Blower power calculation – Blower types and efficiency

Table 1. Overview of blower types for aeration of wastewater (– USEPA, 2010)
image002table

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 inlet guide vanes and variable diffuser vanes) 70-80 45
Single-stage centrifugal, gearless (high speed turbo) 79-80 50

Note: values may vary depending on the application

 

© Seong Hoon Yoon