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

[Nick Caton]

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

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

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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