The heat transfer phenomena of supercritical CO_2 porous flow based on the Darcy model

The purpose of this study is to obtain the heat transfer phenomena of the supercritical CO_2 in the porous medium. In this study, the transient heat transfer model conjugated with the model of Darcy's law employed by the finite element package is used to obtain the dynamic and thermal behavior in the porous medium. The validated results for the heat extraction are obtained from the comparison between the simulated results and previous study. The sensitivity parameter study under the various inlet velocities and porosities of the porous medium are discussed. The results show that the inlet velocity is the most important effect for the heat extraction. In addition, it proves that the operating conditions are important in the supercritical flow for the different tendency of the temperature difference and heat extraction. The reason is that the specific heat of the CO_2 supercritical characteristics. The heat extraction will increase as the velocity increases and the porosity decreases. The supercritical porous flow will apply on the enhanced geothermal system and high efficient waste heat recycle system.