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Corrected unit propagation error (maint_10.0.x) #4530

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7f8d867
Corrected unit propagation error (maint_10.0.x)
mwetter Apr 6, 2026
7cf1ad8
Reverted backward incompatible changes
mwetter Apr 6, 2026
0964f53
Checked out file from maint_12.x PR
mwetter Apr 13, 2026
9266731
Updated reference result
mwetter Apr 17, 2026
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7 changes: 6 additions & 1 deletion Buildings/Fluid/Actuators/BaseClasses/PartialTwoWayValve.mo
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ partial model PartialTwoWayValve "Partial model for a two way valve"
parameter Real kFixed(unit="", min=0) = if dpFixed_nominal > Modelica.Constants.eps
then m_flow_nominal / sqrt(dpFixed_nominal) else 0
"Flow coefficient of fixed resistance that may be in series with valve, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2).";
Real kVal(unit="1", min=Modelica.Constants.small)
Real kVal(unit="", min=Modelica.Constants.small)
"Flow coefficient of valve, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2).";
Real k(unit="", min=Modelica.Constants.small)
"Flow coefficient of valve and pipe in series, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2).";
Expand Down Expand Up @@ -97,6 +97,11 @@ each valve opening characteristics has different parameters.
revisions="<html>
<ul>
<li>
March 31, 2026, by Michael Wetter:<br/>
Corrected unit propagation error that causes Dymola 2026x to not show certain units.<br/>
See <a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/2100\">#2100</a>.
</li>
<li>
January 19, 2026, by Jelger Jansen:<br/>
Added unit 1 to parameter <code>kVal</code> to avoid FMU unit errors.<br/>
This is for <a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/2074\">#2074</a>.
Expand Down
131 changes: 75 additions & 56 deletions Buildings/Fluid/CHPs/BaseClasses/EnergyConversion.mo
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -62,10 +62,10 @@ protected
annotation (Placement(transformation(extent={{110,30},{130,50}})));
Buildings.Fluid.CHPs.BaseClasses.EnergyConversionNormal opeModBas(final per=
per) "Typical energy conversion mode"
annotation (Placement(transformation(extent={{-20,-10},{0,10}})));
annotation (Placement(transformation(extent={{-20,-40},{0,-20}})));
Buildings.Fluid.CHPs.BaseClasses.EnergyConversionWarmUp opeModWarUpEngTem(
final per=per) if not per.warmUpByTimeDelay "Warm-up by engine temperature"
annotation (Placement(transformation(extent={{-20,-60},{0,-40}})));
annotation (Placement(transformation(extent={{-20,-80},{0,-60}})));
Buildings.Controls.OBC.CDL.Reals.Sources.Constant const(final k=0)
"Zero constant"
annotation (Placement(transformation(extent={{-100,60},{-80,80}})));
Expand All @@ -79,7 +79,7 @@ protected
annotation (Placement(transformation(extent={{-100,90},{-80,110}})));
Buildings.Controls.OBC.CDL.Reals.Switch switch2
"Switch between warm-up and normal value"
annotation (Placement(transformation(extent={{80,70},{100,90}})));
annotation (Placement(transformation(extent={{80,82},{100,102}})));
