modelParallelFlowEvaporatorOwnMedia
Evaporator with parallel rows according to Cottam design
Information
This is an evaporator with parallel rows according to Cottam design
- The gas flow is modeled using a simple quasi stationary pressure drop.
- The water/steam flow and inner heat transfer is modeled using the
Components.Pipes.Tube model. - The outer heat transfer gas-metal can be chosen from
- Escoa correlation, see Chris Weierman, Correlations ease the selection of finned tubes, The Oil and Gas Journal, Sept. 6, 1976; Update (Fintube Corp. ESCOA Engineering Manual) from July 2002.
- Simple heat transfer with constant heat transfer coefficient.
The model restrictions are:
- see composits
| Author: | Haiko Steuer | SCD |
| Checked by: | ||
| Protection class: | free | |
| Used Dymola version: | 6.1 |
This model is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY. For details see disclaimer
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | numberOfTubeLayers | 1 | Number of tube layers |
| Integer | numberOfCellsPerLayer | 20 | Number of water/steam cells per tube layer |
| Integer | numberOfWallLayers | 3 | Number of wall layers |
| Real | cleanlinessFactor | 1.0 | |
| Real | heatloss | 0.5 | Heat loss to ambient in % |
| SI.Temperature | TGasIn_start | 390 | Inlet gas temperature |
| SI.Temperature | TGasOut_start | TGasIn_start | Outlet gas temperature |
| SI.SpecificEnthalpy | hOut_start | hIn_start | start value for outlet enthalpy |
| Geometry | |||
| SiemensPower.Utilities.Structures.FgzGeo | geoFGZ | Geometry of flue gas zone | |
| SiemensPower.Utilities.Structures.Fins | geoFins | Geometry of outer wall fins | |
| SiemensPower.Utilities.Structures.PipeGeo | geoPipe | Geometry of tubes | |
| Media | |||
| SiemensPower.Utilities.Structures.PropertiesMetal | propertiesMetal | Tube wall properties | |
| Mixer | |||
| Boolean | hasMixerVolume | false | |
| SI.Volume | V | 0.1 | |
| Splitter | |||
| Modelica.Fluid.Types.HydraulicResistance | hydrResistanceSplitterOut | 2000 | Hydraulic conductance |
| Initialization › Flue gas flow | |||
| SiemensPower.Units.MassFlowRate | m_flowGas_start | 228.68 | Flue gas mass flow rate |
| Initialization › Water flow | |||
| SiemensPower.Units.MassFlowRate | m_flow_start | 19.05 | Total water/steam mass flow rate |
| SI.AbsolutePressure | pIn_start | pOut_start + 2e5 | start value for inlet pressure |
| SI.AbsolutePressure | pOut_start | 137e5 | start value for outlet pressure |
| SI.SpecificEnthalpy | hIn_start | 500e3 | start value for inlet enthalpy |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| SiemensPower.Interfaces.FluidPort_b | portSteamOut | ||
| SiemensPower.Interfaces.FluidPort_a | portWaterIn | ||
| SiemensPower.Interfaces.portGasOut | portGasOut | ||
| SiemensPower.Interfaces.portGasIn | portGasIn |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SiemensPower.Components.FlueGasZones.FlueGasZoneSingleTubeOwnMedia | flueGasZone | ||
| SiemensPower.Components.Junctions.SplitterMixer | splitter | ||
| SiemensPower.Components.Junctions.SplitterMixer | mixer |
Contents
| Name | Description |
|---|---|
 outerHeatTransfer |
Revisions
- November 2007 by Haiko Steuer