Air Handling Unit (AHU)

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Air Handling Unit (AHU) Selection Tips :

Air Handling Units, represented by AHU in project equipment specification tables, are integral parts of air supply systems with control over temperature and humidity for application in both cold and hot seasons. The Air Handling Unit (AHU) is an essential part of air conditioning systems and can be used in all climates in Iran.

  • An Air Handling Unit (AHU) is often used to adjust temperature and humidity and supply conditioned air to halls, venues, hospitals, offices, and other large spaces and is superior to a fan coil system—in particular, in humid regions—as, besides the better quality of the output air, installing fan coil units requires laying an extensive network of supply, return, and drain pipes which are prone to rusting due to the moisture in the soil, whereas the ducts to supplement an AHU—that are often implemented in the drop ceiling—have a much longer service life.
  • Generally speaking, an Air Handling Unit (AHU) mixes the return air from the building with fresh air, passing them through an initial aluminum filter. In the summer, the air is cooled than by passing through the fins of a cooling coil (or a heat exchanger), whereas it is heated in the winter by running through hot water (or vapor) coil. The conditioned air is then directed to the rooms through the duct system. Further, when the need arises, the supply air can be humidified by water or vapor in the unit, before entering the cooling or heating coil and distribution via the duct system.
  • Air handling units often consist of: The structure, the frame, fan, electric motor, air filters, cooling and heating coils, humidification nozzles, input, output, and return air dampers, and control equipment.
    ahu

Before selecting and placing an order for building an air handling unit, determine the following :

  1. The use of the space to which the unit will supply
  2. The required cooling and heating in the building
  3. Horizontal or vertical unit
  4. The capacity of the unit (in CFM or m3...

Air Handling Unit (AHU) Selection Tips :

Air Handling Units, represented by AHU in project equipment specification tables, are integral parts of air supply systems with control over temperature and humidity for application in both cold and hot seasons. The Air Handling Unit (AHU) is an essential part of air conditioning systems and can be used in all climates in Iran.

  • An Air Handling Unit (AHU) is often used to adjust temperature and humidity and supply conditioned air to halls, venues, hospitals, offices, and other large spaces and is superior to a fan coil system—in particular, in humid regions—as, besides the better quality of the output air, installing fan coil units requires laying an extensive network of supply, return, and drain pipes which are prone to rusting due to the moisture in the soil, whereas the ducts to supplement an AHU—that are often implemented in the drop ceiling—have a much longer service life.
  • Generally speaking, an Air Handling Unit (AHU) mixes the return air from the building with fresh air, passing them through an initial aluminum filter. In the summer, the air is cooled than by passing through the fins of a cooling coil (or a heat exchanger), whereas it is heated in the winter by running through hot water (or vapor) coil. The conditioned air is then directed to the rooms through the duct system. Further, when the need arises, the supply air can be humidified by water or vapor in the unit, before entering the cooling or heating coil and distribution via the duct system.
  • Air handling units often consist of: The structure, the frame, fan, electric motor, air filters, cooling and heating coils, humidification nozzles, input, output, and return air dampers, and control equipment.
    ahu

Before selecting and placing an order for building an air handling unit, determine the following :

  1. The use of the space to which the unit will supply
  2. The required cooling and heating in the building
  3. Horizontal or vertical unit
  4. The capacity of the unit (in CFM or m3/hr) and the amount of return air
  5. Horizontal or vertical air supply
  6. Dimensions and the placement of the unit
  7. The number of rows, diameter, material, and thermal surface area of the cooling and heating coils
  8. Determining the type of and pressure drop in the hot working fluid (hot water or vapor) in the heating coil
  9. Determining the type and the pressure drop in the cold working fluid (chilled water or refrigerant) in the cooling coil
  10. The number of heat exchange fins per square inch of the cooling and heating coil
  11. The static pressure of the centrifugal fan of the unit to overcome the pressure drop across the longest supply duct
  12. The number and type of air purification filters

Notice: Air handling units that directly use a refrigerant for cooling instead of cold water supplied by a chiller system are referred to as air handling units with DX coil.