Buildings.Controls.OBC.CDL.Reals.Switch switch3
"Switch between warm-up and normal value"
annotation (Placement(transformation(extent={{80,10},{100,30}})));
Expand All @@ -92,34 +92,45 @@ protected
Buildings.Controls.OBC.CDL.Reals.Sources.Constant PEleTimeDel(final k=0)
if per.warmUpByTimeDelay
"Zero power output in case of warm-up by time delay"
annotation (Placement(transformation(extent={{-20,90},{0,110}})));
annotation (Placement(transformation(extent={{-20,110},{0,130}})));
Buildings.Controls.OBC.CDL.Logical.Sources.Constant delWarUp(
final k=per.warmUpByTimeDelay) "Warm-up by time delay"
annotation (Placement(transformation(extent={{-100,-120},{-80,-100}})));
annotation (Placement(transformation(extent={{-100,-130},{-80,-110}})));
Modelica.Blocks.Sources.BooleanExpression wamUpMod(
final y=opeMod == CHPs.BaseClasses.Types.Mode.WarmUp)
"Check whether warm-up mode is active"
annotation (Placement(transformation(extent={{-100,30},{-80,50}})));
Buildings.Controls.OBC.CDL.Logical.Not engTemWarUp
"Warm-up based on engine temperature"
annotation (Placement(transformation(extent={{-60,-120},{-40,-100}})));
annotation (Placement(transformation(extent={{-60,-130},{-40,-110}})));
Buildings.Controls.OBC.CDL.Logical.And and1
"True if warm-up mode and warm-up based on engine temperature"
annotation (Placement(transformation(extent={{-20,-90},{0,-70}})));
Buildings.Controls.OBC.CDL.Reals.Sources.Constant dumTimDel(
final k=0) if per.warmUpByTimeDelay
"Set dummy value in case of warm-up by time delay"
annotation (Placement(transformation(extent={{-20,30},{0,50}})));
annotation (Placement(transformation(extent={{-20,-122},{0,-102}})));
Buildings.Controls.OBC.CDL.Reals.Sources.Constant dumTimDelFue(
final k=0,
y(unit="kg/s"))
if per.warmUpByTimeDelay "Set dummy value in case of warm-up by time delay"
annotation (Placement(transformation(extent={{-20,52},{0,72}})));
Controls.OBC.CDL.Reals.Sources.Constant dumTimDelAir(
final k=0,
y(unit="kg/s"))
if per.warmUpByTimeDelay "Set dummy value in case of warm-up by time delay"
annotation (Placement(transformation(extent={{-20,20},{0,40}})));
Controls.OBC.CDL.Reals.Sources.Constant dumTimDelGen(
final k=0,
y(unit="W"))
if per.warmUpByTimeDelay "Set dummy value in case of warm-up by time delay"
annotation (Placement(transformation(extent={{-20,-10},{0,10}})));

equation
connect(opeModBas.mWat_flow, mWat_flow) annotation (Line(points={{-22,0},{-120,
0},{-120,20},{-160,20}}, color={0,0,127}));
connect(opeModBas.TWatIn, TWatIn) annotation (Line(points={{-22,-6},{-100,-6},
connect(opeModBas.mWat_flow, mWat_flow) annotation (Line(points={{-22,-30},{-110,
-30},{-110,20},{-160,20}}, color={0,0,127}));
connect(opeModBas.TWatIn, TWatIn) annotation (Line(points={{-22,-36},{-100,-36},
{-100,-20},{-160,-20}},color={0,0,127}));
connect(opeModWarUpEngTem.TEng, TEng) annotation (Line(points={{-22,-58},{-110,
-58},{-110,-90},{-160,-90}}, color={0,0,127}));
connect(opeModWarUpEngTem.TWatIn, TWatIn) annotation (Line(points={{-22,-47},{
-100,-47},{-100,-20},{-160,-20}},
connect(opeModWarUpEngTem.TEng, TEng) annotation (Line(points={{-22,-78},{-110,
