They can also be flexibly mounted with horizontal or vertical motor shaft. Sizes 630 and larger feature a stackable cubic design with clear installation benefits for the user, safety during transport, and less packaging waste. They also thought about practical ways to transport and install the fans. Squaring the circle – practical cubic design This reduces the deflection and pressure losses when the fan is installed in an air conditioner (Fig. They achieved a further reduction in the pressure losses at the inlet and also improved the outflow characteristics with the trailing edge and the integrated radial diffusor. The RadiPac Airfoil impeller is now both lighter and stiffer. The airfoil aluminum blades in the impellers result in greater efficiency (Fig. The flow diagram at the right shows the pressure distribution low pressure is shown in blue and high pressure in red. And they adjusted the motor’s position in the impeller to achieve a good compromise between compactness of the complete fan unit and the most aerodynamically beneficial location for the motor in the impeller.įigure 2: Starting with size 310, the impellers have the new airfoil aluminum blades for improved efficiency. They designed the inlet ring for the impeller and its aerodynamically optimized blade channel. With this goal in mind, the engineers at ebm-papst have performed a complete aerodynamic optimization of the RadiPac fans, focusing on the air inlet, the motor’s position in the impeller, the blade profile and the impeller air channel. Besides its motor, a fan’s impeller, its housing and even its conditions of installation have to be considered when analyzing the energy situation, if all potential for saving energy is really to be realized. But greater motor efficiency is no guarantee of an equally high overall system efficiency. The efficiency of the motors is already well above the values called for by the IE4 efficiency class. With drive power from 500 watts to 12 kilowatts and sizes from 250 to 1,000, air performance of up to 40,000 m³/h can now be achieved. Figure 1: Having established itself in the market, the RadiPac series of centrifugal fans is adding new models again.
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