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Thermodynamic Cycles using Carbon Dioxide

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Thermodynamic Cycles using Carbon Dioxide ( thermodynamic-cycles-using-carbon-dioxide )

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14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 Q_water T_w_in T_w_out T_co2 180.0 160.0 140.0 120.0 100.0 80.0 60.0 40.0 20.0 0.0 Q_water (kW) Temperature (°C) 5 7 9 11 13 15 17 Time Figure 3‐19 Daily performance of the solar‐ driven carbon dioxide power system during a summer day in Stockholm (at 120 bar gas heater pressure) As shown in the figures, the temperature of the supercritical carbon dioxide varies with time and has a peak value (about 170 °C) around 13:00, when the system net power production also reaches its maximum (about 1.5 kW). The average system thermal efficiency during the system working period is about 9% and the average power production is consequently about 1.2 kW. Besides the period when the system is working under power mode, the system also works under the heating mode in the early morning (6:00 to 8:00). The sudden change of water temperature (around 8:00) is due to the shift between different working modes and the difference in cooling water flow rates in different working modes. This can be further adjusted by optimizing the cooling water flow rates in different working modes. During the system working period, the system reaches its peak capacity around 13:00 and its peak capacity is around 12 kW. Figure 3‐20 to Figure 3‐23 show the daily and monthly performance of the solar driven carbon dioxide power system for power and hot water productions for an entire year. 43

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