MECHANICAL Electrical Instrumentation & Control Chemical Engineering Service & Maintenance HVAC(Heating, Ventilation, and Air Conditioning) Air Handling Unit Product Description: HI AIR KOREA (HAK) Air Handling Unit is designed to optimally operate in the harsh conditions of nuclear power plants. HAK Air Handling Unit is specifically constructed to operate in NPPs considering size, efficiency, reliability, and maintainability. The unit is developed in close cooperation with major customers to meet the most demanding requirements. Specification: • Casing - Double-skinned panels made of 0.8 mm thickness galvanized steel internal wall and 3.2~4.5 mm thickness SS400 external wall with 25 mm thick glass wool insulation - Each section shall have sufficient strength to meet the specified design loading including seismic acceleration, and access panels are provided where required for assembly or maintenance - Casing design pressure is at least 1.25 times the fan shutoff pressure per the requirements of ASME N509 • Base Frame - The base frame is made of carbon steel - Rigid enough to support all components during shipping, lifting and operation - Spaces between the frame are also considered for installation of drain pipe • Fan - Both centrifugal & vane-axial type fans are designed, constructed and tested in accordance wi th ASME AG-1 · Centrifugal type - Material of casing and impeller is SS400 - The centrifugal fan shall be of double-width doubleinlet(DWDI) and non-overloading type - V-belt driven, complete with fan belt guard - The blade of the centrifugal fan shall be of backwardinclined airfoil or backward-curved type · Vane-axial type - Casing material is SS400 and blades material is aluminum alloy - Each Vane-axial fan rotor blade shall be manually adjustable type, fixed in position • Motor - Premium efficiency - Cast iron casing - IP54/55 protection - Power supply: 480 VAC, 60Hz, 3-phase - Service factor: 1.15(for TEFC), 1.0(for TEAO) - Enclosure: TEFC type(IC 411) for centrifugal fans and TEAO type(IC 417) for vane-axial fans - NEMA design letter: B • Damper - Damper is designed, fabricated, and tested in accordance with ASME AG-1 and AMCA 500D - Dampers are manual isolation dampers with parallel blades • Cooling Coil - Chilled water coils are designed, constructed and tested in accordance with ASME AG-1 - Copper tube with aluminum fins - Cooling medium: HFC refrigerant(R-407C) or chilled water - AHRI certified(Only chilled water coil) • Heating Coil - Stainless steel tube and fins - Heating medium: Electric • Filter - Standard of width 24 inches x height 24 inches x depth 11-1/2 inches, and rated for a minimum 2,000 cfm airflow per filter with a clean pressure drop not to exceed 0.65 inches of water for 90~95 % efficiency - Frames are designed to withstand the operating pressure - A temporary filter (at least 80~89 % dust spot efficiency on atmospheric dust with 2,000 cfm when tested in accordance with ASHRAE 52.1) is provided - Filters are UL 900 classified 044 MECHANICAL
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