软件简介

Freesteam是一个库，让您使用业界标准IAPWS - IF97计算水和水蒸汽性质蒸汽表。这是C + +类库，可到您的代码中。插件允许
freesteam能与电子表格和其他应用的集成正在开发中。所包含的单元测试确保与出版属性值的情况。 IAPWS -
95（科学使用）的相关性也包括在内，并作为此验证的一部分使用。

示例代码：

#include <freesteam/steam_ps.h>  
#include <freesteam/steam_pT.h>  
#include <freesteam/region4.h>  
#include <stdio.h>

int main(void){

    fprintf(stderr,"\nThis example demonstrates use of a few of the basic"  
        " capabilities of freesteam. It calculates the rise in temperature"  
        " seen in isentropic compression of a sample of steam initially at"  
        " 1 bar, 400 K, to a final pressure of 10 bar. It also calculates"  
        " the saturation temperature for steam at that final pressure.\n\n"  
    );

    double T = 400.; /* in Kelvin! */  
    double p = 1e5; /* = 1 bar */

    fprintf(stderr,"Initial temperature = %f K, pressure = %f bar\n", T, p/1e5);

    /* set a steam state of 1 bar, 400 K */  
    SteamState S = freesteam_set_pT(1e5, 400);

    double s = freesteam_s(S);  
    fprintf(stderr,"Entropy at initial state is %f kJ/kgK\n",s/1e3);

    /* calculate a steam state with entropy from above and 10 bar pressure */  
    SteamState S2 = freesteam_set_ps(10e5, s);

    double T2 = freesteam_T(S2);  
    double p2 = freesteam_p(S2);

    /* output the new temperature */  
    fprintf(stderr,"New temperature is %f K at %f bar\n", T2, p2/1e5);

    fprintf(stderr,"Check: final entropy is %f kJ/kgK\n", freesteam_s(S2)/1e3);

    /* saturation temperature at final pressure */  
    double Tsat = freesteam_region4_Tsat_p(p2);  
    fprintf(stderr,"Saturation temperature at %f bar is %f K.\n\n",p2/1e5, Tsat);

    return 0;  
}