水和蒸汽拟临界温度的计算模型浅析

The Analysis of Calculation Model for the Pseudo Critical Temperature of Water and Steam

拟临界温度的大小,对于确定临界区域水的过热度具有重要意义。通常计算拟临界温度,需要多次循环迭代计算出最大比热从而得出拟临界温度。文章依据在各个压力下计算出的拟临界温度,运用最小二乘法,拟合得出了一种计算拟临界温度的计算方程。通过与迭代计算实际得到的拟临界温度相比较验证,计算误差完全在工程计算允许误差范围内。该计算方程形式简单,易于工程组态计算。

The value of the pseudo critical temperature for determining the degree of superheat of steam in critical region is important. Usually calculating the pseudo critical temperature requires multiple iteration to calculate the largest specific heat so as to get the pseudo critical temperature. Based on some pseudo critical temperature what are calculated using the iteration method and using the least square method, a calculation equation for calculating the pseudo critical temperature was determined. Compared the result with the actual pseudo critical temperature obtained by iteration calculating method, calculation deviation is entirely within the engineering calculation permissible deviation range. The form of this calculation equation is a simple,easy-to-engineering calculation.