$50\%$ concentrated solution from $5\%$ sugar solution fed to the film type evaporator with a flow rate of $5000$ kg$/$h

solution is obtained. $120\backslash$deg C as heating steam to evaporate the water in the solution.

saturated steam is used. At the end of the process, the heating steam comes out of the evaporator into saturated liquid.

It comes out as $.$ The solution boils at $105\backslash$deg C and the evaporator economy is $85\%.$ Total heat

transfer coefficient $1875$ W$/$m$2$

Since $.$K$,$ find the required heat transfer area.

Saturated vapor enthalpy at $120\backslash$deg C: $2706$ kJ$/$kg

Saturated liquid enthalpy at $120\backslash$deg C: $504$ kJ$/$kg

NOTE: Evaporator economy $($E$)=$Evaporated solution $($V$,$ kg$/$h$)/$ heating steam $($S$,$ kg$/$h$)$