GATE ME 2019 Set 2 — Question 23
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Thermodynamics → Power Cycles → Rankine, Reheat & Regenerative
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Question
Which one of the following modifications of the simple ideal Rankine cycle increases the thermal efficiency and reduces the moisture content of the steam at the turbine outlet?
Correct answer
(C) Increasing the turbine inlet temperature.
Solution
In a Rankine cycle:
1.Increasing boiler pressure increases thermal efficiency but also increases the moisture content (decreases quality) at the turbine exit.
2.Decreasing condenser pressure increases thermal efficiency but also increases the moisture content at the turbine exit.
3.Increasing turbine inlet temperature (superheating) increases the mean temperature of heat addition, which increases thermal efficiency. On a diagram, this modification shifts the expansion process to the right, resulting in a higher quality (lower moisture content) at the turbine outlet.
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