PartialFlowHeatTransferbase class for any pipe heat transfer correlation 
This information is part of the Modelica Standard Library maintained by the Modelica Association.
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.
n 
Value: 1 Type: Integer Description: Number of heat transfer segments 

use_k 
Value: false Type: Boolean Description: = true to use k value for thermal isolation 
k 
Value: 0 Type: CoefficientOfHeatTransfer (W/(m²·K)) Description: Heat transfer coefficient to ambient 
T_ambient 
Value: system.T_ambient Type: Temperature (K) Description: Ambient temperature 
nParallel 
Value: Type: Real Description: number of identical parallel flow devices 
states 
Type: ThermodynamicState[n] Description: Thermodynamic states of flow segments 

surfaceAreas 
Type: Area[n] (m²) Description: Heat transfer areas 
vs 
Type: Velocity[n] (m/s) Description: Mean velocities of fluid flow in segments 
lengths 
Type: Length[n] (m) Description: Lengths along flow path 
dimensions 
Type: Length[n] (m) Description: Characteristic dimensions for fluid flow (diameter for pipe flow) 
roughnesses 
Type: Roughness[n] (m) Description: Average heights of surface asperities 
Q_flows 
Type: HeatFlowRate[n] (W) Description: Heat flow rates 

heatPorts 
Type: HeatPorts_a[n] Description: Heat port to component boundary 

states 
Type: ThermodynamicState[n] Description: Thermodynamic states of flow segments 


system 
Type: System Description: System wide properties 
Modelica.Fluid.Pipes.BaseClasses.HeatTransfer Base class for pipe heat transfer correlation in terms of Nusselt number heat transfer in a circular pipe for laminar and turbulent onephase flow 

Modelica.Fluid.Pipes.BaseClasses.HeatTransfer ConstantHeatTransfer: Constant heat transfer coefficient 

Modelica.Fluid.Pipes.BaseClasses.HeatTransfer IdealHeatTransfer: Ideal heat transfer without thermal resistance 