Lighting Schedule Error
Ben
I am utilizing the intgain.csv file generated by DAYSIM for daylight
dimming in an EnergyPlus simulation. However, it seems that there is
something wrong with the intgain file. I am getting a "1" for electric
lighting for a lot of hours that are not even occupied. For example, I
am running an occupancy of 9 to 5pm, but are several stretches of time
where there is a "1" from 9am to 5pm the next day, running all through
the night. Its like someone forgot to turn off the lights when they
left the office. This occurs from 9am Jan 1st to 5 pm Jan 2nd, 9am Jan
10th to 5pm Jan 11th, and from 9am Jan 12th to 5pm Jan 15th. The rest
of the file seems to be fine.
I ran the same simulation with a custom occupancy file for a bedroom
with the occupied hours being 6am to 9am and 8pm to 11pm. The error is
occurring more often and sporadically throughout the entire year.
Any ideas what I may be doing wrong?
Thanks,
Ben
Max D
Kind regards,
Max
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Ben Silverman
The occupancy file is fine. The occupancy in the intgain.csv output file from DAYSIM lines up correctly with the input .occ file.
It is the electric light dimming schedule that is wrong. The electric lighting dimming schedule that ranges from 0 to 1 (1 being 100% on) in the intgain.csv file, does not line up with the occupancy. There are many hours where there is no occupancy, but there is full lighting.
Ben
J. Alstan Jakubiec
By default DIVA is using a lighting control method /without/ an occupancy
sensor being accounted for, but it assumes that the occupants are
relatively aware of turning the lights off when they leave. That said,
there is a probabilistic function with a low likelihood that they will
forget to turn the lights off. I think this is what you are observing.
In DIVA-1.9, the DAYSIM/Lightswitch control system is not user-settable by
default because we are not actually reporting lighting energy use anywhere
(this is changing in the forthcoming DIVA-2.0). However the ability to
choose different control strategies can be enabled in the Metrics-HTML
file. I will post a version later today which re-enables this control if
you wish to eliminate such results and test different control strategies.
Forgive me if we have broached this subject before, but are you aware of
the impact of setting 'workplane sensors' in the model by right-clicking
the Nodes button?
Best,
Alstan
On Wed, 14 Mar 2012 13:36:57 -0400, Ben Silverman <bhsil...@gmail.com>
wrote:
Ben Silverman
The probabilistic function sounds like what I am seeing. Where can I find the Metrics-HTML file?
My understanding of the workplane sensors is that if used they become the illuminance sensor for the lighting and blinds schedule. If they are not used, then the nodes are used as the sensors. Is this correct? Do workplane sensors have the same probabilistic function built into them?
Thanks for the help,
Ben
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J. Alstan Jakubiec
The RadExport.html file is called by the Metrics function in DIVA-1.9, and
it can be found in C:\DIVA\Scripts\RadExport.html.
You can download a copy that lets different lighting controls be selected
from,
http://jakubiec.net/temp/RadExport.html
Your description of the workplane sensors is correct. The probabilistic
function is built into the control system itself, whether all nodes (no
workplane sensors) or one or more workplane sensors are selected.
Best,
Alstan
On Wed, 14 Mar 2012 16:48:02 -0400, Ben Silverman <bhsil...@gmail.com>
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