Supercritical CO2 Cycle for ICE Waste Heat Recovery

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Supercritical CO2 Cycle for ICE Waste Heat Recovery ( supercritical-co2-cycle-ice-waste-heat-recovery )

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Compared to recuperation of the S-CO2 cycle, the highest ηt increases from 36.05% to 43.16%. The Compared to recuperation of the S-CO cycle, the highest η increases from 36.05% to 43.16%. The 2t results show that recompression of the S-CO2 cycle can improve cycle thermal efficiency observably. results show that recompression of the S-CO2 cycle can improve cycle thermal efficiency observably. On the contrary, the exhaust heat recovery ratio ηre decreases with the rising of the SR. Since On the contrary, the exhaust heat recovery ratio ηre decreases with the rising of the SR. Since split-flow recompression has negative effects on the exhaust heat recovery, it improves thermal split-flow recompression has negative effects on the exhaust heat recovery, it improves thermal efficiency. Therefore, split-flow recompression of the S-CO2 cycle is not suitable to recovery of the efficiency. Therefore, split-flow recompression of the S-CO2 cycle is not suitable to recovery of the 16 of 23 Processes 2020, 8, 216 ICE exhaust heat. ICE exhaust heat. Figure 20. Thermal efficiency and exhaust heat recovery ratios for various split ratios. Figure 20. Thermal efficiency and exhaust heat recovery ratios for various split ratios. Figure 20. Thermal efficiency and exhaust heat recovery ratios for various split ratios. Figures 21 and 22 show the thermal efficiency ηt and exhaust heat recovery ratios ηre for various Figures 21 and 22 show the thermal efficiency ηt and exhaust heat recovery ratios ηre for various Figures 21 and 22 show the thermal efficiency ηt and exhaust heat recovery ratios ηre for various split ratios and turbine inlet pressures. The optimal SR leading to the highest ηt decreases with the split ratios and turbine inlet pressures. The optimal SR leading to the highest ηt decreases with the split ratios and turbine inlet pressures. The optimal SR leading to the highest ηt decreases with the rising of the turbine inlet pressure, but the highest ηt is affected little by the turbine inlet pressure. rising of the turbine inlet pressure, but the highest ηt is affected little by the turbine inlet pressure. rising of the turbine inlet pressure, but the highest ηt is affected little by the turbine inlet pressure. The rising of the turbine inlet pressure contributes positively to the exhaust heat recovery ratio ηre, The rising of the turbine inlet pressure contributes positively to the exhaust heat recovery ratio ηre, The rising of the turbine inlet pressure contributes positively to the exhaust heat recovery ratio ηre, which is consistent with the results of the recuperation of the S-CO2 cycle. The rising of the turbine which is consistent with the results of the recuperation of the S-CO2 cycle. The rising of the turbine which is consistent with the results of the recuperation of the S-CO2 cycle. The rising of the turbine inlet pressure can cause rising of the enthalpy at the turbine inlet, which leads to the increase of the net inlet pressure can cause rising of the enthalpy at the turbine inlet, which leads to the increase of the inlet pressure can cause rising of the enthalpy at the turbine inlet, which leads to the increase of the outputpower.Meanwhile,thechangetrendofthenetoutputpowerandheatabsorbedbyCO both 2 net output power. Meanwhile, the change trend of the net output power and heat absorbed by CO2 net output power. Meanwhile, the change trend of the net output power and heat absorbed by CO2 changes. So, the peak of ηt moves backwards with the decreasing of the turbine inlet pressure. both changes. So, the peak of ηt moves backwards with the decreasing of the turbine inlet pressure. both changes. So, the peak of ηt moves backwards with the decreasing of the turbine inlet pressure. Figure 21. Thermal efficiency for various split ratios and turbine inlet pressures. Figure 21. Thermal efficiency for various split ratios and turbine inlet pressures. Figure 21. Thermal efficiency for various split ratios and turbine inlet pressures.

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