# Ch 9 - Power Systems

This lesson begins with an overview of the difference between vapor and gas power cycles. We also review the relationships between heat and work and areas on PV and TS Diagrams.

In this lesson, we learn that the Carnot Cycle is not a good model for vapor power systems. We introduce a new model, the ideal Rankine Cycle, that is better suited to the limitations of real pumps and turbines.

In this lesson, we consider five improvemnts to the Rankine Cycle: superheat, reheat, regeneration, cogeneration and binary vapor power cycles. The key to understanding these more complex suystems is the TS Diagram.

In this lesson, we consider the characteristics that distinguish real vapor power cycles from the ideal Rankine Vapor Power Cycle. We show how these phenomena effect the cycle path on a TS Diagram and then perform a thermodynamic analysis to determine the lost work associated with a real vapor power cycle.

In this lesson, we study gas power cycles. We introduce the Brayton Cycle and use the Cold Air-Standard Assumptions to help us simplify our analysis of the cycle. We find that the pressure ratio across the compressor is the key parameter that determines the thermal efficiency of the Cold Air-Standard Brayton Cycle. We also briefly discuss sources of irreversibility in the Brayton Cycle.

In this lesson, we consider three methods to improve the thermal efficiency of the Air-Standard Brayton Cycle. They are: reheat, intercooling, and regeneration. Regeneration is the key.

- Vapor and Gas Power Systems

- The Carnot and Rankine Cycle

- Improvements on the Rankine Cycle

- Non-Ideal Vapor Power Cycles

- Air-Standard Power Cycles

- Variations on the Brayton Cycle

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