lighting-schedule&lighting-demand

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Dear eQUEST-Users,

this is a great community for troubleshooting in eQUEST.
So hopefully you can help me solving my problem with an eQUEST-model.

I have some serious trouble to model the lighting schedules of my baseline
building.
I defined the schedules as told from the client.

When I select some of the lighting schedules
(EXHIBIT,ARCHIVE,CONFER,KITCHEN,GARAGE) I get changes in lighting demand
over the year (Demand_Baseline_28f.pdf).
But this is not correct. They should not change, because each of the
lighting schedules are modeled the same each week and do not change over the
year.
When I deselect these schedules I get constant lighting demands over the
year (BASELINE_28e.pdf).
I can't find any mistake in the lighting schedules.

Anybody know how to solve this?
Please feel free to check my eQUEST-model.

Thanks,

Heinrich

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Heinrich,

I've found something that may help or be a red herring...

I tried running the simulation so I could view a few things in the spreadsheet views, but I didn't have the Dusseldorf weather file on-hand, so without changing anything else I substituted a local weather file I had on my computer for Kansas City, Missouri.

The results (see attached consumption/demand reports ) interestingly show the area lighting fluctuating a good deal more than the demand report you provided, suggesting whatever is off may be weather-dependant.

I do not see any daylighting specified for the interior lighting, which was my initial guess, so there I am at a loss! I'm not sure how else the modeled interior lighting loads may be affected by the weather file/site properties used (i.e. latitude/longitude)... Does "Area Lighting" cover more than interior lighting loads? Perhaps someone more experienced can comment...?

I'll be interested to hear your findings,

~Nick

PS: I'm unsure of whether a space being unoccupied might override any hourly values entered in a lighting schedule... I had a hunch this might be the case since you appeared to have a clean block of months with uniformly lowered demand. Even so, I think I've verified it cannot be a holiday scheduling issue by changing your custom holiday schedule to "No holidays," and still observing fluctuating area lighting loads.

NICK CATON, E.I.T.

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Nick,

thank you for you hints. But I don't have any idea in the moment.

I think it is something in the lighting-schedules
(EXHIBIT,ARCHIVE,CONFER,KITCHEN,GARAGE) that cause the problem, but I don't
know what it is.
If I change the lighting schedules for all zones to office-lighting-use
(OFFICE) there will be no fluctuating lighting loads.
If I add some other schedules e.g. corridor-use (CORRID,SERVER), as done for
BASELINE_28e, there will be no fluctuation either.

The weather-file is an IWEC-File generated with eQ_WthProc.
Fell free to use it.

Heinrich

Von: Nick Caton
Gesendet: Montag, 12. April 2010 17:46
An: heinrich at ib-bauklima.de; equest-users at lists.onebuilding.org
Betreff: Re: [Equest-users] lighting-schedule&lighting-demand

Heinrich,

I?ve found something that may help or be a red herring

I tried running the simulation so I could view a few things in the
spreadsheet views, but I didn?t have the Dusseldorf weather file on-hand, so
without changing anything else I substituted a local weather file I had on
my computer for Kansas City, Missouri.

The results (see attached consumption/demand reports ) interestingly show
the area lighting fluctuating a good deal more than the demand report you
provided, suggesting whatever is off may be weather-dependant.

I do not see any daylighting specified for the interior lighting, which was
my initial guess, so there I am at a loss! I?m not sure how else the
modeled interior lighting loads may be affected by the weather file/site
properties used (i.e. latitude/longitude)
Does ?Area Lighting? cover more
than interior lighting loads? Perhaps someone more experienced can
comment
?

I?ll be interested to hear your findings,

~Nick

PS: I?m unsure of whether a space being unoccupied might override any hourly
values entered in a lighting schedule... I had a hunch this might be the
case since you appeared to have a clean block of months with uniformly
lowered demand. Even so, I think I?ve verified it cannot be a holiday
scheduling issue by changing your custom holiday schedule to ?No holidays,?
and still observing fluctuating area lighting loads.

cid:489575314 at 22072009-0ABB

NICK CATON, E.I.T.

heinrich's picture
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Joined: 2011-04-30
Reputation: 0

Nick,
and to all eQUESTERs who are still wondering about my model-output.

It seems to be a bug in the generated demand-output of the eQUEST-run.
When I write out the hourly reports of the lighting loads there is no
monthly fluctuation in the peak lighting loads.
Please correct me if I'm wrong.

