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Solar Storage Tank

singh Member Posts: 866
Seems like a Phase III would be a good application for solar. Providing you don't need a second coil.

Does any one have thoughts about this?

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  • ALH_4
    ALH_4 Member Posts: 1,790

    Is this SDHW preheat? The Phase III should work great, as will any indirect with a good heat exchanger.

    I wonder if the tank-in-tank design might result in a higher return temperature to the collectors than a coil-in-tank design? Then again, it might not. I must admit, I have not watched a tank-in-tank water heater in action with a thermometer in my hand and compared it to a coil-in-tank design.
  • singh
    singh Member Posts: 866

    This would be a pre-heat for a tankless.
    Of course I'll have to put a mixing valve between the two so
    tankless would work.

    I was thinking a tank in tank would also give you better xchange? And on low producing days, the tankless would still have a lower temperature rise.

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  • ALH_4
    ALH_4 Member Posts: 1,790

    My first reaction is that a coil-in-tank would have a lower return temp to the collectors. Also the collector loop volume would be less with a coil, which I think is better for a solar heating system.

    In my opinion, it is very difficult to beat the price and quality of Crown Megastor tanks. The MS-119 is a nice design with more coil surface area than a Vitocell 300, and the MS-80 and 119 are also available in a dual coil.
  • hot_rod
    hot_rod Member Posts: 22,144
    Check out the Viessmann tanks

    in the new "Green" section here. Under Solar Technology file. Thanks to Terry and Viessmann for providing all that solar lit. There is a gold mine of info in those docs!

    Notice how a stratification tank is built their 353 model.

    Also that rather unique 050 tank that has a smaller DHW indirect tank inside the large tank to eliminate potential DHW stagnation in the large vessel. Very clever!

    I'd like to see a Phase 3 tank with additional taps mid way up. Then you could use that stacking principal and possibly dual heat inputs. Upper for boiler lower for solar.

    I may have to strip a phase 3 down and do some drilling and welding :) The large amount of surface area in a tank in tank style should be a plus. Seems like a less expensive method as opposed to hundreds of feet of coil?

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Weezbo
    Weezbo Member Posts: 6,232
    i saved some pics from a link in one of the readings...

    i was sorta thinking...'hey! Hot Rod would dig this!

    it is linked through aee-intec translate page google it wont copy and paste from my favorites list :(..lets see if i can find the pic which leads to the pic you would definitely dig :)way sharp projects ...plenty of reading material and pictures to clarify them...cha ekit Out :)

    it is bolted up to an Array of storage tanks...Nice :)
  • Mad Dog_2
    Mad Dog_2 Member Posts: 6,934
    solid question...and one that I am mulling over

    as I start my solar driveway. Mad Dog

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This discussion has been closed.