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in floor loop lenths

Terry
Terry Member Posts: 186
in THE MAIN WALL
I'd go 4-250ft coils (1000ft total), allows you to go 6" on centre @ perimeter & 6" o/c for a few runs infront of overhead doors.

headloss on 250feet 1/2" nominal. (about 4 psi assuming 1gpm per loop) (4 loops, 4 gpm, 40000 btu)

Terry

Comments

  • vince alberson sr
    vince alberson sr Member Posts: 1
    in floor loop lenths

    i have a garage floor that needs 900ft of tubing .is it better to have 3 300ft loops or 9 100ft loops
  • Wayco Wayne
    Wayco Wayne Member Posts: 615
    What

    dianeter pipe are you using? 1/2 inch pex can be run in 300 foot lengths with no problems.

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  • Daniel Paul_2
    Daniel Paul_2 Member Posts: 20
    Head Loss

    The answer to this question would be found in your heat loss. The one thing that would help determine this would be the head loss per loop and total head loss. If with three loops, the head loss is so high that your going to need some monster pump, than you would want to start trying more circuits until the head loss is within reason. The 300 feet per loop for 1/2inch is a rule of thumb, you still need to do your homework.
    Hope this helps

    Danny
  • Donny
    Donny Member Posts: 37
    heat loss essential!

    I agree with Danny, but I would use 4 - 225' loops' floor will be a more consistant temp
  • heatboy
    heatboy Member Posts: 1,468
    Depends ;-)

    We, including myself, throw a lot of numbers around when it comes to loop lengths for various tube sizes. The RPA has established guidelines about this, also. What it really comes down to is how much water do I need to flow? For that, the heat loss of the structure should be known. You mentioned you need 900’ of tube. How do you know? If the heat loss is 20MBH, you could easily do three 5/8” loops of 350’ without a very large pressure drop. In concrete slabs, I like to do 5/8” because they usually consist of wide open runs with very few workarounds. 12” to 15” centers are normal, depending. To get the same pressure drop with ½”, you would have to 4 circuits of 225’. More work and money for no gain. BTW, what is the heat loss?

    hb


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