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Thread: Pool Heating

  1. #1
    Gold Member daveob's Avatar
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    Feb 2008
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    Pool Heating

    Need some opinions here please.

    We have some cracks in our fiberglass pool so it's due to be re-lined in the next few weeks.

    This would be an ideal time to add an extra inlet so that I can modify the piping to pump some of the water from the pump, up to the stoep roof, through a series of irrigation pipe coils, and back to the new inlet.

    As an alternative, I have a slope the other side of the pool ( east facing ) that gets sunlight from sunrise until past noon. I could have an inlet ( top of pool below water level ) and outlet ( bottom of pool ) installed and extend these to a solar heating panel/s sitting on the bank. This would then use natural convection ( thermosiphon ) to take colder water from the bottom of the pool and heat, rise and back into the top of the pool.

    The advantage that I see with this is that it would have no effect whatsoever on the pump / filter system, no additional load on the pump, and no effect on the natural circulation in the pool.

    The slope is sufficient to position a large panel where the top and bottom would be at the same levels as the new inlet / outlet.

    But would it be as effective as the stoep roof coils ?
    Watching the ships passing by.

  2. #2
    Diamond Member AndyD's Avatar
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    Jan 2010
    Cape Town
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    The only thermosyphon system I worked on was very sensitive to small amounts of air in the system which stopped it from working until it was re-bled. They work on paper a lot easier than in practice, pipework and panel layout is critical. If I was attempting another similar project I would probably opt for a small (possibly solar powered) pump.
    I am special and so is Vanash.

  3. #3
    Diamond Member wynn's Avatar
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    east london
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    Be aware that if your system is not set up properly you may even pump cool water at night?
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