Abstract
In the new century, the energy and environmental problems are becoming more critical, the development of natural energy is desired. Low-grade Thermal Energy Conversion (LTEC) is refocused as one of the renewable energy. The aim of this study is to improve the system performance with Double Stage-Rankine cycle. The irreversible loss in heat exchanger can be decreased at the cycle. As a result, the thermal efficiency of Double Stage-Rankine cycle is larger than that of Rankine cycle, and is smaller than that of Kalina cycle. On the other hand, the maximum of turbine power of Double Stage-Rankine cycle is larger than that of Rankine cycle and Kalina cycle.
