This is a Panel oven. As you can see it is very cheap to make and takes a longer time to cook. The mirrors or tin foil help reflect the sun to the pot. This would be the one I would suggest for people who don't want to spend money. This could be used to slowly cook food and boil water. I think this would be the best choice for people in a third world country because it is cheap and does it's job well.
"PAKISTAN RENEWABLE ENERGY SOCIETY." PAKISTAN RENEWABLE ENERGY SOCIETY. N.p., n.d. Web. 04 Nov. 2013. <http://www.pres.org.pk/category/re-technologies/solar-energy/solar-thermal/solar-cookers/>.
"Home Guides." Home Guides. N.p., n.d. Web. 04 Nov. 2013. <http://homeguides.sfgate.com/three-main-types-solar-ovens-79592.html>.
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