modelIndirect
Example model for indirect cooling 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 cooling energy transfer station model. The cooling load ramps up from zero and is modulated according to the QCoo table specification. The mass flow rate of chilled water in the building side is varied based on the building load/demand.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.HeatFlowRate | QCoo_flow_nominal | -19000 | Cooling design flow rate |
| Modelica.Units.SI.TemperatureDifference | dT_nominal | 16 - 7 | 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 | -QCoo_flow_nominal/dT_nominal/cp | Nominal mass flow rate of building cooling supply |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.DHC.ETS.Cooling.Indirect | cooETS | Direct cooling 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 | TSetCHWS | Setpoint temperature for building chilled water supply | |
| Buildings.Fluid.HeatExchangers.HeaterCooler_u | loa | Aggregate building cooling load | |
| Buildings.Fluid.Movers.FlowControlled_m_flow | pumBui | Building-side (secondary) pump | |
| Modelica.Blocks.Sources.CombiTimeTable | QCoo | Cooling 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
-
January 30, 2023:
Corrected parameterization. -
March 20, 2022, by Chengnan Shi:
First implementation.