Controlled Pressure Difference Source (IL)
Source of pressure.
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Description
The Pressure Difference Source (IL) unit is an ideal source of mechanical energy in an isothermal liquid network. The source maintains a predetermined pressure differential at its ports regardless of the mass flow rate through it. There is no hydraulic resistance and no heat exchange with the environment.
Ports A and B correspond to the source inlet and outlet. The input scalar signal at port P sets the pressure difference. The constant differential pressure is set by the parameter Pressure Different. If the differential is positive, the pressure at port B is greater than the pressure at port A.
The block icon changes depending on the value of the Controlled source parameter.
The block calculates the work done on the fluid and includes the results in the Data Inspector as additional information:
Where:
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- is the mechanical work done by the source.
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- is the mass flow rate generated by the source.
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and - pressure at ports A and B respectively.
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- is the average density of the liquid-air mixture.
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and - values of density of the mixture of liquids at ports A and B respectively. The equations used to calculate the density of the liquid-air mixture depend on the chosen isothermal liquid model.
Ports
Inlet
P - differential pressure setpoint signal, Pa
scalar
Input port that sets the differential pressure at the source.
Dependencies
This port is only used when Controlled source is set to on.
Non-directional
A - source input
isothermal liquid
isothermal liquid port, corresponds to the source inlet. At positive differential, the liquid flows from port A to port B.
B is the source outlet
isothermal liquid
Isothermal liquid port, corresponds to the source outlet. At positive differential, the liquid flows from port A to port B.
Parameters
Controlled source - possibility to change differential pressure during modelling
Off (by default) | On
Select whether the differential pressure can be changed during the simulation:
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Off- the differential pressure remains constant during the simulation. The P port is hidden. -
on- the input scalar signal on the P port defines a differential pressure that can change during the simulation.
Pressure differential - differential pressure value
`0.0 (By default)
Pressure differential. This value remains constant during the simulation.
Dependencies
It is used when Controlled source is set to Off.