A novel thermodynamic system is proposed to recover the waste heat of an internal combustion engine (ICE) by integrating the\ntrans critical carbon dioxide (CO2) refrigeration cycle with the super criticalCO2 power cycle, and eight kinds of integration schemes\nare developed. The key parameters of the system are optimized through a genetic algorithm to achieve optimum matching with\ndifferent variables and schemes, as well as the maximum net power output (????net). The results indicate that replacing a single turbine\nscheme with a double-turbine scheme can significantly enhance the net power output (????net) and lower the inlet pressure\nof the power turbine (????4). With the same exhaust parameters of ICE, the maximum ????net of the double-turbines scheme is 40%ââ?¬â??\n50% higher than that of the single-turbine scheme. Replacing a single-stage compression scheme with a double-stage compression\nscheme can also lower the value of ????4, while it could not always significantly enhance the value of ????net. Except for the power\nconsumption of air conditioning, the net power output of this thermodynamic system can reach up to 13%ââ?¬â??35% of the engine\npower when it is used to recover the exhaust heat of internal combustion engines.
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