Based on the thermodynamic model of supercritical carbon dioxide power system,the variation law of cycle efficiency under comprehensive influence of multiple process parameters was studied. The results show that:When the maximum system pressure is lower than the critical value,the cycle efficiency decreases with the increase of inlet pressure,first increases and then decreases with the increase of the inlet temperature;When the maximum system pressure is greater than the critical value,the cycle efficiency first increases and then decreases with the increase of inlet pressure,and decreases with the increase of inlet temperature. By analyzing the reasons for the transformation of cycle efficiency with the variation of compressor inlet parameters,calculation method of the critical value of maximum cycle pressure was proposed,and a simple optimization design method of supercritical carbon dioxide simple cycle parameters which can significantly improve the efficiency of cycle parameter optimization was proposed and verified.
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