Evacuated tube system design

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  • Mikeeisele
    Junior Member
    • Oct 2017
    • 1

    Evacuated tube system design

    I have pick up a client that purchase a Evacuated tube collector system, w. 120HE tank, and 12 gallon DB res, this system came with 3x30 tube manifold panels, this system is to be install in Tucson, AZ… not the correct climate I know…but its what I have to work with, I have 13 yrs in solar thermal, mostly sunearth 8040 glycol, some DB but the systems I have installed I haven't had to engineer flow, thermal gain for stag avoidance,.. That's what I need help with,

    Add'l specs Hot water for 12 - 2 bed, 2 bath units, my thoughts are that the 120 won't have enough hot water for peak use, thinking about adding a 75 gas, use the solar a preheat, And possible a second 120 for add'l solar storage.

    the other ? is collectors in series or parallel? I like series in the winter and parallel in the summer. I'm concerned about overheating in series in the summer…

    let me know your thoughts

    Mike Tucson, AZ
  • LucMan
    Solar Fanatic
    • Jul 2010
    • 626

    #2
    3x30 should be good for 240+ gallons so go ahead and add an additional 120 g storage tank. You are definitely going to need a commercial gas water heater for a 12 unit building most likely a 120 gallon or a Laars commercial.
    Pipe in in parallel.
    It's a drain back system so you shouldn't have a problem with overheating and stagnation. Hopefully they are good quality evac. tubes they are going to get HOT in the Arizona sun.

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