Nový premixový ventilátor ebm-papst
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01.04.2008
With the new NRG137 fan, ebm-papst is expanding the product range up to 150 kW.
Modern compact gas heaters are based on the principle of condensing boiler technology. They are known for their good energy utilization and compact dimensions. While condensing boilers once were more common in the lower power range, systems with up to 120 kW now exist as wall units which, due to the space conditions, require power-optimized, compact fans. A newly developed gas blower with optional integrated venturi mixer for heat output up to 150 kW is a response to this trend. Compact condensing boiler systems are often installed close to the consumer. Naturally, this proximity makes noise emissions especially bothersome. For this reason, motor and fan specialist ebm-papst Landshut has had a new, compact gas blower family with minimum operating noise on the market since 2006. Now, the product range is being expanded up to 150 kW with the new NRG137 fan (image 1). All of the main dimensions and flange dimensions have been taken over from the predecessor model RG148, making replacement for increased power or efficiency easy. Efficiency in heating is a combination of several different aspects. One, of course, is the efficiency of the heater itself-optimum fuel utilization. However, the space requirements-the power density of the heating system-are likewise important. Factors such as noise emission and low electrical input capacity also play a role. The new gas condensing boilers with the new NRG137 have been designed with these requirements in mind.
Optimized aerodynamics Perfect aerodynamics is the specialty of the Landshut-based manufacturer. Therefore, the new blower includes a few aerodynamic improvements that allow it to attain the same performance data as the predecessor model RG148 at lower speeds. The new blower can provide a performance increase of up to 20% (image 2). A particularly useful feature is the optional integration of the venturi mixing nozzle into the blower (image 3). Instead of building the mixer from several different parts and retrofitting it on the fan, users now can cover the entire desired power range with a single, flow-optimized injection-molded insert. This saves costs and improves the effectiveness of the heating system.
Compact technology The aerodynamically optimized fan can be used for significantly higher heating capacities and thus also requires a higher drive output. To achieve this goal, the motor technology underwent a major overhaul. The manufacturer attains the added output with the predecessor type's tried and true electronically commutated motor. However, the critical break from the past is the new, microprocessor-controlled drive electronics. They not only substantially improve the power output, they also reduce motor noise. As a result, the new condensing blower runs significantly more quietly than the predecessor model, although the rated output is higher. The supply voltage is 120 VAC or 230 VAC and thus is also suitable for worldwide use.