Working fluid used in binary cycle power generation systems currently commercialized or demonstrated, such as water-ammonia, pentane, or chlorofluorocarbon, has problems including odor, combustibleness, corrosiveness, and a high global warming potential. In order to avoid those problems, the authors have started development of a steam water binary cycle system. The system under development has remarkable features such as a two stage Rankine cycle, high speed turbo generators with gas bearings, and compact heat exchangers, which are expected to contribute realizing high cycle efficiency and compactness. This paper presents some results of cycle calculation in various conditions. Influence on cycle efficiency in terms of design parameters including cooling water temperature, heat input ratio in the high and low pressure stages, and existence of non-condensing gas in the circulation loop are examined.
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