What is the main purpose of the condenser in the Rankine cycle?

• A. To cool the exhaust gases for environmental reasons.
• B. To heat the atmosphere.
• C. To return condensate to the boiler feedwater loop for reuse.
• D. To increase turbine inlet pressure.

Answer: (C)

The main idea is that the condenser turns the exhaust steam from the turbine back into liquid water and feeds it back into the boiler feedwater loop. By cooling the steam, it creates condensate that is pumped back to the boiler, keeping the cycle closed, reducing makeup water needs, and allowing the turbine to exhaust at a lower pressure. This lower exhaust pressure increases the turbine’s work output and improves overall cycle efficiency. The condenser also helps remove non-condensable gases and maintains the water in good condition for reuse. The other options describe functions not performed by the condenser in a Rankine cycle: environmental cooling of exhaust gases, heating the atmosphere, or increasing turbine inlet pressure.