modelBaseMultiPortModule

Extends from dhcSim.Fluid.Interfaces.LumpedMultiVolumeDeclarations (Declarations for multiple lumped volumes), Buildings.Fluid.Interfaces.TwoPortFlowResistanceParameters (Parameters for flow resistance for models with two ports).

Parameters

TypeNameDefaultDescription
IntegernLev (from LumpedMultiVolumeDeclarations)2Number of grid levels
Medium.SpecificEnthalpyh_start (from LumpedMultiVolumeDeclarations)Medium.specificEnthalpy(state = Medium.setState_pTX(p = p_start, T = T_start, X = X_start))
Dynamics › Equations
Modelica.Fluid.Types.DynamicsenergyDynamics (from LumpedMultiVolumeDeclarations)Modelica.Fluid.Types.Dynamics.DynamicFreeInitialType of energy balance: dynamic (3 initialization options) or steady state
Modelica.Fluid.Types.DynamicsmassDynamics (from LumpedMultiVolumeDeclarations)energyDynamicsType of mass balance: dynamic (3 initialization options) or steady state
Modelica.Fluid.Types.DynamicssubstanceDynamics (from LumpedMultiVolumeDeclarations)energyDynamicsType of independent mass fraction balance: dynamic (3 initialization options) or steady state
Modelica.Fluid.Types.DynamicstraceDynamics (from LumpedMultiVolumeDeclarations)energyDynamicsType of trace substance balance: dynamic (3 initialization options) or steady state
Initialization
Modelica.SIunits.AbsolutePressurep_start (from LumpedMultiVolumeDeclarations)fill(Medium.p_default, nLev)Start value of pressure
Modelica.SIunits.TemperatureT_start (from LumpedMultiVolumeDeclarations)fill(Medium.T_default, nLev)Start value of temperature
Medium.MassFractionX_start (from LumpedMultiVolumeDeclarations)fill(Medium.X_default, nLev)Start value of mass fractions m_i/m
Medium.ExtraPropertyC_start (from LumpedMultiVolumeDeclarations)fill(0, nLev, Medium.nC)Start value of trace substances
Medium.ExtraPropertyC_nominal (from LumpedMultiVolumeDeclarations)fill(1E-2, nLev, Medium.nC)Nominal value of trace substances. (Set to typical order of magnitude.)
Dynamics
RealmSenFac (from LumpedMultiVolumeDeclarations)1Factor for scaling the sensible thermal mass of the volume
Modelica.SIunits.Timetau10Time constant at nominal flow for dynamic energy and momentum balance
Flow resistance
BooleancomputeFlowResistance (from TwoPortFlowResistanceParameters)true=true, compute flow resistance. Set to false to assume no friction
Booleanfrom_dp (from TwoPortFlowResistanceParameters)false= true, use m_flow = f(dp) else dp = f(m_flow)
BooleanlinearizeFlowResistance (from TwoPortFlowResistanceParameters)false= true, use linear relation between m_flow and dp for any flow rate
RealdeltaM (from TwoPortFlowResistanceParameters)0.1Fraction of nominal flow rate where flow transitions to laminar
Nominal condition
Modelica.Units.SI.PressureDifferencedp_nominal (from TwoPortFlowResistanceParameters)Pressure difference
Modelica.SIunits.MassFlowRatem_flow_nominal10Nominal mass flow rate
Assumptions
BooleanallowFlowReversaltrue= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
Advanced
Medium.MassFlowRatem_flow_small1E-4*abs(m_flow_nominal)Small mass flow rate for regularization of zero flow
Advanced › Diagnostics
Booleanshow_Tfalse= true, if actual temperature at port is computed

Connectors

TypeNameDefaultDescription
Modelica.Fluid.Interfaces.FluidPorts_aports_aFluid connector a (positive design flow direction is from port_a to port_b)
Modelica.Fluid.Interfaces.FluidPorts_bports_bFluid connector b (positive design flow direction is from port_a to port_b)