Experimental analysis on the effect of multi-level array hollow semi-stadium fins (HSSF) and baffles on solar thermal air collector

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI:10.1016/j.csite.2025.106165

Muhammad Aqil Afham Rahmat , Adnan Ibrahim , Khaled M. Al-Aribe , Muhammad Ubaidah Syafiq Bin Mustaffa , Ihsan Okta Harmailil , Sahibzada Imad Ud Din

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Abstract

An energy crisis is caused by the world's population expansion and growing energy consumption by global civilization, which encourages the usage of renewable energy technologies such as solar thermal collectors. Inefficient heat transmission lowers energy conversion and collector performance. This research aims to utilize a multi-level array of hollow semi-stadium fins (HSSF) with baffles to evaluate experimentally the double-pass solar air collector energy utilization. The proposed collectors with baffles and 1:2 and 1:4 multi-level spacing gaps are compared to the flat plate design at mass flow rates of 0.01–0.08 kg/s and irradiances of 400–800 W/m². The experimental findings are verified with numerical and previously experimental studies. The findings indicated that the newly double-pass solar collector achieved a maximum thermal efficiency of 77.70 % at 800 W/m², the highest useful energy of 934.83 Watts, and the highest enhancement efficiency of 30.67 %, indicating better performance than the flat plate design. Optimal efficiency was found at flow rates of 0.04 kg/s (400 W/m²) and 0.07 kg/s (600–800 W/m²). Increasing mass flow rates reduces friction factors while raising pressure drops. Validation with numerical results contains a 0.67–4.96 % error. Field-based experimental research, exergy and thermohydraulic studies, and economic and environmental studies are recommended to evaluate the design's effectiveness and feasibility.

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多层阵列中空半体育场翅片和挡板对太阳热风集热器影响的实验分析

能源危机是由世界人口膨胀和全球文明不断增长的能源消耗引起的，这鼓励了太阳能集热器等可再生能源技术的使用。低效的传热降低了能量转换和集热器的性能。本研究旨在利用带挡板的多层空心半体育场翅片阵列（HSSF）对双通道太阳能空气集热器的能量利用进行实验评估。在质量流量为0.01-0.08 kg/s，辐照度为400-800 W/m2的情况下，将设计的隔板和1:2和1:4多级间距的集热器与平板设计进行了比较。实验结果与数值和先前的实验研究相验证。研究结果表明，在800w /m2时，双通道太阳能集热器的最大热效率为77.70%，最大有用能量为934.83 Watts，最大增强效率为30.67%，优于平板设计。流速为0.04 kg/s （400 W/m2）和0.07 kg/s （600-800 W/m2）时，效率最高。增加质量流量可以减少摩擦因素，同时提高压降。数值结果验证误差为0.67 ~ 4.96%。建议进行实地实验研究、火用和热水力研究以及经济和环境研究，以评估设计的有效性和可行性。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.