Fortran
program example_in_f
use stdlib_kinds, only: dp, int32
use iapws
implicit none
integer(int32) :: i, ngas
real(dp) :: T(1), kh_res(1), kd_res(1)
real(dp) :: Ts(7), ps(7)
character(len=2) :: gas = "O2"
integer(int32) :: heavywater = 0
type(gas_type), pointer :: gases_list(:)
character(len=:), pointer :: gases_str
print *, '########################## IAPWS VERSION ##########################'
print *, "version ", get_version()
print *, '########################## IAPWS R2-83 ##########################'
print "(a, f10.3, a)", "Tc in h2o=", Tc_H2O, " k"
print "(a, f10.3, a)", "pc in h2o=", pc_H2O, " mpa"
print "(a, f10.3, a)", "rhoc in h2o=", rhoc_H2O, " kg/m3"
print "(a, f10.3, a)", "Tc in D2O=", Tc_D2O, " k"
print "(a, f10.3, a)", "pc in D2O=", pc_D2O, " mpa"
print "(a, f10.3, a)", "rhoc in D2O=", rhoc_D2O, " kg/m3"
print *, ''
print *, '########################## IAPWS G7-04 ##########################'
! Compute kh and kd in H2O
T(1) = 25.0_dp + 273.15_dp
call kh(T, gas, heavywater, kh_res)
print "(A10, 1X, A10, 1X, A2, F10.1, A, 4X, A3, SP, F10.4)", "Gas=", gas, "T=", T, "K", "kh=", kh_res
call kd(T, gas, heavywater, kd_res)
print "(A10, 1X, A10, 1X, A2, F10.1, A, 4X, A3, SP, F15.4)", "Gas=", gas, "T=", T, "K", "kh=", kd_res
! Get and print available gases
heavywater = 0
ngas = ngases(heavywater)
gases_list => null()
gases_list => gases(heavywater)
gases_str => gases2(heavywater)
print *, "Gases in H2O: ", ngas
print *, gases_str
do i=1, ngas
print *, gases_list(i)%gas
enddo
heavywater = 1
ngas = ngases(heavywater)
gases_list => null()
gases_list => gases(heavywater)
gases_str => gases2(heavywater)
print *, "Gases in D2O: ", ngas
print *, gases_str
do i=1, ngas
print *, gases_list(i)%gas
enddo
print *, '########################## IAPWS R7-97 ##########################'
! Compute ps from Ts.
Ts(:) = [-1.0_dp, 25.0_dp, 100.0_dp, 200.0_dp, 300.0_dp, 360.0_dp, 374.0_dp]
Ts(:) = Ts(:) + 273.15_dp
call psat(Ts, ps)
do i=1, size(Ts)
print "(SP, F23.3, A3, 4X, F23.3, A3)", Ts(i), "K", ps(i), "MPa"
end do
! Compute Ts from ps
call Tsat(ps, Ts)
do i=1, size(Ts)
print "(SP, F23.3, A3, 4X, F23.3, A3)", Ts(i), "K", ps(i), "MPa"
end do
end program
C
#include <string.h>
#include <stdio.h>
#include "iapws.h"
int main(void){
double T = 25.0 + 273.15; /* in C*/
char *gas = "O2";
double kh, kd;
char **gases_list;
char *gases_str;
int ngas;
int i;
int heavywater = 0;
printf("%s\n", "########################## IAPWS VERSION ##########################");
printf("version %s\n", iapws_get_version());
printf("%s\n", "########################## IAPWS R2-83 ##########################");
printf("%s %10.3f %s\n", "Tc in H2O", iapws_r283_Tc_H2O, "K");
printf("%s %10.3f %s\n", "pc in H2O", iapws_r283_pc_H2O, "MPa");
printf("%s %10.3f %s\n", "rhoc in H2O", iapws_r283_rhoc_H2O, "kg/m3");
printf("%s %10.3f %s\n", "Tc in D2O", iapws_r283_Tc_D2O, "K");
printf("%s %10.3f %s\n", "pc in D2O", iapws_r283_pc_D2O, "MPa");
printf("%s %10.3f %s\n", "rhoc in D2O", iapws_r283_rhoc_D2O, "kg/m3");
printf("\n");
printf("%s\n", "########################## IAPWS G7-04 ##########################");
/* Compute kh and kd in H2O*/
iapws_g704_kh(&T, gas, heavywater, &kh, strlen(gas), 1);
printf("Gas=%s\tT=%fK\tkh=%+10.4f\n", gas, T, kh);
iapws_g704_kd(&T, gas, heavywater, &kd, strlen(gas), 1);
printf("Gas=%s\tT=%fK\tkd=%+15.4f\n", gas, T, kd);
/* Get and print the available gases */
ngas = iapws_g704_ngases(heavywater);
gases_list = iapws_g704_gases(heavywater);
gases_str = iapws_g704_gases2(heavywater);
printf("Gases in H2O: %d\n", ngas);
printf("%s\n", gases_str);
for(i=0; i<ngas; i++){
printf("%s\n", gases_list[i]);
}
heavywater = 1;
ngas = iapws_g704_ngases(heavywater);
gases_list = iapws_g704_gases(heavywater);
gases_str = iapws_g704_gases2(heavywater);
printf("Gases in D2O: %d\n", ngas);
printf("%s\n", gases_str);
for(i=0; i<ngas; i++){
