modelReinhart2003Light
Extends from Modelica.Blocks.Icons.DiscreteBlock (Graphical layout of discrete block component icon).
Information
Model predicting the state of the lighting with the illuminance on the working plane and occupancy.
Dynamics
When the space is unoccupied, the light is always off. When the space is occupied, the probability to switch on the light depends on the illuminance level on the working plane. The lower the illuminance level, the higher the chance to switch on the lighting.
The probability to switch on the lighting is different when subjects just arrived and when subjects have stayed indoor for a while. The probability to switch lights is higher when subjects just arrived. Accordingly, two different probability functions have been applied.
The switch-off probability is found to be very low in this research, which may be because occupants failed to notice the lighting is on when the indoor daylight illuminance levels were high. Therefore, in this model, the lighting would be switched off only when the space is unoccupied.
References
The model is documented in the paper "Reinhart, C.F. and Voss, K., 2003. Monitoring manual control of electric lighting and blinds. Lighting research & technology, 35(3), pp.243-258."
The model parameters are regressed from the field study in 10 offices in Germany from Mar. to Dec. 2000.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | AArriv | -0.00238 | Upon arrival |
| Real | BArriv | -3.0965 | Upon arrival |
| Real | CArriv | 1.0157 | Upon arrival |
| Real | MArriv | 1.8536 | Upon arrival |
| Real | AInter | 0.0027 | intermediate |
| Real | BInter | -64.19 | intermediate |
| Real | CInter | 0.017 | intermediate |
| Real | MInter | 2.41 | intermediate |
| Integer | localSeed | 2004 | Local seed to be used to generate the initial state of the random number generator |
| Integer | globalSeed | 30129 | Global seed to be combined with the local seed |
| Modelica.Units.SI.Time | samplePeriod | 120 | Sample period |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | ill | Illuminance on the working planein units of lux | |
| Modelica.Blocks.Interfaces.BooleanInput | occ | Indoor occupancy, true for occupied | |
| Modelica.Blocks.Interfaces.BooleanOutput | on | State of lighting |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | pArriv | Probability of switch on the lighting upon arrival | |
| Real | pInter | Intermediate robability of switch on the lighting |
Revisions
-
December 6, 2024, by Michael Wetter:
Refactored implementation of random number calculations, transfering the local state of the random number generator from one call to the next.
This is for #4069. -
July 26, 2018, by Zhe Wang:
First implementation.