Modelica.Thermal.FluidHeatFlow.Sensors

Ideal sensors to measure port properties

Information

This package contains sensors:

pSensor: absolute pressure
TSensor: absolute temperature (Kelvin)
dpSensor: pressure drop between flowPort_a and flowPort_b
dTSensor: temperature difference between flowPort_a and flowPort_b
m_flowSensor: measures mass flow rate
V_flowSensor: measures volume flow rate
H_flowSensor: measures enthalpy flow rate

Some of the sensors do not need access to medium properties for measuring, but it is necessary to define the medium in the connector (check of connections).
Thermodynamic equations are defined in partial models (package Interfaces.Partials).
All sensors are considered massless, they do not change mass flow or enthalpy flow.

Main Authors:

Anton Haumer
Technical Consulting & Electrical Engineering
A-3423 St.Andrae-Woerdern, Austria
email: a.haumer@haumer.at

Dr.Christian Kral
Österreichisches Forschungs- und Prüfzentrum Arsenal Ges.m.b.H.
arsenal research
Giefinggasse 2
A-1210 Vienna, Austria

The Modelica package is free software; it can be redistributed and/or modified under the terms of the Modelica license, see the license conditions and the accompanying disclaimer here.

Extends from Modelica.Icons.Library2 (Icon for library where additional icon elements shall be added).

Package Content

Name Description

PressureSensor Absolute pressure sensor

TemperatureSensor Absolute temperature sensor

RelPressureSensor Pressure difference sensor

RelTemperatureSensor Temperature difference sensor

MassFlowSensor Mass flow sensor

VolumeFlowSensor Volume flow sensor

EnthalpyFlowSensor Enthapy flow sensor

Name	Description
PressureSensor	Absolute pressure sensor
TemperatureSensor	Absolute temperature sensor
RelPressureSensor	Pressure difference sensor
RelTemperatureSensor	Temperature difference sensor
MassFlowSensor	Mass flow sensor
VolumeFlowSensor	Volume flow sensor
EnthalpyFlowSensor	Enthapy flow sensor

Modelica.Thermal.FluidHeatFlow.Sensors.PressureSensor

Absolute pressure sensor

Modelica.Thermal.FluidHeatFlow.Sensors.PressureSensor

Information

pSensor measures the absolute pressure.
Thermodynamic equations are defined by Partials.AbsoluteSensor.

Extends from Interfaces.Partials.AbsoluteSensor (Partial model of absolute sensor).

Parameters

Type Name Default Description

Medium medium FluidHeatFlow.Media.Medium() Sensor's medium

Type	Name	Default	Description
Medium	medium	FluidHeatFlow.Media.Medium()	Sensor's medium

Connectors

Type Name Description

FlowPort_a flowPort

output RealOutput y

Type	Name	Description
FlowPort_a	flowPort
output RealOutput	y

Modelica definition

model PressureSensor "Absolute pressure sensor"

  extends Interfaces.Partials.AbsoluteSensor;
equation 
  y = flowPort.p;
end PressureSensor;

Modelica.Thermal.FluidHeatFlow.Sensors.TemperatureSensor

Absolute temperature sensor

Modelica.Thermal.FluidHeatFlow.Sensors.TemperatureSensor

Information

TSensor measures the absolute temperature (Kelvin).
Thermodynamic equations are defined by Partials.AbsoluteSensor.

Extends from Interfaces.Partials.AbsoluteSensor (Partial model of absolute sensor).

Parameters

Type Name Default Description

Medium medium FluidHeatFlow.Media.Medium() Sensor's medium

Type	Name	Default	Description
Medium	medium	FluidHeatFlow.Media.Medium()	Sensor's medium

Connectors

Type Name Description

FlowPort_a flowPort

output RealOutput y

Type	Name	Description
FlowPort_a	flowPort
output RealOutput	y

Modelica definition

model TemperatureSensor "Absolute temperature sensor"

  extends Interfaces.Partials.AbsoluteSensor;
equation 
  medium.cp*y = flowPort.h;
end TemperatureSensor;

Modelica.Thermal.FluidHeatFlow.Sensors.RelPressureSensor

Pressure difference sensor

Modelica.Thermal.FluidHeatFlow.Sensors.RelPressureSensor

Information

dpSensor measures the pressure drop between flowPort_a and flowPort_b.
Thermodynamic equations are defined by Partials.RelativeSensor.

Extends from Interfaces.Partials.RelativeSensor (Partial model of relative sensor).

