modelStratifiedTank

Stratified buffer tank model

Information

This is a four-port tank model based on Buildings.Fluid.Storage.Stratified which includes the following features.

The two fluid ports suffixed with Top are connected to the fluid volume at the top of the tank.
The two fluid ports suffixed with Bot are connected to the fluid volume at the bottom of the tank.
A unique heat port is exposed as an external connector. It is meant to provide a uniform temperature boundary condition at the external surface of the tank (outside insulation).
The model outputs the temperature of the fluid volumes at the top and at the bottom of the tank.

Type	Name	Default	Description
Modelica.Units.SI.Volume	VTan		Tank volume
Modelica.Units.SI.Length	hTan		Height of tank (without insulation)
Modelica.Units.SI.Length	dIns		Thickness of insulation
Modelica.Units.SI.ThermalConductivity	kIns	0.04	Specific heat conductivity of insulation
Integer	nSeg	3	Number of volume segments
Assumptions
Boolean	allowFlowReversal	true	= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
Nominal condition
Modelica.Units.SI.MassFlowRate	m_flow_nominal		Nominal mass flow rate

Type	Name	Description
Modelica.Fluid.Interfaces.FluidPort_a	port_aTop	Inlet fluid port at tank top
Modelica.Fluid.Interfaces.FluidPort_b	port_bBot	Outlet fluid port at tank bottom
Modelica.Fluid.Interfaces.FluidPort_a	port_aBot	Inlet fluid port at tank bottom
Modelica.Fluid.Interfaces.FluidPort_b	port_bTop	Outlet fluid port at tank top
Modelica.Blocks.Interfaces.RealOutput	Ql_flow	Heat loss of tank (positive if heat flows from tank to ambient)
Modelica.Blocks.Interfaces.RealOutput	TTop	Fluid temperature at tank top
Modelica.Blocks.Interfaces.RealOutput	TBot	Fluid temperature at tank bottom
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a	heaPorAmb	Heat port at interface with ambient (outside insulation)

Type	Name	Description
Fluid.Storage.Stratified	tan	Stratified tank
Modelica.Thermal.HeatTransfer.Sensors.TemperatureSensor	senTBot	Tank bottom temperature
Modelica.Thermal.HeatTransfer.Sensors.TemperatureSensor	senTTop	Tank top temperature

Name	Description
Medium	Medium model