A 98% efficient ESP is to treat a gas stream flowing at 5000 m^3/min. If the effective drift velocity is 6.0 cm/s, calculate (a) the plate area (required and actual in m^2 and (b) the number of plates if each plate is 6 m by 10 m, and there are 3 sections in the direction of flow. Assume that the ESP of Problem 5.1 is built with an actual collection area of 5400 m^2. Now suppose that the actual drift velocity turns out to be 5.0 cm/s and the actual gas flow turns out to be 5500 m^3/min. Calculate the actual efficiency. An ESP must treat 500,000 acfm with 99% efficiency. Assuming an effective drift velocity of 0.4 ft/sec, calculate the required plate area in ft^2, and the number of plates if each is 20 ft tall by 10 ft long, and there are 4 sections in the direction of flow.