[Equest-users] LEED Baseline secondary HVAC system

[Nathan Miller]

Based on the exact wording of the Table G3.1.1A, I would say you are
System 7, which is for "Nonresidential and more than 5 floors OR >150,000
SF. However, we all can see that it is probably a pretty ridiculous
baseline system for a corridor ventilation unit.

 

On multifamily projects I've worked on, I've used system 5 in the past
(even though the floor number requirement would trigger system 7) and
never been called on it. That being said, usually that was on projects
with ~7 stories, so I was much closer to the threshold, so maybe the LEED
reviewer just let it slide. Even System 5 is a bit peculiar for a corridor
unit. At least in my climate they end up usually being packaged rooftop,
constant volume units. 

 

Nathan Miller, PE, LEED AP BD+C

Mechanical Engineer/Senior Energy Analyst

 

D 206-788-4577 | O 206-285-7100

 <http://www.rushingco.com/> www.rushingco.com

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ritwik
Kakati
Sent: Thursday, August 16, 2012 2:09 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] LEED Baseline secondary HVAC system

 

I am modeling a residential building under LEED 2009. With reference to
ASHRAE 90.1-2007, Exception 'a' in section G3.1.1 which states that we
should use additional system types for nonpredominant conditions if they
apply to more than 20,000 SF of conditioned space - I am confused which
system type I should use for my corridors and other non-residential
conditioned spaces, which are about  21,000 SF total, spread across 20
floors. Do I use System 7, because my non-residential spaces are located
on more than 5 floors, or use System 3 or 5 because the area is less than
25,000 SF?

 

Thanks,

 

Ritwik Kakati, LEED Green Associate

Design Engineer

DAGHER ENGINEERING, PLLC

29 Broadway, New York, NY 10006

T. 212.480.2591 x140

F. 212.480.2654

rkakati at dagherengineering.com

www.dagherengineering.com

 

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