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;