Buildings.Fluid.MixingVolumes.BaseClasses

Information

Package Content

Name	Description
ClosedVolume	Volume of fixed size, closed to the ambient, with inlet/outlet ports
PartialLumpedVessel	Lumped volume with a vector of fluid ports and replaceable heat transfer model
PartialMixingVolumeWaterPort	Partial mixing volume that allows adding or subtracting water vapor

Buildings.Fluid.MixingVolumes.BaseClasses.ClosedVolume

Information

Ideally mixed volume of constant size with two fluid ports and one medium model. The flow properties are computed from the upstream quantities, pressures are equal in both nodes and the medium model if use_portsData=false. Heat transfer through a thermal port is possible, it equals zero if the port remains unconnected. A spherical shape is assumed for the heat transfer area, with V=4/3*pi*r^3, A=4*pi*r^2. Ideal heat transfer is assumed per default; the thermal port temperature is equal to the medium temperature.

If use_portsData=true, the port pressures represent the pressures just after the outlet (or just before the inlet) in the attached pipe. The hydraulic resistances portsData.zeta_in and portsData.zeta_out determine the dissipative pressure drop between volume and port depending on the direction of mass flow. See VesselPortsData and [Idelchik, Handbook of Hydraulic Resistance, 2004].

Note: This model is identical to Modelica.Fluid.Vessels.ClosedVolume, except that is extends Buildings.Fluid.MixingVolumes.BaseClasses.PartialLumpedVessel instead of Modelica.Fluid.Vessels.BaseClasses.PartialLumpedVessel to avoid an assert statement.

Extends from Buildings.Fluid.MixingVolumes.BaseClasses.PartialLumpedVessel (Lumped volume with a vector of fluid ports and replaceable heat transfer model).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium in the component
Volume	fluidVolume	V	Volume [m3]
Volume	V		Volume [m3]
Ports
Boolean	use_portsData	true	= false to neglect pressure loss and kinetic energy
VesselPortsData	portsData[nPorts]		Data of inlet/outlet ports
Assumptions
Dynamics
Dynamics	energyDynamics	system.energyDynamics	Formulation of energy balance
Dynamics	massDynamics	system.massDynamics	Formulation of mass balance
Dynamics	substanceDynamics	energyDynamics	Formulation of substance balance
Dynamics	traceDynamics	energyDynamics	Formulation of trace substance balance
Heat transfer
Boolean	use_HeatTransfer	false	= true to use the HeatTransfer model
replaceable model HeatTransfer		IdealHeatTransfer	Wall heat transfer
Initialization
AbsolutePressure	p_start	system.p_start	Start value of pressure [Pa]
Boolean	use_T_start	true	= true, use T_start, otherwise h_start
Temperature	T_start	if use_T_start then system.T...	Start value of temperature [K]
SpecificEnthalpy	h_start	if use_T_start then Medium.s...	Start value of specific enthalpy [J/kg]
MassFraction	X_start[Medium.nX]	Medium.X_default	Start value of mass fractions m_i/m [kg/kg]
ExtraProperty	C_start[Medium.nC]	fill(0, Medium.nC)	Start value of trace substances
Advanced
Port properties
MassFlowRate	m_flow_small	system.m_flow_small	Regularization range at zero mass flow rate [kg/s]

Connectors

Type	Name	Description
VesselFluidPorts_b	ports[nPorts]	Fluid inlets and outlets
HeatPort_a	heatPort

Modelica definition

model ClosedVolume 
  "Volume of fixed size, closed to the ambient, with inlet/outlet ports"
  import Modelica.Constants.pi;

  // Mass and energy balance, ports
  extends Buildings.Fluid.MixingVolumes.BaseClasses.PartialLumpedVessel(
    final fluidVolume = V,
    vesselArea = pi*(3/4*V)^(2/3),
    heatTransfer(surfaceAreas={4*pi*(3/4*V/pi)^(2/3)}));

  parameter Modelica.SIunits.Volume V "Volume";

equation 
  Wb_flow = 0;
  for i in 1:nPorts loop
    vessel_ps_static[i] = medium.p;
  end for;

end ClosedVolume;

Buildings.Fluid.MixingVolumes.BaseClasses.PartialLumpedVessel

Information

This base class extends PartialLumpedVolume with a vector of fluid ports and a replaceable wall HeatTransfer model.

