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Energies 2020, 13, 2259 17 of 24 The results allow for identifying that the RHR is one of the components that presents greater environmental impacts due to their heat transfer area in comparison with the rest of the components of the system. Also, the RHR presents the greatest exergy destroyed, with values of 46% (cyclohexane), 32% (toluene), and 32% (acetone). The masses in the different phases of the life cycle of the Brayton S-CO2-ORC system are presented in Table 3. The LCA methodology was developed to obtain the environmental impacts of each component of the system under the three phases of the lifetime, which are the construction, operation and decommissioning, as shown in Table 4, selecting steel as the material. Table A1 shows the results when copper is proposed as the construction material for the devices. Table 3. Organic fluids and thermal oil masses in each life cycle phase. Fluid Cyclohexane Toluene Acetone Thermal Oil Construction 151.2078 144.4687 164.3074 184.4000 LCA Phase Operation 15.1208 14.4469 16.4307 18.44 Decommissioning 4.0826 3.9007 4.4363 4.9788 Table 4. Results of Life Cycle Assessment for each component selecting steel as the material. Organic Equipment Material w Fluid [mPts/kg] Quality Yco Yom Yde [kg] [mPts] [mPts] [mPts] Y [mPts] 133,086 28,100 15,088 264,423 23,496 226,893 321,518 80,176 266,973 Cyclohexane ITC1 ITC2 ITC3 RHR HTR T1 T2 T3 C1 P1 P2 Thermal Oil Fluid ITC1 ITC2 ITC3 RHR HTR T1 Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel 86 86 86 86 86 86 86 86 86 86 86 46,467 1407 297 159 2795 248 2398 3399 848 2822 127,037 0 26,823 0 14,402 0 252,404 0 22,428 0 216,579 0 306,903 0 76,531 0 254,838 0 6049 1277 686 12,019 1068 10,313 14,614 3644 12,135 Toluene T2 T3 C1 P1 P2 Thermal Oil Fluid ITC1 ITC2 ITC3 RHR HTR T1 Acetone T2 T3 C1 P1 P2 Thermal Oil Fluid Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel Therminol Toluene Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel Therminol Acetone 86 86 86 86 86 86 86 86 86 86 86 46,467 2680 86 86 86 86 86 86 86 86 86 86 86 46,467 5426 2 178 9 3 270 10 13 293 Therminol Cyclohexane 2639 184 151 1407 267 136 2795 248 2398 3399 810 2822 856,8515 856,851 399,022 39,902 127,037 0 24,139 1 12,291 2 252,404 3 22,428 4 216,579 5 306,903 6 73,121 7 254,838 8 231,350 10,774 6049 1149 585 12,019 1068 10,313 14,614 3482 12,135 9,656,716 449,698 133,086 25,290 12,879 264,426 23,500 226,898 321,524 76,609 266,981 2 178 0 9 789 0 8 186 38 826 184 144 18 184 164 8,568,515 856,851 387,147 10,941 127,037 0 25,081 1 9257 2 252,404 3 22,428 4 216,579 5 306,903 6 83,162 7 254,838 8 2 178 9 231,350 10,453 6049 1194 441 12,019 1068 10,313 14,614 3960 12,135 9,656,716 408,541 133,086 26,277 9700 264,426 23,500 226,898 321,524 87,129 266,981 8 195 1407 278 103 2795 248 2398 3399 921 2822 1612 10 8,568,515 856,851 891,450 89,145 77 231,350 24,069 1699 9,656,716 1,004,664 8 195PDF Image | S-CO2 Brayton Cycle Coupled with ORC as Bottoming Cycle
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