![]() Therefore all important parameters of water and steam are tabulated in so-called “ Steam Tables”. In the case of the Rankine cycle, the Ideal Gas Law almost cannot be used (steam does not follow pV=nRT). Moreover it has a very high heat of vaporization, making it an effective coolant and medium in thermal power plants and other energy industries. ![]() For example, water has the highest specific heat of any common substance – 4.19 kJ/kg K. ![]() While many substances could be used as the working fluid in the Rankine cycle (inorganic or even organic), water is usually the fluid of choice due to its favorable properties, such as its non-toxic and unreactive chemistry, abundance, and low cost, as well as its thermodynamic properties. In contrast to the Brayton cycle, the working fluid in the Rankine cycle undergo the phase change from a liquid to vapor phase and vice versa. In this cycle, the heat is supplied externally to a closed loop, which usually uses water (in a liquid and vapor phase) as the working fluid. The Rankine cycle is an idealized thermodynamic cycle of a constant pressure heat engine that converts part of heat into mechanical work. The Rankine cycle was named after him and describes the performance of steam turbine systems, though the theoretical principle also applies to reciprocating engines such as steam locomotives.
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