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Solar Cookers:Sun Powered Cooking

byMary-Stewart Droege

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Solar Cooking in the Sudan

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Overview• What is a solar cooker and why is it used?• What are the different kinds of solarcookers?• What kinds of foods can be prepared with asolar cooker and key cooking tips?

• How do you make a solar cooker?-What materials are needed?-What are the assembly steps?-Final set-up and cooking .

• Closing Comments and Questions.

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What is a Solar Cooker?

A solar cooker is a device which usesthe energy of direct sunlight to heat,cook or pasteurize food or drink .

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Why Use a Solar Cooker?

•

Relatively cheap, low-tech device;• Uses no fuel and costs nothing to operate;

• Reduces pollution and deforestation; and• Easy to use and maintain.

PizzaBoxCooker

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How Do Solar Cookers Work?

•

There are two categories of solar cookers:-Concentrating solar cookers; &-Solar box cookers (solar ovens).

• Cooking requires sunlight;• Cooker must be oriented to the sun;

• It retains heat from the sun and focuses it on acontainer that holds the food and which traps the

gathered heat.

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SmallBox

Cooker

Parabolic CookersFolding PanelCooker

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Food and Cooking Tips • Any kind of food you would cook in an oven or a stove;• Safe to place raw, refrigerated or frozen food in asolar cooker in the morning several hours before the sunbegins to cook it;•

Once the full sun is on the oven, typically the heating offood proceeds quickly enough so that there is no dangerof food spoiling.

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More Cooking Tips

• Use dark colored cookware;• Divide food into several pots;

• Cooking time is typically twice as long;• Start in the morning not the afternoon;• Cooking temperature from 200 degrees

Fahrenheit to 325 degrees Fahrenheit . -Sky blue=good cook day-Sky grey=poor cook day

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Solar Cooker and FoodCart

Restaurant uses solar cookers(Peru)

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How do you makea solar cooker?

-What materials areneeded?

-What are theassembly

steps?

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You need following items:• Ruler, scissors, cutting knife &

surface;• One roll of aluminum foil;• Packet of black construction

paper or black spray paint;

• White glue or spray glue;• One Inner box (12”*12”*12”);• One outer box (14”*14”*14”);• 4 sheets of 20” by 30”

heavy cardboard or foam core;• Duct tape and cord;• Staple gun or stapler optional; &• Compass, support rods & velcro

are optional.

Materials andAssembly

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• Outer box should be larger

at least 1/2 inch (1.5cm) ormore all around to createinsulating airspace betweenthe two boxes;

• Wrap, glue and smoothaluminum foil inside theouter box, and finish edgewith duct tape to retainheat.

• Wrap duct tape around thebox base to weatherproof.

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• Shred or crumble newspaper orscrap paper and insert inside the

outer box to cushion the inner box.

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• Remove flaps on inside box. You can keepor remove flaps on outside box.

• Glue black construction paper to insidebox, apply duct tape along top edge andthen place in larger box.

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• Cut cardboard or foam core flaps asshown below;• Width of each narrow end of each flapshould equal the width of the side you’ll beattaching it to;• Width of each flared end should beseveral inches wider than the width of thenarrow end.

FLARED

NARROW

Punch two holeson each side ofthe flap for cord..

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Glue aluminum foil to one side of

each reflector flap.

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Attach each reflector flap to the top ofone side of the box. You can tape or staplethem as necessary, allowing them to flopover.

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Prop up each reflector at around a45 degree angle .

•

Connect the reflectors together at the flaredtop corners tying them together with cord orvelcro straps and then undoing them for

disassembly. Support dowls or rods can be used onwindy days.

Support for reflector flapsTIP:If youwant tomeasure45degreesuse a

compass .

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• Put food in dark pot in the smaller boxto cook food.

• Position the oven in full sun andstart cooking .

• You may need to reposition your boxseveral times while cooking in order

to catch the sun .

TIP:Use oventhermometertochecktemperature.

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Example of a solar cookeddish.

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Solar Cooking ResourcesYaffe, Linda Frederick. Solar cooking for home and camp. Mechanicsburg, PA, Stackpole Books, c2007. 120 p.TX835.5.Y34 2007Table of contents online http://www.loc.gov/catdir/toc/ecip079/2007003173.html .

Solar Ovens Society SOS) http://www.solarovens.org/“The SOS exists to promote solar cooking to the American public

and to provide a way to partner with the over 2 billion people worldwide who lack adequate fuel for cooking their food.” They produceand ship cookers overseas, as well as offer them for sale. The sitealso includes a number of recipes.Solar Oven Development and Testing Project (Florida Solar Energy Proj

ect) http://www.fsec.ucf.edu/en/research/solarthermal/solar_cooker/index.htm

The Florida Solar Energy Center conducted a research project to improve the performance, reliability and cost-effectiveness of low-cost solar cookers for use in developing nations .

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Questions???

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• Place a digitalthermometer withrange: -65ºF to450ºF) in pot withwater in box;

• Establish initial watertemperature.

• Close the lid and keepthe oven in the sunmaking sure thesunlight fromreflector reflects

directly into the oven.

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• The interior box is spray painted black.• It serves following purposes:

-Painted black helps retain heat,heats up the cooking pot, and holds thepot.

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• Make a lid by folding he four corners of a flat board.

• Cut three sides of the lid.

• Create opening match opening of the inner box.• Glue the inner side of the lid with aluminum foil.

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Glue the oven cooking bag on the innerpart of the lid to cover the opening.

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• Now the solar oven is completed and

d t.