The following modeling assumption are made:

• homogenous medium, i.e. phase seperation is not taken into account,
• no kinetic energy in the fluid, i.e. kinetic energy dissipates into the internal energy,
• pressure loss definitions at vessel ports assume incompressible fluid,
• outflow of ambient media is prevented at each port assuming check valve behavior. If fluidlevel < portsData_height[i] and   ports[i].p < vessel_ps_static[i] massflow at the port is set to 0.

The following variables need to be defined by an extending model:

• input fluidVolume, the volume of the fluid in the vessel,
• vessel_ps_static[nPorts], the static pressures inside the vessel at the height of the corresponding ports, at zero flow velocity, and
• Wb_flow, work term of the energy balance, e.g. p*der(V) if the volume is not constant or stirrer power.

• parameter vesselArea (default: Modelica.Constants.inf m2), the area of the vessel, to be related to cross flow areas of the ports for the consideration of dynamic pressure effects.

• input fluidLevel (default: 0m), the level the fluid in the vessel, and
• parameter fluidLevel_max (default: 1m), the maximum level that must not be exceeded. Ports at or above fluidLevel_max can only receive inflow.

• portsData_diameter[nPorts]
,
• portsData_height[nPorts]
,
• portsData_zeta_in[nPorts]
, and
• portsData_zeta_out[nPorts]

Note: This model is identical to Modelica.Fluid.Vessels.BaseClasses.PartialLumpedVessel, except that it extends Buildings.Fluid.Interfaces.PartialLumpedVolume instead of Modelica.Fluid.Interfaces.PartialLumpedVolume to avoid the assert statement.

Extends from Buildings.Fluid.Interfaces.PartialLumpedVolume (Lumped volume with mass and energy balance).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium in the component
Ports
Boolean	use_portsData	true	= false to neglect pressure loss and kinetic energy
VesselPortsData	portsData[nPorts]		Data of inlet/outlet ports
Assumptions
Dynamics
Dynamics	energyDynamics	system.energyDynamics	Formulation of energy balance
Dynamics	massDynamics	system.massDynamics	Formulation of mass balance
Dynamics	substanceDynamics	energyDynamics	Formulation of substance balance
Dynamics	traceDynamics	energyDynamics	Formulation of trace substance balance
Heat transfer
Boolean	use_HeatTransfer	false	= true to use the HeatTransfer model
Initialization
AbsolutePressure	p_start	system.p_start	Start value of pressure [Pa]
Boolean	use_T_start	true	= true, use T_start, otherwise h_start
Temperature	T_start	if use_T_start then system.T...	Start value of temperature [K]
SpecificEnthalpy	h_start	if use_T_start then Medium.s...	Start value of specific enthalpy [J/kg]
MassFraction	X_start[Medium.nX]	Medium.X_default	Start value of mass fractions m_i/m [kg/kg]
ExtraProperty	C_start[Medium.nC]	fill(0, Medium.nC)	Start value of trace substances
Advanced
Port properties
MassFlowRate	m_flow_small	system.m_flow_small	Regularization range at zero mass flow rate [kg/s]

Connectors

Type	Name	Description
VesselFluidPorts_b	ports[nPorts]	Fluid inlets and outlets
HeatPort_a	heatPort

Modelica definition

partial model PartialLumpedVessel 
  "Lumped volume with a vector of fluid ports and replaceable heat transfer model"
  extends Buildings.Fluid.Interfaces.PartialLumpedVolume;

  // Port definitions
  parameter Integer nPorts=0 "Number of ports";
  Modelica.Fluid.Vessels.BaseClasses.VesselFluidPorts_b ports[nPorts](
      redeclare each package Medium = Medium) "Fluid inlets and outlets";

