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Thread: Heat Loss in Solar Heat Exchanger

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    Join Date
    Mar 2015
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    groveland, california
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    Heat Loss in Solar Heat Exchanger

    I have recently installed a solar heat array using glass vacuum tubes, a heat exchanger and a glycol circulation pump. The glycol enters the heat exchanger at 160 degrees and comes out at 115 degrees, but the water enters and exits the exchanger with little or no temperature rise. Any thoughts on how this could happen?
    20' by 50', 37K gallon pebble finish, in-ground, 2hp variable speed Jandy e-pump, Jandy cartridge filter, Cover Pools retractable pool cover

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    Mod Squad jblizzle's Avatar
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    Re: Heat Loss in Solar Heat Exchanger

    Welcome to TFP!!!

    If you are moving the water through the system quickly, it may only get a few degrees rise ... this is actually the most efficient way to heat the water.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Mar 2015
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    groveland, california
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    Re: Heat Loss in Solar Heat Exchanger

    Yes, speed of the water seems critical. I lowered the speed of the pool pump to the lowest speed, but still don't see any temperature rise.
    20' by 50', 37K gallon pebble finish, in-ground, 2hp variable speed Jandy e-pump, Jandy cartridge filter, Cover Pools retractable pool cover

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    JasonLion's Avatar
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    May 2007
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    Re: Heat Loss in Solar Heat Exchanger

    The heat has to be going somewhere. It is perfectly plausible that there could be less than a 1 degree temperature increase, which your thermometer may not be able to measure.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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