[Equest-users] Values choosing of the typical equipment &miscellaneous power densities.

[Nick Caton]

Generally, the "correct" baseline model values for these entries
(misc/plug loads and occupancy/ventilation) are to match whatever is in
the proposed model.

 

There is more than one "correct" approach regarding misc load quantities
for the proposed model.  In any case you should be prepared to reproduce
what decision you made and back it up for baseline/proposed
documentation:

-          Reference tables in the 90.1 users manual (also found in
certain state energy codes) with representative W/SF figures for various
'whole building' types and assign that figure to each space.  I've found
this approach to be time-efficient and so far totally accepted by the
USGBC/LEED reviewers.

-          Stick with the eQuest defaults per occupancy.  I'm unsure of
where they're all derived from exactly (Title 24?  Some other
standard/reference?), but they will vary as you change space activity
types and appear sensible from what I've observed.  These values,
default or otherwise, are rolled into a weighted average for each zone
group based on the % distribution in the zone group screen - which is
why the resulting W/SF coming out of the wizards can appear somewhat
random at first glance.

-          Flex your spreadsheet muscles and do a space-by-space plug
load takeoff to come up with an "actual" number.  I have never pursued
this degree of detail myself, but I understand others have specifically
to account for gains from providing efficient plug load equipment with
the project over "standard" equipment... resulting in a deliberate
divergence between the baseline/proposed models. 

 

I've found eQuest default values for occupant density/ventilation/loads
are pretty much on the mark as to what I'd define from ASHRAE
references, so I leave the defaults alone in wizards and only focus on
tweaking the calculated zone occupant quantities in detailed mode as
necessary for model QC and matching loads.  I do make a point to assign
the appropriate "space type percentages" for each zone in the following
wizard screens however.

 

~Nick

 

 

 

NICK CATON, P.E.

SENIOR ENGINEER

 

Smith & Boucher Engineers

25501 west valley parkway, suite 200

olathe, ks 66061

direct 913.344.0036

fax 913.345.0617

www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jiao,
Joey
Sent: Wednesday, September 28, 2011 4:59 AM
To: Equest-users at lists.onebuilding.org
Subject: [Equest-users] Values choosing of the typical equipment
&miscellaneous power densities.

 

Hi, Everyone:

I'm confused with the value choosing for the equipment & miscellaneous
power densities like the illustrate below.

The table G 3.1 no.12 said it should be based on the building and space
type, but there isn't other information. So do we need to add this load
part  when we make a baseline model? 

Maybe this isn't very important , but I want to make sure about it.

I know we can choosing the lighting power densities in Section 9, but I
can't find the table for other equipment. So what should you do?

 

 

By the way , about the occupancy density and ventilation inputs shown
below, I found  the reference information from ASHRAE 62.1, is that a
common way when we make a baseline? 

 

Thank you for your kindly help.

Best wishes.

 

Joey

------------------------------------------------------------------------
---

Joey Jiao

Graduate Engineer         

 

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