Question

Superheated steam at 2 bar and 150oC is compressed isothermally. The steam in its final state is wet steam with a specific volume of 0.3511 m3 /kg.

Determine the change of enthalpy per kg of steam.

Answer 1

$\frac mMRT_1=p_1V_1=p_2V_2,$

$p_2=\frac{RT_1} M\cdot \frac m{V_2}=3.45~bar,$

$m=\frac{p_2V_2M}{RT_1}=0.45~kg,$

$H=\frac{\gamma nR}{\gamma -1}=2.18~\frac JK .$