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Bear in mind this is all rough and ready - if you are interested in this topic there are some excellent research papers out there - try this one for starters
Extremely Cost-Effective and Efficient Solar Vapor Generation Under Nonconcentrated Illumination Using thermally Isolated Black Paper
DOI 10.1002/gch2.201600003
as this video is more or less based on that
![](https://s2.save4k.ru/pic/gS6GA1TGwZk/maxresdefault.jpg)