[Equest-users] Model simplification & LEED

[Vikram Sami]

Lars - zones should suffice. Appendix G lays out some guidelines for
this:

 

7. Thermal Blocks - HVAC Zones Designed

Where HVAC zones are defined on HVAC design drawings, each

HVAC zone shall be modeled as a separate thermal block.

Exception: Different HVAC zones may be combined to create a

single thermal block or identical thermal blocks to which multipliers

are applied, provided that all of the following conditions are

met:

(a) The space use classification is the same throughout the thermal

block.

(b) All HVAC zones in the thermal block that are adjacent to glazed

exterior walls face the same orientation or their orientations vary by

less than 45 degrees.

(c) All of the zones are served by the same HVAC system or by the

same kind of HVAC system.

 

If you want to account for some of the mass from the interior walls, you
can define the interior mass in the "contents" tab of the space
properties. 

Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE



 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Lars
Fetzek
Sent: Friday, July 24, 2009 10:53 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Model simplification & LEED

 

Fellow eQuesters,

 

    I am modeling an office building with a few HVAC zones, each of
which is supplied through a VTU.  Within each zone are many walls which,
collectively, could require the rest of my life to model.  To model
these walls seems a bit more detail than physics justifies, since they
generally separate rooms within zones rather than the zones, themselves,
and because all of the building is intended to maintain the typical 75
degrees F temperature and the air will, of course, circulate among
nearby rooms.

    Can anyone tell me whether choosing to model only those walls that
are at the borders of HVAC zones will cause an objection by the
LEED/USGBC people who will be reviewing the building (and my model) for
LEED certification?

    Thanks.

 

Lars Fetzek

Phoenix Engineering Group

Tampa, Florida

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