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38mm DC fans provide 3 times the cooling of AC counterparts |
01/10/2003 |
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The ADDA range of 80mm DC fans, now available in 38mm thickness as well as 15, 20 and 25mm, will prove a powerful upgrade for the popular 80 x 80 x 38mm AC fans that are used extensively in the electronics industry.
Because the fixing holes are set at the same distance, the DC fans take up exactly the same space, require no mechanical fixing changes and yet offer vastly improved performance and greater operating flexibility.
A DC fan of this size can operate at 4,000 rev/min and is capable of airflow of over 29 litre/sec (61.7CFM). This is compared to 11.3 litre/sec (24CFM) delivered from a similarly sized AC fan that has its speed limited by the AC frequency to typically 2,750 rev/min.
Apart from the increased fan speed, another reason for improved performance is that, because of the increased efficiency of the motor, the hub is smaller and therefore occupies less of the total annular area thus allowing increased airflow.
In addition, speed control is possible simply by varying the input voltage making them suitable for use in intelligent cooling systems that are required to cool complex electronic systems. |
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