Sunny Cooker (Tan) - Solar Cooking

Sunny Cooker (Tan)

A string is added across the base panels to helpmaintain shape.

The price of corrugated cardboard, which is widely used for the making of low cost solar cookers, has been rising at an

annual rate of 15-20% in recent years. The price rise is due to the costlier energy, labor, chemical products and recovered

paper, which are used for making corrugated cardboard. The cardboard price increase may not have an impact on those

solar cookers made from used cardboard boxes, but it would impact those made from newly purchased cardboard material.

Cardboard price increase is inevitable, but we could alleviate the cost impact per solar cooker if we are able to reduce the

amount of construction material needed in making each solar cooker.

In early 2008, Teong Tan set a goal to create a functional solar cooker, from a flat sheet of cardboard, by using 25% less

material than that required for a CooKit solar cooker. The end result, after about eight month's time, is the Sunny Cooker.

The Sunny Cooker, made from a 36" x 36" sheet of cardboard, has multiple triangular shape reflector panels to help focus

sunlight towards a cooking pot. It is designed in such a way that its contour can be easily re-shaped, simply by tilting the

cooker forward or backward. Altering the contour of the cooker would enable the cooker to become more efficient in

capturing the sunlight at different sun angles.

Material and construction stepsTo construct a Sunny Cooker, this will require a square sheet of corrugated cardboard measuring 36”x36”, aluminum foil

and glue. The following are the construction steps for the Sunny Cooker:

Glue the aluminum foil on one side of the square cardboard.1.

Draw cooker’s outlines and fold lines on the aluminum side of the cardboard. Make sure that the cardboardcorrugations or flutes run vertically from the top to the bottom.

2.

Cut away all unwanted parts.3.

Crease and fold along the fold lines.4.

Cut open the four slots, and widen them to about the same dimension as the thickness of the cardboard.5.

Cooker assembly and setting cookerFor a new cooker, crush the corrugations or flutes within the two locking tabs first before using it. This will make it easierto bend and insert the locking tabs through the slots.

When the sun’s angle is below 50°, assemble the cooker by inserting the two locking tabs through the two upper slots. When the sun’s angle is above 50°, assemble the cooker

by inserting the two locking tabs through the two lower slots.

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The vertical section of the cooker's panels can be tilted backward, and

kept in the desired position, by wedging a small stone under the lower

edge of the two vertical panels on the side. Backward tilting of the

cooker will allow for better focusing of the sunlight towards the cooking

pot when the sun moves to a higher altitude.

Settings and cookingTo cook, put food in a black metal pot (3 to 4 liters size), and cover the

pot with a clear glass lid. Enclose the pot inside a clear oven bag, if

available, and place the cooking pot on top of the cooker’s base. Set the

cooker according to the instructions in the two previous paragraphs, and

face the cooker directly towards the Sun to start cooking. Adjust the

cooker, from time to time, to ensure that the sunlight stays focused on

the cooking pot. Tilt the cooker forward, as shown in the above

illustration, should there be a need to start cooking even when the sun is

still low, less than 35°. It would also help if the cooking pot is raised higher by an inch or two, with a support, to better

capture the low sunlight.

Storage and TransportationThe Sunny Cooker can be fully folded by first releasing the two locking tabs from their slots, and following the folding

steps shown in the illustrations below. A fully folded Sunny Cooker measures about 21”x18”x3”. Some of the joints,

between panels, may remain flat when a folded cooker is taken out of storage and re-assembled for use. To correct

this, it is necessary to refold the cooker, along its existing fold lines, and adjust the panels until you get an even

cooker curvature. I hope that the introduction of the Sunny Cooker design will be able to help bring about meaningful

savings due to a reduction in the amount of construction material required.

External linksTeong Tan's page about the Sunny Cooker

Categories: Solar cooker designs Solar cooker plans Solar panel cooker plans Solar panel cooker designs

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Sunny Cooker - Construction Plan

INTRODUCTION:

The price of corrugated cardboard, which is widely used for the making of low cost solar cookers, has been rising at an annualrate of 15-20% in recent years. The price rise is due to thecostlier energy, labor, chemical products and recovered paper,which are used for making corrugated cardboard. The cardboard price increase may not have an impact on thosesolar cookers made from used cardboard boxes, but it wouldimpact those made from newly purchased cardboard material. Cardboard price increase is inevitable, but we could alleviate thecost impact per solar cooker if we are able to reduce the amountof construction material needed in making each solar cooker. In early 2008, I set a goal to create a functional solar cooker,from a flat sheet of cardboard, by using 25% less material thanthat required for a ‘CooKit’ solar cooker. The end result, afterabout eight month's time, is the ‘Sunny Cooker’. The ‘Sunny Cooker’, made from a 36" x 36" sheet of cardboard, has multiple triangular shape reflector panels to help focus sunlight towards a cooking pot. 'Sunny Cooker' is designed insuch a way that its contour can be easily re-shaped, simply bytilting the cooker forward or backward. Altering the contourof the cooker would enable the cooker to become more efficientin capturing the sunlight at different sun angles.

