Solar cooking for everyone
Parabolic Cooker with circular bar support
The idea from this solar cooker was takin from a chair with the same tilting feature. The solar reflector is connected to two circular bars that is resting on a frame. When you need to change the position to remain in focus, you juset change the position of the reflector by sliding it on the two bars on the frame.
The idea behind is that the circular bars are sharing the focal point with the reflector. It means that in every position the parabolic will have the same focus point. You dont need to change the position of the cooking pot, just push the circular bars up and down.
The two wheels on the frame serve to turn the device around. One idea is also to connect the support for the cooking pot to the frame. In this model you would also have to adjust the stand for the cooking pot as you turn the frame around.
The reflector will stay in position when the position is changed. This is due to the friction between the circular bars and the bars on the frame.
The reflector is made up a real parabol and divided into parabolical strips that is adjusted to share the same focus. This model is a conceptual design, it is not jet constructed, still it is designed and calculated accurately. This means that the parabolical sheets have a real parabolic shape and they are all sharing the same focus.
Comment
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Comment by Magnar on November 24, 2009 at 1:36am - Yes exactly Brian, you got the point. The reflective strips can follow an arc and be connected two places, along with the right dimmension. This will be give an arc that is very close to a parabolic form. The focus point will not be in one point, but that is also not necessarry.
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Comment by Brian White on November 18, 2009 at 6:07pm -
I like it. It looks easier to manefacture too. You need parabolic on the long axis, but perhaps not on the strips of reflective material?
Arc of a circle might work?
If the strips can be stamped out all the same,(from aluminium or steel) it makes it easier.
Otherwise the strips at the center are slightly different than those at the edge and you might have a small nightmare in the factory.
Perhaps you would make them all the same from bendy material and then tension and stress gets them to the right curve as you attach them to the chair?
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Comment by Magnar on November 6, 2008 at 9:53pm
- Thanks to dr. Kundapur who has given me a reference to an earlier development on this kind of model. It can in other words be considered as a variation of a model developed by Nelpa of Prof Bernard of FIT design of Prof. Bowman. Check out the reference here: http://solarcooking.wikia.com/wiki/Plane_mirrors.
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