Controlled Pressure Difference Source (TL)
The source of the pressure drop.
blockType: AcausalFoundation.ThermalLiquid.Sources.PressureDifference
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Controlled Pressure Difference Source (TL) Path in the library: |
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Pressure Difference Source (TL) Path in the library: |
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Description
Block Controlled Pressure Difference Source (TL) It is an ideal source of mechanical energy in a heat-conducting fluid network. The source can maintain a constant or variable pressure drop at the ports regardless of the mass flow through it. There is no hydraulic resistance and no heat exchange with the environment.
Ports A and B correspond to the input and output of the source. If the Controlled source parameter is enabled, the pressure drop is controlled by the input signal on the P port. If the Controlled source parameter is disabled, the pressure drop is set by the Pressure differential parameter. If the differential value is positive, then the pressure at port B is greater than the pressure at port A.
The amount of energy in the source depends on the value of the energy flow through ports A and B and the work performed on the liquid. An equation describing the conservation of energy in a source:
,
where
-
— energy flow through port A;
-
— energy flow through port B;
-
— isentropic work performed on a liquid.
The isentropic work performed on a thermally conductive liquid can be defined as
,
where
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— mass flow of liquid from port A to port B;
-
— port pressure A;
-
— port pressure B;
-
— the average density of the liquid, determined by the formula:
.
Ports
Entrance
P — differential pressure setting signal, Pa
scalar
The input scalar signal specifying the pressure drop of the heat-conducting liquid in the source.
Dependencies
Used if the Controlled source parameter is enabled.
Non-directional
A — input of the pass source:q[<br>] heat-conducting liquid
The port of the heat-conducting liquid corresponds to the inlet of the source. A positive pressure drop causes the pressure at port B to be greater than the pressure at port A.
B — pass source output:q[<br>] heat-conducting liquid
The port of the heat-conducting liquid corresponds to the outlet of the source. A positive pressure drop causes the pressure at port B to be greater than the pressure at port A.
Parameters
Controlled source — is the pressure drop set by the input signal
Enabled (by default) | Turned off
Determines how the pressure drop will be set:
-
Enabled— the pressure drop is set by the input signal P. -
Turned off— the constant pressure drop is set by the Pressure differential parameter.
Pressure differential — constant pressure drop
0.0 (default) | scalar
Constant pressure drop at the source ports.
Dependencies
Used if the Controlled source parameter is set to Turned off.
Isentropic power added — does the source perform isentropic work
Enabled (by default) | Turned off
Sets whether the source performs isentropic work with the flow of a thermally conductive liquid.:
-
Enabled— the source performs isentropic work with the flow of a thermally conductive liquid to maintain a given pressure drop. Use this parameter to represent the ideal pump or compressor and to properly account for energy consumption and output, especially in closed-loop systems. -
Turned off— the source does not perform any work with the flow, neither adding nor removing power, regardless of the pressure drop created by the source. Use this option to adjust the desired flow state in front of the system without affecting the flow temperature.
Cross-sectional area at ports A and B — the cross-sectional area normal to the flow path at ports A and B
0.01 m2 (default)
The cross-sectional area is normal to the flow path at ports A and B.