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Aircoil™ Evaporators: AS
Overview ·
Construction Features & Options ·
Selection ·
Engineering Data ·
Engineering Applications ·
Nomenclature ·
Application Guide ·
Installation, Operation and Maintenance
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 AS Aircoil™ Evaporators
Small to Medium Industrial Applications (2 - 31 ammonia tons)
Coil Design
Coils are designed and manufactured according to the stringent requirements of ASME B31.5 (2001), which now addresses heat transfer component design. All coils are pressure tested to 350 psig with air under water. Units are shipped with a nitrogen holding charge.
Tubes
BAC Aircoil™ Evaporators are constructed with 0.875” diameter stainless steel, aluminum, or galvanized steel tubes, staggered in the direction of airflow to ensure maximum air turbulence and coil heat transfer efficiency.
Fins
Die-formed, flat pattern fins are a continuous design with a clean full collar to optimize performance, resistance to airflow, and cleanability. The flat pattern also reduces resistance to airflow, providing performance comparable to corrugated fins at a given horsepower.
Circuiting
Each coil is individually circuited for specific applications in recirculated, flooded, direct expansion, or control pressure receiver refrigeration systems along with water, glycols, or brines.
Tube Frame
The coil incorporates a heavy-duty rectangular structural tube frame, which improves rigidity, squareness, and long-term stability, rather than a less robust angle design. The tube frame also improves cleanability by reducing cavities and it encloses and protects BAC supplied wiring options.
Header
Headers are constructed of schedule 80 or schedule 40 pipe as required by ASME B31.5.*
* Does not apply to coils of copper tube construction.
Casing
Casings are constructed of durable,
corrosion resistant G-235 (Z700 metric) galvanized
steel with 2.35 oz/ft2 zinc coating (700 g/m2). Load
carrying components are engineered with reinforcing
panel breaks and hardware particularly suited for the
application. Fans are individually compartmented with
continuous tube sheets to permit fan cycling.
Hangers
Heavy-duty support hangars are engineered with rigging
points to permit safe and easy hanging.
Hinged Fan Panel
Fan orifice panels are constructed with
smooth, large radius orifices. Fan panels are hinged
to permit unrestricted access to both faces of the tube
bundle, for maintenance and cleaning.
Drain Pan
Inner drain pans are constructed
of heavy-gauge welded aluminum for corrosion resistance,
light weight, and good heat conductance for
pan defrost.
All pans are furnished with an extra large drain connection,
when coupled with the flatness and smoothness
of the sloped aluminum pan, permits swift and
total drainage.
Fans
BAC has optimized the fan proximity to the coil face,
fan positioning within the tapered fan orifice, and the
coil aspect ratio to maximize performance of selected
fans.
Direct-drive fans with contoured aluminum
blades are selected and installed to maximize performance
and efficiency. Fan motors are basket-mounted
in a heavy gauge, PVC-coated steel fan guard.
Wiring
Motors are pre-wired to a common nonfused
disconnect, as standard. Flexible conduit from
the motor to the air unit frame permits opening of the
hinged fan panel on AS and AM units. Wiring is run
through the structural tube frame and terminated in a
factory mounted NEMA-4 enclosure.
Motors
Motors are a totally enclosed air over (TEAO), furnished
with low temperature grease and are otherwise
designed to ensure reliability and longevity in a harsh environment
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