Thermodynamics Problem A fixed mass of saturated water vapor

Thermodynamics Problem:

A fixed mass of saturated water vapor at 1 MPa is isothermally cooled until it is a saturated liquid.

Calculate the amount of heat rejected in the process, in kJ/kg.

Solution

From steam tables,

At P= 1Mpa,

hfg= specific enthalpy= 2013.6 kJ/kg

hfg itself gives the heat rejected while cooling from saturated vapour to saturated water.