  // Port properties
  parameter Boolean use_portsData=true 
    "= false to neglect pressure loss and kinetic energy";
  parameter Modelica.Fluid.Vessels.BaseClasses.VesselPortsData[nPorts]
    portsData if use_portsData "Data of inlet/outlet ports";

  parameter Modelica.SIunits.MassFlowRate m_flow_small(min=0)=system.m_flow_small 
    "Regularization range at zero mass flow rate";
/*
  parameter Medium.AbsolutePressure dp_small = system.dp_small
    "Turbulent flow if |dp| >= dp_small (regularization of zero flow)"
    annotation(Dialog(tab="Advanced",group="Ports"));
*/
  Medium.EnthalpyFlowRate ports_H_flow[nPorts];
  Medium.MassFlowRate ports_mXi_flow[nPorts,Medium.nXi];
  Medium.MassFlowRate[Medium.nXi] sum_ports_mXi_flow 
    "Substance mass flows through ports";
  Medium.ExtraPropertyFlowRate ports_mC_flow[nPorts,Medium.nC];
  Medium.ExtraPropertyFlowRate[Medium.nC] sum_ports_mC_flow 
    "Trace substance mass flows through ports";

  // Heat transfer through boundary
  parameter Boolean use_HeatTransfer = false 
    "= true to use the HeatTransfer model";
  replaceable model HeatTransfer = 
      Modelica.Fluid.Vessels.BaseClasses.HeatTransfer.IdealHeatTransfer 
    constrainedby 
    Modelica.Fluid.Vessels.BaseClasses.HeatTransfer.PartialVesselHeatTransfer 
    "Wall heat transfer";
  HeatTransfer heatTransfer(
    redeclare final package Medium = Medium,
    final n=1,
    final states = {medium.state},
    final use_k = use_HeatTransfer);
  Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a heatPort if use_HeatTransfer;

  // Conservation of kinetic energy
  Medium.Density[nPorts] portDensities 
    "densites of the fluid at the device boudary";
  Modelica.SIunits.Velocity[nPorts] portVelocities 
    "velocities of fluid flow at device boundary";
  Modelica.SIunits.EnergyFlowRate[nPorts] ports_E_flow 
    "flow of kinetic and potential energy at device boundary";

  // Note: should use fluidLevel_start - portsData.height
  Real[nPorts] s(each start = fluidLevel_max) 
    "curve parameters for port flows vs. port pressures; for further details see, Modelica Tutorial: Ideal switching devices";
  Real[nPorts] ports_penetration 
    "penetration of port with fluid, depending on fluid level and port diameter";

  // treatment of pressure losses at ports
  Modelica.SIunits.Area[nPorts] portAreas={Modelica.Constants.pi/4*
      portsData_diameter[i]^2 for i in 1:nPorts};
  Medium.AbsolutePressure[nPorts] vessel_ps_static 
    "static pressures inside the vessel at the height of the corresponding ports, zero flow velocity";
protected 
  input Modelica.SIunits.Height fluidLevel=0 
    "level of fluid in the vessel for treating heights of ports";
  parameter Modelica.SIunits.Height fluidLevel_max=1 
    "maximum level of fluid in the vessel";
  parameter Modelica.SIunits.Area vesselArea=Modelica.Constants.inf 
    "Area of the vessel used to relate to cross flow area of ports";

  // Treatment of use_portsData=false to neglect portsData and to not require its specification either in this case.
  // Remove portsData conditionally if use_portsData=false. Simplify their use in model equations by always
  // providing portsData_diameter and portsData_height, independend of the use_portsData setting.
  // Note: this moreover serves as work-around if a tool does not support a zero sized portsData record.
  Modelica.Blocks.Interfaces.RealInput[nPorts] portsData_diameter_internal = portsData.diameter if use_portsData and nPorts > 0;
  Modelica.Blocks.Interfaces.RealInput[nPorts] portsData_height_internal = portsData.height if use_portsData and nPorts > 0;
  Modelica.Blocks.Interfaces.RealInput[nPorts] portsData_zeta_in_internal = portsData.zeta_in if use_portsData and nPorts > 0;
  Modelica.Blocks.Interfaces.RealInput[nPorts] portsData_zeta_out_internal = portsData.zeta_out if use_portsData and nPorts > 0;
  Modelica.Blocks.Interfaces.RealInput[nPorts] portsData_diameter;
  Modelica.Blocks.Interfaces.RealInput[nPorts] portsData_height;
  Modelica.Blocks.Interfaces.RealInput[nPorts] portsData_zeta_in;
  Modelica.Blocks.Interfaces.RealInput[nPorts] portsData_zeta_out;

