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Transcritical power cycles (TPCs) using CO2-based binary zeotropic mixtures for the conversion of low-grade geothermal water at 100–150°C into power are presented and analyzed when cooling water temperature (Tcw) is 10–30°C in this paper. 6 refrigerants are selected as the additives into CO2 according to 2 criteria. Performances of TPCs with 6 selected CO2-based mixtures are optimized by pattern search...