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EnglishFinite element simulations performed through COMSOL Multiphysics (© COMSOL AB.) are used to study the long-term performance of BHE fields placed in a water-saturated porous soil subjected to groundwater movement. The heat transfer problem is written in a dimensionless form and the long-term time evolution of the mean surface temperature of the BHEs, sketched as cylindrical heat sources subjected to a regular time periodic heat load, is determined with reference to a single line of three BHEs and to a square field of twenty-five BHEs. A simplified model to determine the long-term performance of BHE fields, based on the superposition principle, is proposed and validated. The accuracy of the simplified model is found to be excellent for design purposes.
| Titolo: | Validation of a Simplified Model to Determine the Long-Term Performance of Borehole Heat Exchanger Fields with Groundwater Advection | |
| Autore/i: | LAZZARI, STEFANO; A. Priarone; ZANCHINI, ENZO | |
| Autore/i Unibo: | ||
| Anno: | 2011 | |
| Titolo del libro: | Proceedings of COMSOL Conference 2011 Stuttgart | |
| Pagina iniziale: | 1 | |
| Pagina finale: | 6 | |
| Abstract: | Finite element simulations performed through COMSOL Multiphysics (© COMSOL AB.) are used to study the long-term performance of BHE fields placed in a water-saturated porous soil subjected to groundwater movement. The heat transfer problem is written in a dimensionless form and the long-term time evolution of the mean surface temperature of the BHEs, sketched as cylindrical heat sources subjected to a regular time periodic heat load, is determined with reference to a single line of three BHEs and to a square field of twenty-five BHEs. A simplified model to determine the long-term performance of BHE fields, based on the superposition principle, is proposed and validated. The accuracy of the simplified model is found to be excellent for design purposes. | |
| Data prodotto definitivo in UGOV: | 10-giu-2013 | |
| Appare nelle tipologie: | 4.01 Contributo in Atti di convegno |
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