modelWall_ASHRAE140
Wall modell for ASHRAE 140 with absorbtion of solar radiation
Extends from AixLib.Obsolete.BaseClasses.ObsoleteModel.
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 |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| AixLib.ThermalZones.HighOrder.Components.Walls.BaseClasses.ConvNLayerClearanceStar | Wall | Wall | |
| Utilities.Interfaces.SolarRad_in | SolarRadiationPort | ||
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | port_outside | ||
| Modelica.Blocks.Interfaces.RealInput | WindSpeedPort | ||
| AixLib.ThermalZones.HighOrder.Components.Sunblinds.Sunblind | Sunblind | ||
| AixLib.ThermalZones.HighOrder.Components.WindowsDoors.Door | Door | ||
| Utilities.HeatTransfer.HeatConvOutside | heatTransfer_Outside | ||
| Utilities.Interfaces.Adaptors.ConvRadToCombPort | heatStarToComb | ||
| Utilities.Interfaces.ConvRadComb | thermStarComb_inside | ||
| Modelica.Blocks.Interfaces.RealInput | solarRadWin | solar raditaion through window | |
| Modelica.Blocks.Math.Gain | solarDistrFraction | interior solar distribution factors | |
| Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlow | absSolarRadWin | absorbed solar radiation through window | |
| Modelica.Blocks.Interfaces.RealOutput | solarRadWinTrans | Output signal connector | |
| 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.