What is the thermal efficiency of this regeneration cycle in terms of enthalpies and fractions of total flow?

Explanation:

generally regeneration of cycle is used in the case of gas turbine. due to regeneration efficiency of turbine is increased but there is no effect on the on the net work out put of turbine.Actually in regeneration net heta input is decreases that is why total efficiency  increase.

 Now from T-S diagram

  Due to generation amount of energy has been saved.

So efficiency of cycle

Effectiveness of re-generator

So the efficiency of regenerative cycle

answer:

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