equation 
  mb_flow = sum(ports.m_flow);
  mbXi_flow = sum_ports_mXi_flow;
  mbC_flow  = sum_ports_mC_flow;
  Hb_flow = sum(ports_H_flow) + sum(ports_E_flow);
  Qb_flow = heatTransfer.Q_flows[1];

  // Only one connection allowed to a port to avoid unwanted ideal mixing
  for i in 1:nPorts loop
    assert(cardinality(ports[i]) <= 1,"
each ports[i] of volume can at most be connected to one component.
If two or more connections are present, ideal mixing takes
place with these connections, which is usually not the intention
of the modeller. Increase nPorts to add an additional port.
");
  end for;
  // Check for correct solution
  assert(fluidLevel <= fluidLevel_max, "Vessel is overflowing (fluidLevel > fluidLevel_max = " + String(fluidLevel) + ")");
  assert(fluidLevel > -1e-6*fluidLevel_max, "Fluid level (= " + String(fluidLevel) + ") is below zero meaning that the solution failed.");

  // Boundary conditions

  // treatment of conditional portsData
  connect(portsData_diameter, portsData_diameter_internal);
  connect(portsData_height, portsData_height_internal);
  connect(portsData_zeta_in, portsData_zeta_in_internal);
  connect(portsData_zeta_out, portsData_zeta_out_internal);
  if not use_portsData then
    portsData_diameter = zeros(nPorts);
    portsData_height = zeros(nPorts);
    portsData_zeta_in = zeros(nPorts);
    portsData_zeta_out = zeros(nPorts);
  end if;

  // actual definition of port variables
  for i in 1:nPorts loop
    if use_portsData then
      // dp = 0.5*zeta*d*v*|v|
      // Note: assume vessel_ps_static for portDensities to avoid algebraic loops for ports.p
      portDensities[i] = noEvent(Medium.density(Medium.setState_phX(vessel_ps_static[i], actualStream(ports[i].h_outflow), actualStream(ports[i].Xi_outflow))));
      portVelocities[i] = smooth(0, ports[i].m_flow/portAreas[i]/portDensities[i]);
      // Note: the penetration should not go too close to zero as this would prevent a vessel from running empty
      ports_penetration[i] = Modelica.Fluid.Utilities.regStep(
        fluidLevel - portsData_height[i] - 0.1*portsData_diameter[i],
        1,
        1e-3,
        0.1*portsData_diameter[i]);
    else
      // an infinite port diameter is assumed
      portDensities[i] = medium.d;
      portVelocities[i] = 0;
      ports_penetration[i] = 1;
    end if;
    // fluid flow through ports
    if fluidLevel >= portsData_height[i] then
      // regular operation: fluidLevel is above ports[i]
      // Note: >= covers default values of zero as well
      if use_portsData then
        /* Without regularization
        ports[i].p = vessel_ps_static[i] + 0.5*ports[i].m_flow^2/portAreas[i]^2
                      * noEvent(if ports[i].m_flow>0 then zeta_in[i]/portDensities[i] else -zeta_out[i]/medium.d);
        */

