 and 10 mm), and relative roughness height (RRH) (ranging from 0.44 to 0.077). To ensure turbulent flow during the experiment, the Reynolds number was kept within the range of 4250 to 18000, which is considered ideal for solar air heaters operating with a constant heat flux of 1000 W/m² on the absorber plate. An overall performance assessment of the artificially roughened solar air heater was conducted, taking into account the analysis of the Nusselt number and friction coefficient for both roughened and smooth absorber surfaces operating under similar flow conditions. The analysis reveals 2.48 times improvement in performance of the roughened configuration.

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人工粗加工太阳能空气加热器的有效效率分析

太阳能空气加热器是一种非常简单和经济的设备，但其热性能很差。太阳能空气加热器的热性能可以通过增加吸收板和吹风之间的热传递来提高。与其他方法相比，在吸收板上施加人工粗糙度是提高太阳能空气加热器热性能的一种独特方法。在这项研究中，斜倒角立方体被用作粗糙度元素，以研究太阳能空气加热器性能的提高。这种粗糙度是通过在吸收板表面粘贴斜倒角立方体来实现的。为了研究这种粗糙度如何影响太阳能空气加热器的性能，我们进行了深入的实验研究。研究考虑了多个参数，如相对粗糙度间距 (RRP)（从 5 到 8 不等）、长方体臂长 (ALC)（从 4 到 10 毫米不等）和相对粗糙度高度 (RRH)（从 0.44 到 0.077 不等）。为确保实验过程中的湍流，雷诺数保持在 4250 到 18000 之间，这对于吸收板上热通量恒定为 1000 W/m² 的太阳能空气加热器来说非常理想。对人工粗糙化太阳能空气加热器的整体性能进行了评估，同时考虑了粗糙化和光滑吸收器表面在类似流动条件下运行时的努塞尔特数和摩擦系数分析。分析结果表明，粗化结构的性能提高了 2.48 倍。

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来源期刊

Heat Transfer Research 工程技术-热力学

CiteScore

3.10

自引率

23.50%

发文量

102

审稿时长

13.2 months

期刊介绍： Heat Transfer Research (ISSN1064-2285) presents archived theoretical, applied, and experimental papers selected globally. Selected papers from technical conference proceedings and academic laboratory reports are also published. Papers are selected and reviewed by a group of expert associate editors, guided by a distinguished advisory board, and represent the best of current work in the field. Heat Transfer Research is published under an exclusive license to Begell House, Inc., in full compliance with the International Copyright Convention. Subjects covered in Heat Transfer Research encompass the entire field of heat transfer and relevant areas of fluid dynamics, including conduction, convection and radiation, phase change phenomena including boiling and solidification, heat exchanger design and testing, heat transfer in nuclear reactors, mass transfer, geothermal heat recovery, multi-scale heat transfer, heat and mass transfer in alternative energy systems, and thermophysical properties of materials.