modelDistribution2PipePlugFlow_v
Model of a two-pipe distribution network using plug flow pipe models in the main lines with hydraulic diameter calculated from nominal velocity
Extends from Buildings.DHC.Networks.BaseClasses.PartialDistribution2Pipe.
Information
This is a model of a two-pipe distribution network using a connection model with a plug flow pipe model (pressure drop, heat transfer, transport delays) in the main lines whose hydraulic diameters are calculated based on nominal velocity at nominal flow rate Buildings.DHC.Networks.Connections.Connection2PipePlugFlow. The same pipe model is also used at the end of the distribution line (after the last connection) only on the supply side.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Length[nCon] | lDis | Length of the distribution pipe before each connection (supply only, not counting return line) | |
| Modelica.Units.SI.Length | lEnd | Length of the end of the distribution line (supply only, not counting return line) | |
| Modelica.Units.SI.Length | dIns | 0.05 | Thickness of pipe insulation, used to compute R |
| Modelica.Units.SI.ThermalConductivity | kIns | 0.028 | Heat conductivity of pipe insulation, used to compute R |
| Modelica.Units.SI.Velocity | v_nominal | 1.5 | Velocity at m_flow_nominal (used to compute default value for hydraulic diameter dh) |
| Modelica.Units.SI.Height | roughness | 2.5e-5 | Average height of surface asperities (default: smooth steel pipe) |
| Modelica.Units.SI.SpecificHeatCapacity | cPip | 2300 | Specific heat of pipe wall material. 2300 for PE, 500 for steel |
| Modelica.Units.SI.Density | rhoPip | 930 | Density of pipe wall material. 930 for PE, 8000 for steel |
| Modelica.Units.SI.Length | thickness | 0.0035 | Pipe wall thickness |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Interfaces.HeatPorts_a[nCon + 1] | heatPortsDis | Multiple heat ports that connect to outside of pipe wall for distribution pipe | |
| Modelica.Fluid.Interfaces.HeatPorts_a[nCon] | heatPortsRet | Multiple heat ports that connect to outside of pipe wall for return pipe |
Revisions
-
March 15, 2024, by David Blum:
Renamed. This is for issue 3712. -
January 27, 2023, by Michael Wetter:
Removed connection to itself. -
January 2, 2023, by Kathryn Hinkelman:
First implementation.