Question
Download Solution PDFRegenerative heating ________ the thermal efficiency of a Rankine cycle.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Regeneration means to take some part of the heat from the expanding steam in the turbine to decrease the overall heat supplied in the process.
In the regenerative cycle, a portion of the partially expanded steam is drawn off between the high - and low - pressure turbines. The steam is used to preheat the condensed liquid before it returned to the boiler. In this way, the amount of heat added at the low temperatures is reduced. Therefore, the mean effective temperature of heat addition is increased, and cycle efficiency is increased.
∵ \(thermal\;efficiency\left( {{\eta _{th}}} \right) = 1 - \left( {\frac{{{Q_{out}}}}{{{Q_{in}}}}} \right)\)
And we can see that as the denominator is increased keeping the numerator constant we will get the lower value to subtract hence the overall value will be increased i.e. thermal efficiency will be increased.
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