Buildings.HeatTransfer.BaseClasses

Information

Extends from Modelica.Fluid.Icons.BaseClassLibrary (Icon for library).

Package Content

Name	Description
PartialConductor	Model for heat conductor
PartialConvection	Model for heat convection
PartialConstruction	Partial model for constructions with and without convective heat transfer coefficient

Buildings.HeatTransfer.BaseClasses.PartialConductor

Information

Extends from Buildings.BaseClasses.BaseIcon (Base icon).

Parameters

Type	Name	Default	Description
Area	A		Heat transfer area [m2]
ThermalResistance	R		Thermal resistance of construction [K/W]

Connectors

Type	Name	Description
HeatPort_a	port_a	Heat port at surface a
HeatPort_b	port_b	Heat port at surface b

Modelica definition

partial model PartialConductor "Model for heat conductor"
  extends Buildings.BaseClasses.BaseIcon;
  parameter Modelica.SIunits.Area A "Heat transfer area";
  final parameter Modelica.SIunits.CoefficientOfHeatTransfer U = UA/A 
    "U-value (without surface heat transfer coefficients)";
  final parameter Modelica.SIunits.ThermalConductance UA = 1/R 
    "Thermal conductance of construction (without surface heat transfer coefficients)";
  parameter Modelica.SIunits.ThermalResistance R 
    "Thermal resistance of construction";
  Modelica.SIunits.TemperatureDifference dT "port_a.T - port_b.T";
public 
  Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a port_a 
    "Heat port at surface a";
  Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b port_b 
    "Heat port at surface b";
equation 
  dT = port_a.T - port_b.T;
end PartialConductor;

Buildings.HeatTransfer.BaseClasses.PartialConvection

Information

Extends from Buildings.BaseClasses.BaseIcon (Base icon).

Parameters

Type	Name	Default	Description
Area	A		Heat transfer area [m2]

Connectors

Type	Name	Description
HeatPort_a	solid
HeatPort_b	fluid

Modelica definition

partial model PartialConvection "Model for heat convection"
  extends Buildings.BaseClasses.BaseIcon;
  parameter Modelica.SIunits.Area A "Heat transfer area";
  Modelica.SIunits.HeatFlowRate Q_flow "Heat flow rate from solid -> fluid";
  Modelica.SIunits.TemperatureDifference dT(start=0) "= solid.T - fluid.T";
  Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a solid;
  Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b fluid;
equation 
  dT = solid.T - fluid.T;
  solid.Q_flow = Q_flow;
  fluid.Q_flow = -Q_flow;
  // Even if hCon is a step function with a step at zero,
  // the product hCon*dT is differentiable at zero with
  // a continuous first derivative
  Q_flow = A*qCon_flow();
end PartialConvection;

Buildings.HeatTransfer.BaseClasses.PartialConstruction

Information

Extends from Buildings.BaseClasses.BaseIcon (Base icon).

Parameters

Type	Name	Default	Description
Area	A		Heat transfer area [m2]
Generic	layers	redeclare parameter Building...	Construction definition from Data.OpaqueConstructions
Initialization
Boolean	steadyStateInitial	false	=true initializes dT(0)/dt=0, false initializes T(0) at fixed temperature using T_a_start and T_b_start
Temperature	T_a_start	293.15	Initial temperature at port_a, used if steadyStateInitial = false [K]
Temperature	T_b_start	293.15	Initial temperature at port_b, used if steadyStateInitial = false [K]

Modelica definition

model PartialConstruction 
  "Partial model for constructions with and without convective heat transfer coefficient"
  extends Buildings.BaseClasses.BaseIcon;
  parameter Modelica.SIunits.Area A "Heat transfer area";

  replaceable parameter Buildings.HeatTransfer.Data.OpaqueConstructions.Generic
    layers "Construction definition from Data.OpaqueConstructions";

  final parameter Integer nLay(min=1, fixed=true) = layers.nLay 
    "Number of layers";
  final parameter Integer nSta[nLay](min=1)={layers.material[i].nSta for i in 1:nLay} 
    "Number of states";
  parameter Boolean steadyStateInitial=false 
    "=true initializes dT(0)/dt=0, false initializes T(0) at fixed temperature using T_a_start and T_b_start";
  parameter Modelica.SIunits.Temperature T_a_start=293.15 
    "Initial temperature at port_a, used if steadyStateInitial = false";
  parameter Modelica.SIunits.Temperature T_b_start=293.15 
    "Initial temperature at port_b, used if steadyStateInitial = false";

end PartialConstruction;