Buildings.Fluid.HeatExchangers.Radiators.Examples

Information

This package contains examples for the use of models that can be found in Buildings.Fluid.HeatExchangers.Radiators.

Package Content

Name	Description
RadiatorEN442_2	Test model for radiator

Buildings.Fluid.HeatExchangers.Radiators.Examples.RadiatorEN442_2

Information

Parameters

Type	Name	Default	Description
Temperature	TRoo	20 + 273.15	Room temperature [K]
Power	Q_flow_nominal	500	Nominal power [W]
Temperature	T_a_nominal	273.15 + 40	Radiator inlet temperature at nominal condition [K]
Temperature	T_b_nominal	273.15 + 30	Radiator outlet temperature at nominal condition [K]
MassFlowRate	m_flow_nominal	Q_flow_nominal/(T_a_nominal ...	Nominal mass flow rate [kg/s]
Pressure	dp_nominal	3000	Pressure drop at m_flow_nominal [Pa]

Modelica definition

model RadiatorEN442_2 "Test model for radiator"
  extends Modelica.Icons.Example;
 package Medium = Buildings.Media.ConstantPropertyLiquidWater "Medium model";
 parameter Modelica.SIunits.Temperature TRoo = 20+273.15 "Room temperature";
 parameter Modelica.SIunits.Power Q_flow_nominal = 500 "Nominal power";
  parameter Modelica.SIunits.Temperature T_a_nominal=273.15 + 40 
    "Radiator inlet temperature at nominal condition";
 parameter Modelica.SIunits.Temperature T_b_nominal = 273.15+30 
    "Radiator outlet temperature at nominal condition";
 parameter Modelica.SIunits.MassFlowRate m_flow_nominal=
    Q_flow_nominal/(T_a_nominal-T_b_nominal)/Medium.cp_const 
    "Nominal mass flow rate";
 parameter Modelica.SIunits.Pressure dp_nominal = 3000 
    "Pressure drop at m_flow_nominal";

  Buildings.Fluid.Sources.Boundary_pT sou(
    nPorts=2,
    redeclare package Medium = Medium,
    use_p_in=true,
    T=T_a_nominal);
  Fluid.FixedResistances.FixedResistanceDpM res2(
    redeclare package Medium = Medium,
    m_flow_nominal=m_flow_nominal,
    dp_nominal=dp_nominal);
  Fluid.FixedResistances.FixedResistanceDpM res1(
    redeclare package Medium = Medium,
    m_flow_nominal=m_flow_nominal,
    dp_nominal=dp_nominal);
  Buildings.Fluid.Sources.Boundary_pT sin(
    redeclare package Medium = Medium,
    nPorts=2,
    p(displayUnit="Pa") = 300000,
    T=T_b_nominal) "Sink";
  inner Modelica.Fluid.System system;
  Buildings.Fluid.HeatExchangers.Radiators.RadiatorEN442_2 rad1(redeclare 
      package Medium =
               Medium,
    T_a_nominal=T_a_nominal,
    T_b_nominal=T_b_nominal,
    Q_flow_nominal=Q_flow_nominal,
    TAir_nominal=TRoo) "Radiator";
  Buildings.Fluid.HeatExchangers.Radiators.RadiatorEN442_2 rad2(
    redeclare package Medium = Medium,
    energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
    T_a_nominal=T_a_nominal,
    T_b_nominal=T_b_nominal,
    Q_flow_nominal=Q_flow_nominal,
    TAir_nominal=TRoo) "Radiator";
  Buildings.HeatTransfer.Sources.FixedTemperature TBCCon1(T=TRoo);
  Buildings.HeatTransfer.Sources.FixedTemperature TBCCon2(T=TRoo);
  Modelica.Blocks.Sources.Step step(
    startTime=3600,
    offset=300000 + dp_nominal,
    height=-dp_nominal);
  Buildings.HeatTransfer.Sources.FixedTemperature TBCRad2(T=TRoo);
  Buildings.HeatTransfer.Sources.FixedTemperature TBCRad1(T=TRoo);
equation 
  connect(sou.ports[1], rad1.port_a);
  connect(sou.ports[2], rad2.port_a);
  connect(rad1.port_b, res1.port_a);
  connect(rad2.port_b, res2.port_a);
  connect(res1.port_b, sin.ports[1]);
  connect(res2.port_b, sin.ports[2]);
  connect(step.y, sou.p_in);
  connect(TBCRad2.port, rad2.heatPortRad);
  connect(TBCRad1.port, rad1.heatPortRad);
  connect(TBCCon2.port, rad2.heatPortCon);
  connect(TBCCon1.port, rad1.heatPortCon);
end RadiatorEN442_2;