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Supercritical CO2 Brayton cycles for solar-thermal energy

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Supercritical CO2 Brayton cycles for solar-thermal energy ( supercritical-co2-brayton-cycles-solar-thermal-energy )

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(a) 8 7.9 7.8 7.7 7.6 7.5 (c)460 440 420 400 380 360 340 320 B.D. Iverson et al. / Applied Energy 111 (2013) 957–970 961 (b)9.8 7000 7200 7400 9.5 9.4 7600 9.3 7000 7000 7200 7400 Time [s] 7000 7200 7400 7600 Time [s] Time [s] Time [s] 9.7 Turbine discharge, 6a-A Compressor inlet, 1b-A 9.6 Compressor discharge, 2a-A Turbine inlet, 5b-A 7200 7400 7600 Heater discharge, 5a (d) 0 Heater inlet, 4b -2 -4 -6 -8 7600 -10 TAC A TAC B Fig. 4. System response to 50% reduction in power setting lasting approximately 1 min and two and a half minutes. (a) Low pressure response, (b) high pressure response, (c) transient source boundary temperatures, and (d) system net power generation response (negative power indicates power production from the system). (a)7.7 7.6 7.5 7.4 7.3 7.2 4000 (c) 340 320 300 280 260 240 4000 4500 Turbine discharge, 6a-A (b)8.7 Compressor inlet, 1b-A 8.6 8.5 8.4 8.3 8.2 6000 4000 (d) 3 2 1 Compressor discharge, 2a-A Turbine inlet, 5b-A 4500 5000 5500 6000 Temperature [C] Pressure [MPa] Temperature [C] Pressure [MPa] Power [kW] Pressure [MPa] Power [kW] Pressure [MPa] 4500 5000 Time [s] 5500 0 -1 -2 -3 5000 Time [s] Heater discharge, 5a Heater inlet, 4b 5500 6000 4000 4500 5000 5500 6000 Time [s] Fig. 5. System response to 100% reduction in power setting lasting approximately 1 min and 2 min. (a) Low pressure response, (b) high pressure response, (c) transient source boundary temperatures and, (d) system net power generation response (negative power indicates power production from the system). Time [s] TAC A TAC B

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