{"id":15351,"date":"2025-08-18T16:42:02","date_gmt":"2025-08-18T14:42:02","guid":{"rendered":"https:\/\/mag.ebmpapst.com\/en\/?p=15351"},"modified":"2025-08-18T16:42:05","modified_gmt":"2025-08-18T14:42:05","slug":"new-ec-centrifugal-fan-for-greater-power-and-efficiency","status":"publish","type":"post","link":"https:\/\/mag.ebmpapst.com\/en\/industries\/refrigeration-ventilation\/new-ec-centrifugal-fan-for-greater-power-and-efficiency_15351\/","title":{"rendered":"EC centrifugal fan for greater power and effi\u00adciency"},"content":{"rendered":"\n

For some time now, motor and fan specialist ebm-papst has been employing a contin\u00aduous improve\u00adment process in fan tech\u00adnology. In recent years, the centrifugal fans in the RadiPac series specially designed for use in air condi\u00adtioning and venti\u00adlation units have been constantly opti\u00admized, with partic\u00adular emphasis on energy effi\u00adciency, noise reduc\u00adtion, and handling. With the new RadiPac, it has been possible to make another deci\u00adsive improve\u00adment in this successful series. The new-gener\u00ada\u00adtion centrifugal fans work with higher effi\u00adciency levels (Fig. 1).<\/p>\n\n\n\n

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Tracking down sound sources<\/h3>\n\n\n\n

In this article, learn how ebm-papst opti\u00admizes fans in terms of noise gener\u00ada\u00adtion.<\/p>\n\n\n\n

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Fig. 1: The new RadiPac: The new gener\u00ada\u00adtion of centrifugal fans offers higher effi\u00adciency; this results in signif\u00adi\u00adcantly lower oper\u00adating costs. (Graphic | ebm-papst)<\/p><\/div>\n

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Fig. 2: Increase in power density in the new RadiPac compared to the prede\u00adcessor series. (Graphic | ebm-papst)<\/p><\/div>\n<\/div>\n\n\n

Higher speeds ensure a higher air flow and higher pres\u00adsures, meaning that even high-pres\u00adsure appli\u00adca\u00adtions can be covered (Fig. 2). The static pres\u00adsure increase that can be achieved is well over 2000 Pa. In addi\u00adtion, noise gener\u00ada\u00adtion has decreased further; depending on the oper\u00adating point, the noise level is reduced by between 3 and 7 dB(A) compared to the prede\u00adcessor series.<\/p>\n\n\n\n

Impeller: High-strength composite mate\u00adrial, plus inno\u00adv\u00ada\u00adtive geom\u00adetry<\/h2>\n\n\n
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Fig. 3: The mate\u00adrial used is a high-strength, glass fiber-rein\u00adforced composite mate\u00adrial. The injec\u00adtion molding process enables a complex shape. (Image | ebm-papst)<\/figcaption><\/figure>\n<\/div>\n\n\n

To bring about this opti\u00admiza\u00adtion, the impeller plays an impor\u00adtant role. It has been devel\u00adoped according to the latest aero\u00addy\u00adnamic find\u00adings with its five geomet\u00adri\u00adcally sophis\u00adti\u00adcated impeller blades (Fig. 3). A high-strength, glass-fiber rein\u00adforced composite mate\u00adrial is used here. The complex shape is made possible by the injec\u00adtion molding process used. This blade geom\u00adetry dras\u00adti\u00adcally reduces flow losses. The rounded flow contour at the blade inlet and the blade trailing edge, which tapers toward the back, contribute to this. The wavy cover plate leads to an optimal air flow rate through the impeller. The inlet ring is also made of composite mate\u00adrial and is designed for perfect inter\u00adac\u00adtion with the new impeller. The sophis\u00adti\u00adcated impeller geom\u00adetry not only reduces flow losses, but also noise gener\u00ada\u00adtion. When it comes to its strength, the mechan\u00adical design of the impeller also impresses. The edges on the intake and outlet sides are counter-curved, which increases the impeller\u2019s stability. <\/p>\n\n\n\n

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Powerful motors for large fans<\/h3>\n\n\n\n
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The popular RadiPac centrifugal fan product range is already used in many venti\u00adlation, air condi\u00adtioning and refrig\u00ader\u00ada\u00adtion appli\u00adca\u00adtions. A newly devel\u00adoped 24 kW EC motor has once again extended the power spec\u00adtrum. The high-perfor\u00admance drive is installed in RadiPac sizes 710 and 800 with robust metal impeller, enabling air perfor\u00admances of up to 40,000 m\u00b3\/h and up to 2,500 Pa to be achieved.<\/p>\n\n\n\n

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High periph\u00aderal speeds are there\u00adfore easily possible and, depending on the impeller diam\u00adeter, they result in corre\u00adspond\u00adingly high speeds. This has been proven under harsh condi\u00adtions in exten\u00adsive stress and long-term tests. They can be oper\u00adated at maximum speed in a temper\u00ada\u00adture range from -25\u00b0C to +40\u00b0C. Here, the tried-and-tested indus\u00adtrial composite mate\u00adrial meets all the rele\u00advant stan\u00addards, and UL approval is also avail\u00adable if required.<\/p>\n\n\n\n

EC motors: Stronger, more flex\u00adible, and even more compact<\/h2>\n\n\n\n

The driving force behind the new RadiPac centrifugal fans are high-effi\u00adciency EC motors in the power range from 500 W to 8 kW. The inte\u00adgrated EC motors with external rotor design achieve effi\u00adciency levels in accor\u00addance with the require\u00adments for effi\u00adciency class IE5 set out in IEC\/TS 60034-30-2. For reasons of system effi\u00adciency, the drive system consisting of motor and inte\u00adgrated power elec\u00adtronics is indi\u00advid\u00adu\u00adally adapted on each fan, and is opti\u00admized for the respec\u00adtive oper\u00adating range. The newly devel\u00adoped 8 kW drive sets new stan\u00addards.<\/p>\n\n\n\n

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The perfor\u00admance of the inte\u00adgrated elec\u00adtronics has been increased again, even with its more compact dimen\u00adsions.<\/p>\n<\/blockquote>\n\n\n\n

The perfor\u00admance of the inte\u00adgrated elec\u00adtronics has been increased again, even with its more compact dimen\u00adsions. This makes the drive the most powerful in its class at present. Design and func\u00adtion\u00adality have also been updated to the latest gener\u00ada\u00adtion, and upgraded to include a config\u00adurable inter\u00adface \u2013 including the MODBUS-RTU inter\u00adface and inte\u00adgrated reso\u00adnance sensor (see text in box). This reso\u00adnance sensor measures oscil\u00adla\u00adtions and vibra\u00adtions in real time. It can there\u00adfore detect imbal\u00adance due to dirt, for example, and then transmit a message before the fan is damaged.<\/p>\n\n\n\n

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Devel\u00adop\u00adment of centrifugal fans<\/h2>\n\n\n\n
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