Transcription of 5. FANS AND BLOWERS
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5. FANS AND BLOWERS
5. fans AND BLOWERS93 Bureau of Energy EfficiencySyllabusFans and BLOWERS :Types, Performance evaluation, Efficient system operation, Flowcontrol strategies and energy conservation IntroductionFans and BLOWERS provide air for ventilation and industrial process requirements. fans generatea pressure to move air (or gases) against a resistance caused by ducts, dampers, or other com-ponents in a fan system. The fan rotor receives energy from a rotating shaft and transmits it tothe between fans , BLOWERS and CompressorsFans, BLOWERS and compressorsare differentiated by the methodused to move the air, and by thesystem pressure they must oper-ate against. As per AmericanSociety of Mechanical Engineers(ASME) the specific ratio - theratio of the discharge pressureover the suction pressure isused for defining the fans , BLOWERS and compressors (seeTable ).
Compressors more than 1.20 – Centrifugal Fans Airfoil, backward 79–83 curved/inclined Modified radial 72–79 Radial 69–75 Pressure blower 58–68 Forward curved 60–65 Axial fan Vane axial 78–85 Tube axial 67–72 Propeller 45–50 TABLE 5.2 FAN EFFICIENCIES Type of fan Peak Efficiency Range
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