Re: Ping Larkin

On Wed, 28 Oct 2009 10:24:23 -0700, Charlie E. <edmondson@xxxxxxxx>
wrote:

On Wed, 28 Oct 2009 10:05:25 -0700, Joerg <invalid@xxxxxxxxxxxxxxx>
wrote:

Charlie E. wrote:
On Tue, 27 Oct 2009 16:16:21 -0700, Joerg <invalid@xxxxxxxxxxxxxxx>
wrote:

Jim Thompson wrote:
On Tue, 27 Oct 2009 11:16:29 -0700, Joerg <invalid@xxxxxxxxxxxxxxx>
wrote:

Charlie E. wrote:
On Mon, 26 Oct 2009 23:00:28 +0000, Martin Brown
<|||newspam|||@nezumi.demon.co.uk> wrote:

Joerg wrote:
ChrisQ wrote:
Joerg wrote:
On the news a few days ago: They had to close the "environmentally
compliant" new wing of a school because of H1N1. The old (real)
buildings exhibited little problems because you could open windows,
"hallways" were outdoors, etc. The newfangled building was
essentially a giant petri dish and so the kids there got sick. So
much for progress.
That is a weakness of a lot of the no external opening windows designs.
Sick building syndrome as the formaldehyde and other junk from the
furniture and carpets accumulates in a poorly ventilated space. There is
no excuse for not having fresh air heated by outgoing stale air though.
<snip>

My home here (three years new) has not only double pane windows, it
also has plastic sealing in all the exterior walls. In a 70 mph wind,
there are only a few places where I can feel a draft - one by a wall
outlet, and the other around my back door. The door flexes enough to
release the weather stripping!

But, my HVAC system also has a timer that causes it to go on with the
fan only at least every so often, and the system has an intake to the
outside for fresh air. ...
I've always wondered where to get those. It would need to be before the
filter or have its own filter. This whole concept of whole house fans is
so strange, they rely on venting out instead of in so all the dust and
pollen is sucked into the house. In Australia there are (IIRC) systems
that blow in instead, makes a lot more sense. Never seen that in the US.

[...]
What does it matter, push or suck? As long as the filter is on the
inlet side? I think, actually, suction is more efficient.

For a whole house fan you need to have a huge opening, meaning at least
one of the big glass sliders. If you don't then you'll have stuff flying
about. Unfortunately it ain't practical to have a 3ft*6ft filter tacked
to the screen door even if you managed to find one ;-)

I think this whole technology is rather stone-age. Same with swamp
coolers. All you can buy is those big and ugly boxes. Nobody makes a
flat one with a nice cartridge filter. Progress in that domain seems to
be as sluggish as it is with pellet stoves.

Well, I saw an evaporative assisted air conditioner unit, where it
sprays water on the coils, that would be especially usefull out here
in the desert.


I've seen that a few years ago. Finally it has sunk in how to make them
more efficient, progress in the HVAC biz is so sloooow.


But, evaporative coolers need to be pretty big. The concept is that
there is not too fast a flow through the mats to provide time for
evaporation to occur and give the necessary cooling. Surface area
means added throughput.


Sure. But the ones I check out all work the same way: HUGE squirrel cage
sucking air through a slowly revolving felt pad. Why can't there be a
slow but flat propeller running instead and the felt pad have a pump
that oozes on water from the top?

Hmmm...
All the units here are a box with three or more fixed pads, about 2"
thick, with a reservoir at the bottom, wtih a pump that feeds a tube
above the pads to wet them. Around here you need to clean it out from
the filtered sand and dirt about once a month, and replace the pads
every couple of years from the encrusted minerals.

Charlie

Mine was stainless steel, 6000CFM, pads on all four sides, down-draft,
recirculating pump plus a controlled bleed-off to minimize the calcium
build-up. I built my own stand and ductwork routing the air flow thru
an exterior wall, under a raised closet floor into the interior A/C
ductwork when a slide was pulled out ;-)

...Jim Thompson
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