.TRANSFORM.Fluid.Sensors

Information

Package Sensors consists of idealized sensor components that provide variables of a medium model and/or fluid ports as output signals. These signals can be, e.g., further processed with components of the Modelica.Blocks library. Also more realistic sensor models can be built, by further processing (e.g., by attaching block Modelica.Blocks.FirstOrder to model the time constant of the sensor).

For the thermodynamic state variables temperature, specific enthalpy, specific entropy and density the fluid library provides two different types of sensors: regular one port and two port sensors.

• The regular one port sensors have the advantage of easy introduction and removal from a model, as no connections have to be broken. A potential drawback is that the obtained value jumps as flow reverts.
• The two port sensors offer the advantages of an adjustable regularized step function around zero flow. Moreover the obtained result is restricted to the value flowing into port_a if allowFlowReversal is false.

Modelica.Fluid.Examples.Explanatory.MeasuringTemperature demonstrates the differences between one- and two-port sensor at hand of a simple example.

Contents

Name	Description
Examples
Pressure	Ideal pressure sensor
Density	Ideal one port density sensor
DensityTwoPort	Ideal two port density sensor
Temperature	Ideal one port temperature sensor
TemperatureTwoPort	Ideal two port temperature sensor
SpecificEnthalpy	Ideal one port specific enthalpy sensor
SpecificEnthalpyTwoPort	Ideal two port sensor for the specific enthalpy
SpecificEntropy	Ideal one port specific entropy sensor
SpecificEntropyTwoPort	Ideal two port sensor for the specific entropy
MassFractions	Ideal one port mass fraction sensor
MassFractionsTwoPort	Ideal two port sensor for mass fraction
MassFractionsTwoPort_multi	Ideal two port sensor for species
TraceSubstances	Ideal one port trace substances sensor
TraceSubstancesTwoPort	Ideal two port sensor for trace substance
TraceSubstancesTwoPort_multi	Ideal two port sensor for trace substance
MassFlowRate	Ideal sensor for mass flow rate
VolumeFlowRate	Ideal sensor for volume flow rate
RelativePressure	Ideal relative pressure sensor
RelativeTemperature	Ideal relative temperature sensor
PressureTemperature	Ideal pressure and temperature sensor
PressureTemperatureTwoPort	Ideal two port pressure and temperature sensor
BaseClasses	Base classes used in the Sensors package (only of interest to build new component models)

Revisions

• 22 Dec 2008 by R;uumldiger Franke
  
  • flow sensors based on Interfaces.PartialTwoPort
  • adapted docu to stream connectors, i.e., less need for two port sensors
• 4 Dec 2008 by Michael Wetter
  included sensors for trace substance
• 31 Oct 2007 by Carsten Heinrich
  updated sensor models, included one and two port sensors for thermodynamic state variables