Calculate the steam requirements of a double-eff ect forward-feed evaporator ( Fig. E8.2 ) to…


Calculate the fume requirements of a double-eff ect forward-delight evaporator ( Fig. E8.2 ) to centralize a limpid livelihood from 11% aggregate solids to 50% aggregate solids centralize. The delight blame is 10,000 kg/h at 20°C. The outburst of limpid within the relieve eff ect takes settle underneathneath vacuum at 70°C. The fume is nature gifted to the fi rst eff ect at 198.5 kPa. The condensate from the fi rst eff ect is discarded at 95°C and from the relieve eff ect at 70°C. The overall heat-transfer coeffi cient in the fi rst eff ect is 1000 W/( m2 °C); in the relieve eff ect it is 800 W/( m2 °C). The peculiar heats of the limpid livelihood are 3.8, 3.0, and 2.5 kJ/(kg °C) at initial, intervening, and definite concentrations. Assume the areas and temperature gradients are correspondent in each eff ect.