Temperature Reservoir (TL)

Infinite open reservoir at a fixed temperature


Thermal Liquid/Elements


The Temperature Reservoir (TL) block represents an infinite open reservoir at a fixed temperature. Because it is open, the reservoir and its inlet are at atmospheric pressure. Port A, a thermal liquid conserving port, represents that 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. The reservoir acts as a heat sink. If liquid flows out of the reservoir, the inlet temperature equals that of the reservoir. 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 pipe. This diameter is a function of the specified cross-sectional area of the inlet pipe.

This block also functions as a reference point for pressure and temperature measurements in a pipe network. These measurements are relative to atmospheric pressure and reservoir temperature, respectively.

Assumptions and Limitations

  • Reservoir temperature is constant.

Dialog Box and Parameters

Reservoir temperature

Enter the temperature of the liquid reservoir. During simulation, the block holds this temperature constant. The default value is 293.15 K.

Inlet pipe cross-sectional area

Enter the 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. The default value is 1e-2 m^2.


The block has one thermal liquid conserving port, A.

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