[Equest-users] SS-E or SS-R for Unmet Hours?

[Jennifer Jin]

Nick and Pasha,

Thanks a lot for your help. Now I have better understanding of unmet hourss 
and Equest reports.

Thanks,
Jennifer

________________________________
From: Nick Caton <ncaton at smithboucher.com>
To: Jennifer Jin <evergreen.building at yahoo.com>; Pasha Korber-Gonzalez 
<pasha.pkconsulting at gmail.com>
Cc: equest-users at lists.onebuilding.org
Sent: Mon, August 2, 2010 5:50:54 PM
Subject: RE: [Equest-users] SS-E or SS-R for Unmet Hours?


Jennifer,
 
To find your total unmet hours, per your original question, use SS-E in 
conjunction with the “unmet hours” percentage in the BEMP report.  A discussion 
from the not-so-far past is copied below (scroll to the bottom) wherein eQuest 
developer Scott Criswell laid down the law.
 
SS-R, F and O are collectively very useful for tracking down exactly when and 
where your unmet hours are occurring, to help track down what might be awry to 
resolve them, if you should desire/need to, as the “important note” explains.  I 
expect this is why Pasha is bringing SS-F to your attention.
 
SS-E however is what you’re working with to determine LEED unmet hours, 
however.  Plenty of further discussion as to why in the archives (search for 
‘coincidental unmet hours’).  Currently there’s no perfectly clean way to 
distinguish coincidental unmet heating vs. cooling hours, unless you get lucky 
and have zero of either.  I understand an approach when you have both is to take 
your total and proportion it out based on SS-R sums…
 
On a related note, an easier-to-digest view of both where the unmet hours are 
occurring (identifying the zone) and the unmet cooling/heating totals for each 
zone is available by clicking “Air Side HVAC” then “Summary” tabs after a 
calculation.  Highlight any one system in the tree to the left or click the top 
of the tree to see them all with sums at the bottom.  Unmet heating/cooling 
hours are summed for each zone – this happens to be a fast way to identify where 
a cryptically-named zone with unmet hours exists in your model, as well.
 
Best of luck!
 
~Nick
 
 
NICK CATON, E.I.T.
PROJECT ENGINEER
25501 west valley parkway
direct 913 344.0036
fax 913 345.0617
Check out our new web-site @ www.smithboucher.com
olathe ks 66061
 
From:equest-users-bounces at lists.onebuilding.org 
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jennifer Jin
Sent: Monday, August 02, 2010 4:32 PM
To: Pasha Korber-Gonzalez
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] SS-E or SS-R for Unmet Hours?
 
Pasha,
 
Thanks a lot . I looked at the document and on page 126, it says: To calculate 
the total number of hours outside the throttling rage, multiply the percentage 
reported here by the" Hours Fans on" reported on SS-E", But on the same page, 
under "important note: it also says: To investigate any hours outside the 
throttling range, see SS-R, then SS-F and SS-O to isolate the system & zone 
(SS-R), time of year (SS-F) and time of day (SS-O) the control problems occur." 

So I am a little confused here.
 
Thanks,
Jennifer
 
 

________________________________

From:Pasha Korber-Gonzalez <pasha.pkconsulting at gmail.com>
To: Jennifer Jin <evergreen.building at yahoo.com>
Cc: equest-users at lists.onebuilding.org
Sent: Mon, August 2, 2010 4:20:48 PM
Subject: Re: [Equest-users] SS-E or SS-R for Unmet Hours?



Hi Jennifer,
 
I suggest the SS-F report, not SS-E.   Take a look at the attached document, 
this should help you understand the reports better and what information they 
contain.  I use this reference document ALL the time to help me analyze and QC 
check my models.
 
Let us know if you have more questions.
Pasha
On Mon, Aug 2, 2010 at 12:24 PM, Jennifer Jin <evergreen.building at yahoo.com> 
wrote:
Pasha,
 
Thanks for your quick response. SS-E report provides the annual total fas run 
hours (not a zone level), will that be sufficient for a LEED submittal?
 
Thanks,
Jennifer
 

________________________________

From:Pasha Korber-Gonzalez <pasha.pkconsulting at gmail.com>
To: Jennifer Jin <evergreen.building at yahoo.com>
Cc: equest-users at lists.onebuilding.org
Sent: Mon, August 2, 2010 2:18:08 PM
Subject: Re: [Equest-users] SS-E or SS-R for Unmet Hours?
 
Jennifer,
 
start with looking at both SS-F (for each zone in your model) and SS-R for each 
system in your model.  You'll need to use them both simultaneously to start 
understanding what your model is OR is not doing.
 
Pasha
On Mon, Aug 2, 2010 at 12:05 PM, Jennifer Jin <evergreen.building at yahoo.com> 
wrote:
Hi Every one,
 
I have a project which use heat pump for a two story office building. Which 
report should I use to get unmet hours, SS-E or SS-R? 

 
Many thanks,
 
Jennifer
 
 

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From:Scott Criswell [mailto:scott.criswell at doe2.com] 
Sent: Tuesday, October 27, 2009 11:09 AM
To: Rosenberg, Michael I
Cc: ashu gupta; Nick Caton; Crockett, Jim; Kendra Tupper; 
bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Ashrae 90.1 - Unmet hours
 
I can confirm Mike's understanding of the DOE-2/eQUEST results.  To get the 
correct number of hours of unmet loads, people should MULTIPLY the Percent hours 
outside throttling range from BEPS or BEPU by the total annual "hours fans on" 
listed in report SS-E.

One other comment re: Ashu's write-up - I believe that (for DOE-2/eQUEST) a zone 
temperature has to be more than one degree outside the throttling range for that 
hour to be counted as an hour outside throttling range.  So for a zone with a 
heating thermostat setpoint of 72 and a 2 degree throttling range (=> 71-73 
degree "throttling range"), the zone temperature would have to be LESS THAN 70 
in order for that hour to be counted.

related info -
We are contemplating a change to the Air-Side HVAC Summary view in the eQUEST 
interface to report this total number of hours as opposed to just the percent in 
the totals section at the bottom of the report.
We have also just in the past several days (thanks to the efforts of Steve 
Gates) added precision to the percent hours outside throttling range reported on 
BEPS & BEPU and ALSO added separate reporting of hours any zone is either under 
cooled or under heated, intended for reporting to LEED submission templates.  
Assuming no further changes (which is certainly not out of the question), future 
releases of DOE-2/eQUEST will report the following in the BEPS & BEPU reports:
         PERCENT OF HOURS ANY SYSTEM ZONE OUTSIDE OF THROTTLING RANGE =  4.45
         PERCENT OF HOURS ANY PLANT LOAD NOT SATISFIED                =  0.00
         HOURS ANY ZONE ABOVE COOLING THROTTLING RANGE                =    98
         HOURS ANY ZONE BELOW HEATING THROTTLING RANGE                =    25

- Scott


      
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