[Radiance-general] Daysim Electirc Lighting energy calculation

[Victor Li]

Christopher Rush : Thank you so much!

1, I defined the occupancy time is from 8:00 to 17:00. The result from
Daysim is 1568 hours totally in a year. However, i calculated it which is
1827 hours. According to the descirption of Daysim tutorial. Occupants leave
two times, one in the morning and one in the afternoon for 30 mins each time
and leave in lunchtime for one hour. So there are 9 hours from 8:00 to 17:00
one day. And occupants leave for 2 hours totally each day. So there are 7
hours occupancy time each day. Therefore, for one week there are 35 hours
from monday to friday. There are 365 days one year which is 52 weeks plus
one day.  the occupancy time for one year would be 35*52+7=1827 hours, which
is different to 1568 hours from Daysim result.

By the way, i donnot know how to calculate the total annual hours of
electric lighting in Daysim and i didnot find in Daysim tutorial. Anyone can
tell me?

2, Christopher Rush mentioned the daylight level i donot understand it. The
daylight value is the sky illuminance outside or the illuminance in the
room?  if it is for the inside room. I difined many illimance point. So
which one can control the blinds?

In my building, there is no blinds. However, i donot have the "no blinds"
option in my Daysim. what is wrong?

3, I looked the tutorial. For user behavior. it defined the active and
passive for when the blinds and lighting are open and when thay are closed.
However, in Lighting and shading control system, its function is to define
when thay are open and according to which control system, manual or other
sensor. So the two have the same function. i am confused hwo the blinds and
electric lighting perform in Daysim?

4 any one can answer this question?

5 If i define a sensor point, is the whole lighting system controlled by the
only sensor point?  if i define two. How is the lighting system controlled?

2009/5/21 Christopher Rush <Christopher.Rush at arup.com>

>  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 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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