Posted by nicksanspam on September 21, 2006, 1:15 pm
With no convection, 0.9x250Btu/h-ft^2 = (T-50)1ft^2/R1 makes T = 275 F,
which is probably hot enough to melt Bill's polyester furnace filters.
Leslie-Locke's AF1-B automatic foundation vent ($2 at Home Depot) has
a spiral spring that can be rotated to change the opening temp.
Posted by perri_mike on September 21, 2006, 4:29 pm
It doesn't seem that the Leslie Locke AF1-B automatic foundation vent
is available anymore. It doesn't show up on Home Depot's website nor
does Leslie Locke seem to think they have it (according to phone calls
made by my local Tru-Value store). A Google search only brings up the
many references to it in the solar forums.
Do you think that most automatic foundation vents are pretty similar
and would allow me to rotate the spring to adjust the temperature
setting? I'll have to order one since I'm in a small town and a long
way from Home Depot type stores.
Posted by nicksanspam on September 21, 2006, 5:59 pm
Hmmm. There are other brands. Witten looks promising. Leslie-Locke's
was nice because you could even remove the spring and install it backwards
so the louvers would close on temperature rise, which would allow its use
as a crude thermostat.
I would guess so.
Posted by perri_mike on September 21, 2006, 7:04 pm
Thanks Nick. And to answer Gary's questions, it is a vertical panel
and I considered metal screening but the cost seemed a lot higher than
felt (I paid @$5 for 12'x12' panel from Joanne Fabrics).
I'll let everyone know my experience when I get it up and running.
Posted by Gary on September 21, 2006, 2:23 pm
It sounds like the panels are vertical? That helps a lot in the summer.
My single glazed shop air collector gets up to about 190F at stagnation on a
warm day. For summer overheating, a small overhang would also help -- even a
foot of overhang will shade quite a bit of the collector in mid-summer.
Have you thought about using a metal or metal screen absorber instead of the
felt? This would allow your collector run hotter with less possibility of
"Build It Yourself" Solar Projects
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