It's Christmas here so hope ...

It's Christmas here so hope everyone is enjoying their day. Tarig, to evaporate about 30 liters per/hr., takes a reflective surface of 36 square meters. This assumes the water is 10 C and solar radiation is 700 watts. This does not consider using condensed steam to assist heating untreated water. Also, the effects of vacuum are not considered. A float actuated valve for flow control would be needed. For something like this, if space is available, length simplifies this concept. If it is 12 meters long, then the reflective mirror on each side only needs to be 1.5 meters wide. Also with length, if condensed steam could flow under the water being heated, then this would increase efficiency. If you want to try this, you can scale it down and then could consider with those results if it is something you think would be helpful to you. 20 inches of vacuum lowers the boiling temperature of water to 70 C. As such, efficiency should increase by 30%. There is a cost versus effort that might or might not make it worth your time. The link is to a basic diagram showing untreated water's flow path to becoming steam then condensing and flowing underneath untreated water. Most construction could be plywood with Plexiglas (plastic sheet) separating the treated and untreated water. The enclosure exposed to reflective mirrors could be plastic sheet but it would need to with stand the effects of steam. It's thickness would have to be considered. acrylic may be necessary as it requires from what I found, 130 C. to bend. http://i979.photobucket.com/albums/ae278/bessler_supporter/Untitled_zps359ab215.jpg