Techno-economic planning and construction of cost-effective large-scale hot water thermal energy storage for Renewable District heating systems
Techno-economic planning and construction of cost-effective large-scale hot water thermal energy storage for Renewable District heating systems
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DOI：
10.1016/j.renene.2019.11.017
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发表时间：
2020-05
期刊：
影响因子：
8.7
通讯作者：
F. Ochs;A. Dahash;A. Tosatto;Michele Bianchi Janetti
中科院分区：
文献类型：
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作者：
F. Ochs;A. Dahash;A. Tosatto;Michele Bianchi Janetti
季节性热能储存（TES）被设想为未来区域供热（DH）系统的主要参与者，其中大量可再生能源正在被整合。因此，为了完成季节性任务，这种存储系统具有大容量的特点。然而，这种大规模存储技术的集成并不容易规划和实现。为了获得最佳的TES集成规划解决方案，需要解决许多挑战，例如TES类型、体积和地面条件。考虑到它们的应用前景，这项工作的范围仅限于罐和坑的热能储存。因此，本文首先讨论了有限元工具中季节性TES的建模。然后，它检查了一系列参数的影响，即TES结构类型，几何形状，体积和DH特性，对TES性能的影响。随后，该工作开发了一种对此类技术进行施工技术经济分析的方法。结果表明，罐式TES的性能始终优于坑式TES，但另一方面也具有较高的资金成本。随着TES体积的增加，槽式和坑式之间的性能差异开始消失。此外，DH特征在TES性能中起着重要作用。它描述了降低DH温度将最终导致更低的TES热损失。另一个重要的发现是，建议的绩效指标适用于技术经济分析，因为它将技术资本成本与工商业污水附加费的有效量联系起来。该贡献还调查了绝缘水平对TES性能的影响，发现对于大于500,000 m3的体积，罐或坑之间没有主要的性能差异，如果绝缘包围TES信封。然而，也表明，当实现大体积时，绝缘只需要并且仅仅是为了保持地面质量。
Seasonal thermal energy storage (TES) is envisioned as a major player in the future district heating (DH) systems where large shares of renewables are being integrated. Therefore, in order to fulfill the seasonal tasks, such storage systems are characterized with large volumes. Yet, the integration of such large-scale storage technologies is not easily planned and realized. There exist numerous challenges e.g. TES type, volume and ground conditions, need to be tackled in order to obtain an optimal planning solution for TES integration. Given their promising applications, the scope of this work is limited to tank and pit thermal energy storage. Accordingly, this contribution firstly discusses the modeling of seasonal TES in finite element tools. Then, it examines the influence of a list of parameters i.e. TES construction type, geometry, volume and DH characteristics, on TES performance. Later, the work develops a methodology for construction techno-economic analysis of such technologies. It is revealed that the tank TES has always better performance than pit, but on the other hand it is always characterized with higher capital cost. As TES volume increases, the performance difference between tank and pit starts to vanish. Further, the DH characteristics play a major role in TES performance. It is depicted that lowering DH temperatures will ultimately lead to lower thermal losses from TES. Another important finding is the applicability of the suggested performance indicator for techno-economic analysis as it relates the technology capital cost to the effective volume of TES. The contribution also investigates the influence of insulation level on TES performance and it is found that for volumes larger than 500,000 m3, there is no major performance difference between the tank or the pit in case of insulation enclosing TES envelope. However, it is also revealed that insulation is needed only and solely to preserve the ground quality when large volumes are realized.