What is Air Handling Unit?

What is an air handling unit, is a question asked by many. The air handling unit is the name given to the tools that can perform different filtering and preparation processes of the air that will enter the environment. If we make another definition, they are devices that allow the fresh air taken from the atmosphere to be sent to the area after different conditioning.

The working principle of the air handling unit is to provide clean air to the area it is in, to adjust the temperature and humidity, and to purify it from dust and particles in the air. So it actually carries the air cleaner format. It completely cleans the air it breathes and ensures that the necessary values are created and transferred to the environment when it comes to the form of function that should be.

Air handling units can keep the humidity and temperature of the indoor air constant under desired conditions. Accordingly, people can get the comfort they want. However, another positive feature is that it constantly cleans the air in the environment where it is used by keeping the solid particles, gases or microorganisms in the fresh air it receives from the outside environment.
What are the Air Handling Unit Types?

Air handling units operate with 4 known thermodynamic air conditioning functions. These;

1 - Heating

2 - Cooling

3 - Dehumidification

4 - Humidification


It is in the form. Air handling units differ according to their usage areas or purposes.


Mixed Air Handling Unit

The air handling unit, which is a mixed air air handling unit, can mix the air in the exhaust air with the fresh air at the desired rate. If the exhaust air has almost the same amount of oxygen as the air in the outside environment, the exhaust air can be mixed with fresh air and the fresh air damper can be throttled. But this system should not be used for hospitals or pharmaceutical factories. It should also not be used in kitchens and places where exhaust air may be polluted.
Heat Recovery Air Handling Unit

The air handling unit, which is a heat recovery air handling unit, performs the process of transferring energies to each other in the heat recovery cell as a result of mixing the air with the exhaust air. It is the air handling unit that can regulate the air in this way. It has been determined that it makes an efficient energy gain of up to 70%.
Fresh Air Plant System

The air handling unit, which is a fresh air central system, is the air handling unit that transfers the air it receives from the atmosphere to the area where it is located. The exhaust process is provided with the help of cellular aspirators.
Hygienic Air Handling Unit

The air handling unit, which is a hygienic air handling unit, is a type of air handling unit used for ventilation of environments. Among the types of air handling units, this is the system that needs the most attention. Particles and microorganisms should never enter the system in hygienic air handling units. In addition, care should be taken to prevent the formation of microorganisms in the air handling unit. For hygienic air handling unit use, the humidity should be low and water should not accumulate. It is necessary to be sure that the materials used will not produce microorganisms. Attention should be paid to its cleanliness and maintenance. In the usage areas, there are areas where hygiene is important such as indoor pools and SPA. Additionally;

- Operating Rooms

- Pharmaceutical production facilities

- Laboratories

- Museums

- Food production facilities


It is in the areas where it is used the most.
Comfort Air Handling Units

Air handling units, which are air handling units for comfort purposes, have been developed according to the fresh air needs in the living area. There are pool dehumidification units and shelter ventilation units in the usage areas of comfort conditioning units.
Industrial Air Handling Units

Air handling units, which are industrial air handling units, are useful in creating suitable weather conditions for the products produced in seconds. It refreshes the air in the space and adjusts it according to the capacity of need. Usage areas;

1- Paper production and usage facilities

2- Textile production facilities

3- Ceramic production facilities

4- Petrochemical plants

5- Chiller cooling projects


How Does the Air Handling Unit Work?

How the air handling unit works, the working principles are different for each system. In general, in many systems;

1- Damper motor

2- Filter

3- Heating or cooling unit

4- Fan

5- Aspirator


are available. Parts other than these vary depending on the type of system.

The aspirator is in charge of the air to be taken from outside. The fan, on the other hand, ensures that the air to be expelled inside is expelled. In order for the air handling unit to work, fresh air must be supplied with the help of dampers. The operating principle of the air handling unit varies according to the type. In general, fresh air passes through various sections and the desired air is given to the environment.
What are Air Handling Unit Sections?

Air handling unit sections vary according to the type of air handling unit. Technical and physical properties should be known. Each separate carries moisture.

The section called the "mixing room" provides the mixing of the air at different values and turning it into the desired air. It creates energy savings. It is a multi-purpose piece.

The dust filter is used to clean the air. There are three types of HEPA filters, bag filters and panel filters.

It has pre-heater and cooler sections. This section gains great importance in winter and summer months. It has a role in the water and humidity setting used.

The humidifier section is the section responsible for the adjustment balance of the humidity. In case of need, it uses spray, water or steam humidification options.

The drip holder section is the area that prevents the mixing of the water escaping from the humidifier with the outlet air.

The after heater section ensures that the specific humidity remains stable regardless of the season.

The fan section, that is, the ventilator or the aspirator, absorbs the air. There are three types as volute, axial and perpendicular flow.