Buildings.Fluids.Chillers.Examples

Information

Extends from Buildings.BaseClasses.BaseIconExamples (Icon for Examples packages).

Package Content

Name	Description
Carnot	Test model for chiller based on Carnot efficiency

Buildings.Fluids.Chillers.Examples.Carnot

Parameters

Type	Name	Default	Description
Power	P_nominal	10E3	Nominal compressor power (at y=1) [W]
TemperatureDifference	dTEva_nominal	10	Temperature difference evaporator inlet-outlet [K]
TemperatureDifference	dTCon_nominal	10	Temperature difference condenser outlet-inlet [K]
Real	COPc	3	Chiller COP
MassFlowRate	m1_flow_nominal	P_nominal*(COPc + 1)/dTEva_n...	Nominal mass flow rate at evaporator [kg/s]
MassFlowRate	m2_flow_nominal	m1_flow_nominal*COPc/(COPc +...	Nominal mass flow rate at condenser [kg/s]

Modelica definition

model Carnot "Test model for chiller based on Carnot efficiency"
  import Buildings;
 package Medium1 = Modelica.Media.Water.ConstantPropertyLiquidWater 
    "Medium model";
 package Medium2 = Modelica.Media.Water.ConstantPropertyLiquidWater 
    "Medium model";

  parameter Modelica.SIunits.Power P_nominal=10E3 
    "Nominal compressor power (at y=1)";
  parameter Modelica.SIunits.TemperatureDifference dTEva_nominal=10 
    "Temperature difference evaporator inlet-outlet";
  parameter Modelica.SIunits.TemperatureDifference dTCon_nominal=10 
    "Temperature difference condenser outlet-inlet";
  parameter Real COPc = 3 "Chiller COP";
  parameter Modelica.SIunits.MassFlowRate m1_flow_nominal=
     P_nominal*(COPc+1)/dTEva_nominal/4200 
    "Nominal mass flow rate at evaporator";
  parameter Modelica.SIunits.MassFlowRate m2_flow_nominal=
     m1_flow_nominal*COPc/(COPc+1) "Nominal mass flow rate at condenser";

  Buildings.Fluids.Chillers.Carnot chi(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    P_nominal=P_nominal,
    dTEva_nominal=dTEva_nominal,
    dTCon_nominal=dTCon_nominal,
    COP_nominal=COPc,
    use_eta_Carnot=true,
    etaCar=0.3,
    dp1_nominal=6000,
    dp2_nominal=6000,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal) "Chiller model";
  Modelica_Fluid.Sources.MassFlowSource_T sou1(nPorts=1,
    redeclare package Medium = Medium1,
    use_T_in=true,
    m_flow=m1_flow_nominal,
    T=298.15);
  Modelica_Fluid.Sources.MassFlowSource_T sou2(nPorts=1,
    redeclare package Medium = Medium2,
    use_T_in=true,
    m_flow=m2_flow_nominal,
    T=291.15);
  Modelica_Fluid.Sources.FixedBoundary sin1(nPorts=1, redeclare package Medium
      = Medium1);
  Modelica_Fluid.Sources.FixedBoundary sin2(nPorts=1, redeclare package Medium
      = Medium2);
  Modelica.Blocks.Sources.Ramp uCom(
    height=-1,
    duration=60,
    offset=1,
    startTime=1800) "Compressor control signal";
  inner Modelica_Fluid.System system;
  Modelica.Blocks.Sources.Ramp TEva_in(
    height=10,
    duration=60,
    offset=273.15 + 20,
    startTime=60) "Evaporator inlet temperature";
  Modelica.Blocks.Sources.Ramp TCon_in(
    height=10,
    duration=60,
    startTime=900,
    offset=273.15 + 10) "Condenser inlet temperature";
equation 
  connect(sou1.ports[1], chi.port_a1);
  connect(sou2.ports[1], chi.port_a2);
  connect(chi.port_b1, sin1.ports[1]);
  connect(sin2.ports[1], chi.port_b2);
  connect(TEva_in.y, sou1.T_in);
  connect(TCon_in.y, sou2.T_in);
  connect(uCom.y, chi.y);
end Carnot;