How to calculate the mechanical efficiency of a centrifugal fan?
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The mechanical efficiency of a device measures how well it converts input power into usable output. Similarly, the mechanical efficiency of a fan measures how well the impeller’s kinetic energy (or the brake horsepower available at the impeller shaft) is transformed into the total energy of the air stream (or the total pressure of the air stream).
Mech.Efficiency=(Total Pressure(Pa)×Volume Flow rate(m3/s))/(Brake Horse Power)
Since total pressure is involved, the mechanical efficiency of a fan is also known as total efficiency.