[Bldg-sim] Mixed Mode Ventilation in eQUEST

[Dan Russell]

Mike - Like Robby, I have a mix-mode building and am trying to determine
how to document the savings for LEED-NC credit EA1.  The only CIR I can
find on the USGBC website that has to do with natural ventilation energy
savings is from 3/22/2007, is this the CIR you were referring to?  

The project team in that CIR was proposing to use EnergyPlus, which I
hear is a better natural ventilation simulation engine.  Has anyone out
there had success using eQuest (DOE2.2) for a LEED energy submittal
taking credit for natural ventilation?  I realize it would most likely
require some work using the Exceptional Calculation Method as per the
backup option proposed in the CIR I referenced, but I believe there
would have to be a simulation done at some point.   I'm just wondering
if I'm wasting my time to try and do this portion of the documentation
with eQuest (I hope not since my model is started in eQuest already and
I don't have any experience with EnergyPlus) or if eQuest has been
accepted as an adequate tool for natural ventilation simulation by the
USGBC.

 

I have a copy of the CIBSE publication you mentioned and am working my
way through it to provide the best documentation possible.  I am only
assuming at this point that an hourly simulation is required, but I
don't see any other way, even with the use of the equations found in
chapter 4 of the CIBSE book.

 

Any help or ideas are much appreciated.

 

Thank You,

 

 Dan Russell, EIT 

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Michael
Tillou
Sent: Wednesday, January 02, 2008 1:19 PM
To: 'Robby Oylear'; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Mixed Mode Ventilation in eQUEST

 

Robby,

 

If your project is seeking LEED certification and you want to claim
credit for the Natural Ventilation under EA-1, I reccomend that you get
the book "Natural ventilation in non-domestic buildings" published by
the CIBSE and the Carbon Trust.  USGBC requires a rigourous analysis of
your natural ventilation modeling results before granting any EA-1
credit and this reference will help you navigate that.  You should also
read the CIR regarding natural ventilation energy savings on the USGBC
website.

   

Mike

 

Michael Tillou, PE, LEED

Tillou Engineering, LLC

Williamstown, MA 01267

P: 413-458-9870 C: 413-652-1087

 

 

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Robby
Oylear
Sent: Wednesday, January 02, 2008 1:28 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Mixed Mode Ventilation in eQUEST

Hi all,

 

I'm working on an energy model for a project that is very interested in
incorporating a mixed mode ventilation scheme.  The mixed mode would
operate in an on/off red light green light method where the mechanical
cooling would shut down during hours when the outdoor air temperature
could meet the space cooling loads and the mechanical system would run
its relief fan in order to pull air into the space.  It would be up to
the occupants to open the operable windows.  

 

I've been through the basic options for natural ventilation in eQUEST
and it doesn't look like what's available in eQUEST is going to work for
the PIU system I have in the building right now. I'm thinking it will
have to involve some sort of schedule modification to turn off the
perimeter VAV box fans during hours when the loads could be met by the
natural ventilation.  I could make the schedule based on BIN calc
information for Seattle.  This would involve a lot of fine tuning though
and it would be questionable whether I could still keep the unmet load
hours under 300.  To simulate the operable windows modifications could
be made to the infiltration values at the perimeter spaces.

 

If anyone has had any success with mixed mode ventilation or has any
ideas towards this it would be much appreciated.

 

Robby Oylear

Project Engineer

direct: 206.788.4571

cell: 206.354.2721

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

 

 

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