[Trace-users] Trace-users Digest, Vol 49, Issue 1

[Bob Fassbender]

Hi There-

It may interest you to consider that Demand in TRACE is determined by the
COOLING DESIGN day schedule. Often, this is set to Midnight-Midnight at
100%, a more proper schedule

The reason for using the cooling design schedule is because TRACE works in
1 hour intervals, while Demand charges are based off of 15 or 20 minute
intervals (which will be slightly higher than the peak average for 1 hour
in most cases).

So, Scott's explanation is the right way to proceed, but in this case, the
cooling design day schedule is what influences demand.

Good Luck,

Bob Fassbender
Energy-models.com

On Wed, Nov 7, 2012 at 3:09 PM,
<trace-users-request at lists.onebuilding.org>wrote:

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>    1. Lowering Demand for Energy Modeling (Ben)
>    2. Re: Lowering Demand for Energy Modeling (Scott Parker)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 7 Nov 2012 11:30:51 -0600
> From: "Ben" <bhollon at antella-inc.com>
> To: <trace-users at lists.onebuilding.org>
> Subject: [Trace-users] Lowering Demand for Energy Modeling
> Message-ID: <002701cdbd0d$a34c3f00$e9e4bd00$@antella-inc.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Would anyone have any thoughts/experience with lowering demand to line up
> with an energy model?
>
> Our consumption lines up nearly perfect, while demand is significantly
> larger in the summer months.
>
> Any ideas welcome!
>
> cid:image003.png at 01CDAB78.6524ACE0
> Ben Hollon EIT, LEEDR AP BD+C, MBA
> Mechanical Engineer
>  <mailto:bhollon at antella-inc.com> bhollon at antella-inc.com
> O. 816.421.0950 Ext - 104
> F. 816.249.2439
> M. 816.536.3434
>
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> ------------------------------
>
> Message: 2
> Date: Wed, 7 Nov 2012 18:53:42 +0000
> From: Scott Parker <sparker at aeieng.com>
> To: Ben <bhollon at antella-inc.com>, "trace-users at lists.onebuilding.org"
>         <trace-users at lists.onebuilding.org>
> Subject: Re: [Trace-users] Lowering Demand for Energy Modeling
> Message-ID:
>         <CDD24FBBB7660944A466B133EB5519C516FF8A85 at AEI-EX2.aeieng.lan>
> Content-Type: text/plain; charset="us-ascii"
>
> Ben,
>
> You mentioned that the demand is larger ... I am guessing that you mean
> larger in your model, but I am not sure (visa-versa if higher in actual
> measured building).  Since you mentioned that it is higher in summer I
> would check to see if the summer occupancy is like you expect or if (like a
> typical university building) the occupancy is lower in summer.
>
> It sounds like your daily load profile is much flatter than you have
> modeled.  For example, you could model 12 hours at 100% lights, people,
> plug load, etc. or model 12 hours at 75% and 12 hours at 25%.  Either way
> you can get the same consumption, but the demand will not be correct.  I
> have just given a simple example, and it is not quiet this simple since the
> load cannot be spread out exactly as I have noted and keep the exact same
> consumption.  However, this general idea will get you in the right
> direction ... flatter daily load profiles as defined by people, light and
> plug load schedules will help you keep the same consumption and reduce the
> demand.
>
> Scott
>
> From: trace-users-bounces at lists.onebuilding.org [mailto:
> trace-users-bounces at lists.onebuilding.org] On Behalf Of Ben
> Sent: Wednesday, November 07, 2012 12:31 PM
> To: trace-users at lists.onebuilding.org
> Subject: [Trace-users] Lowering Demand for Energy Modeling
>
> Would anyone have any thoughts/experience with lowering demand to line up
> with an energy model?
>
> Our consumption lines up nearly perfect, while demand is significantly
> larger in the summer months.
>
> Any ideas welcome!
>
> [cid:image003.png at 01CDAB78.6524ACE0]
> Ben Hollon EIT, LEED(r) AP BD+C, MBA
> Mechanical Engineer
> bhollon at antella-inc.com<mailto:bhollon at antella-inc.com>
> O. 816.421.0950 Ext - 104
> F. 816.249.2439
> M. 816.536.3434
>
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