Urgent Evoke

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with this solar oven my partner javier (the guy with short hair) and I (the guy with long hair), we won the first place in the national competition in my country (chile) solar cookers.
I leave here the steps we take to create this solar oven:

Solar Oven





zinc-plate avalanche (steel plates coated with aluminum and zinc (Al-Zn))

This last is not necessary

bid-pen or similar insulating

-foil (instead of this and it would be better but it means more work and time would be to have several pieces of broken mirrors)



"The first is to form the parable, in this case how the students zinc plate (if you ever use this plate short of a careful because maneraa ...)

Ideally, the parable diameter = 50 cm. The parable do it with any material that is easy to handle.

After you have formed the parable is the assembly of the box or container of this. For this case we use Trupa, a wood pretty easy to manage and shape.

Once ready the container placed in the parable, we affirm the club and putting pretty well on the edge silicone also in order to prevent heat go through small h***s.

We continue to the next step to isolate the furnace, in this case we use mostly

Polystyrene is a thermoplastic polymer. Try to make it all good filler, so the heat can not escape you anywhere.

After having the entire skeleton and we'll be ready in the parable what we are used to refract solar radiation, in this case you use foil, you could also use mirrors.

By pasting spend some objects without breaking the paper .. to smooth wrinkles and run out. Well well to complete the parable and part of what is around the idea of this paper is to paste or mirror wherever sunlight reaches (that if you do like us, because we also did two covers with foil the which receives the solar radiation capture other angles and q of the radiation is refracted in the oven)

Then comes the final part which is to put the lid that has to be glass or clear plastic.

Solar furnace operation:

Copper coil motor oil filling: In the solar furnace is placed a copper coil that goes from the bottom of the oven (which receives direct sunlight) to the top where the vessel will be heated. The copper coil is filled with motor oil for three reasons:

- A motor oil is heated quickly and very well while maintaining the temperature

- Secondly we have the convection is one of the three forms of heat transfer and is characterized in that it occurs through a fluid (air, water) that transports heat between areas with different temperatures. The convection occurs only through fluid materials. These, when heated, increase volume and thus decrease its density and displacing the fluid amount is at the top and is cooler.

- And the other is to use another method of heat transfer:

The driving on this same oil and use the solar radiation to heat the copper coil, this coil has direct contact with the container, so there is a transfer of heat.

Function oven: the oven itself consists of two spaces:

One, which is the main (where will the recipient) consists of a parabolic aluminum which refracts the radiation toward the center.

And the second is a closed space which also consists of aluminum to refract radiation but there is the beginning of the copper coil, which serves as a benefit but the radiation from the sun as the space is very limited at higher angles.

Ahora en español:

Horno solar

-serpentin de cobre
-aceite de motor
-plancha de zinc alud (planchas de aceros revestidas con Aluminio y Zinc (Al-Zn))
Esta ultima no es necesaria
-pluma bid o cualquier aislante parecido
-papel aluminio ( en vez de esto y que resultaría mejor pero significa mas trabajo y tiempo seria tener varios pedazos de espejos rotos)


-Lo primero es formar la parábola, en este caso la formamos con la plancha de zinc alum( si llegas a usar esta plancha cuidado porque corta de una maneraa…)
Lo ideal seria que la parábola sea de diámetro= 50 cm. La parábola hazla con cualquier material fácil de manejar.
Luego de que hayas formado la parábola viene el armado de la caja o contenedor de esta. Para este caso usamos trupan, una madera bastante fácil de manejar y dar forma.

Una vez listo el contenedor colocamos la parábola, la clavamos y afirmamos bastante bien poniendo silicona en las orillas también con el propósito de evitar que el calor se vaya por pequeños orificios.

Continuamos con el siguiente paso aislar el horno, en este caso usamos en su mayoría
Poliestireno que es un polímero termoplástico. Trata de que quede todo bien relleno, así el calor no se te escapa por ninguna parte.

Luego de tener toda el esqueleto ya listo vamos a pegar en la parábola lo que vamos a utilizar para refractar la radiación solar, en este caso usamos papel aluminio, podrias usar espejos tambien.
Al pegarlos pasa algún objeto que no vaya a romper el papel..para alisarlo y que quede sin arrugas. Bueno así hasta completar la parábola y parte de lo que la rodea la idea es pegar de este papel o espejo en cualquier parte donde llegue radiación solar ( eso si es que lo haces como nosotros, ya que nosotros hicimos dos tapas también con papel aluminio la cual recibe la radiación solar de otros ángulos y captura parte de la radiación q se refracta dentro del horno)

Luego viene la parte final la cual es colocar la tapa esta tiene que ser vidrio, o plástico trasparente.

Funcionamiento del horno solar:

Serpentín de cobre relleno de aceite de motor: En el horno solar se dispuso un serpentín de cobre que va desde la parte inferior del horno (que recibe radiación solar directamente) hasta la parte superior donde se pondrá el recipiente a calentar. Este serpentín de cobre esta relleno de aceite de motor por tres razones:
- una el aceite de motor se calienta de forma rápida y a la vez mantiene muy bien la temperatura
- segundo tenemos la convección que es una de las tres formas de transferencia de calor y se caracteriza porque se produce por intermedio de un fluido (aire, agua) que transporta el calor entre zonas con diferentes temperaturas. La convección se produce únicamente por medio de materiales fluidos. Éstos, al calentarse, aumentan de volumen y, por lo tanto, disminuyen su densidad y ascienden desplazando el fluido que se encuentra en la parte superior y que está a menor temperatura.
- Y la otra es usar otro de los métodos de transferencia de calor:
La conducción, en este usamos el mismo aceite y la radiación solar para calentar el serpentín de cobre, este serpentín tiene contacto directo con el recipiente, por lo tanto se produce una transferencia de calor.

Función del horno: el horno en si consta de dos espacios:
Uno el cual es el principal (donde se pondrá el recipiente) esta formado por una parábola de aluminio el cual refracta la radiación hacia el centro.
Y el segundo espacio el cual es cerrado consta también de aluminio para refractar la radiación pero hay se encuentra el inicio del serpentín de cobre, el cual c**ple la función de aprovechar mas la radiación del sol ya que el espacio superior es muy limitado en ángulos.

Views: 674

Comment by Amanda Jeffrey on March 12, 2010 at 2:58am
Fantastic - well done to you both for winning the competition too! What kinds of temperatures can you reach in a day of sun?
Comment by Gene Becker on March 30, 2010 at 2:28am
This is a great project! Thank you for openly sharing your knowledge of how to build the oven, this is very much in the spirit of EVOKE Knowledge Sharing. +20 KS.
Comment by Massive Attack on March 30, 2010 at 10:10pm
Most excellent
Comment by Bonan Zhang on April 30, 2010 at 4:48am
Awesome! What have you guys been cooking?


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