It is desired to
concentrate a 20% salt solution (20 kg of salt in 100 kg of solution)
to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min
at `30^circ`C. The boiling point of the solution is `110^circ`C, the latent heat of
vaporisation is 2100 kJ/kg and the specific heat of the solution is 4
kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to
the evaporator is
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