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Buildings.Fluid.HeatExchangers.Radiators.Examples

Collection of models that illustrate model use and test models

Information

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

Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).

Package Content

Name Description
Buildings.Fluid.HeatExchangers.Radiators.Examples.RadiatorEN442_2 RadiatorEN442_2 Test model for radiator

Buildings.Fluid.HeatExchangers.Radiators.Examples.RadiatorEN442_2 Buildings.Fluid.HeatExchangers.Radiators.Examples.RadiatorEN442_2

Test model for radiator

Buildings.Fluid.HeatExchangers.Radiators.Examples.RadiatorEN442_2

Information

This test model compares the radiator model when used as a steady-state and a dynamic model.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

TypeNameDefaultDescription
TemperatureTRoo20 + 273.15Room temperature [K]
PowerQ_flow_nominal500Nominal power [W]
TemperatureT_a_nominal313.15Radiator inlet temperature at nominal condition [K]
TemperatureT_b_nominal303.15Radiator outlet temperature at nominal condition [K]
MassFlowRatem_flow_nominalQ_flow_nominal/(T_a_nominal ...Nominal mass flow rate [kg/s]
PressureDifferencedp_nominal3000Pressure drop at m_flow_nominal [Pa]

Modelica definition

model RadiatorEN442_2 "Test model for radiator" extends Modelica.Icons.Example; package Medium = Buildings.Media.Water "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=313.15 "Radiator inlet temperature at nominal condition"; parameter Modelica.SIunits.Temperature T_b_nominal = 303.15 "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.PressureDifference 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"; 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, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "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;

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