85% efficient at taking heat and using it to evaporate water isn't that high, they are not talking about thermodynamic cycles producing work. This doesn't look

85% efficient at taking heat and using it to evaporate water isn't that high, they are not talking about thermodynamic cycles producing work. This doesn't look like something you would use to drive an engine with as for that you want the high temperatures that go with the high concentration of sunlight, as the amount of work you can get out is directly related to the relative distance of the hot and the cold end from 0K. edit: 0 - you must play the game 1 - you can never win 2 - you can only break even on a very cold day 3 - it never gets that cold