Quiz11_Spring08 - -I) ) O e ~ ~ l Z . o ,~ C t>...

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CREE 5369 / 6369 Quiz # 11 (closed book) Tuesday April 15, 2008 ~ A multiple-effect evaporator is used for evaporating 200 metric tons of water per day from a salt solution. The initial cost for the first effect is $ 20,000, and each additional effect costs $ 15,000. The service life of the evaporator is estimated to be 5 y ears with no salvage v alue . Fi x ed charges excluding depreciation are 15 percent . y early, based on the first cost of the equipment . Steam costs $ 3 ~ 16per metric ton. Annual maintenance charges are 5 percent of the initial equipment cost . The unit will operate 300 days per year. If the metric tons of water evaporated per metric ton of steam equal 0 . 85 X 2 , where X is the number of effects, determine the optimum number of effects for minimum annual total cost . E t · C O ":> t - : : . ( 20 , C d O + \ S060( ,r
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This note was uploaded on 04/13/2011 for the course CHEE 5369 taught by Professor Alim during the Spring '11 term at University of Houston.

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