To investigate the steady state performance of supercritical carbon dioxide closed cycle

by integrating the mathematical models of major components in power system such as compressor

turbine and heat exchanger into a nonlinear equation group that each component need when works together

a system-level model which is capable of predicting the design-point and off-design operation of supercritical carbon dioxide closed cycles was developed. Moreover

the system-level model was used to compare the performance of 10 MW-level simple cycle and recompression cycle under design and off-design conditions. The result indicates that the recompression cycle shows a better performance under design conditions

but its performance drops faster if the split ratio is not optimized under off-design conditions.