123ArticleOnline Logo
Welcome to 123ArticleOnline.com!

ALL >> Education >> View Article

How To Improve Fans Performance

By Expert Author: Susan Terlitski

Even in large fans, a sixteenth of an inch of material build up can reduce performance. Centrifugal fans will move some air even when running backwards. While some types would use so much horsepower they would trip circuit breakers, other design s could run for years without being detected. Fan components may be out of position due to routine cleaning or painting or the wheel could have shifted during shipment. For backward inclined fans, the relation of wheel to inlet cone is very critical. Even a quarter of an inch can have a major impact. The fan’s installation and maintenance literature shows the proper positioning of the wheel to the inlet cone.

Industrial processes and plant ventilation systems often need more air than originally designed. Increased production requirements, process changes, and facility renovations are a few of the major reasons. Additionally, the lack of adequate maintenance over time can negatively impact system airflows. This article discusses several procedures that can increase airflow. Often airflow can be increased by adhering to proper fan maintenance procedures as outlined in fan installation and maintenance literature.

The design and maintenance of the system plays a large role in achieving the overall desired performance. Visual inspections often reveal some easily rectified problems that can significantly impair performance. If the system has not been properly maintained, clogged filters or obstructed coils will reduce airflow. The greater the obstruction, the greater the loss in airflow. Any leaks in the ductwork will contribute to reduced perfo rmance, especially leaks around plenum bulkheads that can lead to recirculation of air. Worn flexible connectors are a common source of leaks and should be inspected regularly. If the damper linkage is out of adjustment, the damper may not be opening completely, thereby reducing performance. If inlet dampers are used, make sure they are installed so that the air is pre-spun in the same direction as wheel rotation. For all dampers, make sure there is sufficient clearance for the blades to open and close completely without hitting the ductwork or other system components. Last, for systems with either pneumatic or electric controls, make sure damper actuators are operating properly. Sharp changes in the direction of airflow at either the fan inlet or outlet will disrupt the flow through the fan and impair performance. If it is impossible to straighten the ductwork entering and leaving the fan, the use of inlet boxes and turning vanes can minimize performance losses.

One of the easiest solutions to low airflow problems is speeding up the fan. While airflow is increased by speeding up the fan, so too are static pressure, noise, and power requirements. Therefore, while increasing the fan’s speed is an easy procedure with low first cost, the additional operating expense over time makes it the most costly solution. When increasing fan speed, it is necessary to check the maximum safe speed of the fan and make sure the motor is capable of the horsepower required to run the fan at the new speed. But never run a fan beyond its maximum safe speed.

On a first-cost basis, adding or replacing fan equipment is the most costly alternative. However, on a life-cycle-cost basis, considering operating and maintenance expense, it can be the least expensive, as compared to increasing the speed of an existing fan. Sometimes a second fan may be added, either in series or parallel with the original, although it may be more cost effective to simply upgrade the system with a new fan capable of the required airflow and pressure. Adding another fan in series will increase the airflow because of the additional pressure. The operating point of the new system moves further out/up the system curve. Where duct size is adequate to handle the desired amount of air but the existing fan doesn’t provide sufficient pressure, a second fan in series may be the best solution. However, make sure the ductwork can handle the increase in pressure. Adding another fan in parallel with the first will increase airflow due to the combined capacities. Because capacities are being combined instead of pressures, a greater increase in airflow will result for a given system. However, system pressures will also increase and caution is required to avoid the unstable operating area of the combined fan system.

When more air is required it is important to investigate the system on a step-by-step basis, considering the least expensive possibilities first. For existing systems that seem to have lost performance, fan and system maintenance is the place to start. Often, simply improving the efficiency of existing components will suffice. For systems that require greater airflow and / or pressure, increased fan speed is generally the first alternative. However, when large increases in performance are required, there may be no alternative but to purchase a larger fan.

For additional information please refer to http://www.canadablower.com/blowers/index.html

Susan Terlitski
Fan / Blower Engineer
canadablower@canadablower.com
Canada Blower Co.
http://www.canadablower.com/oem/index.html
http://www.canadablower.com/fans/index.html

Total Views: 59Word Count: 806See All articles From Author

Education Articles

1. Aws-solution-architect-associate Exam Dumps /all Q&a – Amazondumps.us
Author: amazon dumps

2. Myob Assignment Help- Promising You To Successfully Complete Your Myob Assignments
Author: onlineassignmentexpertt

3. Five Reasons For Studying Ayurveda In India
Author: anil kumar

4. Tips To Prepare Well For Hotel Management Entrance Exam
Author: Mahender Rana

5. How To Cope With The Subject That You Hate The Most?
Author: Instant Essay Writing

6. The Education Conferences Australia
Author: stevewiliamcro

7. Makeup Artist As A Career And Scopes In India
Author: anil kumar

8. Sap Certified Development Specialist – Sap E_hanaaw142 Exam Material
Author: Robert hoover

9. The Essentials Of The Ideal Geometry Box
Author: Vijay Singh

10. Designing Hpe Backup Solutions Hpe0-j80 Exam Preparation
Author: James Stiles

11. Delta Storage And Backup Solutions Hpe0-j78 Exam Question
Author: James Stiles

12. Proliant Server Solutions Hp0-s45 Exam Question
Author: James Stiles

13. How Self-paced Learning Is Changing The Way “typical Learning” Works
Author: Multisoft Virtual Academy

14. Microsoft Project - Learn Effective Project Management Skills To Attain Career Growth!
Author: Multisoft Virtual Academy

15. What All Matlab Online Training Offers And Should Anyone Learn It
Author: Multisoft Virtual Academy


Login To Account
Login Email:
Password:
Forgot Password?
New User?
Sign Up Newsletter
Email Address: