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Technische Universität Darmstadt (2012)

Geothermal Cooling in Arid Regions : An Investigation of the Jordanian Harrat Aquifer System

Al-Zyoud, Sana’a

Titre : Geothermal Cooling in Arid Regions : An Investigation of the Jordanian Harrat Aquifer System

Auteur : Al-Zyoud, Sana’a

Université de soutenance : Technische Universität Darmstadt

Grade : Ph.D. Thesis 2012

Résumé
Besides applications of heating and power generation geothermal energy has also the potential to significantly contribute to the cooling of buildings. A shallow basaltic aquifer system in north east Jordan was studied for its potential as a geothermal resource for cooling utilization. The groundwater here is used as a geothermal medium for cooling purposes. Cold water is pumped from the reservoir using extraction wells. This water is fed into the buildings’ circuit and heat exchange occurs between the buildings ambient air and the circulating cold water. The recovered warm water is injected again into the ground using injection wells. The thermophysical properties, the mineralogical and geochemical composition of the Jordanian Harrat basalt were examined. This is followed by an assessment of the basalt’s suitability as a geothermal cooling reservoir. Representative thin sections were analyzed for their mineral components and then the results are compiled in a hydrogeothermal and a petrophysical model. Findings of this study will contribute to a better understanding of the relationship between selected petrophysical characteristics of basalt and its heat conducting abilities. A 10 % increase of opaque and ferromagnetic minerals volume proportion in the studied basalts lead to an increase thermal conductivity by approximately 0.5 W m-1 K-1. This may significantly contribute in providing a valuable alternative to direct measurements of the thermal conductivity of basalts in Jordan if sufficient mineralogical data is available. Thus, the prediction of thermal conductivity through modal mineral composition may become a key feature for efficient geothermal system exploration in volcanic and plutonic rocks. Reservoir thermophysical properties were integrated with the hydrological data to develop the numerical model. A GOCAD® 3D structural model was created. Alongside with the reservoir characteristics, this 3D model was implemented into a numerical flow and heat transport model, created with FEFLOW®. This numerical model is used to predict the performance of the geothermal cooling reservoir. Different possible geothermal installations are studied, using various approaches. The study shows that a geothermal utilization of the respective basaltic reservoir is feasible. It features sufficient hydraulic and thermal properties to be utilized for cooling purposes. The developed model has proven to be robust and flexible. It can be easily extended for analyzing other sites.

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Page publiée le 25 novembre 2013, mise à jour le 9 janvier 2019