With this reasoning the question at issue of this project could be considered answered.
72 14 Discussion When a good design and material is decided, our suggestion is to ask local families if they want to be involved in the study by cook water and food by using the solar ovens in their everyday life. Families who are interested get an oven which they can keep even after the tests are finished. If they know that, maybe the possibility of a good cooperation becomes better and the local families see the knowledge of the solar ovens as more important. This implementation would give the project good experience as to how to make the ovens more practically useful. Because, after all, it is the people that are suppose to use the ovens who best know what they want them to look like. To manage the cultural problem that the solar oven technology is new, unknown and therefore will not be used by the locals, we have some tips for the future. Let this kind of implements take a long time. Do not just put out the equipment and leave the place but have patience and teach all the people who are interested in how it works. Try also to involve the solar oven technique in the schools so the children who grow up not seeing it as something strange but a natural aid to cook food or pasteurize water. We think that different kinds of solar ovens are necessary to meet the different markets in the world. One more high-tech version with a very effective design and materials may be the best choice to the person who can afford a higher price. Here it is a minimum of time and a maximum of temperature with the most comfortable way of cooking, something to strive for. When giving poorer people a possibility to use the advantage of solar ovens the same principals are important but a low price may be the most essential. This means a less complicated version with cheaper materials. In both cases it is however fundamental that the construction actually works and is able to boil water in an acceptable time and that the production does not have a larger effect on the environment than the product was made to prevent. Regardless the type of solar oven, more extensive corrugation tests are needed before the final material can be decided. Further tests would guarantee a more long term solution and give an answer as to how the solar ovens are affected by different weather conditions and types of use. During this project many ideas have emerged of how the ultimate solar cooker could look and which material it could be constructed of. The time and the resources have been limited so a lot of the ideas have never been possible to build or test. One example of a cheap and probably rather effective solution is a parabolic design made by plastic from recycled water and soft drinks PET bottles. The outside of the transparent material is sprayed with a high reflecting spray colour, for example the same type that is applied on the reflector in a flashlight could be used. Actually a solar oven handles the light rays as a flashlight but contrary. The rays comes from above and focus on the centre of the oven’s construction while
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