In the current age of global warming, extreme temperature conditions have become the new normal. Hot places are becoming hotter and more humid, and cold places are getting cooler and freezing. Under such circumstances, an HVAC (Heating, Ventilating, and Air Conditioning) system for organisations, residential projects, vehicles, and hotels becomes a necessity than a luxury. This article explores the basic functioning of an HVAC system and how air mixing mechanism helps in the effective functioning of the system and bring down maintenance cost and electricity bills.
What is HVAC?
An HVAC system is the backbone of any heating and cooling system in apartments, vehicles, or industrial houses. An HVAC system may be single staged, which throws out only hot air or cold air. It may be zoned, which means only a part of the room would become hot or cool, thereby saving electricity costs. Some HVAC systems are equipped with a humidifier and/dehumidifier to control the humidity in the air.
Air Mixing Mechanism in HVAC
■ Air Mixing Box
The Air Handling Unit in an HVAC system is like its heart that performs various tasks like temperature control, humidifying and dehumidifying, and cleaning and circulating air. The main component in the system is the Air Mixing Box, also known as Plenum, which is installed near the HVAC supply outlet.
■ Process of Mixing
In the Plenum, Outside Air (OA) and Return Air (RA) are mixed until it reaches the accurate temperature to be distributed to the area requiring temperature control. Outside Air (OA) is the hot or cool air that the blower in the HVAC generates and supplies to the Plenum, which then distributes the air to the room. As fresh hot or cool air goes into the room, the existing cool or hot air in the room is drawn back by the air collection box in the Plenum and is known as Return Air (RA). Using a diverter, the Return Air is then directed towards the Outside Air for processing.
■ Air Tight Damper
In order to circulate the air perfectly, the mixing Plenum needs a plate or round-shaped Air Tight Damper, which helps in controlling the volume of airflow and pressure and redirecting the air to the target area. Since a damper is one of the most important elements in a plenum, it must be manufactured with corrosion-resistant metal. Because of its critical role, the size, location and orientation of the damper are extremely important. It’s better to have a damper that satisfies ASHRAE standards and is AMCA certified.
■ Air Mixer
A high-quality air mixer doesn’t allow air stratification due to unmixed air, as its braiders mix air at a consistent speed, thereby eliminating chances of having unmixed air in the Plenum. Air stratification refers to the layering of air due to which much electrical and mechanical energy is wasted to overcome its effect. Estimates say that an average of 20 per cent energy is wasted because of air stratification. Hence, it’s prudent to have an air mixer that has a special control mechanism for heavy mixing while, at the same time, having acoustical media to obstruct noise coming out of the machine.
About EBair Control
EBair is a Canada based high-quality HVAC manufacturer and distributor. Within 27 years, EBair has marked its presence in Canada, USA, Hongkong, China, Israel, and India, and consistently admired for executing high-end projects of high quality and performance. EBair products are energy efficient and sustainable with optimum water consumption technology. All products are designed and modelled using internationally-certified 3D and 2D schematics and go through multiple checks and approval process to make sure the final products are flawless and therefore deliver long-lasting indoor air quality and comfort. With valuable associates like Kodak, Bell, Honda, IBM, Toyota, Siemens, Honeywell, and many others, EBair’s products are rated as one of the best quality products available globally.