Magnar's Page

To mark the big climatic event with the world top leaders that takes place in New Your these days, this is my two cent to save the planet. Hopefulle it gives inspiration to twist your head once again to find new ways you can reduce CO2. I think it is time to look for new solutions in all directions. Solar cooking is one of them, and I have just made a new design wich I call a Circular Solar Cooker.

The Circular SoIar Cooker is a foldable solar cooker that is easy to carry, easy to set up and of… Continue

Hot water is not taken for granted everywhere in the world. It demands a lot of energy and in some countries this often means burning coal or wood. Another alternative is to take advantage of the sun. A normal plastic water botle of 10 liters covered in black can be heated to just above 80 degrees C before the plastic starts to melt down. Even 60 -65 degrees is enough for getting safe driking water. Water heaters does not have to be very complicated. A black botle is enough to get water heated u… Continue

This time I wanted to get to the real thing. I found some people who where willing to put it together and after a week they came back with a brand new solar cooker. I wanted the solar cooker to be done locally to stimulate local business. This was just the first model we tried out, and there should always be room for improvements. But I was very happy that this first solar cooker turned out to be succsessful. After cooking and tasting the food with my friends it turned out to be a very nice expe… Continue

Lately I have tried to build some of the 3D models based on 2D printouts. Of course it is possible to put the models out in the STL format and send them over to the folks at CAD span. But the price tag is still a bit heavy. As I am on a low budget, I found it therefor more helpful to make the models in 3D on my computer and then project them piece by piece onto a 2D format. On a small scale base, they then can be printed out on a ordinary printer before being glued and put together in its ordina… Continue

There seems to be an widespread confusion about how solar rays reflect in an cone. If sun rays was like water, it is easy to believe they would "fall" down the tube and end up at the bottom of it. This is certainly not the case. Sun rays reflect on a surface (generelly) with the incomming angel equal to the outgoing. To understand what I mean take a look at the illustrations here:
This has some very strange con… Continue