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首页> 外文期刊>Journal of Energy Storage >Applicability of the local thermal equilibrium assumption in the performance modelling of CSP plant rock bed thermal energy storage systems
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Applicability of the local thermal equilibrium assumption in the performance modelling of CSP plant rock bed thermal energy storage systems

机译：局部热平衡假设在CSP厂岩床储热系统性能建模中的适用性

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Gas-solid packed beds have been widely studied as a cost-effective means of thermal energy storage in concentrating solar power (CSP) plants. Typically, the operation of packed beds in such systems is modelled by accounting for a finite rate of heat transfer between the fluid and solid media. This approach requires the coupled solution of the fluid- and solid-phase energy equations, which is computationally-costly, especially for year-long performance simulations. The local thermal equilibrium assumption, which assumes an infinite inter-phase heat transfer rate, can be applied to reduce the complexity and thus computational cost of packed bed models. However, the implications of making such an assumption in the context of CSP thermal energy storage system performance modelling is poorly understood. In fact, the application of the approach in long-term simulations has not been investigated before. This work addresses the topic by comparatively evaluating the performance of local thermal equilibrium and local thermal non-equilibrium models in the annual simulation of an air-rock packed bed, hypothetically operating in an open volumetric receiver CSP plant. The level of inter-model agreement is assessed in terms of annual bed exergy yield, bed blowing work, and plant power generation time. In addition, solution times are compared to establish the extent of computational cost savings. A parametric study examining the effect of variations in key bed design parameters on inter-model agreement is also conducted. The results obtained provide a clear indication of the strengths and weaknesses of either modelling approach, as well as of the suitability of the local thermal equilibrium assumption in general.
机译：气固填充床已被广泛研究为聚光太阳能（CSP）电厂中一种经济高效的热能存储方式。通常，通过考虑流体和固体介质之间有限的热传递速率来模拟这种系统中填充床的运行。这种方法需要流体和固相能量方程的耦合解，这在计算上是昂贵的，特别是对于长达一年的性能仿真而言。可以采用假定相间传热速率为无限的局部热平衡假设，以降低填充床模型的复杂度并因此降低其计算成本。但是，在CSP热能存储系统性能建模的背景下做出这样的假设的含义了解得很少。实际上，该方法在长期仿真中的应用尚未进行过研究。这项工作通过在气浮床的年度模拟中比较评估局部热平衡和局部热非平衡模型的性能来解决这个问题，假设该模型在开放式容积式接收器CSP工厂中运行。模型间协议的级别是根据每年的床可用火产量，吹气工作和电厂发电时间来评估的。另外，比较解决方案时间以建立节省计算成本的程度。还进行了一项参数研究，研究了关键床设计参数的变化对模型间一致性的影响。获得的结果清楚地表明了这两种建模方法的优缺点，以及一般而言局部热平衡假设的适用性。

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