Carbon Adsorbers

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Carbon Adsorbers ( carbon-adsorbers )

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Electricity consumed by the system fan is calculated using Equation 1.32, the operating hours per year and the conversion factor from hp to kW: where kWhsf 0.746kW2.50104QPsS hp Pinches waterP 1t 0.03679v 1.107104v21 sbbbb (The latter expression was derived from Equation 1.30, assuming that the carbon used in this example system is Calgon’s “PCB,” 4 x 10 mesh size.) By assuming a carbon bed density, of 30 lb/ft3, Equation 1.31 can be used to calculate the bed thickness (tb): Thus: And finally: BedThickness t 0.0333M'c 1.8ft Ab P 11.800.03679751.107104 7527.09inches b b kWhsf  0.746  2.5  104  7.09in.  10,000 acfm 8,640h / yr  114,200kWh / yr Bed drying/cooling fan: During the drying/cooling cycle, the pressure drop through the bed also equals Pb. However, as Section 1.6.1.3 indicates, the flow and operating time are different. For the air flow, take the midpoint of the range (100 ft3 air/lb carbon) and divide by 2 hours (the bed drying/cooling time), yielding: 100 ft3/lb x 3,600 lbs x 1/120 min = 3,000 acfm. Substituting this into Equation 1.32 results in: 2.50  10 4  7.09 inches  3,000 acfm  5.32 hp From Equation 1.33, we get: Thus: cf 0.45h28,640h2,880h 12h kWhcf  0.746kW  5.32hp  2,880h 11,430kWh / yr hp 1-41

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