3 things done to improve efficiency of super efficient fans
Many people believe that BEE 5 star rated fans deliver less air and using the same may not give similar comfort as a regular fan. BEE 5 star rated fans have minimum air delivery of about 210-220 CMM whereas regular fans have the value of 250 CMM. Air delivery depends on blade pitch, blade shape and size, speed and power of motor used in fan and height of fan from ceiling. Regular fans are rated at 75 Watts, but the new fans are rated at 50 Watts (30% savings). In fact some BEE 5 star rated fans are also rated at about 45 Watts. Thus, there is clear cut saving.
The new super efficient fans that are available in the market use a different type of electronic motor, which is also called Brushless DC (BLDC) motor. Conventional ceiling fan consumes about 75 Watts of power for 1200mm sweep. This new technology with efficient blade designs makes ceiling fans far more efficient, and the fans consume 28-35 Watts of electricity, which is about 50% less than the old regular fans. Some of such ceiling fans have air delivery of about 230 CMM that makes them almost the same in performance as compared to the regular ceiling fans.
There are 3 things that are done to improve the efficiency of fans in super efficient fans:
1. Performance is improved by improving the induction motor
2. Use of BLDC (or Brushless DC technology)
3. Improving the design of the blades.