This validation case simulates the experiment of Beier et al. (2011). Measured experimental data is taken from the reference.
The experiment consists in the injection of heat at an average rate of 1142 W in a 18 m long borehole over a period 52 h. Dimensions and thermal properties reported by Beier et al. (2011) are used in the model. The authors conducted multiple independent measurements of soil thermal conductivity. The average of reported values (2.88 W/m-K) is used here. Finally, the filling material thermal capacity and density was not reported. Values were chosen from the estimated volumetric heat capacity used by Pasquier and Marcotte (2014).
The construction of the borehole is non-conventional: the borehole is contained within an aluminum pipe that acts as the borehole wall. As this modifies the thermal resistances inside the borehole, the values evaluated by the multipole method are modified to obtain the effective borehole thermal resistance reported by Beier et al. (2011).
Beier, R.A., Smith, M.D. and Spitler, J.D. 2011. Reference data sets for vertical borehole ground heat exchanger models and thermal response test analysis. Geothermics 40: 79-85.
Pasquier, P., and Marcotte, D. 2014. Joint use of quasi-3D response model and spectral method to simulate borehole heat exchanger. Geothermics 51: 281-299.
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