This study presents a combined experimental and numerical investigation of the performance of a new modular sensible heat storage system with a cement based, water saturated, porous storage matrix and a helical tubular heat exchanger during cyclic storage operation. To characterize the storage system with respect to achievable storage rates and storage capacity, two sets of dedicated and highly controlled dynamic charging-discharging cycles were experimentally conducted using a one cubic meter lab-scale storage unit prototype. A prognostic process based and high resolution 3D finite element model for this storage unit was developed, tested and validated by comparison to the experimental data. The overall model agreement with the experimental data is excellent, also for extended cyclic storage operations using up to nine charging-discharging cycles, with root mean square errors of temperatures within the storage unit smaller than 1.3°C, heat balances within 3 % of the experimental value and an average Nash Sutcliffe model efficiency index as high as 0.993. The numerical model could thus be used for application specific, simulation based storage design and dimensioning by simulating storage performance for modified heat exchanger geometries, component materials and operational boundary conditions. The simulation results indicate, that the heat transfer rate of the laboratory prototype can be increased by up to 150% for short-term (i.e. < 1h) and up to 90 % for mid-term (< 6h) charging durations, respectively, by employing an elevated charging temperature, increasing the thermal conductivity of the storage medium and heat exchanger pipe, and decreased heat exchanger coil pitch height. The corresponding achievable short- and mid-term charging capacities can thus be improved by about 170 and 130 %.

这项研究提出了一个新的组合式显热存储系统的性能的实验和数值研究，该系统具有基于水泥的，水饱和的多孔存储矩阵和螺旋管式热交换器，在循环存储过程中运行。为了针对可达到的存储速率和存储容量来表征存储系统，使用一立方米实验室规模的存储单元原型对两组专用且高度受控的动态充放电循环进行了实验。通过与实验数据进行比较，开发，测试和验证了该存储单元的基于预后过程的高分辨率3D有限元模型。总体模型与实验数据的一致性非常好，对于使用多达九个充放电循环的扩展循环存储操作，存储单元内温度的均方根误差小于1.3°C，热平衡在实验值的3％之内，平均Nash Sutcliffe模型效率指数高达0.993。因此，通过模拟修改后的热交换器的几何形状，部件材料和操作边界条件的存储性能，该数值模型可用于特定用途的基于存储的设计和尺寸确定。仿真结果表明，短期（即<1h）和中期（<6h）充电持续时间，实验室原型的传热速率可以分别提高150％和90％。使用升高的充电温度，增加了存储介质和热交换器管道的热导率，并减小了热交换器盘管的螺距高度。