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Reheat Rankine Cycle: TS Diagram

Reheat Rankine Cycle

is a

Superheat Rankine Cycle

that uses two turbines to make it possible to operate the condenser at a low pressure and still maintain a very high quality at the turbine effluent.

Because of the reheat step between the two turbines, the quality of the low-pressure turbine effluent can be kept very high.

This facilitates the use of very high boiler pressures and low condenser pressures.

Process flow diagram of a Reheat Rankine Power Cycle.

TS Diagram that shows the effects of changing the basic Rankine Vapor Power Cycle into a Reheat Rankine Cycle.

Lesson
9C Blog

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Lesson 9C: page 6 of 16

The TS Diagram shows us that the reheat rankine cycle combines all of the advantages of of the superheat method with the simple method of increasing the boiler pressure and decreasing the condenser pressure.
The result is an increase in QH and no change or even a decrease in QC. Both of these effects result in a significant increase in the thermal efficiency.
At the same time, the quality of the effluent from the final turbine increased.
Perhaps you noticed that the same advantages could be gained using just a superheat cycle.
This possibility is represented by the yellow path on the TS Diagram.
The difference is that both the boiler and the turbine must be able to operate at MUCH higher temperatures to achieve comparable results using a Rankine Superheat Cycle.
So, the Rankine Reheat Cycle has some excellent characteristics.
Now, let’s talk about regeneration.

Reheat Rankine Cycle: TS Diagram

Reheat Rankine Cycle

Superheat Rankine Cycle

Ch 9, Lesson C, Page 6 - Reheat Rankine Cycle: TS Diagram