HELP! Solar oven problems.
by Ho Yoon Yee
(Singapore, Bukit Batok)
My group is doing a solar oven for our graded assignment. So far we wasted three days making two useless prototypes that cooled down the water that we were supposed to heat up.
1) Prototype must be no bigger than 1m by 1m by 1m.
2) Prototype has to heat up 200ml of water in five minutes (preferably up to 60*C for a average grade)
3) Try to use recycled materials for prototype (we already spent a good sum of money on this thing)
General Questions:(if we ever get that far)
1) Where should we paint black: inside, outside or both?
2) Must our reflectors be at a 45 degree angle? Or what angle must it be at?
3) How do we airtight the whole thing but still be able to put in and then retrieve our beaker of water without taping, gluing etc shut the opening of the box?
The setup will be exposed to the sun at about 11-1pm for the actual test, but we have trial tests at 3-5pm every afternoon.
We do not have access to windows, hinges, fiberglass, wood or any fancy materials. I live in Singapore there aren’t many home improvement or hardware stores so I can’t find these stuff. Unused CDs are also quite hard to find. Well, we do have: (50x30x20) cm cardboard box, some black acrylic paint, cling wrap, not-so –shiny aluminum foil, shiny gift wrapper, and the sliver cardboard thing that cakes sit on when you buy them from the bakery. Temperatures on our hot days: 32*C-36*C
Please help us. We need to get this done by 23/03/13 or we will fail our practical graded assignment!
Thank You! :)
Let us see if we can get you some help and advice for your project.
I do not have the time to respond with much helpful details at this moment since it is very late, but tomorrow I will be able to do so.
Let's see if anyone else can help at the moment.