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Ocean Thermal Energy Conversion (OTEC) is able to supply stable electric power and presents a variety of integrated applications. The thermal efficiency of the cycle using pure substance as working fluid that converts thermal energy of the ocean into work increases with a decrease of irreversible losses in the cycle or an increase of the effective temperature difference between evaporating and condensing temperature of the working fluid. Therefore, improvement in the system performance is achieved by decreasing the irreversible losses in the evaporators and the condensers. This paper investigates the thermal performance of Double-stage Rankine (D-Rankine) cycle that employs independent equipment in two Rankine cycles. The D-Rankine cycle was com-pared with the Single-stage Rankine (S-Rankine) cycle as well as Kalian cycle and has shown the best performance in terms of maximum output power. The advantage of using two independent cycles is that it decreases irreversible losses in the heat exchangers. As a result, in the case of equal working fluid flow rates in D-Rankine cycle, the warm and the cold water temperature differences in cycles-No.1 and -No.2 are almost identical. The difference of power output between D-Rankine cycle and S-Rankine cycle at a fixed thermal efficiency increases with an increase of the thermal performance of the heat exchangers. In the case of high thermal performance, the maximum power output of D-Rankine cycle is about 15% and 2% higher than that of 5-Rankine cycle and Kalina cycle, respectively.<\/p>\n","protected":false},"excerpt":{"rendered":"
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