[Equest-users] Reproducing Unmet Hours

[STEVE SAMENSKI]

John ‹ thanks for the tip on the throttling range.  I was able to reduce the
unmet hours by increasing the range from 2 degrees to 4 degrees in the
perimeter zones.

Demba ‹ As I read the help file, the throttling range is the same as the
dead band described in in 6.4.3.1.2 of Standard 90.1.

³The number of degrees that room temperature must change in order to go from
full heating to zero heating or from full cooling to zero cooling. The zone
temperature heating or cooling set point is assumed to be at the midpoint of
the throttling range. This keyword is appropriate to THERMOSTAT-TYPE =
PROPORTIONAL or REVERSE-ACTION only. ³

Since the heating or cooling setpoint is assumed to be at the midpoint of
the throttling range, then a throttling range of 10 degrees would correspond
to a dead band of  5 degrees.  Maybe tomorrow I¹ll see what that does to my
results.

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

On 2/15/10 3:42 PM, "Demba Ndiaye" <Demba.Ndiaye at setty.com> wrote:

> By dead band, do you mean the throttling range that eQuest defines? If so,
> there is a limit on how much you can increase it, due to the 5F minimum dead
> band requirements of the 90.1.
>  
> Demba.
>  
> 
> From: equest-users-bounces at lists.onebuilding.org
> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of John Aulbach
> Sent: Sunday, February 14, 2010 12:57 AM
> To: STEVE SAMENSKI; equest-users at lists.onebuilding.org
> Subject: Re: [Equest-users] Reproducing Unmet Hours
>  
> 
> Steve:
> 
>  
> 
> The NO. 1 thing I have found effective is to increase the deanband in the
> thermostat. I don't thin USGBC has any problem with that.
> 
>  
> 
> It also depends on wheather it is COOLING or HEATING unmet housers. Sometimes,
> you haven't provided a reheat vaule.
> 
>  
> 
> Try those first.
> 
>  
> 
> 
> From: STEVE SAMENSKI <steve at thespinnakergroupinc.com>
> To: equest-users at lists.onebuilding.org
> Sent: Sat, February 13, 2010 2:59:00 PM
> 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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