Calculate the number of degrees of freedom for the mixed-feed, triple-effect evaporator system shown in Figure. Assume that the steam and all drain streams are at saturated conditions and the feed is an aqueous solution of a dissolved organic solid. Also,assume that all overhead streams are pure water vapor, with no entrainment. If this evaporator system is used to concentrate a feed containing 2 wt% dissolved organic to a product with 25 wt% dissolved organic, using 689-kPa saturated steam, calculate the number of unspecified design variables and suggest likely candidates. Assume perfect insulation against heat loss for eacheffect.

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Candenser Steam Pump Feed