[Equest-users] External Adiabatic
Nick Caton
ncaton at smithboucher.com
Wed Apr 27 07:53:54 PDT 2011
Arpan, Mark and others:
In detailed mode, there are many approaches that vary from fast to quick, with slightly different end-results. Deepika’s suggestion of forcing low u-value is very clever and something I’ll add to my toolbox!
The absolute simplest/easiest way to eliminate heat transfer across a surface in detailed mode is to delete it. Just let there be a “hole” in your 3D building =)! The only thing you’re losing with that approach (besides aesthetics?) is that an adiabatic surface has mass which will retain heat, whereas a deleted surface has no mass… here’s a quick summary of the various surface/partition types for reference, copied from an earlier post:
- Deleted/No surface - No heat transfer, no mass [Total disconnect]
- Adiabatic – No heat transfer, Yes mass
- Standard – Yes heat transfer, Yes mass (frame/mass partitions)
- Air – Yes heat transfer, No mass
- Internal – No heat transfer, Yes mass (another means of specifying thermal mass in a space – I haven’t used this myself)
If you really want an adiabatic surface (with mass), then you can make an adiabatic surface from an external surface following the pictorial guide I wrote up a while back (attached). This will achieve the same thing the wizards do automatically, with additional flexibilities.
You both may be on top of this, but it bears repeating every so often for everyone’s benefit: This and similar guides/discussions are currently available in the mailing list archives. Every user of eQuest should have the following bookmarked/favorite in their browser of choice!
http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/ <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/>
http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/ <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/>
~Nick
NICK CATON, E.I.T.
PROJECT ENGINEER
Smith & Boucher Engineers
25501 west valley parkway
olathe ks 66061
direct 913 344.0036
fax 913 345.0617
www.smithboucher.com
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Deepika
Sent: Wednesday, April 27, 2011 9:13 AM
To: Arpan Bakshi
Cc: equest-users
Subject: Re: [Equest-users] External Adiabatic
I think the u value can be changed to 0.001 to male the wall with almost zero heat transfer when in detailed mode. I tried doing that n it worked.
On Apr 27, 2011, at 7:06 AM, Arpan Bakshi <arpanbakshi at gmail.com> wrote:
Yes, the problem here is I am deep into detailed mode. Looks like we have to crack open the text edit again.
Thanks
Arpan
On Apr 27, 2011, at 9:55 AM, "Chris Swanson" <cswanson at rdfa.com> wrote:
See below. Nick gives a good explanation when I posed the same question a couple weeks ago.
Chris Swanson, EI
Mechanical Design Engineer
Roger D. Fields & Associates
(614) 451-2248
-------------------------------------------------------------------------------------------------------------------
“A suggestion for you both:
Right click any side of a shell during DD wizards at the zone definition screen (after any custom footprint/zoning patterns) to make that wall section “entirely adiabatic.” This sidesteps making any extra shells/systems and avoids having to back any figures out later. Screengrab following illustrates where I’m talking about – results in the background.
You can accomplish the same net effect in detailed mode in various ways, but I think this is probably the easiest/fastest approach if you know from the start you want to model only part of a building with exterior exposures.
<image001.png>
Best of luck!
~Nick
<image002.jpg>
NICK CATON, E.I.T.
PROJECT ENGINEER
Smith & Boucher Engineers
25501 west valley parkway
olathe ks 66061
direct 913 344.0036
fax 913 345.0617
www.smithboucher.com
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bruce Easterbrook
Sent: Wednesday, April 06, 2011 9:58 AM
To: Chris Swanson
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] How to model part of a building?
You have the right idea. Depending on the building of course, but I try to lump the part you aren't concerned about onto one AHU, and default everything in that portion. You are only concerned about the intersecting wall and it's condition. Add your other AHU's and zoning for the portion you want to work on. With the one extra AHU is makes it relatively easy to back out its numbers from the building analysis and you are left with what you want.
Bruce Easterbrook P.Eng.
Abode Engineering
On 06/04/2011 10:15 AM, Chris Swanson wrote:
Hello all,
I’m looking for recommendations of how to model just one section of a building in eQUEST. Three sides are exterior walls, while the fourth is connected to the rest of the building, and therefore next to a conditioned space. Would the best method be to just use two separate shells (1 – the building “wing” I’m analyzing, 2 – the rest of the building), although I’m only concerned with one of them? Is there a better way to do this? I’m hoping someone can point me in the right direction.
Thanks,
Chris Swanson, EI
Mechanical Design Engineer
Roger D. Fields & Associates
Columbus, Ohio 43220-2777
E-mail: cswanson at rdfa.com”
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-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Arpan Bakshi
Sent: Wednesday, April 27, 2011 9:48 AM
To: equest-users
Subject: [Equest-users] External Adiabatic
I can't find this thread I remember seeing about turning an exterior surface adiabatic where new construction meets existing building, ideas?
Arpan Bakshi, LEED AP BD+C
YRG sustainability
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