GATE ME 2016 Set 1 — Question 29
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Thermodynamics → Power Cycles → Rankine, Reheat & Regenerative
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Question
The INCORRECT statement about regeneration in vapor power cycle is that
Correct answer
(A) it increases the irreversibility by adding the liquid with higher energy content to the steam generator
Solution
Regeneration in a vapor power cycle is used to increase the thermal efficiency by preheating the feedwater using steam extracted from the turbine. This process reduces the irreversibility of the cycle by bringing the average temperature of heat addition closer to the average temperature of heat rejection, thereby reducing the temperature difference during heat transfer in the boiler.Let's analyze the given statements:
(A) This statement claims that regeneration increases irreversibility. This is incorrect. Regeneration aims to reduce irreversibility and improve efficiency by reducing the temperature difference during heat transfer in the boiler. By adding liquid with higher energy content (preheated feedwater) to the steam generator, less external heat input is required, which improves efficiency and reduces irreversibility.
(B) This statement accurately describes the heat exchange mechanism in a regenerative cycle, where extracted steam (expanding fluid) transfers heat to the feedwater (compressed fluid) before it enters the boiler.
(C) The principle of regeneration, which involves internal heat transfer to improve efficiency, is indeed similar to the concept of internal heat recovery in the Stirling gas cycle.
(D) Regeneration is practically implemented using devices called feedwater heaters, which can be open or closed types, to preheat the feedwater.Therefore, the INCORRECT statement is (A).The final answer is
(A) This statement claims that regeneration increases irreversibility. This is incorrect. Regeneration aims to reduce irreversibility and improve efficiency by reducing the temperature difference during heat transfer in the boiler. By adding liquid with higher energy content (preheated feedwater) to the steam generator, less external heat input is required, which improves efficiency and reduces irreversibility.
(B) This statement accurately describes the heat exchange mechanism in a regenerative cycle, where extracted steam (expanding fluid) transfers heat to the feedwater (compressed fluid) before it enters the boiler.
(C) The principle of regeneration, which involves internal heat transfer to improve efficiency, is indeed similar to the concept of internal heat recovery in the Stirling gas cycle.
(D) Regeneration is practically implemented using devices called feedwater heaters, which can be open or closed types, to preheat the feedwater.Therefore, the INCORRECT statement is (A).The final answer is
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