WaterSSTP.cpp

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/**
 *  @file WaterSSTP.cpp
 * Definitions for a ThermoPhase class consisting of pure water (see \ref thermoprops
 * and class \link Cantera::WaterSSTP WaterSSTP\endlink).
 */

// This file is part of Cantera. See License.txt in the top-level directory or
// at http://www.cantera.org/license.txt for license and copyright information.

#include "cantera/thermo/WaterSSTP.h"
#include "cantera/thermo/ThermoFactory.h"
#include "cantera/base/stringUtils.h"

using namespace std;

namespace Cantera
{
WaterSSTP::WaterSSTP() :
    m_mw(0.0),
    EW_Offset(0.0),
    SW_Offset(0.0),
    m_ready(false),
    m_allowGasPhase(false)
{
}

WaterSSTP::WaterSSTP(const std::string& inputFile, const std::string& id) :
    m_mw(0.0),
    EW_Offset(0.0),
    SW_Offset(0.0),
    m_ready(false),
    m_allowGasPhase(false)
{
    initThermoFile(inputFile, id);
}

WaterSSTP::WaterSSTP(XML_Node& phaseRoot, const std::string& id) :
    m_mw(0.0),
    EW_Offset(0.0),
    SW_Offset(0.0),
    m_ready(false),
    m_allowGasPhase(false)
{
    importPhase(phaseRoot, this);
}

void WaterSSTP::initThermo()
{
    SingleSpeciesTP::initThermo();

    // Calculate the molecular weight. Note while there may be a very good
    // calculated weight in the steam table class, using this weight may lead to
    // codes exhibiting mass loss issues. We need to grab the elemental atomic
    // weights used in the Element class and calculate a consistent H2O
    // molecular weight based on that.
    size_t nH = elementIndex("H");
    if (nH == npos) {
        throw CanteraError("WaterSSTP::initThermo",
                           "H not an element");
    }
    double mw_H = atomicWeight(nH);
    size_t nO = elementIndex("O");
    if (nO == npos) {
        throw CanteraError("WaterSSTP::initThermo",
                           "O not an element");
    }
    double mw_O = atomicWeight(nO);
    m_mw = 2.0 * mw_H + mw_O;
    setMolecularWeight(0,m_mw);
    double one = 1.0;
    setMoleFractions(&one);

    // Set the baseline
    doublereal T = 298.15;
    Phase::setDensity(7.0E-8);
    Phase::setTemperature(T);

    doublereal presLow = 1.0E-2;
    doublereal oneBar = 1.0E5;
    doublereal dd = m_sub.density(T, presLow, WATER_GAS, 7.0E-8);
    setDensity(dd);
    setTemperature(T);
    SW_Offset = 0.0;
    doublereal s = entropy_mole();
    s -= GasConstant * log(oneBar/presLow);
    if (s != 188.835E3) {
        SW_Offset = 188.835E3 - s;
    }
    s = entropy_mole();
    s -= GasConstant * log(oneBar/presLow);

    doublereal h = enthalpy_mole();
    if (h != -241.826E6) {
        EW_Offset = -241.826E6 - h;
    }
    h = enthalpy_mole();

    // Set the initial state of the system to 298.15 K and 1 bar.
    setTemperature(298.15);
    double rho0 = m_sub.density(298.15, OneAtm, WATER_LIQUID);
    setDensity(rho0);

    m_waterProps.reset(new WaterProps(&m_sub));

    // Set the flag to say we are ready to calculate stuff
    m_ready = true;
}

void WaterSSTP::setParametersFromXML(const XML_Node& eosdata)
{
    eosdata._require("model","PureLiquidWater");
}

void WaterSSTP::getEnthalpy_RT(doublereal* hrt) const
{
    *hrt = (m_sub.enthalpy() + EW_Offset) / RT();
}

void WaterSSTP::getIntEnergy_RT(doublereal* ubar) const
{
    *ubar = (m_sub.intEnergy() + EW_Offset)/GasConstant;
}

void WaterSSTP::getEntropy_R(doublereal* sr) const
{
    sr[0] = (m_sub.entropy() + SW_Offset) / GasConstant;
}

void WaterSSTP::getGibbs_RT(doublereal* grt) const
{
    *grt = (m_sub.Gibbs() + EW_Offset) / RT() - SW_Offset / GasConstant;
    if (!m_ready) {
        throw CanteraError("waterSSTP::", "Phase not ready");
    }
}

void WaterSSTP::getStandardChemPotentials(doublereal* gss) const
{
    *gss = (m_sub.Gibbs() + EW_Offset - SW_Offset*temperature());
    if (!m_ready) {
        throw CanteraError("waterSSTP::", "Phase not ready");
    }
}

void WaterSSTP::getCp_R(doublereal* cpr) const
{
    cpr[0] = m_sub.cp() / GasConstant;
}

doublereal WaterSSTP::cv_mole() const
{
    return m_sub.cv();
}

void WaterSSTP::getEnthalpy_RT_ref(doublereal* hrt) const
{
    doublereal p = pressure();
    double T = temperature();
    double dens = density();
    int waterState = WATER_GAS;
    double rc = m_sub.Rhocrit();
    if (dens > rc) {
        waterState = WATER_LIQUID;
    }
    doublereal dd = m_sub.density(T, OneAtm, waterState, dens);
    if (dd <= 0.0) {
        throw CanteraError("setPressure", "error");
    }
    doublereal h = m_sub.enthalpy();
    *hrt = (h + EW_Offset) / RT();
    dd = m_sub.density(T, p, waterState, dens);
}

