modelFlueGasZoneSingleTubeOwnMedia
Flue gas zone including a single water/steam tube as basis component for higher level flue gas zones
Information
This is a flue gas zone including a single water/steam tube as basis component for higher level flue gas zones
The flue gas flows perpendicular to the water/steam
- 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:
- Cross flow configurations (gas flow is perpendicular to water/steam flow)
| Author: | Haiko Steuer | SCD |
| Checked by: | ||
| Protection class: | free |
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 |
|---|---|---|---|
| Real | pi | Modelica.Constants.pi | |
| Integer | numberOfTubeNodes | 2 | Number of water nodes per tube |
| Integer | numberOfWallLayers | 3 | Number of wall layers |
| Modelica.Fluid.Types.HydraulicResistance | hydraulicResistance_gas | 2 | Hydraulic conductance (for gas pressure drop) |
| Real | cleanliness | 1.0 | Cleanliness factor |
| Real | heatloss | 0.5 | Heat loss to ambient in % |
| Real | R_s | 292.505 | |
| Inner heat transfer | |||
| SI.CoefficientOfHeatTransfer | alphaOffset | 0.5e3 | alpha offset (in case of verysimple=true) |
| Real | alphaFactor | 1.0 | Factor for state dependent alpha term (in case of verysimple=true) |
| Initialization › Water flow | |||
| Modelica.SIunits.MassFlowRate | m_flow_start | 19.05 | Total water/steam mass flow rate |
| SiemensPower.Units.AbsolutePressure | pIn_start | pOut_start + 2e5 | start value for inlet pressure |
| SiemensPower.Units.AbsolutePressure | pOut_start | 137e5 | start value for outlet pressure |
| SiemensPower.Units.SpecificEnthalpy | hIn_start | 500e3 | start value for inlet enthalpy |
| SiemensPower.Units.SpecificEnthalpy | hOut_start | hIn_start | start value for outlet enthalpy |
| Initialization › Gas | |||
| SiemensPower.Units.Pressure | pGas_start | 1.0e5 | Gas pressure |
| SiemensPower.Units.Temperature | TGasIn_start | 300.0 | Inlet gas temperature |
| SiemensPower.Units.Temperature | TGasOut_start | TGasIn_start | Outlet gas temperature |
| SiemensPower.Units.MassFlowRate | m_flowGas_start | 1 | Gas mass flow rate |
| 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 | metal | Tube wall properties | |
| No input | |||
| SI.Length | d_ch_Re | (if geoFins.finned then geoPipe.d_out else 0.5*pi*geoPipe.d_out) | |
| SI.Area | Ah | geoPipe.Nt*pi*geoPipe.d_out*geoPipe.L | Heat transfer area of unfinned tubes |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| SiemensPower.Interfaces.portGasIn | portGasIn | ||
| SiemensPower.Interfaces.portGasOut | portGasOut | ||
| SiemensPower.Interfaces.FluidPort_a | portIn | water inlet | |
| SiemensPower.Interfaces.FluidPort_b | portOut | water moutlet |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Temperature | T | ||
| SI.Temperature | TIn | ||
| SI.Temperature | TOut | ||
| SI.Pressure | p | ||
| SI.Pressure | pIn | ||
| SI.Pressure | pOut | ||
| SI.SpecificEnthalpy | hIn | ||
| SI.SpecificEnthalpy | hOut | ||
| SI.Density | dOut | ||
| SiemensPower.Components.Pipes.TubeOwnMedia | tube | ||
| SiemensPower.Utilities.HeatTransfer.HeatTransfer_constAlpha | heatTransfer | ||
| SiemensPower.Units.MassFlowRate | m_flowGas | Mass flow rate | |
| SiemensPower.Units.MassFlowRate | m_flow | Mass flow rate | |
| SiemensPower.Units.Temperature[numberOfTubeNodes] | TWall | ||
| SI.Volume | VGas | volume of gas layer | |
| SI.TemperatureDifference[numberOfTubeNodes] | dT | ||
| SiemensPower.Interfaces.portHeat | heatPortToWall | ||
| SI.HeatFlowRate | Q_flowToAmbient | Heat flow rates to ambient |
Revisions
- November 2007 by Haiko Steuer