Mechanical Engineering Exam > Mechanical Engineering Questions > In a Rankine cycle, regeneration results in h...
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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?
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Most Upvoted Answer
In a Rankine cycle, regeneration results in higher efficiency becausea...
Explanation:
Regeneration is a process in the Rankine cycle where some of the steam leaving the high-pressure turbine is used to heat the feedwater before it enters the boiler. This process results in a higher efficiency of the cycle. The reason for this is explained below.
Average Temperature of Heat Addition Increases:
The efficiency of the Rankine cycle is determined by the temperature difference between the heat source (boiler) and the heat sink (condenser). The greater the temperature difference, the higher the efficiency. The temperature difference can be increased by increasing the temperature of the heat source or decreasing the temperature of the heat sink.
When regeneration is used, some of the steam leaving the high-pressure turbine is used to heat the feedwater before it enters the boiler. This results in an increase in the average temperature of heat addition in the boiler. The higher temperature of the heat source increases the temperature difference between the heat source and the heat sink, which results in a higher efficiency of the cycle.
Conclusion:
Therefore, the correct answer to the given question is option C: Average temperature of heat addition in the boiler increases.
Regeneration is a process in the Rankine cycle where some of the steam leaving the high-pressure turbine is used to heat the feedwater before it enters the boiler. This process results in a higher efficiency of the cycle. The reason for this is explained below.
Average Temperature of Heat Addition Increases:
The efficiency of the Rankine cycle is determined by the temperature difference between the heat source (boiler) and the heat sink (condenser). The greater the temperature difference, the higher the efficiency. The temperature difference can be increased by increasing the temperature of the heat source or decreasing the temperature of the heat sink.
When regeneration is used, some of the steam leaving the high-pressure turbine is used to heat the feedwater before it enters the boiler. This results in an increase in the average temperature of heat addition in the boiler. The higher temperature of the heat source increases the temperature difference between the heat source and the heat sink, which results in a higher efficiency of the cycle.
Conclusion:
Therefore, the correct answer to the given question is option C: Average temperature of heat addition in the boiler increases.
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In a Rankine cycle, regeneration results in higher efficiency becausea...
Average temperature of heat addition will reduce the work input so this will result in higher efficiency
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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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