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.

热力学第一定律和第二定律是评估热系统的公认基准。文献揭示了太阳能空气加热器的效率仍然很低，因为空气的传输特性和传热系数并不优越。在先前的研究中，对太阳能空气加热器粗糙的圆锥曲线轮廓肋的热和流体流动特性以及热工性能进行了数值检查。在当前的扩展工作中，对热效率，有效效率和火用效率进行了分析评估。数值分析了沿吸收板长度方向的肋骨附近的熵的产生和Bejan数。这些考虑旨在提供全面的评估以及随后的熵生成最小化。考虑了圆锥常数和雷诺数对上述参数的影响。结果表明，降低圆锥常数引起所有效率的提高和熵产生数的降低。在雷诺数为20,122时，最大有效效率为0.6719，而在雷诺数为2786时，最大有效效率为0.01527。在肋骨的上游和下游角落以及刚好在分离点后面的位置。在肋骨尖端的前部位置发现了由于粘性耗散而产生的最大熵。由热传递引起的熵产生比由于粘性耗散引起的熵产生高得多。