-78},{-110,-90},{-160,-90}}, color={0,0,127}));
connect(opeModWarUpEngTem.TWatIn, TWatIn) annotation (Line(points={{-22,-67},{
-100,-67},{-100,-20},{-160,-20}},
color={0,0,127}));
connect(const.y, switch.u3) annotation (Line(points={{-78,70},{-70,70},{-70,
92},{-62,92}},
Expand All @@ -130,62 +141,65 @@ equation
connect(booExp.y, switch.u2) annotation (Line(points={{-79,100},{-62,100}},
color={255,0,255}));
connect(switch.y, opeModBas.PEle) annotation (Line(points={{-38,100},{-30,100},
{-30,6},{-22,6}}, color={0,0,127}));
connect(opeModWarUpEngTem.PEleNet, switch2.u1) annotation (Line(points={{2,-42},
{20,-42},{20,88},{78,88}}, color={0,0,127}));
connect(switch2.y, PEleNet) annotation (Line(points={{102,80},{160,80}},
{-30,-24},{-22,-24}},
color={0,0,127}));
connect(opeModWarUpEngTem.PEleNet, switch2.u1) annotation (Line(points={{2,-62},
{20,-62},{20,100},{78,100}},
color={0,0,127}));
connect(switch2.y, PEleNet) annotation (Line(points={{102,92},{120,92},{120,80},
{160,80}},
color={0,0,127}));
connect(switch3.y, mFue_flow) annotation (Line(points={{102,20},{160,20}},
color={0,0,127}));
connect(switch4.y, mAir_flow) annotation (Line(points={{102,-40},{160,-40}},
color={0,0,127}));
connect(switch5.y, QGen_flow)
annotation (Line(points={{102,-100},{160,-100}}, color={0,0,127}));
connect(opeModBas.mFue_flow, switch3.u3) annotation (Line(points={{2,6},{60,6},
{60,12},{78,12}}, color={0,0,127}));
connect(opeModWarUpEngTem.mFue_flow, switch3.u1) annotation (Line(points={{2,-47},
{26,-47},{26,28},{78,28}}, color={0,0,127}));
connect(opeModBas.mAir_flow, switch4.u3) annotation (Line(points={{2,0},{60,0},
{60,-48},{78,-48}}, color={0,0,127}));
connect(opeModWarUpEngTem.mAir_flow, switch4.u1) annotation (Line(points={{2,-53},
{40,-53},{40,-32},{78,-32}}, color={0,0,127}));
connect(opeModWarUpEngTem.QGen_flow, switch5.u1) annotation (Line(points={{2,-58},
{32,-58},{32,-92},{78,-92}}, color={0,0,127}));
connect(opeModBas.QGen_flow, switch5.u3) annotation (Line(points={{2.2,-6},{54,
-6},{54,-108},{78,-108}}, color={0,0,127}));
connect(opeModBas.mFue_flow, switch3.u3) annotation (Line(points={{2,-24},{60,
-24},{60,12},{78,12}},color={0,0,127}));
connect(opeModWarUpEngTem.mFue_flow, switch3.u1) annotation (Line(points={{2,-67},
{26,-67},{26,28},{78,28}}, color={0,0,127}));
connect(opeModBas.mAir_flow, switch4.u3) annotation (Line(points={{2,-30},{60,
-30},{60,-48},{78,-48}}, color={0,0,127}));
connect(opeModWarUpEngTem.mAir_flow, switch4.u1) annotation (Line(points={{2,-73},
{40,-73},{40,-32},{78,-32}}, color={0,0,127}));
connect(opeModWarUpEngTem.QGen_flow, switch5.u1) annotation (Line(points={{2,-78},
{32,-78},{32,-92},{78,-92}}, color={0,0,127}));
connect(opeModBas.QGen_flow, switch5.u3) annotation (Line(points={{2.2,-36},{54,
-36},{54,-108},{78,-108}}, color={0,0,127}));
connect(mWat_flow, opeModWarUpEngTem.mWat_flow) annotation (Line(points={{-160,20},
{-120,20},{-120,-42},{-22,-42}}, color={0,0,127}));
{-110,20},{-110,-62},{-22,-62}}, color={0,0,127}));
connect(switch3.y, assFue.mFue_flow) annotation (Line(points={{102,20},{104,20},
{104,40},{108,40}}, color={0,0,127}));
