Solar geyser efficiency - Page 2





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  1. #21
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    Default Re: Solar geyser efficiency

    I am still looking for a geyser that has decent insulation.
    They say they will all lose x degrees temperature overnight.
    The manufacturers won't provide decent insulation because 'it will price them out of the market'..

  2. #22
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    Default Re: Solar geyser efficiency

    Quote Originally Posted by Richard Mackay View Post
    I am still looking for a geyser that has decent insulation.
    They say they will all lose x degrees temperature overnight.
    The manufacturers won't provide decent insulation because 'it will price them out of the market'..
    Geysers themselves are actually quite well insulated. Put your hand on a "hot" geyser and it's relatively cool. The bigger problem are the pipes running to and from the geyser. And they are quite difficult to insulate 100%.

    The other bigger problem is thermal syphoning if your geyser is lower than your solar collector.
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  4. #23
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    Default Re: Solar geyser efficiency

    Energy storage is the big challenge we are facing from EVs through to RE.
    So my thinking is that if you can store energy then that's great.
    Heat is a form of energy so if you can successfully store heat then you are storing energy (although I'm unaware of this being done anywhere).
    The challenge I would like to achieve is to provide enough hot water from a solar system so that my geyser (normally) never needs a backup power source.

  5. #24
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    Default Re: Solar geyser efficiency

    As pointed out by the previous writers.......Sounds like you have a thermal siphoning problem.

    Allow me to add a sketch to the discussion

    The circulation piping , both in an out, must pass below the geyser's lowest point ideally by a few hundred millimetres ( ~300 mm).

    Think about the hot water as air bubbles in a tank. It must be impossible for the bubbles to freely flow back up to the solar panel.
    Name:  Thermal syphon.png
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    Last edited by vlakkie; 2019/06/24 at 11:29 PM.
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  7. #25
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    Default Re: Solar geyser efficiency

    Quote Originally Posted by Banjo View Post
    With my setup with the arduino it is just a line or two of code to circlate water at freezing conditions, 1 temp probe measure the outside temp already
    Can you explain more about the ardino setup please.

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