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Quiz11_Spring08 - -I O e ~ ~ l Z o,~ C t> ls oO Hx 2 F l...

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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 ofwater 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 ofwater evaporated per metric ton of steam equal 0 . 85 X 2 , where X isthe number of effects, determine the optimum number of effects for minimum annual total cost
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