Air Handling Equipments Used in HVAC - Different Types of Fans in Ventilation

 

Air Handling Equipments Used in HVAC

In this post we are going to present some information which will direct the engineer in the pragmatic utilization of fans utilized in air Conditioning frameworks. A fan is a gadget used to deliver a progression of air. Utilization of the term is restricted by definition to gadgets delivering pressure differentials of under 28 in. wg at sea level.

Diffferent Types of Fans:

        Fans are distinguished by two general categories:

The first one is Centrifugal, in which the wind flows radially through the impeller. Centrifugal fans are further classified based on their wheel blading ; Forward curved type centrifugal fans, Backward curved type centrifugal fans, and Radial type of centrifugal fans (straight).

The second type of fans are Axial flow fans, in which the wind flows axially through the impeller. Axial flow fans are further categorized as propeller type (disc), tube-axial type and vane-axial type.

What are the Applications of Fans?

        At the point when a Ducted type of system is required in a cooling application, a tube-axial type, or a vane-axial type or a centrifugal type of fan may be utilized. Where there is no Ducted type of system and little protection from wind current, a propeller fan can be applied. But, self - contained appartus frequently uses Centrifugal fans for applications without ducting work. The Centrifugal fans are utilized in most solace applications in view of its wide scope of quietness, proficient operations at nearly high pressures. Moreover, the Centrifugal fan inlet can be promptly connected to a device of enormous cross -section area, while the release is effectively associated with somewhat little ducts. Wind flow can be changed to match air distribution network necessities, by basic acclimations to the fan drive or control gadgets.

            Axial flow fans are great for huge air volume applications where higher commotion levels are of optional. They are, in this manner, frequently utilized for modern air conditioning and ventilation. These high speed fans require guide vanes to get the best efficiencies when activity against pressures considered typical for Centrifugal fans . Be that as it may, these fans might be applied without guide vanes.

Centrifugal type of Fans:

            Centrifugal fans utilize rotational force to move air through blades attached to a rotating shaft. They are much quieter than conventional fans and can handle high pressures without causing noise or vibration.Centrifugal fans are used to cool and heat rooms, and they work best at higher speeds. Their low-pitch design allows them to spin at a lower RPM (rotations per minute) compared to other types of fans. This keeps them quiet, efficient, and powerful.

            Centrifugal type of fans are distinguished by the arch of the sharp edge tip. The forward curved blade type has bended sharp edge that bends in the direction of turn. The Radial type has no curvature. The Backward curved blade type has bended sharp cutting edge tip that leans in reverse, bending away from the direction of rotation.

Look for centrifugal fans in HVAC systems. In older homes, they were sometimes built into the ductwork but this isn't common practice anymore. Newer homes often have these units installed directly outside the return vents. If you find them, check your utility bill to make sure they aren't being used incorrectly. They require voltage from a power supply and won't operate properly if not connected.

Radial Blade type of Fans:

        The radial blade type of fan has effectiveness, speed and limit qualities that are halfway between the forward-bended and in reverse bended sharp edge fans. It is rarely utilized in cooling applications since it misses the mark on ideal trademark.

Axial Flow type of Fans:

The purpose of axial flow fans is to move air from a low pressure area to a high-pressure area. In our case this means moving hot, stale air out of your home or office, and replacing it with fresh, cooler air. Axial fans are used in ventilation systems, heating/cooling applications, and other applications that require forced airflow.

        Invented in 1885, the term “axial fan” was used by the Chinese to describe the motion of water flowing through a riverbed. Since then, the term has been adapted to the field of mechanical engineering. An axial fan works based on the principle of centrifugal force, where air is moved outward in a circular pattern, creating a continuous stream of air.

            The tube-axial type of fan is a typical axial flow type of fan in a rounded lodging yet without inlet guide vanes. The cutting edge shape might be level or bended, of single or twofold thickness. The axial flow type of fan has become especially related with the vane-axial type which has guide vanes previously or after the fan wheel. To utilize the guide vanes, the fan wheel for the most part has bended cutting edges of single or twofold thickness.

            Well, these are some basic types of fans that are used in HVAC. 

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