Comfort is not a luxury in the modern world, but it’s a necessity. Whether it is school, hospital, offices, shopping malls, or any other space, the comfort behind that space is an effective complementary mechanism operating behind it, “HVAC” (Heating, Ventilation, and Air Conditioning), but what is AHU in an HVAC system? The air handling unit’s(AHU) working principle is the main and important part of the HVAC system. It supports the movement of air through the building, cleans it, and either heats or cools it based on requirements.
An AHU room is not a metal box that has fans in it, but it’s the reason why it is cleaned, cooled (or heated), and circulates indoor air. Whether it is about temperature control, indoor air quality, or even energy efficiency, the AHU is the main mechanism of how comfortable, healthy, and green a space can be.
In this blog, we are going to unfold what exactly an AHU in HVAC is, how it operates, and why it is necessary for a climate-controlled area.
What Does AHU Mean in HVAC, and How Does it Work?
AHU, full form in HVAC, is the Air Handling Unit is an essential element in the HVAC system. An AHU is like the heart of a building because it circulates air in a building in the same way blood circulates in a body. It draws either fresh air or recycles air indoors, filters it, cools or heats the air, and diverts the air to various rooms via ducts.
Within the AHU are a number of components that cooperate, namely fans, filters, coils, and dampers. The fans are used to circulate the air, the filters clean the dust and other pollutants, the coils cool or warm the air, and the dampers open and close to regulate the quantity of air in and out. In order to understand indoor air quality and comfort, you will have to know what is an AHU in AC. It is the unit that manages and provides the conditioned air to the building. Whether a large space of commerce or a small office, AHUs ensure that the air that people inhale is fresh, safe, and comfortable.
AHU vs HVAC
HVAC stands for Heating, Ventilation, and Air Conditioning, which is the overall system used for the control of the climate indoors. AHU, or Air Handling Unit, is an important component within an HVAC. It assists in circulating, filtering, heating, or cooling the air, being the engine of the HVAC system.
Main Functions of AHUs
Besides controlling the adequate ventilation of the interior air with the exterior air, the AHU accomplishes the following functions with the air handling unit diagram:
- The quality of the air that would be delivered to the interior would be filtered and controlled by the filters of the purifying system of the air, and depending on how long the filters can last, the air would be clean.
- Management of the air temperature that controls the air conditioning system, either cold or hot, to make the thermal feeling in the interior the desired one.
- Monitoring of relative humidity to make the indoors comfortable.
On their part, the places where the AHU is to be used are the ones where the movement of people is too high, crowded places, and where the natural ventilation is minimal, such as hotel dining rooms, offices, restaurants, convention halls, and many other spaces. It also fits well to be used in those places where the demands of hygiene are very high, such as laboratories, hospitals, or operating theatres etc.
Components of An AHU
• Air Intake
The branch in which the external air is suctioned, filtered, and supplied to the living room. They are also able to suck the indoor air, which is recycled.
• Filter
Depending on the purity of air required, the type of air filtration equipment retained will be higher or lower in the retention of particles, viruses, bacteria, odour, and other air pollutants. The filter shall be changed periodically.
• Blower or Fan
This electromechanical device pumps the air in the AHU into the ductwork, and it is dispersed in the rooms.
• Heat Exchangers
Heat exchangers are the parts that enable the transfer of temperature between two liquids (or gases), in the present case, air and coolant, through a solid wall surface.
• Cooling Coil
Air moving through this unit is cooled by the cooling coil. Water droplets may also be formed in the process and may be condensed through a built-in droplet separator, and are then collected in a condensate tray.
• Silencer
This is mainly the coatings that reduce the noise level of the installation significantly.
Find The Perfect AHU System
At the Reagan INC., we know how clean and comfortable air plays an essential role in any space. Having a new or upgrading an old system of HVAC, our experts will help you get the best Air Handling Unit, depending on your budget.
Enquire now to discuss the valuable AHU solutions that we offer and which meet your space, budget, and performance specifications.
Wrap Up
The foundation of any successful HVAC system is the powerful and effective Air Handling Units (AHUs) that have a key role in distributing clean and controlled-temperature air in a building. The air inside an AHU system is also an important factor that can influence the health and comfort of people. The proper combination of ducts, filters, humidifiers, moisture removal systems, etc. facilitates that process. AHUs are convenient to support the quality of the air in places that are not naturally ventilated, such as hospitals, offices, hotels, and congested street segments.
Knowing the workflow of the AHU gives us insight into how it affects the daily comfort and well-being. Understanding what is the meaning of AHU in HVAC helps highlight its critical role in ensuring clean, comfortable, and well-regulated indoor air in any building. Regardless of the purpose (energy efficiency, air cleaning, or a comfortable indoor environment), an AHU is a necessity for any space that intends to be a modern place.
FAQs
What is the purpose of the AHU in HVAC?
Central air conditioning is the main component of the air handling unit (AHU ). It gathers outside air as well as room air, cleans it from dust and other particles in the air taken in, changes the temperature and humidity, and then distributes comfortable and fresh air-conditioned air to the rooms via duct openings.
What are FCU and AHU in HVAC?
In HVAC (Heating, Ventilation, and Air Conditioning) systems, Air Handling Units (AHUs) and Fan Coil Units (FCUs) are very important components that function in totally different ways in terms of handling indoor air quality, temperature, humidity, and comfort.
What are the two types of AHU?
There are two types of air-handling units (AHUs) commonly used for control air in HVAC systems these would be the blow-through and the draw-through AHUs. The blow-through AHU is a fan that blows the air through the mixing box, the cooling coil, and filters, whereas the draw-through AHU pulls the air.
What is CFM in AHU?
Central air conditioning is the main component of the air handling unit (AHU ). It gathers outside air as well as room air, cleans it from dust and other particles in the air taken in, changes the temperature and humidity, and then distributes comfortable and fresh air-conditioned air to the rooms via duct openings.
How to calculate AHU capacity?
To calculate Air Handling Unit (AHU) capacity, you should define the required airflow volume (CFM or L/s) with consideration of such variables as the air volume of the space in which occupants are located, the number of occupants, the load that the air volume is to serve in terms of heating and ventilation requirements, etc.
What is VFD in HVAC?
Variable Frequency Drive (VFD) is an electronic device that manages the speed of electric motors and is commonly applied to fans and pumps in the HVAC systems.
Can AHU work without a chiller?
Yes, an AHU can work without a chiller.
What is the full form of CFM?
Being an acronym, CFM can be defined as Cubic Feet per Minute.