Finding quality at turbine outlet

[zack7]

Homework Statement

Consider a 210MW steam power plant that operates on a simple Rankine cycle. Steam
enters the turbine at 10MPa and 500^°C and is cooled in the condenser at a pressure of10kPa. The adiabatic efficiency of the turbine and pump is 85% (a) the quality of the steam at
the turbine exit.

Homework Equations

x=($\frac{So-Sf}{Sfg}$)

The Attempt at a Solution

x=($\frac{6.6-0.65}{7.5}$)
=0.8

but the right answer is 0.874

Found the solution already, thank you

 

[KataKoniK]

!

Hello,

Thank you for sharing your solution attempt. It looks like you have used the correct formula to calculate the quality of steam at the turbine exit. However, there may be a mistake in the values you have used for the specific entropy of saturated liquid (Sf) and the specific entropy of saturated vapor (Sfg). It would be helpful to double check these values to see if they match the values in the given problem. If they do not, that could explain the discrepancy between your answer and the correct answer of 0.874.

Additionally, it may be helpful to show your work and calculations in more detail so that others can better understand your thought process and potentially identify any errors.

Best of luck with your studies!