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Controlled Reservoir (TL)

Thermal liquid reservoir at time-varying temperature

  • Controlled Reservoir (TL) block

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The Controlled Reservoir (TL) block represents an infinite reservoir at fixed pressure and variable temperature. The reservoir and its inlet can be at atmospheric pressure or at a specified pressure. Port A, a thermal liquid conserving port, represents the reservoir inlet. Port T, a physical signal port, provides the reservoir temperature control signal.

The inlet temperature depends on the direction of liquid flow. If the liquid flows into the reservoir, the inlet temperature equals that of the upstream liquid and the reservoir acts as a heat sink. If liquid flows out of the reservoir, the inlet temperature equals that of the reservoir and the reservoir acts as a heat source.

To ensure a smooth temperature change at the reservoir inlet during liquid flow reversal, the block includes heat conduction along a length equal to the effective diameter of the inlet pipe. This diameter is a function of the specified cross-sectional area of the inlet pipe.



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Physical signal port that provides the reservoir temperature control signal.


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Thermal liquid conserving port associated with the reservoir inlet.


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Specification method for the reservoir pressure:

  • Atmospheric pressure — Use the atmospheric pressure specified by a Thermal Liquid Settings (TL) or Thermal Liquid Properties (TL) block connected to the circuit.

  • Specified pressure — Specify a value by using the Reservoir pressure parameter.

Desired pressure in the reservoir. This pressure remains constant during simulation.


Enabled when the Reservoir pressure specification parameter is set to Specified pressure.

Cross-sectional area of the reservoir inlet pipe. The block uses this area to determine the characteristic length of the pipe along which heat conduction occurs.

Extended Capabilities

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

Version History

Introduced in R2015a