Abstract
This article explains how different flow control methods, inlet dampers versus variable frequency drives (VFDs), affect a fan's efficiency and plant operating costs. Case studies provide an understanding of the data required to assess eligibility for fan efficiency retrofits. Opportunities for retrofit are practical when fans are oversized, processes are changed, or equipment is being added to the system. Benefits of energy-efficiency retrofits can be predicted from field studies and a return on investment (ROI) determined. Whether fan casing, ductwork, and existing motors and motor components can be reused is considered in the cost analysis. Rebates and incentives from local utilities that can contribute funding to help provide the necessary returns are also explored. This article compares predicted ROI to actual field results. .
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