Reducing uncertainties in the numerical simulation of melting processes in phase change materials by a systematic model analysis using temperature dependent material properties

具有固/液相变的潜热储能（LTES）在低温差下储存热能是有吸引力的。越来越多的仿真方法被用于辅助这些存储器的设计。尽管一些底层模型很久以前就开发出来了，但它们仍然没有得到充分的验证。因此，在项目的头几年，对简单几何形状的熔化过程进行了详细的检查和验证。结果表明，热物理性质是造成数值结果与实验结果偏差的原因，而热物理性质在文献中差异很大。相比之下，使用平均温度相关的热物理性质导致数值和实验结果之间的一致性在5%到10%之间。由于这对于一个技术系统来说是足够的，我们将重点放在将结果转移到技术应用上。因此，本项目旨在通过实验和模拟来证明输入参数对这些存储设计的影响有多强。

Latent thermal energy storages (LTES) with solid/liquid phase change are attractive for storing thermal energy at low temperature differences. More and more simulations methods are used to assist in the design of these storages. Although some of the underlying models have been developed a long time ago, they are still insufficiently validated. Therefore, in the first years of the project, the melting process in a simple geometry was examined and validated in detail. It turned out that the thermophysical properties, which vary largely in the literature, were responsible for the deviation between numerical and experimental results. In contrast, the use of average temperature-dependent thermophysical properties led to an agreement within 5 to 10 % between numerical and experimental results. Since this is sufficient for a technical system, we focus on the transfer of the results to technical applications.Hence, this project aims to demonstrate through experiments and simulations how strongly the input parameters influence the design of these storages.