Air Handling Unit

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Air Handler Unit

An air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system

Components
The major types of components are described here in approximate order, from the return duct (input to the AHU), through the unit, to the supply duct AHU output

Filters

  • Heating and/or cooling elements
  • Humidifier
  • Mixing chamber
  • Blower/fan
  • Balancing
  • Heat recovery device
  • Controls
  • Vibration isolators

An air handler is usually a large metal box containing a blower, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers. Air handlers usually connect to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the AHU. Sometimes AHUs discharge (supply) and admit (return) air directly to and from the space served without ductwork

Supply air passing through the AHU is filtered and is either heated or cooled, depending on specified duty and the ambient weather conditions. In some buildings, Air Handling Units are used only to supply fresh air for ventilation and extract stale air

For heating or cooling, AHUs may be connected to central plant such as boilers or chillers, receiving hot or chilled water for heat exchange with the incoming air. Alternatively, heating or cooling may be provided by electric heating elements or direct expansion refrigeration units built into the air handler

When AHU systems are used to extract stale air from the building, a controlled proportion of this air may be recirculated to avoid having to condition all supplied air. AHUs can also incorporate heat recovery mechanisms to extract heat from the air being expelled and use it to heat incoming supply air

Air Handling Units vary considerably in size, capacity and complexity, depending on the job they are designed to perform

Air Handling Units Specifications

Frame with constructed with galvanized sheet metal connected with welding and bolts is available as request

Centrifugal fan made of galvanized with Static and dynamic balancing technology

380V/50Hz/3Phases 1400 rpm Electromotor

Coils are made of simple copper tubes or intra-fin with aluminum fins 8 to 14 Fpi producing at 25 bar testing. (Materials can be changed according to customer’s request

One centimeter poly-roll insulation to prevent wasting cold and heat

The type of bearings is pillow block. Size is suitable for high pressure piping systems for grease to be injected from outside

V-type washable aluminum filters

All fan shafts are made of carbon steel

Air washer, fog nozzle, sprayed coil, steam humidifier and spray nozzle are also available as humidification Options

Frame with constructed with galvanized sheet metal connected with welding and bolts is available as request

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