Feed to a cooling crystallizer is 2,000kg/h of 30wt%Na2SO4 in water at 40C. This solution is to be cooled to a temperature at which 50% of the solute crystallizes as decahydrate. Estimate th required heat-transfer area in m2 if an overall heat-transfer coefficient of 15Btu/hft2F can be achieved. Assume a constant specific heat for the solution of 0.80cal/gC. Cooling water at 10C flows counter-currently to the solution, and exits at a temperature that gives a log mean driving force of at least 10C. Table 17.5 Solubility and Heat of Solution at Infinite Dilution of Some Inorganic Compounds in Water (a Positive Heat of Solution Is Endothermic)