1 – CASING

ALDAG AKS RW Air Handling Units are EUROVENT certified and tested in accordance with DIN 1946/4:2008, DIN EN ISO 5167 Standard
-According to EN 1886 Standard, maximum deflection for mechanical strength of the casing is compatible with D1 Class, Maximum leakage between -400 Pa and +700 Pa is compatible with L1 Class. Filter By-Pass Leakage is compatible with F9 Class. Thermal conductivity resistance is compatible with T2 Class. Thermal Bridge is compatible with TB1 Class.
-The panels are made of submersion galvanized steel sheets. The outer steel sheets are RAL 9002 polyester powder coated.
-The panels and service doors are double skinned. The external sheet metal thickness is minimum 1 mm and the internal sheet metal thickness is minimum 0,9 mm.
-All the interior surfaces of the casing is suitable for washing and cleaning and completely smooth without any welding at the joints.
-60 mm rockwool insulation is used between the inner and the outer steel sheets of the panels.
-Mounting and dismounting the panels are handled totally externally.
-The air handling unit cells are connected externally by mechanical fasteners.
-On the casing of the air handling units are lebels which include the technical specifications of the unit. In addition, on each cell casing, there is an identification label which is long lasting and resistant to humidity and water.
-In case air handling unit cells are partially delivered to the installation place, in order to provide easy and accurate onsite assembly, another identification label is placed on each cell which includes the information of cell name and cell number.

2 – SUPPLY FAN - EXHAUST FAN CELLS

AHU units are equipped with double inlet forward curved or double inlet backward curved energy efficient centrifugal fans and plug fans. The fan type is selected according to the air flow, pressure and efficiency curves. The centrifugal fans and plug fans are selected within energy efficiency range 60% and 80%. The fan base is specially determined to increase the lifetime of the fan bearing. In case the total pressure is over 1000 Pascal, it is recommended to use double inlet backward curved fans. The fan speed is selected compatible with the motor speed. The fan- motor group is fastened on the base so as to enable belt tensioning arrangement. The fan- motor group is fastened to the main casing with the rubber vibration elements which prevent floor vibration problems. The belt - pulley system transmits the power from motor to the fan. The fan bearings are easily removed and replaced. The electric motors are IP55, IE2-IE3-IE4, 380 Volt 50 Hz. The electric motor power is selected so as to be 15% or 20% more than fan shaft power. The fan outlet is connected flexibly to the cell so that no vibration is transmitted to the casing or duct. The position of fan inlet and fan outlet can be changed upon request. The plug fans are direct coupled to the motor. Depending on the pressure, the desired fan speed can be arranged by motor drivers.

3 - MIXING BOX CELL

Mixing Box Cell consists of 3 dampers. Some stale indoor air is exhausted through the exhaust damper on this cell and same amount of fresh air is supplied through the other damper. The fresh air is mixed with the stale indoor air and the conditioned air is supplied to the location. The amounts of the stale indoor air and fresh air to be mixed can be arranged at the desired rate using damper motor. The dampers have aluminium aerodynamic blades.
Damper blades are equipped with plastic seals to assure tightness.

4- FILTER CELL

Filter cell is consist of according to filter type, filter type should be panel filter, bag filter, compact filter, carbon filter, hepa filter, electrostatic filter and nuclear filter. The filters are easily removable from the frames. It covers the whole cross sectional area of the cell.

5 - HEAT RECOVERY CELL

100% fresh air is used. Heat recovery cells are determined according to type of the heat exchanger as rotary heat exchanger or recuperator. The sorption rotor in the air handling unit substantially reduces the need for humidification in winter conditions and dehumidification in summer conditions by sensible and latent heat transfer.

Thus, it provides significant saving in energy consumption during all four seasons. The efficiency rate is between 70% and 85%. Special heat recovery cell applications can also be made using rotary heat exchangers which makes only sensible heat transfer.

6 - HEATING – COOLING CELL

The heating coil and cooling coil is determined according to the type of the fluid used in the system. The heating – cooling cell can be equipped with cold-hot-overheated water coil, steam coil, direct expansion (DX) coil or electric heater. The coils are copper tube aluminium finned. The aluminium fins are fastened on the copper tubes by mechanical expansion method. Thus, maximum thermal efficiency is achieved.

The cross sectional area of the cell is determined according to the air velocity over the coil. The average air velocity is around 2,5-3 m/s. For the cooling coils, the condensed water is collected and discharged through the stainless steel epoxy coated and insulated drain pan. If the air velocity is over 3 m/s, the heating-cooling cell is also equipped with aluminium or PVC eliminators.

7 - HUMIDIFIER CELL

If air humidification is requested, air handling units can also be equipped with a humidifier cell as an option. The air passing through the AHU is humidified when coming into contact with pulverized water. There is a leakproof water pool under the cell. Water is pumped to the injectors for pulverization. The humidifer cell is equipped with aluminium air diffusers at the air intake which enable uniform air distribution.

PVC eliminators are placed at the cell outlet to prevent water drifting. Optionally, if steam humidifier is requested, the humidifier cell is equipped with a steam generator.

8 - SOUND ATTENUATOR

If requested, the air handling unit can also be equipped with sound attenuator for the supply fan cell and the exhaust fan cell. The sound attenuator cell consists of sound absorbing baffles. The sound absorbing baffle types are different according to air handling units type. Standard sound absorbing baffles are made of galvanized steel panels with rockwool, glasswool and glass fabric coated plate. On the other hand the sound absorbing baffles which used in hygienic air handling units, are made of stainless steel panel with glasswool, rockwool and nonwoven sound attenuator interlining.