Fans

What are Fans ?

A fan is a machine which is used to create air or rather a flow within a fluid. The fans run when its blades act on the air. A fan can be any revolving vane or vanes used for producing currents of air. Fans produce air flows with high volume and low pressure (although higher than ambient pressure), as opposed to compressors which produce high pressures at a comparatively low volume. A fan blade will often rotate when exposed to an air fluid stream, and devices that take advantage of this, such as anemometers and wind turbines, often have designs similar to that of a fan.

Types of Fans

• Axial flow
• Centrifugal
• Cross- flow fan
• Bladeless Indirect viscious sheer fan

Axial Flow

These are the type of fans that move parallel to shaft around which the blade rotates.There are a variety of places and ways in which these fans are used like small cooling fans for electronics or large fans that are used in wind tunnels. There are various types under this

Table fan

The oscillator is a mechanism that motions the fan from side to side in case of a table fan. The armature axle shaft comes out on both ends of the motor, one end of the shaft is attached to the blade and the other is attached to the oscillator gearbox of the fan. The motor case joins to the gearbox to contain the rotor and stator which are parts of it. The oscillator shaft combines to the weighted base and the gearbox thing. A motor housing covers the oscillator mechanism completely. The blade guard joins to the motor case for safety of the people. The basic elements include fab base, wires, motors, blade guards, motor housing and the staff.

Domestic Extractor Fan

Bathroom extractor fans typically utilize a four inch impeller which is a part of the domestic extractor fan, whilst kitchen extractor fans typically use a six inch impeller as the room itself is often bigger. Axial fans with five inch impellers are also used in larger bathrooms though are much less common. Domestic axial extractor fans are not suitable for duct runs over 3m or 4m, depending on the number of bends in the run, as the increased air pressure in longer pipework inhibits the performance of the fan. They are basically used to remove moistened or stale air from the surroundings.

Electro mechanical Fans

Four-blade designs are the most common when it comes to the electro mechanical fans. Five-blade or six-blade designs are rare. The materials from which the components are made, such as brass, are important factors in fan desirability. Ceiling Fan – Most common form of fan is the ceiling fan that we see attached on the ceilings of our houses and other places. Ceiling fans can be found in both residential and industrial/commercial settings.

Centrifugal

Centrifugal fans blow air at right angles to the intake of the fan, and spin the air outwards to the outlet primarily by the force known as the centrifugal force. The impeller rotates, causing air to enter the fan near the shaft and move perpendicularly from the shaft to the opening in the scroll-shaped fan casing that is provided. A centrifugal fan produces more pressure for a given air volume, and is used where this is desirable such as in leaf blowers, blow dryers, air mattress inflators, inflatable structures, climate control, and various industrial purposes. They are typically quieter than comparable axial fans that are very noisy in nature. It is also called the scroll fan.

Cross Flow Fan

The flow within a cross-flow fan may be broken up into three distinct regions: a vortex region near the fan discharge, called an eccentric vortex, the through-flow region, and a paddling region directly opposite. Both the vortex and paddling regions are dissipative, and as a result, only a portion of the impeller imparts usable work on the flow. The cross-flow fan, or transverse fan, is thus a two-stage partial admission machine. The popularity of the crossflow fan in the HVAC industry comes from its compactness, shape, quiet operation, and ability to provide a high pressure coefficient. Effectively a rectangular fan in terms of inlet and outlet geometry, the diameter readily scales to fit the available space, and the length is adjustable to meet flow rate requirements for the particular application.

Bladeless Indirect Fan Air

Is drawn in and compressed, before being expelled through an annulus, and accelerated over an airfoil lamp in case of a bladeless indirect fan. Inducing and entraining ambient air through viscous shearing, the loop-shaped upper section multiplies the total airflow many times. The high velocity laminar airflow tends to drag ambient air along with it, due to viscous shear. Only around seven percent of the total airflow actually passes through the fan itself.

Top Brands that Sell Fans

Havells

Havells is one of the best and very well known brands for ceiling fans in the Indian market. They have been in the Indian markets for many years now. They are absolutely reliable and have great quality fans at an affordable price as well. If you are looking for a reliable ceiling fan with a good air delivering quality, then Havells is exactly what you need.

Crompton Greaves

Crompton is best known for delivery of good air quality fans that are reliable and have a silent operation as well.Crompton makes a number of electronic appliances for the Indian market but is best known for their fans.

Orient

Orient is also a known when it comes to ceiling fans but is comparatively a newer brand in the market. They try to bring in new technology and experiment with their products. They were the first to come up with BLDC fans which are something new to look out for.

Bajaj

Again Bajaj is a very well known brand and has been in the Indian markets for a while now. They have other appliances in the market for which they are greatly known which is n comparison to the fans. They have reliable and quality products in the market and should definitely be tried.

Usha

Usha is the best for those who want to buy a decent fan which is affordable as well cause there are other fans that are more expensive. Usha provides you with a fan that lasts well.