The most efficient shape would be parabolic, but granted they are difficult to construct by hand -
http://www.acrosolarlasers.com/dishkits.html you could also make a trough shape as easily as a cone, but they are generally only practical for heating water by running a pipe down the focal point with pumps and stuff. Saw several types of solar cookers recently at Maker Faire as well, that used easy to find materials - http://blog.makezine.com/archive/2008/06/solar_ovens_and_solar_coo.html I would also point out that heat and temprature are different things. 100 deg. C sounds like it would boil water but there might not be enough heat to be practical. As an example, a lit cigarette is around 400-500C but not very useful for cooking. cheers, d fyi - my yurt at BM last year did a great job at 'cooking' my neighbors in their tent. <grin> ________________________________ From: Richard Ginn <[email protected]> To: [email protected] Sent: Friday, June 12, 2009 5:13:48 PM Subject: [hexayurt] Re: The Giant Solar Funnel Manufacturing this would be as simple as an aluminized sheet of plastic with a locator hole where it is connected to make the ideal cone shape. Of course, then you are into manufacturing something instead of just using a 4x8 sheet and some glue and foil. Anything non-flammable would work to raise a pot up into the focal point, if that were even neccessary: The point might be right where a pot sits on the bottom surface anyway. Is there some way you could simplify this design? [that's a joke, probably can't simplify this much. beyond making a different custom shape flat sheet] Note: What is this sheet of material called, in Home Depot or some store like that? On Thu, Jun 11, 2009 at 8:37 PM, Vinay Gupta <[email protected]> wrote: >http://vimeo.com/5112443 > > >Video of a new design for a solar cooker. Uses a whole 4x8 sheet so you know >who designed it ;-) > > >Needs some work on the pot holder part of the affair, but you get the idea. >Anybody want to give it a try somewhere warm? > > >Vinay > > > > > >-- >Vinay Gupta >Free Science and Engineering in the Global Public Interest > > >http://bit.ly/flucode - please follow the Flu Code >if you are in a flu-effected area. It protects us all. > > >http://guptaoption.com/map - social project connection map > > >http://hexayurt.com - free/open next generation human sheltering >http://hexayurt.com/plan - the whole systems, big picture vision > > >Gizmo Project VOIP : (USA) 775-743-1851 >Skype/Gizmo/Gtalk/AIM: hexayurt >Twitter: @hexayurt http://twitter.com/hexayurt >UK Cell : +44 (0) 0795 425 3533 / USA VOIP (+1) 775-743-1851 > > >"If it doesn't fit, force it." > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "hexayurt" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/hexayurt?hl=en -~----------~----~----~----~------~----~------~--~---
