Hey ! as i got interested many ways of using solar thermal energy, i discovered the evacued tube ones, and i foud a solar entusiast that made himself from basig items (bottle, epoxy, vacum machine) the name of the channel i'm sure some of you already knows is GREENPOWERSCIENCE.
As i haven't a vacuum machine yet and am not sure to want to use expoxy yet, i went to a big supermarket looking for 2 big jars fitting inside each others, with success, (it fits perfectly!) the more little ones being 1,3L
At first i used a tomato sauce ~700ml (painted black outside) to fit inside, (normal apple juice bottles are too long), but i wanted to have larger water heated at time.
So, as i didn't wanted to paint the 1,3L glass tube i sculpted 2 slates, one with a round shape to put inside, and one rectangular to fit vertically and perpendicular of the sun direction, it "tints" the water quite well with the help of the natural optic effect (i don't remember the name.)
I first projected to glue the big jar's mouses together, letting a valve to pull vacuum inside when i'll have acces to the machine, the i tought i could just try to produce some dryed co2 with the help of yeast...
Finally, for the moment, have'nt done all of that, but it works quite well !!
I forgot to say that these are put inside an open ~1 meter wide open inox reflector "made" from a recycled farm milk tanks having more or less the good shape for a reflector.
I love you liquid captor system, i'd like to do one myself soon ! It looks like one of the projects of Sergiy Yurko' channel
About the circulation of liquid, why not to use thermosyphon like it can be done in ponds bottom's shaping ?
