Abstract
In the new century, 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 this cycle. As a result, the maximum output power of Double Stage-Rankine cycle is larger than that of Kalina cycle. Double Stage-Rankine cycle using ammonia in cycle-No.1 is larger than that using HFC245fa. On the other hand, evaporation pressure of ammonia is 2MPa or more in this calculation conditions.
