LEED for Interiors 3.0 EA 1.3 Energy model

5 posts / 0 new
Last post

Hi All!

I am doing energy model for EA 1.3 LEED 3.0 CI. My project takes 2 floors of
8 story building. I am trying to understand this credit, and I probably
think to hard and make everything to difficult.

The building is LEED certified already. Energy model was done by AHSRAE
90.1-2004. All floors have WSHP units that cool and heat spaces. Fresh air
is delivered by energy recovery rooftop unit. System includes 2 boilers,
pumps, and 2 closed circuit evaporative cooling towers.
I'm working in Trace program.
So my project has common ERU, heating and cooling plants with other floors.
The underfloor air distribution system and two heat pumps were added to in
my project + occupancy sensors.
Could you explain me please, how do I need to build my model.
1. Do I have to model the whole building or take the area within my project
?
2. I will have 3 alternatives as it is required in LEED CI EA1.3 . First is
my actual design, third is a model by AHSRAE 90.1 2007. I can't understand
what should include the second alternative ( baseline case step 6 ) in this
case if I take area only within my project. Does it have to be my actual
design before renovation?

Please, help me to understand and to get clear thoughts.

Thank you

--
With best wishes,
Genia

EvGenia
Kroz's picture
Offline
Joined: 2010-10-05
Reputation: 0

Genia,

Use your proposed building model. Simply open it up and save it using
another file name and make your changes. Should be doable in TRACE although
I haven't used it for a number of years so not entirely sure.

Carol

cmg750's picture
Offline
Joined: 2010-10-05
Reputation: 0

Genia,
To your first question, 90.1-2007 Chapter 11 Table 11.3.1 No 2.b. requires the model to include all of the spaces served by the mechanical system(s) serving the project spaces. We had a LEED reviewer require remodeling of an energy performance prerequisite model to address this, even though the outcome was obvious. And that was even before they overhauled their review process. I strongly believe that they will require your energy model for LEED 2009 for CI (EAp2 or EAc1.3) include of all of the spaces that are served by the air, water, and refrigerant systems that serve your project spaces. A huge part of mechanical system performance is part load performance and the rationale is that you cannot adequately evaluate that without modeling the whole system with the correct capacities and load profiles.

I don't understand your 2nd question.

Good luck,

Paul Riemer

Paul Riemer's picture
Offline
Joined: 2011-09-30
Reputation: 0

Genia,
You'll have two models - and you will need to model everything that the
system serving your two floors is serving - which is probably the rest of
the building. If your two floors are served by an AHU, and that AHU serves
everything - you must model everything.

The first model will be your baseline model - LEED CI allows you to either
use your 90.1 ASHRAE baseline building as this baseline, OR if you are in a
really old really inefficient building, it allows you to model the existing
building as your baseline (before your retrofits / modifications). The
purpose of this is if you choose your location for your office well, say
you go into a LEED platinum building, your existing building is amazing -
and thus LEED CI allows you to use the 90.1 baseline for your base model.

The second model will be your proposed building. Try to get the energy
conservation measures incorporated very early in the design. LEED CI can
be difficult because your hands are often tied because of existing building
parameters...

My second LEED project (Our URS office in Southfield Michigan) was LEED CI,
it achieved Silver last year so I know CI modeling pretty well.. email me
if you have any questions.

-Shariq

Shariq_Ali at URSCorp.com's picture
Joined: 2011-10-01
Reputation: 200

An HTML attachment was scrubbed...
URL:

Nearedge's picture
Offline
Joined: 2011-09-30
Reputation: 0