Changed slab to use eps-NTU by default

This is for #290. For the FLEXLAB model, computing time is 4 times lower with this configuration
lbl-srg · Oct 7, 2014 · c06ac4f · c06ac4f
1 parent 15078b0
commit c06ac4f
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Showing 3 changed files with 7 additions and 5 deletions.
diff --git a/Buildings/Fluid/HeatExchangers/RadiantSlabs/Examples/StepResponse.mo b/Buildings/Fluid/HeatExchangers/RadiantSlabs/Examples/StepResponse.mo
@@ -28,8 +28,9 @@ model StepResponse "Model that tests the radiant slab"
     sysTyp=Buildings.Fluid.HeatExchangers.RadiantSlabs.BaseClasses.Types.SystemType.Floor,
     disPip=0.2,
     A=A,
-    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial)
-    "Slabe with embedded pipes"
+    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
+    nSeg=10,
+    use_epsilon_NTU=false) "Slabe with embedded pipes"
     annotation (Placement(transformation(extent={{10,-30},{30,-10}})));
 
   parameter Modelica.SIunits.MassFlowRate m_flow_nominal=

diff --git a/Buildings/Fluid/HeatExchangers/RadiantSlabs/ParallelCircuitsSlab.mo b/Buildings/Fluid/HeatExchangers/RadiantSlabs/ParallelCircuitsSlab.mo
@@ -21,7 +21,7 @@ model ParallelCircuitsSlab
       m_flow_small=m_flow_small/nCir));
 
   parameter Integer nCir(min=1) = 1 "Number of parallel circuits";
-  parameter Integer nSeg(min=1) = 10
+  parameter Integer nSeg(min=1) = 1
     "Number of volume segments in each circuit (along flow path)";
 
   parameter Modelica.SIunits.Area A
@@ -45,7 +45,7 @@ model ParallelCircuitsSlab
   parameter Boolean homotopyInitialization = true "= true, use homotopy method"
     annotation(Evaluate=true, Dialog(tab="Advanced"));
 
-  parameter Boolean use_epsilon_NTU = false
+  parameter Boolean use_epsilon_NTU = true
     "Set to true to use an epsilon-NTU model for the heat conduction"
     annotation(Dialog(tab="Advanced"));
 

diff --git a/Buildings/Fluid/HeatExchangers/RadiantSlabs/SingleCircuitSlab.mo b/Buildings/Fluid/HeatExchangers/RadiantSlabs/SingleCircuitSlab.mo
@@ -2,6 +2,7 @@ within Buildings.Fluid.HeatExchangers.RadiantSlabs;
 model SingleCircuitSlab "Model of a single circuit of a radiant slab"
   extends Buildings.Fluid.HeatExchangers.RadiantSlabs.BaseClasses.Slab;
   extends Buildings.Fluid.FixedResistances.BaseClasses.Pipe(
+     nSeg=1,
      final diameter=pipe.dIn,
      length=A/disPip,
      final thicknessIns=0,
@@ -21,7 +22,7 @@ model SingleCircuitSlab "Model of a single circuit of a radiant slab"
   parameter Modelica.SIunits.Area A "Surface area of radiant slab"
   annotation(Dialog(group="Construction"));
 
-  parameter Boolean use_epsilon_NTU = false
+  parameter Boolean use_epsilon_NTU = true
     "Set to true to use an epsilon-NTU model for the heat conduction"
     annotation(Dialog(tab="Advanced"));