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Enhanced performance and reduced payback period of a low grade geothermal-based ORC through employing two TEGs

机译：通过使用两个TEG，增强了低品位地热ORC的性能并缩短了投资回收期

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摘要

In this paper, a novel integrated system is proposed to improve the performance of a conventional low-grade geothermal-based organic Rankine cycle (ORC). The main idea is to utilize two TEG units to recover the waste heat of the condenser and geothermal brine. The proposed model is investigated and compared with simple ORC from the energy, exergy, and exergoeconomic viewpoints through the parametric study. Furthermore, the payback period of the systems is calculated to investigate the economic aspects of the model in more details. Results show that the exergy efficiency of the proposed system would be 56.81% at the base case (4.67% higher than the simple geothermal-based ORC system) and the total product cost of the proposed integrated system is 24.55 $/GJ at the base case (5.5% lower than simple ORC), while the payback period of the suggested system is 2.422 years (15 days lower than the simple ORC cycle). Furthermore, the net power output of the novel proposed system is 75.24 kW (9% higher than the simple ORC cycle). Comprehensive paramedic study and comparison of the exergy and exergoeconomic aspects reveal that the proposed system is a promising method to optimize such systems from exergy/exergoeconomic viewpoints.
机译：在本文中，提出了一种新颖的集成系统，以改善常规低等级地热基有机朗肯循环（ORC）的性能。主要思想是利用两个TEG装置回收冷凝器和地热盐水的废热。通过参数研究，从能量，火用和人类经济的角度对提出的模型进行了研究，并与简单的ORC进行了比较。此外，计算系统的投资回收期以更详细地研究模型的经济方面。结果表明，在基本情况下，拟议系统的火用效率为56.81％（比基于简单地热的ORC系统高4.67％），在基本情况下，拟议综合系统的总产品成本为24.55 $ / GJ （比简单ORC降低5.5％），而建议系统的投资回收期为2.422年（比简单ORC周期低15天）。此外，新提出的系统的净功率输出为75.24 kW（比简单的ORC周期高9％）。全面的护理人员研究以及对（火用）和（火用）经济方面的比较表明，从火用/（火用）经济角度出发，拟议的系统是优化此类系统的有前途的方法。

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