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Performance evaluation and parametric optimization strategy of a thermocapacitive heat engine to harvest low-grade heat

机译：热容式热机用于收集低级热量的性能评估和参数优化策略

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摘要

A novel Stirling-like irreversible electrochemical thermo-capacitive regenerative cycle operating between a heat reservoir and a heat sink for harvesting low-grade heat is proposed, in which the main irreversible losses are considered. Expressions for the efficiency and power output of the cycle are derived. The inherent regenerative heat loss of the cycle is revealed. The influences of several important parameters, such as the capacitance of the supercapacitor, charge ratio, endpoint voltage of the charging process on the power output of the cycle are discussed. The maximum power output and corresponding efficiency are calculated. The results show that when the charging endpoint voltage of the electrochemical thermo-capacitive regenerative cycle is 10 V, the maximum power output is 31.9 W and the efficiency at the maximum power output can reach 12.8%, which is 51.2% of the Carnot efficiency. The optimal values for several parameters at the maximum power output are determined. The parametric optimum selection criteria of the cycle are provided. The results obtained can ensure the cycle to operate in the optimum states.
机译：提出了一种新型的类斯特林不可逆电化学热容再生循环，该热循环在蓄热器和散热器之间工作以收集低级热量，其中考虑了主要不可逆损失。得出循环效率和功率输出的表达式。揭示了循环固有的再生热损失。讨论了几个重要参数的影响，例如超级电容器的电容，充电率，充电过程的终点电压对循环功率输出的影响。计算出最大功率输出和相应的效率。结果表明，当电化学热容再生循环的充电终点电压为10 V时，最大功率输出为31.9 W，最大功率输出时的效率可达到12.8％，是卡诺效率的51.2％。确定在最大功率输出下几个参数的最佳值。提供了循环的参数最优选择标准。获得的结果可以确保循环以最佳状态运行。

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