modelWetCoilCounterFlowPIControlAutoTuning

Model that demonstrates the use of a heat exchanger with condensation and with autotuning PI feedback control
Diagram of WetCoilCounterFlowPIControlAutoTuningOpen the diagram
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Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.HeatExchangers.Examples.BaseClasses.PartialWetCoilCounterFlow (Partial model that demonstrates use of a heat exchanger with condensation and with feedback control).

Information

This example is identical to Buildings.Fluid.HeatExchangers.Examples.WetCoilCounterFlowPControl except that the PI controller is replaced with an autotuning PI controller.

The autotuning is triggered at 2100 seconds and the autotuning is successfully completed at around 2169 seconds.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.TemperatureT_a1_nominal (from PartialWetCoilCounterFlow)5 + 273.15
Modelica.Units.SI.TemperatureT_b1_nominal (from PartialWetCoilCounterFlow)10 + 273.15
Modelica.Units.SI.TemperatureT_a2_nominal (from PartialWetCoilCounterFlow)30 + 273.15
Modelica.Units.SI.TemperatureT_b2_nominal (from PartialWetCoilCounterFlow)15 + 273.15
Modelica.Units.SI.MassFlowRatem1_flow_nominal (from PartialWetCoilCounterFlow)0.1Nominal mass flow rate medium 1
Modelica.Units.SI.MassFlowRatem2_flow_nominal (from PartialWetCoilCounterFlow)0.2*m1_flow_nominal*4200/1000*(T_a1_nominal - T_b1_nominal)/(T_b2_nominal - T_a2_nominal)Nominal mass flow rate medium 2

Components

TypeNameDefaultDescription
Buildings.Fluid.Sources.Boundary_pTsin_2 (from PartialWetCoilCounterFlow)
Buildings.Fluid.Sources.Boundary_pTsou_2 (from PartialWetCoilCounterFlow)
Buildings.Fluid.Sources.Boundary_pTsin_1 (from PartialWetCoilCounterFlow)
Buildings.Fluid.Sources.Boundary_pTsou_1 (from PartialWetCoilCounterFlow)
Buildings.Fluid.FixedResistances.PressureDropres_2 (from PartialWetCoilCounterFlow)
Buildings.Fluid.FixedResistances.PressureDropres_1 (from PartialWetCoilCounterFlow)
Buildings.Fluid.Sensors.TemperatureTwoPorttemSen (from PartialWetCoilCounterFlow)
Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentageval (from PartialWetCoilCounterFlow)Control valve
Modelica.Blocks.Sources.TimeTableTSet (from PartialWetCoilCounterFlow)Setpoint temperature
Buildings.Fluid.HeatExchangers.WetCoilCounterFlowhex (from PartialWetCoilCounterFlow)
Modelica.Blocks.Sources.Constantconst (from PartialWetCoilCounterFlow)
Buildings.Utilities.Psychrometrics.X_pTphix_pTphi (from PartialWetCoilCounterFlow)
Modelica.Blocks.Sources.Constantconst1 (from PartialWetCoilCounterFlow)
Modelica.Blocks.Sources.RampTWat (from PartialWetCoilCounterFlow)Water temperature, raised to high value at t=3000 s
Buildings.Controls.OBC.Utilities.PIDWithAutotuning.FirstOrderAMIGOconController
Buildings.Controls.OBC.CDL.Logical.Sources.ConstantresSigReset signal
Buildings.Controls.OBC.CDL.Logical.Sources.PulseautTunSigSignal for enabling the autotuning

Revisions

  • March 8, 2024, by Michael Wetter:
    Removed wrong normalization.
  • November 28, 2023, by Sen Huang:
    Replaced the PI controller with an autotuning PI controller.