[Equest-users] Reproducing Unmet Hours

[STEVE SAMENSKI]

Francisco ‹ thanks for responding.  Yes, Report SS-O gives you an hourly
summary.  The operating hours are divided into 5 degree bins, and this can¹t
be changed.  I¹ve found SS-O useful in two cases:
1. Diagnosing a case where a unit is undersized. (I work in a cooling
climate.)  SS-O will show a nice ³bell curve² peaking at or just past the
hottest part of the day.
2. Diagnosing an instance where the AC units aren¹t starting up early enough
in the morning.

The situation with my current model is a bit different.  The design engineer
has placed two thermal zones on opposite exposures (east and west) of the
building.  I can¹t get the system satisfied, despite the fact that it¹s
large enough.  Whichever zone has the T-stat is mostly (but not completely)
satisfied.  I believe the two zones won¹t be happy on the same AC, so I
wanted to prove that with an hour by hour analysis, contrasting the peak
temperatures for each zone.

I¹m going to try expanding the throttling range as recommended by John A. in
a previous response.  However, I¹m not completely sure that each thermal
zone can have it¹s own T-stat.

Steve Samenski, PE, LEED AP
http://equest-diary.livejournal.com/

On 2/15/10 3:36 AM, "Francisco Aguirre" <Francisco.Aguirre at arup.com> wrote:

> Steve
>  
> As far as I know you get an hourly temperature overview of your conflict zone
> in the SS-O report of the Simulation Output
>  
> Regards,
> Francisco Aguirre (Curro)
> Ingeniero Sostenibilidad
> Alcala 54, 28014 Madrid
> T +34 91 523 92 76
> F +34 91 521 85 75
> www.arup.com <http://www.arup.com/>
> P Please consider the environment before printing this e-mail
> 
>  
> 
> 
> From: equest-users-bounces at lists.onebuilding.org
> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of STEVE
> SAMENSKI
> Sent: sábado, 13 de febrero de 2010 23:59
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] Reproducing Unmet Hours
> 
> It seems I spend a great deal of time with eQuest trying to reduce unmet hours
> in a model.  One thing I¹ve tried is having eQuest produce an hourly report of
> a problem zone¹s temperature and T-stat setting, exporting the data to Excel
> and then searching it for patterns.  This approach has a few problems:
> 
> 1. I can barely figure out how  to create the hourly report I¹m looking for.
> The reporting function (in  the Detailed Data Edit mode, under Project & Site,
> Hourly Reports) isn¹t  very intuitive, and I can¹t find any documentation on
> it.  Has anyone  found the docs on this?  (I¹m currently working through the
> relevant  sections of the DOE 2-2 Dictionary, trying to cross reference
> between the  inputs to eQuest and the BDL file generated from those inputs.
> I¹m just  wondering if there¹s a short-cut somewhere.)
> 2. Once I get the data in  Excel and do some filtering, I can never get the
> exported data to match the  unmet hours found in report SS-R.  The Excel
> analysis seems to always  overstate the unmet hours.  Has anyone had any luck
> reproducing the SS-R  values?  Any ideas?
> 3. I¹d like to hear other  user¹s experience.  Do you find that resolving
> unmet hours is a  significant part of your modeling time?
> 
> Steve Samenski, PE, LEED AP
> ____________________________________________________________
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