void WaterSSTP::getGibbs_RT_ref(doublereal* grt) const
{
    doublereal p = pressure();
    double T = temperature();
    double dens = density();
    int waterState = WATER_GAS;
    double rc = m_sub.Rhocrit();
    if (dens > rc) {
        waterState = WATER_LIQUID;
    }
    doublereal dd = m_sub.density(T, OneAtm, waterState, dens);
    if (dd <= 0.0) {
        throw CanteraError("setPressure", "error");
    }
    m_sub.setState_TR(T, dd);
    doublereal g = m_sub.Gibbs();
    *grt = (g + EW_Offset - SW_Offset*T)/ RT();
    dd = m_sub.density(T, p, waterState, dens);
}

void WaterSSTP::getGibbs_ref(doublereal* g) const
{
    getGibbs_RT_ref(g);
    for (size_t k = 0; k < m_kk; k++) {
        g[k] *= RT();
    }
}

void WaterSSTP::getEntropy_R_ref(doublereal* sr) const
{
    doublereal p = pressure();
    double T = temperature();
    double dens = density();
    int waterState = WATER_GAS;
    double rc = m_sub.Rhocrit();
    if (dens > rc) {
        waterState = WATER_LIQUID;
    }
    doublereal dd = m_sub.density(T, OneAtm, waterState, dens);

    if (dd <= 0.0) {
        throw CanteraError("setPressure", "error");
    }
    m_sub.setState_TR(T, dd);

    doublereal s = m_sub.entropy();
    *sr = (s + SW_Offset)/ GasConstant;
    dd = m_sub.density(T, p, waterState, dens);
}

void WaterSSTP::getCp_R_ref(doublereal* cpr) const
{
    doublereal p = pressure();
    double T = temperature();
    double dens = density();
    int waterState = WATER_GAS;
    double rc = m_sub.Rhocrit();
    if (dens > rc) {
        waterState = WATER_LIQUID;
    }
    doublereal dd = m_sub.density(T, OneAtm, waterState, dens);
    m_sub.setState_TR(T, dd);
    if (dd <= 0.0) {
        throw CanteraError("setPressure", "error");
    }
    doublereal cp = m_sub.cp();
    *cpr = cp / GasConstant;
    dd = m_sub.density(T, p, waterState, dens);
}

void WaterSSTP::getStandardVolumes_ref(doublereal* vol) const
{
    doublereal p = pressure();
    double T = temperature();
    double dens = density();
    int waterState = WATER_GAS;
    double rc = m_sub.Rhocrit();
    if (dens > rc) {
        waterState = WATER_LIQUID;
    }
    doublereal dd = m_sub.density(T, OneAtm, waterState, dens);
    if (dd <= 0.0) {
        throw CanteraError("setPressure", "error");
    }
    *vol = meanMolecularWeight() /dd;
    dd = m_sub.density(T, p, waterState, dens);
}

doublereal WaterSSTP::pressure() const
{
    return m_sub.pressure();
}

void WaterSSTP::setPressure(doublereal p)
{
    double T = temperature();
    double dens = density();
    int waterState = WATER_GAS;
    double rc = m_sub.Rhocrit();
    if (dens > rc) {
        waterState = WATER_LIQUID;
    }
    doublereal dd = m_sub.density(T, p, waterState, dens);
    if (dd <= 0.0) {
        throw CanteraError("setPressure", "error");
    }
    setDensity(dd);
}

doublereal WaterSSTP::isothermalCompressibility() const
{
    return m_sub.isothermalCompressibility();
}

doublereal WaterSSTP::thermalExpansionCoeff() const
{
    return m_sub.coeffThermExp();
}

doublereal WaterSSTP::dthermalExpansionCoeffdT() const
{
    doublereal pres = pressure();
    doublereal dens_save = density();
    double T = temperature();
    double tt = T - 0.04;
    doublereal dd = m_sub.density(tt, pres, WATER_LIQUID, dens_save);
    if (dd < 0.0) {
        throw CanteraError("WaterSSTP::dthermalExpansionCoeffdT",
            "Unable to solve for the density at T = {}, P = {}", tt, pres);
    }
    doublereal vald = m_sub.coeffThermExp();
    m_sub.setState_TR(T, dens_save);
    doublereal val2 = m_sub.coeffThermExp();
    return (val2 - vald) / 0.04;
}

doublereal WaterSSTP::critTemperature() const
{
    return m_sub.Tcrit();
}

doublereal WaterSSTP::critPressure() const
{
    return m_sub.Pcrit();
}

doublereal WaterSSTP::critDensity() const
{
    return m_sub.Rhocrit();
}

void WaterSSTP::setTemperature(const doublereal temp)
{
    Phase::setTemperature(temp);
    m_sub.setState_TR(temp, density());
}

void WaterSSTP::setDensity(const doublereal dens)
{
    Phase::setDensity(dens);
    m_sub.setState_TR(temperature(), dens);
}

doublereal WaterSSTP::satPressure(doublereal t) {
    doublereal tsave = temperature();
    doublereal dsave = density();
    doublereal pp = m_sub.psat(t);
    m_sub.setState_TR(tsave, dsave);
    return pp;
}

doublereal WaterSSTP::vaporFraction() const
{
    if (temperature() >= m_sub.Tcrit()) {
        double dens = density();
        if (dens >= m_sub.Rhocrit()) {
            return 0.0;
        }
        return 1.0;
    }
    // If below tcrit we always return 0 from this class
    return 0.0;
}

}