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automatic release for excess heat in hot air panel

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Posted by perri_mike on September 20, 2006, 10:45 pm
 
I'm building a 12'x12 hot air panel this weekend based on Bill
Kreamer's design.  However, I'm stuck on how best to vent the panel in
case the power goes out and/or the fan fails.  On the forum, I've seen
reference to automatic foundation vents but they open at too low a
temperature.    Can they be retrofitted with different bimetallic
springs to open at say 180 degrees?  Bill's design references a vent
product that does the job but I haven't heard back from him.
Suggestions much appreciated.

Mike


Posted by Solar Flare on September 21, 2006, 12:45 am
 
Put them in the shade



Posted by perri_mike on September 21, 2006, 2:33 am
 It's a single homemade panel mounted to the side of the house.  Moving
it is not an option, plus the power can go out when I'm not around.

Solar Flare wrote:


Posted by SJC on September 21, 2006, 3:19 am
 I would think that just convection would move some air if the fans stop.
How hot could they get? Hot enough to melt something in the collector?

It's a single homemade panel mounted to the side of the house.  Moving
it is not an option, plus the power can go out when I'm not around.

Solar Flare wrote:


Posted by Robert Scott on September 21, 2006, 11:53 am
 

I agree.  If the collector is single-glazed, no protection is generally needed
because the normal losses are enough to keep the materials from damage.  A
double-glazed collector is another matter.  In that case just opening up a
channel for some natural theromosiphoning convention would be enough to keep the
collector from destroying itself.  Fans would not be necessary.


Robert Scott
Ypsilanti, Michigan

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