.Buildings.Fluid.Geothermal.ZonedBorefields.OneUTube

Information

This model simulates a borehole thermal energy storage system with multiple zones of single U-tube boreholes. Boreholes within the same zone are connected in parallel. The borefield configuration and thermal parameters are defined in the borFieDat record.

Heat transfer to the soil is modeled using only one borehole heat exchanger per zone. The fluid mass flow rate into each borehole is divided to reflect the per-borehole fluid mass flow rate. The borehole model calculates the dynamics within the borehole itself using an axial discretization and a resistance-capacitance network for the internal thermal resistances between the individual pipes and between each pipe and the borehole wall.

The ground thermal response at each borehole segment is evaluated using analytical thermal response factors. Spatial and temporal superposition are used to evaluate the total temperature change at each of the borehole segments.

Revisions

• February 2024, by Massimo Cimmino:
  First implementation.