modelNaturalIlluminance
Information
Natural illuminance transmitted to a zone and artificial lighting demand
Hypothesis and equations
From incident illuminance from each bay window, the luminous flux transmitted in direct, hemispherical and semi-hemispherical form are determined. Thus the equivalent luminous flux transmitted to the zone and the global natural lighting transmitted to the zone are deduced.
With a threshold of luminous autonomy, it's possible to determine the artifical lighting demand.
Bibliography
Method Th-BCE RT 2012
Instructions for use
none
Known limits / Use precautions
none
Validations
Validated model - Laura Sudries 05/2014
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Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : Laura SUDRIES, Vincent MAGNAUDEIX, EDF (2014)
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Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | S_gr | 100 | Total surface of the group (m²) |
| Real | Aecl_nat | 80 | Surface of the group with access to natural light (m²) |
| Real | PinstEcl | 1.4 | Conventional power lighting [W/m²] |
| Real | C1 | 0.9 | Lighting utilization rates in the absence of natural lighting |
| Real | EclNatRef | 200 | Reference natural illuminance for the room |
| Real | C2ref | 0.05 |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput[3] | FlumPlafond | Incident illuminance coming from the ceiling -direct -diffuse -reflected [lumen] | |
| Modelica.Blocks.Interfaces.RealInput[3] | FlumSud | Incident illuminance coming from the South facing window -direct -diffuse -reflected [lumen] | |
| Modelica.Blocks.Interfaces.RealInput[3] | FlumNord | Incident illuminance coming from the North facing window -direct -diffuse -reflected [lumen] | |
| Modelica.Blocks.Interfaces.RealInput[3] | FlumOuest | Incident illuminance coming from the West facing window -direct -diffuse -reflected [lumen] | |
| Modelica.Blocks.Interfaces.RealInput[3] | FlumEst | Incident illuminance coming from the East facing window -direct -diffuse -reflected [lumen] | |
| Modelica.Blocks.Interfaces.RealOutput | EclNat | Global natural illuminance transmitted to the group [lux] | |
| Modelica.Blocks.Interfaces.RealOutput | Pecl | Power lighting to supply [W] | |
| Modelica.Blocks.Interfaces.RealInput | Occupation | 1 = presence, 0 = absence | |
| Modelica.Blocks.Interfaces.RealInput | ConsigneEclairage | Use of artificial lighting (1 = Yes, 0 = No) |
Revisions
Benoît Charrier 05/2015 : ajout du flux lumineux incident venant du plafond