Lowcritical temperature limits the application of CO
2
trans-critical power cycle. The binary mixture of R290/CO
2
has higher critical temperature. Using mixture fluid may solve the problem that subcritical CO
2
is hardly condensed by conventional cooling water. In this article
theoretical analysis is executed to study the performance of the zeotropic mixture for trans-critical power cycle using low-grade liquid heat source with temperature of 200℃. The results indicated that the problem that CO
2
can't be condensed in power cycle by conventional coolingwater can be solved bymixing R290 to CO
2
. Variation trend of outlet temperature of thermal oil in supercritical heaterwith heating pressure is determined by the composition of the mixture fluid. Gliding temperature causes the maximum outlet temperature of cooling water with the increase of mass fraction of R290. There are themaximumvalues for cycle thermal efficiency and net power outputwith the increase of supercritical heating pressure.
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