Breakthrough in Higher Efficiency at Lower Operating Noise - Fans with Diffuser Reduce Their Discharge Losses

In refrigeration and cooling installations, heat exchangers are used to dissipate the waste heat that is generated into the surrounding air. To improve their dissipation capacity, fans force cooling air through the heat exchanger. For such fans, there are various design and configuration options to make them especially efficient, quiet and to increase their service life. A new, passive component, the so-called diffuser, makes for a substantial improvement in efficiency and noise.

Its pressure-boosting effect minimises these discharge losses and makes it easier to adjust the fan to commercially available heat exchangers.

As we all know, a medium can only absorb a certain amount of heat energy for each degree Kelvin. Therefore, possible temperature difference and the amount of heat to be dissipated both define the volume of the cooling air flow that is required. This is the air any such fan has to force through the heat exchanger under consideration. Because refrigeration systems are usually operated with long duty cycles, it is all the more important to make economic use of the input power, as every additional watt increases your costs. Using a suitable fan impeller design creates your required air flow. Naturally, flow separations and backflows need to be avoided as they cause energy losses and additional bad noise. Not surprisingly, all fan manufacturers are aware of this and offer more or less suitable solutions. Now, however, ebm-papst as the leading manufacturer of motors and fans, has decided to take this one decisive step further: Using a diffuser substantially reduces the losses normally experienced once the impeller has discharged the air.

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