Chapter 6, Problem 6.42P

Interpretation Introduction

Interpretation:

The thermal efficiency of a steam turbine which is ratio of actual work of the turbine to the work of a turbine operating isentropically from the same initial condition to same exhaust pressure.

Concept Introduction:

The thermal efficiency of a steam turbine is calculated as:

  $\eta =\frac{\text{actual work of the turbine}}{\text{work of a turbine operating isentropically}}=\frac{H_2-H_1}{H^{\text{'}}-H_1}$

Where,

  $H_2$ is the enthalpy of exhaust from the turbine

  $H_1$ is enthalpy of steam given to turbine

  $H^{\text{'}}$ is enthalpy of steam when turbine operating isentropically from the same initial condition to same exhaust pressure.