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Thread: Solar water heating

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    Sep 2013
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    Solar water heating

    Guys - I'd appreciate a bit of guidance on my heating system. The pool water circulates to the roof where it's heated in those black panels. The system is about 9 years old and it's been very effective. Just recently however we've begun to hear water dripping and gurgling constantly while the system is off. Is this a problem? Any idea what it might be?

    Thanks
    1) 14,000 gals
    2) DE filter
    3) In ground
    4) concrete
    5) Flow rate of filter; 120

    Location - San Diego, California

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    Mod Squad jblizzle's Avatar
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    Re: Solar water heating

    The panels are designed to drain when the pump is off. There is a vacuum release valve that allows air in and the system to drain. Some noise is not uncommon, although odd that it just started. Wonder if maybe the vrv is not allowing the system to drain as easily as before and thus more noise?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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  3. Back To Top    #3

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    Re: Solar water heating

    Yes it definitely just started doing this. Any idea where this valve is likely to be or what it looks like?
    1) 14,000 gals
    2) DE filter
    3) In ground
    4) concrete
    5) Flow rate of filter; 120

    Location - San Diego, California

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
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    Re: Solar water heating

    Often the vrv is at the very highest point, but that is not always true. They look like a short pipe that screws in and has some holes at the top.

    I am not sure how you could tell if there is a problem with it. Also not really sure there is a problem. Both my houses with solar have made noise when draining.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    mas985's Avatar
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    Re: Solar water heating

    Here are a few pictures. These can usually be seen fairly easy:



    However, this type goes in the end of the panel header and can't be seen very easily from the ground:

    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Surf Hawk's Avatar
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    Re: Solar water heating

    Hi, I am a newbie too, but does your system make a gurgling, trickling sound when it is on also? I discovered our solar system makes a lot of funny noises when the filter pressure rises. When I backflush, all noises go away. I attribute it to lower flow from higher pressure but maybe I'm wrong. Since this happens even when it is off, this probably isn't your problem.
    22,000 gallon IG; plaster; 16x32 Rectangular, Depth 3.5-8Ft.
    Hayward Pro-Grid DE Filter - 48sqft w/ cellulose fiber & Hayward Energy Flo RS Pump - .75HP (1.85SF)
    Very old 312sqft solar system, TFT-100 Kit with Speedstir

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    Mod Squad jblizzle's Avatar
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    Re: Solar water heating

    If the filter is dirty, that will reduce the flow and pressure to the panels. If the pressure is too low at the vrv, then it may not close and could be gurgling and pulling in air.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  8. Back To Top    #8

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    Re: Solar water heating

    Thanks guys, I really appreciate the help. On closer inspection it appears the noise isn't water dropping form high levels, it's air bubbles percolating up through the system. I guess I have a leak somewhere. I'm going to give the filter a good clean and inspect everything. I'll report back

    Thanks
    1) 14,000 gals
    2) DE filter
    3) In ground
    4) concrete
    5) Flow rate of filter; 120

    Location - San Diego, California

  9. Back To Top    #9
    linen's Avatar
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    Twin Cities, MN
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    Re: Solar water heating

    If you are getting air in the system, it will be on the suction side (before the pump impeller). Common causes are, low pool volume or stuck skimmer weir causing air to be sucked in at skimmer, leaking pump basket gasket, leaking pump drain plug, leaking suction side valves/fittings. See this pool school article for help on leaks: http://www.troublefreepool.com/pool-...leak_detection
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  10. Back To Top    #10

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    Re: Solar water heating (SOLVED)

    It appears that my filter wasn't working properly. A few of the grids were broken and it needed a good clean. So now the pressure is good and the gurgling noises have disappeared. Thanks everyone
    1) 14,000 gals
    2) DE filter
    3) In ground
    4) concrete
    5) Flow rate of filter; 120

    Location - San Diego, California

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