This is a large Fresnel Lens focused on a copper tube with a 12 V pump (powered by two 6 watt solar panels) with water circulating through the unit. Water, seven gallons, was raised from 63 F to 106 F in one hour. It is not super efficient as heat is lost at the open top of the glass tank. This is designed to illustrate one method of solar heating a swilling pool with a Large Fresnel Lens. TESTING HDD AQUA BLOCK.
I think, if you put the watter higher , you will not need the pump
nescisary necisary nessseccary
What camera do you use for the slow motion stuff?
Now if you took that design you have going with the copper tubes, added a lot more curves and length of tubing, painted it black and simply placed it in the sun on its own without a fresnel lens, would you be able to achieve the same effect on a smaller scale?
Spot the lizard at 3:33 !