modelPartialConnection1Pipe

Partial model for connecting an agent to a one-pipe distribution network

Information

Partial model to be used for connecting an agent (e.g. energy transfer station) to a one-pipe distribution network.

Two instances of a replaceable partial model are used to represent the pipes:

One representing the main distribution pipe immediately upstream the connection.
The other one representing both the supply and return lines of the connection. When replacing that model with a pipe model computing the pressure drop, one must double the length so that both the supply and return lines are accounted for.

Type	Name	Default	Description
Boolean	show_entFlo	false	Set to true to output enthalpy flow rate difference
Boolean	show_TOut	false	Set to true to output temperature at connection outlet
Modelica.Units.SI.MassFlowRate	mDis_flow_nominal		Nominal mass flow rate in the distribution line
Modelica.Units.SI.MassFlowRate	mCon_flow_nominal		Nominal mass flow rate in the connection line
Assumptions
Boolean	allowFlowReversal	false	= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
Dynamics › Conservation equations
Modelica.Fluid.Types.Dynamics	energyDynamics	Modelica.Fluid.Types.Dynamics.FixedInitial	Type of energy balance: dynamic (3 initialization options) or steady state
Advanced › Dynamics
Modelica.Fluid.Types.Dynamics	massDynamics	energyDynamics	Type of mass balance: dynamic (3 initialization options) or steady state, must be steady state if energyDynamics is steady state
Dynamics › Nominal condition
Modelica.Units.SI.Time	tau	10	Time constant at nominal flow for dynamic energy and momentum balance

Type	Name	Description
Modelica.Fluid.Interfaces.FluidPort_a	port_aDis	Distribution inlet port
Modelica.Fluid.Interfaces.FluidPort_b	port_bDis	Distribution outlet port
Modelica.Fluid.Interfaces.FluidPort_a	port_aCon	Connection return port
Modelica.Fluid.Interfaces.FluidPort_b	port_bCon	Connection supply port
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	mCon_flow	Connection supply mass flow rate (measured)
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	dH_flow	Difference in enthalpy flow rate between connection supply and return
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	mByp_flow	Bypass mass flow rate
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	TOut	Temperature in distribution line at connection outlet

Type	Name	Description
Fluid.FixedResistances.Junction	junConSup	Junction with connection supply
Fluid.FixedResistances.Junction	junConRet	Junction with connection return
Model_pipDis	pipDis	Distribution pipe
Model_pipCon	pipCon	Connection pipe
Buildings.Fluid.Sensors.MassFlowRate	senMasFloCon	Connection supply mass flow rate (measured)
Buildings.Fluid.Sensors.MassFlowRate	senMasFloByp	Bypass mass flow rate (measured)
DifferenceEnthalpyFlowRate	senDifEntFlo	Difference in enthalpy flow rate
Fluid.Sensors.TemperatureTwoPort	senTOut	Temperature in distribution line at connection outlet

March 3, 2022, by Michael Wetter:
Removed massDynamics.
This is for issue 1542.
February 21, 2020, by Antoine Gautier:
First implementation.