Hello All
I am looking through my INP trying to change design light levels for the
daylight sensors by keyword if possible.
I REALLY don't want to go back into wiz mode !!!
Anyone know if there is a keyword for this? Is it somehow set in the PD2, is
that why I don't see a foot-candle assignment in the INP?
Thank you.
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Arpan Bakshi LEED AP BD+C
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>From the help file:
LIGHT-SET-POINT1, LIGHT-SET-POINT2
Give the desired illuminance level at LIGHT-REF-POINT1 and
. It is assumed that this lighting level
LIGHT-REF-POINT2, respectively. Recommended values, which depend on type
of activity, occupant age, and other factors, may be found on p. 460ff
of the Lighting Handbook, Eighth Edition, 1995, Illuminating Engineering
Society of North America. Typical values are shown in Table 28
will be produced by the overhead electric lights at full output . These
setpoints may be chosen to be lower when the overhead lights provide
ambient lighting that is supplemented by task lighting. (The illuminance
from task lighting is not included in LIGHT-SET-POINT1 or
LIGHT-SET-POINT2.)
The two different keywords allow for two separate control zones within
each space/zone defined in the model.
Note: you can change this under the "Internal Loads" screen for each
zone, either by going to an individual zone or by using the spreadsheet
mode - it doesn't have to be done by editing the INP file.
If you want to have a place to adjust it easily or to look at parametric
analysis of results for different set points, create a global parameter
(e.g. "Daylight FC") of type "Numerical Value" and set it to your
current design set point. Then, in either spreadsheet mode or on the
daylighting tab for each zone, right click on the "Light Set Point (fc)"
value and "Edit/View User Expression". Type in #PA("Daylight FC").
Each time you change the value of that global parameter, either in the
interface or through a parametric analysis, each system set to use that
global parameter will also change.
Jeremy R. Poling, PE, LEED AP+BDC
Hi Arpan,
Somewhere it says that if you think you might want to look at daylighting,
always check the yes box in the Wizard. Then you will have all the input
lines you need. If Jeremy's instructions aren't enough, and you know how to
input an .inp deck, then open yours in Wordpad or Notepad and add this
string to each space you want to study daylighting in: Pleas note: the
numbers are DOE2 defaults and might not match what you want. Also, they were
located after the LOCATION = .. line in my .inp deck. Probably doesn't
matter, but hey...
DAYLIGHTING = YES
LIGHT-REF-POINT1 = ( 39.9, 10, 2.5 )
ZONE-FRACTION1 = 0.399
LIGHT-SET-POINT1 = 50
LTG-CTRL-METHOD1 = DefaultOrSpecified
VIEW-AZIMUTH = 90
Carol
Carol
For some reason my space definitions were missing the light-set-point
keyword, even though daylight was set to yes. In either case, Jeremy has a
good point. Sometimes we lose ourselves in our text files and forget eQUEST
has a more intuitive spreadsheet feature !
While text-level .inp edits are very macho and everything, I'd also
encourage checking the window interfaces first if you're in detailed...
in the case of space daylighting inputs, I find all options are pretty
well organized. You can tweak the sensor location and get a visual of
orientation/location in the background if necessary using these windows
also.
NICK CATON, E.I.T.