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Validation of a CFD model simulating charge and discharge of a small heat storage test module based on a sodium acetate water mixture

机译:验证CFD模型,模拟基于醋酸钠水混合物的小型蓄热测试模块的充电和放电

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摘要

Experimental and theoretical investigations are carried out to study the heating of a 302 x 302 x 55 mm test box of steel containing a sodium acetate water mixture. A thermostatic bath has been set up to control the charging and discharging of the steel box. The charging and discharging has been investigated experimentally by measuring surface temperatures of the box as well as the internal temperature of the sodium acetate water mixture through a probe located in the center of the steel box. The temperature developments on the outer surfaces of the steel box are used as input parameters for a Computational Fluid Dynamics (CFD) model. The CFD calculated temperatures are compared to measured temperatures internally in the box to validate the CFD model. Four cases are investigated; heating the test module with the sodium acetate water mixture in solid phase from ambient temperature to 52˚C; heating the module starting with the salt water mixture in liquid phase from 72˚C to 95˚C; heating up the module from ambient temperature with the salt water mixture in solid phase, going through melting, ending in liquid phase at 78˚C/82˚C; and discharging the test module from liquid phase at 82˚C, going through the crystallization, ending at ambient temperature with the sodium acetate water mixture in solid phase. Comparisons have shown reasonable good agreement between experimental measurements and theoretical simulation results for the investigated scenarios.
机译:进行了实验和理论研究,以研究装有乙酸钠水混合物的302 x 302 x 55 mm钢测试箱的加热情况。设置了恒温槽以控制钢箱的装卸。通过测量位于钢制箱体中心的箱子的表面温度以及醋酸钠水混合物的内部温度,通过实验研究了充放电。钢箱外表面的温度变化用作计算流体动力学(CFD)模型的输入参数。将CFD计算的温度与框中的内部测量温度进行比较,以验证CFD模型。调查了四起案件;用固相的乙酸钠水混合物将测试模块从环境温度加热到52˚C;从液态的盐水混合物开始将模块从72°C加热到95°C;用固相的盐水混合物将模块从环境温度加热,使其熔融,最后在78˚C/82˚C的液相中终止;然后从82°C的液相中取出测试模块,进行结晶,并在室温下以固相的乙酸钠水混合物结束。比较表明,对于所研究的场景,实验测量值与理论模拟结果之间存在合理的良好一致性。

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