A feed containing 3% by weight sugar is fed to a double-acting feedback evaporator.

The feed enters the system at 45C and concentrates up to 25 wt% sugar content.

The boiling point elevation of the solution is negligible.

Each effect has a surface area of 93 m2 and the collective heat transfer coefficients are U1=

It is 2835.3 W/m2K and U2=3969.4 W/m2K.

Saturated steam first at 689.3 kPa absolute pressure

The effect is fed as the heating medium and the evaporation absolute pressure in the second effect is 6.75 kPa.

The heat capacity of all solutions is considered equal to the heat capacity of water.

Feed calculate the flow rate (kg/h) and the flow rate (kg/h) of the product containing 25% DM.

Calculate by trial and error method.

Initial feed flow rate 454 Take it as kg/h.