[Equest-users] Underfloor Patchwork

[Lars Fetzek]

Vikram,
 
    There have been some thoughtgul answers regarding U-values unique to
zones.  As I recall from ASHRAE practices, slab heat transfer is related
more closely to some "F" factor (relating to the perimeter) than to a
U-factor.
    Look at your dark blue cross pattern in the left foreground.  This seems
to correspond to a zone (a hallway?), but not to proximity or distance to
the edge-of-slab.  Therefore, I am guessing (and this is only a guess) that
eQuest is not trying to establish different U-values for these different
color regions, but that eQuest is merely assigning a floor segment to each
zone for calculation purposes.  In other words, this does not seem
consistent with giving emphasis to the slab's perimeter for heat-transfer
calculations.
    However, please tell me this:  If my guess is correct, should I have
been assigning external walls and roofs to each individual zone's external
surfaces rather than to a floor's external surfaces?
 
Lars Fetzek, EI
Phoenix Engineering Group
Tampa, Florida

  _____  

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Vikram Sami
Sent: Tuesday, August 11, 2009 2:38 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Underfloor Patchwork



This is a question that I've wondered about for a while. When you come out
of the wizard, an UF material is created for each zone(like below), with
different properties for each zone - with an amazing variation in properties
across the board. Does anyone know why? Is it reasonable to assign one
material to all of them (assuming they are the same construction and sitting
on the same soil), and if so, how do I know which material to pick out of
the 20+ construction assemblies created? 

 



 

 

 

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

LORD, AECK & SARGENT ARCHITECTURE
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