Parameters

Type Name Default Description

Medium medium FluidHeatFlow.Media.Medium() Sensor's medium

Type	Name	Default	Description
Medium	medium	FluidHeatFlow.Media.Medium()	Sensor's medium

Connectors

Type Name Description

FlowPort_a flowPort_a

FlowPort_b flowPort_b

output RealOutput y

Type	Name	Description
FlowPort_a	flowPort_a
FlowPort_b	flowPort_b
output RealOutput	y

Modelica definition

model RelPressureSensor "Pressure difference sensor"

  extends Interfaces.Partials.RelativeSensor;
equation 
  y = flowPort_a.p - flowPort_b.p;
end RelPressureSensor;

Modelica.Thermal.FluidHeatFlow.Sensors.RelTemperatureSensor

Temperature difference sensor

Modelica.Thermal.FluidHeatFlow.Sensors.RelTemperatureSensor

Information

dTSensor measures the temperature difference between flowPort_a and flowPort_b.
Thermodynamic equations are defined by Partials.RelativeSensor.
Note: Connected flowPorts have the same temperature (mixing temperature)!
Since mixing my occur, the outlet temperature of a component may be different from the connector's temperature.
Outlet temperature is defined by variable T of the corresponding component.

Extends from Interfaces.Partials.RelativeSensor (Partial model of relative sensor).

Parameters

Type Name Default Description

Medium medium FluidHeatFlow.Media.Medium() Sensor's medium

Type	Name	Default	Description
Medium	medium	FluidHeatFlow.Media.Medium()	Sensor's medium

Connectors

Type Name Description

FlowPort_a flowPort_a

FlowPort_b flowPort_b

output RealOutput y

Type	Name	Description
FlowPort_a	flowPort_a
FlowPort_b	flowPort_b
output RealOutput	y

Modelica definition

model RelTemperatureSensor "Temperature difference sensor"

  extends Interfaces.Partials.RelativeSensor;
equation 
  medium.cp*y = flowPort_a.h - flowPort_b.h;
end RelTemperatureSensor;

Modelica.Thermal.FluidHeatFlow.Sensors.MassFlowSensor

Mass flow sensor

Modelica.Thermal.FluidHeatFlow.Sensors.MassFlowSensor

Information

m_flowSensor measures the mass flow rate.
Thermodynamic equations are defined by Partials.FlowSensor.

Extends from Interfaces.Partials.FlowSensor (Partial model of flow sensor).

Parameters

Type Name Default Description

Medium medium FluidHeatFlow.Media.Medium() Medium in the component

Type	Name	Default	Description
Medium	medium	FluidHeatFlow.Media.Medium()	Medium in the component

Connectors

Type Name Description

FlowPort_a flowPort_a

FlowPort_b flowPort_b

output RealOutput y

Type	Name	Description
FlowPort_a	flowPort_a
FlowPort_b	flowPort_b
output RealOutput	y

Modelica definition

model MassFlowSensor "Mass flow sensor"

  extends Interfaces.Partials.FlowSensor;
equation 
  y = V_flow*medium.rho;
end MassFlowSensor;

Modelica.Thermal.FluidHeatFlow.Sensors.VolumeFlowSensor

Volume flow sensor

Modelica.Thermal.FluidHeatFlow.Sensors.VolumeFlowSensor

Information

V_flowSensor measures the volume flow rate.
Thermodynamic equations are defined by Partials.FlowSensor.

Extends from Interfaces.Partials.FlowSensor (Partial model of flow sensor).

Parameters

Type Name Default Description

Medium medium FluidHeatFlow.Media.Medium() Medium in the component

Type	Name	Default	Description
Medium	medium	FluidHeatFlow.Media.Medium()	Medium in the component

Connectors

Type Name Description

FlowPort_a flowPort_a

FlowPort_b flowPort_b

output RealOutput y

Type	Name	Description
FlowPort_a	flowPort_a
FlowPort_b	flowPort_b
output RealOutput	y

Modelica definition

model VolumeFlowSensor "Volume flow sensor"

  extends Interfaces.Partials.FlowSensor;
equation 
  y = V_flow;
end VolumeFlowSensor;

Modelica.Thermal.FluidHeatFlow.Sensors.EnthalpyFlowSensor

Enthapy flow sensor

Modelica.Thermal.FluidHeatFlow.Sensors.EnthalpyFlowSensor

Information

H_flowSensor measures the enthalpy flow rate.
Thermodynamic equations are defined by Partials.FlowSensor.

Extends from Interfaces.Partials.FlowSensor (Partial model of flow sensor).

Parameters

Type Name Default Description

Medium medium FluidHeatFlow.Media.Medium() Medium in the component

Type	Name	Default	Description
Medium	medium	FluidHeatFlow.Media.Medium()	Medium in the component

Connectors

Type Name Description

FlowPort_a flowPort_a

FlowPort_b flowPort_b

output RealOutput y

Type	Name	Description
FlowPort_a	flowPort_a
FlowPort_b	flowPort_b
output RealOutput	y

Modelica definition

model EnthalpyFlowSensor "Enthapy flow sensor"

  extends Interfaces.Partials.FlowSensor;
equation 
  y = flowPort_a.H_flow;
end EnthalpyFlowSensor;

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