I've done some checking on ...

I've done some checking on what might work on a system using solar radiation as the only source of heat energy. What might be worth trying is modifying the evacuated tube. By placing copper tubes inside a green house type enclosure, water could be heated some what efficiently. And by having the copper tubes end in an area of vacuum, steam should be what is discharged from the pipes. Remember, water boils at 50 degrees Celsius if it's atmosphere has 26 inches of vacuum. And any water which is still salinized or is impure could be discharged. The steam that such a system generates could rise over a barrier where it is cooled into condensate. And this condensate could be used to preheat water before entering the evacuated copper tubes. The link is to a diagram of an evacuated tube. One thing I like about this is that if the flow rate of water through the pipe is such that the pipe maintains it's maximum warmth, it would allow for a greater surface area to volume of water for transferring heat. I am working on something called Bessler's wheel which could provide mechanical energy to operate pumps with. One person who lives in Cairo, Egypt once posted that if such a thing were possible, he could use it to help people in the African bush who have water but have trouble pumping it from the well. There are other countries that have the same dilemma. It is something that could help impoverished people who do have clean well water available to them. At present, I am currently off work because I seriously injured my hand while working on Bessler's wheel. When my doctor gives me the green light to work with it again, then I'll be able to resume my work on it. It might be that it could get some other people interested in inexpensive water purifiers for humanitarian purposes. Any way, Hopefully. http://en.wikipedia.org/wiki/File:Evacuated_tube_diagram.jpg