Chapter 3.8, Problem 7E

(A)

Interpretation Introduction

Interpretation:

The difference between specific enthalpy of exiting and entering stream of the steam.

Concept Introduction:

The exiting specific enthalpy $\left({\widehat{H}}_{exiting}\right)$ equation.

${\widehat{H}}_{exiting}=\left(1-x\right){\widehat{H}}^L+x{\widehat{H}}^V$

Here, enthalpy in vapor phase is ${\widehat{H}}^V$, quality or dryness fraction is $x$, and enthalpy in liquid phase is ${\widehat{H}}^L$.

The difference between specific enthalpy $\left(\Delta \widehat{H}\right)$ of exiting and entering stream of the steam.

$\Delta \widehat{H}={\widehat{H}}_{exiting}-{\widehat{H}}_{entering}$

Here, entering enthalpy is ${\widehat{H}}_{entering}$ and exiting enthalpy is ${\widehat{H}}_{exiting}$.

(B)

Interpretation Introduction

Interpretation:

Mass flow rate $\left(\dot{m}\right)$ of the entering steam.

Concept Introduction:

Work done equation for the adiabatic turbine.

$\frac{\dot{W}}{\dot{m}}={\widehat{H}}_{exiting}-{\widehat{H}}_{entering}$