The seawater inlet for desalination is given to be at 298 K, 1 atm,
and a salinity of 0.042%. This condition is assumed to be conditions of
the environment. The speci
fi
c heat, the enthalpy and entropy of the
salt at T
0
=298 K taken to be cp
s
=0.8368 kJ/kg.K, h
s0
=20.92 kJ/kg
and S
s0
=0.0732978 kJ/kg.K, respectively. Hence, the enthalpy and
entropy of the salt at the temperature T can be determined from