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The vessel’s waste heat has the characteristics of a large temperature gradient, huge recoverable volumes, and various properties. TEG-ORC combined cycle is a promising method for multiple vessels waste heat cascade utilization. Keeping the evaporation pressure at 0.7Mpa, R245fa of low toxicity and environmental friendly is employed for the research under the conditions of different bottom cycle ratios( ₣ ) and superheating. The interaction between essential parameters and system performance is explored. As the  ₣  gets larger, the system net power output ( Wnet), the system thermal efficiency ( ηs) and the waste heat utilization of main engine flue gas ( fg) gradually increase, the power-production cost ( Cg) of the system gradually decreases. When the degree of superheat increases from 3.36K to 9.23K, the output power of the expander increases synchronously. The results show that superheating improves the combined cycle  Wnetand  fgwhile reducing the Cg. The stability and safety of the ORC unit are further enhanced by expanding the  ₣ . When the  ₣  is 0.885 and superheat is 11.28 K,  Wnetis 965.18 W,  ηsis 8.74%, and the  Cgof the system is 0.5363 $ k Wh −1 , and the rate of  fgis 85.07%.

Influence study of bottom cycle ratios and superheat for vessels waste heat cascade recovery based on TEG-ORC combined cycle system employing R245fa