Find the work required for the process.

3 kg of steam in a piston -cylinder device at 400 kPa and 175 degree Celsius undergoes a mechanically reversible ,isothermal  compression to a final pressure such that the steam becomes just saturated.What is the work required for the process.


For saturated vapour




Asked on 29th September 2019 in Propulsion.
Add Comment
  • 1 Answer(s)

    We have

    \[q=T\left ( s_{2} -s_{1}\right )\]
    \(\\=\left ( 175+273 \right )\left ( 6.622-7.055 \right )
    \\W=q-\left ( u_{2}-u_{1} \right )
    \\=\left ( -193.984-\left ( 2579-2606 \right ) \right )\times 2
    \\= -500.94\;kJ\)

    Therefore work required for the process is approximately  -501 kJ.

    Answered on 29th September 2019.
    Add Comment
  • Your Answer

    By posting your answer, you agree to the privacy policy and terms of service.