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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >Performance Evaluation of a Solar Air Heater Roughened with Conic‑Curve Profile Ribs Based on Efficiencies and Entropy Generation
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Performance Evaluation of a Solar Air Heater Roughened with Conic‑Curve Profile Ribs Based on Efficiencies and Entropy Generation

机译：太阳能空气加热器的性能评估基于效率和熵生成的圆锥形曲线肋骨粗糙化

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摘要

First and second laws of thermodynamics are well-established benchmarks to assess a thermal system. The literature revealed that efficiencies of a solar air heater are still low because the transport properties and heat transfer coefficient of the air are not superior. In the previous study, the heat and fluid flow characteristics and thermohydraulic performance of the solar air heater roughened conic-curve profile ribs were numerically examined. In the present extended work, the thermal efficiency, effective efficiency, and exergy efficiency were analytically evaluated. The entropy generation in the vicinity of the rib and the Bejan number along the length of the absorber plate were numerically analysed. These considerations aimed to provide a comprehensive evaluation and subsequent minimization of entropy generation. The impacts of the conic constant and Reynolds number on the above parameters were considered. The results indicated that decreasing the conic constant induced an increase in all efficiencies and a decrease in the entropy generation number. The maximum effective efficiency of 0.6719 occurred at a Reynolds number of 20,122, whereas the exergy efficiency of 0.01527 was obtained at a Reynolds number of 2786. The highest entropy generation due to heat transfer was found at the upstream and downstream corners of a rib and at the position just behind the detachment point. The largest entropy generation due to viscous dissipation was identified at the position in front of the rib tip. The entropy generation due to heat transfer was much higher than the entropy generation due to viscous dissipation.
机译：第一和第二热力学定律是建立良好的基准，以评估热系统。文献透露，太阳能空气加热器的效率仍然很低，因为空气的传输性能和传热系数不优越。在先前的研究中，在数值检查了太阳能空气加热器粗糙化圆形曲线肋骨的热和流体流动特性和热液压性能。在目前的延长工作中，分析了热效率，有效效率和高效率。在数值分析肋骨附近的熵和沿吸收板的长度的凸起的熵生成。这些考虑因素旨在提供综合评估和随后的熵生成最小化。考虑了锥形常数和雷诺数对上述参数的影响。结果表明，降低锥度常数诱导所有效率的增加和熵产生数量的减少。 0.6719的最大有效效率发生在雷诺数20,122，而在雷诺数为2786的雷诺数获得了0.01527的效率。在肋骨的上游和下游角上发现了由于传热引起的最高熵产生脱离点后面的位置。在肋尖前面的位置鉴定了由于粘性耗散引起的最大熵生成。由于粘性耗散导致引起的熵产生远高于熵产生。

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