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首页> 外文期刊>International Journal of Heat and Mass Transfer >Simulation of thermocline storage for solar thermal power plants: From dimensionless results to prototypes and real-size tanks
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Simulation of thermocline storage for solar thermal power plants: From dimensionless results to prototypes and real-size tanks

机译：模拟太阳能热电厂的热跃层存储：从无量纲的结果到原型和实际尺寸的储罐

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A single-phase one-dimensional model called CIEMAT1D1SF has been developed for characterizing the behaviour of thermocline tanks with an effective storage medium formed by either a liquid or a liquid and a packed-bed. Despite its simplicity, this model has been validated with experimental data and the results of tank performance are similar to those obtained by other authors using more complex simulation models. In order to obtain general results the thermal equation has been nondimensionalized and the resulting expression only depends on the parameter called dimensionless velocity, υ*. It has been observed that thermocline thickness decreases as υ* increases attaining a minimum value when υ* ≥ 2350 while tank efficiency increases with υ* up to a maximum of about 87% also for υ* ≥ 2350. From these results the design equation for building thermocline storage tanks with maximum theoretical efficiency has been established. Since this design equation depends on tank dimensions and thermal power, small thermocline tanks and hence prototypes are not expected to behave in the same way as large or real-size tanks. Therefore maximum efficiency guideline plots for thermocline tanks with different storage media have been presented for various temperature intervals. In these plots thermal power has proven to be the critical design parameter because the larger the power the higher the degree of freedom for choosing tank dimensions and hence storage capacity and charging/discharging time. Therefore, we strongly recommend the use of these guideline plots in the design process of thermocline prototypes.
机译：已经开发出一种称为CIEMAT1D1SF的单相一维模型，用于表征具有有效液体（由液体或液体形成）和填充床的温跃层水箱的性能。尽管其简单性，该模型已通过实验数据进行了验证，并且储罐性能的结果与其他作者使用更复杂的仿真模型获得的结果相似。为了获得一般结果，对热方程进行了无量纲化，并且所得表达式仅取决于称为无量纲速度υ*的参数。已经观察到，当υ*≥2350时，随着υ*的增加而达到最小值，温床的厚度减小，而对于υ*≥2350的储罐效率也随着υ*的增加而增加，最大值也达到了约87％。已经建立了具有最大理论效率的热跃线储罐。由于此设计方程式取决于储罐尺寸和热功率，因此小型热跃层储罐和原型不希望与大型储罐或实际储罐具有相同的性能。因此，对于不同的温度间隔，已提出了具有不同存储介质的温跃层水箱的最大效率准则图。在这些图中，热功率已被证明是关键的设计参数，因为功率越大，选择水箱尺寸以及存储容量和充电/放电时间的自由度就越高。因此，我们强烈建议在温水线样机的设计过程中使用这些准则图。

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