The Supercritical Rankine Cycle

Process flow diagram of a basic Rankine Vapor Power Cycle.
In a

Supercritical Rankine Cycle

, the operating pressure of the boiler is greater than the critical pressure of the working fluid.
The heat exchanger in which the working fluid absorbs heat from the hot reservoir is not always called a boiler. This heat exchanger, sometimes called a steam generator, produces a superheated vapor.
The

thermal efficiency

of the cycle increases because QH increases greatly while QC increases very little. The majority of the additional heat input, relative to the

Rankine Cycle

, is converted into work. This method can also produce an increase in the quality of the turbine effluent.
TS Diagram showing the effect of modifying the basic Rankine Vapor Power Cycle so that the operating pressure of the boiler is greater than the critical pressure of the working fluid.  As a result, the boiler effluent is a superheated vapor.
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Ch 9, Lesson C, Page 4 - The Supercritical Rankine Cycle