BuildingSystems.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.TwoUTube

# .BuildingSystems.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.TwoUTube

Double U-tube borehole heat exchanger

## Information

Model of a double U-tube borehole heat exchanger. The borehole heat exchanger is vertically discretized into nseg elements of height h=hBor⁄nseg. Each segment contains a model for the heat transfer in the borehole, with a uniform borehole wall boundary temperature given by the `port_wall` port.

The heat transfer in the borehole is computed using a convective heat transfer coefficient that depends on the fluid velocity, a heat resistance between each pair of pipes, and a heat resistance between the pipes and the borehole wall. The heat capacity of the fluid and the heat capacity of the grout are taken into account. The vertical heat flow is assumed to be zero.

## Revisions

- July 2018, by Alex Laferrière:
  Following major changes to the structure of the BuildingSystems.Fluid.HeatExchangers.Ground package, the documentation has been changed to reflect the new role of this model. Additionally, this model now extends a partial borehole model.
- July 2014, by Damien Picard:
  First implementation.

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