Date of Award
Fall 2009
Project Type
Thesis
Program or Major
Earth Sciences: Hydrology
Degree Name
Master of Science
First Advisor
J Matthew Davis
Abstract
This research investigates thermal properties of fractured bedrock for the purpose of better understanding the sustainability of standing column well (SCW) geothermal heating systems. The three objectives are to quantify effective thermal conductivity and heat capacity of the fracture network; measure heat exchange between the fluid and the fractured surfaces; and estimate time of thermal breakthrough into a pumping well. Single and dipole well tests are performed to meet these objectives. Single well data is compared with an analytical heat flow model to estimate thermal conductivity and heat capacity. Dipole well data is compared to a model of the Kolditz (1995) modification of Gringarten and Sauty's (1975) thermal breakthrough curve. Thermal conductivity is estimated to be lower than the previously reported value by Roy et al. (1968). No thermal breakthrough is observed during the dipole test, however, modeling of theoretical SCW systems shows significant temperature changes over the long term.
Recommended Citation
McKone, Sarah B., "Thermal exchange processes within shallow fractured bedrock: Applications for standing column wells" (2009). Master's Theses and Capstones. 489.
https://scholars.unh.edu/thesis/489