Other Factors

Generally, particle size is the most important factor in the selection of a collector since the range of particle sizes to be collected strongly affects the expected cost and efficiency. In some instances, other factors such as serviceability or the pressure drop across the collector are the most important factors. Table 5.15.1 lists the characteristics of various particulate removal equipment and compares some of these features. For the most part, the collection devices that are the least expensive to install and operate are also the least efficient.

Table 5.15.2 also compares the collection characteristics and total annual costs of various air cleaning equip-

FIG. 5.15.1 Molecular and aerosol particle diameters, copyright © P.C. Reist. Molecular diameters calculated from viscosity data. See Bird, Stewart, and Lightfoot, 1960, Transport phe-nomona, Wiley. (Adapted from Lapple, 1961, Stanford Research Institute Journal, 3d quarter; and J.S. Eckert and R.F. Strigle, Jr., 1974, JAPCA 24:961-965.)

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FIG. 5.15.1 Molecular and aerosol particle diameters, copyright © P.C. Reist. Molecular diameters calculated from viscosity data. See Bird, Stewart, and Lightfoot, 1960, Transport phe-nomona, Wiley. (Adapted from Lapple, 1961, Stanford Research Institute Journal, 3d quarter; and J.S. Eckert and R.F. Strigle, Jr., 1974, JAPCA 24:961-965.)

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