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You are operating a fan with the characteristics shown in the figure below. The 30 kW...

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Mechanical Engineering

You are operating a fan with the characteristics shown in thefigure below. The 30 kW fan currently operates continuously at fullspeed with the flow reduced to 90% of its rated capacity usingdownstream dampers. An evaluation reveals that there is inadequatefresh air being introduced into the building during the day, andtoo much is supplied at night. The flow rate needs to increase to100% from 7am to 6pm, and can be reduced to 50% at night. Whatwould be the CHANGE in energy consumption per year if this changewas done using either downstream dampers, or using a 97% efficientVSD.
• ηmot = 0.96 at the nominal speed
• ηmot = 0.94 at 90% of the nominal speed
• ηmot = 0.89 at 50% of the nominal speed

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