Hey guys I am trying to design a efficient solar water distilling device for a school project. That image provides a general idea of what it will look like without going into specific detail in case other competing groups know of these forums. I have already a way to concentrate the sunlight to specific areas of the tray which has a thin layer of water. I do not completely grasp the advantage of concentrating the energy to one point rather than an even distribution since there is no increase of energy. I was thinking about using some low priced solar panels hooked to resistors that run through copper tubes in the water to heat the system. When I went to a local electronics shop they told me the idea is not practical because the solar panels will not produce significant wattage to cause heat. Any counter arguments? If I had more time, I wanted to build a parabolic dish to concentrate energy to a pressure controlled system (control pressure to lower water boiling point) to increase efficiency but my group has decided against it due to the complication of calculating exactly where the parabola's focal point is and building a parabola mirror system is not practical for the time given. So as you guys can see I am not asking you to design my project for me because we do have ideas on the table, but maybe someone here can help with some suggestions. Thank you for your help.