modelDryCoilDiscretizedPControl
Model that demonstrates use of a finite volume model of a heat exchanger without condensation and with feedback control
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
This model demonstrates the use of Buildings.Fluid.HeatExchangers.DryCoilDiscretized. The valve on the water-side is regulated to track a setpoint temperature for the air outlet.
Note that between the controller output and the valve is a model of a motor that has hysteresis. The events generated by the motor model can lead to a significantly higher computing time. In most applications, this level of modeling detail is not justified.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Temperature | T_a1_nominal | 60 + 273.15 | |
| Modelica.Units.SI.Temperature | T_b1_nominal | 50 + 273.15 | |
| Modelica.Units.SI.Temperature | T_a2_nominal | 20 + 273.15 | |
| Modelica.Units.SI.Temperature | T_b2_nominal | 40 + 273.15 | |
| Modelica.Units.SI.MassFlowRate | m1_flow_nominal | 5 | Nominal mass flow rate medium 1 |
| Modelica.Units.SI.MassFlowRate | m2_flow_nominal | m1_flow_nominal*4200/1000*(T_a1_nominal - T_b1_nominal)/(T_b2_nominal - T_a2_nominal) | Nominal mass flow rate medium 2 |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Sources.MassFlowSource_T | sin_2 | ||
| Buildings.Fluid.Sources.Boundary_pT | sou_2 | ||
| Buildings.Fluid.Sources.Boundary_pT | sin_1 | ||
| Buildings.Fluid.Sources.Boundary_pT | sou_1 | ||
| Modelica.Blocks.Sources.Ramp | PSin_1 | ||
| Buildings.Fluid.Sensors.TemperatureTwoPort | temSen | ||
| Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentage | val | Valve model | |
| Modelica.Blocks.Sources.TimeTable | TSet | Setpoint temperature | |
| Buildings.Fluid.HeatExchangers.DryCoilDiscretized | hex | ||
| Buildings.Fluid.Actuators.Motors.IdealMotor | mot | Motor model | |
| Buildings.Controls.Continuous.LimPID | con | Controller |
Contents
| Name | Description |
|---|---|
 Medium1 | Medium model for water |
 Medium2 | Medium model for air |
Revisions
-
December 22, 2014 by Michael Wetter:
RemovedModelica.Fluid.Systemto address issue #311. -
July 3, 2014, by Michael Wetter:
Changed pressure sink to mass flow rate sink to avoid an overdetermined by consistent set of initial conditions. -
March 1, 2013, by Michael Wetter:
Added nominal pressure drop for valve as this parameter no longer has a default value.