The revelation of electric power was the main impetus behind the second modern transformation, and the steam Rankine cycle, controlled by petroleum derivatives, is presently the most widely recognized power source. Obviously, the quick utilization of non-renewable energy sources has brought about a large number of extreme ecological issues, including air contamination, an Earth-wide temperature boost, ozone consumer emergency and contamination issues is to figure out how to productively utilize low and medium temperature energy. Due of the natural Rankine cycle's helpfulness and unwavering quality, it has drawn in a great deal of consideration and examination during the most recent twenty years. This article explores the different coolants and expanders for the natural Rankine cycle, including a survey of unadulterated or blended working liquids evaluating research for the natural Rankine cycle a looked at of valid as well as mix working liquids applications, and a discussion of a wide range of development machine working standards.