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Table 3 Thermodynamic properties of the single flash geothermal power plant combined with the trans-critical CO2 cycle
Points | Working fluid | Temperature (°C) | Pressure (KPa) | Enthalpy (kJ/kg) | Entropy (kJ/kg K) | Mass flow rate (kg/s) | Quality | Exergy (kW) |
|---|---|---|---|---|---|---|---|---|
1 | Geo-fluid | 170 | 900 | 719.3 | 2.042 | 10 | – | 1236 |
2 | Geo-fluid | 151.9 | 500 | 719.3 | 2.047 | 10 | 0.03742 | 1223 |
3 | Geo-fluid | 151.9 | 500 | 2749 | 6.821 | 0.3742 | 1 | 281.7 |
4 | Geo-fluid | 151.9 | 500 | 640.4 | 1.861 | 9.626 | 0 | 941.1 |
5 | Geo-Fluid | 60.07 | 20 | 2348 | 7.122 | 0.3742 | 0.8891 | 98.55 |
5b | Geo-fluid | 60.07 | 20 | 1910 | 5.81 | 0.3742 | 0.7036 | 78.8 |
6 | Geo-fluid | 60.07 | 20 | 251.5 | 0.8321 | 0.3742 | 0 | 3.863 |
7 | Geo-fluid | 60.13 | 500 | 252.1 | 0.8326 | 0.3742 | – | 4.053 |
8 | Geo-fluid | 72.1 | 500 | 302.2 | 0.9802 | 9.626 | – | 169.9 |
9 | Carbon dioxide | 52.1 | 15,000 | − 186.3 | − 1.383 | 17.2 | – | 3784 |
9b | Carbon dioxide | 55.7 | 15,000 | − 176.8 | − 1.354 | 17.2 | – | 3829 |
10 | Carbon dioxide | 131.9 | 15,000 | 12.53 | -0.8275 | 17.2 | – | 4403 |
11 | Carbon dioxide | 72.72 | 7214 | − 18.03 | − 0.8052 | 17.2 | – | 3765 |
12 | Carbon dioxide | 30 | 7214 | − 202.2 | − 1.395 | 17.2 | 0 | 3572 |
13 | Geo-fluid | 71.65 | 500 | 300.3 | 0.9748 | 10 | – | 173.7 |