[Equest-users] Some discuss about the Calculation Method of the software

[Sami, Vikram]

1.       Absolutely from the 1st situation, we can see that the software can't  judge if the two space are adjacent from the coordinate, is that right? Further , how should the software judge if two spaces adjacent? The software judges adjacent spaces by the surface that separates them. In interior spaces you have to specify an adjacent space that it shares the space with.

2.       If there is a hole on the wall, I don't think the software should deal with it as natural ventilation, so , how should the software to deal with it?

3.        If some wall been deleted as 3rd situation, the software still can be run, so I think there should be some default boundary conditions, and which should be the default boundary condition?


The software doesn't (as far as I know) calculate holes. It will calculate heat transfer through a surface. In terms of boundary - it calculates heat transfer to a space from exterior conditions through an exterior wall, and from adjacent spaces through interior walls. The absence of a surface (I think) makes that area adiabatic - no heat transfer, mass, or any exchanges. It also means there is no daylight coming into the space from that wall. As far as natural ventilation goes - I think the way to model that is as an infiltration with a schedule.



Hope this helps


Vikram Sami, LEED AP BD+C
Sustainable Design Analyst
1315 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jiao, Joey
Sent: Sunday, January 29, 2012 10:04 PM
To: Equest-users at lists.onebuilding.org
Subject: [Equest-users] Some discuss about the Calculation Method of the software

Hi all:
Below are some situations always puzzle me:

1.       If you modify the Floor's Z-axis coordinate like this , you will find the 2 floors has been separated, but the calculation result didn't show any different.
[cid:image001.jpg at 01CCDF2F.DB234340]                [cid:image002.jpg at 01CCDF2F.DB234340]                 [cid:image003.jpg at 01CCDF2F.DB234340]

2.       As above, you can also move some wall like this, there is still no different.
[cid:image004.jpg at 01CCDF2F.DB234340]              [cid:image005.jpg at 01CCDF2F.DB234340]                 [cid:image006.jpg at 01CCDF2F.DB234340]

3.       But , if you directly delete this wall, the result show different.
[cid:image007.jpg at 01CCDF2F.DB234340]               [cid:image008.jpg at 01CCDF2F.DB234340]
[cid:image009.jpg at 01CCDF2F.DB234340]                [cid:image010.jpg at 01CCDF2F.DB234340]

The questions are :

1.       Absolutely from the 1st situation, we can see that the software can't  judge if the two space are adjacent from the coordinate, is that right? Further , how should the software judge if two spaces adjacent?

2.       If there is a hole on the wall, I don't think the software should deal with it as natural ventilation, so , how should the software to deal with it?

3.       If some wall been deleted as 3rd situation, the software still can be run, so I think there should be some default boundary conditions, and which should be the default boundary condition?

I have used this software half of one year,  but I can't sure if my calculation result is right, I think I need a higher level to understand this software.
Any suggestions would be appreciated.
I have learn a lot from you guys ,Thank you.

Joey
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Joey Jiao
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