ESharp, how is it going with your project, all these years later? Is it still working?
I am researching the drainback principle. Where I have built a few systems, most of every system is a closed system, with anti-freeze (glycol). They do normally NOT drain back.
I am working on combining various technologies, to take solar thermal to a new level of both efficiency, simplicity as well as reliability (and less maintenance)
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Space heating/cooling and water heating by solar, Annual Geo Solar, drainwater heat recovery, Solar PV (to grid), rainwater recovery and more ...
Installing all this in a house from 1980, Copenhagen, Denmark. Living in Hong Kong. Main goal: Developing "Diffuse Light Concentration" technology for solar thermal.
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