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Old 05-09-2006   #24 (permalink)
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Turtle
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Talking Re: Solar Parabolic Trough Charcoal Oven

Quote:
Originally Posted by Cedars
*wonders if the military is repositioning satellites to answer the question "what the hell is that?!"
I have a squadron of F-15's just South of me at PDX.


Quote:
Originally Posted by Racoon
That looks AWESOME DUDE!
I burnt my Cornea just viewing the attachment!
Good job Turtle-san..
a pat on the back, and more questions too....
Thanks Rac. Here's some answers.
The oven is hovering just below 200° F in full Sun & an ambient air temperature of 64° F. That is less than half of what we need. If I resilver the reflector with foil, I expect a small increase in temp. On a warmer day, I expect a small increase in temp. However, I do not think this reflector is big enough to reach our target 450° to 500° F.
A feature of the large solar troughs is the inclusion of Dewar tubes around the receivers to retard heat loss to the atmosphere. I am not getting a Dewar tube.
http://en.wikipedia.org/wiki/Dewar_tube
http://en.wikipedia.org/wiki/Dewar_flask
So, I think a trough in the 12 foot range (mine is 42") with the same uninsulated stove-pipe tube is sufficient to get to 500° F. While I consider that task, I have in mind to jam some yard debri in the tube & bake the hell out of it just to see how it changes.


----------------
semantics is not always just pedantic quibbling. ~ douglas r. hofstadter
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