How do Variable Air Volume or VAV Boxes Work?

June 14, 2016 5:54 am Published by

Variable Air Volume box manufacturers create the products with the intent to make them as energy efficient and effective as possible. There are different kinds of VAV boxes, but just like a jet nozzle, they all have the same function: to fill building zones with hot and cold air as per the needs of people. Variable air volume boxes are usually used in commercial buildings and spaces where the HVAC system can attend to the needs of separated areas as per individual requirements.

Thermostat and Controls:

A VAV box generally contains a damper and controls that are connected to a thermostat. Some VAV boxes also have a heat device in the form of an electric coil. Depending on local needs the heat coil will activate when the room temperature drops too low below the acceptable range. This range is determined by engineers in order to prevent misuse of the thermostat which can result in failure of the HVAC system.

Air Handlers:

The VAV box is connected to a large air handler via ductwork. Variable air volume box manufacturers need to ensure that the air handler in question is capable of providing different amount of air to the VAV box in accordance with its needs. If the VAV box is in air conditioning and cooling mode it requires much more air than when it is in heating mode. The amount of air entering the VAV box is regulated by air dampers that open when more air is required, and close to form a smaller opening when less is required.

The main advantage of a VAV box is that it provides zoning capabilities which are commonly used for commercial and office spaces. Although it is different from residential HVAC systems, VAV boxes and systems are effective at providing a comfortable environment for people.

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This post was written by KAD Air Conditioning

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