Abstract

In present paper, thermodynamic analysis and techno-economic assessment of an organic Rankine cycle (ORC) coupled with solar parabolic trough collector (PTC) are investigated. The thermodynamic and economic models, based on the principles of thermodynamics and heat transfer, as well as dynamic economic analysis, are developed for the components of the combined system. By performing a parametric study, the effects of outlet temperature (T_PTC,out) and temperature difference between inlet and outlet of PTC (ΔT) and pinch point temperature difference of heat exchangers on the thermo-economic performance are evaluated. Moreover, under reasonable thermodynamic boundary conditions, the optimal operational parameters are obtained via a Pareto frontier solution. It is indicated that the improving T_PTC,out is beneficial to the thermo-economic performance. Among the fluid candidates, toluene yields the best energy, exergetic and economic performance. There exists an optimal ΔT at which the thermal and exergy efficiency achieve the maximum. The optimal ΔT is 19–26°C for the screened working fluids. The pinch point temperature difference of evaporator has different impact on the system performance compared with that of condenser. The evaporator pinch point temperature difference has slight influence on the economic performance when it is larger than 10°C. While there is optimized condenser pinch point temperature difference (7–8°C), the economic performance is the optimal. The PTC and heat exchanger are the main source of total investment cost, account for more than 75%. The Pareto frontier solutions can provide a design guide for the decision maker.

中文翻译：

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太阳能抛物槽集热器驱动的高温有机朗肯循环性能特点及工质选择

摘要

在本文中，研究了有机朗肯循环（ORC）与太阳能抛物槽收集器（PTC）的热力学分析和技术经济评估。基于热力学和传热原理以及动态经济分析的热力学和经济模型是针对组合系统的组件开发的。通过执行参数研究，出口温度 ( T _PTC,out ) 和 PTC 入口和出口之间的温差 (Δ T) 和夹点温度差对换热器的热经济性能进行了评价。此外，在合理的热力学边界条件下，通过帕累托前沿解获得最优运行参数。表明提高T _PTC,out有利于热经济性能。在流体候选者中，甲苯产生最好的能量、能量和经济性能。存在一个最佳ΔT，在​​该ΔT处热效率和火用效率达到最大值。最优ΔT筛选的工作流体的温度为 19–26°C。与冷凝器相比，蒸发器的夹点温差对系统性能的影响不同。蒸发器夹点温差大于10℃时对经济性能影响不大。虽然冷凝器夹点温度差（7–8°C）得到优化，但经济性能是最佳的。PTC和换热器是总投资成本的主要来源，占75%以上。帕累托前沿解决方案可以为决策者提供设计指南。