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Merged
JayHuLBL merged 3 commits into from
Nov 14, 2025
Merged

Issue3492 direct evaporative cooler #4405

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bcc9874
Merge pull request #165 from lbl-srg/issue3492_DirectEvaporativeCooler
karthikeyad-pnnl Jan 9, 2025
90adf03
Updated documentation for all validation models and one component model
karthikeyad-pnnl Nov 14, 2025
c6c0e30
Merge remote-tracking branch 'upstream/issue3492_DirectEvaporativeCoo…
karthikeyad-pnnl Nov 14, 2025
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2 changes: 1 addition & 1 deletion Buildings/Fluid/Humidifiers/EvaporativeCoolers/IndirectDry.mo
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Expand Up @@ -88,7 +88,7 @@ equation
annotation (defaultComponentName="indDryEva",
Documentation(info="<html>
<p>
Model for a indirect dry evaporative cooler.
Model for an indirect dry evaporative cooler.
</p>
<p>
This model contains two components, a direct evaporative cooler
Expand Down
10 changes: 7 additions & 3 deletions Buildings/Fluid/Humidifiers/EvaporativeCoolers/IndirectWet.mo
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Expand Up @@ -174,7 +174,11 @@ equation
annotation (defaultComponentName = "indWetEva",
Documentation(info="<html>
<p>
Model for a indirect dry evaporative cooler.
Model for an indirect wet evaporative cooler. In this component, the primary airflow
is cooled within the heat exchanger by an evaporative effect when water is directly
sprayed on to the secondary surface of the heat exchanger to saturate the secondary
air-flow. Therefore, it is assumed that the secondary air is completely saturated,
and simply vented away after use.
</p>
<p>
This model consists of the following components:
Expand Down Expand Up @@ -206,8 +210,8 @@ air temperature.
<p>
Note: The model works correctly only when the ports a1 and a2 are used as inlet ports,
and ports b1 and b2 are used as outlet ports, for the primary and secondary flow
respectively. Also, the secondary air outlet conditions are currently not validated,
and it is recommended that it is vented to an object acting as a sink, and without
respectively. Also, the secondary air outlet conditions are not validated,
and it is recommended that it be vented to an object acting as a sink without
connecting any downstream components to it.
</p>
</html>", revisions="<html>
Expand Down
20 changes: 14 additions & 6 deletions Buildings/Fluid/Humidifiers/EvaporativeCoolers/Validation/Direct.mo
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Expand Up @@ -51,7 +51,7 @@ model Direct
redeclare final package Medium = MediumA,
final initType=Modelica.Blocks.Types.Init.InitialOutput,
final m_flow_nominal=m_flow_nominal,
final T_start = 293.15)
final T_start=293.15)
"Outlet air temperature sensor"
annotation (Placement(transformation(origin={40,0}, extent={{-10,-10},{10,10}})));

Expand All @@ -62,7 +62,8 @@ model Direct
annotation (Placement(transformation(origin={70,0}, extent={{-10,-10},{10,10}})));

Modelica.Blocks.Math.Mean mea(
final f=1/600)
final f=1/600,
x0=293.15)
"Mean block to average output data"
annotation (Placement(transformation(origin={70,60}, extent={{-10,-10},{10,10}})));

