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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 ).

Major types are: centrifugal blower and positive-displacement blower. Centrifugal blowers look more like centrifugal pumps than fans. The impeller is typically gear-driven and rotates as fast as 15,000 rpm. In multi-stage blowers, air is accelerated as it passes through each impeller. In single-stage blower, air does not take many turns, and ...

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2. BOILERS

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