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WOLFRAM SYSTEM MODELER

TankWithTopPorts

Tank with inlet/outlet ports and with inlet ports at the top

Diagram

Wolfram Language

In[1]:=

SystemModel["Modelica.Fluid.Examples.AST_BatchPlant.BaseClasses.TankWithTopPorts"]

Out[1]:=

Information

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

Model of a tank that is open to the environment at the fixed pressure p_ambient. The tank is filled with a single or multiple-substance liquid, assumed to have uniform temperature and mass fractions.

At the top of the tank over the maximal fill level height a vector of FluidPorts, called topPorts, is present. The assumption is made that fluid flows always in to the tank via these ports (and never back in to the connector).

The vector of connectors ports are fluid ports at the bottom and side of the tank at a definable height. Fluid can flow either out of or in to this port. The fluid level of the tank may be below one of these ports. This case is approximated by introducing a large pressure flow coefficient so that the mass flow rate through this port is very small in this case.

If the tank starts to over flow (i.e., level > height), an assertion is triggered.

When the diagram layer is open in the plot environment, the level of the tank is dynamically visualized. Note, the speed of the diagram animation in Dymola can be set via command animationSpeed(), e.g., animationSpeed(speed = 10)

Parameters (24)

energyDynamics	Value: system.energyDynamics Type: Dynamics Description: Formulation of energy balance
massDynamics	Value: system.massDynamics Type: Dynamics Description: Formulation of mass balance
substanceDynamics	Value: massDynamics Type: Dynamics Description: Formulation of substance balance
traceDynamics	Value: massDynamics Type: Dynamics Description: Formulation of trace substance balance
p_start	Value: p_ambient Type: AbsolutePressure (Pa) Description: Start value of pressure
use_T_start	Value: true Type: Boolean Description: = true, use T_start, otherwise h_start
T_start	Value: if use_T_start then system.T_start else Medium.temperature_phX(p_start, h_start, X_start) Type: Temperature (K) Description: Start value of temperature
h_start	Value: if use_T_start then Medium.specificEnthalpy_pTX(p_start, T_start, X_start) else Medium.h_default Type: SpecificEnthalpy (J/kg) Description: Start value of specific enthalpy
X_start	Value: Medium.X_default Type: MassFraction[Medium.nX] (kg/kg) Description: Start value of mass fractions m_i/m
C_start	Value: Medium.C_default Type: ExtraProperty[Medium.nC] Description: Start value of trace substances
height	Value: Type: Height (m) Description: Maximum level of tank before it overflows
crossArea	Value: Type: Area (m²) Description: Area of tank
V0	Value: 0 Type: Volume (m³) Description: Volume of the liquid when level = 0
p_ambient	Value: system.p_ambient Type: AbsolutePressure (Pa) Description: Tank surface pressure
T_ambient	Value: system.T_ambient Type: Temperature (K) Description: Tank surface Temperature
level_start	Value: 0.5 * height Type: Height (m) Description: Start value of tank level
nTopPorts	Value: 0 Type: Integer Description: Number of inlet ports above height (>= 1)
nPorts	Value: 0 Type: Integer Description: Number of inlet/outlet ports (on bottom and on the side)
portsData	Value: Type: VesselPortsData[nPorts] Description: Data of inlet/outlet ports at side and bottom of tank
use_HeatTransfer	Value: false Type: Boolean Description: = true, if HeatTransfer model is used
hysteresisFactor	Value: 0.1 Type: Real Description: Hysteresis for empty pipe = diameter*hysteresisFactor
stiffCharacteristicForEmptyPort	Value: false Type: Boolean Description: = true, if steep pressure loss characteristic for empty pipe port
zetaLarge	Value: 1e5 Type: Real Description: Large pressure loss factor if mass flows out of empty pipe port
m_flow_small	Value: system.m_flow_small Type: MassFlowRate (kg/s) Description: Regularization range at zero mass flow rate

Inputs (1)

fluidVolume	Default Value: V Type: Volume (m³) Description: Volume

fluidVolume

Default Value: V

Type: Volume (m³)

Description: Volume

Connectors (7)

	topPorts	Type: VesselFluidPorts_a[nTopPorts] Description: Inlet ports over height at top of tank (fluid flows only from the port in to the tank)
	ports	Type: VesselFluidPorts_b[nPorts] Description: Inlet/outlet ports at bottom or side of tank (fluid flows in to or out of port; a port might be above the fluid level)
	heatPort	Type: HeatPort_a Description: Thermal port for 1-dim. heat transfer (filled rectangular icon)
	portsData_diameter	Type: RealInput[nPorts] Description: 'input Real' as connector
	portsData_diameter2	Type: RealInput[nPorts] Description: 'input Real' as connector
	portsData_height	Type: RealInput[nPorts] Description: 'input Real' as connector
	portsData_height2	Type: RealInput[nPorts] Description: 'input Real' as connector

Components (4)

	system	Type: System Description: System properties
	medium	Type: BaseProperties Description: Base properties (p, d, T, h, u, R_s, MM and, if applicable, X and Xi) of a medium
	portsData	Type: VesselPortsData[nPorts] Description: Data of inlet/outlet ports at side and bottom of tank
	heatTransfer	Type: HeatTransfer Description: Wall heat transfer

Used in Examples (7)

	BatchPlant_StandardWater Modelica.Fluid.Examples.AST_BatchPlant Model of an experimental batch plant
	OneTank Modelica.Fluid.Examples.AST_BatchPlant.Test Tank with one time-varying top inlet mass flow rate and a bottom outlet into the ambient
	TwoTanks Modelica.Fluid.Examples.AST_BatchPlant.Test
	TankWithEmptyingPipe1 Modelica.Fluid.Examples.AST_BatchPlant.Test Demonstrates a tank with one constant top inlet mass flow rate and a bottom outlet into the ambient
	TankWithEmptyingPipe2 Modelica.Fluid.Examples.AST_BatchPlant.Test Demonstrates a tank with one constant top inlet mass flow rate and a bottom outlet into the ambient
	TanksWithEmptyingPipe1 Modelica.Fluid.Examples.AST_BatchPlant.Test Demonstrates a tank with one constant top inlet mass flow rate and a bottom outlet into the ambient
	TanksWithEmptyingPipe2 Modelica.Fluid.Examples.AST_BatchPlant.Test Demonstrates a tank with one constant top inlet mass flow rate and a bottom outlet into the ambient

Revisions

Dec. 12, 2008 by Rüdiger Franke: replace energy and mass balances with common definition in BaseClasses.PartialLumpedVolume
Dec. 8, 2008 by Michael Wetter (LBNL):
Implemented trace substances and missing equation for outflow of multi substance media at top port.
Jul. 29, 2006 by Martin Otter (DLR):
Improved handling of ports that are above the fluid level and simpler implementation.
Jan. 6, 2006 by Katja Poschlad, Manuel Remelhe (AST Uni Dortmund), Martin Otter (DLR):
Implementation based on former tank model but with several improvements (top, bottom, side ports; correctly treating kinetic energy for outlet and total dissipation for inlet; ports can be above the fluid level).