modelZoneLwDistributionViewFactor

Internal longwave radiative heat exchange using view factors

Information

Computation of longwave radiative heat exchange based on view factors.

This implementation is only valid for rectangular geometries.

Verification test in IDEAS.Buildings.Validation.Tests.ViewFactorVerification.

Type	Name	Default	Description
Integer	nSurf		number of surfaces in contact with the zone
Modelica.Units.SI.Angle	incCeiling	IDEAS.Types.Tilt.Ceiling
Modelica.Units.SI.Angle	incFloor	IDEAS.Types.Tilt.Floor
Modelica.Units.SI.Angle	incWall	IDEAS.Types.Tilt.Wall
Modelica.Units.SI.Angle	aziSouth	IDEAS.Types.Azimuth.S
Integer	numAzi	4
Modelica.Units.SI.Length	hZone		Distance between floor and ceiling
Boolean	linearise	true	Linearise radiative heat exchange
Real	Umat
Linearisation
Modelica.Units.SI.Temperature	Tzone_nom	295.15	Nominal temperature of environment, used for linearisation
Modelica.Units.SI.TemperatureDifference	dT_nom	-2	Nominal temperature difference between solid and air, used for linearisation
Advanced
Real	vieFac		Emissivity weighted viewfactor from surface to surface
Real	vieFacTot		Emissivity weighted viewfactor from total of surfaces to each other

Type	Name	Description
Modelica.Blocks.Interfaces.RealInput	inc	Surface inclination angles
Modelica.Blocks.Interfaces.RealInput	azi	Surface azimuth angles
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a	port_a
Modelica.Blocks.Interfaces.RealInput	A	surface areas
Modelica.Blocks.Interfaces.RealInput	epsLw	longwave surface emissivities
Modelica.Blocks.Interfaces.RealOutput	floorArea	Amount of floor area for each surface

May 20, 2026 by Anna Dell'Isola:
Add noEvent in conditional expressions. See issue #1490.
January 19, 2017 by Filip Jorissen:
Updated icon for issue #641 .
January 19, 2017 by Filip Jorissen:
Added options for properly linearising heat exchange.
December 8, 2016 by Filip Jorissen:
Fixed indexing bug in algorithm.