It is a simple evaporator entering 15,000 Kg/h of a solution coloidal composition 3% by weight and must be concentrated to 20% by weight. The heating is carried out by means of live steam that condenses at 110 C and the condensate leaves the condensation chamber without cooling. An absolute pressure of 230 mm Hg is maintained in the evaporation chamber. The solution has no appreciable increase in boiling point, and its specific heat can be considered equal to unity for all concentrations. Feed enters at 20C. The Integral heat transfer coefficient for the operating conditions is worth 1800 Kcal/m'.h.C. The vapor from the solution is condensed in a coadenser. direct contact with water that enters at 50 C. Calculate: a) The heating surface. b) The hourly consumption of live steam. c) Hourly water consumption for condensation.