[Radiance-general] Daysim Electirc Lighting energy calculation

[Christopher Rush]

There is actually a Daysim forum that can be found in Google Groups. You
can probably get more advanced advice there, and the software authors
track that message board. I'll give some general comments:
 
First, take a look at the tutorial which may answer your questions
better than I can
http://irc.nrc-cnrc.gc.ca/ie/lighting/daylight/daysim/docs/DaysimTutoria
l.pdf
 
1. I'd recommend giving an example of the error you found to the Google
Group for review so it's more clear what the problem is.
 
2. I believe Daysim assumes that any time a daylight value over a
certain threshhold occurs that the user would draw the shades blinds and
cut the daylight value by an assumed percentage. If you're sure that
there will not be any shades there should be a "no blinds" option. 
 
3. The user behavior for active or passive use (or mix) basically
guesses whether occupants will actively raise blinds when glare is no
longer present or will be passive and leave them closed most of the day.
I assume it's similar for user behavior with respect to switching of
lights, but I'm not sure if that's based on daylight or occupancy.
 
The Lighting and shading controls should relate to any automated control
system for the blinds or electric lights.
 
4. Good question for the Daysim Google Group.
 
5. If you set a particular work plane sensor I believe it will predict
energy on that one particular sensor instead of some other behavior, but
check the tutorial for better explanation.

________________________________

From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of
Victor Li
Sent: Thursday, May 21, 2009 5:13 AM
To: Radiance-general at radiance-online.org
Subject: [Radiance-general] Daysim Electirc Lighting energy calculation


Dear:
 
I am using Daysim to calculate who much energy consumption for lighting
to compensate the daylight.
 
1, I found The total annual hours of occupancy at the work place and the
total annual hours of electric lighting are wrong. I calculated it by
hands according to the rules and methods from Tutorial. I found it is
different from the result of Daysim.
 
2, User Behaviour,   "Active" means "A user who operates the electric
lighting in relation to ambient daylight conditions"  I donot understand
what does "the ambient daylight conditions" mean here?  For blinds, If
there is no blinds or other shading devices in my building, how can i
set this for blinds?
 
3, Lighting and Shading control system.  For blinds control, I really
donot know what is the difference between set in "User Behaviour -
blinds use" and "Lighting and Shading control system - blinds control" ?
Likewise, if there is no blinds how can i set it?  For lighting control,
i tried the frist three types, which are "Manual on/off switch near the
door",  " Switch off occupancy sensor", and "switch on/off occupancy
sensor"  i didnot find any difference of the results between the three. 
 
4 in my building the electric lighting is only used when the daylight
does not meet the 300 lux requirement. so who can i select the lighting
control type?  is the " Photosensor controlled dimming system?
apropriate for my situation?
 
5 what is the function of "work plan sensor" 
 
i am new to Daysim so i have many questions  Hope you can help!  Thank
you very much!
 
Best Regards!
 
victor
 
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