Keeping thermocline in a solar water heater

I seem to be inventing, in these conceptual notes, a combination thermosiphon/active solar water heater. Reviewing after 12 years, I'm not sure if this idea has a chance of working or not; certainly most systems I've seen just assume and accept turbulent mixing and extra-power-burning pumps as the design foundation and build from there, rather than more patiently explore how even subtle tweaks of elevations and flow-shaping devices might optimize whole-system design. If impractical for now, it was fun to think about; and maybe it'll be practical later, for someone, which is the point. Best for open loop systems I should think.

Your thoughts?
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