Effect of regeneration on a steam power cycle Considering a regenerative Rankine cycle with feedwater heating, identify the correct impact on specific work and thermal efficiency. Choose the correct statement.
Mechanical Engineering
Steam Nozzles and Turbines
Difficulty: Easy
Choose an option
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AIncreased work output per unit mass of steam
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BDecreased work output per unit mass of steam
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CIncreased thermal efficiency
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DDecreased work output per unit mass as well as increased thermal efficiency
Answer
Correct Answer: Decreased work output per unit mass as well as increased thermal efficiency
Explanation
Concept/Approach
- Regeneration extracts bleed steam for feed heating, reducing flow through later turbine stages and thus specific work decreases.
- Raising feedwater temperature increases the mean temperature of heat addition, so thermal efficiency increases.
Final AnswerDecreased specific work and increased thermal efficiency