ahu

  • Given the significance of air quality in certain places, such as the electronics industry, food industry, pharmaceutical industry, operating rooms, hospitals, and others, using hygienic air handling units is recommended for supplying sterile air. These units have special capabilities including noise-absorbing cabins (nickel–chromium alloy), coupling with an air recovery system, HEPA filters, and UV lamps.
  • In hygienic air handling units, 100% of the fresh air passes through the wire mesh and bag filters—that absorb up to 95% of particulates—and then a HEPA filter—that absorbs small particulates with diameters down to 0.3 microns. Further, in a super-hygienic air handling unit, the input air enters a sterile environment after passing through an Ulpa filter—that absorbs particulates as small as 0.12 microns—thus providing a high level of filtration.
  • Given the important role of the coil in air handling units, when placing an order for a unit, note the number of rows, thermal surface area, and the number of fins per square inch of heating and cooling coils, as well as the diameter and thickness of the coil, and the frame and its constituting sheets. For further information on the selection of an air handling unit, contact our specialists at DamaTajhiz.
  • Whether the unit comes with a humidification system.

Control over the temperature in air handling units is provided by one of three methods :

First Method

An electrical or motorized three-way valve is fixed on supply or return pipe of chilled/heated water coil as in switched on/off by a thermostat fixed in the return duct. Chilled/heated water flow is switched on/off or regulated in order to adjust temperature of the environment.

Second Method

The speed of the motor and fan of the air handling unit (AHU) is adjusted by a thermostat installed in the room or in the hallway or other suitable places (similar to the case with fan coil units). The control system must be designed to allow the duct thermostat and three-way valve to operate first and then, if necessary, let the room thermostat control the fan speed.

Third Method

Controlling the AHU capacity by a motor-driven, fresh input and return air damper that determines the mixing ratio of fresh and return air.

installing a flow switch on the evaporator output path (chilled water) to the cooling coil of the heat exchange equipment (including fan coil and air handling units) for commanding the chiller to stop when circulator pumps in the refrigeration circuit shut down.

When installing the Air Handling Unit (AHU) note that :

  • Large scale units are difficult to transport due to their dimensions, as a result, they are transported in separate parts and then assembled during installation.
  • Air handling units that are made of galvanized steel sheets can have either a horizontal or vertical configuration depending on the installation conditions. Air handling units are designed and produced in single-zone and multi-zone models. In the single-zone type, all parts of the building that are covered by the AHU are supplied with air at the same temperature and humidity, whereas multi-zone models draw on special dampers to provide air under different temperature and humidity conditions.
  • The specifications of the foundation atop which the Air Handling Unit (AHU) sits depends on the structural conditions of the project and the weight and dimensions of the equipment.
  • According to engineering standards, after installation, a space as large as 1.5 times the width of the equipment must remain empty on one side to allow for the replacement of the coils when the need arises during the long service time of the unit.
  • It is necessary to place a drain in the Air Handling Unit (AHU) room for periodic cleaning and maintenance.
  • To improve and maintain the efficiency of the unit, it is important to properly insulate the equipment, in particular, the ducts running outdoors that are exposed to sunlight or cold air.

Placing an Order and Warranties for Building an Air Handling Unit (AHU) :

  • Offering best price guarantee for all products, the prices for Air Handling Units presented by DamaTajhiz are up-to-date and discount-included (see Best Price Guarantee at DamaTajhiz.com).

  • Find the technical information you need for comparison and purchase for several models of Air Handling Units from reliable manufacturers at DamaTajhiz.com, under Air Handling Units category.

Air Handling Unit (AHU)

Speed is our motto and your profits is our priority


1M3 =35.315 Ft.3
1K Cal =4 BTU

1 Atm =14.7 PSI
1 GPM X 0.2271 = 1M3/hr

1200 BTU = 1 Ton of Ref.
1M3/hr =0.588 CFM

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Short Introdution

Since 2003, DamaTajhiz Online Store has been active in the supply of all types of heating, ventilation, and air conditioning (HVAC) equipment by management of Mr. Majid Zavvarian to meet needs of construction projects and consumers in the Middle East.

Investigating new methods of e-commerce and looking ahead to the future, DamaTajhiz Online Store designed its way of success as the first startup for selling installation equipment in Iran and the Middle East in 2004 by launching the most comprehensive specialized shopping website for all types of heating, ventilation, and air conditioning (HVAC), pool, sauna, and spa bath equipment.


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