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Bert

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Reply with quote  #11 
Added the pivot support. A carriage bolt through the back recessed. The thumb screw will be on the outside of the base piece not constructed yet.

IMG_20180110_083040105.jpg 

IMG_20180110_085056148.jpg 

The black paint is taking forever to dry.



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Bert K.
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dbc

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Reply with quote  #12 
Looks great; coming together quickly too.

I'm looking forward to seeing how the suspended cooking tray works out.  I guess you are planning to add reflectors too?  Mylar film for the reflective surface?
Bert

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Reply with quote  #13 
Yes I will be adding reflectors with Mylar. I may have to wait until my next SS check unless I find a cheap way to make them.

I have the Mylar on the way but I'm not sure what I will use to attach it to.  I would like it somewhat lightweight but strong enough.
Any ideas?

I will try to get a video posted of the  suspended cooking tray as I tilt the oven when I get that far.


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Bert K.
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sundug

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Reply with quote  #14 
Quote:
Originally Posted by Bert
I'll check out Solar Cookers International. Thanks!

I want the inside to be dark but I didn't want to paint it. Not sure if it would off gas at the higher temps.
I was planning on lining it with various dark cookie sheets, broiler pans or whatever I can come up with. May take a bit longer to preheat that way.

They have silicone oven liners but not sure how good they are and if they would be safe.


I have been using a sun oven for many years. You want the oven interior shiny to reflect the heat to the pot. Doug

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Bert

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Reply with quote  #15 
Doug,
There seems to be arguments both ways. I could test it both since it is shiny and can attach dark sides.

The reflective interior will reflect onto the pot but also back out the glass.
A dark interior would absorb the heat and hold in. The heat would eventually reach the pot.

I'm leaning toward the dark interior but hopefully I can test it with both.



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Bert K.
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sundug

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Reply with quote  #16 
Quote:
Originally Posted by Bert
Doug,
There seems to be arguments both ways. I could test it both since it is shiny and can attach dark sides.

The reflective interior will reflect onto the pot but also back out the glass.
A dark interior would absorb the heat and hold in. The heat would eventually reach the pot.

I'm leaning toward the dark interior but hopefully I can test it with both.




The solar cooking Yahoo group has shown the shiny interior to be more efficient than a black interior. We want the heat to go to the food, the most efficient way is to directly heat a black pot, as radiant energy is more a effective heat transfer method than convection. Heating the walls of the oven not only loses more heat thru the oven walls, but also then relies on heating the oven air to transfer heat to the pot. Doug

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dbc

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Reply with quote  #17 
Bert,
There is a write-up on Built it Solar for William Becker's cooker.  His design has a lot of similarities to yours.  The article has a lot of pictures and detail about the reflectors and base plate they are attached to.

He used 'composition board' (AKA Masonite) as backing material for the mylar sheets.  I guess it's light and stiff and cheap enough, and it holds glue pretty well, although I don't know how well it holds up outside.  It may be OK if it doesn't get rained on too much.  Seems to me some just stiff enough sheet metal would be better.  Something like 0.05 in. aluminum even better, although that may be more expensive and harder to find.  Becker used cut-up auto drip-pans (like you'd put under your old leaky VW bug) for the cooking box.  Maybe something like that would work for the reflector backing also.
Bert

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Reply with quote  #18 
Doug,

Thanks for the tip and info.

Don,

Several options there for the reflectors. Thanks.

Working on the door. I was going to put a door on the back for easier access but forgot when I finally got around to it. May still do that down the road.


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Bert K.
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sundug

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Reply with quote  #19 
Quote:
Originally Posted by Bert
Doug,

Thanks for the tip and info.

Don,

Several options there for the reflectors. Thanks.

Working on the door. I was going to put a door on the back for easier access but forgot when I finally got around to it. May still do that down the road.


I've been wanting to build a larger version of my sunoven, I have most of the materials, just haven't gotten around to it. Previously, I did build a couple of solar ovens, but once I lucked into a new sunoven still in the box, for $25 at a local junk store, I gave up on the homemade ones. It has several attributes that put it ahead of the homemade designs I have seen. Lightweight, altitude adjustable, tempered glass with a good seal, polished wind resistant aluminum reflectors that easily fold, portable, easy to clean interior, swing. I built a rotating table so I can adjust azimuth during the day. The two drawbacks with it's design for my uses are- 1) too small, I want to bake a full size pizza, and 2)front door means being blinded when opening it, letting the hot air out, and having to work over the lower reflector, glass being hinged is susceptible to breakage. So, my larger design will have fixed glass and a back door. Mylar left out in the weather soon clouds. Doug 

 https://www.builditsolar.com/Projects/SolarHomes/Doug/DougsProjects.htm

https://www.youtube.com/user/sundug69

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Bert

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Reply with quote  #20 
Doug,

I think I've seen your video on Youtube before.  Very lucky to find that deal on the sun oven. That's the one I wanted but couldn't afford. Try to model mine somewhat on it but a bit larger.

I wonder why they have the inside black? Wonder how it would perform with shiny walls inside.

I will be keeping an eye out for such a deal that you found. Better odds than the lotto. Right?


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Bert K.
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