Question

A single effect evaporator is used to concentrate a solution of 10% of total solids to 30% of total solids at a rate of 250 kg / h. if the evaporator pressure is 77 kpa, and if steam is available at 200 kpa gauge, the amount of steam needed per hour and the area of ​​heat transfer area if the overall heat transfer coefficient is 1700 jm -22s-1 ° C. the feed temperature is 18 ° C and the boiling point of the solution below 77 kpa is 91 ° C. the specific heat of the solution is the same as water, which is 4,186 x 103 jkg-1, and the latent heat of the evaporation of the solution is the same as the water under the same conditions
a. the amount of steam needed (kg/hour)
b. amount of heat moved area (m²)

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