Thermodynamic Properties Sensor (G)

Measure specific enthalpy, density, specific heat at constant pressure, and specific entropy

Libraries:
Simscape / Foundation Library / Gas / Sensors

Description

The Thermodynamic Properties Sensor (G) block represents an ideal sensor that measures specific enthalpy, density, specific heat at constant pressure, and specific entropy in a gas network. There is no mass or energy flow through the sensor.

The block measures these thermodynamic properties at the node connected to port A. The first three measurements (specific enthalpy, density, specific heat at constant pressure) are taken with respect to absolute zero. There is no universal definition of what constitutes zero entropy, therefore you can use the block parameters to provide the reference entropy value for sensor calibration.

Ports

Output

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h — Specific enthalpy measurement, kJ/kg
physical signal

Physical signal output port for measuring the gas specific enthalpy.

Dependencies

To enable this port, select the Enthalpy check box.

ρ — Density measurement, kg/m^3
physical signal

Physical signal output port for measuring the gas density.

Dependencies

To enable this port, select the Density check box.

cp — Specific heat at constant pressure measurement, kJ/(kg*K)
physical signal

Physical signal output port for measuring the gas specific heat at constant pressure.

Dependencies

To enable this port, select the Specific heat check box.

s — Specific entropy measurement, kJ/(kg*K)
physical signal

Physical signal output port for measuring the gas specific entropy.

Dependencies

To enable this port, select the Entropy check box.

Conserving

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A — Sensor inlet
gas

Gas conserving port. Connect this port to the node in the gas network where you want to measure the thermodynamic properties. All measurements are taken with respect to absolute zero.

Parameters

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Enthalpy — Control output port visibility for measuring specific enthalpy
`Off` (default) | `On`

Selecting this check box exposes the output port h, which lets you measure the gas specific enthalpy.

Density — Control output port visibility for measuring density
`On` (default) | `Off`

Selecting this check box exposes the output port ρ, which lets you measure the gas density.

Specific heat — Control output port visibility for measuring specific heat
`Off` (default) | `On`

Selecting this check box exposes the output port cp, which lets you measure the gas specific heat.

Entropy — Control output port visibility for measuring specific entropy
`Off` (default) | `On`

Selecting this check box exposes the output port s, which lets you measure the gas specific entropy.

Specific entropy at reference pressure and temperature — Reference specific entropy used for sensor calibration
3.8635 kJ/kg/K (default)

The sensor is calibrated so that it outputs this specific entropy value when port A is at reference pressure and temperature.

Dependencies

To enable this parameter, select the Entropy check box.

Reference pressure for specific entropy — Reference pressure used for sensor calibration
0.101325 MPa (default)

The sensor is calibrated so that it outputs the value specified by the Specific entropy at reference pressure and temperature parameter when port A is at reference pressure and temperature.

Dependencies

To enable this parameter, select the Entropy check box.

Reference temperature for specific entropy — Reference temperature used for sensor calibration
293.15 K (default)

The sensor is calibrated so that it outputs the value specified by the Specific entropy at reference pressure and temperature parameter when port A is at reference pressure and temperature.

Dependencies

To enable this parameter, select the Entropy check box.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2017a

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R2023a: Usability enhancement for gas sensors

Gas sensor blocks with multiple output ports now have conditional port visibility on the block icon. You can use the block parameters to expose only the ports that you need for measurements in a particular model.

There is no compatibility impact when you use the Thermodynamic Properties Sensor (G) block in your models. However, if you use this block in your custom composite components, you need to update the composite component code.

Old Syntax	New Syntax
`sensor = foundation.gas.sensors.thermodynamic_sensor;`	`sensor = foundation.gas.sensors.thermodynamic_sensor(enthalpy=true, specific_heat=true, entropy=true);`

Thermodynamic Properties Sensor (G)

Description

Ports

Output

h — Specific enthalpy measurement, kJ/kg
physical signal

Dependencies

ρ — Density measurement, kg/m^3
physical signal

Dependencies

cp — Specific heat at constant pressure measurement, kJ/(kg*K)
physical signal

Dependencies

s — Specific entropy measurement, kJ/(kg*K)
physical signal

Dependencies

Conserving

A — Sensor inlet
gas

Parameters

Enthalpy — Control output port visibility for measuring specific enthalpy
`Off` (default) | `On`

Density — Control output port visibility for measuring density
`On` (default) | `Off`

Specific heat — Control output port visibility for measuring specific heat
`Off` (default) | `On`

Entropy — Control output port visibility for measuring specific entropy
`Off` (default) | `On`

Specific entropy at reference pressure and temperature — Reference specific entropy used for sensor calibration
3.8635 kJ/kg/K (default)

Dependencies

Reference pressure for specific entropy — Reference pressure used for sensor calibration
0.101325 MPa (default)

Dependencies

Reference temperature for specific entropy — Reference temperature used for sensor calibration
293.15 K (default)

Dependencies

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

R2023a: Usability enhancement for gas sensors

See Also

Topics

Thermodynamic Properties Sensor (G)

Description

Ports

Output

h — Specific enthalpy measurement, kJ/kg physical signal

Dependencies

ρ — Density measurement, kg/m^3 physical signal

Dependencies

cp — Specific heat at constant pressure measurement, kJ/(kg*K) physical signal

Dependencies

s — Specific entropy measurement, kJ/(kg*K) physical signal

Dependencies

Conserving

A — Sensor inlet gas

Parameters

Enthalpy — Control output port visibility for measuring specific enthalpy Off (default) | On

Density — Control output port visibility for measuring density On (default) | Off

Specific heat — Control output port visibility for measuring specific heat Off (default) | On

Entropy — Control output port visibility for measuring specific entropy Off (default) | On

Specific entropy at reference pressure and temperature — Reference specific entropy used for sensor calibration 3.8635 kJ/kg/K (default)

Dependencies

Reference pressure for specific entropy — Reference pressure used for sensor calibration 0.101325 MPa (default)

Dependencies

Reference temperature for specific entropy — Reference temperature used for sensor calibration 293.15 K (default)

Dependencies

Extended Capabilities

C/C++ Code Generation Generate C and C++ code using Simulink® Coder™.

Version History

R2023a: Usability enhancement for gas sensors

See Also

Topics

h — Specific enthalpy measurement, kJ/kg
physical signal

ρ — Density measurement, kg/m^3
physical signal

cp — Specific heat at constant pressure measurement, kJ/(kg*K)
physical signal

s — Specific entropy measurement, kJ/(kg*K)
physical signal

A — Sensor inlet
gas

Enthalpy — Control output port visibility for measuring specific enthalpy
`Off` (default) | `On`

Density — Control output port visibility for measuring density
`On` (default) | `Off`

Specific heat — Control output port visibility for measuring specific heat
`Off` (default) | `On`

Entropy — Control output port visibility for measuring specific entropy
`Off` (default) | `On`

Specific entropy at reference pressure and temperature — Reference specific entropy used for sensor calibration
3.8635 kJ/kg/K (default)

Reference pressure for specific entropy — Reference pressure used for sensor calibration
0.101325 MPa (default)

Reference temperature for specific entropy — Reference temperature used for sensor calibration
293.15 K (default)

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.