[Equest-users] Conduction to adjacent space

[John Aulbach]

Lars:

This is VERY hard for me to visualize.

But realize you can only define walls between spaces in ONE space, not both.

It would be helpful to see the .PD2 and the .INP files.

John Aulbach

--- On Wed, 9/2/09, Lars Fetzek <lfetzek at phoenixeng.us> wrote:

From: Lars Fetzek <lfetzek at phoenixeng.us>
Subject: [Equest-users] Conduction to adjacent space
To: equest-users at lists.onebuilding.org
Date: Wednesday, September 2, 2009, 12:44 PM



 
eQuesters,
 
    
The geometry of my project is pretty complicated (and architecturally 
ever-changing), so I'm looking for an easy-way-out regarding a small wall 
bordering two spaces (thermal zones), one of which is much larger than the 
other.  (Unfortunately, the two zones in question have different 
temperatures, so an adiabatic wall is not a good 
simplification.)
    
Suppose that I do the following:  Cover the entire border of the large 
space with an adiabatic wall, which I will define as "external", but 
give the smallest U-value that eQuest will accept.  (The portions 
of this wall not bordering the small space actually border other spaces that are 
at the same temperature as the large space, thereby justifying this adiabatic 
assumption.)  Then, define an internal wall in the smaller space that is 
"next-to" the larger space and has an appropriate realistic 
construction.
    
My questions are these:
1.    
The resulting total wall area of the larger space exceeds that of physical 
reality.  However, the amount of heat-conducting area is correct.  
Does this somehow mess up eQuest's calculations?
2.    
Is this going to be a problem for the LEED evaluation 
people?
3.    
I admit that this shortcut causes the effect of the specific heat of the 
artificially adiabatic walls to be ignored.  Realistically, does this 
matter for an office building with metal studs and gypsum drywall - especially 
when my model ignores the specific heats of the various unknown office 
furniture, etc.?
 
    
Thank you in advance for any thoughts.
    
Thanks also to the several of you who have helped me with your replies to 
previous questions.  (It is appreciated!)
 
Lars Fetzek, 
EI
Phoenix Engineering 
Group
Tampa, 
Florida
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