[Equest-users] Reproducing Unmet Hours

[John Aulbach]

Sorry - I "misspoke." Throttling range is correct.




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From: Francisco Aguirre <Francisco.Aguirre at arup.com>
To: STEVE SAMENSKI <steve at thespinnakergroupinc.com>; Demba Ndiaye <Demba.Ndiaye at setty.com>; equest-users at lists.onebuilding.org; John Aulbach <jra_sac at yahoo.com>
Sent: Tue, February 16, 2010 6:57:07 AM
Subject: RE: [Equest-users] Reproducing Unmet Hours


Steve,
 
My understanding is that deadband is not the same as throttle range. Deadband is the temperature range between the system being cooling to heating. See attached to clarify. 
 
Regards
Francisco



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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of STEVE SAMENSKI
Sent: martes, 16 de febrero de 2010 1:05
To: Demba Ndiaye; equest-users at lists.onebuilding.org; John Aulbach
Subject: Re: [Equest-users] Reproducing Unmet Hours

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.

“The 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. “

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 I’ll 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 I’ve tried is having eQuest produce an hourly report of a problem zone’s 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 I’m looking for.  The reporting function (in the Detailed Data Edit mode, under Project & Site, Hourly Reports) isn’t very intuitive, and I can’t find any documentation on it.  Has anyone found the docs on this?  (I’m 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.  I’m just wondering if there’s 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. I’d like to hear other user’s 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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