Surface Area and Steam Consumption of an Evaporator. A single-effect evaporator is concentrating a feed solution of organic colloids from 5 to 50 wt %. The solution has a negligible boilingpoint elevation. The heat capacity of the feed is cp = 4.06 kJ/kg · K (0.97 btu/lbm · °F) and the feed enters at 15.6°C (60°F). Saturated steam at 101.32 kPa is available for heating, and the pressure in the vapor space of the evaporator is 15.3 kPa. A total of 4536 kg/h (10 000 lbm/h) of water is to be evaporated. The overall heat-transfer coefficient is 1988 W/m2 · K (350 btu/h · °F). What is the required surface area in m2 and the steam consumption?