COMPAC
SPACE VANE AXIAL FAN SYSTEMS
Inlet Flow
Concentrator/Silencer
The inlet
flow concentrator/silencer is computer designed to optimize
aerodynamics and acoustics, offering both aerodynamic and absorptive
insertion losses. The inlet air is gradually accelerated to
the fan's annular velocity without causing turbulence or flow
separation.
The air is uniformly guided at a perpendicular angle to the
fan annulus area. It's central pod is dimensionally matched
to the fan hub, minimizing impact losses at the fan hub.
Various internal flow shaping devices are used to assure uniform
air velocity across all coils and filters. A resonator is provided
at the fan intake, tuned to the fan's blade passage frequency.
The inlet
flow concentrator/silencer can be supplied in various configurations:
• In-line (axial) flow type with one rectangular inlet.
• Radial type with one, two, three or four sided rectangular
inlet(s)
Cross sectional
view of a three sided, radial inlet flow concentrator for a
125,000 cfm capacity vertical downblast system. Its dimensions
are 6' high x 14' long x 14' wide. Cooling coils with drain
pans and filters are mounted onto three sides of the flow concentrator.
The fan is mounted on a roll-out carriage assembly and is located
immediately below the silencer discharge.
Details
of a three-sided radial inlet flow concentrator for a 95,000
cfm capacity fan system integrating multiple flow shaping devices.
The flow concentrator is of an asymmetrical shape and its dimensions
are 8' high x 7' long x 6.5' wide. This special design of the
inlet concentrator results in uniform flow across all filters
and coils, and also achieves uniform loading onto the fan blades.
Construction:
• Welded structural steel tubing and angle frames.
• 18-gauge galvanized steel outer skin.
• 20 to 22 gauge galvanized perforated inside skin (Optional:
Available in 304 stainless steel.)
• A flexible liner with erosion resistant at velocities
up to 6,000 fpm) mat-faced fibreglass insulation.
• The liner is immediately behind the perforated inside
skin.
• Carefully packed fibreglass acoustical fill is behind
it.
Intake side
of an in-line type flow concentrator silencer with 70,000 cfm
capacity. Its dimensions are 6'high x 5'Iong x 8'wide and incorporates
multiple layers of splitters, transition from rectangular to
round cross section for fan connection, and transition pod to
the fan hub. Alternately, a single layer of splitters are provided
where fan sound power levels are low (such as return fan systems).
This design achieves uniform air velocity at the flow concentrator
intake and as such can be placed within three feet of the coils
for draw-through svstems.
Optional:
Packless silencers for those applications where fibreglass filling
is not desirable and cleaning is required; for example, biomedical
systems and high temperature applications. Packless silencers
use perforated inside skin of 304 stainless steel construction
with single or multi-layered screens of 304 stainless steel,
located immidiately behind it. M&I's packless silencers
have been tested to have acoustical performance similar to those
of fibreglass filled silencers.
Figure 6A outlines the measured transmission
loss of various silencers.
Outlet
Regain Attenuator / Compac Space Vane
Axial Fan Systems
