modelIndirect
Example model for indirect heating energy transfer station
with a closed chilled water loop on the building side
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
This model provides an example for the indirect heating energy transfer station model. The heating load ramps up from zero and is modulated according to the QHea table specification. The mass flow rate of heating water in the building side is varied based on the building load/demand.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.HeatFlowRate | QHea_flow_nominal | 19000 | Heating design flow rate |
| Modelica.Units.SI.TemperatureDifference | dT_nominal | 50 - 40 | Design temperature difference |
| Modelica.Units.SI.SpecificHeatCapacity | cp | Medium.specificHeatCapacityCp(Medium.setState_pTX(Medium.p_default, Medium.T_default, Medium.X_default)) | Default specific heat capacity of medium |
| Nominal condition | |||
| Modelica.Units.SI.MassFlowRate | mBui_flow_nominal | QHea_flow_nominal/dT_nominal/cp | Nominal mass flow rate of building heating supply |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.DHC.ETS.Heating.Indirect | heaETS | Direct heating energy transfer station | |
| Buildings.Fluid.Sources.Boundary_pT | souDis | District (primary) source | |
| Buildings.Fluid.Sources.Boundary_pT | sinDis | District (primary) sink | |
| Modelica.Blocks.Sources.Constant | TSetHWS | Setpoint temperature for building heating water supply | |
| Buildings.Fluid.HeatExchangers.HeaterCooler_u | loa | Aggregate building heating load | |
| Buildings.Fluid.Movers.FlowControlled_m_flow | pumBui | Building-side (secondary) pump | |
| Modelica.Blocks.Sources.CombiTimeTable | QHea | Heating demand | |
| Modelica.Blocks.Math.Product | pro | Multiplier to ramp load from zero | |
| Modelica.Blocks.Sources.Ramp | ram | Ramp load from zero | |
| Modelica.Blocks.Math.Gain | gai | Multiplier gain for calculating m_flow | |
| Buildings.Fluid.Sources.Boundary_pT | souBui | Building (secondary) source |
Contents
| Name | Description |
|---|---|
 Medium | Water medium |
Revisions
-
April 7, 2023, by David Blum:
First implementation.