Thermohydraulic performance parameter based experimental investigation of frustum shaped roughened solar air heater

IF 1.2 4区工程技术 Q3 ENGINEERING, MECHANICAL

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy Pub Date : 2024-01-29 DOI:10.1177/09576509241227754

Dharam Singh, Vikash Kumar

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Abstract

An outdoor experimental investigation was conducted to explore the thermohydraulic characteristic (Nusselt no. and friction factor) of artificial roughened solar air heater (ARSAH) having frustrum shaped roughened element on absorber plate. Data were recorded and further processed to generate Nusselt number and friction factor correlation to predict the effect of flow and roughness parameter on performance of ARSAH. The investigation was conducted by varying Reynolds number in range of 2500–12,500. Dimensionless parameter for Frustrum shaped roughness was relative frustum height (e/Dh) from 0.013 to 0.054, relative frustum pitch (p/e) from 8 to 14, Relative frustum height to base diameter (e/d1) from 0.37 to 0.75, relative frustum diametral ratio (d1/d2) from 1 to 3. Maximum performance for ARSAH was obtained corresponding to the optimum value of flow and geometric parameter. The geometric orientation of the proposed roughness geometry produced tremendous rise in Nu with an acceptable rise in friction (f). Maximum enhancement in Nu for varying p/e, e/Dh, e/d1, and d1/d2 was, 4.58, 5.21, 6.62 and 6.09 times and that of friction was 5.59, 4.69, 4.92 and 4.66 times respectively over conventional SAH. Maximum Thermohydraulic performance was 3.7, 3.6, 3.9 and 3.8 at p/e = 12, e/Dh = 0.054, e/d1 = 0.75 and d1/d2 = 3.

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基于热水力学性能参数的挫面粗化太阳能空气加热器实验研究

通过室外实验研究，探索了在吸收板上具有沮渠形粗糙元件的人工粗糙化太阳能空气加热器（ARSAH）的热液压特性（努塞尔特数和摩擦因数）。对数据进行记录和进一步处理，生成相关的努塞尔特数和摩擦因数，以预测流动和粗糙度参数对 ARSAH 性能的影响。研究在 2500-12500 雷诺数范围内进行。相对挫面高度 (e/Dh) 从 0.013 到 0.054，相对挫面间距 (p/e) 从 8 到 14，相对挫面高度与底面直径 (e/d1) 从 0.37 到 0.75，相对挫面直径比 (d1/d2) 从 1 到 3。所建议的粗糙度几何形状的几何方向产生了巨大的 Nu 值增长，同时摩擦力 (f) 也有可接受的增长。与传统的 SAH 相比，在 p/e、e/Dh、e/d1 和 d1/d2 变化时，Nu 的最大提升分别为 4.58、5.21、6.62 和 6.09 倍，摩擦的最大提升分别为 5.59、4.69、4.92 和 4.66 倍。当 p/e = 12、e/Dh = 0.054、e/d1 = 0.75 和 d1/d2 = 3 时，最大热液压性能分别为 3.7、3.6、3.9 和 3.8。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 工程技术-工程：机械

CiteScore

3.30

自引率

5.90%

发文量

114

审稿时长

5.4 months

期刊介绍： The Journal of Power and Energy, Part A of the Proceedings of the Institution of Mechanical Engineers, is dedicated to publishing peer-reviewed papers of high scientific quality on all aspects of the technology of energy conversion systems.