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

You are operating a fan with the characteristics shown in the figure below. The 30 kW fan currently operates continuously at full speed with the flow reduced to 90% of its rated capacity using downstream dampers. An evaluation reveals that there is inadequate fresh air being introduced into the building during the day, and too much is supplied at night. The flow rate needs to increase to 100% from 7am to 6pm, and can be reduced to 50% at night. What would be the CHANGE in energy consumption per year if this change was done using either downstream dampers, or using a 97% efficient VSD.

• 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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samet mamat answered 1 year ago

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