A backward feed double effect evaporator is to be used to produce $1\mathrm{.}26k\frac{g}{s}$ of

concentrated liquor from a feed solution of $6\mathrm{.}3k\frac{g}{s}.$ Using the data given below,

calculate:

a$)$ The evaporation rate in each effect

b$)$ The steam consumption

c$)$ The heating surface in each effect

Data

Feed Temperature $=38C$

Specific heat capacity of all liquids $=4\mathrm{.}18k\frac{J}{k}gK$

Neglect any boiling point rise.