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A simplified analytical approach for concrete sensible thermal energy storages simulation

机译:混凝土显热储能模拟的简化分析方法

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A simple lumped capacitance based computing model was developed and here presented. The code permits the thermal and energetic analysis of concrete thermal energy storages (TESs) during time. The simulated system consists of a parallelepiped concrete module that can be heated (charging phase) and cooled (discharging phase) by a single-phase working fluid flowing in a tube embedded in the concrete. The modules can be piled up in different configurations to build any desired TES. The new simulation code was validated against the experimental data carried out by ENEA with two different concrete mixtures, during both the heating and cooling processes using mineral oil as working fluid. Furthermore, on the basis of the energetic analysis, two different TES thermal efficiencies were proposed to evaluate the charge or discharge progresses over time. This simple and easy-to-use model allows for a drastic reduction of the computational time needed to simulate the TES and it can be easily integrated, in various arrangements, to any concentrated solar power plant (CSP) and associated energy conversion plant simulation models to have a quick evaluation of the whole system performance.
机译:一个简单的基于集总电容的计算模型已经开发出来,并在此提出。该规范允许在一段时间内对混凝土热能储存器(TES)进行热能分析。该模拟系统由平行六面体混凝土模块组成,该模块可以通过在嵌入混凝土的管中流动的单相工作流体进行加热(装料阶段)和冷却(排出阶段)。可以将模块堆叠为不同的配置,以构建任何所需的TES。在使用矿物油作为工作流体的加热和冷却过程中,使用两种不同的混凝土混合物对ENEA进行的实验数据验证了新的仿真代码。此外,在能量分析的基础上,提出了两种不同的TES热效率来评估随时间变化的充电或放电过程。这种简单易用的模型可以大大减少仿真TES所需的计算时间,并且可以轻松地以各种方式集成到任何集中式太阳能发电厂(CSP)和相关的能源转换厂仿真模型中快速评估整个系统的性能。

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