modelExteriorHeatTransfer
Model for heat convection and radiation at the exterior surface of a window that may have a shading device
Extends from BaseClasses.PartialWindowBoundaryCondition (Partial model for heat convection or radiation between a possibly shaded window that can be outside or inside the room).
Information
Model for the convective heat transfer between a window shade, a window surface and the room air. This model is applicable for the outside-facing surface of a window system and can be used with the model Buildings.HeatTransfer.Windows.Window.
This model adds the convective heat transfer coefficient to its base model.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Area | A (from PartialWindowBoundaryCondition) | Heat transfer area of frame and window | |
| Real | fFra (from PartialWindowBoundaryCondition) | Fraction of window frame divided by total window area | |
| Modelica.Units.SI.Area | AFra (from PartialWindowBoundaryCondition) | fFra*A | Frame area |
| Modelica.Units.SI.Area | AGla (from PartialWindowBoundaryCondition) | A - AFra | Glass area |
| Boolean | linearizeRadiation | Set to true to linearize emissive power | |
| Real | vieFacSky | View factor from receiving surface to sky | |
| Shading | |||
| Boolean | haveExteriorShade (from PartialWindowBoundaryCondition) | Set to true if window has exterior shade (at surface a) | |
| Boolean | haveInteriorShade (from PartialWindowBoundaryCondition) | Set to true if window has interior shade (at surface b) | |
| Boolean | haveShade (from PartialWindowBoundaryCondition) | haveExteriorShade or haveInteriorShade | Set to true if window system has a shade |
| Boolean | thisSideHasShade (from PartialWindowBoundaryCondition) | Set to true if this side of the model has a shade | |
| Modelica.Units.SI.Emissivity | absIRSha_air | Infrared absorptivity of shade surface that faces air | |
| Modelica.Units.SI.Emissivity | absIRSha_glass | Infrared absorptivity of shade surface that faces glass | |
| Modelica.Units.SI.TransmissionCoefficient | tauIRSha_air | Infrared transmissivity of shade for radiation coming from the exterior or the room | |
| Modelica.Units.SI.TransmissionCoefficient | tauIRSha_glass | Infrared transmissivity of shade for radiation coming from the glass | |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | uSha (from PartialWindowBoundaryCondition) | Input connector, used to scale the surface area to take into account an operable shading device, 0: unshaded; 1: fully shaded | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | air (from PartialWindowBoundaryCondition) | Port that connects to the air (room or outside) | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b | glaUns (from PartialWindowBoundaryCondition) | Heat port that connects to unshaded part of glass | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b | glaSha (from PartialWindowBoundaryCondition) | Heat port that connects to shaded part of glass | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | frame (from PartialWindowBoundaryCondition) | Heat port at window frame | |
| Modelica.Blocks.Interfaces.RealInput | vWin | Wind speed | |
| Modelica.Blocks.Interfaces.RealInput | TBlaSky | Black body sky temperature | |
| Modelica.Blocks.Interfaces.RealInput | TOut | Outside temperature | |
| Interfaces.RadiosityOutflow | JOutUns | Outgoing radiosity that connects to unshaded part of glass | |
| Interfaces.RadiosityInflow | JInUns | Incoming radiosity that connects to unshaded part of glass | |
| Interfaces.RadiosityOutflow | JOutSha | Outgoing radiosity that connects to shaded part of glass | |
| Interfaces.RadiosityInflow | JInSha | Incoming radiosity that connects to shaded part of glass | |
| Modelica.Blocks.Interfaces.RealInput | QSolAbs_flow | Solar radiation absorbed by shade |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.HeatTransfer.Windows.BaseClasses.ExteriorConvectionCoefficient | conCoeGla | Model for the outside convective heat transfer coefficient of the glass | |
| Buildings.HeatTransfer.Windows.BaseClasses.ExteriorConvectionCoefficient | conCoeFra | Model for the outside convective heat transfer coefficient of the frame | |
| Radiosity.OutdoorRadiosity | radOut | Outdoor radiosity | |
| BaseClasses.ShadeRadiation | shaRad | Radiative heat balance of shade | |
| Modelica.Thermal.HeatTransfer.Components.Convection | conFra | Convective heat transfer between air and frame | |
| Modelica.Thermal.HeatTransfer.Components.Convection | conWinUns | Convection from unshaded part of window to outside or room air |
Revisions
-
March 2, 2015, by Michael Wetter:
Refactored model to allow a temperature dependent convective heat transfer on the room side. This is for issue 52. -
February 8 2012, by Michael Wetter:
Changed model to use new implementation of Buildings.HeatTransfer.Radiosity.OutdoorRadiosity. This change leads to the use of the same equations for the radiative heat transfer between window and ambient as is used for the opaque constructions. -
October 25 2010, by Michael Wetter:
First implementation.