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(45) Finding the Pressure Drop for a Water Deionization System Water at room temperature is to be treated in a large dual-packed-bed deionization circuit as shown on the next page. The two packed beds and their associated piping are identical. Calculate the pressure drop required to pump 100 L/min of water upward through the system when: a) (25) both valves are fully open (so half the water flows through each side) b) (20) one valve is fully open and the other is fully closed Data: All pipe: smooth, 2.54 cm ID All elbows: 90 standard radius Bed packing: spherical resin beads, 2 mm diameter, 35% porosity Water data: p = 997 kg/m n = 8.57 x 10 kg/m/s Hints: Fully open ball valves may be ignored Take the tabulated friction loss value once for each tee in both cases Ignore expansion and contraction at the ends of the packed beds Rearrange Ergun's equation into a friction loss (E) term for this problem This problem is easier to solve if you break the friction loss into three parts: 1) Piping before and after the tees (including the first tee) - this flow doesn't change between parts a) and b) 2) Piping between the tees (including the second tee) - this flow changes between parts a) and b) 3) The packed beds You only need to consider one packed bed and its associated piping, even in part a). Just be sure to adjust the flows accordingly