Buildings.HeatTransfer.Convection.BaseClasses

Information

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

Package Content

Name	Description
PartialConvection	Partial model for heat convection

Buildings.HeatTransfer.Convection.BaseClasses.PartialConvection

Information

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;