[Bldg-sim] Spaces fully Bounded?

[John Aulbach]

Joshua - I will take a stab at this. When you create your shell and then your spaces (zones), you may not have the space vertices correctly line up with your shell. Thus, the "exterior"wall does not know it is an exteroir wall, as it does reach the "outside."

Also you may have two adjacent space coordinates also not meshing correctly, thus you could have Space A's East interior wall actually being inside Space B's West region (Assuming Space A is on your left and Space B is on your right, and the Building North is actual north).

It can get fun trying to getting these spaces touching at the same coordinates, especailly if there are several votices per space.

Also, interior walls adjacent to another space are counted only once, and it could be in either space. This has been true in DOE-2 since it's inception.

Good luck.




________________________________
From: "Talbert, Joshua" <jtalbert at hallam-ics.com>
To: "bldg-sim at lists.onebuilding.org" <bldg-sim at lists.onebuilding.org>
Sent: Sun, April 11, 2010 3:40:25 PM
Subject: [Bldg-sim] Spaces fully Bounded?


Hello,
 
When I begin an eQuest model in the Wizard entry mode and use a CAD file to "trace" my spaces I find that when I look at them in the detailed edit that they are not all bounded by walls.  Sometimes a core space will not have any walls or just one or two, but may not be fully bounded.  I find I end up going through and "bounding" all my spaces, to makes sure they have the correct layout of "interior" walls, "adiabatic" walls, "air" walls etc.  Could someone explain why some spaces are created with interior walls in the wizard and others are not?  As a follow up how are interior walls counted for in terms of thermal mass and by fully bounding spaces are internal walls double counted with regards to thermal mass?  I often use a "quick wall" or rather U-value input for light weight interior construction, but when I have a building with a lot of CMU walls internally I want to make sure I appropriately address the thermal storage properties.
 
Thanks for the help.
Josh
 
Joshua W. Talbert P.E., LEED-AP
Mechanical Engineer
Hallam///ICS
38 Eastwood Dr. Suite 200
P: (802) 658-4891
F: (802) 658-1457
 
S. Burlington, VT 05403
 
________________________________

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