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The incorrect statement about regeneration in a vapour power cycle is that

1. it increases the irreversibility by adding the liquid with higher energy content to the steam generator
2. heat is exchanged between the expanding fluid in the turbine and the compressed fluid before heat addition
3. the principle is similar to the principle of Stirling gas cycle
4. it is practically implemented by providing feed water heaters

Correct answer: it increases the irreversibility by adding the liquid with higher energy content to the steam generator

Solution

Regeneration uses steam extracted from the turbine to heat the feedwater before it enters the boiler, reducing irreversibility and improving efficiency. Therefore, the statement claiming it increases irreversibility is incorrect.

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