modelShadowEffect

Shadow effect of horizotal shield, reducing the solar radiation through the window

Information

Overview

This model represents the reducing effect of solar radiation caused by the shadow on the window surface.

Concept

The model calculates the ratio of the shadow on the window glazing area to determine the radiation reduction.

For the area without shadow, the solar radiation remains unchanged.
For the area with shadow, the direct radiation is reduced to zero, the diffuse radiation is reduced according to the defined type.

Assumptions

The diffuse radiation has a vertical incident angle between 0° (horizontal to the ground) and 90° (vertical to the ground, upward).
The reduction of reflected radiation is not considered.

Example Results

Type	Name	Default	Description
AixLib.ThermalZones.HighOrder.Components.Shadow.Types.selectorShadowEffectMode	calMod		Diffuse radiation calculation mode: {constRedDiffAllDir, constRedDiffPerpDir, varRedDiffAsDirRad}
Modelica.Units.SI.Length	lenShie	0.3	Horizontal length of the sun shield
Modelica.Units.SI.Length	heiWinMin	0.1	Distance from shield to upper border of window
Modelica.Units.SI.Length	heiWinMax	1.1	Distance from shield to lower border of window
Modelica.Units.NonSI.Angle_deg	aziDeg	-54	Surface azimuth, S=0°, W=90°, N=180°, E=-90°
Real	redFacDifRad	1	Reduce factor of shadow effect for diffuse radiation: 0=fully reduced, 1=no addtional reduce
Integer	N	100	Number of discretisation angles to calculate the shadow factor

Type	Name	Description
BoundaryConditions.WeatherData.Bus	weaBus	Weather bus
Utilities.Interfaces.SolarRad_in	solRadIn
Utilities.Interfaces.SolarRad_out	solRadOut

Type	Name	Default	Description
ShadowLength	shaLen
Modelica.Units.SI.TransmissionCoefficient	gShaDir		Shadow coefficient for direct radiation: 0=full shadowed, 1=no shadow