For some time now I have been gathering information on another method of saving energy and taking advantage of the energy provided by nature, which is, after all, the near future that awaits us. In this case we are talking about how to make different types of solar cookerswhich, roughly speaking, is the use of concentrated solar rays to heat water or any other foodstuff. Before we start, if you are not able or willing to make your own, you can always have a look at Amazon and see if there is one to your liking.
We will look at various types of solar cookers, in order from least to most difficult to build, so let's start with the first one in video format:
As you can see, this solar cooker is made with a car sunshade and little else, something very cheap and ingenious for those days in the countryside or at the beach. By the way, the guy is a crack with the explanations 😀.
This second model is a bit more complicated but certainly more fun to make as well:
- Fairly tall cardboard box (like a shoebox).
- Aluminium foil.
On one side of the box we draw a line (B-C in the picture), cut from A to B and from D to C and fold downwards as shown in the picture.
Take two pieces of cardboard and place them so that they form panels 1 and 2 in the image above. The smaller the angle of these panels, the better the concentration of the rays and the more heat will be generated, so make sure that the angle is between 60º and 90º for optimum results. Cover 1, 2, 3 and 4 with aluminium foil.
Finally, a wooden slat or a piece of cardboard can be used to place the height adjuster on side 4 and stones can be placed in the gaps behind sides 1 and 2 to increase stability and wind resistance. The dimensions of this solar cooker are 32 cm wide, 42 cm high and 46 cm deep, giving enough heat to cook for two people.
The next model is the so-called double-box model, which is more effective and at the same time more difficult to build (don't get confused, in the following image there are two double-box solar cookers).
- Two cardboard boxes, one larger than the other.
- Aluminium foil.
- Pieces of cardboard.
First of all, we will have to introduce one box inside the other to make the measurements, ideally there should be a gap of at least 2.5 cm between boxes (both underneath and on the four sides), this gap will act as a thermal air insulator. Then, cut the corners of the internal box to the height of the large or external box.
In the picture above you can see the bottom divider made of cardboard strips, on top of which the inner box will be placed. The result would look something like this:
As a penultimate step, we fold the leguettes of the inner box outwards and line the inside of the box with aluminium foil. Then we make a lid with a support like the one in the following image and line the inside with aluminium foil. The lid must be in the position that reflects the sun's rays towards the inside, so it must not be fixed.
With this we have finished our double box solar cooker, if we want to optimise it a little more, we can paint it black on the outside, so it will attract more heat.
The last type of solar cooker we will show you is the parabolic solar cooker, which is the most difficult to build.
To make the reflector, you can use an old satellite dish that you no longer use and line it with aluminium foil. Below is a diagram with the different parts of the reflector:
Finally, here are a few interesting links on the subject:
Afraid, check Amazon to see if you can find a solar cooker you like at an affordable price. Also, this article has been compiled using GratisEnergia, Reutilizando and Ikkaro as sources.