Research Article
Completely Recuperative Supercritical CO2 Recompression Brayton/Absorption Combined Power/Cooling Cycle: Performance Assessment and Optimization
Table 4
Optimal parameter selection of the decision variables for different objective cases.
| | Parameters | Base case | Optimal cases | | case | case | case |
| | TUR1 inlet temperature (K) | 823.15 | 827.33 | 867.85 | 920.41 | | TUR1 inlet pressure (MPa) | 25 | 26.51 | 25.56 | 28.20 | | TUR2 inlet pressure (MPa) | 3.5 | 3.95 | 2.97 | 2.84 | | WHE1 outlet degree of overheat (K) | 5 | 2.23 | 2.1 | 5.46 | | WHE1 pitch point difference (K) | 20 | 46.45 | 15.36 | 20.76 | | TUR2 inlet ammonia concentration | 0.79 | 0.924 | 0.917 | 0.901 | | GEN outlet temperature (K) | 130 | 137.4 | 115.6 | 116.85 | | ABS1 outlet ammonia concentration | 0.42 | 0.41 | 0.43 | 0.38 | | Split ratio | 0.418 | 0.375 | 0.205 | 0.216 | | Brayton subcycle output work (MW) | 139.05 | 156.88 | 215.10 | 249.34 | | Absorption subcycle output work (MW) | 40.79 | 43.36 | 35.80 | 39.16 | | Absorption subcycle refrigeration capacity (MW) | 142.42 | 218.89 | 210.02 | 215.17 | | Absorption subcycle mass flow rate (kg/s) | 189.47 | 211.62 | 206.91 | 215.65 | | Thermal efficiency | 68.74% | 84.79% | 82.44% | 81.41% | | Exergy efficiency | 63.18% | 67.16% | 72.35% | 72.16% | | Unit cost of the system products ($/GJ) | 11.667 | 11.016 | 9.489 | 9.456 |
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