123ArticleOnline Logo
Welcome to 123ArticleOnline.com!

ALL » Business >> View Article

Inline Axial Ventilator

By Expert Author: Susanna Terlitskaia

In a typical axial fan, the effective progress of the air is straight through the impeller at a constant distance from the axis. The primary component of blade force on the air is directed axially from inlet to outlet and thus provides the pressure rise by a process that may be called direct blade action.

The blade force necessarily has an additional component in the tangential direction, providing the reaction to the driving torque : this sets the air spinning about the axis independently of its forward motion.

The air delivering capacity of axial flow fans ranges from 100 to 500,000 cubic feet per minute (3,000 to 15,000 cubic meters per minute). Impellers usually have blades with airfoil cross-sections.

As compared to curved sheet blades, aerofoils can apply greater force to the air, thereby increasing maximum pressure and can maintain better efficiency over a wider range of volumetric flow. Also by increasing the thickness & curvature of the inner sections, the blades can be made stiffer, this limits flutter and allows the impellers to be run at higher speeds.

Once the volume of airflow and the static pressure of the system are known, it is possible to specify a fan. The governing principle in fan selection is that any given fan can only deliver one flow at one pressure in a given system. To select a fan one must consider the following parameters:

- total airflow required

- total operating pressure

- fan installation space

The fan efficiency is defined as the ratio of air power (output) to shaft power requirement (input). An optimally designed fan impeller with improved aerodynamics requires less shaft input power for desired delivery of air volume with total pressure rise as per the system requirement. With reduced shaft power requirement, there is a commensurate reduction in energy consumption.

Thus the fan efficiency is directly contingent upon selection of fan and the operating point relevant to the system resistance.

The way fan impellers (blades or rotors) are designed, the amount of air they can move decreases as the pressure they are working against increases.

The airflow vs. pressure information for a particular fan is called the fan performance data. The performance of a fan depends on the size, shape & speed of the impeller. The fan performance data is essential for selecting fans as per the desired airflow and system pressure.

The airflow through the rig is determined by measurement of the pressure differential and simultaneous readings are taken of the static pressure developed by the fan, air velocity at the exit side, power consumed by the fan driving motor etc.

Fan performance curves and data show how much pressure and airflow a given fan can produce at a given speed. This data is based on the system resistance (pressure) occurring away from the fan. Fan performance curves are developed by fan manufacturers based on the testing of a prototype fan fabricated based on the theoretical design.

The axial flow fans are widely used for providing the required airflow for heat & mass transfer operations in various industrial equipment and processes. These include cooling towers for air-conditioning & ventilation, humidifiers in textile mills, air-heat exchangers for various chemical processes, ventilation & exhaust as in mining industry etc. All the major industries use large number of axial flow fans for operations, such as :

- Power generation

- Petroleum refining & petrochemicals

- Cement industry

- Chemicals & pharmaceuticals production

- Fertilizer production

- Mining manufacturing

- Humidification in textile mills

- building Ventilation, etc..

For additional information please refer to http://www.americanblower.net/RadialBladedFans.html

Susanna Terlitskaia
Industrial Ventilating Engineer
American Blowers Company

Total Views : 53Word Count Appx. : 600See All articles From Author

Business Articles

1. Communicate Anywhere And With Anyone Using A Best Satellite Phone
Author: Tim Austin

2. The Importance Of Safety Handrails
Author: Duraslide Pte Ltd

3. Air Conditioning Repair Los Angeles – Basic Points To Focus On
Author: coryfrank

4. A Regular Eye Exam Is The Key To A Healthy Eyes
Author: Cory Frank

5. Finding A Suitable Moving Company For Your Move
Author: Cory Frank

6. The Wl-250 Tower
Author: Leslie WaterWorks® offers the largest array of bottleless purification and filtration water coolers

7. Properties In Noida
Author: Sanjay Sirohi

8. Find Bgc Condo For Sale With Ease Through This Tips
Author: rokyfernandis12

9. Find Condo For Sale The Easier Way
Author: rokyfernandis12

10. Things To Bear In Mind While Searching For Condo For Sale Fort Bonifacio
Author: rokyfernandis12

11. Fort Bonifacio Condo For Sale At Budget Friendly Rate
Author: rokyfernandis12

12. The Benefits Of Using Iridium Satellite Phones During Emergencies
Author: Tom Austin

13. Find Right Condo For Sale Fort Bonifacio With Ease With This Guide
Author: rokyfernandis12

14. How To Make Life Easier With Edinburgh Taxi Tours
Author: Gordon Gill

15. Signage Melbourne, Australia Offers Affordable Services To Promote Your Brand Through Signage Advert
Author: jackricklomas

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