A single effect evaporator for a diluted solution of NaCl (brine) is considered (Fig XXXXXXXXXXThe following data are available: feed brine flow F 0 = 1000 kg/h; feed brine mass fraction x 0 = 0.1;...

A single effect evaporator for a diluted solution of NaCl (brine) is considered (Fig. 6.16). The following data are available: feed brine flow F₀
= 1000 kg/h; feed brine mass fraction x₀
= 0.1; specific heat of the feed brine c_p0
= 3433 J/kgK; input temperature of the feed T^∘0 = 20^∘
. The output parameters are: production imposed to the evaporator is F₁
= 400 kg/h with mass fraction x₁
= 0.25, c_p1
= 3957 J/kgK T^∘1 = 107^∘
; latent vaporization heat l_v
= 2200 kJ/kg. Water specific heat c_pw
= 4180 J/kg; the steam flow V₀
used as agent is saturated at 120^∘C and totally condenses in the heater without another additional subcooling. The steady state characteristic f(V₀) has to be determined.