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Issue1793 steam documentation #1801

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merged 6 commits into from
Oct 2, 2023
Merged

Issue1793 steam documentation #1801

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a31c2be
Revised IBPSA.Media.Steam to reflect changes made to Buildings.Media.…
khinkelman Sep 29, 2023
84e04ee
Added publication references
khinkelman Sep 29, 2023
4dca2d1
Fixed typos
khinkelman Sep 29, 2023
5cab3e7
Merge pull request #1800 from khinkelman/issue1793_steamDocumentation
mwetter Sep 29, 2023
20501e5
Merge branch 'master' into issue1793_steamDocumentation
mwetter Sep 29, 2023
9396fc9
Corrected html
mwetter Sep 29, 2023
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55 changes: 46 additions & 9 deletions IBPSA/Media/Steam.mo
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ package Steam
reducedX=true,
fixedX=true,
FluidConstants={Modelica.Media.IdealGases.Common.FluidData.H2O},
ThermoStates=Modelica.Media.Interfaces.Choices.IndependentVariables.pTX,
reference_T=273.15,
reference_p=101325,
reference_X={1},
Expand Down Expand Up @@ -125,8 +126,8 @@ redeclare replaceable function extends specificEnthalpy
constant Temperature TMean = 4.15555698340926E+02 "Mean temperature";
constant Real pSD = 1.13236055019318E+05 "Normalization value";
constant Real TSD = 1.32971013463839E+01 "Normalization value";
AbsolutePressure pHat;
Temperature THat;
Modelica.Units.SI.PressureDifference pHat;
Modelica.Units.SI.TemperatureDifference THat;
algorithm
pHat := (state.p - pMean)/pSD;
THat := (state.T - TMean)/TSD;
Expand Down Expand Up @@ -170,8 +171,8 @@ redeclare replaceable function extends specificEntropy
constant Temperature TMean = 4.15555698340926E+02 "Mean temperature";
constant Real pSD = 1.13236055019318E+05 "Normalization value";
constant Real TSD = 1.32971013463839E+01 "Normalization value";
AbsolutePressure pHat;
Temperature THat;
Modelica.Units.SI.PressureDifference pHat;
Modelica.Units.SI.TemperatureDifference THat;
algorithm
pHat := (state.p - pMean)/pSD;
THat := (state.T - TMean)/TSD;
Expand Down Expand Up @@ -728,7 +729,7 @@ function temperature_ph
constant Temperature TMean = 4.15555698340926E+02 "Mean temperature";
constant Real pSD = 1.13236055019318E+05 "Normalization value";
constant Real TSD = 1.32971013463839E+01 "Normalization value";
AbsolutePressure pHat;
Modelica.Units.SI.PressureDifference pHat;
algorithm
pHat := (p - pMean)/pSD;
T := b[1] + b[2]*pHat + b[3]*h;
Expand Down Expand Up @@ -773,8 +774,8 @@ function temperature_ps
constant Temperature TMean = 4.15555698340926E+02 "Mean temperature";
constant Real pSD = 1.13236055019318E+05 "Normalization value";
constant Real TSD = 1.32971013463839E+01 "Normalization value";
AbsolutePressure pHat;
Temperature THat;
Modelica.Units.SI.PressureDifference pHat;
Modelica.Units.SI.TemperatureDifference THat;
algorithm
pHat := (p - pMean)/pSD;
THat := (s - a[1] - pHat*(a[2] + a[4]*pHat))/(a[3] + a[5]*pHat);
Expand Down Expand Up @@ -818,10 +819,14 @@ function rho_pT "Density as function of temperature and pressure"
Modelica.Media.Common.GibbsDerivs g
"Dimensionless Gibbs function and derivatives w.r.t. pi and tau";
SpecificHeatCapacity R "Specific gas constant of water vapor";
function g2_smooth
extends Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.g2;
annotation(smoothOrder=2);
end g2_smooth;
algorithm
R := Modelica.Media.Water.IF97_Utilities.BaseIF97.data.RH2O;
// Region 2 properties
g := Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.g2(p, T);
g := g2_smooth(p, T);
rho := p/(R*T*g.pi*g.gpi);
annotation (
Inline=true,
Expand All @@ -847,7 +852,6 @@ algorithm
region=2);
annotation (Inline=true);
end pressure_dT;

annotation (Icon(graphics={
Line(
points={{50,30},{30,10},{50,-10},{30,-30}},
Expand Down Expand Up @@ -913,9 +917,42 @@ steam heating processes involving low and medium pressure steam.
properties of water and steam,&rdquo; <i>J. Eng. Gas Turbines Power</i>, vol. 122, no.
1, pp. 150&ndash;180, 2000.
</p>
<p>
Kathryn Hinkelman, Saranya Anbarasu, Michael Wetter, Antoine Gautier, Wangda Zuo. 2022.
&ldquo;A Fast and Accurate Modeling Approach for Water and Steam
Thermodynamics with Practical Applications in District Heating System Simulation,&rdquo;
<i>Energy</i>, 254(A), pp. 124227.
<a href=\"https://doi.org/10.1016/j.energy.2022.124227\">10.1016/j.energy.2022.124227</a>
</p>
<p>
Kathryn Hinkelman, Saranya Anbarasu, Michael Wetter, Antoine Gautier, Baptiste Ravache, Wangda Zuo 2022.
&ldquo;Towards Open-Source Modelica Models For Steam-Based District Heating Systems.&rdquo;
<i>Proc. of the 1st International Workshop On Open Source Modelling And Simulation Of
Energy Systems (OSMSES 2022)</i>, Aachen, German, April 4-5, 2022.
<a href=\"https://doi.org/10.1109/OSMSES54027.2022.9769121\">10.1109/OSMSES54027.2022.9769121</a>
</p>
</html>", revisions="<html>
<ul>
<li>
September 29, 2023, by Kathryn Hinkelman:<br/>
Added publication references.
</li>
<li>
March 10, 2023, by Saranya Anbarasu:<br/>
Changed the variable type definition of <code>pHat</code> and <code>THat</code>
from absolute to <code>Modelica.Units.SI.PressureDifference</code> and
<code>Modelica.Units.SI.TemperatureDifference</code> to prevent min/max
assertion errors during initilization.
</li>
<li>
May 9, 2022, by David Blum:<br/>
In function <code>rho_pT</code>, created and used new function extending
<code>Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.g2</code> with an
annotation <code>smoothOrder=2</code>. This is to specifically pass on the
<code>smoothOrder=2</code> annotion placed on <code>rho_pT</code> to
the <code>g2</code> function.
</li>
<li>
April 13, 2021, by Kathryn Hinkelman:<br/>
Changed pressure from constant to variable and reduced applicable
pressure-temperature range to improve accuracy of polynomial approximations.
Expand Down