modelPartialDistribution2Pipe2Medium
Extends from Buildings.DHC.Networks.BaseClasses.PartialDistribution2Medium (Partial model for distribution network with two medium declarations).
Information
Partial model of a two-pipe distribution network.
An array of replaceable partial models is used to represent the connections along the network, including the pipe segment immediately upstream each connection.
A replaceable partial model is used to represent the pipe segment of the supply and return line after the last connection.
The parameter iConDpSen is provided to specify the index of the
connection where the pressure drop is measured.
Use zero for a sensor connected to the supply pipe inlet and return pipe outlet.
Use a negative value if no sensor is needed.
Optionally the heat flow rate transferred to each connected load can be output.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | show_heaFlo | false | Set to true to output the heat flow rate transferred to each connected load |
| General | |||
| Integer | nCon (from PartialDistribution2Medium) | Number of connections | |
| Assumptions | |||
| Boolean | allowFlowReversal (from PartialDistribution2Medium) | false | = true to allow flow reversal, false restricts to design direction (port_a -> port_b) |
| General › Nominal condition | |||
| Modelica.Units.SI.MassFlowRate | mDis_flow_nominal | Nominal mass flow rate in the distribution line before the first connection | |
| Modelica.Units.SI.MassFlowRate[nCon] | mCon_flow_nominal | Nominal mass flow rate in each connection line | |
| Modelica.Units.SI.MassFlowRate | mEnd_flow_nominal | mDis_flow_nominal - sum(mCon_flow_nominal) | Nominal mass flow rate in the end of the distribution line |
| Modelica.Units.SI.MassFlowRate[nCon] | mDisCon_flow_nominal | cat(1, {mDis_flow_nominal}, {mDis_flow_nominal - sum(mCon_flow_nominal[1:i]) for i in 1:(nCon - 1)}) | Nominal mass flow rate in the distribution line before each connection |
| Dynamics › Equations | |||
| Modelica.Fluid.Types.Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamics.FixedInitial | Type of energy balance: dynamic (3 initialization options) or steady state |
| Dynamics › Nominal condition | |||
| Modelica.Units.SI.Time | tau | 10 | Time constant at nominal flow for dynamic energy and momentum balance |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Interfaces.FluidPorts_a[nCon] | ports_aCon (from PartialDistribution2Medium) | Connection return ports | |
| Modelica.Fluid.Interfaces.FluidPorts_b[nCon] | ports_bCon (from PartialDistribution2Medium) | Connection supply ports | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_aDisSup (from PartialDistribution2Medium) | Distribution supply inlet port | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_bDisSup (from PartialDistribution2Medium) | Distribution supply outlet port | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_bDisRet | Distribution return outlet port | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_aDisRet | Distribution return inlet port |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.DHC.Networks.BaseClasses.PartialConnection2Pipe2Medium[nCon] | con | ||
| Model_pipDis | pipEnd | Pipe representing the end of the distribution line (after last connection) |
Contents
| Name | Description |
|---|---|
 Model_pipDis |
Revisions
-
March 2, 2022, by Antoine Gautier and Kathryn Hinkelman:
First implementation.