SUNNY COOKER | Simple Homemade Solar Cookers for Easy Sol... http://www.freewebs.com/sunnycooker/sunnycookerplan.htm

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Sunny Cooker in normal low-sun-angle setting (For cooking when: 35o < sun angle < 50o)

Sunny Cooker in mid-sun-angle setting & tilted backward (For cooking when: 45o < sun angle < 60o)


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Sunny Cooker in high-sun-angle setting & tilted backward (For cooking when: sun angle > 50o)

MATERIAL and CONSTRUCTION STEPS:

To construct a ‘Sunny Cooker’, this will require a square sheetof corrugated cardboard measuring 36”x36”, aluminum foil andglue. The following are the construction steps for the ‘Sunny Cooker’:

Glue the aluminum foil on one side of the squarecardboard.

1.

Draw cooker’s outlines and fold lines on the aluminumsideof the cardboard. Make sure that the cardboardcorrugationsor flutes run vertically from the top to the bottom.

2.

Cut away all unwanted parts.3.Crease and fold along the fold lines.4.Cut open the four slots, and widen them to about thesamedimension as the thickness of the cardboard.

5.


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Please click on the link below if you need a .cdr format copy of the'Sunny Cooker' plan. I used the Corel Draw to create the plan.http://webzoom.freewebs.com/sunnycooker/Sunny CookerPlan.cdr

COOKER ASSEMBLY and SETTINGS:

For a new cooker, crush the corrugations or flutes within thetwo locking tabs first before using it. This will make it easierto bend and insert the locking tabs through the slots. When the sun’s angle is below 50o, assemble the cooker byinserting the two locking tabs through the two upper slots. When the sun’s angle is above 50o, assemble the cooker byinserting the two locking tabs through the two lower slots.


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http://webzoom.freewebs.com/sunnycooker/Sunny


The vertical section of the cooker's panels can be tilted backward, and kept in the desired position, by wedging a small stone underthe lower edge of the two vertical panels on the side. Backwardtilting of the cooker will allow for better focusing of the sunlighttowards the cooking pot when the sun moves to a higher altitude.


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SETTINGS and COOKING: To cook, put food in a black metal pot (3 to 4 liters size), andcoverthe pot with a clear glass lid. Enclose the pot inside a clear ovenbag, if available, and place the cooking pot on top of the cooker’sbase. Set the cooker according to the instructions in the twoprevious paragraphs, and face the cooker directly towards the Sunto start cooking. Adjust the cooker, from time to time, to ensurethat the sunlight stays focused on the cooking pot. Tilt the cooker forward, as shown in the above illustration, shouldthere be a need to start cooking even when the sun is still low, lessthan 35o. It would also help if the cooking pot is raised higher byan inch or two, with a support, to better capture the low sunlight.


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Sunny Cooker and 4L size pot with a clear glass lid (4L size pot achieved 156 degree C temperature) STORAGE and TRANSPORTATION: The ‘Sunny Cooker’ can be fully folded by first releasing the twolocking tabs from their slots, and following the folding stepsshownin the illustrations below. A fully folded ‘Sunny Cooker’ measuresabout 21”x18”x3”.


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Some of the joints, between panels, may remain ‘flat’ when afolded cooker is taken out of storage and re-assembled for use. To correct this, it is necessary to refold the cooker, along itsexisting fold lines, and adjust the panels until you get an evencooker curvature. I hope that the introduction of the 'Sunny Cooker' design willbe able to help bring about meaningful savings due to a reductionin the amount of construction material required. Teong H Tan23 August 2008

Improvement Modifications for the Sunny Cooker

Gravity and repeated folding of the cooker can cause the twolower reflectors, in the front, to flatten out and the cooker toloose its desired cooker's shape. This can be seen in the photobelow, where the front edges of the lower panels no longerform a nice upward curve.


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In order to correct this situation, a string can be used to pullthe two lower panels closer together in order to restore thedesired cooker's shape. See photo below, whch shows the frontedges of the lower panels forming a proper upward curve.

Another modification that can be easily incorporated, in orderto increase the amount of sunlight being reflected towards thepot, is to make an alteration to the two triangular reflectors, inthe middle of the cooker, as shown in the photo below.


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Below is a photo of the modified Sunny Cooker with a pot inthe middle of the cooker. The reflections of the pot can be seenon all the reflecting panels.

Teong Tan3 October 2010

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Sunny Cooker (Tan) - Solar Cooking

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