Calculating Fan Power & Efficiency: What Data do I Need?

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SUMMARY

To calculate fan power (kW) and efficiency, one must utilize the flow rate and the static/total pressure across the fan surface. The conservation of energy principle is essential, where the work input equals the change in internal energy plus the change in kinetic energy. No additional data is necessary beyond these parameters for the calculation.

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  • Understanding of fluid dynamics principles
  • Knowledge of conservation of energy in mechanical systems
  • Familiarity with fan performance metrics
  • Basic calculations involving power and efficiency
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Engineers, HVAC professionals, and anyone involved in fan design or performance optimization will benefit from this discussion.

novice_user31
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Hi,

How do I calculate the fan power (kW) and efficiency, given the flow rate, static/total pressure across the fan surface? Do I need more data?

Thnx in advance.
 
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Nope.

Hint, write out a conservation of energy.

Work in = change in internal energy + change in kinetic energy + change in potential energy (assume zero).
 

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