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Determine the heat- transfer area

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Reference no: EM13882037

A 10 wt% aqueous solution of NaOH at 100°F and a flow rate of 30.000 lb/h is to be concentrated to 50 wt% by evaporation using saturated steam at 115 psia.

(a) If a single-effect evaporator is used with U 400 Btulh-ft2-°F and a vapor-space pressure of 4 in. Hg, determine the heat-transfer area and the economy.

(b) If a double-effect evaporator system is used with forward feed and U = 450 Btu/h-ft2-°F and 112 = 350 Btu/h-ft2-°F, and a vapor- space pressure of 4 in. Hg in the second effect determine the heat- transfer area of each effect, assuming equal areas, and the overall economy.

Reference no: EM13882037

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