[Equest-users] Typical assumptions for Mechanical Room exhaust

[Anthony Hardman]

The exhaust fans sound like they may be for boiler combustion air?  If so,
add the exhaust fan power as an electric EIR to the boiler.  Then you don't
have to worry about infiltration loads blowing up your unmet hours.

 

Anthony Hardman, PE, LEED AP BD&C

Building Performance Analyst

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From: James Hansen [mailto:JHANSEN at ghtltd.com] 
Sent: Tuesday, December 20, 2011 9:40 AM
To: Ramana Koti; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Typical assumptions for Mechanical Room exhaust

 

I always set up a separate heating and cooling schedule for mechanical rooms
in garages (as an example).  Cooling setpoint is 120 degrees for all hours,
heating setpoint is 45 degrees for all hours.  Set it up as a PSZ system,
with EIR meeting minimum requirements of 90.1 even though it will never be
in cooling mode.

 

GHT Limited
James Hansen, P.E., LEED AP
Senior Associate
1010 N. Glebe Road, Suite 200
Arlington, VA  22201-4749
703-243-1200 (office)

703-338-5754 (cell)
703-276-1376 (fax)

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

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ramana Koti
Sent: Tuesday, December 20, 2011 11:30 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Typical assumptions for Mechanical Room exhausts

 

Dear All,

 

Specifically for energy models for LEED EAc1, what are typical assumptions
for operation of mechanical room exhaust? The mechanical rooms in a project
I'm dealing with have freeze protection heating only but as per LEED spaces
that are heating or cooling only have to be modeled as both heating and
cooling. For example, one of the mechanical rooms has 8000 CFM of exhaust
and zero Outside Air CFM. How does one model for accurate representation yet
keep the loads from ballooning disproportionately in such a situation?

 

Thanks,

Ramana Koti.

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