Centrifugal Fans – Basic Types and Associated Benefits

There are several different types of centrifugal fans, each with unique design characteristics, performance capabilities, and benefits. Often referred to as blowers, these industrial fans are used for high-pressure applications by a variety of industries, as well as air pollution systems.

These fans work by increasing the pressure of an incoming airstream by turning a series of blades (impeller) mounted on a circular hub. This accelerates the air as well as changes the direction of the air flowing outward, often by 90 degrees. In addition, these fans produce a steady airflow.

Basic Types of Centrifugal Fans

Below are the six most common types of centrifugal fans, each with a unique blade configuration.

• Forward Curved Fan – Also known as a squirrel cage fan due to the wheel type, this fan’s impeller is forward and somewhat small. In addition, the blades curve in the same direction as the rotation of the wheel. Because the impeller, shaft, housing, and bearings are delicately made, there are some limitations for sustainability when used for industrial applications. However, this fan is great for low-speed and low-pressure applications.

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How to Improve Fan System Performance

Specific to air handling units, there are a number of ways to improve the performance of fan systems. In HVAC systems, fans use roughly 40% of all electricity. The problem is that even by following all of the proper procedures in selecting fans for HVAC use, low total efficiency persists. From 2005 to 2009, the Energy Concept in Sweden conducted performance measurements on 767 fans in HVAC systems. While a few of the fans had an efficiency between 50% and 60%, the majority reached only 33% for total efficiency.

For the most part, there is tremendous potential for improving on energy consumption of fan systems. Whether commercial, residential, or industrial fans in Canada, as much as 50% electricity could be saved with a more efficient design, as well as better strategies for control. Below are some examples of how the performance of fan systems can improve.

Variable Frequency Drive – A Variable Frequency Drive (VFD) is designed to adjust the speed of an electric motor based on load. Therefore, the motor speed is reduced and energy is saved. The exact efficiency of the VFD alone varies since the nominal output along with partial load cause the drive to lose between 2% and 5% of torque and speed. However, by implementing a Variable Frequency Drive in many applications, performance improves and energy consumption drops.

Original Source: http://nisco.ca/how-to-improve-fan-system-performance/

Contact Details:
1730 McPherson Court, Unit #35
Pickering, ON
L1W 3E6
Phone No: 905-831-8067
Web: http://nisco.ca/
Email: niscopic@globalserve.com