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post #18 of Old 02-05-2013
RichH
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Re: Flash Evaporation?

TwoD ... if you dont thoroughly demineralize and pretreat, the Coefficient of Ht transfer drops from an idealized 400 U(f) to about 50-80 U(f) due to fouling ... that drop in Heat transfer coefficient is pretty much indirectly proportional to the needed surface area of transfer, to cover the expected fouling. Flash evaporator 'may' produce equal purity or even better purity ... but not when fouled, especially when operated in sea water and the coefficient of heat transfer becomes severely limited by the high fouling.
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