Light Actuator control for lux levels in a zone

asked 2020-07-17 10:30:13 -0500

shifty21 gravatar image

updated 2020-08-16 16:25:41 -0500

Hi everyone, I am trying to control the lux levels in a room by artificial lights. I am using the Light actuator called Electric Power Level. But this doesnt seems to have any effect on the lux levels in the room. I am using Daylighting:ReferencePoint to calculate the lux inside the room. Can anyone please give some insights on this, whether I am doing it wrong or the light power is not supposed to have any effect on the lux levels.

Light1,                  !- Name
Thermal Zone 1,          !- Zone or ZoneList Name
Always On Discrete,      !- Schedule Name
LightingLevel,           !- Design Level Calculation Method
50,                      !- Lighting Level {W}
10.6562713125426,        !- Watts per Zone Floor Area {W/m2}
,                        !- Watts per Person {W/person}
,                        !- Return Air Fraction
,                        !- Fraction Radiant
,                        !- Fraction Visible
1,                       !- Fraction Replaceable
General;                 !- End-Use Subcategory

Light_actuator,          !- Name
Light1,                  !- Actuated Component Unique Name
Lights,                  !- Actuated Component Type
Electric Power Level;    !- Actuated Component Control Type
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EnergyPlus can control artificial lighting based on daylighting lux levels, but EnergyPlus doesn't know the position or the efficacy of the electric lights to calculate their contribution to lighting levels at a specific point. Not sure if that is what you are trying to do. The only way to impact reporting daylighting levels would be to use fenestration control object such as a shade.

David Goldwasser gravatar image David Goldwasser  ( 2020-07-17 12:24:39 -0500 )edit

This post is a good starting point, but if you search for "energyplus daylighting" on Unmet Hours you will find lots of related posts as well. I would also recommend reading the Input-Output Reference documentation for the daylighting controls object in EnergyPlus.

Aaron Boranian gravatar image Aaron Boranian  ( 2020-07-17 12:53:58 -0500 )edit