[Equest-users] Design Light Levels

[Arpan Bakshi]

 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 !




On Thu, Apr 21, 2011 at 1:13 PM, Carol Gardner <cmg750 at gmail.com> wrote:

> 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
>
> On Thu, Apr 21, 2011 at 8:25 AM, Jeremy Poling <
> Jeremy.Poling at transwestern.net> wrote:
>
>> From the help file:
>>
>>
>> LIGHT-SET-POINT1, LIGHT-SET-POINT2
>>
>> Give the desired illuminance level at LIGHT-REF-POINT1 and
>> 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. It is assumed that
>> this lighting level 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*
>>
>> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
>> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Arpan Bakshi
>> *Sent:* Thursday, April 21, 2011 10:17 AM
>> *To:* equest-users
>> *Subject:* [Equest-users] Design Light Levels
>>
>>
>>
>> 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.
>> --
>>
>>
>>
>>
>>
>> *Arpan Bakshi**  *LEED AP BD+C**
>>
>>
>>
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>>
>
>
> --
> Carol Gardner PE
>



-- 

*
*
*

Arpan Bakshi  LEED AP BD+C
*
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