Expand Down Expand Up @@ -141,19 +142,26 @@ The validation generates three subplots.
</p>
<ul>
<li>
Subplot 1 shows the inlet air mass flowrate from the EnergyPlus model varying with the cooling load.
Subplot 1 shows the inlet air mass flowrate measured from the EnergyPlus model
used to activate the component model.
</li>
<li>
Subplot 2 compares the outlet air humidity ratio generated by Modelica and EnergyPlus model.
Subplot 2 compares the outlet air dry bulb temperature measurements from the Modelica
(<code>to_degCOut.y</code>) and EnergyPlus (<code>combiTimeTable.y[7]</code>) models.
The Modelica measurements converge on and then closely track the EnergyPlus
measurements with continuous operation of the component.
</li>
<li>
Subplot 3 compares the outlet air dry bulb temperature generated by Modelica and EnergyPlus model.
Subplot 3 compares the outlet air humidity ratio measurements from the Modelica
(<code>mea1.y</code>) and EnergyPlus (<code>toTotAirOut.XiTotalAir</code>) models.
Again, the Modelica measurements converge on and then closely track the EnergyPlus
measurements with continuous operation of the component.
</li>
</ul>
<p>
The validation results demostrate that, with time-varying air flow rate, the
Modelica model can effectively capture the dynamics of outlet air humidity ratio
and dry bulb temperature, which match the data generated by Energyplus.
and dry bulb temperature.
</p>
</html>", revisions="<html>
<ul>
Expand Down
15 changes: 11 additions & 4 deletions Buildings/Fluid/Humidifiers/EvaporativeCoolers/Validation/IndirectDry.mo
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Expand Up @@ -191,19 +191,26 @@ The validation generates three subplots.
</p>
<ul>
<li>
Subplot 1 shows the inlet air mass flowrate from the EnergyPlus model varying with the cooling load.
Subplot 1 shows the inlet air mass flowrate measured from the EnergyPlus model
used to activate the component model.
</li>
<li>
Subplot 2 compares the outlet air dry bulb temperature generated by Modelica and EnergyPlus model.
Subplot 2 compares the outlet air dry bulb temperature measurements from the Modelica
(<code>TOut_mean.y</code>) and EnergyPlus (<code>combiTimeTable.y[7]</code>) models.
The Modelica measurements converge on and then track the EnergyPlus measurements
with continuous operation of the component.
</li>
<li>
Subplot 3 compares the outlet air humidity ratio generated by Modelica and EnergyPlus model.
Subplot 3 compares the outlet air humidity ratio measurements from the Modelica
(<code>XOut_mean.y</code>) and EnergyPlus (<code>toTotAirPriOut.XiTotalAir</code>)
models. Again, the Modelica measurements converge on and then closely track the
EnergyPlus measurements with continuous operation of the component.
</li>
</ul>
<p>
The validation results demostrate that, with time-varying air flow rate, the
Modelica model can effectively capture the dynamics of outlet air humidity ratio
and dry bulb temperature, which match the data generated by Energyplus.
and dry bulb temperature.
</p>
</html>", revisions="<html>
<ul>
Expand Down
18 changes: 11 additions & 7 deletions Buildings/Fluid/Humidifiers/EvaporativeCoolers/Validation/IndirectWet.mo
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Expand Up @@ -183,22 +183,26 @@ The validation generates three subplots.
</p>
<ul>
<li>
Subplot 1 shows the inlet air mass flowrate from the EnergyPlus model varying
with the cooling load.
Subplot 1 shows the inlet air mass flowrate measured from the EnergyPlus model
used to activate the component model.
</li>
<li>
Subplot 2 compares the outlet air dry bulb temperature generated by Modelica
and EnergyPlus model.
Subplot 2 compares the outlet air dry bulb temperature measurements from the Modelica
(<code>TOut_mean.y</code>) and EnergyPlus (<code>combiTimeTable.y[7]</code>) models.
The Modelica measurements converge on and then track the EnergyPlus measurements
with continuous operation of the component.
</li>
<li>
Subplot 3 compares the outlet air humidity ratio generated by Modelica and
EnergyPlus model.
Subplot 3 compares the outlet air humidity ratio measurements from the Modelica
(<code>XOut_mean.y</code>) and EnergyPlus (<code>toTotAirPriOut.XiTotalAir</code>)
models. Again, the Modelica measurements converge on and then closely track the
EnergyPlus measurements with continuous operation of the component.
</li>
</ul>
<p>
The validation results demostrate that, with time-varying air flow rate,
the Modelica model can effectively capture the dynamics of outlet air humidity
ratio and dry bulb temperature, which match the data generated by Energyplus.
ratio and dry bulb temperature.
</p>
<p>
Note: There is no validation reference data for the secondary outlet air,
Expand Down
6 changes: 3 additions & 3 deletions ...dings/Resources/Scripts/Dymola/Fluid/Humidifiers/EvaporativeCoolers/Validation/Direct.mos
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@@ -1,4 +1,4 @@
simulateModel("Buildings.Fluid.Humidifiers.EvaporativeCoolers.Validation.Direct", method="CVode", tolerance=1e-6, startTime=350000,stopTime=604800, resultFile="DirectEvaporativeCooler");
createPlot(id=1, position={0, 0, 1577, 950}, y={"sou.m_flow_in"}, range={340000.0, 1000000.0, -0.5, 2.0}, autoscale=false, grid=true, colors={{28,108,200}});
createPlot(id=1, position={0, 0, 1577, 314}, y={"toTotAirOut.XiTotalAir", "mea1.y"}, range={300000.0, 1000000.0, -0.005, 0.024999999999999998}, grid=true, subPlot=2, colors={{28,108,200}, {238,46,47}});
createPlot(id=1, position={0, -512, 1579, 958}, y={"to_degCOut.y", "combiTimeTable.y[7]"}, range={340000.0, 900000.0, -10.0, 30.0}, grid=true, subPlot=3, colors={{28,108,200}, {238,46,47}}, displayUnits={"degC", ""});
createPlot(id=1, position={0, 0, 1577, 950}, y={"sou.m_flow_in"}, range={340000.0, 605000.0, -0.5, 2.0}, autoscale=false, grid=true, colors={{28,108,200}});
createPlot(id=1, position={0, -512, 1579, 958}, y={"to_degCOut.y", "combiTimeTable.y[7]"}, range={340000.0, 605000.0, 0.0, 30.0}, grid=true, subPlot=2, colors={{28,108,200}, {238,46,47}}, displayUnits={"degC", ""});
createPlot(id=1, position={0, 0, 1577, 314}, y={"toTotAirOut.XiTotalAir", "mea1.y"}, range={340000.0, 605000.0, -0.005, 0.025}, grid=true, subPlot=3, colors={{28,108,200}, {238,46,47}});