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.
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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.
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