[Equest-users] Supply fan kW for LEED Table 1.4

Wed Jul 22 09:21:44 PDT 2015

This is one of those common boilerplate reviewer mistakes I’ve seen time
and again.  Not understanding the nature of PSE/PSF peaks causes a variety
of similar misunderstandings (not isolated to fans).  On the bright side,
once you’ve handled such commentary once, for future cases you can usually
copy/paste your previous response with minimal editing.  The best comments
are easy comments!

For many large buildings with VAV systems and also notably for buildings
with a combination of different system types, there exists no meter report
concerning fan energy which can be leveraged to verify inputs circuitously
via “full load equivalent hours.”  *Sometimes* the meter outputs actually
work for this, but that’s the exception to the rule in my experience.

After double-checking to ensure there are no actual mistakes concerning
system operations, fan inputs, etc,  I typically craft a response starting
with an explanation/review of what the peak values shown on PSE/PSF are &
are not.  The peak values in these reports break out, for each month, the
portion energy drawn at the peak coincident hour *for that meter*.  That
may have little-to-zero correlation to the actual peak draw for the
simulated fans (or any other isolated enduse).  You’ll note the meter
reports provide a “maximum” peak value at the bottom (after the December
row).  I typically use these numbers for the EAp2 enduse reporting. These
values however are the maximum peak value from the 12 monthly peaks
reported for the corresponding column.  For the same reasons, this is not
necessarily the same value as the peak enduse draw independent of
everything else going on in the model.

I then would advise/clarify for the reviewer that the fan kW value reported
on SVA system reports for may be referenced *directly* to verify the
results of our fan power inputs (these values should match the value ‘Pfan’
reported/calculated for your baseline systems, and also the fan power
sourced for your proposed case systems, as reported on the EAp2 excel
template).  If I’m in a good mood, I’ll slap in some screenshots showing
the interface inputs and highlight a that portion of an SVA output to make
it plain as day in my response.

~Nick

*NICK CATON, P.E.*
*Owner*

*Caton Energy Consulting*
  603 N Ferrel

  Olathe, KS  66061

  office:  785.410.3317

www.catonenergy.com

*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
Behalf Of *Jones, Christopher
*Sent:* Wednesday, July 22, 2015 8:33 AM
*To:* Travis Miller; equest-users at lists.onebuilding.org
*Subject:* Re: [Equest-users] Supply fan kW for LEED Table 1.4

Especially for a VAV system.  The actual peak fan kW may never reach the
SV-A reported fan kW.  Silly reviewer.

[image: cid:image003.png at 01D09C46.E75BA0D0]

*Christopher Jones,* P.Eng.
Senior Engineer

*WSP Canada Inc.*

2300 Yonge Street, Suite 2300

Toronto, ON M4P 1E4
T +1 416-644-4226

F +1 416-487-9766

C +1 416-697-0065

www.wspgroup.com

*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
<equest-users-bounces at lists.onebuilding.org>] *On Behalf Of *Travis Miller
*Sent:* Wednesday, July 22, 2015 9:29 AM
*To:* equest-users at lists.onebuilding.org
*Subject:* [Equest-users] Supply fan kW for LEED Table 1.4

Which output report should be used when tabulating supply fan power in
Table 1.4 of the excel file for LEED submittal?

I initially tabulated this kW number from the SV-A reports, which is
different than the PS-E report. The PS-E report was used to fill out tables
EAp2-4 and EAp2-5 of the online template. The LEED reviewer picked up on
this and wants me to revise and resubmit.

I would assume that difference in these reports is due to the fact that the
total building demand kW for ventilation fans does not happen at the same
time that each individual system demand kW happens – is that a correct
assumption?

Thanks in advance for your help.

Travis

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