connect(PEleTimeDel.y, switch2.u1) annotation (Line(points={{2,100},{60,100},{
60,88},{78,88}}, color={0,0,127}));
connect(PEleTimeDel.y, switch2.u1) annotation (Line(points={{2,120},{60,120},{
60,100},{78,100}},
color={0,0,127}));
connect(switch.y, switch2.u3) annotation (Line(points={{-38,100},{-30,100},{-30,
72},{78,72}}, color={0,0,127}));
84},{78,84}}, color={0,0,127}));
connect(TRoo, opeModWarUpEngTem.TRoo) annotation (Line(points={{-160,-60},{-120,
-60},{-120,-53},{-22,-53}}, color={0,0,127}));
-60},{-120,-73},{-22,-73}}, color={0,0,127}));
connect(delWarUp.y, engTemWarUp.u)
annotation (Line(points={{-78,-110},{-62,-110}}, color={255,0,255}));
connect(engTemWarUp.y, and1.u2) annotation (Line(points={{-38,-110},{-30,-110},
{-30,-88},{-22,-88}}, color={255,0,255}));
connect(wamUpMod.y, and1.u1) annotation (Line(points={{-79,40},{-60,40},{-60,
-80},{-22,-80}},
annotation (Line(points={{-78,-120},{-62,-120}}, color={255,0,255}));
connect(engTemWarUp.y, and1.u2) annotation (Line(points={{-38,-120},{-22,-120}},
color={255,0,255}));
connect(wamUpMod.y, and1.u1) annotation (Line(points={{-79,40},{-60,40},{-60,-100},
{-30,-100},{-30,-112},{-22,-112}},
color={255,0,255}));
connect(and1.y, switch3.u2) annotation (Line(points={{2,-80},{70,-80},{70,20},
connect(and1.y, switch3.u2) annotation (Line(points={{2,-112},{70,-112},{70,20},
{78,20}}, color={255,0,255}));
connect(and1.y, switch4.u2) annotation (Line(points={{2,-80},{70,-80},{70,-40},
connect(and1.y, switch4.u2) annotation (Line(points={{2,-112},{70,-112},{70,-40},
{78,-40}}, color={255,0,255}));
connect(and1.y, switch5.u2) annotation (Line(points={{2,-80},{70,-80},{70,-100},
connect(and1.y, switch5.u2) annotation (Line(points={{2,-112},{70,-112},{70,-100},
{78,-100}}, color={255,0,255}));
connect(wamUpMod.y, switch2.u2) annotation (Line(points={{-79,40},{-60,40},{
-60,80},{78,80}},
color={255,0,255}));
connect(dumTimDel.y, switch3.u1) annotation (Line(points={{2,40},{26,40},{26,28},
{78,28}}, color={0,0,127}));
connect(dumTimDel.y, switch4.u1) annotation (Line(points={{2,40},{40,40},{40,-32},
{78,-32}}, color={0,0,127}));
connect(dumTimDel.y, switch5.u1) annotation (Line(points={{2,40},{32,40},{32,-92},
{78,-92}}, color={0,0,127}));
connect(wamUpMod.y, switch2.u2) annotation (Line(points={{-79,40},{-60,40},{-60,
92},{78,92}}, color={255,0,255}));
connect(dumTimDelFue.y, switch3.u1) annotation (Line(points={{2,62},{26,62},{26,
28},{78,28}}, color={0,0,127}));

connect(switch4.u1, dumTimDelAir.y) annotation (Line(points={{78,-32},{40,-32},
{40,30},{2,30}}, color={0,0,127}));
connect(switch5.u1, dumTimDelGen.y) annotation (Line(points={{78,-92},{32,-92},
{32,0},{2,0}}, color={0,0,127}));
annotation (
defaultComponentName="eneCon",
Diagram(coordinateSystem(extent={{-140,-140},{140,140}})),
Expand All @@ -208,6 +222,11 @@ combustion engines).
</html>", revisions="<html>
<ul>
<li>
March 31, 2026, by Michael Wetter:<br/>
Corrected unit propagation error that causes Dymola 2026x to not show certain units.<br/>
See <a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/2100\">#2100</a>.
</li>
<li>
April 8, 2020, by Antoine Gautier:<br/>
Refactored implementation.
