The author is Managing Director of SEPA EUROPE GmbH in Freiburg, Germany.
The discussions about the nuclear phase-out and the reduction of CO2 emissions have resulted in the need to rethink and intensify the reduction of power consumption on a broad scale. In this context, it has become clear that electronics cooling has great potential for savings.
Larger electronic systems, e.g. for industrial controls or telecommunications, are installed in cabinets that require intensive cooling. The cooling is done by forced ventilation by means of centrally arranged fans. Several fans, usually located at the bottom of the cabinet or in slide-in drawers, draw in cool room air and blow it through ventilation ducts. In the process, the electronics are deheated and the heated air is discharged to the outside.
Such cooling concepts provide for several intelligently arranged fans that are supplied by the AC mains. Unfortunately, AC fan motors are characterized by rather poor efficiency. The power consumption of the fans used for cooling can be up to several KW, depending on the size of the system. The waste heat generated by the fans themselves further worsens the cooling efficiency. DC fans have a much better efficiency, but can only be used if DC voltage is available. The combination of DC fan and external AC/DC converter cannot be used everywhere, mostly for space reasons, and is also less suitable as a replacement solution.
While conventional AC fans require between 0.09 and 0.20W per 1m3 of moving air, depending on the size, this value drops to 0.03-0.06W per 1m3 for DC fans.
With the KAxxx/ADC model series, KAKU introduces a completely new generation of AC fans. The so-called ADC series consists of ball-bearing DC fans with integrated AC/DC converter. In doing so, KAKU engineers succeeded in leaving the fans unchanged in their external dimensions, including the depth. With this new fan series, up to 2/3 (!) of the previously required power can be saved. In addition to the excellent ecological effect, the use of the fans is also economical, since the lower power consumption means that the purchase costs are amortized in a short time. It is therefore not only better to use this series of fans in new plants, but it is also well worth modernizing existing plants.
The ADC series from KAKU already includes almost all standard sizes: 80x80x25mm, 92x92x25mm, 120x120x25mm, 120x120x38mm, 135x135x28mm and 150x172x51mm. Most of the fans have wide range input from 90VAC to 264VAC and are connected by plug-in connector or stranded wires. The standard accessories such as connection cables, protective grids made of metal or plastic and elastic fan mounts can also be used for the ADC series without restriction.