Multiphase flow modeling and energy extraction performance for supercritical geothermal systems

Guanhong Feng, Yu Wang, Tianfu Xu, Fugang Wang and Yan Shi

Renewable Energy, 2021, vol. 173, issue C, 442-454

Abstract: Beyond the critical point of 373.946 °C and 22.064 MPa, water presents in the supercritical state, which is of great potential for geothermal resource development. In this work, an improved EoS (Equation of State) module is developed for simulation in supercritical geothermal systems based on the structure of the TOUGH2 program. Compared to previous studies, this new module provides a more elaborate description of the multiphase flow behavior. A novel method is proposed, which is more accessible and physically reasonable for the flow between sub- and supercritical conditions. Moreover, the effect of pressure and temperature on relative permeability and capillary pressure is considered, which makes it smooth and continuous around the critical point.

Keywords: Supercritical geothermal; Multiphase flow; Phase change; Code development; IDDP-2 (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:173:y:2021:i:c:p:442-454

DOI: 10.1016/j.renene.2021.03.107

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