Can a fan metric save energy?
Because a fan's energy efficiency at a specified operating condition can vary significantly from the fan's peak efficiency, or best efficiency point (BEP), a valuable contribution a metric could make to actually conserving energy would be to influence markets to make more efficient fan selections.
What is a total efficiency fan?
Total efficiency is the purest measure of fan efficiency. Total efficiency is the ratio of air power or energy as delivered by the fan (flow x total pressure) compared to the input power at the fan shaft or impeller required to deliver the specified air power.
What are the requirements for a panel fan?
As a sample of CFM/watt analysis, the fan requirements for an application are specified as 40,000 CFM and 0.125 in wg static pressure. Panel fans of geometric similar design but different sizes were selected with the summary of results shown below in Table 1.
Does a minimum total efficiency threshold affect fan size?
Above 20 inches (~50 cm), the size effect diminishes and efficiencies stabilize and, in general, the size effect becomes insignificant above 40 inches (~1 m) in diameter. Applying a minimum total efficiency threshold as a regulatory approach would, as a consequence, have a disproportionate impact on smaller diameter fans.
What is fan electrical power (FEP) & fan energy index (Fei)?
The second-generation metrics, Fan Electrical Power (FEP) and Fan Energy Index (FEI) are developments that stand on the work of previous fan energy efficiency metrics and advance the technology to include wire-to-air operation and the fan duty point in the metric.
Is there a difference between FEG and fan efficiency?
Significant differences in fan efficiency exist across the operating range of a fan at a single speed. While FEG remains a viable and an accurate measure of a fan's capability to operate efficiently, a significant gap can exist between a fan's capability to operate efficiently and how the fan actually operates when installed.
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