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Oklahoma State University

Can GLHEPRO be used to size a standing column well?

Yes and No.  GLHEPRO V.4 can be set to approximate a standing column well (SCW) without bleed.  In many cases, the bleed, by drawing ground water through the surrounding rock, makes a significant contribution to the performance of a standing column well.   The combined heat and mass transfer in the rock cannot be directly modeled by the conduction-only model in GLHEPRO.  Some users have heuristic approximations for the effect of bleed, such as increasing the thermal conductivity.  We are not in a position to make a recommendation on this.

For using GLHEPRO V.4 to simulate or size a standing column well without bleed, the following procedure is recommended, based on the only in-hole thermal resistance that an SCW has is the convective resistance at the outer wall.

  1. Choose, under "Calculate Borehole Thermal Resistance", the concentric tube option.
  2. Set outer tube inside diameter (D2) to the actual well diameter.
  3. Set outer tube outside diameter (D1) slightly larger, say 0.1 inches larger than D2.
  4. Set borehole diameter (d) another 0.1 inches larger than D1.
  5. Change the outer pipe and grout conductivities and volumetric heat capacities to be the same as the soil.
  6. Set the inner tube dimensions and conductivities corresponding to the dip tube.
  7. Choose Option 2 to calculate the convection coefficient at the borehole wall.
  8. Press the Calculate Borehole Resistance button, then OK to return to the main screen.