Controlled Mass Flow Rate Source (IL)
A source of mass or volumetric flow.
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Description
The Flow Rate Source (IL) unit represents an ideal source of mechanical energy in an isothermal liquid network. The source maintains a given mass or volume flow rate regardless of the pressure drop across it. There is no hydraulic resistance or heat exchange with the environment.
Ports A and B correspond to the source input and output. The input signal at port M sets the mass flow rate, at port V the volume flow rate. In addition, the mass or volume flow rate can be set by the corresponding block parameters. If the flow rate is positive, fluid flows from port A to port B.
The block icon changes depending on the values of the Controlled source and Flow type parameters.
The block calculates the work done on the liquid and records the signals (results) for information purposes:
,
Where:
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- mechanical work done by the source.
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- is the mass flow rate generated by the source.
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and are the pressure at ports A and B respectively.
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- average density of the mixture of liquids.
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and are the density values of the mixture of fluids at ports A and B, respectively. The equations used to calculate the density of the mixture of liquids depend on the chosen isothermal liquid model.
If the Flow type parameter is set to `Volumetric', the unit calculates the mass flow rate based on the specified volumetric flow rate:
,
Where:
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- outflow density.
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- volumetric flow rate.
Ports
Inlet
M - mass flow control signal, kg/sec
scalar
The signal input port that determines the mass flow rate through the source.
Dependencies
Used when Controlled source is set to on and Flow type is set to `Mass'.
V - volumetric flow control signal, mˆ3/c
scalar
The signal input port that determines the volumetric flow rate through the source.
Dependencies
Used when Controlled source is set to on and Flow type is set to `Volumetric'.
Non-directional
A - source input
isothermal liquid
isothermal liquid port, corresponds to the source inlet. At positive flow velocity 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 flow velocity the liquid flows from port A to port B.
Parameters
Controlled source - possibility to change the flow velocity during simulation
Off (by default) | On
Select whether the flow rate generated by the source can be changed during simulation:
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On- the flow rate generated by the source remains constant during the simulation. The M or V ports are hidden. Selecting this value enables the Mass or Volumetric parameter, depending on the value of the Flow type parameter. -
on- the flow rate is variable and is controlled by the input signal. Selecting this option gives access to the M or V input ports, depending on the value of the Flow type parameter.
Flow type - mass or volumetric flow rate is set
Mass (By default) | Volumetric.
Specifies which flow type is set:
-
Mass- mass flow rate is set. -
Volumetric' - sets the volumetric flow rate.
Mass flow rate - constant mass flow rate through the source
0.0 (By default).
Constant mass flow rate through the source.
Dependencies
Used when Controlled source is set to `Disabled' and Flow type is set to `Mass'.
Volumetric flow rate - constant volumetric flow rate through the source
0.0 (By default).
Constant volumetric flow rate through the source.
Dependencies
Used when Controlled source is set to `Disabled' and Flow type is set to `Volumetric'.