Re: [EnergyPlus_Support] Re: Infiltration affected by gaps between walls?

On Wed, Jul 25, 2012 at 9:02 AM, Ooi <ooi_kb3@xxxxxxxxxxx> wrote:

A mistake in entering of more than three vertices would most probably mean that the surface is not planar. You would most probably get a severe error in the .err file. EnergyPlus requires all surfaces to be planar as it's heat transfer algorithms, except the 3-D ones for Slab and Basement preprocessor, are one dimensional.

The answer to your question at the end would be a NO. Sorry. ooi

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Ritwik Raj <ritwikraj@...> wrote:
>
> Thank you. As of now, I'm not using the AFN. I was just wondering about a
> situation in which there was a gap left between planes due to a mistake in
> entering of vertices. Would such a gap be recognized, and if yes, would
> there be air flow through it automatically?
>
> Thanks very much.
>
>
>
> On Fri, Jul 20, 2012 at 10:37 AM, Jean marais <jeannieboef@...> wrote:
>
> > **

> >
> >
> > Your concern depends on what you are trying to achieve. Using the "simple"
> > infiltration objects, you could define leakage per outdoor bounding walls
> > or per all outdoor bounding areas. Using the more complex AFN the user must
> > manually define all flow paths. There is no automation to calculate the
> > perimeter crack length of windows, doors, walls, etc. DesignBuilder can
> > partly automate the AFN creation and can assign a flow path for each
> > sub-surface element (door/window), as well as some of the controls and
> > managers used in AFNetworks.
> >
> > When simulating the air flows due to the opening of doors and windows,
> > you'll need to make some sacrifices, assumptions, simplifications.
> >
> > But if you're only concerned with energy usage due to leakage
> > infiltration, in modern buildings that are mechanically ventilated, then
> > the fraction of energy usage attributed to leakage infiltration is most
> > likely very low, therefore accuracy is of lesser importance here (in my
> > opinion).
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "r2baar" <ritwikraj@> wrote:
> > >
> > > Hi Everyone,
> > >
> > > I am a new user, and I am concerned about infiltration changes due to
> > any gaps (even if they are very small) between walls or between a roof and
> > a wall. Is the infiltration only dependent on the effective leakage area,
> > or does it get affected by other "areas" that allow leakage?
> > >
> > > Thanks very much.
> > >
> > > Ritwik
> > >
> >
> >
> >
>
>
>
> --
> Ritwik Raj
> Sefaira, Inc.
> New York, NY 10003
>