[Equest-users] (no subject)

[Nick Caton]

There's much discussion on this in the archives, but basically the
difference is that BEPS/BEPU is reporting % of coincidental unmet hours
(when multiplied by the annual hours fans on in report SS-E), as we
intuitively think of it, whereas the SS-R reports are reporting unmet
hours for each zone without regard to coincidental unmet hours.  Summing
the SS-R reports may be the more intuitive approach, but you'll end up
with a conceptually different figure that can often be higher than the
figure found through BEPS/SS-R.

 

Note there's a degree of rounding involved when you only get a
percentage to so many decimal places.

 

As an example, if you had an imaginary model with only two zones which
were unmet all year long, BEPS would report 100% hours outside
throttling range, whereas adding up the SS-R report hours might lead you
to believe there are as many as 8,760*2 = 17,520 hours per year.

 

Therein lies the answer to why the numbers don't sync up after adding up
the SS-R figures.  For now, multiplying the BEPS figure by the annual
hours fans on is the best approach imho for documenting compliance with
the baseline/proposed unmet hours requirements.

 

It's been said the next released version of eQuest will present this
information more clearly in the BEPS/BEPU reports.

 

~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 Andrew
T McMurray
Sent: Tuesday, July 06, 2010 1:17 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] (no subject)

 

Hello Everyone,

 

I am trying to finalize a building model for a LEED submission but am
having difficulty getting the BEPS report "percent of hours any system
zone outside of throttling range" to match the SS-R reports "zone under
heated" and "zone under cooled" hours.  This was a complaint from the
LEED reviewer.

 

The building has three systems and all spaces are conditioned.  The BEPS
report lists hours outside of throttling range at 2% (175hrs), but the
SS-R report lists under heated and cooled hours of 280 (3.2%).  

 

I consider myself fairly familiar with equest but am unable to get these
two numbers to match.  Has anyone run into this problem in the past or
have any ideas of where I should be focusing my attention?

 

Many Thanks,

 

 

Andrew McMurray, EIT
P. A. Collins PE Consulting Engineers
15 West 26th Street, 5th Floor
New York, NY 10010
 
tel: 212.696.5294
fax: 212.696.5295
www.pacollinspe.com

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