#Rooffan

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Axial fans features

Axial fan was invented in Britain in the first half of XVIII century. John Baron created the first prototype of this fan in 1830.

Classification

This list includes: - wall-mounted;

- ceiling fan;

- roof fan;

- window fan;

- desktop fan;

- tower fan;

- other (cooler, cooling in cars etc.).

Main technical values

Axial fans are characterized by the following parameters: - rotation direction (left or right); - number of blades (from 3 to 7); - blade shape (flat or curved in two directions); - engine power; - impeller diameter; - case type. Operating temperature range varies from + 40 to -40 degrees. These fans good provide suction and blowing air. Radial (centrifugal) fan is more effective for blowing air, but it worse sucks air. Using the both types provides the active air circulation. Many models have a reverse mode. But the efficiency in this mode is lower by about 30-40%. The air flow direction coincides with the axis of impeller. It's located on the motor axis. Domestic axial fans have a small capacity. Powerful industrial models provides an airflow of up to 50 Pa and are well suited for supplying large air volumes. But aerodynamic resistance of this system should be relatively small. For example, channel-free ventilation systems use these fans very often. Systems with a small length of air duct,for example, in bathrooms, shower rooms or in offices also often use these fans. The axial fan contains housing, an axial impeller with blades and the engine. The impeller closes by the cylindrical housing. Rotating blades direct air axially. Airflow almost not spreads in the radial direction. The blades most often are mounted directly on the motor shaft. Some models have a collector before the impeller. It focuses the airflow for improving the fan aerodynamics. Blades tilt angle easy adjust the airflow direction.

Conclusion

The list of main pros includes: - compact size; - rotation control; - low power consumption; - low noise level; - easy to use; - high efficiency compared to other types; - low cost and ease of design; - long service life. - reliable protection of the motor against overload, sparks and moisture. Of course, these factors should be taken into account when choosing the optimal fan. In-line axial fans are ideal for air supply and extraction ventilation in the industrial and administrative buildings. Many models additionally cooled further the air. This video demonstrates the operation of an axial ceiling fan with adjustable rotational speed and blade length. Read the full article

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How to choose a fan

Fans are mainly designed to cool various devices with blowing or for ventilation. Modern fans can be classified according to operating conditions, working pressure, installation, ways of connecting to the engine and creating excess pressure.

Classification

Operating conditions Conventional models work in an inactive gas environment at temperatures up to 80 degrees. Heat-resistant fans operate at temperatures above 80 degrees. Corrosion-resistant models can work in an aggressive environment. Explosion-proof fans are used in industry. Dustproof models operate in a dusty environment with a solids content of more than 0.1 grams per cubic meter. Working pressure - low pressure (working pressure up to 1 kPa); - average pressure (working pressure from 1 to 3 kPa); - high pressure (working pressure from 3 to 12 kPa). Installation - Normal. These fans use base, frame, etc for mounting. - In-line fan. These fans have a cylindrical body with fixings for installation in the duct.

- Roof fan. These fans have weatherproof body and used for ventilation of premises.

Models for cars are also very popular.

Connection to the motor Modern models use direct connection of the impeller to the motor, a continuously variable transmission or V-belt drive.

Operation principle

Axial models are most commonly used as household fans. For example, popular ceiling fans refer to the axial type.

Radial or centrifugal fans have usually much more power and often are used in industrial premises.

Diagonal fans contain asymmetrical cranked housing and impeller of the drum type.

Unsymmetrical impeller arrangement provides the formation of air flow in the direction of smaller section. But the diagonal fans with wide wheels create a high pressure even at low radial impeller speed. Unfortunately, they have a relatively low efficiency. In recent years, the popularity of mixed type axial centrifugal fans has grown. Especially often these fans are used for domestic and semi-industrial systems with round ducts. Special design provides air flow direction along the axis under the influence of centrifugal force. Such fans have a relatively small size and provide a good pressure. Therefore, they are often used in the long-distance air ducts. Ventilation systems of apartments, offices, houses, industrial enterprises, etc use powerful fans. Their high performance provides circulation of a large air volume and reaches 75 000 cubic meters / hour (2650000 CFH). Companies produce these models entirely from metal. Household fans provide ventilation in the small premises. Many modern models have automatic control system with a timer, humidistat, motion sensor, etc. Typically, household fans have plastic body.

Main technical values

This list includes: - power consumption (kW); - full pressure (Pa); - air flow rate (cubic feet / hour); - rotational speed (rpm); - noise level (dB);. - the number of blades; - the number of speeds; - material; - dimensions; - efficiency. Additional features. Modern fans are often equipped with additional functions: - remote control; - backlit; - motion sensor; - night mode; - air ionization; - aromatization with special capsules; - timer; - automatic speed adjustment; - built-in fumigator; - new energy-saving technologies - EC fans and recuperators. High popularity stimulates companies to constantly improve their models using innovative technologies. The invention of Dyson engineers confirms this trend. They invented the world's first bladeless Dyson Air Multiplier fan. Today, Dyson offers the next Dyson Cool generation. This technology works as follows. Energy-efficient brushless motor sucks air. Than, an annular aperture accelerates its movement. Finally, air foil-shaped ramp sucks airflow and and sends it to the desired channel. This process creates and projects powerful, smooth, high velocity airflow. The video perfectly demonstrates this fan. Read the full article