printf("%s\n", gases_list[i]);
}
printf("%s\n", "########################## IAPWS R7-97 ##########################");
double Ts[7] = {-1.0, 25.0, 100.0, 200.0, 300.0, 360.0, 374.0};
double ps[7] = {1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0};
for(i=0; i<7; i++){
Ts[i] = Ts[i] + 273.15;
}
iapws_r797_psat(7, Ts, ps);
for(i=0; i<7; i++){
printf("%+23.3f %s %+23.3f %s\n", Ts[i], "K", ps[i], "MPa");
}
iapws_r797_Tsat(7, ps, Ts);
for(i=0; i<7; i++){
printf("%+23.3f %s %+23.3f %s\n", Ts[i], "K", ps[i], "MPa");
}
return 0;
}
Python
r"""Example in python"""
import sys
sys.path.insert(0, "../py/src/")
import array
import numpy as np
import matplotlib.pyplot as plt
import pyiapws
print("########################## IAPWS VERSION ##########################")
print(pyiapws.__version__)
print("########################## IAPWS R2-83 ##########################")
print("Tc in H2O", pyiapws.r283.Tc_H2O, "K")
print("pc in H2O", pyiapws.r283.pc_H2O, "MPa")
print("rhoc in H2O", pyiapws.r283.rhoc_H2O, "kg/m3")
print("Tc in D2O", pyiapws.r283.Tc_D2O, "K")
print("pc in D2O", pyiapws.r283.pc_D2O, "MPa")
print("rhoc in D2O", pyiapws.r283.rhoc_D2O, "kg/m3")
print("")
print("########################## IAPWS G7-04 ##########################")
gas = "O2"
T = array.array("d", (25.0+273.15,))
# Compute kh and kd in H2O
heavywater = False
k = pyiapws.g704.kh(T, "O2", heavywater)
print(f"Gas={gas}\tT={T[0]}K\tkh={k[0]:+10.4f}\n")
k = pyiapws.g704.kd(T, "O2", heavywater)
print(f"Gas={gas}\tT={T[0]}K\tkd={k[0]:+10.4f}\n")
# Get and print the available gases
heavywater = False
gases_list = pyiapws.g704.gases(heavywater)
gases_str = pyiapws.g704.gases2(heavywater)
ngas = pyiapws.g704.ngases(heavywater)
print(f"Gases in H2O: {ngas:}")
print(gases_str)
for gas in gases_list:
print(gas)
heavywater = True
gases_list = pyiapws.g704.gases(heavywater)
gases_str = pyiapws.g704.gases2(heavywater)
ngas = pyiapws.g704.ngases(heavywater)
print(f"Gases in D2O: {ngas:}")
print(gases_str)
for gas in gases_list:
print(gas)
style = {"marker":".", "ls":"", "ms":2}
T_KELVIN = 273.15
T = np.linspace(0.0, 360.0, 1000) + 273.15
solvent = {True: "D2O", False: "H2O"}
print("Generating plot for kh")
kname = "kh"
for HEAVYWATER in (False, True):
print(solvent[HEAVYWATER])
fig = plt.figure()
ax = fig.add_subplot()
ax.grid(visible=True, ls=':')
ax.set_xlabel("T /°C")
ax.set_ylabel("ln (kh/1GPa)")
gases = pyiapws.g704.gases(HEAVYWATER)
for gas in gases:
k = pyiapws.g704.kh(T, gas, HEAVYWATER) / 1000.0
ln_k = np.log(k)
ax.plot(T, ln_k, label=gas, **style)
ax.legend(ncol=3)
fig.savefig(f"../media/g704-{kname:s}_{solvent[HEAVYWATER]}.png", dpi=100, format="png")
print("Generating plot for kd")
kname = "kd"
for HEAVYWATER in (False, True):
print(solvent[HEAVYWATER])
fig = plt.figure()
ax = fig.add_subplot()
ax.grid(visible=True, ls=':')
ax.set_xlabel("T /°C")
ax.set_ylabel("ln kd")
gases = pyiapws.g704.gases(HEAVYWATER)
for gas in gases:
k = pyiapws.g704.kd(T, gas, HEAVYWATER)
ln_k = np.log(k)
ax.plot(T, ln_k, label=gas, **style)
ax.legend(ncol=3)
fig.savefig(f"../media/g704-{kname:s}_{solvent[HEAVYWATER]}.png", dpi=100, format="png")
print("########################## IAPWS R7-97 ##########################")
Ts = np.asarray([-1.0, 25.0, 100.0, 200.0, 300.0, 360.0, 374.0])
Ts = Ts + 273.15
ps = pyiapws.r797.psat(Ts)
for i in range(Ts.size):
print(f"{Ts[i]:23.3f} K {ps[i]:23.3f} MPa.")
Ts = pyiapws.r797.Tsat(ps)
for i in range(Ts.size):
print(f"{Ts[i]:23.3f} K {ps[i]:23.3f} MPa.")
fig = plt.figure()
ax = fig.add_subplot()
ax.grid(visible=True, ls=':')
ax.set_xlabel("Ts /K")
ax.set_ylabel("ps /MPa")
Ts = np.linspace(0.0, 370.0, 500)
Ts = Ts + 273.15
ps = pyiapws.r797.psat(Ts)
ax.plot(Ts, ps, "r-", label="ps(Ts)")
Ts = pyiapws.r797.Tsat(ps)
ax.plot(Ts, ps, "b--", label="Ts(ps)")
ax.legend()
fig.savefig(f"../media/r797-r4.png", dpi=100, format="png")
plt.show()