Unit Operations-2 : Food Engineering

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% sugar content by weight is being done. The boiling point elevation of the solution is negligible is considered. Each effect has a surface area of 93 m2 and the collective heat transfer coefficients are U1=2835.3 W/m2K and U2=3969.4 W/m2K.

Saturated steam first at 689.3 kPa absolute pressure and 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% Dry Matter.

(The solution of the problem will be done by trial and error method. Initially, the feed flow rate is 454 kg/h , It can be started by taking it as)

Note: Write clearly all the operations you have done in solving the problem and schematize the system.