8.6 Enhancements of Rankine Cycles

8.6 Enhancements of Rankine Cycles - 8.6 Enhancements of...

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Thermodynamics and Propulsion Next: 8.7 Combined Cycles for Up: 8. Power Cycles with Previous: 8.5 Rankine Power Cycles Contents Index 8.6 Enhancements of, and Effect of Design Parameters on, Rankine Cycles The basic Rankine cycle can be enhanced through processes such as superheating and reheat. Diagrams for a Rankine cycle with superheating are given in Figure 8.13. The heat addition is continued past the point of vapor saturation, in other words the vapor is heated so that its temperature is higher than the saturation temperature associated with . This does several things. First, it increases the mean temperature at which heat is added, , thus increasing the efficiency of the cycle. Second is that the quality of the two-phase mixture during the expansion is higher with superheating, so that there is less moisture content in the mixture as it flows through the turbine. (The moisture content at is less than that at .) This is an advantage in terms of decreasing the mechanical deterioration of the blading. Figure 8.13:
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8.6 Enhancements of Rankine Cycles - 8.6 Enhancements of...

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