Buildings.Fluid.Movers.Examples.BaseClasses

Information

Package Content

Name	Description
FlowMachine_ZeroFlow	Base class to test flow machines with zero flow rate
ControlledFlowMachine

Buildings.Fluid.Movers.Examples.BaseClasses.FlowMachine_ZeroFlow

Information

Parameters

Type	Name	Default	Description
MassFlowRate	m_flow_nominal	1	Nominal mass flow rate [kg/s]
Pressure	dp_nominal	500	Nominal pressure difference [Pa]
PartialFlowMachine	floMacSta	redeclare Buildings.Fluid.Mo...	Static model of a flow machine
PartialFlowMachine	floMacDyn	redeclare Buildings.Fluid.Mo...	Dynamic model of a flow machine

Modelica definition

partial model FlowMachine_ZeroFlow 
  "Base class to test flow machines with zero flow rate"
  import Buildings;

  package Medium = Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated;

  inner Modelica.Fluid.System system;

  parameter Modelica.SIunits.MassFlowRate m_flow_nominal= 1 
    "Nominal mass flow rate";
  parameter Modelica.SIunits.Pressure dp_nominal = 500 
    "Nominal pressure difference";

  Modelica.Blocks.Sources.Ramp y(
    offset=1,
    duration=0.5,
    startTime=0.25,
    height=-1) "Input signal";
  Buildings.Fluid.Sources.Boundary_pT sou(
    redeclare package Medium = Medium,
    use_p_in=false,
    p=system.p_ambient,
    T=293.15,
    nPorts=4);
  Buildings.Fluid.FixedResistances.FixedResistanceDpM dpSta(
    redeclare package Medium = Medium,
    m_flow_nominal=m_flow_nominal,
    dp_nominal=dp_nominal) "Pressure drop";
  replaceable Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine floMacSta(
    redeclare package Medium = Medium,
    dynamicBalance=false,
    m_flow_nominal=1) constrainedby 
    Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine 
    "Static model of a flow machine";
  replaceable Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine floMacDyn(
    redeclare package Medium = Medium,
    m_flow_nominal=1,
    dynamicBalance=true) constrainedby 
    Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine 
    "Dynamic model of a flow machine";
  Buildings.Fluid.FixedResistances.FixedResistanceDpM dpDyn(
    redeclare package Medium = Medium,
    m_flow_nominal=m_flow_nominal,
    dp_nominal=dp_nominal) "Pressure drop";
  Modelica.Blocks.Math.Gain gain "Gain for input signal";
equation 
  connect(floMacSta.port_b, dpSta.port_a);
  connect(y.y, gain.u);
  connect(sou.ports[1], floMacSta.port_a);
  connect(dpSta.port_b, sou.ports[2]);
  connect(sou.ports[3], floMacDyn.port_a);
  connect(floMacDyn.port_b, dpDyn.port_a);
  connect(dpDyn.port_b, sou.ports[4]);
end FlowMachine_ZeroFlow;

Buildings.Fluid.Movers.Examples.BaseClasses.ControlledFlowMachine

Information

Modelica definition

model ControlledFlowMachine
  import Buildings;

  package Medium = Buildings.Media.IdealGases.SimpleAir;

