Q1/ Determine the heating area required for the production of 1000 lb/hr of 50% from 10% NaOH feed entering at 100 F. Evaporation is to be carried out in a single effect evaporator for which overall coff. of 500 Btu/hr.ft.F is expected. Saturated steam available at 50 psi and the evaporator can be operated available at 10 psi vacuume relative to a barometric pressure of 14.7 psi. BPR = 78 F using steam table for additional data.