AHU
Description
• Equipment that warms and cools the ambient air by controlling temperature and humidity and meets the need for fresh and clean air is known as “air handling unit”. In short, they are air conditioning and air cleaning units. To conditioning; We can define heating, cooling, dehumidification and humidification functions as performing. These are the units that keep the temperature and humidity of the air in a closed space constant and to be cleaned at the desired values, at the same time, can meet the fresh air need of the space and exhaust the exhaust air.
Air handling units according to their intended use;
• Comfort air handling units
• Industrial air handling units
• Hygienic type air handling units
• Other… .. (Dehumidification, process etc.)
Air handling units by construction;
• 100% Fresh Air
• Heat Recovery
• Mix Air
• Ceiling Type
Air handling units are operated as a whole by combining the designed modules (cells) according to the intended use and the features expected from it.
(100% Fresh Air) Air Handling Unit
(Heat Recovery) Air Handling Unit
(Mix Air) Air Handling Unit
(Ceiling Type) Air Handling Unit
The air speed that passes through the lamella surface of the coils is ideally;
• Heater Coils can be taken between 3 – 4 m/s.
• Water Cooling Coils can be selected between 2,2 – 3,0 m/s.
• DX Coils can be selected between 2,2 – 2,7 m/s.
AIR HANDLING UNIT SECTION MODULES
Air Inlet & Mixing Section
• All of the damper casing and blades at the air inlet section are manufactured from extruded aluminum profile.
• Air dampers are auxiliary equipment that cause, close or partially open air passage.
• Opposed blades of the damper have aeorodynamic structure in order to reduce the friction resistance of air.
• Damper blade mechanism is from high resistant plastic gear wheels.
• Damper can be controlled manually or with servomotor.
• Standard damper is out of the section as seen on the figure, but on customer demand, it can be also manufactured inside the section.
• Dampers can be controlled manually or with modulating servomotors.
• The required fresh air and ambient air mixture are provided homogeneously at the mixing section.
Filter Section
• Filters have sled or casing construction that allows them to be attached or removed easily to the air handling units through inspection doors.
• The surface that filters going to be fit has a gasket that provides airtightness. Filter cassettes are seated on these gaskets.
• Holes, that are required to connect the manometer which measures the differential pressure of the filter group, are being opened at the factory.
• Differential pressure switches can be mounted to the section on customer demand.
PANEL FILTER
• Filtering at air handling units starts with rough filters (G3 or G4 class).
• Standard filter dimensions like 592x592x48 mm, 287x592x48 mm, and 287x287x48 mm are being used.
COMPACT FILTER
• Compact filters are manufactured from F7-F8-F9 efficient fiberglass material.
• These filters are ideal for high air flow rates and durable for a long time. They are used for precise filtering at high efficient filtration systems.
BAG FILTER
• Bag filters are manufactured from M5-M6-F7-F8 efficient synthetic fiber material. Manufactured with galvanized or plastic frame.
• They are used after pre-filter at high efficient filtration systems for precise filtering.
SPECIFIC FILTERS
HEPA FILTER
• Hepa filters are manufactured from H11-H12-H13-H14 efficient, high-quality fiberglass material.
• They are used at cleanroom applications and at supply and exhaust ventilation systems of pharmaceutical and nuclear facilities.
• Filters have special, impermeable frame construction which can be attached or removed easily through inspection doors.
• Differential pressure switches can be mounted to the section on customer demand.
METALLIC CASSETTE FILTER
• Metal filters, which are washable, have high oil molecules and dust holding capacity.
• They can work in extremely humid environments and high temperatures.
• In air filtration of corrosive environments; they are used for keeping grease and sparks, and for separating oil vapors.
• The oil accumulated with the drain pan under the metal filter is discharged from the power plant.
CARBON FILTER
• Active carbon filters are used at air handling units for absorbing odors at ventilation systems.
• Thanks to its active carbon granule-filled cartridges, carbon filters provide high efficiency at a high flow rate in small sizes.
• According to requirement cartridge amount can be increased by using 4,
8 or 16 holed plates.
• Filters can be removed or attached to the casing easily by twisting and the
casing has impermeable construction.
• Differential pressure switches can be mounted to the section on customer demand.
ELECTROSTATIC FILTER
• The duty of this filter; the negative ions produced by mixing and collecting electron and air molecules together, with the energy field formed by high voltage, is to apply an electrostatic charge to the smoke and soot particles by separating the particles from the exhaust gases by means of electrodes emitted from the cathode section.
• The negative electrostatic field created by the power source keeps the negatively charged anode in the section, leaving the separated exhaust gas cleared outside.
COIL SECTION
HEATING COIL
• Standard heating coils are from the copper coil and aluminum lamellas, with galvanized sheet frame and steel collector.
• 3/8”, 1/2”, and 5/8” diameter copper coils are inflated mechanically and tight contact with lamellas are ensured.
• Coil mouths are extended out of the body and the impermeability is provided with rubber gasket.
• Coils have air relief cock for discharging.
• Coils are mounted on sleds in order to be removed from the side of the air handling unit after the side panel is dismantled.
• Our standard coil selection principles are; maximum 3.5 m/s air velocity on
the surface of coil, minimum 2,1 mm pitch gap, maximum 25 kPa water pressure loss.
• Selection is made under the control of selection software in accordance with these principles.
• Temperature sensor can be mounted to the section for automation, on customer demand.
STEAM COIL
• The headers of steam coils are made of carbon steel.
• Tube thickness can be up to 1mm for steam coils produced with copper tubes in high-pressure applications.
• In very high-pressure applications, steel pipes and steel lamellas are applied to the batteries.
• Connections are externally threaded as standard or with flanges on request.
• All headers are provided with vent and drain fittings.
