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In a Rankine cycle, regeneration results in higher efficiency because
  • a)
    pressure inside the boiler increases
  • b)
    heat is added before steam enters the low pressure turbine
  • c)
    average temperature of heat addition in the boiler increases
  • d)
    total work delivered by the turbine increases
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
In a Rankine cycle, regeneration results in higher efficiency becausea...

Fig: T-s curve of simple Rankine cycle
From the observation of the T-s diagram of the rankine cycle, it reveals that heat is transferred to the working fluid during process 2-2' at a relatively low temperature. This lowers the average heat addition temperature and thus the cycle efficiency.
To remove this remedy, we look for the ways to raise the temperature of the liquid leaving the pump (called the feed water) before it enters the boiler. One possibility is to transfer heat to the feed water from the expanding steam in a counter flow heat exchanger built into the turbine, that is, to use regeneration.
A practical regeneration process in steam power plant is accomplished by extracting steam from the turbine at various points. This steam is used to heat the feed water and the device where the feed water is heated by regeneration is called feed water heater. So, regeneration improves cycle efficiency by increasing the average temperature of heat addition in the boiler.
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In a Rankine cycle, regeneration results in higher efficiency becausea)pressure inside the boiler increasesb)heat is added before steam enters the low pressure turbinec)average temperature of heat addition in the boiler increasesd)total work delivered by the turbine increasesCorrect answer is option 'C'. Can you explain this answer?
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