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Processes 2020, 8, 216 19 of 23 Processes 2020, 8, x FOR PEER REVIEW 19 of 23 Figure 25. Thermal efficiency and exhaust heat recovery ratios for various S-CO2 cycle layouts. Figure 25. Thermal efficiency and exhaust heat recovery ratios for various S-CO2 cycle layouts. In the four S-CO2 cycle layouts, the recompression cycle and split expansion cycle can achieve In the four S-CO2 cycle layouts, the recompression cycle and split expansion cycle can achieve the highest thermal efficiency of 43.21% and the lowest thermal efficiency of 32.99%, respectively. the highest thermal efficiency of 43.21% and the lowest thermal efficiency of 32.99%, respectively. However, the exhaust heat recovery ratios for various S-CO2 cycle layouts are inconsistent with the However, the exhaust heat recovery ratios for various S-CO2 cycle layouts are inconsistent with the thermal efficiency. The split expansion cycle and recuperation cycle can achieve the highest recovery thermal efficiency. The split expansion cycle and recuperation cycle can achieve the highest recovery ratio of 24.75% and the lowest recovery ratio of 18.09%, respectively. The results indicate that the ratio of 24.75% and the lowest recovery ratio of 18.09%, respectively. The results indicate that the split expansion S-CO2 cycle is the best layout for recovery of the internal combustion engine (ICE) split expansion S-CO2 cycle is the best layout for recovery of the internal combustion engine (ICE) exhaust energy, which is inconsistent with the conclusion given by Ahn et al. [10] and Fahad et al. [13]. exhaust energy, which is inconsistent with the conclusion given by Ahn et al. [10] and Fahad et al. The reason is that the optimal layout for obtaining the maximum power from the waste heat is different [13]. The reason is that the optimal layout for obtaining the maximum power from the waste heat is from the layout for obtaining the maximum power from the high temperature heat source. It is more different from the layout for obtaining the maximum power from the high temperature heat source. important to maximize the net output power than the thermal efficiency for waste heat recovery, which It is more important to maximize the net output power than the thermal efficiency for waste heat is proved by Mohagheghi [15]. recovery, which is proved by Mohagheghi [15]. The output power of the ICE is 235.8 kW. Combined with the ICE and waste heat recovery, The output power of the ICE is 235.8 kW. Combined with the ICE and waste heat recovery, the the output power of the recuperation, pre-compression, split-flow recompression and expansion S-CO2 output power of the recuperation, pre-compression, split-flow recompression and expansion S-CO2 cycles are 262.2 kW, 263.5 kW, 262.4 kW and 271.9 kW, respectively, which are shown in Figure 26. cycles are 262.2 kW, 263.5 kW, 262.4 kW and 271.9 kW, respectively, which are shown in Figure 26. The total output power of the ICE system cycle increases 15.3% when the split expansion S-CO2 cycle The total output power of the ICE system cycle increases 15.3% when the split expansion S-CO2 cycle is used to recover the waste heat. is used to recover the waste heat.PDF Image | Supercritical CO2 Cycle for ICE Waste Heat Recovery
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