modelMetalWallFV
Generic metal wall model with Nw finite volumes
Extends from ThermoPower.Icons.MetalWall.
Information
Finite volumes 1D model of a generic wall for 1D heat exchangers.
The heat capacity of the wall is accounted for, and lumped half-way between the inner and outer surfaces.
The thermal resistance of the wall is optionally accounted for by setting WallRes = true; in that case, the total heat conductance of the outer and inner half-layers of the wall must then be set. For a flat (or approximately flat) wall with surface S, thickness d and conductivity lambda, both parameters are equal to 2*S*lambda/d.
Modelling options
The following options are available:
WallRes = false: the thermal resistance of the wall is neglected.WallRes = true: the thermal resistance of the wall is accounted for.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | Nw | 1 | Number of volumes on the wall ports |
| SI.Mass | M | Mass | |
| SI.SpecificHeatCapacity | cm | Specific heat capacity of metal | |
| SI.HeatCapacity | Cm | M*cm | Heat capacity of the wall |
| Boolean | WallRes | false | Wall thermal resistance accounted for |
| SI.ThermalConductance | UA_ext | 0 | Equivalent thermal conductance of outer half-wall |
| SI.ThermalConductance | UA_int | UA_ext | Equivalent thermal conductance of inner half-wall |
| Real | pi | Modelica.Constants.pi | |
| Initialisation | |||
| SI.Temperature | Tstartbar | 300 | Average temperature |
| SI.Temperature | Tstart1 | Tstartbar | Temperature start value - first volume |
| SI.Temperature | TstartN | Tstartbar | Temperature start value - last volume |
| SI.Temperature[Nw] | Tvolstart | Functions.linspaceExt(Tstart1, TstartN, Nw) | |
| ThermoPower.Choices.Init.Options | initOpt | system.initOpt | Initialisation option |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| ThermoPower.Thermal.DHTVolumes | int | Internal surface | |
| ThermoPower.Thermal.DHTVolumes | ext | External surface |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ThermoPower.System | system | System wide properties | |
| Units.AbsoluteTemperature[Nw] | Tvol | Volume temperatures |
Revisions
- 11 Jul 2014 by Francesco Casella:
Added support for wall resistance. - 30 May 2005 by Francesco Casella:
Initialisation support added. - 1 Oct 2003 by Francesco Casella:
First release.