Fan Noise Calculator

However there is a problem measuring the sound power level l w of a fan.

Ceiling fan and lamp. Engineering toolbox resources tools and basic information for engineering and design of technical applications. Fig 2 shows the pressures through a fan each of which is described below. Scientific online calculator.

A selection of free web based applications to assist you with your noise assessments calculations and reporting. Variable airflow applications can also cause noise problems. A common mistake is to use a fan that is too small or too large for the application so that it cannot be run at its most efficient point.

In order to determine fan noise sound power level l w is what the acoustic engineer needssomething that is constant all the time no matter what the fans operating environment might be. Fan noise 7122000 113 noise comparison for lowest noise output fans should always be operated near their peak efficiency point. You can include this effect if you wish by using the following formula.

Noise or sound generated by a fan depends on the motor power volume capacity static pressure and discharged volume. P p v2r use if the direction of. For sources of significant size sound pressure levels must be input at source to receiver distances large enough to be sufficiently in the far field where inherent directivity is minimalfor a broadband source this is where the distance is greater than the longest dimension of the source.

Decibel db and sound level calculators. Is the static pressure on the inlet side of the fanthis should also include the velocity pressure on the inlet side if known that is constant and in line with the fan.