In this paper, Energy, Entropy and Exergy (EEE) analysis of flat plate solar collector is studied through a mathematical model by considering the overall loss coefficient as a non-constant parameter. The overall loss coefficient is calculated by minimizing the top loss coefficient using Lagrange multiplier optimization technique and also by empirical formulas. Further, energy efficiency, entropy generation, exergy destruction and exergy efficiency of the flat plate solar collector are also determined for the both aforesaid overall loss coefficients. The exergy efficiency of the proposed model has been doubled, when compared with the experimental measurements in the earlier literature. Also, comparing the proposed methods, it is observed that exergy efficiency obtained by using the minimal top loss coefficient is reasonably high and it enhances the overall collector’s efficiency.

本文通过将整体损耗系数作为非常量参数，通过数学模型研究平板太阳能集热器的能量、熵和火用（EEE）分析。总损耗系数是通过使用拉格朗日乘数优化技术和经验公式最小化顶部损耗系数来计算的。进一步地，平板太阳能集热器的能量效率、熵产生、火用破坏和火用效率也被确定为上述两者的总损耗系数。与早期文献中的实验测量相比，所提出模型的火用效率翻了一番。此外，比较所提出的方法，