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Processes 2020, 8, 1461 9 of 18 the decrease in system thermal efficiency. Moreover, the single regenerative power cycle shows the best economy. Kim et al. [72] compared the thermodynamic performance of the waste heat recovery of gas turbines in a landfill plant with nine different configurations of the s-CO2 bottoming cycle. The study showed that the recompressing cycle was not suitable for waste heat recovery, and the two-stage split-flow cycle had a significant effect on the improvement of the net output power of the overall system, but its structure was too complex. Khadse et al. [73] carried out an investigation of a simple construction of a s-CO2 bottoming cycle to recovery the waste heat recovery from a gas turbine. The results indicated that a maximum improvement of 22.9% can be gained by the use of recompression configuration. Cao et al. [74] propose a cascade configuration which composed of a s-CO2 Brayton cycle and a transcritical CO2 Rankine cycle to recovery the waste heat from a gas turbine. Both cycles were based on simple configurations, and the CO2 was condensed by using the cold energy of LNG (liquid nature gas). The results indicated that the power output by cascade cycles contributed nearly 28.9–39.1% to the power output of the whole system. Moreover, the investigation from Gao et al. [75] indicated that the partial heating cycle provided the highest power output compared to the single regenerative cycle due to its good waste heat absorption performance. Tozlu et al. [76] carried out a bi-objective optimization of a single regenerative s-CO2 cycle for waste heat recovery from the exhaust gas of gas turbine. It was found that the s-CO2 bottoming cycle showed a potential to increase the net power output of the turbines by 19.3%. Zhang et al. [77] proposed an improved cascade s-CO2 bottoming cycle for recovering the waste heat from flue gas of the offshore oil- and gas platform and adopted an artificial bee colony algorithm to carry out the multi-objective optimization of the bottoming cycle design parameters. The results showed that the s-CO2 bottoming cycle could improve the net output power of the overall system by 30% under rated conditions. Meanwhile, the high-temperature part of the cascade cycle had a greater impact on the thermal performance of the overall system, while the low-temperature part had a greater impact on the economic performance of the overall system. Sánchez et al. [78] usea partial heating s-CO2 bottoming cycle to recover the waste heat from high temperature exhaust of a gas turbine. The results showed that, compared to conventional steam bottoming cycle, the proposed partial heating s-CO2 bottoming cycle reached a high thermal efficiencyand reduced the system initial investment by a quarter. Zhou et al. [79] developed a novel supercritical-/transcritical-CO2 combined cycle system for recovering waste heat from offshore gas turbines. Comprehensive parametric analysis was conducted to simultaneously optimize the net output work and net present value (NPV) under different conditions. Recently, Tao et al. [80] proposed applying the two-stage reheat and recompression split s-CO2 cycle to recover the waste heat of gas turbines in distributed energy system. The preliminary thermodynamic analysis results showed that the total thermal efficiency of the system could reach up to 48% under the optimal split ratio. 4.4. Others Other studies in this field have been summarized in this section. Wang et al. [81] adopted a genetic algorithm to optimize the exergy-economy of a s-CO2 bottoming cycle for recovering waste heat from combustion engines in nuclear reactors, which increased the total thermal efficiency and the net output power of the overall system by 7.92%, and 13.7 MW, respectively. Astolfi et al. [82] compared the performance of the dual regeneratives-CO2 bottoming cycle against three traditional cycle layouts. The results indicated that the dual regenerative layout was found to be the best choice, if the minimum heat source temperature has been not constrained. Olumayegun et al. [83] studied the dynamic performance of the recompression s-CO2 cycle for recovering waste heat from cement plants. Those results indicated that the inlet temperature of the main compressor could be controlled by adjusting the mass flow of cooling water, and the inlet pressure of the compressor could be kept constant through the throttle valve to improve the dynamic performance of the whole cascade system. Luo et al. [84] proposed a multi-generation system which combined s-CO2 cycle and transcritical CO2 refrigeration cycles using waste heat as power source. Exergoeconomic evaluation and optimizationPDF Image | s-CO2) Power Cycle for Waste Heat Recovery
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