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Thermodynamic analysis of a coupled system based on total flow cycle and partially evaporated organic Rankine cycle for hot dry rock utilization

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  • Wang, Zengli
  • Shao, Hua
  • Shao, Mingcheng
  • Dai, Zeyu
  • Zhang, Rao

Abstract

The total flow cycle (TFC) has a great potential to improve efficiency of geothermal energy utilization. However, it can not fully utilize the heat source due to the limited expansion ratio of the two-phase expander. To solve the problem, a coupled system of TFC and partially evaporated organic Rankine cycle (TFC-PEORC) is proposed. The thermodynamic model considering the pinch point location migration is developed, and the effects of operating parameters on the temperature matching and system performance are investigated. On this basis, system optimization is carried out. At the same time, the performance of TFC-PEORC was compared with the single-stage TFC, the coupled system of TFC and organic Rankine cycle (TFC-ORC), the coupled system of trilateral cycle and organic Rankine cycle (TLC-ORC), and the coupled system of TFC and Kalina cycle (TFC-KC) under optimal operating conditions. The results show that the net output power of TFC-PEORC has a 14.26 % increase compared to TFC, and that TFC-PEORC can provide excellent the temperature matching of the high temperature (HT) stage and the low temperature (LT) stage working fluids, thus providing the maximum net output power (84.36 kW) that is up to 1.93 % higher than TFC-ORC.

Suggested Citation

  • Wang, Zengli & Shao, Hua & Shao, Mingcheng & Dai, Zeyu & Zhang, Rao, 2024. "Thermodynamic analysis of a coupled system based on total flow cycle and partially evaporated organic Rankine cycle for hot dry rock utilization," Renewable Energy, Elsevier, vol. 225(C).
    • Handle: RePEc:eee:renene:v:225:y:2024:i:c:s0960148124003379
    DOI: 10.1016/j.renene.2024.120272
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    References listed on IDEAS

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