.BuildingSystems.Fluid.Geothermal.Aquifer.Validation.SimulationTest

Information

This validation case simulates an idealized operation of an aquifer thermal storage system. Results are compared with simulations from a test suite developed by Mindel et al. (2021). This test suite comprises a set of cases to assess the thermo-hydraulic modelling capabilities of various geothermal simulators.

The comparison was carried out with respect to the test case called TC2 - well-test comparison. The main goal of TC2 is to compare aquifer temperatures under a typical operation of an ATES system consisting of injection, falloff, drawdown, and build-up. The injection phase represents the charging period, while the drawdown phase represents the discharge period. Intermediate phases of falloff and build-up represent periods of storage or inactivity. The overall operational period is one year, and the sequence of the different phases is the following:

• Injection: Water is pumped at Q = 0.001 m³ s^-1 and T_inj = 120C for 120 days.
• Falloff: Well is shut-in, Q = 0 m³ s^-1 for 60 days.
• Drawdown: Water is pumped at Q = -0.001 m³ s^-1 for 120 days.
• Build-up phase: Well is shut-in, at Q = 0 m³ s^-1 for 65.25.

References

Julian E. Mindel, Peter Alt-Epping, Antoine Armandine Les Landes, Stijn Beernink, Daniel T. Birdsell, Martin Bloemendal, Virginie Hamm, Simon Lopez, Charles Maragna, Carsten M. Nielsen, Sebastia Olivella, Marc Perreaux, Maarten W. Saaltink, Martin O. Saar, Daniela Van den Heuvel, Ruben Vidal, Thomas Driesner, Benchmark study of simulators for thermo-hydraulic modelling of low enthalpy geothermal processes, Geothermics, Volume 96, 2021, 102130, ISSN 0375-6505, https://doi.org/10.1016/j.geothermics.2021.102130.

Contents

Name	Description
Medium	Medium model

Revisions

• May 2023, by Alessandro Maccarini:
  First Implementation.