Thermodynamic Analysis of High‐Temperature Energy Storage Concepts Based on Liquid Metal Technology,Energy Technology

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Thermodynamic Analysis of High‐Temperature Energy Storage Concepts Based on Liquid Metal Technology
Energy Technology ( IF 3.6 ) Pub Date : 2019-11-08 , DOI: 10.1002/ente.201900908
Tim Laube ₁ , Luca Marocco ₂ , Klarissa Niedermeier ₁ , Julio Pacio ₁ , Thomas Wetzel ₁

Affiliation

Within the thermal energy storage (TES) initiative NAtional Demonstrator for IseNtropic Energy storage (NADINE), three projects have been conducted, each focusing on TES at different temperature levels. Herein, technical concepts for using liquid metal technology in innovative high‐temperature TES systems are dealt with. This approach implies some challenges; first, the unit costs are relatively large which makes a reduction of the mass inventory necessary. Second, the high thermal diffusivity, which is beneficial in any heat exchanger unit, reduces the efficiency in a single‐tank TES due to the fast degradation of the thermocline. These limitations can be overcome using a nonexpensive solid filler material, and, if properly designed, similar performance as in state‐of‐the‐art molten salt systems can be obtained, while maintaining the advantage of operating at temperatures well beyond their upper limit. Optimization strategies are presented for a reference case including transient behavior of the whole system. The sensitivity of multiple parameters, e.g., porosity, particle size, and influence of storage capacity regarding the discharge efficiency, is investigated.

中文翻译：

基于液态金属技术的高温储能概念的热力学分析

在热能存储（TES）计划中，国际正能量存储国家演示器（NADINE）开展了三个项目，每个项目都针对不同温度水平的TES。本文讨论了在创新的高温TES系统中使用液态金属技术的技术概念。这种方法意味着一些挑战。首先，单位成本相对较大，因此有必要减少大量库存。其次，由于热跃层的快速降解，高热扩散率（在任何换热器单元中都是有益的）降低了单槽TES中的效率。使用廉价的固体填充材料可以克服这些局限性，如果设计合理，可以获得与最新熔融盐系统类似的性能，同时保持在远高于其上限的温度下运行的优势。针对参考案例（包括整个系统的瞬态行为）提出了优化策略。研究了多个参数的敏感性，例如，孔隙率，粒度和存储容量对放电效率的影响。

更新日期：2019-11-08

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