[Greenbuilding] Greenbuilding Digest, Vol 67, Issue 10

[Alan Abrams]

Reuben-

can you take advantage of the coanda effect, in which a stream of air
enjoys scurrying along a flat surface? If so, yes, shorten duct runs
accordingly. And maybe reduce fan size, too, if you're reduced enough
static pressure.

https://en.wikipedia.org/wiki/Coand%C4%83_effect

-aa

Alan Abrams

*certified professional building designer, AIBDcertified passive house
consultant, PHIUS*
*certified passive house builder, PHIUS*
cell     202-437-8583
alan at abramsdesignbuild.com
HELICON WORKS *Architecture and Education*
<http://www.heliconworks.com/index2.html>

On Mon, Mar 28, 2016 at 4:00 PM, barbara deane-gillett <deaneg at hotmail.com>
wrote:

> go for it and harvest the ductwork savings
>
> Sent from my iPhone
>
> On Mar 28, 2016, at 2:01 PM,
> greenbuilding-request at lists.bioenergylists.org wrote:
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> >   1. forced air heating vent placement (Reuben Deumling)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Mon, 28 Mar 2016 10:55:47 -0700
> > From: Reuben Deumling <9watts at gmail.com>
> > To: Greenbuilding <greenbuilding at lists.bioenergylists.org>
> > Subject: [Greenbuilding] forced air heating vent placement
> > Message-ID:
> >    <CAE5fceB0kxKhTGAAqdOOWwTK26mXib8Jr3-gwXeJS7wwMJPY7g at mail.gmail.com>
> > Content-Type: text/plain; charset="utf-8"
> >
> > There seems to be a tradition of placing these all the way out at
> exterior
> > walls, and often under windows. Does this hark back to when windows were
> > the coldest surfaces and this would--in combination with a floor
> vent--make
> > for convective currents which could then be relied on to mix the warm air
> > better?
> > I'm in the process of adding four inches to the inside of the exterior
> > walls on a 140 year old farmhouse and blowing a ton of cellulose into
> those
> > deeper cavities. There will be exterior storm windows and the house
> overall
> > should end up pretty tight and cozy even without the furnace turned on. I
> > have to move some of these vents as they are too close to the existing
> > wall; my temptation is to shorten the ducts, not just by a few inches but
> > perhaps by a bunch. I'm curious for any thoughts or suggestions you might
> > have.
> >
> > Thanks very much.
> >
> > Reuben
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