c语言调用refprop

要在C语言中调用refprop，需要使用Refprop-Library库。这个库提供了一组C语言封装器，可以让你在C语言中方便地调用refprop。下面是一个简单的例子，演示了如何使用Refprop-Library库来计算氢气的热力学性质：

#include "REFPROP_lib.h"
#include <stdio.h>

int main()
{
    // 初始化 Refprop
    SETUPdll("H2", "DEF", "HMX.BNC", "HMX.DAT");

    // 计算氢气的热力学性质
    double temperature = 298.15; // 温度
    double pressure = 101325.0;  // 压力

    // 调用 Refprop 计算函数
    double density = rhomol_(&temperature, &pressure);
    double enthalpy = hmol_(&temperature, &pressure);
    double entropy = smol_(&temperature, &pressure);
    double internal_energy = umol_(&temperature, &pressure);
    double helmholtz_energy = aresmol_(&temperature, &pressure);
    double gibbs_energy = gtmol_(&temperature, &pressure);
    double heat_capacity_cp = cpmol_(&temperature, &pressure);
    double heat_capacity_cv = cvmol_(&temperature, &pressure);
    double speed_of_sound = wmol_(&temperature, &pressure);

    // 输出结果
    printf("Density: %f kg/m^3\n", density);
    printf("Enthalpy: %f J/kg\n", enthalpy);
    printf("Entropy: %f J/(kg*K)\n", entropy);
    printf("Internal Energy: %f J/kg\n", internal_energy);
    printf("Helmholtz Energy: %f J/kg\n", helmholtz_energy);
    printf("Gibbs Energy: %f J/kg\n", gibbs_energy);
    printf("Heat Capacity (Cp): %f J/(kg*K)\n", heat_capacity_cp);
    printf("Heat Capacity (Cv): %f J/(kg*K)\n", heat_capacity_cv);
    printf("Speed of Sound: %f m/s\n", speed_of_sound);

    // 关闭 Refprop
    QUITdll();

    return 0;
}

这里我们假设refprop已经安装在当前目录下，数据文件在 "HMX.BNC" 和 "HMX.DAT" 中。注意，你需要先从NIST官网下载refprop二进制文件，并安装到你的计算机上，才能使用Refprop-Library库。