Modelica.Fluid.Pipes.BaseClasses.HeatTransfer

Heat transfer for flow models

Information


Heat transfer correlations for pipe models

Extends from Modelica.Icons.Package (Icon for standard packages).

Package Content

NameDescription
Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.PartialFlowHeatTransfer PartialFlowHeatTransfer base class for any pipe heat transfer correlation
Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.IdealFlowHeatTransfer IdealFlowHeatTransfer IdealHeatTransfer: Ideal heat transfer without thermal resistance
Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.ConstantFlowHeatTransfer ConstantFlowHeatTransfer ConstantHeatTransfer: Constant heat transfer coefficient
Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.PartialPipeFlowHeatTransfer PartialPipeFlowHeatTransfer Base class for pipe heat transfer correlation in terms of Nusselt number heat transfer in a circular pipe for laminar and turbulent one-phase flow
Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.LocalPipeFlowHeatTransfer LocalPipeFlowHeatTransfer LocalPipeFlowHeatTransfer: Laminar and turbulent forced convection in pipes, local coefficients

Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.PartialFlowHeatTransfer Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.PartialFlowHeatTransfer

base class for any pipe heat transfer correlation

Information


Base class for heat transfer models of flow devices.

The geometry is specified in the interface with the surfaceAreas[n], the roughnesses[n] and the lengths[n] along the flow path. Moreover the fluid flow is characterized for different types of devices by the characteristic dimensions[n+1] and the average velocities vs[n+1] of fluid flow. See Pipes.BaseClasses.CharacteristicNumbers.ReynoldsNumber for example definitions.

Extends from Modelica.Fluid.Interfaces.PartialHeatTransfer (Common interface for heat transfer models).

Parameters

NameDescription
Ambient
kHeat transfer coefficient to ambient [W/(m2.K)]
T_ambientAmbient temperature [K]
Internal Interface
replaceable package MediumMedium in the component
nNumber of heat transfer segments
use_k= true to use k value for thermal isolation
Geometry
nParallelnumber of identical parallel flow devices

Connectors

NameDescription
heatPorts[n]Heat port to component boundary

Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.IdealFlowHeatTransfer Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.IdealFlowHeatTransfer

IdealHeatTransfer: Ideal heat transfer without thermal resistance

Information


Ideal heat transfer without thermal resistance.

Extends from PartialFlowHeatTransfer (base class for any pipe heat transfer correlation).

Parameters

NameDescription
Ambient
kHeat transfer coefficient to ambient [W/(m2.K)]
T_ambientAmbient temperature [K]
Internal Interface
replaceable package MediumMedium in the component
nNumber of heat transfer segments
use_k= true to use k value for thermal isolation
Geometry
nParallelnumber of identical parallel flow devices

Connectors

NameDescription
heatPorts[n]Heat port to component boundary

Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.ConstantFlowHeatTransfer Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.ConstantFlowHeatTransfer

ConstantHeatTransfer: Constant heat transfer coefficient

Information


Simple heat transfer correlation with constant heat transfer coefficient, used as default component in distributed pipe models.

Extends from PartialFlowHeatTransfer (base class for any pipe heat transfer correlation).

Parameters

NameDescription
alpha0heat transfer coefficient [W/(m2.K)]
Ambient
kHeat transfer coefficient to ambient [W/(m2.K)]
T_ambientAmbient temperature [K]
Internal Interface
replaceable package MediumMedium in the component
nNumber of heat transfer segments
use_k= true to use k value for thermal isolation
Geometry
nParallelnumber of identical parallel flow devices

Connectors

NameDescription
heatPorts[n]Heat port to component boundary

Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.PartialPipeFlowHeatTransfer Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.PartialPipeFlowHeatTransfer

Base class for pipe heat transfer correlation in terms of Nusselt number heat transfer in a circular pipe for laminar and turbulent one-phase flow

Information


Base class for heat transfer models that are expressed in terms of the Nusselt number and which can be used in distributed pipe models.

Extends from PartialFlowHeatTransfer (base class for any pipe heat transfer correlation).

Parameters

NameDescription
alpha0guess value for heat transfer coefficients [W/(m2.K)]
Ambient
kHeat transfer coefficient to ambient [W/(m2.K)]
T_ambientAmbient temperature [K]
Internal Interface
replaceable package MediumMedium in the component
nNumber of heat transfer segments
use_k= true to use k value for thermal isolation
Geometry
nParallelnumber of identical parallel flow devices

Connectors

NameDescription
heatPorts[n]Heat port to component boundary

Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.LocalPipeFlowHeatTransfer Modelica.Fluid.Pipes.BaseClasses.HeatTransfer.LocalPipeFlowHeatTransfer

LocalPipeFlowHeatTransfer: Laminar and turbulent forced convection in pipes, local coefficients

Information


Heat transfer model for laminar and turbulent flow in pipes. Range of validity:

The correlation takes into account the spatial position along the pipe flow, which changes discontinuously at flow reversal. However, the heat transfer coefficient itself is continuous around zero flow rate, but not its derivative.

References

Verein Deutscher Ingenieure (1997):
VDI Wärmeatlas. Springer Verlag, Ed. 8, 1997.

Extends from PartialPipeFlowHeatTransfer (Base class for pipe heat transfer correlation in terms of Nusselt number heat transfer in a circular pipe for laminar and turbulent one-phase flow).

Parameters

NameDescription
alpha0guess value for heat transfer coefficients [W/(m2.K)]
Ambient
kHeat transfer coefficient to ambient [W/(m2.K)]
T_ambientAmbient temperature [K]
Internal Interface
replaceable package MediumMedium in the component
nNumber of heat transfer segments
use_k= true to use k value for thermal isolation
Geometry
nParallelnumber of identical parallel flow devices

Connectors

NameDescription
heatPorts[n]Heat port to component boundary

Automatically generated Mon Sep 23 17:20:46 2013.