GPM,LWT and EWT correlation?

Discussion in 'Open Loop' started by clockwalk, Dec 12, 2010.

  1. clockwalk

    clockwalk New Member

    My system requires 1.5 to 2 GPM per ton. Will more GPM mean more or less efficiency this winter? I can adjust the flow up to 16 GPM but is this helpful or less efficient? How much difference should I see between EWT and LWT? Is 7 degrees a good working number?
    System is WF Envision 049 4 ton water to air in open loop using my existing well. Location is in RI.

    Thanks in advance,
  2. Palace GeoThermal

    Palace GeoThermal Well-Known Member Industry Professional Forum Leader

    Increasing GPM above the recommended flow does nothing to add to efficiency.

    A 5 - 10° delta T between EWT and LWT is what we shoot for.
  3. engineer

    engineer Well-Known Member Industry Professional Forum Leader

    Depending on well pump power and efficiency, it may be MORE efficient to have lower GPM per ton.
  4. AMI Contracting

    AMI Contracting A nice Van Morrison song Industry Professional Forum Leader

    An eroded coax can be an unfortunate off-shoot of extremely high GPM.

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