Motor efficiency

Electric motors are responsible for 90 percent of the electric energy consumption in a typical wastewater treatment plant.(WEF 2009, — USEPA 2010).┬á Motor efficiency () is a measure of mechanical power () output compared to electrical power input (). ┬á ┬á┬á┬á┬á┬á ————————————— (1) where ┬á= mechanical power output (W or hp) = electrical power input […]

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Blower power calculation – Blower types and efficiency

Table 1. Overview of blower types for aeration of wastewater (– USEPA, 2010) Table 2. Typical efficiencies (– USEPA, 2010) Blower Type Nominal Blower Efficiency (%) Nominal Turndown (% of rated flow) Positive displacement (variable speed) 40-65 50 Multi-stage centrifugal (inlet throttled) 50-70 60 Multi-stage centrifugal (variable speed) 60-70 50 Single-stage centrifugal, integrally geared (with […]

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