diff --git a/IDEAS/Buildings/Components/BoundaryWall.mo b/IDEAS/Buildings/Components/BoundaryWall.mo
index 8b440c7d9..cb02e146e 100644
--- a/IDEAS/Buildings/Components/BoundaryWall.mo
+++ b/IDEAS/Buildings/Components/BoundaryWall.mo
@@ -4,7 +4,7 @@ model BoundaryWall "Opaque wall with optional prescribed heat flow rate or tempe
final custom_q50=0,
final use_custom_q50=true,
final nWin=1,
- QTra_design=U_value*A*(273.15 + 21 - TRef_a),
+ QTra_design=if use_T_in or use_T_fixed then U_value*A*(TRef_a - T_in_nom) else -Q_in_nom,
dT_nominal_a=-1,
add_cracks=false,
layMul(disableInitPortB=use_T_in or use_T_fixed, monLay(monLayDyn(each
@@ -15,20 +15,25 @@ model BoundaryWall "Opaque wall with optional prescribed heat flow rate or tempe
annotation(Dialog(group="Boundary conditions"));
parameter Modelica.Units.SI.Temperature T_fixed=294.15
"Fixed boundary temperature"
- annotation (Dialog(group="Boundary conditions", enable=use_T_fixed));
+ annotation (Dialog(group="Boundary conditions",enable=use_T_fixed));
parameter Boolean use_T_in = false
"Get the boundary temperature from the input connector"
annotation(Dialog(group="Boundary conditions"));
+ parameter Modelica.Units.SI.Temperature T_in_nom=T_fixed
+ "Nominal boundary temperature, for calculation of design heat loss"
+ annotation (Dialog(group="Design power", tab="Advanced",enable=use_T_fixed or use_T_in));
parameter Boolean use_Q_in = false
"Get the boundary heat flux from the input connector"
annotation(Dialog(group="Boundary conditions"));
-
+ parameter Modelica.Units.SI.HeatFlowRate Q_in_nom=0
+ "Nominal boundary heat flux, for calculation of design heat loss (positive if entering the wall)"
+ annotation (Dialog(group="Design power", tab="Advanced", enable=use_Q_in));
Modelica.Blocks.Interfaces.RealInput T if use_T_in
"Input for boundary temperature" annotation (Placement(
transformation(extent={{-120,10},{-100,30}}),iconTransformation(extent={{-120,10},
{-100,30}})));
Modelica.Blocks.Interfaces.RealInput Q_flow if use_Q_in
- "Input for boundary heat flow rate entering the wall" annotation (Placement(
+ "Input for boundary heat flow rate entering the wall (positive)" annotation (Placement(
transformation(extent={{-120,-30},{-100,-10}}),
iconTransformation(extent={{-120,
-30},{-100,-10}})));
@@ -169,7 +174,9 @@ to enable an input for a prescribed boundary condition temperature or heat flow
Alternatively, parameters use_T_fixed and T_fixed can be used
to specify a fixed boundary condition temperature.
It is not allowed to enabled multiple of these three options.
-If all are disabled then an adiabatic boundary (Q_flow=0) is used.
+If all are disabled then an adiabatic boundary (Q_flow=0) is used.
+Parameters T_in_nom and Q_in_nom are used for the calculation
+of heat losses, when the temperature boundary condition and heat flow boundary condition are applied, respectively.