choosing correct pump

Discussion in 'Boiler Forum' started by scm37, Aug 21, 2011.

  1. scm37

    scm37 New Member

    Messages:
    5
    Location:
    FL
    Hi,
    I was redirected to this forum by someone in the pumps tanks forum. I need to pump water from the deep end(approx 6 ft) of a swimming pool, up a pillar to the ceiling, across the ceiling and up to the 2nd floor to an HVAC unit that uses water to cool the freon in a coil. After the coil, it exits thru pipe and simply spills back to surface of pool to dissipate heat. Can anyone thell me what kind of pump I should use, I also want to use an energy efficient pump. The current configuration uses the 1.5 hp pool pump and it has to run 24/7 using too much power.!
    Thanks, Steve
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,824
    Location:
    New England
    To evaluate that, would need the following info: total lift, total gpm required, size of pipe, and, where you can place the pump. I would assume you don't want it submerged in the pool, but if there were a pit outside of the pool so priming the thing wouldn't be a problem, that would help, too.
  3. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,840
    Location:
    NW Ontario, Canada
    As for total lift, I think the suction from the water falling back down will almost cancel out the lift.
  4. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,075
    Location:
    Maine
    1/2 hp shallow well jet pump should do the trick
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,824
    Location:
    New England
    IF the loop is closed, then yes, the falling water will help the rising water. I got the impression (maybe wrong) that it essentially sprayed over the coil, went to a drain pan, and then returned, thus, there's no closed loop at least from the water's perspective.
  6. scm37

    scm37 New Member

    Messages:
    5
    Location:
    FL
    closed/open loop.

    Hi,
    Thanks for all the responses, this is great!!!. It would be considered a closep loop. I guess. The HVAC unit is built for hi-rise condo's using two separate coils built into it for water. One coil is for cold water to cool the freon for cold air. the other coil is for hot water for heat int the winter that comes from the water heater. The house pump supplies that. So, the water comes from the pool and goes back to the pool in a pipe. This system already existed when we moved in. Never saw anything like it. Previous owner was a DIY'er. The coils inside the unit are 3/4" with 3/4" lines running to it. The pool pump currently supplies water, problem is, the pool was built without a bottom drain, so the skimmer is where the pump draws the water from and then it goes back to the surface of the pool. I want to get the water from the bottom of the pool, where it is cooler. I also want to use a pump that is energy efficient.
    Thanks
  7. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,840
    Location:
    NW Ontario, Canada
    As far as I know, a submersible is twice as efficient as a jet pump. Might not suit the aesthetics though but then I don't know how you were planning to plumb in whatever pump you choose.
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