A feed containing 3% by weight sugar is fed to a double-acting feedback evaporator. The feed enters the system at 45C and is concentrated to a sugar content of 25% by weight. The boiling point elevation of the solution is considered negligible. The surface area of each effect is 93 m and the mass heat transfer coefficients are U-2835.3 W/mK and Uz-3969.4 W/mK. At an absolute pressure of 689.3 kPa, saturated steam is supplied to the first effect 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. Calculate the feed flow (kg/h) and flow (kg/h) of the product containing 25% DM. (The solution of the problem will be done by trial and error method. At the beginning, the feeding flow can be taken as 454 kg/h and the trial can be started) Note: Please write clearly all the operations you have done in solving the problem. and schematize the system.

A feed containing 3% by weight sugar is fed to a double-acting feedback evaporator. The feed enters the system at 45C and is concentrated to a sugar content of 25% by weight. The boiling point elevation of the solution is considered negligible. The surface area of each effect is 93m2 and the mass heat transfer coefficients are U2835.3 W/m2K and Uz3969.4W/m2K. At an absolute pressure of 689.3kPa, saturated steam is supplied to the first effect as the heating medium, and the evaporation absolute pressure in the second effect is 6.75kPa. The heat capacity of all solutions is considered equal to the heat capacity of water. Calculate the feed flow (kg/h) and flow (kg/h) of the product containing 25% DM. (The solution of the problem will be done by trial and error method. At the beginning, the feeding flow can be taken as 454kg/h and the trial can be started) Note: Please write clearly all the operations you have done in solving the problem. and schematize the system