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Thread: Evacuated tube thermal solar

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    Evacuated tube thermal solar

    Hello, Im hooking up 3 panels. 5' x 8' of evacuated tubes for my panel. There are being located on the roof of a building housing the pump, filter, etc. for an inground pool that is 35' x 14' freeform style. My question is related to the piping specifically. Will I need a vacuum breaker or a vent at the top of the panel piping on the return or supply. I am assuming i need to drain these panels when the pump is off to avoid boiling the water off , etc. I will pipe them so they can gravity drain back on the return side but just need some proven advise. I plan to add a check valve on the supply side after the pump to the panels. I dont have an automatic 3 way valve at this point, just planning on open and closing valves to panels and playing with the bypass valve for proper flow over panels. So, my biggest question is just regarding a needed vacuum breaker or vent? I live in southern ontario, canada. My pool is a salt water, fibreglass inground pool. Filter is a cartridge filter with a pentair 1hp pump. All piping is 1 1/2" pvc shed 40 pipe within the pump and filter now. Thks for any help
    20x49 double roman 3.5' to 8.5 deep', 44,000 gal. SWG, TF-100 test kit, concrete walls with vinyl liner, cartridge filter on an IG pool with a 1hp main pump and 1.5hp booster pump. Pool built April 2013

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    duraleigh's Avatar
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    Re: Evacuated tube thermal solar

    Welcome to the forum. YOur thinking is correct. Most all good solar installations use a vacuum breaker.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JasonLion's Avatar
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    Re: Evacuated tube thermal solar

    Welcome to TFP!

    You typically put a vacuum breaker on the supply line. You should not put a check valve on the supply line, instead put the check valve between the filter and the point where the solar supply and bypass lines split off from each other. Then put a second check valve on the solar return line near the bottom. That will allow the panels to drain when the pump is off and prevent them from pressurizing when solar is turned off and the pump is on.
    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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    Re: Evacuated tube thermal solar

    Thks for the quick replies. OK. I'll pipe it and give it a try. Should the vacuum breaker be of any type or manufacturer. Plastic? Steel?
    20x49 double roman 3.5' to 8.5 deep', 44,000 gal. SWG, TF-100 test kit, concrete walls with vinyl liner, cartridge filter on an IG pool with a 1hp main pump and 1.5hp booster pump. Pool built April 2013

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