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Effect of heat extraction optimization with supercritical carbon dioxide on transcritical power cycle

Hsieh, Jui‐Ching

International journal of energy research, 2020-06, Vol.44 (7), p.5806-5818 [Periódico revisado por pares]

Chichester, UK: John Wiley & Sons, Inc

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  • Título:
    Effect of heat extraction optimization with supercritical carbon dioxide on transcritical power cycle
  • Autor: Hsieh, Jui‐Ching
  • Assuntos: buoyancy ; Carbon dioxide ; enhanced geothermal system ; Fluid dynamics ; Fluid flow ; Heat ; Heat transfer ; Heat treatment ; Inlet temperature ; Optimization ; Peak values ; pressure drop ; Rankine cycle ; supercritical CO2 ; Supercritical gas extraction ; Temperature ; thermodynamic analysis ; transcritical organic Rankine cycle
  • É parte de: International journal of energy research, 2020-06, Vol.44 (7), p.5806-5818
  • Notas: Funding information
    Ministry of Science and Technology, Taiwan, Grant/Award Numbers: MOST 106‐2218‐E‐167‐002‐MY2, MOST 108‐2622‐E‐006‐017‐CC1
  • Descrição: Summary An experimental and thermodynamic analysis was conducted to explore the match in operating conditions for the heat extraction of supercritical CO2 and the CO2 transcritical organic Rankine cycle (CTORC). The results revealed that in the optimal conditions of the experiment, the difference between the pseudocritical temperature and the inlet temperature ( ΔT pc − in) was <10 K and T b/T pc (ratio of the bulk temperature to the pseudocritical temperature) was ≤1 (ideal scenario: T b/T pc = 1). Furthermore, the heat transfer and fluid flow of CO2 as well as the CTORC system performance at the optimal T b/T pc could be simultaneously improved with respect to those at ΔT pc − in < 10 K. The peak values of system efficiency for the inlet temperature of the expander of 100°C and 150°C were 5.1% at 12.5 MPa and 8.0% at 17 MPa, with the corresponding T b/T pc being 1.24 (T pc of 55.9°C) and 1.45 (T pc of 70°C), respectively. Consequently, to simultaneously improve the heat transfer, fluid flow and system efficiency, T pc of the supercritical CO2 in the CTORC should be sufficiently high to approach half the inlet temperature of the expander for obtaining an optimal T b/T pc at a low condensing temperature. An experiment and thermodynamic analysis were conducted to explore the match in operating conditions for the heat extraction of supercritical CO2 and the CO2 transcritical organic Rankine cycle (CTORC). The results revealed that to simultaneously improve the heattransfer, fluid flow, and system efficiency, the Tpc of the supercritical CO2 in the CTORC should be sufficiently high to approach half the inlet temperature of the expander for obtaining an optimal Tb/Tpcat a low condensing temperature. For figure please use Figure 10 (B) ‐ System efficiency and Tb/Tpc values at T3 values of 150°C for various evaporation pressures and a Tc value of 25°C.
  • Editor: Chichester, UK: John Wiley & Sons, Inc
  • Idioma: Inglês
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