Thermo-economic analysis of an enhanced gekothermal system for power generation based on organic Rankine cycle

Yuan Zhao, Jun Gao, Yingxia Zheng, Bo Zhu, Guanqun Luo, Yuanjun Tang and Chao Ye

International Journal of Low-Carbon Technologies, 2024, vol. 19, 842-5

Abstract: The enhanced geothermal system (EGS) has been regarded as a promising means to exploit the abundant and low-carbon hot dry rock geothermal resources. In this work, two-stage EGSs with/without one-stage recuperative cycle for power generation based on organic Rankine cycle (ORC) were proposed, and their thermo-economic performance was evaluated, comparing to the one-stage EGS-ORC. The recuperative cycle improved the thermal performance of two-stage EGS and it had the highest thermal efficiency of 16.48%. Intermediate pressure and steam extraction ratio were important parameters that impacted the thermal performance of the two-stage EGS. The higher thermal efficiency was achieved at the intermediate pressure of 0.22 MPa and steam extraction ratio of 0.1. The two-stage EGS with one-stage recuperative cycle also had the lowest levelized cost of energy (LCOE) of $0.1895 kWh−1. According to the sensitivity analysis, the temperature of hot water and prices of electricity had the greatest impact on LCOE. The LCOE could be as low as $0.1704 kWh−1 if the temperature of hot water was 165.33 C. On the other hand, if the temperature of hot water was 149.58°C, the LCOE would be increased to $0.2179 kWh−1. The results from this study could provide the possible strategies to improve the overall thermo-economic performance of EGS-ORC.

Keywords: hot dry rock; enhanced geothermal system; organic Rankine cycle; thermodynamic; economic (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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