WOLFRAM SYSTEMMODELER

OpenTank

Model of a tank under ambient pressure

Wolfram Language

In[1]:=
SystemModel["Modelica.Thermal.FluidHeatFlow.Components.OpenTank"]
Out[1]:=

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This is a simple model of an open tank with volume A*h. The level and the temperature of the medium are measured and provided as output.

Note: If the level of the medium reaches 0 (minimum) or h (maximum), an assertion is triggered.

Note: The flowPort is assumed to be at the bottom. Therefore the pressure at the flowPort is ambient pressure + level*rho*g.

  • If the mass flow rate at the port goes into the tank the level increases and the mixing rule is applied to obtain the temperature change of the medium in the tank.
  • If the mass flow rate at the port goes out of the tank the level decreases, the temperature of the outflowing medium is defined by the the temperature of the medium in the tank.

It is assumed that the medium in the tank has the same temperature over the whole volume, i.e. mixed thoroughly.

Via the optional heatPort the medium in the tank can be cooled or heated.

Parameters (8)

medium

Value: Modelica.Thermal.FluidHeatFlow.Media.Medium()

Type: Medium

Description: Medium

T0

Value:

Type: Temperature (K)

Description: Initial temperature of medium

T0fixed

Value: false

Type: Boolean

Description: Initial temperature guess value or fixed

ATank

Value:

Type: Area (m²)

Description: Cross section of tank

hTank

Value:

Type: Length (m)

Description: Height of tank

pAmbient

Value:

Type: Pressure (Pa)

Description: Ambient pressure

g

Value: Modelica.Constants.g_n

Type: Acceleration (m/s²)

Description: Gravitation

useHeatPort

Value: false

Type: Boolean

Description: =true, if HeatPort is enabled

Outputs (2)

T_port

Type: Temperature (K)

Description: Temperature at flowPort_a

T

Type: Temperature (K)

Description: Outlet temperature of medium

Connectors (4)

flowPort

Type: FlowPort_a

heatPort

Type: HeatPort_a

Description: Optional port for cooling or heating the medium in the tank

level

Type: RealOutput

Description: Level of medium in tank

TTank

Type: RealOutput

Description: Temperature of medium in tank

Components (1)

medium

Type: Medium

Description: Medium

Used in Examples (2)

TestOpenTank

Modelica.Thermal.FluidHeatFlow.Examples

Test the OpenTank model

TwoTanks

Modelica.Thermal.FluidHeatFlow.Examples

Two connected open tanks