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/DaysimTutorial.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@radiance-online.org [mailto:
radiance-general-bounces@radiance-online.org] *On Behalf Of *Victor Li
*Sent:* Thursday, May 21, 2009 5:13 AM
*To:* Radiance-general@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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