</li>
Expand Down
10 changes: 9 additions & 1 deletion Buildings/Fluid/Examples/Performance/BaseClasses/Example1.mo
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,10 @@ partial model Example1 "Example 1 partial model"
annotation (Placement(transformation(extent={{-20,20},{0,40}})));
Modelica.Blocks.Sources.Pulse pulse(period=1000) "Pulse input"
annotation (Placement(transformation(extent={{-60,70},{-40,90}})));
Modelica.Blocks.Math.Gain gain(k=m_flow_nominal) "Gain for m_flow_nominal"
Modelica.Blocks.Math.Gain gain(
k=m_flow_nominal,
u(unit="1"),
y(unit="kg/s")) "Gain for m_flow_nominal"
annotation (Placement(transformation(extent={{0,70},{20,90}})));
Buildings.Fluid.Actuators.Valves.ThreeWayLinear val(
redeclare package Medium = Medium,
Expand Down Expand Up @@ -109,6 +112,11 @@ and is created to avoid errors in the implementation of the two depending exampl
</html>", revisions="<html>
<ul>
<li>
March 31, 2026, by Michael Wetter:<br/>
Corrected unit propagation error that causes Dymola 2026x to not show certain units.<br/>
See <a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/2100\">#2100</a>.
</li>
<li>
May 8, 2017, by Michael Wetter:<br/>
Updated heater model.<br/>
This is for
Expand Down
35 changes: 30 additions & 5 deletions Buildings/Fluid/Examples/ResistanceVolumeFlowReversal.mo
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,10 @@ model ResistanceVolumeFlowReversal
annotation (Placement(transformation(extent={{-40,-30},{-20,-10}})));
Modelica.Blocks.Sources.Pulse pulse(period=1000) "Pulse input"
annotation (Placement(transformation(extent={{-80,40},{-60,60}})));
Modelica.Blocks.Math.Gain gain(k=m_flow_nominal) "Gain for m_flow_nominal"
Modelica.Blocks.Math.Gain gain(
k=m_flow_nominal,
u(unit="1"),
y(unit="kg/s")) "Gain for m_flow_nominal"
annotation (Placement(transformation(extent={{-40,40},{-20,60}})));
Buildings.Fluid.Actuators.Valves.ThreeWayLinear val(
redeclare package Medium = Medium,
Expand Down Expand Up @@ -59,6 +62,13 @@ model ResistanceVolumeFlowReversal
each energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
each allowFlowReversal=true) "Mixing volumes for enthalpy circuit"
annotation (Placement(transformation(extent={{60,-66},{40,-46}})));
Buildings.Fluid.Sensors.TemperatureTwoPort senTem[nRes.k](
redeclare final package Medium = Medium,
each final m_flow_nominal=m_flow_nominal/nRes.k,
each initType=Modelica.Blocks.Types.Init.SteadyState) "Temperature sensor"
annotation (Placement(transformation(extent={{10,-10},{-10,10}},
rotation=0,
origin={20,-70})));
equation
connect(bou.ports[1],hea. port_a) annotation (Line(
points={{-60,-20},{-40,-20}},
Expand Down Expand Up @@ -89,12 +99,15 @@ equation
points={{40,-20},{56,-20}},
color={0,127,255}));
connect(res[i].port_b, vol[i].ports[1]) annotation (Line(
points={{76,-20},{80,-20},{80,-70},{52,-70},{52,-66}},
color={0,127,255}));
connect(vol[i].ports[2], val.port_3) annotation (Line(
points={{48,-66},{48,-70},{0,-70},{0,-30}},
points={{76,-20},{80,-20},{80,-70},{51,-70},{51,-66}},
color={0,127,255}));
connect(vol[i].ports[2], senTem[i].port_a) annotation (Line(
points={{49,-66},{49,-70},{30,-70}},
color={0,127,255}));
connect(senTem[i].port_b, val.port_3) annotation (Line(
points={{10,-70},{0,-70},{0,-30}}, color={0,127,255}));
end for;

annotation (experiment(
Tolerance=1e-6, StopTime=10000),
__Dymola_Commands(file="modelica://Buildings/Resources/Scripts/Dymola/Fluid/Examples/ResistanceVolumeFlowReversal.mos"
Expand Down Expand Up @@ -153,6 +166,18 @@ Sizes after manipulation of the nonlinear systems: {1, 9, <b>1</b>}
</html>", revisions="<html>
<ul>
<li>
March 31, 2026, by Michael Wetter:<br/>
Corrected unit propagation error that causes Dymola 2026x to not show certain units.<br/>
See <a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/2100\">#2100</a>.
