modelCenterOfGlass

Model for center of glass of a window construction

Extends from Buildings.HeatTransfer.Radiosity.BaseClasses.RadiosityTwoSurfaces (Model for the radiosity balance of a device with two surfaces).

Information

This is a model for the heat transfer through the center of the glass. The properties of the glazing system is defined by the parameter glaSys. The model contains these main component models:

an array of models glass for the heat conduction and the infrared radiative heat balance of the glass layers. There can be an arbitrary number of glass layers, which are all modeled using instances of Buildings.HeatTransfer.Windows.BaseClasses.GlassLayer.
an array of models gas for the gas layers. There is one model of a gas layer between each window panes. The gas layers are modeled using instances of Buildings.HeatTransfer.Windows.BaseClasses.GasConvection.

Note that this model does not compute heat conduction through the frame and it does not model the convective heat transfer at the exterior and interior surface. These models are implemented in Buildings.HeatTransfer.Windows.Window, Buildings.HeatTransfer.Windows.ExteriorHeatTransfer, and Buildings.HeatTransfer.Windows.InteriorHeatTransferConvective.

Parameters

Type	Name	Default	Description
Modelica.Units.SI.Area	A (from RadiosityTwoSurfaces)		Heat transfer area
Boolean	homotopyInitialization	true	= true, use homotopy method
Modelica.Units.SI.Angle	til		Surface tilt (only 90 degrees=vertical is implemented)
Buildings.HeatTransfer.Data.GlazingSystems.Generic	glaSys		Glazing system
Boolean	linearize	false	Set to true to linearize emissive power

Connectors

Type	Name	Description
Buildings.HeatTransfer.Interfaces.RadiosityInflow	JIn_a (from RadiosityTwoSurfaces)	Incoming radiosity at surface a
Buildings.HeatTransfer.Interfaces.RadiosityInflow	JIn_b (from RadiosityTwoSurfaces)	Incoming radiosity at surface b
Buildings.HeatTransfer.Interfaces.RadiosityOutflow	JOut_a (from RadiosityTwoSurfaces)	Outgoing radiosity at surface a
Buildings.HeatTransfer.Interfaces.RadiosityOutflow	JOut_b (from RadiosityTwoSurfaces)	Outgoing radiosity at surface b
Modelica.Blocks.Interfaces.RealInput	u	Input connector, used to scale the surface area to take into account an operable shading device
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a	glass_a	Heat port connected to the outside facing surface of the glass
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b	glass_b	Heat port connected to the room-facing surface of the glass
Modelica.Blocks.Interfaces.RealInput[nGlaLay]	QAbs_flow	Solar radiation absorbed by glass

Components

Type	Name	Default	Description
Buildings.HeatTransfer.Windows.BaseClasses.GlassLayer	glass		Window glass layer
Buildings.HeatTransfer.Windows.BaseClasses.GasConvection[nGlaLay - 1]	gas		Window gas layer

Revisions

May 24, 2022, by Jianjun Hu:
Changed the gas layer to be conditional.
This is for #3026.
April 14, 2020, by Michael Wetter:
Changed homotopyInitialization to a constant.
This is for IBPSA, #1341.
March 13, 2015, by Michael Wetter:
Changed assignment of nLay to avoid a translation error in OpenModelica.
July 25, 2014, by Michael Wetter:
Propagated parameter homotopyInitialization.
May 30, 2014, by Michael Wetter:
Removed undesirable annotation Evaluate=true.
July 9 2012, by Wangda Zuo:
Fixed a bug in the parameter assignment of the instance glass. Previously, the infrared emissivity of surface a was assigned to the surface b.
Sep. 3 2010, by Michael Wetter:
First implementation.