[Greenbuilding] re: Exhaust Only Passive Inlet Ventilation

[Robert Tom]

On Mon, 03 Dec 2007 21:56:15 -0500, Sacie Lambertson  
<sacie.lambertson at gmail.com> wrote:

> if there are no vents in the upper or lower spaces  of
> this varied level house in which all spaces are open to the rest of
> the house, then what is the effect of exhaust only passive inlet
> ventilation?  ie can it work?


Not sure what you mean by "no vents" (ie no fresh air inlets ? no exhaust  
vents ? ) but I'd say "No".

The "problem" implied by the conditions mentioned in the first post that  
led to this thread (ie EOPIVS will not work in multi-storey, will not work  
in all but the mildest locales in Canada etc.) is that of overcoming the  
stack effect.

In a non-compartmentalised multi-storey SFH, any fresh air entering  
through the passive inlets would tend to head up to the ceiling of the  
uppermost storey, effectively short-circuiting the ventilation airstream  
where it was supposed to be available for the house occupants.

The greater the temperature difference between I/S and O/S or the greater  
the inter-storey altitude, the faster the short-circuiting.

I didn't look at the link that someone provided for the  
no-longer-available window HRVs but I'm guessing that the short-circuiting  
problem would be inherent with those as well.

Perhaps someone dealt with this issue with the laminar flow windows that  
made an appearance some years ago but I suspect "not".

-- 
=== * ===
Rob Tom
Kanata, Ontario, Canada
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