[Equest-users] Reproducing Unmet Hours

[Francisco Aguirre]

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

 

________________________________

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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