Comparison of High-Pressure Centrifugal Exhaust Fans and Standard Fans

Comparison of High-Pressure Centrifugal Exhaust Fans and Standard Fans

1. For traditional high-pressure centrifugal exhaust fans, the selected airflow and pressure are typically higher than actual requirements. Traditional control methods mostly rely on damper valves. These methods are used for throttle control. While the approach is simple, it artificially increases resistance to achieve the desired adjustment. This is ineffective and results in increased noise. 2. Advantages of high-pressure centrifugal exhaust fans: 1. Automatic control. This reduces labor intensity, shortens system maintenance time, increases production output, and cuts operating costs. 2. Control of motor starting current. Conventional high-pressure centrifugal exhaust fans draw 7 to 8 times the motor’s rated current upon startup, generating heat and shortening the motor’s service life. Using variable-frequency motors reduces maintenance costs and extends service life. 3. Reduces fluctuations in power line voltage. With conventional motors, current surges sharply upon startup, causing significant voltage fluctuations. This can trigger malfunctions or abnormal behavior in voltage-sensitive equipment connected to the same power grid. Variable-frequency speed control allows for a gradual start at zero frequency and zero voltage, thereby minimizing voltage drops and preventing malfunctions. 4. The airflow of high-pressure centrifugal exhaust fans can be adjusted smoothly and continuously. When these fans operate at their optimal operating point, their performance curve aligns more closely with the system requirements, improving efficiency and preventing “surge” phenomena. This stabilizes the pressure inside the furnace and meets the requirements of the operating environment. 5. Low-speed operation reduces wear and noise, extending the service life of both the high-pressure centrifugal exhaust fan and the motor. 6. Energy-saving performance is exceptional. Airflow is proportional to the square of the speed, while power consumption is proportional to the cube of the speed; the energy efficiency of inverter-driven high-pressure centrifugal exhaust fans is also improved.