The experimental study of heat extraction of supercritical CO₂ in the geothermal reservoir

¹ Institute of Mechatronic System Engineering, National University of Tainan, No. 33, Sec. 2, Shu-lin St., Tainan City 700, Taiwan (R.O.C.)
² Industrial Technology Research Institute, Green Energy and Environment Research Laboratories, No.195, Sec. 4, Chung Hsing Rd., Chutung, Hsinchu, 31040, Taiwan (R.O.C.)
³ Department of Greenergy, National University of Tainan, No. 33, Sec. 2, Shu-lin St., Tainan City 700, Taiwan (R.O.C.)
⁴ Department of Mechanical and Electromechanical Engineering, National Ilan University, No.1, Sec. 1, Shen-Lung Rd., I-LanCity 260, Taiwan (R.O.C.)

Abstract

The heat transfer phenomena of supercritical CO₂ are experimentally investigated in a horizontal tube for improving the efficiency of CO₂-EGS.This study discuss the experimental verification of the numerical simulations. The experiment is conducted for the pressure, the flow rate, and particle size 1.54mm. In addition, the experiment and simulation that the maximum heat extraction is occurred at the 9MPa pressure and mass flow rate of 0.00109 kg/s. The maximum specific heat extraction at 9MPa and flow rate of 0.00082 kg/s. The results show that the numerical model has been experimentally verified of the feasibility. Furthermore, the pseudo-critical point had a significant influence on the heat extraction, temperature difference and specific heat extraction.