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首页> 外文期刊>Energy Conversion & Management >Thermodynamic analysis of a novel pumped thermal energy storage system utilizing ambient thermal energy and LNG cold energy
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Thermodynamic analysis of a novel pumped thermal energy storage system utilizing ambient thermal energy and LNG cold energy

机译：利用环境热能和LNG冷能的新型抽水式蓄热系统的热力学分析

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Pumped thermal energy storage (PTES) has become a hot topic on large scale energy storage technology because of the independence on geological conditions and fossil fuels. However, few of the PTES systems have higher round trip efficiencies compared with that of pumped hydro storage except for systems utilizing external heat sources. Furthermore, the used external heat sources are not available everywhere and much additional cost is required for the system integration. As an accessible and cheap heat source, ambient thermal energy is employed in the newly proposed PTES system. LNG (liquid natural gas) cold energy is also used as the heat sink based on possible combination with the natural gas distribution system in the practical operation. The charge process is based on transcritical CO2 heat pump cycle, while cascade design of transcritical CO2 Rankine cycle and subcritical NH3 Rankine cycle is employed in the discharge process. A thermodynamic model is established for energy and exergy analysis as well as the system evaluation. The analysis and evaluation of the optimized baseline case obtained by Genetic Algorithm are then carried out. In addition, the sensitivity of system performance to different variable parameters is also analyzed. Based on the analysis of optimized baseline case, the round trip efficiency can reach 139%. If for 1 MW net power output, both of the mass flow rates of CO2 and NH3 are 7.4 kg/s with LNG mass flow rate of 14.8 kg/s. Because of much higher round trip efficiency compared with other large scale energy storage systems, the proposed system is promising for future development and applications. (C) 2017 Elsevier Ltd. All rights reserved.
机译：由于地质条件和化石燃料的独立性，抽水式热能存储（PTES）已成为大规模储能技术的热门话题。但是，除利用外部热源的系统外，几乎没有其他PTES系统具有比抽水蓄能系统更高的往返效率。此外，所用的外部热源并非随处可用，并且系统集成需要很多额外的成本。作为一种可获取且便宜的热源，环境热能被用于新提出的PTES系统中。由于在实际操作中可能与天然气分配系统结合使用，因此LNG（液态天然气）冷能也被用作散热器。装料过程基于跨临界CO2热泵循环，而放电过程采用跨临界CO2兰金循环和亚临界NH3兰金循环的级联设计。建立了一个热力学模型用于能量和火用分析以及系统评估。然后对通过遗传算法获得的优化基准案例进行分析和评估。此外，还分析了系统性能对不同可变参数的敏感性。根据优化基准案例的分析，往返效率可以达到139％。如果净输出功率为1 MW，则CO2和NH3的质量流量均为7.4 kg / s，LNG质量流量为14.8 kg / s。由于与其他大型储能系统相比，往返效率更高，因此该系统有望在未来的开发和应用中发挥作用。 （C）2017 Elsevier Ltd.保留所有权利。

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