</li>
<li>
July 18, 2025, by Hongxiang Fu:<br/>
Added two-port temperature sensors to replace <code>vol[:].T</code>
from reference results.<br/>
This is for
<a href=\"https://github.com/lbl-srg/modelica-buildings/issues/4276\">#4276</a>.
</li>
<li>
September 21, 2017, by Michael Wetter:<br/>
Corrected parameterization to be independent of <code>k</code>.<br/>
This is for
Expand Down
32 changes: 26 additions & 6 deletions Buildings/Fluid/FixedResistances/PressureDrop.mo
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -14,13 +14,20 @@ model PressureDrop
m_flow_nominal_pos / sqrt(dp_nominal_pos) else 0
"Flow coefficient, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2)";
protected
final parameter Boolean computeFlowResistance=(dp_nominal_pos > Modelica.Constants.eps)
parameter Boolean disableComputeFlowResistance_internal=false
"=false to disable computation of flow resistance"
annotation(Evaluate=true);
final parameter Boolean computeFlowResistance=
(dp_nominal_pos > Modelica.Constants.eps) and not disableComputeFlowResistance_internal
"Flag to enable/disable computation of flow resistance"
annotation(Evaluate=true);
final parameter Real coeff=
final parameter Real coeM(final unit="kg/(s.Pa)")=
if linearized and computeFlowResistance
then if from_dp then k^2/m_flow_nominal_pos else m_flow_nominal_pos/k^2
else 0
then k^2/m_flow_nominal_pos else 0
"Precomputed coefficient to avoid division by parameter";
final parameter Real coeP(final unit="s.Pa/kg")=
if linearized and computeFlowResistance
then m_flow_nominal_pos/k^2 else 0
"Precomputed coefficient to avoid division by parameter";
initial equation
if computeFlowResistance then
Expand All @@ -33,9 +40,9 @@ equation
if computeFlowResistance then
if linearized then
if from_dp then
m_flow = dp*coeff;
m_flow = dp*coeM;
else
dp = m_flow*coeff;
dp = m_flow*coeP;
end if;
else
if homotopyInitialization then
Expand Down Expand Up @@ -125,6 +132,9 @@ then the pressure drop is computed as a linear function of the
mass flow rate.
</p>
<p>
To disable any pressure drop calculation, set <code>dp_nominal = 0</code>.
</p>
<p>
Setting <code>allowFlowReversal=false</code> can lead to simpler
equations. However, this should only be set to <code>false</code>
if one can guarantee that the flow never reverses its direction.
Expand Down Expand Up @@ -177,6 +187,16 @@ This leads to simpler equations.
</html>", revisions="<html>
<ul>
<li>
March 31, 2026, by Michael Wetter:<br/>
Corrected unit propagation error that causes Dymola 2026x to not show certain units.<br/>
See <a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/2100\">#2100</a>.
</li>
<li>
April 25, 2025, by Fabian Wuelhorst and Michael Wetter:<br/>
Add option to disable <code>computeFlowResistance</code> for extending classes.<br/>
See <a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/2001\">#2001</a>.
</li>
<li>
September 21, 2018, by Michael Wetter:<br/>
Decrease value of <code>deltaM(min=...)</code> attribute.
See <a href=\"https://github.com/ibpsa/modelica-ibpsa/issues/1026\">#1026</a>.
Expand Down
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