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MONOFLOW GPM

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smklin
smklin Member Posts: 69
in THE MAIN WALL
How many gpm does a monflow system require . Have a system that has about 385 feet of baseboard 7 unit appartment . 6 zones per unit.

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  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,033
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    If your baseboard

    output is 500 BTU/foot and you design for a 20 degree temperature drop, that's an output of 192,500 BTU with a flow rate of 19.25 GPM.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • pipeking
    pipeking Member Posts: 252
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    smklin read this>>>

    http://www.heatinghelp.com/article/343/Circulators/187/How-to-Size-Circulators
  • JStar
    JStar Member Posts: 2,752
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    Gpm

    Depends on the heat loss and required BTUH's.
  • Paul48
    Paul48 Member Posts: 4,469
    edited February 2013
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    Really?

    42 zones and 385 ft of baseboard? Monoflo?
  • Gordan
    Gordan Member Posts: 891
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    There may be more to it than temperature drop

    Such as, min and max flow through the venturi tees in order for them to work properly. I remember seeing discussions about this but I didn't retain what it was.
  • icesailor
    icesailor Member Posts: 7,265
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    Main Size:

    Which probably needs a 2" main size unless or until you branch off to individual circuits to the separate units.
  • smklin
    smklin Member Posts: 69
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    FLOW

    That is what i thought to ask .What is the flow to make the venture tee's work. Have a lot of air problems. Thanks to all.
  • icesailor
    icesailor Member Posts: 7,265
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    Flow:

    Sounds like it is time for a big ECM circulator?
  • pipeking
    pipeking Member Posts: 252
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    PAUL

    i was thinking the same thing!
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,543
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    There's a lot to this.

    This is from the Library: http://www.heatinghelp.com/files/articles/955/281.pdf



    Read up on it before you do anything else.
    Retired and loving it.
  • CMadatMe
    CMadatMe Member Posts: 3,086
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    Gotta Love

    Those all books..Saved that one to the files..Thanks Mr. H. Will have to get together next month at the amusement park.

    There was an error rendering this rich post.

  • Paul48
    Paul48 Member Posts: 4,469
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    smklin

    I am interested in how this was zoned. Could you make a simple drawing of one zone and post it?
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,543
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    Lots of good stuff in that Library.

    It pays to wander off the Wall. ;-)
    Retired and loving it.
  • SWEI
    SWEI Member Posts: 7,356
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    B&G Handbook

    I got so much out of it that I actually bought a 1949 hard copy on eBay.  If you're patient, they can be had for under $10 shipped.



    Thanks, Dan!
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,543
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    That book

    is how I first learned about hydronics. I went to work for the rep. They say me down with that book and said, "Read."



    It was good advice. I've been reading ever since.
    Retired and loving it.
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