modelTwoUTube

Double U-tube borehole heat exchanger

Extends from Buildings.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.BaseClasses.PartialBorehole.

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.

Components

TypeNameDefaultDescription
Buildings.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.BaseClasses.InternalHEXTwoUTube[nSeg]intHexDiscretized borehole segments

Revisions

  • May 17, 2024, by Michael Wetter:
    Updated model due to removal of parameter dynFil.
    This is for IBPSA, #1885.
  • July 2018, by Alex Laferrière:
    Following major changes to the structure of the Buildings.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.