As a competitive new energy storage technology, the thermally integrated pumped thermal electricity storage (TI-PTES) system has received much attention. In this work, two TI-PTES systems are constructed: the RHP-BORC system, which consists of a heat pump cycle (HP) with a regenerator and a basic organic Rankine cycle (BORC), and the RHP-EOFC system, which consists of a HP with a regenerator and an organic flash cycle with ejectors. Meanwhile, R1233zd(E) and Cis-butene are selected to form R1233zd(E)/R1233zd(E) (denoting the working fluid used in the charge and discharge cycles, respectively), R1233zd(E)/Cis-butene, Cis-butene/Cis-butene, and Cis-butene/R1233zd(E) groups. Thermodynamic and economic analyses as well as multi-objective optimization are performed for both systems. The results indicate that for the two systems with different working fluid groups, different parameters have distinct effects on the system performance, and the thermodynamic and economic performance of the RHP-BORC system is better than those of the RHP-EOFC system. For the RHP-BORC system, with the variations of thermal storage temperature, evaporation temperature of heat pump and pinch point temperature difference, the values of different performance metrics of the system with different working fluid groups are close respectively, such as power-to-power efficiency, energy storage density and annual emission reduction. For the RHP-EOFC system under different parameter conditions, when the system uses R1233zd(E)/Cis-butene and Cis-butene/Cis-butene, the performance is better. From the results of the multi-objective optimization, the optimal working fluid group of the RHP-BORC and RHP-EOFC systems are Cis-butene/Cis-butene and R1233zd(E)/Cis-butene, and the values of the power-to-power efficiency and the levelized cost of storage under the optimal solution conditions are 75.76 %, 0.234 $·kWh, and 84.31 %, 0.227 $·kWh, respectively. The results of the exergy destruction analysis under the optimal solution conditions show that the largest exergy destruction in the RHP-BORC and RHP-EOFC systems are in the condenser (480 kW) and compressor (1275 kW) of the HP cycle. This work expands the configuration of the TI-PTES system, showing promising development prospects. It also provides theoretical support for the further advancement of the TI-PTES system and offers valuable guidance for the design of such systems.

中文翻译：

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使用不同工作流体组的两种热集成抽水蓄热系统的研究：性能比较


作为一种具有竞争力的新能源存储技术，热集成抽水蓄热电存储（TI-PTES）系统备受关注。在这项工作中，构建了两个 TI-PTES 系统：RHP-BORC 系统，由带有再生器的热泵循环 (HP) 和基本有机朗肯循环 (BORC) 组成，以及 RHP-EOFC 系统，由带有再生器和带有喷射器的有机闪蒸循环的 HP。同时，选择R1233zd(E)和Cis-丁烯形成R1233zd(E)/R1233zd(E)（分别表示充电和放电循环中使用的工作流体），R1233zd(E)/Cis-丁烯，Cis-丁烯/顺丁烯和顺丁烯/R1233zd(E)基团。对两个系统都进行了热力学和经济分析以及多目标优化。结果表明，对于不同工质组的两个系统，不同参数对系统性能的影响不同，RHP-BORC系统的热力性能和经济性能优于RHP-EOFC系统。对于RHP-BORC系统，随着蓄热温度、热泵蒸发温度和夹点温差的变化，不同工质组的系统的不同性能指标值分别接近，例如功率比电力效率、储能密度和年减排量。对于不同参数条件下的RHP-EOFC系统，当系统使用R1233zd(E)/顺丁烯和顺丁烯/顺丁烯时，性能较好。 从多目标优化结果来看，RHP-BORC和RHP-EOFC系统的最佳工质组为顺丁烯/顺丁烯和R1233zd(E)/顺丁烯，功率-最优方案条件下的发电效率和平准化储能成本分别为75.76%、0.234 $·kWh 和84.31%、0.227 $·kWh。最优解条件下的火用破坏分析结果表明，RHP-BORC和RHP-EOFC系统中火用破坏最大的是高压循环的冷凝器（480 kW）和压缩机（1275 kW）。这项工作扩展了TI-PTES系统的配置，显示出良好的发展前景。它还为TI-PTES系统的进一步发展提供了理论支持，并为此类系统的设计提供了有价值的指导。