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in the vapor space is m. Hg abs. The steam chest has an overall heat transfer coefficient of "F. Water must be evaporated at the rate of 45,000 lb/hr. Neglecting boiling point elevation, what must be the heating surface required? What is the steam economy? 20 pts. 2. A single-effect forced-circulation evaporator is to be used to evaporate 50,000 lb/hr of 50% NaOH solution to 70% NaOH. The pressure at the vapor space is 3 in. Hg absolute. Saturated steam at 70 psig is to be used as the heating medium. It is estimated that an overall coefficient of 700 BTU/hr-ft-F will be obtained. Determine the heat-transfer surface required and the steam economy if the feed to the evaporator is at 200F. 20 pts