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Re: [EnergyPlus_Support] daylighting: dimmers vrs on/off controls

The trick with daylighting control is to try to predict the occupants 
behavior and reactions to the lighting control.  In general, the setpoint 
for on/off lighting control has to be significantly higher (more 
footcandles) than for continuous dimming control.  Occupants dislike a 
system that switches on and off many times a day.

The other factor is interior shades on the windows.  If they are occupant 
controlled, how do they affect the daylighting control when closed?  When 
do the occupants close the shades and do they open them again before the 
end of the day?

Dr. Christoph Reinhart at the National Research Council in Ottawa has done 
considerable research in this area.  You might want to contact him 
-  Christoph.Reinhart@xxxxxxxxxxxxxx.

At 08:45 3/18/2005, you wrote:

>Has anybody done an overall energy consumption comparison between
>dimmers and lights that go on/off?
>I made one, and it resulted with on/off controls being more energy-
>saving than dimmers (the E+ defaults were left intact, I only
>changed the control type). While logic might say that dimmers would
>consume less energy, I would like to know if I am in the right track.
>My simulation took into account also heating and cooling year round.
>The primary EnergyPlus web site is found at:
>The group web site is:
>Attachments are not allowed -- please post any files to the appropriate 
>folder in the Files area of the Support Web Site.
>Yahoo! Groups Links

Chris Jones
EnerSys Analytics Inc.
14 Oneida Avenue
Toronto, ON M5J-2E3
Tel. 416 203-7465
Fax. 416 946-1005  

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