        ports[i].p = vessel_ps_static[i] + (0.5/portAreas[i]^2*
          Modelica.Fluid.Utilities.regSquare2(
          ports[i].m_flow,
          m_flow_small,
          (portsData_zeta_in[i] - 1 + portAreas[i]^2/vesselArea^2)/
            portDensities[i]*ports_penetration[i],
          (portsData_zeta_out[i] + 1 - portAreas[i]^2/vesselArea^2)/medium.d/
            ports_penetration[i]));
        /*
        // alternative formulation m_flow=f(dp); not allowing the ideal portsData_zeta_in[i]=1 though
        ports[i].m_flow = smooth(2, portAreas[i]*Utilities.regRoot2(ports[i].p - vessel_ps_static[i], dp_small,
                                     2*portDensities[i]/portsData_zeta_in[i],
                                     2*medium.d/portsData_zeta_out[i]));
        */
      else
        ports[i].p = vessel_ps_static[i];
      end if;
      s[i] = fluidLevel - portsData_height[i];
    elseif s[i] > 0 or portsData_height[i] >= fluidLevel_max then
      // ports[i] is above fluidLevel and has inflow
      ports[i].p = vessel_ps_static[i];
      s[i] = ports[i].m_flow;
    else
      // ports[i] is above fluidLevel, preventing outflow
      ports[i].m_flow = 0;
      s[i] = (ports[i].p - vessel_ps_static[i])/Medium.p_default*(portsData_height[i] - fluidLevel);
    end if;

    ports[i].h_outflow  = medium.h;
    ports[i].Xi_outflow = medium.Xi;
    ports[i].C_outflow  = C;

    ports_H_flow[i] = ports[i].m_flow * actualStream(ports[i].h_outflow) 
      "Enthalpy flow";
    ports_E_flow[i] = ports[i].m_flow*(0.5*portVelocities[i]*portVelocities[i] + system.g*portsData_height[i]) 
      "Flow of kinetic and potential energy";
    ports_mXi_flow[i,:] = ports[i].m_flow * actualStream(ports[i].Xi_outflow) 
      "Component mass flow";
    ports_mC_flow[i,:]  = ports[i].m_flow * actualStream(ports[i].C_outflow) 
      "Trace substance mass flow";
  end for;

  for i in 1:Medium.nXi loop
    sum_ports_mXi_flow[i] = sum(ports_mXi_flow[:,i]);
  end for;

  for i in 1:Medium.nC loop
    sum_ports_mC_flow[i]  = sum(ports_mC_flow[:,i]);
  end for;

  connect(heatPort, heatTransfer.heatPorts[1]);


end PartialLumpedVessel;

Buildings.Fluid.MixingVolumes.BaseClasses.PartialMixingVolumeWaterPort

Information

This model represents the same physics as Modelica.Fluid.Vessels.Volume but in addition, it allows to connect signals for the water exchanged with the volume. The model is partial in order to allow a submodel that can be used with media that contain water as a substance, and a submodel that can be used with dry air. Having separate models is required because calls to the medium property function enthalpyOfLiquid results in a linker error if a medium such as Modelica.Media.Air.SimpleAir is used that does not implement this function.

Extends from Modelica.Fluid.Interfaces.PartialLumpedVolume (Lumped volume with mass and energy balance).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium in the component
Volume	fluidVolume	V	Volume [m3]
Volume	V		Volume [m3]
Assumptions
Dynamics
Dynamics	energyDynamics	system.energyDynamics	Formulation of energy balance
Dynamics	massDynamics	system.massDynamics	Formulation of mass balance
Heat transfer
Boolean	use_HeatTransfer	false	= true to use the HeatTransfer model
Initialization
AbsolutePressure	p_start	system.p_start	Start value of pressure [Pa]
Boolean	use_T_start	true	= true, use T_start, otherwise h_start
Temperature	T_start	if use_T_start then system.T...	Start value of temperature [K]
SpecificEnthalpy	h_start	if use_T_start then Medium.s...	Start value of specific enthalpy [J/kg]
MassFraction	X_start[Medium.nX]	Medium.X_default	Start value of mass fractions m_i/m [kg/kg]
ExtraProperty	C_start[Medium.nC]	fill(0, Medium.nC)	Start value of trace substances

