Power Systems and Components

Thermal power generation: the power cycles and the components that run them — turbines, boilers and steam generators, condensers, and the cycles themselves. One of the heavier areas on the Thermal & Fluid Systems depth.

What the problems look like

Cycle and component analysis — Rankine / Brayton / combined cycles (thermal efficiency, net work, heat rates, reheat/regeneration); turbine work and isentropic efficiency; boiler/steam-generator duty and waste-heat recovery; condenser heat rejection. Steam-property work (tables / Mollier) throughout. Calculation-heavy.

By exam day you should be able to —

• analyze power cycles — Rankine, Brayton, combined: thermal efficiency, net work, heat rate, reheat/regeneration;
• compute turbine work and apply isentropic efficiency; expand steam using tables / the Mollier chart;
• find boiler/steam-generator duty and waste-heat recovery;
• compute condenser heat rejection.

Where people lose points

• Isentropic-efficiency direction — actual turbine work is less than ideal; actual pump/compressor work is more.
• Heat rate ↔ efficiency — heat rate (Btu/kWh) = 3,412/η; they move inversely, and the direction gets flipped.
• Wrong property state — saturated vs. superheated; mishandling quality (x).
• Confusing cycle efficiency with a single component efficiency.
• Forgetting pump work in Rankine (small but tested) / the back-work ratio in Brayton.

Have these at your fingertips

The Rankine/Brayton T–s diagrams, η_th = W_net/Q_in, isentropic efficiency, and the steam tables — plus where they sit in the Handbook.

Going deeper

• Power cycles — Rankine & Brayton

Part of the Thermal & Fluid Systems depth. Practice this area with exam-real problems — the tutor walks any one you miss. → Start your 7-day free trial — no card. Or take the free practice exam first.