circulator selection

Discussion in 'Vertical and Horizontal Loops' started by heatoldhome, Dec 18, 2014.

  1. Mark Custis

    Mark Custis Not soon. Industry Professional Forum Leader

    What does it do with 50/50?
     
  2. docjenser

    docjenser Well-Known Member Industry Professional Forum Leader

    yep, but you compensate for a lower reynolds number with the amount of pipe in the ground. What number are you getting?
    Reynolds goes up with higher viscosity at lower temps, when you need it most. That is good.
     
  3. docjenser

    docjenser Well-Known Member Industry Professional Forum Leader

    Then you spend much more on pumping and loose more heat transfer, keep glycol at 25%.
     
  4. dgbair

    dgbair Just a hobby Forum Leader

    I ended up going with ethanol with my system to get a half decent Reynolds number.
     
  5. heatoldhome

    heatoldhome Geo Student Forum Leader


    I'm getting a Reynolds number of 1313 with 4 800'x1" loops per gshp
    26-99 pumps 9 gpm. according to the climate master calculator.

    I'm getting a Reynolds number of 1430 with 4 800'x3/4" loops per gshp
    26-99 pumps 8 gpm. according to the climate master calculator.

    Both with 24% glycol

    They suggest a Reynolds number above 2500 is needed.

    To get the number higher I can lower glycol %
     
  6. heatoldhome

    heatoldhome Geo Student Forum Leader

    I'm not real happy about using a flammable liquid. whats all involved?
    Dangerous when your flushing?
     
  7. dgbair

    dgbair Just a hobby Forum Leader

    I was able to dilute the ethanol and fill the system from outside. The basement window is in a very convenient spot.
    Once dilute, I'm pretty sure it's fine...
     
  8. Mark Custis

    Mark Custis Not soon. Industry Professional Forum Leader

  9. dgbair

    dgbair Just a hobby Forum Leader

    I went back and skimmed that safety sheet.... it's been 5 yrs since reading that. I would say flushing MUST be done outdoors. (although they do have a lengthy list of safety rules for inside flushing) Like I said, my basement window is at a very convenient spot and doing all the filling/flushing from outside was not a issue for me.... so no BOOMs here Mark. :) It's safer once diluted, but it's still consider flammable at a 25% mixture.

    I always have to laugh at this one..... "No source of ignition within 20’ of the mixing/diluting operation, including welding and smoking." - really? welding and smoking are a ignition source..... lol
     
  10. docjenser

    docjenser Well-Known Member Industry Professional Forum Leader

    Don't worry too much. Do not sacrifice your antifreeze. You compensate for the lack of higher turbulence with the larger loop.
     
  11. heatoldhome

    heatoldhome Geo Student Forum Leader

    Thanks Doc.

    I understand now.
     
  12. AMI Contracting

    AMI Contracting A nice Van Morrison song Industry Professional Forum Leader

    Reynolds number is important to minimize loop field. Turbulent flow less important if field is generously sized.
     
    Rgausman likes this.
  13. heatoldhome

    heatoldhome Geo Student Forum Leader

    Can anyone give me a reality check?

    Running one 3 ton w2w Bosch unit on a loop field consisting of X3 800' runs of 1"
    To a short run of 1 1/4" header to 1" rubber hose to the unit.

    Attached is a climate master work sheet with the details and lengths. Just wanted to make sure I understand that 1 26-99 pump will do the job.

    I'm actually going to be using a Bosch w2w unit that list exchanger loss at a bit under 11 ft hd @ 9 gpm.
    so the total ft hd with a Bosch unit vs climate master unit should be about 4-5' less I think.

    Thanks for helping me clear this up!
     

    Attached Files:

    Last edited: Feb 5, 2015
  14. Mark Custis

    Mark Custis Not soon. Industry Professional Forum Leader

    A spread sheet beats the back of an envelope every time. Your numbers are correct.
     
    Last edited: Feb 6, 2015
  15. heatoldhome

    heatoldhome Geo Student Forum Leader

    Thanks Mark I thought I had this nailed weeks ago, but you had me questioning my methods.
     
  16. docjenser

    docjenser Well-Known Member Industry Professional Forum Leader

    Total pressure drop is around 22 ft/hd at 9 gpm, a single flow center with a 26-99 will give you actually 9.8 gpm flow.

    All good.
     
  17. heatoldhome

    heatoldhome Geo Student Forum Leader

    Thanks Doc
     
  18. Rgausman

    Rgausman Member

    Andy,

    Enjoying this thread.

    Seems like you are constraint loop field space. Not sure what your lot size is and zoning setbacks you have to deal with.

    Are you going to have enough space to stockpile the excavated soil while trenches are opened?

    5' x 7' trench profile is a lot of dirt to move and stockpile. Is your ground sand or clay?

    Another option may be going with a vertical slinky loop if your ground is stabile. Dewayne Dean has a vertical slinky loop.

    My AHJ required all piping in the ground loop exposed and pressurized before signing off to backfill.

    Another thing to think about is the impact of cutting tree roots during excavation.

    Bob G.
     
  19. heatoldhome

    heatoldhome Geo Student Forum Leader

    Hey Bob thanks for the reply.

    My local Authority doesn't have any regulations like that.

    I have plans to pressurize each loop before back fill. But I will have to back fill each loop as I go.
    I'm bringing each trail into the building with a manifold inside.

    Mostly Clay here. I thought I had plenty of room on my 1 anchor lot. But with a well, septic, house, deck, and shop. Space without trees is limited.


    I hope to keep learning! Thanks!
     
  20. urthbuoy

    urthbuoy Well-Known Member Industry Professional Forum Leader

    "Horizontal" slinky loop.

    Edit: Oh, get it. In a "vertical" profile.
     

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