Infinite open reservoir at variable temperature
The Controlled-Temperature Reservoir (TL) block represents an infinite open reservoir at variable temperature. Because it is open, the reservoir and its inlet are at atmospheric pressure. Port A, a thermal liquid conserving port, represents the reservoir inlet. Port Tr, 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. 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.