Heinrich

Von: Nick Caton
Gesendet: Montag, 12. April 2010 17:46
An: heinrich at ib-bauklima.de; equest-users at lists.onebuilding.org
Betreff: Re: [Equest-users] lighting-schedule&lighting-demand

Heinrich,

I?ve found something that may help or be a red herring

I tried running the simulation so I could view a few things in the
spreadsheet views, but I didn?t have the Dusseldorf weather file on-hand, so
without changing anything else I substituted a local weather file I had on
my computer for Kansas City, Missouri.

The results (see attached consumption/demand reports ) interestingly show
the area lighting fluctuating a good deal more than the demand report you
provided, suggesting whatever is off may be weather-dependant.

I do not see any daylighting specified for the interior lighting, which was
my initial guess, so there I am at a loss! I?m not sure how else the
modeled interior lighting loads may be affected by the weather file/site
properties used (i.e. latitude/longitude)
Does ?Area Lighting? cover more
than interior lighting loads? Perhaps someone more experienced can
comment
?

I?ll be interested to hear your findings,

~Nick

PS: I?m unsure of whether a space being unoccupied might override any hourly
values entered in a lighting schedule... I had a hunch this might be the
case since you appeared to have a clean block of months with uniformly
lowered demand. Even so, I think I?ve verified it cannot be a holiday
scheduling issue by changing your custom holiday schedule to ?No holidays,?
and still observing fluctuating area lighting loads.

cid:489575314 at 22072009-0ABB

NICK CATON, E.I.T.

heinrich's picture
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Joined: 2011-04-30
Reputation: 0

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Scott Criswell2's picture
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Scott,

Thank you for your hint.

So the the results module demand report shows different monthly lighting
loads according to coincident electrical peak end-use time.
PS-E-Report shows for each month identical non-coincident max lighting loads
and different coincident peak lighting loads at electric peak end-use time.
You can see that monthly coincident electrical peak end-use time is changing
during the year (16:00,15:00,12:00).

So it is no serious bug.
This a great site for trouble shooting eQUEST.

Heinrich

Von: Scott Criswell
Gesendet: Dienstag, 13. April 2010 01:55
An: Heinrich.ib-bauklima.de
Cc: 'Nick Caton'; equest-users at lists.onebuilding.org
Betreff: Re: [Equest-users] lighting-schedule&lighting-demand

This is not a bug - just a matter of understanding the results being
presented.
In the eQUEST results module Demand report, what you are looking at is the
breakdown of enduse energy use for the hour of highest overall coincident
electric (and gas) demand for each month. For any given month, the highest
coincident demand may or may not occur at a time when the lighting load is
at its peak. Hence the variation in monthly lighting demand results.
If this report indicated the peak non-coincident load for each enduse, then
you would see consistent lighting demand results, but their sum would not
(necessarily) add up to the building peak, since not all enduses are likely
to all peak at the same time from month to month.
If you review the PS-E report in the detailed simulation results you will
see both the peak coincident and non-coincident demand results listed for
each month.

- Scott

Heinrich.ib-bauklima.de wrote:

Nick,
and to all eQUESTERs who are still wondering about my model-output.

It seems to be a bug in the generated demand-output of the eQUEST-run.
When I write out the hourly reports of the lighting loads there is no
monthly fluctuation in the peak lighting loads.
Please correct me if I'm wrong.

Heinrich

Von: Nick Caton
Gesendet: Montag, 12. April 2010 17:46
An: heinrich at ib-bauklima.de; equest-users at lists.onebuilding.org
Betreff: Re: [Equest-users] lighting-schedule&lighting-demand

Heinrich,

I?ve found something that may help or be a red herring

I tried running the simulation so I could view a few things in the
spreadsheet views, but I didn?t have the Dusseldorf weather file on-hand, so
without changing anything else I substituted a local weather file I had on
my computer for Kansas City, Missouri.

The results (see attached consumption/demand reports ) interestingly show
the area lighting fluctuating a good deal more than the demand report you
provided, suggesting whatever is off may be weather-dependant.

I do not see any daylighting specified for the interior lighting, which was
my initial guess, so there I am at a loss! I?m not sure how else the
modeled interior lighting loads may be affected by the weather file/site
properties used (i.e. latitude/longitude)
Does ?Area Lighting? cover more
than interior lighting loads? Perhaps someone more experienced can
comment
?

I?ll be interested to hear your findings,

~Nick

PS: I?m unsure of whether a space being unoccupied might override any hourly
values entered in a lighting schedule... I had a hunch this might be the
case since you appeared to have a clean block of months with uniformly
lowered demand. Even so, I think I?ve verified it cannot be a holiday
scheduling issue by changing your custom holiday schedule to ?No holidays,?
and still observing fluctuating area lighting loads.

cid:489575314 at 22072009-0ABB

NICK CATON, E.I.T.

heinrich's picture
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Joined: 2011-04-30
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