[BLDG-SIM] Process Loads and LEED

[David S Eldridge]

Varkie, I can see merits for the 2.1 method and the 2.2 method.  On the
one hand, the process loads are to some degree out of our control.  But
on the other hand, if you have a building with such massive load density
why would the rating system want to exclude all of that energy from
sustainable practices?
 
I like the idea of consistency when considering all of the energy for
energy optimization, on-site renewables and green power - there are
projects out there that might earn fewer EAC1 points under v2.2 than
under 2.1.  The percentage savings were changed between the versions so
it's hard to say if it is more or less likely to earn a certain amount
of EAC1 points - I would be interested to see a summary if the data is
available about EAC1 points under v2.1 compared to v2.2.  Probably about
the same?
 
For a high load density building like yours - definitely going to be
harder.  The only suggestion as far as EAC1 points that I could offer
would that if your design has receptacle load at 6 W/ft2 there is
probably a significant diversity in that load, maybe it won't turn out
as badly as you fear.
 
In regard to ventilation, you are going to use the outside air
requirements from the proposed design and apply that outside air
quantity to both models.  There isn't a "baseline ventilation rate" -
use equal CFM of OA for both models.  Also, OA may be determined from
local building codes rather than ASHRAE - that would also apply equally
to both models.
 
The one exception would be that Demand Control Ventilation could
potentially be used in the proposed model to reduce OA if DCV isn't
required prescriptively, and if your minimum OA from code is less than
what is required by ASHRAE 62.

Hope this helps!
 
David
 
 

________________________________

	From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of
Varkie Thomas
	Sent: Monday, March 05, 2007 9:14 AM
	To: BLDG-SIM at gard.com
	Subject: [BLDG-SIM] Process Loads and LEED
	
	

	LEED-NC Version 2.2 page 173 "Optimize Energy Performance"
states "Demonstrate a percentage improvement in the proposed building
performance -- " and  "For the purpose of this analysis, process energy
is considered to include, but is not limited to, office and general
miscellaneous equipment, computers, elevators & escalators, kitchen
cooking & refrigeration, laundry washing & drying --- "

	On page 174 "For EA Credit 1, process loads shall be identical
for both the baseline building performance and the proposed building
performance"

	Assuming the same space process load is used in the baseline and
proposed, then a building with a receptacle load density of say 1.0 w/sf
will produce a much greater percent savings compared to the same
building with a receptacle load density of say 6 w/sf.

	Page 173 "must comply with the mandatory provisions (Sections
--- ) in Standard 90.1-2004 (without amendments)"  There is no mention
of Standards 62 for ventilation & occupancy density or Standard 55 for
indoor comfort conditions.  Does this mean that the baseline can be
based on the proposed ventilation, occupancy density and indoor comfort
conditions?  According to Standard 62-2004 the occupancy density for
general office space is 200 sf/P (from 142 sf/P in 62-2001 and I think
100 sf/P earlier).  This produces a low percent system outdoor air and
energy conservation measures such as "occupancy based ventilation" and
"outdoor air to relief air heat recovery" have little effect.  Std
62-2004 (also Std 90.1-2004 for lighting) provides design criteria for a
limited number of space types such as a prison cell (improved from 50
sf/P & 20 cfm/P in 62-2001 to 40 sf/P & 10 cfm/P in 62-2004) .  This
makes it difficult to determine baselin e conditions using Std 62.

	I am looking at a financial institution building with high
occupancy and receptacle load densities.

	
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