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Here are some ideas:

1. Try GroundHeatExchanger:Slinky (seems more similar to the helical ground heat exchanger than the U-tube type)
2. Try to determine GroundHeatExchanger:ResponseFactors to input into Energyplus that would match the experimental data that you have.
3. Try GroundHeatExchanger:Pond since the water temperature leaving the pond heat exchanger should be roughly equal to the pond temperature. You might be able to approximate the borehole wall temperature with the pond.