Connectors

Type	Name	Description
FluidPorts_b	ports[nPorts]	Fluid outlets
HeatPort_a	heatPort
input RealInput	mWat_flow	Water flow rate added into the medium [kg/s]
input RealInput	TWat	Temperature of liquid that is drained from or injected into volume [K]
output RealOutput	XWat	Species composition of medium

Modelica definition

partial model PartialMixingVolumeWaterPort 
  "Partial mixing volume that allows adding or subtracting water vapor"
  extends Modelica.Fluid.Interfaces.PartialLumpedVolume(fluidVolume = V, m(start=V*rho_nominal, fixed=false));

// declarations similar than in PartialLumpedVolumePorts from Modelica.Fluid
  // Port definitions
  parameter Integer nPorts(min=1)=1 "Number of ports";
  Modelica.Fluid.Interfaces.FluidPorts_b ports[nPorts](
      redeclare each package Medium = Medium) "Fluid outlets";
  Medium.AbsolutePressure ports_p_static 
    "static pressure at the ports, inside the volume";

  Medium.EnthalpyFlowRate ports_H_flow[nPorts];
  Medium.MassFlowRate ports_mXi_flow[nPorts,Medium.nXi];
  Medium.MassFlowRate[Medium.nXi] sum_ports_mXi_flow 
    "Substance mass flows through ports";
  Medium.ExtraPropertyFlowRate ports_mC_flow[nPorts,Medium.nC];
  Medium.ExtraPropertyFlowRate[Medium.nC] sum_ports_mC_flow 
    "Trace substance mass flows through ports";

  // Heat transfer through boundary
  parameter Boolean use_HeatTransfer = false 
    "= true to use the HeatTransfer model";
  replaceable model HeatTransfer = 
      Modelica.Fluid.Vessels.BaseClasses.HeatTransfer.IdealHeatTransfer (
       surfaceAreas={4*Modelica.Constants.pi*(3/4*V/Modelica.Constants.pi)^(2/3)}) 
    constrainedby 
    Modelica.Fluid.Vessels.BaseClasses.HeatTransfer.PartialVesselHeatTransfer 
    "Wall heat transfer";
  HeatTransfer heatTransfer(
    redeclare final package Medium = Medium,
    final n=1,
    final states = {medium.state},
    final use_k = use_HeatTransfer);
  Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a heatPort if use_HeatTransfer;

 // additional declarations
  Modelica.Blocks.Interfaces.RealInput mWat_flow(final quantity="MassFlowRate",
                                                 final unit = "kg/s") 
    "Water flow rate added into the medium";
  Modelica.Blocks.Interfaces.RealInput TWat(final quantity="ThermodynamicTemperature",
                                            final unit = "K", displayUnit = "degC", min=260) 
    "Temperature of liquid that is drained from or injected into volume";
  Modelica.Blocks.Interfaces.RealOutput XWat "Species composition of medium";
  Medium.MassFlowRate mXi_flow[Medium.nXi] 
    "Mass flow rates of independent substances added to the medium";
  Modelica.SIunits.HeatFlowRate HWat_flow 
    "Enthalpy flow rate of extracted water";
   parameter Modelica.SIunits.Volume V "Volume";
protected 
   parameter Medium.ThermodynamicState sta0 = Medium.setState_pTX(T=T_start,
         p=p_start, X=X_start[1:Medium.nXi]);
   parameter Modelica.SIunits.Density rho_nominal=Medium.density(sta0) 
    "Density, used to compute fluid mass";
equation 
   assert(not (energyDynamics<>Modelica.Fluid.Types.Dynamics.SteadyState and 
        massDynamics==Modelica.Fluid.Types.Dynamics.SteadyState) or Medium.singleState,
          "Bad combination of dynamics options and Medium not conserving mass if fluidVolume is fixed.");

  ports_p_static = medium.p;

  connect(heatPort, heatTransfer.heatPorts[1]);
  Wb_flow = 0;

  mb_flow = sum(ports.m_flow) + mWat_flow 
    "eqn. differs from Modelica.Fluid implementation";
  mbXi_flow = sum_ports_mXi_flow + mXi_flow 
    "eqn. differs from Modelica.Fluid implementation";
  mbC_flow  = sum_ports_mC_flow;
  Hb_flow = sum(ports_H_flow) + HWat_flow 
    "eqn. differs from Modelica.Fluid implementation";
  Qb_flow = heatTransfer.Q_flows[1];

