I just built a heat exchanger for my DIY solar hot water system.
I am planning on an INSTRUCTABLES on this, but I thought I would tease you all with some photos for now.
Basicially, it's a tube inside a tube to that anti-freeze that is heated by a solar panel can heat up otherwise cold water that then goes into an insulated storage tank (an old electric water heater) and then into my standard natural gas water heater.
This is sort of a little experiment, and I have never done copper soldering before, so, yes, I already know how sloppy it is!
Hot fluid from solar goes in and out the the skinny inner tube, and water to be warmed in the hot water tank thermo-siphons through the thicker outer tube through the T-connections.
See all photos at:
Solar Heat Exchanger construction - a set on Flickr
