The INCORRECT statement about regeneration in the vapor power cycle is that A. It increases the irreversibility by adding the liquid with higher energy content to the steam generator B. Heat is exchanged between the expanding fluid in the turbine and the compressed fluid before heat addition C. The principle is similar to the principle of the Stirling gas cycle D. It is practically implemented by providing feed water heaters
Answer: Let's start with the basic definition of efficiency,
The efficiency of any heat engine = 1 - TL/TH
TL = Temp of sink
TH = Temp of source
The higher the value of the TH the higher will be the efficiency of the heat engine.
Now, let's look at the ideal Rankine cycle without regeneration,
Due to the heat addition at low temperatures, the overall mean temperature of heat addition decreases resulting in the lower efficiency of the power plant.
Hence,
A new technique is used to increase the mean temperature of heat addition. It is increased by decreasing the amount of heat added at low temperatures. A high-temperature and high-pressure steam is extracted from the turbine (called bleeding) and used to heat the feedwater coming out of the pump. This process is done in a device called a feedwater heater (FWH)
(Tmean) without regeneration < (Tmean) with regeneration
So from the given options,
Option A is incorrect. There is no addition of any higher energy content liquid to the steam generator.
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