Buildings.HeatTransfer.Convection.BaseClasses

Information

This package contains base classes that are used to construct the models in Buildings.HeatTransfer.Convection.

Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).

Package Content

Name	Description
PartialConvection	Partial model for heat convection

Buildings.HeatTransfer.Convection.BaseClasses.PartialConvection

Information

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

Parameters

Type	Name	Default	Description
Area	A		Heat transfer area [m2]
CoefficientOfHeatTransfer	hFixed	3	Constant convection coefficient [W/(m2.K)]
Angle	til		Surface tilt [rad]

Connectors

Type	Name	Description
HeatPort_a	solid
HeatPort_b	fluid

Modelica definition

partial model PartialConvection "Partial model for heat convection"
  extends Buildings.BaseClasses.BaseIcon;
  parameter Modelica.SIunits.Area A "Heat transfer area";
  parameter Modelica.SIunits.CoefficientOfHeatTransfer hFixed=3 
    "Constant convection coefficient";
  Modelica.SIunits.HeatFlowRate Q_flow "Heat flow rate from solid -> fluid";
  Modelica.SIunits.HeatFlux q_flow "Convective heat flux 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;

  parameter Modelica.SIunits.Angle til(displayUnit="deg") "Surface tilt";

protected 
  final parameter Real cosTil=Modelica.Math.cos(til) "Cosine of window tilt";
  final parameter Real sinTil=Modelica.Math.sin(til) "Sine of window tilt";
  final parameter Boolean isCeiling = abs(sinTil) < 10E-10 and cosTil > 0 
    "Flag, true if the surface is a ceiling";
  final parameter Boolean isFloor = abs(sinTil) < 10E-10 and cosTil < 0 
    "Flag, true if the surface is a floor";

equation 
  dT = solid.T - fluid.T;
  solid.Q_flow = Q_flow;
  fluid.Q_flow = -Q_flow;
  Q_flow = A*q_flow;
end PartialConvection;