  // Only one connection allowed to a port to avoid unwanted ideal mixing
  for i in 1:nPorts loop
    assert(cardinality(ports[i]) <= 1,"
each ports[i] of volume can at most be connected to one component.
If two or more connections are present, ideal mixing takes
place with these connections, which is usually not the intention
of the modeller. Increase nPorts to add an additional port.
");
  end for;

  // Boundary conditions
  for i in 1:nPorts loop
    ports[i].p = ports_p_static;
  end for;
  ports.h_outflow = fill(medium.h,   nPorts);
  ports.Xi_outflow = fill(medium.Xi, nPorts);
  ports.C_outflow  = fill(C,         nPorts);

  for i in 1:nPorts loop
    ports_H_flow[i] = ports[i].m_flow * actualStream(ports[i].h_outflow) 
      "Enthalpy flow";
    ports_mXi_flow[i,:] = ports[i].m_flow * actualStream(ports[i].Xi_outflow) 
      "Component mass flow";
    ports_mC_flow[i,:]  = ports[i].m_flow * actualStream(ports[i].C_outflow) 
      "Trace substance mass flow";
  end for;
  for i in 1:Medium.nXi loop
    sum_ports_mXi_flow[i] = sum(ports_mXi_flow[:,i]);
  end for;
  for i in 1:Medium.nC loop
    sum_ports_mC_flow[i]  = sum(ports_mC_flow[:,i]);
  end for;

end PartialMixingVolumeWaterPort;

Buildings.Fluid.MixingVolumes.BaseClasses.PartialLumpedVessel.HeatTransfer

Parameters

Type	Name	Default	Description
Ambient
CoefficientOfHeatTransfer	k	0	Heat transfer coefficient to ambient [W/(m2.K)]
Temperature	T_ambient	system.T_ambient	Ambient temperature [K]
Internal Interface
replaceable package Medium		PartialMedium	Medium in the component
Integer	n	1	Number of heat transfer segments
Boolean	use_k	false	= true to use k value for thermal isolation

Connectors

Type	Name	Description
HeatPorts_a	heatPorts[n]	Heat port to component boundary

Modelica definition

replaceable model HeatTransfer = 
    Modelica.Fluid.Vessels.BaseClasses.HeatTransfer.IdealHeatTransfer 
  constrainedby 
  Modelica.Fluid.Vessels.BaseClasses.HeatTransfer.PartialVesselHeatTransfer 
  "Wall heat transfer";

Buildings.Fluid.MixingVolumes.BaseClasses.PartialMixingVolumeWaterPort.HeatTransfer

Parameters

Type	Name	Default	Description
Area	surfaceAreas[n]	{4*Modelica.Constants.pi*(3/...	Heat transfer areas [m2]
Ambient
CoefficientOfHeatTransfer	k	0	Heat transfer coefficient to ambient [W/(m2.K)]
Temperature	T_ambient	system.T_ambient	Ambient temperature [K]
Internal Interface
replaceable package Medium		PartialMedium	Medium in the component
Integer	n	1	Number of heat transfer segments
Boolean	use_k	false	= true to use k value for thermal isolation

Connectors

Type	Name	Description
HeatPorts_a	heatPorts[n]	Heat port to component boundary

Modelica definition

replaceable model HeatTransfer = 
    Modelica.Fluid.Vessels.BaseClasses.HeatTransfer.IdealHeatTransfer (
     surfaceAreas={4*Modelica.Constants.pi*(3/4*V/Modelica.Constants.pi)^(2/3)}) 
  constrainedby 
  Modelica.Fluid.Vessels.BaseClasses.HeatTransfer.PartialVesselHeatTransfer 
  "Wall heat transfer";