Difficult to make a choice for your new Centrifugal Fan? We wrote this Centrifugal Fan special buying guide to help you, with the TOP10 of the best sales of the moment, tests, opinions… As in all our buying guides, we have done our best to help you choose the best Centrifugal Fan!
Our selection of centrifugal fans
Centrifugal fan buying guide
The Centrifugal Fan is an industrial fan whose new shapes can also be used in offices and apartments. The plurality of models and the diverse characteristics of each of them can complicate the process of purchasing best centrifugal fan. Here is the basics of what you need to know to make the best choice.
What is the difference between centrifugal fan and axial fan?
An axial fan is a type of fan that extracts air and forces it to move parallel to the shaft around which its blades rotate. Centrifugal fans extract air at right angles to the fan inlet and rotate the air outward to the outlet by deflection and by centrifugal force. The blades rotate to draw air and move it perpendicular to the shaft towards the mouth. Axial fans replace the centrifugal fan in some areas of application from a functional point of view, operating at higher speeds while having smaller diameters.
Centrifugal fans have an impeller inside a cylindrical housing, with tight clearance between it and the blades to improve the speed of the air flow. The impeller spins faster than propeller fans, allowing operation at high pressures. The efficiency is up to 65% higher than that of axial fans.
Axial fans are similar to centrifuges, but with the addition of the guide vane that improves pressure by directing and straightening the air flow. These fans are designed for commercial and industrial applications where large volumes of air are required at moderate to high pressures.
Centrifugal fans are generally the most energy efficient fans and should be used whenever possible. Uses include heat removal, smoke removal, drying, comfort and cooling.
Axial fans generally operate at low speed and moderate temperatures. They experience a large change in air flow with small changes in static pressure. They handle large volumes of air at low pressure. They are also most often used indoors as exhaust fans. For outdoor applications, they are combined with condensers.
What uses can be made of a centrifugal fan?
The Centrifugal Fan is a very powerful device that has a turbine that sucks air from a room or space and expels a mass of air purified of waste and dust into it. It can perform both the function of fan that it is recognized, but also that of heating and air conditioning equipment.
Use in industry
In industry, the fan is used:
- At theevacuation of various fine particles (dust, fibers, grains, etc.) from point to point.
- At air treatment by particle extraction of waste (filings, sawdust, etc.), particularly in laboratories or welding workshops, construction sites and smoke extraction sites.
- A suction of moisture of the rooms in which it is installed.
If the industrial use of the centrifugal fan is the best known, its use has gradually become more democratic. Now, there are more and more models intended for homes.
In housing, you can use your Centrifugal Fan for :
- Remove moisture of the apartment and purify the air.
- Cool the room in which it is installed, serving for ventilation, air conditioning and heating.
- Dry to energize your ventilation system due to the fact that it is more powerful than propeller fans.
Each of these uses depends on the type of fan involved.
What are the different types of centrifugal fan?
The centrifugal fans can be classified either according to the force of the pressure or according to the inclination of the blades.
According to the pressure
There are low, high or medium pressure fans.
- A low pressure fan, like a axial fan, can be used to cool a small space. As the pressure is low, in a larger space you won't notice a real difference between this fan and a simple table fan.
- The high pressure fan is the most powerful of fans. If you want to have a Centrifugal Fan apartment, you will need to choose a medium pressure fan. Less noisy than high-pressure fans, and more powerful than axial fans in the apartment, this fan can be used both in apartments and for large areas.
According to the inclination of dawn
Apart from pressure, fans can be classified according to the inclination of their blades or blades. We distinguish in particular:
- The forward inclined vane fans which turn in the same direction as the wheels and which are called Centrifugal Fan to action.
- The centrifugal jet fans which are fans, the blades of which are tilted back. Much more powerful than the others, they have less blades and can run at full power or at varying speeds. They are the most expensive.
- The radial blade fans are the least used. With relatively low efficiency, they are however at high pressure, but are only used in industry.
What are the criteria for choosing a centrifugal fan?
Centrifugal fans are among the ventilation devices and most efficient and versatile airflow movement. The shape of a centrifugal fan causes the air flowing through it to accelerate and change direction at a specific angle (45 °, 90 °, 135 °, 360 °) before exiting the mouth.
Centrifugal fans are quiet and reliable, hence their greater use in the industrial sector. They are designed to provide a constant flow of air regardless of the environment and the application you make of it. To choose one, you must take into account the criteria below.
In relation to power, you should know that the more powerful the fan, the more it will cost you and the more it will require extensive maintenance. If it is to be used in a confined space, high power is not necessary. Along with power, your Centrifugal Fan must make as little noise as possible.
