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Chapter 4: Q. 4.25 (page 137)

In a real turbine, the entropy of the steam will increase somewhat. How will this affect the percentages of liquid and gas at point4in the cycle? How will the efficiency be affected?

Short Answer

Expert verified

The efficiency of the cycle is always less than the expected efficiency.

Step by step solution

01

Step 1. Formula of efficiency

Efficiency of cycle is given by

e=1-H4-H1H3-H1

02

Step 2. Explanation

  • If the entropy of steam increases in the real turbine then there will be less water and more steam at point 4in the cycle. So, the value of H4will be much bigger which will affect the efficiency of the real turbine directly.
  • As, the value of H4is larger, then the efficiency of real turbine will be smaller. Hence, the cycle will have smaller efficiency.
03

Step 3. Conclusion

As a large amount of heat and pressure losses involved in the cycle.

Therefore, the efficiency of the cycle is always less than the expected efficiency.

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