Thermal energy storage is gaining attention due to the rapid development of renewable energy. Among various systems, ammonia-based sorption energy storage offers high heat storage density and low heat loss, promising a great potential. However, the poor thermal conductivity of metal chloride-NH reactors poses significant challenges, necessitating the optimization of reactor design to improve heat transfer performance. Incorporating appropriate fins is a validated effective method, but comprehensive comparisons of various structures for ammonia-based sorption, especially in 3D, are still deficient. Aiming at the research gap, this study focuses on conducting numerical analyses on various 3D fin types (circular, longitudinal, and trapezoidal) within the reactor employing SrCl-NH as the working pair. Results indicate that incorporating fins could effectively enhance heat transfer rates and reaction kinetics, resulting in a reduction of the average maximum sorption temperature rise by 6.89 K with trapezoidal fins. Parametric studies are then performed to optimize the fin structure further. The optimized fins demonstrate a 2.97 % increase in average output power when compared to the initial reactor design with trapezoidal fins. These findings suggest that the proposed reactor design holds significant promise for advancing thermodynamic devices in ammonia-based sorption heat storage.

中文翻译：

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氨热化学吸附储能翅片反应器结构的三维数值研究


由于可再生能源的快速发展，热能存储越来越受到人们的关注。在各种系统中，氨基吸附储能具有较高的储热密度和较低的热损失，具有巨大的潜力。然而，金属氯化物-NH反应器的导热性差带来了重大挑战，需要优化反应器设计以提高传热性能。采用适当的翅片是一种经过验证的有效方法，但对氨基吸附的各种结构的综合比较，特别是在 3D 方面，仍然存在缺陷。针对这一研究空白，本研究重点以 SrCl-NH 作为工作对，对反应器内各种 3D 翅片类型（圆形、纵向和梯形）进行数值分析。结果表明，加入翅片可以有效提高传热速率和反应动力学，导致梯形翅片的平均最大吸附温升降低 6.89 K。然后进行参数研究以进一步优化翅片结构。与采用梯形翅片的初始反应堆设计相比，优化后的翅片平均输出功率提高了 2.97%。这些发现表明，所提出的反应器设计对于推进基于氨的吸附热储存的热力学装置具有重大前景。