There is a correlation between the noise produced and the power of the fan. Contrary to popular belief, the louder the fan, the less efficient it is. The yield is then lower. On the other hand, you can use a fan that makes more noise if the location where it will be installed is away from the public and if you install a sound absorber in the ventilation duct.
The shape of the fan
The other important point that you must take into account when choosing the best centrifugal fan for your apartment or factory, is the fan size. It must indeed be proportional to the space available where you plan to have it installed. It should be noted that the smaller your fan, the more energy it consumes, but the less it will cost you to purchase. You will then have to make sure to opt for a medium-sized centrifugal fan for average consumption. According to many tests carried out on Centrifugal Fan which will best meet the energy requirements is the action fan.
The type of blades
A centrifugal fan may be different from another in relation to the type of blades fitted to it. There are 4 kinds, each with their own properties and functions.
- Radial blades : A centrifugal fan with radial blades is capable of delivering high pressure at medium air flow. It is one of the best centrifugal fans for industrial applications where the device may be subjected to harsh operating environments such as the presence of dust, gas or humidity in the air.
- Forward curved blades : A forward curved centrifugal fan provides medium pressure and high air flow. It is used in many applications such as supplying clean air to a building or installing a ventilation and exhaust air system.
- Blades curved backwards : A fan with curved blades towards the rear produces high pressure. The air flow is high and highly efficient. The power decreases as the flow increases for better air distribution.
- Aerodynamic or airfoil profile blades : A centrifugal airfoil fan is the most efficient and recommended for applications such as supplying clean air in a poorly ventilated environment.
Air pressure and flow
Before you choose a centrifugal fan, you need to know the pressure required to achieve the desired airflow to pass air through ducts, filters, elbows, or other obstacles in your ventilation system. If you want to use it on a long and complex duct system, you will need more pressure, and therefore more horsepower. Don't forget to also take into account the clogging effect of filters on air flow, as this will influence the pressure and power you will need.
A direct drive, non-belt driven, centrifugal fan is more advisable for a small ventilation system. In addition, it is cheaper to set up and maintain because it consists of few parts. It also offers more efficiency by reducing the loss of power due to the absence of a driving effect (belt).
A belt-driven centrifugal fan, on the other hand, is more flexible. It meets the air flow requirements when the motor is equipped with a variable pitch pulley. It is a system that is fitted to the majority of large centrifugal fans.
The operating environment
A centrifugal fan is made to be used in an environment that may or may not be suitable for it. In this sense, always take into account the environment in which your system is operating before choosing the best centrifugal fan.
- Outdoors Most recommended is to use a direct or belt driven centrifugal fan, with a fully enclosed, fan cooled electric motor (or TEFC in English). This will allow the device to work perfectly despite severe weather.
- Dirty or dusty environment : In this case, it is still advisable to use a direct or belt driven centrifugal fan, with a fully enclosed, fan cooled electric motor. Thus, the device will have a longer lifespan and optimum efficiency.
- Corrosive environment : A high humidity environment is a condition in which a stainless steel centrifugal fan is only recommended. A motor that is also made of stainless steel is a good choice for durability.
- Hazardous environment : we speak of a hazardous environment when the centrifugal fan is in the presence of gas, liquid and other flammable products. In this case you should consider a centrifugal fan with an explosion-proof motor.
The quality of the air is of prime importance as this is the material that will be stirred in the centrifugal fan.
- Fresh air : for clean air, a centrifugal fan with blades curved forward, backward or blades with aerodynamic profile is recommended for better efficiency.
- Slightly dusty air : for this air quality, a centrifugal fan with radial blades is recommended. For very light, non-abrasive dust, a fan with backward curved blades may also operate.
- Heavy and abrasive dust, filings and chips : For this air quality, the type of centrifugal fan required is not important. But the ventilation system must be fitted with a filter.
- Corrosive : Air loaded with corrosive elements like humidity requires a stainless steel centrifugal fan, preferably with a stainless steel motor.
- Combustible dust : if the environment is loaded with combustible dust, opt for a centrifugal fan with radial blades and an explosion-proof motor.
- High temperature : if the air is at a high temperature (less than 120 ° C), it is advisable to use a belt-driven centrifugal fan with steel pulleys that withstand high temperatures. If the thermometer reads over 120 ° C, choose a fan with a cooled motor.
The installation position
According to EUROVENT standard, the mounting position and therefore also the direction of rotation of the impeller for centrifugal fans is defined on the drive side and not on the air inlet side.
Dernière mise à jour : 2020-11-28 02:31:53