Frequency inverters for motors in the exhaust air treatment of metal recycling pay off. Energy savings of more than 50 % can be achieved here. This is because the energy consumption of applications such as pumps and fans depends heavily on the speed of the motor. If this is reduced by 20%, for example, energy costs can be halved. And this is also necessary due to high electricity prices and stricter environmental guidelines such as the Energy Efficiency Act (EnEfG) or the Technical Instructions on Air Quality Control (TA Luft).
The energy consumption of pumps and fans depends heavily on the motor speed
Energy Efficiency Act stipulates more efficient systems and fewer emissions
Reduce energy costs in exhaust air treatment by more than 50 % with frequency inverters
A calculation example: A fan is operated with a motor output of 110 kW. The assumed electricity cost is €0.1665 per kWh, with 250 operating days and 10 hours of operation per day. For simplification, it is assumed that the fan operates at an average of 80% of its maximum drive power.
With regulated speed, energy costs are reduced by approximately 49% compared to network operation (bypass) and around 41% compared to operation with a throttle. According to the calculation below, this results in an annual electricity cost savings of € 22.344 and € 16.392 respectively.
