Engee documentation

Controlled Reservoir (TL)

The source (drain) for the heat-conducting liquid network.

blockType: AcausalFoundation.ThermalLiquid.Elements.Reservoir

controlled reservoir (tl)

Controlled Reservoir (TL)

Path in the library:

/Physical Modeling/Fundamental/Thermal Liquid/Elements/Controlled Reservoir (TL)

reservoir (tl)

Reservoir (TL)

Path in the library:

/Physical Modeling/Fundamental/Thermal Liquid/Elements/Reservoir (TL)

Description

Block Controlled Reservoir (TL) It is a vessel of unlimited volume with constant temperature and pressure. The tank can be open (atmospheric) or have a preset constant pressure. Port A corresponds to the entrance to the tank. The P port receives the signal of the set pressure in the tank. The T port receives the signal of the set temperature in the tank.

If the Controlled option is checked, the pressure and temperature in the tank are controlled by the input scalar signals on the P and T ports. If the Controlled option is not checked, the pressure and temperature are constant and are set using the Reservoir pressure and Reservoir temperature parameters, respectively.

The inlet temperature depends on the direction of the liquid flow. If liquid flows into the tank, the inlet temperature is equal to the temperature of the liquid upstream, and the tank acts as a heat sink (heat sink element). If liquid flows out of the tank, the inlet temperature is equal to the temperature in the tank, and the tank acts as a heat source.

To ensure a smooth change in temperature at the inlet to the tank when changing the flow direction in the block, thermal conductivity is modeled at a length equal to the effective diameter of the inlet section. This diameter depends on the specified cross-sectional area of the port A.

Assumptions and limitations

  • The pressure and temperature inside the tank are constant.

Ports

Non-directional

A — heat-conducting liquid port
heat-conducting liquid

The port of the heat-conducting liquid corresponds to the entrance to the tank.

Entrance

P — pressure, Pa
scalar

The inlet port that determines the pressure value in the tank.

Dependencies

To use this port, select the Controlled checkbox.

T — temperature, K
scalar

The input port that determines the temperature value in the tank.

Dependencies

To use this port, select the Controlled checkbox.

Parameters

Controlled — a way to specify pressure and temperature
Disabled (by default) | Enabled

Determines how the pressure and temperature values will be obtained:

  • Enabled — pressure and temperature in the tank are controlled by input scalar signals on ports P and T.

  • Turned off — pressure and temperature are constant and are set using the Reservoir pressure parameters (if the Reservoir pressure specification parameter is set to Specified pressure, otherwise the pressure is equal to atmospheric pressure) and Reservoir temperature.

Reservoir pressure specification — pressure setting method
Atmospheric pressure (by default) | Specified pressure

Select the pressure setting method:

  • Atmospheric pressure — the pressure in the tank is equal to normal atmospheric pressure.

  • Specified pressure — the pressure is set via the Reservoir pressure parameter.

Reservoir pressure — tank pressure
0.101325 MPa (default)

The pressure in the tank is set. This pressure remains constant throughout the simulation time.

Dependencies

Used if the Controlled checkbox is unchecked and the Reservoir pressure specification parameter is set to Specified pressure.

Reservoir temperature — temperature in the pass tank:q[<br>] 293.15 K (default)

The temperature in the tank is set. This temperature remains constant throughout the simulation time.

Dependencies

Used if the Controlled checkbox is unchecked.

Cross-sectional area at port A — inlet cross-sectional area of the pass tank:q[<br>] 0.01 m2 (default)

The cross-sectional area of the channel at the entrance to the tank.

Examples