Comment Different kind of APIs (Score 1) 173
Comment Numbers correct? (Score 1) 112
Comment Could still be overthrown (Score 3, Informative) 134
Comment Acer Travelmate B117M (Score 1) 187
Comment Old hat? (Score 3) 80
Solar thermal collectors that can boil water have existed for decades. You don't need concentration for that, simply use a black absorber plate with pipes under a glass plate and put a vacuum between the absorber and the glass. Selective absorbers or glasses will improve the efficiency.
There are two problems with it: The generated steam will have a low temperature not much above boiling water. Most industrial applications need process steam of a much higher temperature (although there are some exceptions).
There are also problems with the two-phase flow of the steam-water mixture in the pipes, which is generally unstable and difficult to control. Technically it is much easier to concentrate sunlight, use an oil with a high boiling point as the carrier liquid and use it to generate the steam in a seperate unit.
Comment Re:There is some Background ... (Score 1) 394
Comment What about butter? (Score 1) 851
Comment Re:Since this is an OSS project ... (Score 1) 254
Comment Re:Nothing new (Score 1) 202
Richard Stallman's Solution To 'Too Big To Fail' 649
Comment No reputation (Score 3) 247
Coming To a War Near You: Nuclear Powered Drones 202
Comment Re:Big Empty Space (Score 1) 608