Question: QUESTION 2 A forward-feed double-effect evaporator with equal heating areas in each effect is fed with 6 kg/s of a liquor of constant specific heat

QUESTION 2 A forward-feed double-effect evaporator with equal heating areas in

QUESTION 2 A forward-feed double-effect evaporator with equal heating areas in each effect is fed with 6 kg/s of a liquor of constant specific heat 4.2 kJ/kg.K, and with no boiling point rise in each effect, so that half of the feed liquor is evaporated. The overall heat transfer coefficient in the second effect is three-quarters of that in the first. Steam is fed in at 400 K and the boiling point in the second effect is 380 K. The feed is heated by an external heater to the boiling point in the first effect. Assume that heat transferred in both effects is equal. (a) Sketch the process and locate different variables listed above within the evaporator setup. (6) (b) Calculate the steam consumption (30) TOTAL /36/

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