Fan Eficiency Improvements

ASL recognise airside performance is most important in consideration of cooling efficiency and offer specialist technical advice in Fan Efficiency Improvements.

Tip Clearance

The radial clearance between fan rotor and fan ring is critical in both pressure and airflow capability. The maximum effect in deterioration of performance is felt towards conditions of maximum pressure development typically as the tube fins become airside fouled.

The primary reason for close tip clearance is to minimise air loss or leakage at the tip and re-circulation around the fan blade resulting in reduced efficiency.

Pressure loss as a direct result of increased tip clearance is clearly illustrated by adjacent graph. In practice the limitations of this clearance are those imposed by mechanical design and production tolerances.

However operating conditions may be significantly improved by fitting of tip seals to eliminate the presence and effect of excessive tip clearance ASL offer supply and installation as part of our fan maintenance service programme.

Fan Testing

To establish the optimum blade angle setting for maximum airflow it is necessary to complete a fan test. By this process we characterise actual fan performance and establish the optimum blade angle for maximum airflow within the capability of the fan and motor.

The fan characterisation graph clearly illustrates the impact on power demand, which continues to rise with increase in blade angle. The often made assumption that optimum fan performance is archived by maximising available motor is not necessarily the case it is therefore most important when considering optimisation a fan test is undertaken. ASL recognises this other issue relating to fan efficiency and provides an inspection and performance testing service.

Significant improvement in operational efficiency may be gained from replacement of old fan rotors new modern units incorporating all latest technology to meet individual customer requirements at very competitive prices.

Best practice is to insure specification for modification and or replacement of fan ring include an integral inlet flare. For further information and assistance please contact us direct.