A single effect evaporator is required to concentrate a solution from 10% solids to 30% solids at the rate of 250 kg of

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A single effect evaporator is required to concentrate a solution
from 10% solids to 30% solids at the rate of 250 kg of feed per
hour. The temperature of the feed is 90°C. If the pressure in the
evaporator is 77 kPa absolute, and if steam is available at 100 kPa
gauge, calculate the quantity of steam required per hour and the
area of heat transfer surface if the overall heat transfer
coefficient is 1700 W/m2 °C.
Assume, also, that the specific heat of the solution is the same
as for water, that is 4.186 x 103 J/kg°C.
Comment on the steam economy of this system.