  Modelica.Blocks.Sources.Trapezoid y(
    rising=0.1,
    width=0.1,
    falling=0.1,
    period=0.5,
    startTime=0,
    offset=0,
    amplitude=1);
  Buildings.Fluid.Sources.Boundary_pT sou(
    redeclare package Medium = Medium,
    use_p_in=false,
    p=system.p_ambient,
    T=293.15,
    nPorts=4);
  inner Modelica.Fluid.System system;
  Buildings.Fluid.Sensors.MassFlowRate masFloRat1(redeclare package Medium =
        Medium);
  Buildings.Fluid.Sensors.RelativePressure relPre(redeclare package Medium =
        Medium);
  Buildings.Fluid.Movers.FlowMachine_y fan1(
    redeclare package Medium = Medium,
    redeclare function flowCharacteristic =
        Buildings.Fluid.Movers.BaseClasses.Characteristics.quadraticFlow (
          V_flow_nominal={0,1.8,3}, dp_nominal={1000,600,0}),
    m_flow_nominal=6000/3600*1.2,
    dynamicBalance=false);
  FixedResistances.FixedResistanceDpM dp1(
    m_flow_nominal=6000/3600*1.2,
    redeclare package Medium = Medium,
    dp_nominal=300) "Pressure drop";
  FixedResistances.FixedResistanceDpM dp2(
    m_flow_nominal=6000/3600*1.2,
    redeclare package Medium = Medium,
    dp_nominal=300) "Pressure drop";
  Buildings.Fluid.Sensors.MassFlowRate masFloRat2(redeclare package Medium =
        Medium);
  FixedResistances.FixedResistanceDpM dp3(
    m_flow_nominal=6000/3600*1.2,
    redeclare package Medium = Medium,
    dp_nominal=300) "Pressure drop";
  Buildings.Fluid.Sensors.MassFlowRate masFloRat3(redeclare package Medium =
        Medium);
  Buildings.Fluid.Movers.FlowMachine_dp fan3(
    redeclare package Medium = Medium,
    m_flow_nominal=6000/3600*1.2,
    dynamicBalance=false);
  Buildings.Fluid.Movers.FlowMachine_m_flow fan2(
    redeclare package Medium = Medium,
    m_flow_nominal=6000/3600*1.2,
    dynamicBalance=false);
  FixedResistances.FixedResistanceDpM dp4(
    m_flow_nominal=6000/3600*1.2,
    redeclare package Medium = Medium,
    dp_nominal=300) "Pressure drop";
  Buildings.Fluid.Sensors.MassFlowRate masFloRat4(redeclare package Medium =
        Medium);
  Buildings.Fluid.Movers.FlowMachine_Nrpm fan4(
    redeclare package Medium = Medium,
    redeclare function flowCharacteristic =
        Buildings.Fluid.Movers.BaseClasses.Characteristics.quadraticFlow (
          V_flow_nominal={0,1.8,3}, dp_nominal={1000,600,0}),
    m_flow_nominal=6000/3600*1.2,
    dynamicBalance=false);
  Modelica.Blocks.Math.Gain gain(k=1500) "Converts y to nominal rpm";
  FixedResistances.FixedResistanceDpM dp5(
    m_flow_nominal=6000/3600*1.2,
    redeclare package Medium = Medium,
    dp_nominal=300) "Pressure drop";
  FixedResistances.FixedResistanceDpM dp6(
    m_flow_nominal=6000/3600*1.2,
    redeclare package Medium = Medium,
    dp_nominal=300) "Pressure drop";
  FixedResistances.FixedResistanceDpM dp7(
    m_flow_nominal=6000/3600*1.2,
    redeclare package Medium = Medium,
    dp_nominal=300) "Pressure drop";
  FixedResistances.FixedResistanceDpM dp8(
    m_flow_nominal=6000/3600*1.2,
    redeclare package Medium = Medium,
    dp_nominal=300) "Pressure drop";
  Buildings.Fluid.Sources.Boundary_pT sin(
    redeclare package Medium = Medium,
    use_p_in=false,
    p=system.p_ambient,
    T=293.15,
    nPorts=4);
  Modelica.Blocks.Nonlinear.Limiter limiter(uMax=1, uMin=0);
equation 

  connect(fan1.port_a, relPre.port_b);
  connect(fan1.port_b, relPre.port_a);
  connect(fan1.port_b, dp1.port_a);
  connect(fan2.port_b, dp2.port_a);
  connect(fan3.port_b, dp3.port_a);
  connect(fan4.port_b, dp4.port_a);
  connect(gain.y, fan4.Nrpm);
  connect(masFloRat1.m_flow, fan2.m_flow_in);
  connect(relPre.p_rel, fan3.dp_in);
  connect(sou.ports[1], masFloRat4.port_a);
  connect(sou.ports[2], masFloRat1.port_a);
  connect(sou.ports[3], masFloRat2.port_a);
  connect(sou.ports[4], masFloRat3.port_a);
  connect(dp4.port_b, sin.ports[1]);
  connect(dp1.port_b, sin.ports[2]);
  connect(dp2.port_b, sin.ports[3]);
  connect(dp3.port_b, sin.ports[4]);
  connect(masFloRat4.port_b, dp8.port_a);
  connect(dp8.port_b, fan4.port_a);
  connect(masFloRat1.port_b, dp5.port_a);
  connect(dp5.port_b, fan1.port_a);
  connect(masFloRat2.port_b, dp6.port_a);
  connect(dp6.port_b, fan2.port_a);
  connect(masFloRat3.port_b, dp7.port_a);
  connect(dp7.port_b, fan3.port_a);
  connect(y.y, limiter.u);
  connect(limiter.y, fan1.y);
  connect(limiter.y, gain.u);
end ControlledFlowMachine;