A fan curve helps you rate a fan's efficiency.
Rating a fan's efficiency is a difficult task. Fluid dynamics and vector analysis are scary terms, yet they are the fields involved in describing the flow of air, which is what you need to understand to determine how the fan affects its surroundings. Fortunately, a fan curve is a simple diagramming method that demonstrates the relationship between air pressure and the cubic feet per minute a fan moves. These factors interact with the rate of electric consumption, the fan's rotational speed, and the size and shape of surrounding open space.
Instructions
1. Look through the manual that came with your fan. Many fans nowadays are advertised with their fan curve, as it demonstrates the efficiency and options for operation optimization quite succinctly. If this is not available, find the data giving the number of cubic feet per minute the fan is expected to push, and how the fan's surroundings affect its efficiency.
2. Determine the type of fan that you have: radial, mixed-flow, diagonal or axial.
3. Trace a graph similar to the corresponding curve in Figure 5 on the ebmpapst website.
4. Estimate the scales on the axes by using the data you found in your fan's user manual. If all you could find is one number for the cubic feet per minute it can move, place this value on the X-axis at somewhere less than half but above a third. This is the maximally efficient point of operation for most fans. Label the X-axis "CFM," and note the rest of the X-axis' scale with values appropriately scaled from zero at left, through the optimum point, and extrapolating upward for the rest of the axis.
5. Label the Y-axis with pressure. Mark the points as percentage points, or fractions of 1. These roughly correspond to the percentage of the maximum pressure the fan can withstand and still operate. If you have data on how operating temperatures or other pressure-related factors influence the CFM of the operating fan, you can incorporate this into your graph. Higher temperatures have lower pressures, for example.
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