Comparative analysis of water and carbon dioxide injection for the thermohydraulics of an EGS project in Dikili Geothermal Field, Türkiye

Dikili Jeotermal Sahası’ndaki bir EGS projesinde su ve karbondioksit basılmasının termohidrolik açıdan karşılaştırmalı analizi, Türkiye

Indexed In

Volume 171 / 2023

Authors

Ali Cemal BENİM, Aydın ÇİÇEK

Keywords

EGS, Thermohydraulics, Computational Analysis, Supercritical Carbon Dioxide

Abstract

A comparative numerical analysis of the thermohydraulics of an enhanced geothermal system (EGS) project in Türkiye in Dikili area is presented. The fractured granodiorite is modelled as porous media, utilizing the numerically suggested data of other authors for the corresponding hydraulic characteristics. As the heat transmission fluid, two different mediums are alternatively considered. These are the more classical medium, water and the supercritical carbon dioxide (sCO2). Transient calculations are performed for a time period of twenty years, comparing the temporally developing results obtained for water and sCO2 with each other. Based on modeling parameters and assumptions, higher production temperatures are observed with sCO2, in comparison to water, implying an advantage for sCO2 usage as a working fluid in EGS. This is accompanied by the further advantage of a lower pressure drop for sCO2. On the other hand, the temperature advantage is relativized by the lower specific heat capacity of sCO2 causing a decrease in the production thermal power. In general, the present results are found to be encouraging for a further and more detailed analysis of the employment of sCO2 as working fluid in EGS.

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