[Bldg-sim] Question: Table G3.1

[Jesse Eisenhart]

Most existing facilities I've worked with have included an envelope upgrade.
In that light App G allows for us to use the existing envelope for the
baseline.  Not sure if this will be your issue, but I find a lot of the
existing envelopes that I've dealt with are simply CMU.  If the envelope is
held consistent for both the proposed and baseline case, the efficiency of
the HVAC system should shine a little brighter.

 

 

Jesse Eisenhart

Energy Services

Project Manager

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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sami, Vikram
Sent: Monday, December 19, 2011 10:59 AM
To: bldg-sim at lists.onebuilding.org
Cc: Glazer, Breeze
Subject: [Bldg-sim] Question: Table G3.1

 

Here's a brain puzzler for the list. 

 

I'm assisting a team designing an addition (auditorium + rehearsal space) to
an existing high school in Connecticut. As a public project receiving state
funding, CT's High Performance Building Standard applies which requires a
21% energy cost savings (LEED for Schools Silver is also targeted for the
new addition only). 

 

The new space will have independent/new ventilation systems, but will most
likely utilize the boiler and potentially chillers of the existing school
building. 

 

Buried in ASHRAE modeling guidelines, we discovered (long after project
started and engineers "completed" the model) that  additions and alterations
that share HVAC systems with existing spaces, are required to include those
spaces in their energy model. The new space is designed for a 24% reduction
- but if the existing spaces (approx. 3x the sf of new space) are included
performance will fall way below the required threshold. 

 

We can't understand how other  LEED projects in similar situations ever meet
energy reduction requirements, has anyone dealt with this on a LEED project
and found ways to circumvent? Has anyone come across a similar condition,
and if so - how did you approach it? 

 

 

Many Thanks in advance - 

 

Vikram

 

Vikram Sami, LEED AP BD+C

Sustainable Design Analyst

1315 Peachtree St. NE, Atlanta, GA 30309

t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com
<http://www.perkinswill.com/> www.perkinswill.com

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