Main Content

Reservoir (TL)

Thermal liquid reservoir at constant temperature and pressure

expand all in page
  • Reservoir (TL) block

Libraries:
Simscape / Foundation Library / Thermal Liquid / Elements

Description

The Reservoir (TL) block represents an infinite reservoir at fixed pressure and 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.

The inlet temperature depends on the direction of liquid flow. If 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.

Assumptions and Limitations

  • Reservoir pressure and temperature are constant.

Examples

Optimal Pipeline Geometry for Heated Oil Transportation

Optimal Pipeline Geometry for Heated Oil Transportation

Model shows the opposing effects of viscous warming and conductive cooling on the temperature of a buried pipeline segment for heated oil transportation. A requirement for these systems is for the crude oil to stay well above the pour point to provide a continuous steady flow. The system is modeled using the Thermal Liquid Foundation Library. Crude oil thermodynamic properties are stored in workspace matrices and are used to populate the Thermal Liquid Settings block mask parameters.

Water Hammer Effect

Water Hammer Effect

Model shows how the Thermal Liquid foundation library can be used to model water hammer in a long pipe. After slowly establishing a steady flow within the pipe by opening a valve accordingly, the same valve is shut within a few milliseconds. This triggers a water hammer effect. The valve is modeled using a Variable Local Restriction (TL) block and the pipe is divided into four segments using the Pipe (TL) block. Breaking the pipe into more segments increases fidelity at the expense of simulation performance.

Ports

Conserving

expand all

Thermal liquid conserving port associated with the reservoir inlet.

Parameters

expand all

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.

Dependencies

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

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

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

See Also

|

Topics