modelModularExpansionValvesSensors
Model of modular expansion valves, i.g. each valves is in front
of an evaporator, combined with sensors
Extends from BaseClasses.PartialModularExpansionVavles.
Information
This is a model of modular expansion valves that are used, for
example, in close-loop systems like heat pumps or chillers.
It consists of nVal expansion valves in parallel and
also nVal PID conrollers if no external controller is
used. Additionally, four different sensors (i.e. absolute pressure,
temperature, mass flow rate, steam quality) are located at each
expansion valve's outlet.
Modeling approaches
This base model mainly consists of three sub-models. Therefore, please checkout these sub-models for further information of underlying modeling approaches and parameterisation:
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| General › Sensors | |||
| Modelica.Units.SI.Time | tau | 1 | Time constant at nominal flow rate |
| Boolean | transferHeat | false | if true, temperature T converges towards TAmb when no flow |
| Modelica.Units.SI.Temperature | TAmb | Medium.T_default | Fixed ambient temperature for heat transfer |
| Modelica.Units.SI.Time | tauHeaTra | 1200 | Time constant for heat transfer, default 20 minutes |
| Advanced › Initialisation Sensors | |||
| Modelica.Blocks.Types.Init | initTypeSen | Modelica.Blocks.Types.Init.InitialState | Type of initialization (InitialState and InitialOutput are identical) |
| Modelica.Units.SI.Temperature | T_start | Medium.T_default | Initial or guess value of output (= state) |
| Modelica.Units.SI.SpecificEnthalpy | h_out_start | Medium.specificEnthalpy_pTX(p = Medium.p_default, T = Medium.T_default, X = Medium.X_default) | Initial or guess value of output (= state) |
| Advanced › Diagnostics | |||
| Boolean | show_parSen | false | = true, if sensors' input parameters are shown in results |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Utilities.ModularSensors | modularSensors | Model that contains different sensors located behind expansion valves |
Revisions
- October 17, 2017, by Mirko Engelpracht, Christian Vering:
First implementation (see issue 457).