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Learning About Cyclones


:: Section 7

Pressure Drop and Power

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Since impaction relies on the flow velocity, a higher efficiency is the result of a higher flow velocity. However, a higher flow velocity is accompanied by a higher pressure drop across the system that can be translated into cost as a more powerful fan is required. The pressure drop can be determined by:

Pressure drop equation

where ρg is density of gas and NH is number of gas inlet velocity head. The pressure drop for a general purpose, a medium efficiency or a high efficiency cyclone is typically 2-4, 4-8 and 8-10 inch H2O, respectively. The power requirement (Wf) can then be determined according to:

Equation for the power requirement

The total cost is related to the power as

Equation for the total cost as related to power

where TC is total cost and $ is unit electricity cost.