[Equest-users] window addition to adiabatic wall

[Nick Caton]

Vamshi,

Adiabatic walls are interior surfaces which will not permit heat transfer, by definition.

If you intend to add a window to an exterior wall, you should not be using an interior surface.

If you intend to model a window in an interior partition, using an adiabatic surface may well hinder your efforts - better to switch an option which models heat transfer.

If your goal is to model the solar gains to a core space through a perimeter sunspace via interior windows, you should review the attached discussion from bldg-sim.  I understand this is possible with some care - but it requires careful review of the associated help resources to get all your ducks in a row.  One "gotcha" is that you are required to use the "by glass code" definition approach for the associated exterior windows.

If your goal is to simply model the conductive heat transfer (not solar transfers) of those windows, you may consider defining an interior surface by construction type (not adiabatic), and weight the U-values and areas of the windows & partition construction together for a net U-value -I did this extensively in the past, before realizing windows can be defined for interior surfaces.

Food for thought: I would not anticipate a correct model to exhibit a great change in energy consumptions if the two interior spaces in question are both conditioned to similar/same setpoints.  If the difference in temperatures are not great, changes in the partition conductive properties will not have a great effect as heat will not be inclined to move much to begin with.

~Nick

[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
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 vamshi ranga
Sent: Monday, October 15, 2012 9:10 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] window addition to adiabatic wall

Hi,

eQUEST has created "Adiabatic Interior Wall" by default, if I add a windows to those areas, still there is no change in energy consumption. My doubts is,

 - Is it not possible to change adiabatic wall properties even if we add window?

Thanks
Vamshi.
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