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A New GP-evolved Formulation for the Relative Permittivity of Water and Steam

机译：一种新的GP演化配方，用于水和蒸汽的相对介电常数

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摘要

The relative permittivity (or static dielectric constant) of water and steam has been experimentally calculated at a relatively wide range of temperatures and pressures. A single function for predicting the relative permittivity of water and steam in three distinct thermodynamic regions is evolved using genetic programming. A data set comprised of all of the most accurate relative permittivity values, along with temperature, pressure, and density values from the entire experimentally calculated range of these values, found in [Fern95], is used for this task. The accuracy of this function is evaluated by comparing the values for the relative permittivity calculated using the evolved function and the values calculated using the latest formulation of Fernandez et al., found in [Fern97] to the aforementioned data set. In all regions, the newly evolved function outperforms the most current formulation in terms of difference between calculated and experimentally obtained values for the dielectric constant.
机译：水和蒸汽的相对介电常数（或静态介电常数）已经在相对宽的温度和压力范围内进行实验计算。使用遗传编程，演化了一种用于预测三个不同的热力学区域中水和蒸汽的相对介电常数的功能。由在[FERN95]中的整个实验计算的这些值的整个实验计算范围的温度，压力和浓度值以及来自它们的整个实验计算范围的所有最精确的相对介电常数值组成的数据集用于此任务。通过比较使用进化函数计算的相对介电常数的值和使用Fernandez等人的最新配方计算的值来评估该功能的准确性。在[FERN97]到上述数据集中。在所有区域中，新进化的功能在计算和实验获得的介电常数的值之间的差异方面优于最电流的制定。

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