modelWall_ASHRAE140
Wall modell for ASHRAE 140 with absorbtion of solar radiation
Extends from AixLib.Obsolete.BaseClasses.ObsoleteModel (Icon for classes that are obsolete and will be removed in later versions).
Information
Overview
Flexible Model for Inside Walls and Outside Walls.
Concept
The Wall model models
- Conduction and convection for a wall (different on the inside surface depending on the surface orientation: vertical wall, floor or ceiling)
- Outside walls may have a window and/ or a door
- Inside walls may have a door
This model uses a HeatStarComb Connector for an easier connection of temperature and radiance inputs.
Assumputions
- Outside walls are represented as complete walls
- Inside walls are modeled as a half of a wall, you need to connect a corresponding second half with the same values
- Door and window got a constant U-value
- No heat storage in doors or window
Have a closer look at the used models to get more information about the assumptions.
Example Results
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| AixLib.DataBase.Walls.WallBaseDataDefinition | WallType | ||
| Real | solarDistribution | 0.038 | Solar distribution fraction of the transmitted radiation through the window on the surface |
| Modelica.Units.SI.Area | clearance | if not (outside) and withDoor then door_height*door_width else if outside and withDoor and withWindow then (windowarea + door_height*door_width) else if outside and withWindow then windowarea else if outside and withDoor then door_height*door_width else 0 | Wall clearance |
| General Wall Type Parameter | |||
| Boolean | outside | true | Choose if the wall is an outside or an inside wall |
| Dynamics › Equations | |||
| Modelica.Fluid.Types.Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamics.DynamicFreeInitial | Type of energy balance: dynamic (3 initialization options) or steady state |
| Room Geometry | |||
| Modelica.Units.SI.Length | wall_length | 2 | Length of wall |
| Modelica.Units.SI.Height | wall_height | 2 | Height of wall |
| Surface Parameters › Outside surface | |||
| Real | solar_absorptance | 0.25 | Solar absorptance coefficient of outside wall surface |
| Integer | calcMethodOut | 1 | Calculation method for convectice heat transfer coeffient at outside surface |
| Modelica.Units.SI.CoefficientOfHeatTransfer | hCon_const | 25 | Custom convective heat transfer coefficient (just for manual selection, not recommended) |
| AixLib.DataBase.Surfaces.RoughnessForHT.PolynomialCoefficients_ASHRAEHandbook | surfaceType | AixLib.DataBase.Surfaces.RoughnessForHT.Brick_RoughPlaster() | Surface type of outside wall |
| Surface Parameters › Inside surface | |||
| Integer | ISOrientation | 1 | Inside surface orientation |
| Window | |||
| Boolean | withWindow | false | Choose if the wall has got a window (only outside walls) |
| AixLib.DataBase.WindowsDoors.Simple.OWBaseDataDefinition_Simple | WindowType | AixLib.DataBase.WindowsDoors.Simple.WindowSimple_EnEV2009() | Choose a window type from the database |
| Modelica.Units.SI.Area | windowarea | 2 | Area of window |
| Boolean | withSunblind | false | enable support of sunblinding? |
| Real | Blinding | 0 | blinding factor: 0 means total blocking of solar irradiation |
| Real | LimitSolIrr | Minimum specific total solar radiation in W/m2 for blinding becoming active (see also TOutAirLimit) | |
| Modelica.Units.SI.Temperature | TOutAirLimit | Temperature at which sunblind closes (see also LimitSolIrr) | |
| Door | |||
| Boolean | withDoor | false | Choose if the wall has got a door |
| Modelica.Units.SI.CoefficientOfHeatTransfer | U_door | 1.8 | Thermal transmission coefficient of door |
| Modelica.Units.SI.Emissivity | eps_door | 0.9 | Solar emissivity of door material |
| Modelica.Units.SI.Length | door_height | 2 | |
| Modelica.Units.SI.Length | door_width | 1 | |
| Initialization | |||
| Modelica.Units.SI.Temperature | T0 | Modelica.Units.Conversions.from_degC(20) | Initial temperature |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Utilities.Interfaces.SolarRad_in | SolarRadiationPort | ||
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | port_outside | ||
| Modelica.Blocks.Interfaces.RealInput | WindSpeedPort | ||
| Utilities.Interfaces.ConvRadComb | thermStarComb_inside | ||
| Modelica.Blocks.Interfaces.RealInput | solarRadWin | solar raditaion through window | |
| Modelica.Blocks.Interfaces.RealOutput | solarRadWinTrans | Output signal connector |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| AixLib.ThermalZones.HighOrder.Components.Walls.BaseClasses.ConvNLayerClearanceStar | Wall | Wall | |
| AixLib.ThermalZones.HighOrder.Components.Sunblinds.Sunblind | Sunblind | ||
| AixLib.ThermalZones.HighOrder.Components.WindowsDoors.Door | Door | ||
| Utilities.HeatTransfer.HeatConvOutside | heatTransfer_Outside | ||
| Utilities.Interfaces.Adaptors.ConvRadToCombPort | heatStarToComb | ||
| Modelica.Blocks.Math.Gain | solarDistrFraction | interior solar distribution factors | |
| Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlow | absSolarRadWin | absorbed solar radiation through window | |
| Modelica.Blocks.Math.Gain | AbscoeffA | multiplication withabsorbtioncoefficient and area | |
| Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlow | absSolarRadWall | absorbed solar radiation on wall | |
| Modelica.Blocks.Sources.RealExpression | SolarRadTotal | ||
| Modelica.Thermal.HeatTransfer.Sensors.TemperatureSensor | tempOutAirSensor | Outdoor air (dry bulb) temperature sensor | |
| Window | window |
Contents
| Name | Description |
|---|---|
 Window |
Revisions
-
July 25, 2014 by Ana Constantin:
Corrected activation of door for an outside wall -
Mai 19, 2014 by Ana Constantin:
Uses components from MSL and respects the naming conventions -
May 02, 2013 by Ole Odendahl:
Formatted documentation appropriately -
June 22, 2012 by Lukas Mencher:
Outside wall may have a door now, icon adjusted -
Mai 24, 2012 by Ana Constantin:
Added inside surface orientation -
April, 2012 by Mark Wesseling:
Implemented.