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nee drule of thumb...

Kal Row
Kal Row Member Posts: 1,520
in THE MAIN WALL
quick calc of btus per hour, imparted per foot of copper pipe, immersed in a pool,

flows: 4ft per sec,
pipe sizes: from .5" to 1.5",
supply temps: from 140f to 180f

assume K pipe

thanks

Comments

  • hr
    hr Member Posts: 6,106
    You would need

    to know the pool temperature. The delta t between the copper pipe at an average of 160F to what temperature water?

    Also is the pool water circulating or still water?

    hot rod

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  • Kal Row
    Kal Row Member Posts: 1,520
    going from 40 to 100...

    starting with 40f street water and going to 100F trying to impart 500kbtu per hour to stationary water (except for convection) how much lets say 1" copper tube would I need, with 180f boiler supply and a 0011 driving it at 20gpm 9ft head? don’t care about deltaT as the boilers are condensing and can handle 50f return water, so for e.g., with a deltaT of 130, I could technically leave behind 130kbtu for every 1gpm, for a total 2.6million btu per hr if I had the heat transfer surface!!!

    I have a formula but it's huge and needs renolds numbers and whatnot, looking for something quick'n'dirty even if it's off by 10% . It's a zone off, 4 Lochinvar knight 399 modcon boilers, with a 4" Caleffi hydro isolator, low-loss header, the works, the pool has a tekmar 162-tn4 setpoint controller, so I am not worried about efficiency - but rather enough transfer surface

    Cant even get a straight answer from people that make flat, quilted stainless exchangers from this purpose, for their own products, is this rocket science??? There’s got to be some hard experience out there.
  • hr
    hr Member Posts: 6,106
    If you

    look at the data on indirect DHW tanks they usually show the surface transfer area of the coils. The Triangle tube TR60 has 28 square feet.

    Also Triangle Tube has a HX selection table for their pool exchangers with square footage sizes. That should be online or fax-able.

    hot rod

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  • Dave_4
    Dave_4 Member Posts: 1,405
    dough!! - i should have thought of that - thanks

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