technomaNge wrote:
On 10/31/2011 06:57 PM, Winston wrote:

(...)

I want to recirculate the air to avoid thermal
stratification anyway. It'd be nifty to have
that little fan serve another purpose as well.


I'm visualizing an old computer fan blowing
into a vertical PVC tube. Even a 40 mm fan
will move more air than you suspect.

OK, that is spooky.

I'm using a 12 V 'blower' style computer fan and
a 2" diameter ABS tube. At least for starters.

The plan is to vacuum the stratified air out
of the top of the leaf enclosure and distribute
it near the bottom so it warms the bottom leaves
during the winter. That turbulence should
also vent O2 away and make more CO2 available
to the leaves, I guess.

I suppose I will have to vent the top of the
nutrient column to allow O2 in and CO2 to exit
out of the nutrient tank overflow tube on the
bottom, too. It'll be interesting to see how
I do that while minimizing evaporation and
without allowing any light into the nutrient
column.

Fun Stuff!

--Winston